:root {
  --bg-deepest: #0d0d12;
  --bg-card: #1a1a24;
  --bg-elevated: #252533;
  --accent-fuchsia: #e0218a;
  --accent-purple: #9d4edd;
  --accent-yellow: #ffbe0b;
  --text-primary: #f5f5f7;
  --text-secondary: #a0a0b0;
  --text-muted: #666680;
  --border: #2a2a3e;
  --danger: #ff4444;
  --success: #00cc66;
  --radius: 8px;
  --radius-sm: 4px;
  --nav-height: 60px;
  --content-max: 975px;
  --feed-max: 600px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--bg-deepest);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-yellow); text-decoration: none; }
a:hover { color: var(--accent-fuchsia); }

/* ========== Navbar ========== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 18, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--content-max);
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}

.nav-logo-img {
  height: 30px;
  width: auto;
}

.nav-search input {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 8px 12px;
  width: 250px;
  font-size: 13px;
  outline: none;
}
.nav-search input:focus { border-color: var(--accent-fuchsia); }

.nav-icons {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  background: none;
  border: none;
  text-decoration: none;
  transition: color 0.2s, background 0.2s;
}
.nav-icon:hover, .nav-icon.active { color: var(--accent-fuchsia); background: rgba(224, 33, 138, 0.1); }
.nav-logout { cursor: pointer; }
.nav-logout-form { display: inline; }

/* ========== Layout ========== */
.page-container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 24px 16px;
  padding-bottom: 80px;
}

.feed-container {
  max-width: var(--feed-max);
  margin: 0 auto;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: var(--radius);
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
  font-family: var(--font);
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-fuchsia), var(--accent-purple));
  color: #fff;
}
.btn-primary:hover { opacity: 0.9; }
.btn-secondary {
  background: transparent;
  border: 1px solid var(--accent-purple);
  color: var(--accent-purple);
}
.btn-secondary:hover { background: rgba(157, 78, 221, 0.1); }
.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }

/* ========== Forms ========== */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 13px;
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="file"],
.form-group textarea {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 10px 12px;
  font-size: 14px;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group textarea:focus { border-color: var(--accent-fuchsia); }
.form-group textarea { resize: vertical; min-height: 80px; }
.form-error {
  color: var(--danger);
  font-size: 13px;
  margin-bottom: 12px;
  padding: 8px 12px;
  background: rgba(255, 68, 68, 0.1);
  border-radius: var(--radius-sm);
}
.form-success {
  color: var(--success);
  font-size: 13px;
  margin-bottom: 12px;
  padding: 8px 12px;
  background: rgba(0, 204, 102, 0.1);
  border-radius: var(--radius-sm);
}

/* ========== Auth Pages ========== */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}
.auth-card {
  max-width: 400px;
  width: 100%;
  text-align: center;
}
.auth-logo {
  width: 200px;
  margin: 0 auto 24px;
}
.auth-card h1 { font-size: 24px; margin-bottom: 8px; }
.auth-card .auth-subtitle { color: var(--text-secondary); margin-bottom: 24px; }
.auth-form {
  text-align: left;
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.auth-alt {
  margin-top: 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}
.auth-alt a { font-weight: 600; }

/* ========== Post Card ========== */
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.post-card:hover { border-color: rgba(224, 33, 138, 0.3); }

.post-header {
  display: flex;
  align-items: center;
  padding: 12px;
  gap: 10px;
}

.post-meta { flex: 1; display: flex; flex-direction: column; }
.post-username { font-weight: 600; color: var(--text-primary); text-decoration: none; }
.post-username:hover { color: var(--accent-fuchsia); }
.post-location { font-size: 12px; color: var(--text-muted); }
.post-time { font-size: 12px; color: var(--text-muted); }

.post-image-wrapper { width: 100%; }
.post-image { width: 100%; display: block; }

.post-actions {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  gap: 12px;
}
.like-btn, .comment-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  text-decoration: none;
}
.like-btn.liked { color: var(--accent-fuchsia); }
.like-btn:hover { color: var(--accent-fuchsia); }
.like-btn.liking { animation: heart-pop 0.3s ease; }

@keyframes heart-pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.3); }
  100% { transform: scale(1); }
}

.like-count { font-weight: 600; font-size: 13px; color: var(--text-primary); margin-left: auto; }

.post-caption {
  padding: 0 12px 8px;
  font-size: 14px;
  line-height: 1.5;
}
.caption-username { font-weight: 600; color: var(--text-primary); margin-right: 6px; text-decoration: none; }
.caption-username:hover { color: var(--accent-fuchsia); }

.post-recent-comments { padding: 0 12px 8px; }
.recent-comment { font-size: 13px; margin-bottom: 4px; }
.comment-username { font-weight: 600; color: var(--text-primary); margin-right: 6px; text-decoration: none; }
.view-all-comments { font-size: 13px; color: var(--text-muted); display: inline-block; margin-top: 4px; }
.view-all-comments:hover { color: var(--accent-fuchsia); }

