/* ===== CSS Variables & Design System ===== */
html, :root {
  /* Colors - Light Mode (default) */
  --color-primary: #06b6d4;
  --color-primary-dark: #0891b2;
  --color-primary-light: #22d3ee;
  --color-secondary: #0ea5e9;
  --color-accent: #10b981;
  --color-bg: #f0f9ff;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e0f2fe;
  --color-border-light: #f0f9ff;
  --color-shadow: rgba(6, 182, 212, 0.08);
  --color-overlay: rgba(6, 182, 212, 0.85);
  --color-input-bg: #f0f9ff;
  --color-card-hover: rgba(6, 182, 212, 0.04);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow);
  --shadow-xl: 0 20px 25px -5px var(--color-shadow);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Layout */
  --max-width: 1280px;
  --header-height: 4rem;
  --hero-height: 200px;
  --sidebar-width: 280px;
  --feed-width: 600px;
}

/* ===== Reset & Base Styles ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg);
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Theme transition for all elements */
*, *::before, *::after {
  transition: background-color var(--transition-base), 
              border-color var(--transition-base),
              box-shadow var(--transition-base);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary);
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
  transition: all var(--transition-fast);
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ===== Utility Classes ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ===== Button Styles ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  box-shadow: 0 2px 8px rgba(6, 182, 212, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.35);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: white;
}

.btn-download {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-text-primary);
  color: white;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
}

.btn-download:hover {
  background: var(--color-primary);
}

.btn-load-more {
  width: 100%;
  padding: var(--space-lg);
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  margin-top: var(--space-lg);
}

.btn-load-more:hover {
  background: var(--color-bg);
  border-color: var(--color-primary);
}

.btn-post {
  margin-left: auto;
}

/* ===== Mobile Navigation ===== */
.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  color: var(--color-text-secondary);
  background: transparent;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 85%;
  max-width: 320px;
  background: var(--color-surface);
  z-index: 210;
  transform: translateX(-100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav-overlay.active .mobile-nav {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
}

.mobile-nav-close:hover {
  background: var(--color-bg);
  color: var(--color-text-primary);
}

.mobile-nav-content {
  padding: var(--space-md);
}

.mobile-nav-content .nav-item {
  padding: var(--space-md);
  font-size: var(--font-size-base);
}

.mobile-nav-footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.mobile-nav-footer .btn {
  width: 100%;
  margin-bottom: var(--space-sm);
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
  }
  
  .mobile-nav-overlay {
    display: block;
  }
}

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base);
}

.header-content {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  flex-shrink: 0;
}

.logo-content {
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 1.2;
}

.logo-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

.logo-subtitle {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-secondary);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

.search-container {
  position: relative;
  flex: 1;
  max-width: 600px;
}

.search-input {
  width: 100%;
  padding: 0.625rem var(--space-lg);
  padding-left: 2.5rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.search-input::placeholder {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.search-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-left: auto;
}

.notification-btn {
  position: relative;
  padding: var(--space-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
}

.notification-btn:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.notification-badge {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25rem;
  height: 1.25rem;
  padding: 0 0.25rem;
  background: #ef4444;
  color: white;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  height: var(--hero-height);
  background: var(--color-primary);
  overflow: hidden;
}

.hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.92), rgba(14, 165, 233, 0.88));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
  color: white;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  margin-top: var(--space-2xl);
}

.hero-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
  animation: fadeInUp 0.6s ease-out;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  opacity: 0.95;
  animation: fadeInUp 0.6s ease-out 0.2s both;
  line-height: 1.6;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Main Content Layout ===== */
.main-content {
  padding: var(--space-xl) 0;
}

.content-grid {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr var(--sidebar-width);
  gap: var(--space-lg);
  align-items: start;
}

/* ===== Sidebar Left ===== */
.sidebar-left {
  position: sticky;
  top: calc(var(--header-height) + var(--space-lg));
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: 0 1px 3px rgba(6, 182, 212, 0.1);
  border: 1px solid var(--color-border);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 0.75rem var(--space-md);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.nav-item:hover, .nav-item.active {
  background: var(--color-bg);
  color: var(--color-primary);
  transform: translateX(2px);
}

.nav-item.active {
  background: linear-gradient(90deg, var(--color-bg), transparent);
  border-left: 3px solid var(--color-primary);
  padding-left: calc(var(--space-md) - 3px);
}

.nav-item svg {
  flex-shrink: 0;
}

.sidebar-footer {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.sidebar-footer-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  text-align: center;
}

/* ===== Feed ===== */
.feed {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ===== Post Creator ===== */
.post-creator {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 1px 3px rgba(6, 182, 212, 0.1);
  border: 1px solid var(--color-border);
}

