/* ============================================================
   Tina · 龙虾应用案例 — Apple Light Design System
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --bg: #f5f5f7;
  --bg-card: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #aeaeb2;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --accent-light: #e8f4fd;
  --border: #d2d2d7;
  --border-light: #f2f2f7;
  --shadow-sm: 0 1px 6px rgba(0, 0, 0, 0.07);
  --shadow-md: 0 2px 16px rgba(0, 0, 0, 0.09);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.13);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 100px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Menlo", monospace;
  --nav-h: 52px;
  --filter-h: 52px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }
img { display: block; max-width: 100%; }

/* ---------- Navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  display: flex;
  align-items: center;
  padding: 0 24px;
  transition: border-color var(--transition);
}
.navbar.scrolled { border-bottom-color: var(--border-light); }
.navbar-brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: 1;
}
.navbar-logo {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}
.navbar-sub {
  font-size: 13px;
  color: var(--text-secondary);
}
.navbar-count {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, #f5f5f7 0%, #ffffff 100%);
  padding: 72px 24px 56px;
  text-align: center;
}
.hero-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -1.5px;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 14px;
}
.hero-title span { color: var(--accent); }
.hero-subtitle {
  font-size: clamp(14px, 2vw, 17px);
  color: var(--text-secondary);
  margin-bottom: 32px;
  letter-spacing: -0.2px;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  transition: background var(--transition), transform var(--transition);
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-secondary {
  padding: 11px 24px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  transition: background var(--transition), transform var(--transition);
}
.btn-secondary:hover { background: rgba(0,0,0,0.04); transform: translateY(-1px); }

/* ---------- Filter Bar ---------- */
.filter-bar {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  padding: 10px 24px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.filter-bar::-webkit-scrollbar { display: none; }
.filter-pill {
  flex-shrink: 0;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
}
.filter-pill:hover { border-color: var(--accent); color: var(--accent); }
.filter-pill.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ---------- Cards Section ---------- */
.cards-section { padding: 32px 24px 64px; max-width: 1400px; margin: 0 auto; }
.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

/* ---------- Card ---------- */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.card-header { display: flex; align-items: center; gap: 10px; }
.card-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  background: var(--accent-light);
}
.card-titles { flex: 1; min-width: 0; }
.card-name-cn {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.card-name-en {
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 1px;
}
.card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.card-footer { display: flex; align-items: center; justify-content: space-between; }
.card-category {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 500;
  background: var(--accent-light);
  color: var(--accent);
}
.card-arrow {
  font-size: 12px;
  color: var(--text-tertiary);
  transition: transform var(--transition);
}
.card:hover .card-arrow { transform: translateX(3px); color: var(--accent); }

/* ---------- Category Colors ---------- */
.cat-social    .card-icon { background: #e8f4fd; }
.cat-creative  .card-icon { background: #eefbf0; }
.cat-infra     .card-icon { background: #fff4e6; }
.cat-productivity .card-icon { background: #ffebee; }
.cat-research  .card-icon { background: #f5eeff; }
.cat-finance   .card-icon { background: #eafaf1; }

.cat-social    .card-category { background: #e8f4fd; color: #0071e3; }
.cat-creative  .card-category { background: #eefbf0; color: #28a745; }
.cat-infra     .card-category { background: #fff4e6; color: #d97706; }
.cat-productivity .card-category { background: #ffebee; color: #e53e3e; }
.cat-research  .card-category { background: #f5eeff; color: #7c3aed; }
.cat-finance   .card-category { background: #eafaf1; color: #059669; }

/* ---------- Card Animation ---------- */
.card {
  animation: cardIn 0.3s ease both;
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.cards-grid.filtering .card { animation: none; transition: opacity 0.2s; }

/* ---------- Modal Overlay ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

/* ---------- Modal Box ---------- */
.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: min(640px, 100%);
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(8px);
  transition: transform var(--transition);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}
.modal::-webkit-scrollbar { width: 4px; }
.modal::-webkit-scrollbar-track { background: transparent; }
.modal::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.modal-header {
  position: sticky;
  top: 0;
  background: var(--bg-card);
  padding: 20px 20px 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  z-index: 1;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.modal-titles { flex: 1; min-width: 0; }
.modal-name-cn {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.modal-name-en {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 3px;
}
.modal-close {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: background var(--transition);
  margin-top: 2px;
}
.modal-close:hover { background: var(--border); color: var(--text-primary); }

.modal-body { padding: 16px 20px 24px; }
.modal-section { margin-bottom: 20px; }
.modal-section:last-child { margin-bottom: 0; }
.modal-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 8px;
}
.modal-desc {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.65;
}
.modal-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.skill-tag {
  padding: 4px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  font-family: var(--font-mono);
}
.modal-setup {
  background: #f9f9fb;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-primary);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
.modal-github {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 13px 20px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: background var(--transition);
  margin-top: 20px;
}
.modal-github:hover { background: var(--accent-hover); }

/* ---------- Footer ---------- */
.footer {
  padding: 32px 24px;
  text-align: center;
  border-top: 1px solid var(--border-light);
  color: var(--text-secondary);
  font-size: 13px;
}
.footer a { color: var(--accent); }
.footer a:hover { text-decoration: underline; }

/* ---------- Empty State ---------- */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 64px 24px;
  color: var(--text-secondary);
}
.empty-state-emoji { font-size: 40px; margin-bottom: 12px; }
.empty-state-text { font-size: 16px; }

/* ---------- Responsive ---------- */
@media (max-width: 1199px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .cards-grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 20px 40px; }
  .cards-section { padding: 24px 16px 48px; }
  .navbar { padding: 0 16px; }
  .filter-bar { padding: 10px 16px; }
  .navbar-sub { display: none; }
  .modal-name-cn { font-size: 19px; }
}
@media (max-width: 479px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary { width: 100%; max-width: 280px; text-align: center; }
}