.post-comment-form { border-top: 1px solid var(--border); padding: 8px 12px; }
.comment-form { display: flex; gap: 8px; }
.comment-form input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  font-family: var(--font);
}
.comment-form input::placeholder { color: var(--text-muted); }
.comment-submit {
  background: none;
  border: none;
  color: var(--accent-fuchsia);
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
}
.comment-submit:hover { opacity: 0.8; }
.comment-submit:disabled { color: var(--text-muted); }

/* ========== Hashtags & Mentions ========== */
.hashtag { color: var(--accent-purple); text-decoration: none; font-weight: 500; }
.hashtag:hover { color: var(--accent-fuchsia); }
.mention { color: var(--accent-yellow); text-decoration: none; font-weight: 500; }
.mention:hover { color: var(--accent-fuchsia); }

/* ========== Avatars ========== */
.avatar-sm, .avatar-md, .avatar-lg {
  border-radius: 50%;
  object-fit: cover;
  display: inline-block;
}
.avatar-sm { width: 32px; height: 32px; }
.avatar-md { width: 44px; height: 44px; }
.avatar-lg { width: 150px; height: 150px; }
.avatar-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: #fff;
  font-size: 13px;
}
.avatar-md.avatar-placeholder { font-size: 16px; }
.avatar-lg.avatar-placeholder { font-size: 42px; }

/* ========== Profile ========== */
.profile-header {
  display: flex;
  align-items: flex-start;
  gap: 40px;
  padding: 20px 0 40px;
}
.profile-avatar { flex-shrink: 0; }
.profile-avatar img, .profile-avatar .avatar-placeholder {
  border: 2px solid var(--border);
}
.profile-info { flex: 1; }
.profile-info h1 { font-size: 22px; margin-bottom: 4px; }
.profile-username { font-size: 16px; color: var(--text-secondary); margin-bottom: 16px; }
.profile-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 16px;
}
.profile-stat { cursor: default; }
.profile-stat .stat-num { font-weight: 700; font-size: 16px; }
.profile-stat .stat-label { color: var(--text-muted); font-size: 13px; }
.profile-bio { white-space: pre-wrap; margin-bottom: 8px; }
.profile-website { color: var(--accent-yellow); font-weight: 500; }
.profile-website:hover { color: var(--accent-fuchsia); }
.profile-location { color: var(--text-muted); font-size: 13px; margin-bottom: 8px; }
.profile-actions { display: flex; gap: 8px; margin-top: 12px; }

.profile-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}
.profile-grid-item {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: var(--radius-sm);
}
.profile-grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.profile-grid-item .grid-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  opacity: 0;
  transition: opacity 0.2s;
  font-weight: 700;
  color: #fff;
}
.profile-grid-item:hover .grid-overlay { opacity: 1; }

.profile-private {
  text-align: center;
  padding: 60px 0;
  color: var(--text-muted);
}
.profile-private svg { margin-bottom: 16px; }

/* ========== Post Detail ========== */
.post-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 500px;
}
.post-detail-image { display: flex; align-items: center; justify-content: center; background: #000; }
.post-detail-image img { width: 100%; height: auto; max-height: 700px; object-fit: contain; }

.post-detail-sidebar {
  display: flex;
  flex-direction: column;
  max-height: 700px;
}
.post-detail-header {
  display: flex;
  align-items: center;
  padding: 12px;
  gap: 10px;
  border-bottom: 1px solid var(--border);
}
.post-detail-comments {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}
.detail-comment {
  margin-bottom: 12px;
  font-size: 14px;
}
.detail-comment .comment-username { margin-right: 6px; }
.detail-comment .comment-time { font-size: 11px; color: var(--text-muted); margin-left: 4px; }
.detail-comment .comment-delete {
  font-size: 11px;
  color: var(--danger);
  cursor: pointer;
  margin-left: 8px;
  background: none;
  border: none;
  font-family: var(--font);
}

.post-detail-actions {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  gap: 12px;
  border-top: 1px solid var(--border);
}
.post-detail-caption {
  padding: 0 12px 8px;
}
.post-detail-time {
  padding: 0 12px 8px;
  font-size: 11px;
  color: var(--text-muted);
}

/* ========== Explore ========== */
.explore-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}
.trending-tags {
  margin-top: 32px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.trending-tags h3 { margin-bottom: 12px; }
.trending-tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.trending-tag {
  padding: 6px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--accent-purple);
  text-decoration: none;
}
.trending-tag:hover { border-color: var(--accent-fuchsia); color: var(--accent-fuchsia); }