.post-creator-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-semibold);
  flex-shrink: 0;
}

.avatar-current {
  background: var(--color-secondary);
}

.avatar-doctor {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.avatar-beauty {
  background: linear-gradient(135deg, #ec4899, #db2777);
}

.avatar-nutrition {
  background: linear-gradient(135deg, #10b981, #059669);
}

.post-input {
  flex: 1;
  padding: 0.75rem var(--space-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.post-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
}

.post-input::placeholder {
  color: var(--color-text-muted);
}

.post-creator-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.post-action-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
}

.post-action-btn:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

/* ===== Post ===== */
.post {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 1px 3px rgba(6, 182, 212, 0.1);
  border: 1px solid var(--color-border);
  animation: fadeIn 0.4s ease-out;
  transition: all var(--transition-base);
}

.post:hover {
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.15);
  transform: translateY(-2px);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.post-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.post-author-info {
  flex: 1;
}

.post-author-name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.post-time {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.post-menu-btn {
  padding: var(--space-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
}

.post-menu-btn:hover {
  background: var(--color-bg);
  color: var(--color-text-primary);
}

.post-content {
  margin-bottom: var(--space-md);
}

.post-text {
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  white-space: pre-wrap;
  word-wrap: break-word;
}

.post-image {
  width: 100%;
  border-radius: var(--radius-md);
  object-fit: cover;
  cursor: pointer;
  transition: transform var(--transition-base);
}

.post-image:hover {
  transform: scale(1.02);
}

/* Post Video */
.post-video-container {
  position: relative;
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-darker);
}

.post-video {
  width: 100%;
  max-height: 450px;
  object-fit: cover;
  display: block;
}

.post-stats {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-sm);
}

.post-stat {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

.post-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.post-actions .post-action-btn {
  justify-content: center;
  padding: var(--space-md);
}

/* ===== Sidebar Right ===== */
.sidebar-right {
  position: sticky;
  top: calc(var(--header-height) + var(--space-lg));
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.widget {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 1px 3px rgba(6, 182, 212, 0.1);
  border: 1px solid var(--color-border);
}

.widget-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

.widget-title svg {
  color: var(--color-primary);
}

.widget-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.widget-item {
  transition: transform var(--transition-fast);
}

.widget-item:hover {
  transform: translateX(4px);
}

.widget-link {
  display: block;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.widget-link:hover {
  background: var(--color-bg);
}

.widget-item-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 0.125rem;
}

.widget-item-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-normal);
}

.widget-ad .ad-content {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  background: var(--color-bg);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}

/* ===== Footer ===== */
.footer {
  margin-top: var(--space-2xl);
  padding: var(--space-2xl) 0 var(--space-xl);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-bg);
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.footer-company-info {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  line-height: 1.8;
}

.footer-company-info p {
  margin: 0.25rem 0;
}

.footer-company-info strong {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-semibold);
}

/* ===== Responsive Design ===== */

/* Tablet */
@media (max-width: 1024px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
  
  .sidebar-left,
  .sidebar-right {
    display: none;
  }
}

/* Mobile L (425px - 768px) */
@media (max-width: 768px) {
  :root {
    --hero-height: 160px;
    --header-height: 3.5rem;
    --font-size-3xl: 1.375rem;
    --font-size-2xl: 1.25rem;
    --font-size-xl: 1.125rem;
    --font-size-lg: 1rem;
    --font-size-base: 0.9375rem;
    --font-size-sm: 0.8125rem;
    --font-size-xs: 0.6875rem;
    --space-xl: 1.5rem;
    --space-lg: 1rem;
    --space-md: 0.75rem;
  }
  
  body {
    font-size: 15px;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
  
  .header-content {
    gap: var(--space-sm);
    height: var(--header-height);
  }
  
  .logo {
    gap: 0.375rem;
  }
  
  .logo-icon {
    width: 2rem;
    height: 2rem;
    font-size: 0.625rem;
  }
  
  .logo-text {
    font-size: 0.875rem;
  }
  
  .logo-subtitle {
    display: none;
  }
  
  .search-container {
    max-width: none;
    flex: 1;
  }
  
  .search-input {
    padding: 0.5rem 0.75rem;
    padding-left: 2.25rem;
    font-size: 0.8125rem;
  }
  
  .search-icon {
    width: 16px;
    height: 16px;
    left: 0.75rem;
  }
  
  .header-nav {
    gap: var(--space-sm);
  }
  
  .header-nav .btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
  }
  
  .header-nav .btn-secondary {
    display: none;
  }
  
  .notification-btn {
    padding: 0.375rem;
  }
  
  .notification-btn svg {
    width: 20px;
    height: 20px;
  }
  
  .notification-badge {
    min-width: 1rem;
    height: 1rem;
    font-size: 0.625rem;
  }
  
