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

:root {
  --bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --card-shadow-hover: 0 10px 25px rgba(0,0,0,0.1);
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --tag-bg: #f3f4f6;
  --tag-text: #4b5563;
  --overlay: rgba(0,0,0,0.6);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 800px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --text: #e2e8f0;
    --text-secondary: #94a3b8;
    --border: #1e293b;
    --card-bg: #1e293b;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
    --card-shadow-hover: 0 10px 25px rgba(0,0,0,0.4);
    --accent: #60a5fa;
    --accent-hover: #93bbfd;
    --tag-bg: #334155;
    --tag-text: #cbd5e1;
    --overlay: rgba(0,0,0,0.8);
  }
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

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

/* ===== Header ===== */
header {
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--text);
}

.site-title:hover { opacity: 0.7; }

nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.2s;
}

nav a:hover { color: var(--text); }
nav a:hover::after { width: 100%; }
nav a.active { color: var(--text); }
nav a.active::after { width: 100%; }

/* ===== Hero Section ===== */
.hero {
  text-align: center;
  padding: 24px 0 48px;
}

.hero h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.hero p {
  color: var(--text-secondary);
  font-size: 16px;
}

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.filter-btn {
  background: none;
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all 0.2s;
  font-family: var(--font);
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ===== Content Grid ===== */
.content-grid {
  display: grid;
  gap: 24px;
  margin-bottom: 64px;
}

/* ===== Card ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--border);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
}

.card-cover {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  background: var(--tag-bg);
}

.card-cover-empty {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--tag-bg), var(--border));
  font-size: 32px;
  color: var(--text-secondary);
}

.card-body {
  padding: 20px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

.card-type {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--tag-bg);
  color: var(--tag-text);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.card-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  gap: 6px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.tag {
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 12px;
  background: var(--tag-bg);
  color: var(--tag-text);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 80px 24px;
  color: var(--text-secondary);
}

.empty-state .icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-state h3 {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--text);
}

/* ===== Modal ===== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 1000;
  padding: 40px 24px;
  overflow-y: auto;
  backdrop-filter: blur(4px);
}

.modal-overlay.open {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.modal {
  background: var(--bg);
  border-radius: var(--radius);
  max-width: 720px;
  width: 100%;
  padding: 0;
  position: relative;
  animation: modalIn 0.25s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--card-bg);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  cursor: pointer;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  z-index: 10;
  transition: transform 0.2s;
}

.modal-close:hover { transform: scale(1.1); }

.modal-cover {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: var(--radius) var(--radius) 0 0;
  display: block;
}

.modal-body {
  padding: 32px;
}

.modal-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}

.modal-title {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

.modal-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.modal-content p {
  margin-bottom: 16px;
}

.modal-content img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 24px 0;
  display: block;
}

/* Video container in modal */
.modal-video {
  margin: 24px 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.modal-video video {
  width: 100%;
  display: block;
  border-radius: var(--radius-sm);
}

.modal-tags {
  display: flex;
  gap: 8px;
  margin-top: 24px;
  flex-wrap: wrap;
}

/* ===== About Page ===== */
.about-page {
  padding: 24px 0 64px;
}

.about-header {
  text-align: center;
  margin-bottom: 40px;
}

.about-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 16px;
  background: var(--tag-bg);
  border: 3px solid var(--border);
}

.about-name {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.about-bio {
  max-width: 500px;
  margin: 0 auto;
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.8;
}

.about-social {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}

.about-social a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
  transition: all 0.2s;
}

.about-social a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
}

footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

footer a:hover { color: var(--accent); }

/* ===== Error State ===== */
.error-state {
  text-align: center;
  padding: 60px 24px;
}

.error-state h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.error-state p {
  color: var(--text-secondary);
}

/* ===== Loading State ===== */
.loading {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-secondary);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto 12px;
}

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

/* ===== Publish FAB ===== */
#publish-fab {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(59,130,246,0.35);
  z-index: 999;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

#publish-fab:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(59,130,246,0.5);
}

/* ===== Editor Styles ===== */
.pub-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}

.pub-input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  background: var(--card-bg);
  color: var(--text);
  font-family: var(--font);
  transition: border-color 0.2s;
  box-sizing: border-box;
}

.pub-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}

select.pub-input { cursor: pointer; }

.fab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  font-family: var(--font);
  transition: background 0.2s;
}

.fab-btn:hover { background: var(--accent-hover); }

.fab-btn-secondary {
  background: var(--tag-bg);
  color: var(--text);
}

.fab-btn-secondary:hover { opacity: 0.8; }

/* ===== Responsive ===== */
@media (min-width: 640px) {
  .content-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  header .container {
    flex-direction: column;
    gap: 16px;
  }

  .modal { margin: 0; }
  .modal-body { padding: 24px; }
  .modal-title { font-size: 22px; }

  .hero h1 { font-size: 24px; }
}