/* ========== Search ========== */
.search-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.search-tab {
  padding: 12px 24px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.search-tab.active { color: var(--accent-fuchsia); border-bottom-color: var(--accent-fuchsia); }
.search-results { display: flex; flex-direction: column; gap: 8px; }

/* ========== Hashtag Page ========== */
.hashtag-header { text-align: center; padding: 20px 0 32px; }
.hashtag-header h1 { font-size: 28px; }
.hashtag-header .hashtag-count { color: var(--text-muted); margin-top: 4px; }

/* ========== Empty State ========== */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}
.empty-state h2 { margin-bottom: 8px; color: var(--text-secondary); }
.empty-state a { color: var(--accent-fuchsia); font-weight: 600; }

/* ========== Pagination ========== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 20px 0;
}
.page-btn {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
}
.page-btn:hover { border-color: var(--accent-fuchsia); color: var(--accent-fuchsia); }
.page-info { color: var(--text-muted); font-size: 13px; }

/* ========== Settings ========== */
.settings-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
}
.settings-nav { display: flex; flex-direction: column; gap: 4px; }
.settings-nav a {
  padding: 10px 14px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
}
.settings-nav a:hover { background: var(--bg-elevated); color: var(--text-primary); }
.settings-nav a.active { color: var(--accent-fuchsia); background: rgba(224, 33, 138, 0.1); }
.settings-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.settings-content h2 { margin-bottom: 20px; }

/* ========== Upload ========== */
.upload-area {
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s;
}
.upload-area:hover { border-color: var(--accent-fuchsia); }
.upload-area svg { color: var(--text-muted); margin-bottom: 12px; }
.upload-preview { max-width: 400px; margin: 20px auto; }
.upload-preview img { width: 100%; border-radius: var(--radius); }

/* ========== Admin ========== */
.admin-nav {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}
.admin-nav a {
  padding: 8px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13px;
}
.admin-nav a:hover { background: var(--bg-elevated); }
.admin-nav a.active { color: var(--accent-fuchsia); }

.admin-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.admin-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.admin-stat-card .stat-value { font-size: 24px; font-weight: 700; color: var(--accent-fuchsia); }
.admin-stat-card .stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.admin-table {
  width: 100%;
  border-collapse: collapse;
}
.admin-table th {
  text-align: left;
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
}
.admin-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.admin-table tr:hover td { background: var(--bg-elevated); }

.ctf-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
}
.ctf-badge.on { background: rgba(0, 204, 102, 0.15); color: var(--success); }
.ctf-badge.off { background: rgba(102, 102, 128, 0.15); color: var(--text-muted); }

.meta-table { width: 100%; margin-top: 16px; }

.admin-search-input {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 8px 12px;
  font-size: 13px;
  outline: none;
  width: 250px;
  transition: border-color 0.2s;
}
.admin-search-input:focus { border-color: var(--accent-fuchsia); }

/* ========== Followers ========== */
.follow-list { display: flex; flex-direction: column; gap: 8px; }

/* ========== Error ========== */
.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
  text-align: center;
}
.error-logo { width: 120px; margin-bottom: 24px; }
.error-page h1 { font-size: 48px; color: var(--accent-fuchsia); margin-bottom: 8px; }
.error-page p { color: var(--text-secondary); margin-bottom: 20px; }

/* ========== Mobile Nav ========== */
.mobile-nav { display: none; }

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .post-detail { grid-template-columns: 1fr; }
  .post-detail-image { order: -1; }
  .settings-layout { grid-template-columns: 1fr; }
  .settings-nav { flex-direction: row; flex-wrap: wrap; }
}

@media (max-width: 768px) {
  .nav-search { display: none; }
  .nav-icons { gap: 4px; }
  .nav-icon { width: 36px; height: 36px; }

  .profile-header { flex-direction: column; align-items: center; text-align: center; gap: 16px; }
  .profile-stats { justify-content: center; gap: 20px; }

  .page-container { padding-bottom: 70px; }

  .mobile-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 13, 18, 0.95);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--border);
    justify-content: space-around;
    padding: 8px 0;
  }
  .mobile-nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    width: 40px;
    height: 40px;
  }
  .mobile-nav-icon.active { color: var(--accent-fuchsia); }

  .admin-stats { grid-template-columns: repeat(2, 1fr); }
}

/* ========== Toast ========== */
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-elevated);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 14px;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-10px); }
.toast.error { border-color: var(--danger); }
.toast.success { border-color: var(--success); }

/* ========== Skeleton Loading ========== */
.skeleton {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
}
.skeleton-img { height: 300px; background: var(--bg-elevated); }
.skeleton-line { height: 12px; background: var(--bg-elevated); border-radius: 4px; margin: 12px; }
.skeleton-line.short { width: 60%; }
@keyframes shimmer {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}
.skeleton .skeleton-img, .skeleton .skeleton-line {
  animation: shimmer 1.5s infinite;
}