  /* Hero Mobile */
  .hero {
    height: var(--hero-height);
  }
  
  .hero-content {
    padding: var(--space-md);
    margin-top: var(--space-lg);
  }
  
  .hero-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-sm);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-sm);
  }
  
  /* Main Content Mobile */
  .main-content {
    padding: var(--space-md) 0;
  }
  
  /* Feed Mobile */
  .feed {
    gap: var(--space-md);
  }
  
  /* Post Creator Mobile */
  .post-creator {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }
  
  .post-creator-header {
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
  }
  
  .avatar {
    width: 2rem;
    height: 2rem;
    font-size: 0.75rem;
  }
  
  .post-input {
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
  }
  
  .post-creator-actions {
    gap: var(--space-sm);
    padding-top: var(--space-sm);
    flex-wrap: wrap;
  }
  
  .post-action-btn {
    padding: 0.375rem 0.5rem;
    font-size: 0.75rem;
    gap: 0.25rem;
  }
  
  .post-action-btn svg {
    width: 16px;
    height: 16px;
  }
  
  .post-action-btn span {
    display: none;
  }
  
  .btn-post {
    flex: 1;
    min-width: 80px;
  }
  
  /* Post Mobile */
  .post {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }
  
  .post:hover {
    transform: none;
  }
  
  .post-header {
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
  }
  
  .post-author-name {
    font-size: 0.875rem;
  }
  
  .post-time {
    font-size: 0.6875rem;
  }
  
  .post-content {
    margin-bottom: var(--space-sm);
  }
  
  .post-text {
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--space-sm);
  }
  
  .post-image {
    border-radius: var(--radius-sm);
  }
  
  .post-stats {
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    margin-bottom: var(--space-sm);
  }
  
  .post-stat {
    font-size: 0.75rem;
    gap: 0.125rem;
  }
  
  .post-actions {
    gap: var(--space-xs);
  }
  
  .post-actions .post-action-btn {
    padding: var(--space-sm);
    justify-content: center;
  }
  
  .post-actions .post-action-btn svg {
    width: 18px;
    height: 18px;
  }
  
  /* Footer Mobile */
  .footer {
    padding: var(--space-lg) 0;
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-md);
  }
  
  .footer-title {
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
  }
  
  .footer-links a {
    font-size: 0.75rem;
  }
  
  .footer-social a {
    width: 2rem;
    height: 2rem;
  }
  
  .footer-bottom {
    padding-top: var(--space-md);
    font-size: 0.6875rem;
  }
  
  .footer-company-info {
    font-size: 0.625rem;
    padding-top: var(--space-sm);
    margin-top: var(--space-sm);
  }
  
  /* Button Mobile */
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
  }
  
  .btn-download {
    padding: var(--space-sm);
    font-size: 0.8125rem;
  }
  
  .btn-load-more {
    padding: var(--space-md);
    font-size: 0.875rem;
  }
}

/* Mobile M (375px - 425px) */
@media (max-width: 425px) {
  :root {
    --font-size-3xl: 1.25rem;
    --font-size-2xl: 1.125rem;
    --font-size-xl: 1rem;
    --font-size-lg: 0.9375rem;
    --font-size-base: 0.875rem;
    --font-size-sm: 0.75rem;
    --font-size-xs: 0.625rem;
  }
  
  body {
    font-size: 14px;
  }
  
  .container {
    padding: 0 0.75rem;
  }
  
  .logo-text {
    display: none;
  }
  
  .header-nav .btn {
    padding: 0.375rem 0.625rem;
    font-size: 0.6875rem;
  }
  
  .hero-title {
    font-size: 1.125rem;
  }
  
  .hero-subtitle {
    font-size: 0.75rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-social {
    justify-content: center;
  }
}

/* Mobile S (< 375px) */
@media (max-width: 374px) {
  :root {
    --font-size-3xl: 1.125rem;
    --font-size-2xl: 1rem;
    --font-size-xl: 0.9375rem;
    --font-size-lg: 0.875rem;
    --font-size-base: 0.8125rem;
    --font-size-sm: 0.6875rem;
    --font-size-xs: 0.5625rem;
    --space-md: 0.5rem;
    --space-lg: 0.75rem;
  }
  
  body {
    font-size: 13px;
  }
  
  .container {
    padding: 0 0.5rem;
  }
  
  .logo-icon {
    width: 1.75rem;
    height: 1.75rem;
    font-size: 0.5rem;
  }
  
  .header-nav .btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.625rem;
  }
  
  .post {
    padding: 0.75rem;
  }
  
  .avatar {
    width: 1.75rem;
    height: 1.75rem;
    font-size: 0.625rem;
  }
}

