/* ===== Variables ===== */
:root {
  --bg: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --bg-input: #1a1a2e;
  --text: #e8e8f0;
  --text-secondary: #9999aa;
  --accent: #e94560;
  --accent-hover: #ff6b81;
  --border: #2a2a3e;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --tag-bg: rgba(233,69,96,0.12);
  --tag-text: #e94560;
}

[data-theme="light"] {
  --bg: #f0f2f5;
  --bg-card: #ffffff;
  --bg-card-hover: #f8f9ff;
  --bg-input: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #667788;
  --accent: #e94560;
  --accent-hover: #d63850;
  --border: #e0e0e8;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --tag-bg: rgba(233,69,96,0.08);
  --tag-text: #c0392b;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

/* ===== Header ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}
.logo span {
  margin-left: 4px;
  color: var(--accent);
}

.btn-icon {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  padding: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.btn-icon:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--tag-bg);
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 48px 24px 24px;
}
.hero h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.hero p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ===== Search ===== */
.search-section {
  max-width: 600px;
  margin: 0 auto 32px;
  padding: 0 24px;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}
.search-box svg {
  position: absolute;
  left: 16px;
  color: var(--text-secondary);
  pointer-events: none;
}
.search-box input {
  width: 100%;
  padding: 14px 16px 14px 48px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-input);
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.3s;
}
.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(233,69,96,0.15);
}
.search-box input::placeholder {
  color: var(--text-secondary);
}

/* ===== Categories ===== */
.categories {
  max-width: 1200px;
  margin: 0 auto 32px;
  padding: 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.cat-btn {
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}
.cat-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.cat-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ===== Card Grid ===== */
.card-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 48px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 960px) {
  .card-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 720px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .card-grid { grid-template-columns: 1fr; }
  .hero h2 { font-size: 1.5rem; }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.25s;
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}
.card:hover::before { opacity: 1; }

.card.hidden { display: none; }

.card-icon-wrap {
  position: relative;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.card-icon-img {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  object-fit: contain;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  transition: opacity 0.2s;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  position: absolute;
  top: 0;
  left: 0;
}

.card-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

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

.card-tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 10px;
  background: var(--tag-bg);
  color: var(--tag-text);
}

.card-arrow {
  position: absolute;
  top: 16px;
  right: 16px;
  color: var(--text-secondary);
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
}
.card:hover .card-arrow {
  opacity: 1;
  transform: translateX(3px);
}

/* ===== Empty State ===== */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}
.empty-state svg { margin-bottom: 16px; }
.empty-state p { font-size: 1.05rem; }

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
}