/* ===== Video Page Styles ===== */
.page-title {
  font-size: var(--font-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
  padding: 0 var(--space-md);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
  padding: var(--space-md);
}

.video-item {
  background: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.video-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.video-thumbnail {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  background: var(--bg-secondary);
  overflow: hidden;
}

.video-thumbnail img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-duration {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-sm);
  font-weight: 600;
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  background: rgba(0, 0, 0, 0.7);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.video-item:hover .video-play-btn {
  opacity: 1;
}

.video-info {
  padding: var(--space-md);
}

.video-author {
  display: flex;
  gap: var(--space-sm);
}

.video-title {
  font-size: var(--font-md);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-author-name {
  font-size: var(--font-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.video-meta {
  font-size: var(--font-sm);
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* ===== Friends Page ===== */
.friends-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
}

.friends-main {
  max-width: 900px;
}

.friends-header {
  margin-bottom: var(--space-xl);
}

.friends-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.friends-subtitle {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
}

.friends-section {
  margin-bottom: var(--space-2xl);
}

.friends-section .section-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.friends-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.friend-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-md);
  transition: all var(--transition-base);
}

.friend-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.15);
  border-color: var(--color-primary);
}

.friend-avatar {
  width: 80px;
  height: 80px;
  font-size: var(--font-size-2xl);
}

.friend-info {
  flex: 1;
}

.friend-name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.friend-role {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.friend-mutual {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.friend-status {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.friend-status.online {
  color: var(--color-success);
}

.friend-status.online::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  margin-right: var(--space-xs);
}

.friend-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-border);
}

@media (max-width: 768px) {
  .friends-layout {
    grid-template-columns: 1fr;
    padding: var(--space-md) 0;
    gap: var(--space-md);
  }
  
  .friends-layout .sidebar-left {
    display: none;
  }
  
  .friends-header {
    margin-bottom: var(--space-md);
  }
  
  .friends-title {
    font-size: var(--font-size-xl);
  }
  
  .friends-subtitle {
    font-size: var(--font-size-sm);
  }
  
  .friends-section {
    margin-bottom: var(--space-lg);
  }
  
  .friends-section .section-title {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-md);
  }
  
  .friends-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .friend-card {
    padding: var(--space-md);
    gap: var(--space-sm);
  }
  
  .friend-card:hover {
    transform: none;
  }
  
  .friend-avatar {
    width: 60px;
    height: 60px;
    font-size: var(--font-size-lg);
  }
  
  .friend-name {
    font-size: var(--font-size-sm);
  }
  
  .friend-role {
    font-size: var(--font-size-xs);
  }
  
  .friend-mutual,
  .friend-status {
    font-size: var(--font-size-xs);
  }
  
  .btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size-xs);
  }
}

/* ===== News Page ===== */
.news-layout {
  display: grid;
  grid-template-columns: 280px 1fr 300px;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
}

.news-main {
  min-width: 0;
}

.news-header {
  margin-bottom: var(--space-xl);
}

.news-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.news-subtitle {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
}

.news-featured {
  margin-bottom: var(--space-xl);
}

.news-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.15);
}

.news-card.featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.news-card-image {
  position: relative;
  overflow: hidden;
}

.news-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.news-card:hover .news-card-image img {
  transform: scale(1.05);
}

.news-badge {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-primary);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-sm);
}

.news-badge.hot {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

.news-card-content {
  padding: var(--space-lg);
}

.news-category {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.news-card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.news-card.featured .news-card-title {
  font-size: var(--font-size-xl);
}

.news-card-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.news-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.news-categories {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.news-category-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
}

.news-category-btn:hover,
.news-category-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.news-grid .news-card-image {
  height: 180px;
}

.news-load-more {
  text-align: center;
}

.news-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-lg));
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.trending-list {
  list-style: none;
}

.trending-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.trending-item:last-child {
  border-bottom: none;
}

.trending-number {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  min-width: 24px;
}

.trending-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  line-height: 1.4;
}

.trending-link:hover {
  color: var(--color-primary);
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
}

.tag:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

@media (max-width: 1024px) {
  .news-layout {
    grid-template-columns: 1fr;
  }
  
  .news-layout .sidebar-left,
  .news-sidebar {
    display: none;
  }
  
  .news-card.featured {
    grid-template-columns: 1fr;
  }
  
  .news-card.featured .news-card-image {
    height: 200px;
  }
}

@media (max-width: 768px) {
  .news-layout {
    padding: var(--space-md) 0;
    gap: var(--space-md);
  }
  
  .news-header {
    margin-bottom: var(--space-md);
  }
  
  .news-title {
    font-size: var(--font-size-xl);
  }
  
  .news-subtitle {
    font-size: var(--font-size-sm);
  }
  
  .news-featured {
    margin-bottom: var(--space-md);
  }
  
  .news-card.featured .news-card-image {
    height: 160px;
  }
  
  .news-card.featured .news-card-title {
    font-size: var(--font-size-lg);
  }
  
  .news-categories {
    margin-bottom: var(--space-md);
    gap: var(--space-xs);
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--space-xs);
    -webkit-overflow-scrolling: touch;
  }
  
  .news-categories::-webkit-scrollbar {
    display: none;
  }
  
  .news-category-btn {
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size-xs);
    white-space: nowrap;
    flex-shrink: 0;
  }
  
  .news-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
  }
  
  .news-grid .news-card-image {
    height: 140px;
  }
  
  .news-card-content {
    padding: var(--space-md);
  }
  
  .news-category {
    font-size: 0.625rem;
    margin-bottom: var(--space-xs);
  }
  
  .news-card-title {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-xs);
  }
  
  .news-card-excerpt {
    font-size: var(--font-size-xs);
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  
  .news-card-meta {
    font-size: var(--font-size-xs);
    gap: var(--space-sm);
  }
  
  .news-load-more .btn {
    width: 100%;
    font-size: var(--font-size-sm);
  }
}

/* ===== Auth Pages ===== */
.auth-page {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--color-bg), #e0f2fe);
}

.auth-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height));
  padding: var(--space-xl);
}

.auth-container {
  width: 100%;
  max-width: 440px;
}

.auth-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
}

.auth-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.auth-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.auth-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.form-input {
  width: 100%;
  padding: 0.75rem var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.password-input-wrapper {
  position: relative;
}

.toggle-password {
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  padding: var(--space-xs);
}

.toggle-password:hover {
  color: var(--color-primary);
}

.form-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
}

.checkbox-label input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-primary);
}

.forgot-password {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.forgot-password:hover {
  text-decoration: underline;
}

.btn-full {
  width: 100%;
  padding: 0.875rem;
  font-size: var(--font-size-base);
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.auth-divider span {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.social-login {
  display: flex;
  gap: var(--space-md);
}

.btn-social {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.btn-social:hover {
  background: var(--color-surface);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.auth-footer-text {
  text-align: center;
  margin-top: var(--space-xl);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.auth-link {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.auth-link:hover {
  text-decoration: underline;
}

/* ===== Profile Page ===== */
.profile-cover {
  position: relative;
  height: 280px;
  background: var(--color-primary);
  overflow: hidden;
}

.cover-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.3));
}

.btn-change-cover {
  position: absolute;
  bottom: var(--space-lg);
  right: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.btn-change-cover:hover {
  background: white;
  box-shadow: var(--shadow-md);
}

.profile-main {
  background: var(--color-bg);
  min-height: calc(100vh - var(--header-height) - 280px);
  padding-bottom: var(--space-2xl);
}

.profile-header {
  display: flex;
  align-items: flex-end;
  gap: var(--space-xl);
  padding: 0 var(--space-lg);
  margin-top: -60px;
  position: relative;
  z-index: 10;
}

.profile-avatar-wrapper {
  position: relative;
  flex-shrink: 0;
}

.profile-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 4px solid var(--color-surface);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
}

.profile-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.btn-change-avatar {
  position: absolute;
  bottom: 8px;
  right: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.btn-change-avatar:hover {
  background: var(--color-primary-dark);
  transform: scale(1.1);
}

/* Hidden file input */
.file-input-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Image upload loading state */
.profile-avatar.loading::after,
.profile-cover.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.profile-avatar.loading::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  margin: -12px 0 0 -12px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  z-index: 11;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.profile-info {
  flex: 1;
  padding-bottom: var(--space-lg);
}

.profile-name {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.profile-bio {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.profile-stats {
  display: flex;
  gap: var(--space-xl);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.profile-actions {
  padding-bottom: var(--space-lg);
}

.profile-content {
  margin-top: var(--space-xl);
}

.profile-tabs {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.tab-btn {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.tab-btn.active {
  background: var(--color-primary);
  color: white;
}

.profile-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: var(--space-xl);
}

.profile-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.profile-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.card-header .card-title {
  margin-bottom: 0;
}

.see-all-link {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.about-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.about-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.about-item svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.interests-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.interest-tag {
  padding: var(--space-xs) var(--space-md);
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(14, 165, 233, 0.1));
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.photos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.photos-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.photos-grid img:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

.profile-posts {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ===== Profile Responsive ===== */
@media (max-width: 1024px) {
  .profile-grid {
    grid-template-columns: 1fr;
  }
  
  .profile-sidebar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .profile-cover {
    height: 140px;
  }
  
  .btn-change-cover {
    bottom: var(--space-sm);
    right: var(--space-sm);
    padding: 0.25rem 0.5rem;
    font-size: var(--font-size-xs);
    gap: 0.25rem;
  }
  
  .btn-change-cover svg {
    width: 12px;
    height: 12px;
  }
  
  .profile-main {
    min-height: auto;
    padding-bottom: var(--space-lg);
  }
  
  .profile-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-top: -50px;
    padding: 0 var(--space-md);
    gap: var(--space-md);
  }
  
  .profile-avatar {
    width: 100px;
    height: 100px;
    border-width: 3px;
  }
  
  .btn-change-avatar {
    width: 28px;
    height: 28px;
    bottom: 4px;
    right: 4px;
  }
  
  .btn-change-avatar svg {
    width: 12px;
    height: 12px;
  }
  
  .profile-info {
    padding-bottom: 0;
  }
  
  .profile-name {
    font-size: var(--font-size-xl);
    margin-bottom: 0.25rem;
  }
  
  .profile-bio {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
  }
  
  .profile-stats {
    justify-content: center;
    gap: var(--space-lg);
  }
  
  .stat-value {
    font-size: var(--font-size-lg);
  }
  
  .stat-label {
    font-size: var(--font-size-xs);
  }
  
  .profile-actions {
    padding-bottom: 0;
  }
  
  .profile-actions .btn {
    font-size: var(--font-size-sm);
    padding: 0.5rem 1rem;
  }
  
  .profile-content {
    margin-top: var(--space-md);
  }
  
  .profile-tabs {
    padding: var(--space-sm) 0;
    margin-bottom: var(--space-md);
    gap: var(--space-xs);
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
  }
  
  .profile-tabs::-webkit-scrollbar {
    display: none;
  }
  
  .tab-btn {
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size-xs);
    white-space: nowrap;
    flex-shrink: 0;
  }
  
  .profile-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .profile-sidebar {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .profile-card {
    padding: var(--space-md);
  }
  
  .card-title {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-sm);
  }
  
  .about-list {
    gap: var(--space-sm);
  }
  
  .about-item {
    font-size: var(--font-size-xs);
    gap: var(--space-sm);
  }
  
  .about-item svg {
    width: 16px;
    height: 16px;
  }
  
  .interests-tags {
    gap: var(--space-xs);
  }
  
  .interest-tag {
    padding: 0.25rem 0.625rem;
    font-size: var(--font-size-xs);
  }
  
  .photos-grid {
    gap: var(--space-xs);
  }
  
  .photos-grid img {
    border-radius: var(--radius-sm);
  }
  
  .profile-posts {
    gap: var(--space-md);
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .auth-main {
    padding: var(--space-md);
  }
  
  .auth-card {
    padding: var(--space-lg);
  }
  
  .auth-title {
    font-size: var(--font-size-xl);
  }
  
  .auth-subtitle {
    font-size: var(--font-size-xs);
  }
  
  .auth-form {
    gap: var(--space-md);
  }
  
  .form-label {
    font-size: var(--font-size-xs);
  }
  
  .form-input {
    padding: 0.625rem 0.75rem;
    font-size: var(--font-size-sm);
  }
  
  .form-options {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  
  .checkbox-label {
    font-size: var(--font-size-xs);
  }
  
  .forgot-password {
    font-size: var(--font-size-xs);
  }
  
  .btn-full {
    padding: 0.75rem;
    font-size: var(--font-size-sm);
  }
  
  .auth-divider {
    margin: var(--space-md) 0;
  }
  
  .auth-divider span {
    font-size: var(--font-size-xs);
  }
  
  .social-login {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .btn-social {
    padding: 0.625rem;
    font-size: var(--font-size-sm);
  }
  
  .auth-footer-text {
    font-size: var(--font-size-xs);
    margin-top: var(--space-md);
  }
}

/* ===== Modal Styles ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  padding: var(--space-lg);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow: hidden;
  transform: translateY(20px) scale(0.95);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-xl);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-bg);
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--space-xl);
  overflow-y: auto;
  max-height: calc(90vh - 140px);
}

.form-section {
  margin-bottom: var(--space-xl);
}

.form-section:last-of-type {
  margin-bottom: 0;
}

.form-section-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  padding-right: 2.5rem;
}

.interests-editor {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.interest-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.interest-checkbox:hover {
  background: var(--color-border);
}

.interest-checkbox input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-primary);
}

.interest-checkbox label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-md);
  padding-top: var(--space-xl);
  margin-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

/* ===== Dark Mode ===== */
[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-elevated: #334155;
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #64748b;
  --color-border: #334155;
  --color-border-light: #1e293b;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-overlay: rgba(0, 0, 0, 0.85);
  --color-input-bg: #1e293b;
  --color-card-hover: rgba(6, 182, 212, 0.08);
}

/* Dark mode specific overrides */
[data-theme="dark"] .hero-overlay {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.85), rgba(14, 165, 233, 0.75));
}

[data-theme="dark"] .logo-icon {
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.4);
}

[data-theme="dark"] .btn-primary {
  box-shadow: 0 2px 8px rgba(6, 182, 212, 0.35);
}

[data-theme="dark"] .btn-primary:hover {
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.45);
}

[data-theme="dark"] .search-input {
  background: var(--color-input-bg);
}

[data-theme="dark"] .search-input:focus {
  background: var(--color-surface);
}

[data-theme="dark"] .post,
[data-theme="dark"] .news-card,
[data-theme="dark"] .friend-card,
[data-theme="dark"] .video-item,
[data-theme="dark"] .widget,
[data-theme="dark"] .auth-card {
  background: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme="dark"] .nav-item:hover,
[data-theme="dark"] .nav-item.active {
  background: var(--color-surface-elevated);
}

[data-theme="dark"] .notification-btn:hover,
[data-theme="dark"] .mobile-nav-close:hover,
[data-theme="dark"] .mobile-menu-btn:hover {
  background: var(--color-surface-elevated);
}

[data-theme="dark"] .post-input,
[data-theme="dark"] .form-input,
[data-theme="dark"] .form-textarea,
[data-theme="dark"] .form-select {
  background: var(--color-input-bg);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

[data-theme="dark"] .post-input::placeholder,
[data-theme="dark"] .form-input::placeholder {
  color: var(--color-text-muted);
}

[data-theme="dark"] .modal {
  background: var(--color-surface);
}

[data-theme="dark"] .modal-header,
[data-theme="dark"] .modal-close:hover {
  background: var(--color-surface-elevated);
}

[data-theme="dark"] .interest-checkbox {
  background: var(--color-input-bg);
}

[data-theme="dark"] .interest-checkbox:hover {
  background: var(--color-surface-elevated);
}

[data-theme="dark"] .tabs {
  background: var(--color-surface);
}

[data-theme="dark"] .tab-btn:hover,
[data-theme="dark"] .tab-btn.active {
  background: var(--color-surface-elevated);
}

[data-theme="dark"] .profile-cover::after {
  background: linear-gradient(to top, var(--color-bg), transparent);
}

[data-theme="dark"] .mobile-nav {
  background: var(--color-surface);
}

[data-theme="dark"] .mobile-nav-header {
  border-color: var(--color-border);
}

[data-theme="dark"] .category-tabs {
  background: var(--color-surface);
}

[data-theme="dark"] .news-category-btn:hover,
[data-theme="dark"] .news-category-btn.active {
  background: var(--color-surface-elevated);
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

[data-theme="dark"] .theme-toggle:hover {
  background: var(--color-surface-elevated);
}

.theme-icons {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  width: 20px;
  height: 20px;
  position: absolute;
  top: 0;
  left: 0;
  transition: opacity 0.3s ease, transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* Theme label for mobile nav */
.theme-label-light {
  opacity: 1;
  transition: opacity 0.3s ease;
}

.theme-label-dark {
  position: absolute;
  opacity: 0;
  transition: opacity 0.3s ease;
}

[data-theme="dark"] .theme-label-light {
  opacity: 0;
  position: absolute;
}

[data-theme="dark"] .theme-label-dark {
  opacity: 1;
  position: static;
}

/* Mobile theme toggle in nav footer */
.theme-toggle-mobile {
  width: 100%;
  margin-bottom: var(--space-md);
  justify-content: center;
  gap: var(--space-sm);
  border: 1px solid var(--color-border);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  position: relative;
}

.theme-toggle-mobile .theme-icons {
  position: relative;
}

.theme-toggle-mobile .theme-label-light,
.theme-toggle-mobile .theme-label-dark {
  position: static;
}

[data-theme="dark"] .theme-toggle-mobile .theme-label-light {
  display: none;
}

.theme-toggle-mobile .theme-label-dark {
  display: none;
}

[data-theme="dark"] .theme-toggle-mobile .theme-label-dark {
  display: inline;
}

/* ===== Toast Notification ===== */
.toast-notification {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-weight: var(--font-weight-medium);
}

.toast-notification.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast-notification svg {
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .toast-notification {
    bottom: 16px;
    left: 16px;
    right: 16px;
    transform: translateX(0) translateY(100px);
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
  }
  
  .toast-notification.show {
    transform: translateX(0) translateY(0);
  }
}

/* ===== Image Cropper Modal ===== */
.cropper-modal {
  max-width: 600px;
  width: 95%;
}

.cropper-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.cropper-container {
  position: relative;
  width: 100%;
  height: 350px;
  background: #1a1a2e;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: grab;
}

.cropper-container:active {
  cursor: grabbing;
}

#cropperCanvas {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: none;
}

.crop-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.crop-area {
  border: 3px solid white;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.6);
  background: transparent;
}

.crop-area.circle {
  border-radius: 50%;
}

.crop-area.rectangle {
  border-radius: var(--radius-md);
}

.cropper-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
}

.control-group {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
  max-width: 400px;
}

.control-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.zoom-slider {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  appearance: none;
  cursor: pointer;
}

.zoom-slider::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(6, 182, 212, 0.4);
  transition: transform var(--transition-fast);
}

.zoom-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.zoom-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: none;
}

#zoomValue {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  min-width: 45px;
  text-align: right;
}

.cropper-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
}

@media (max-width: 768px) {
  .cropper-modal {
    max-width: 100%;
    margin: var(--space-md);
  }
  
  .cropper-container {
    height: 280px;
  }
  
  .control-group {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ===== Performance Optimizations ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== Accessibility ===== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ===== Modal Responsive ===== */
@media (max-width: 768px) {
  .modal-overlay {
    padding: 0;
    align-items: flex-end;
  }
  
  .modal {
    max-height: 90vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  }
  
  .modal-header {
    padding: var(--space-md) var(--space-lg);
  }
  
  .modal-title {
    font-size: var(--font-size-lg);
  }
  
  .modal-close {
    width: 32px;
    height: 32px;
  }
  
  .modal-body {
    padding: var(--space-md) var(--space-lg);
    max-height: calc(90vh - 120px);
  }
  
  .form-section {
    margin-bottom: var(--space-md);
  }
  
  .form-section-title {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-xs);
  }
  
  .interests-editor {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }
  
  .interest-checkbox {
    padding: 0.375rem 0.625rem;
  }
  
  .interest-checkbox input {
    width: 0.875rem;
    height: 0.875rem;
  }
  
  .interest-checkbox label {
    font-size: var(--font-size-xs);
  }
  
  .modal-footer {
    flex-direction: column-reverse;
    padding-top: var(--space-md);
    margin-top: var(--space-md);
    gap: var(--space-sm);
  }
  
  .modal-footer .btn {
    width: 100%;
    font-size: var(--font-size-sm);
  }
}

/* ===== Video Page Mobile ===== */
@media (max-width: 768px) {
  .video-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding: var(--space-sm);
  }
  
  .video-item {
    border-radius: var(--radius-md);
  }
  
  .video-duration {
    padding: 0.125rem 0.375rem;
    font-size: 0.625rem;
    bottom: var(--space-xs);
    right: var(--space-xs);
  }
  
  .video-play-btn {
    width: 48px;
    height: 48px;
  }
  
  .video-play-btn svg {
    width: 24px;
    height: 24px;
  }
  
  .video-info {
    padding: var(--space-sm);
  }
  
  .video-author {
    gap: var(--space-xs);
  }
  
  .video-author .avatar {
    width: 1.75rem;
    height: 1.75rem;
  }
  
  .video-title {
    font-size: var(--font-size-sm);
    margin-bottom: 0.125rem;
  }
  
  .video-author-name {
    font-size: var(--font-size-xs);
  }
  
  .video-meta {
    font-size: 0.625rem;
    margin-top: 0.125rem;
  }
  
  .page-title {
    font-size: var(--font-size-xl);
    padding: 0 var(--space-sm);
    margin-bottom: var(--space-md);
  }
}

/* ===== Touch Improvements ===== */
@media (hover: none) and (pointer: coarse) {
  /* Disable hover effects on touch devices */
  .post:hover,
  .news-card:hover,
  .friend-card:hover,
  .video-item:hover {
    transform: none;
    box-shadow: inherit;
  }
  
  /* Better touch targets */
  .btn,
  .nav-item,
  .post-action-btn,
  .tab-btn,
  .news-category-btn {
    min-height: 44px;
  }
  
  /* Show play button always on touch devices */
  .video-play-btn {
    opacity: 1;
  }
}

/* ===== Safe Area for Notch Devices ===== */
@supports (padding: max(0px)) {
  .header {
    padding-top: max(0px, env(safe-area-inset-top));
  }
  
  .footer {
    padding-bottom: max(var(--space-xl), env(safe-area-inset-bottom));
  }
  
  .modal-overlay {
    padding-bottom: max(0px, env(safe-area-inset-bottom));
  }
}