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

:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-hero: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  --bg-input: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-on-hero: #ffffff;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: #eef2ff;
  --radius: 12px;
  --radius-lg: 16px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --cat-ai: #6366f1;
  --cat-doc: #059669;
  --cat-design: #d946ef;
  --cat-dev: #f59e0b;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-hero: linear-gradient(135deg, #4338ca 0%, #6d28d9 50%, #7e22ce 100%);
  --bg-input: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --border-color: #334155;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);
  --accent: #818cf8;
  --accent-hover: #6366f1;
  --accent-light: #1e1b4b;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
img { max-width: 100%; display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--bg-hero);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  background: var(--bg-input);
}

.theme-toggle:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.github-link {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  background: var(--bg-input);
}

.github-link:hover {
  background: var(--accent-light);
  color: var(--accent);
}

/* ========== Hero ========== */
.hero {
  background: var(--bg-hero);
  padding: 60px 0 70px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 50%),
              radial-gradient(circle at 70% 30%, rgba(255,255,255,0.05) 0%, transparent 40%);
  animation: heroShimmer 15s ease-in-out infinite alternate;
}

@keyframes heroShimmer {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-2%, -1%) rotate(1deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-on-hero);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.hero h1 .gradient-text {
  background: linear-gradient(90deg, #fde68a, #fbbf24, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.125rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  line-height: 1.7;
}

/* ========== Search ========== */
.search-wrapper {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--text-muted);
  pointer-events: none;
  z-index: 1;
}

.search-input {
  width: 100%;
  height: 52px;
  border-radius: 26px;
  border: 2px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 0 20px 0 48px;
  font-size: 1rem;
  color: #fff;
  font-family: var(--font-sans);
  transition: all var(--transition);
  outline: none;
}

.search-input::placeholder {
  color: rgba(255,255,255,0.6);
}

.search-input:focus {
  border-color: rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.22);
  box-shadow: 0 0 0 4px rgba(255,255,255,0.1);
}

/* ========== Stats ========== */
.stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 36px;
}

.stat-item {
  text-align: center;
  color: rgba(255,255,255,0.9);
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 700;
  display: block;
}

.stat-label {
  font-size: 0.8rem;
  opacity: 0.8;
}

/* ========== Categories ========== */
.categories {
  padding: 32px 0 8px;
  position: sticky;
  top: 64px;
  z-index: 90;
  background: var(--bg-primary);
  transition: background var(--transition);
}

.categories-inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.categories-inner::-webkit-scrollbar { display: none; }

.cat-btn {
  padding: 10px 20px;
  border-radius: 25px;
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.cat-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.cat-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}

.cat-btn .cat-emoji {
  font-size: 1rem;
}

.cat-count {
  font-size: 0.75rem;
  background: rgba(0,0,0,0.08);
  padding: 1px 8px;
  border-radius: 10px;
  margin-left: 2px;
}

.cat-btn.active .cat-count {
  background: rgba(255,255,255,0.25);
}

/* ========== Tools Grid ========== */
.tools-section {
  padding: 24px 0 60px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.tools-count {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 960px) {
  .tools-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ========== Tool Card ========== */
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  opacity: 0;
  transition: opacity var(--transition);
}

.tool-card[data-category="ai"]::before { background: var(--cat-ai); }
.tool-card[data-category="doc"]::before { background: var(--cat-doc); }
.tool-card[data-category="design"]::before { background: var(--cat-design); }
.tool-card[data-category="dev"]::before { background: var(--cat-dev); }

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-card-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.tool-icon.ai { background: #eef2ff; }
.tool-icon.doc { background: #ecfdf5; }
.tool-icon.design { background: #fdf4ff; }
.tool-icon.dev { background: #fffbeb; }

[data-theme="dark"] .tool-icon.ai { background: #1e1b4b; }
[data-theme="dark"] .tool-icon.doc { background: #064e3b; }
[data-theme="dark"] .tool-icon.design { background: #3b0764; }
[data-theme="dark"] .tool-icon.dev { background: #451a03; }

.tool-info {
  flex: 1;
  min-width: 0;
}

.tool-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  line-height: 1.3;
}

.tool-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
}

.tool-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
}

.tool-tag.ai { background: #eef2ff; color: var(--cat-ai); }
.tool-tag.doc { background: #ecfdf5; color: var(--cat-doc); }
.tool-tag.design { background: #fdf4ff; color: var(--cat-design); }
.tool-tag.dev { background: #fffbeb; color: var(--cat-dev); }

[data-theme="dark"] .tool-tag.ai { background: rgba(99,102,241,0.15); color: #a5b4fc; }
[data-theme="dark"] .tool-tag.doc { background: rgba(5,150,105,0.15); color: #6ee7b7; }
[data-theme="dark"] .tool-tag.design { background: rgba(217,70,239,0.15); color: #f0abfc; }
[data-theme="dark"] .tool-tag.dev { background: rgba(245,158,11,0.15); color: #fcd34d; }

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  transition: all var(--transition);
  text-decoration: none;
}

.tool-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

.tool-btn .arrow {
  transition: transform var(--transition);
  font-size: 0.8rem;
}

.tool-btn:hover .arrow {
  transform: translateX(3px);
}

.tool-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  background: #fef3c7;
  color: #92400e;
}

[data-theme="dark"] .tool-badge {
  background: rgba(245,158,11,0.2);
  color: #fcd34d;
}

/* ========== Empty State ========== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 0.9rem;
}

/* ========== Footer ========== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  transition: background var(--transition), border-color var(--transition);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-heart {
  color: #ef4444;
}

/* ========== Back to Top ========== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

/* ========== Responsive ========== */
@media (max-width: 480px) {
  .hero { padding: 40px 0 50px; }
  .hero h1 { font-size: 1.8rem; }
  .hero p { font-size: 0.95rem; }
  .stats { gap: 24px; }
  .stat-number { font-size: 1.25rem; }
  .tool-card { padding: 18px; }
  .tool-icon { width: 42px; height: 42px; font-size: 1.2rem; }
  .tool-name { font-size: 0.95rem; }
  .tool-btn { padding: 7px 14px; font-size: 0.8rem; }
}

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

.tool-card {
  animation: fadeInUp 0.4s ease forwards;
  opacity: 0;
}

.tool-card:nth-child(1) { animation-delay: 0.02s; }
.tool-card:nth-child(2) { animation-delay: 0.06s; }
.tool-card:nth-child(3) { animation-delay: 0.10s; }
.tool-card:nth-child(4) { animation-delay: 0.14s; }
.tool-card:nth-child(5) { animation-delay: 0.18s; }
.tool-card:nth-child(6) { animation-delay: 0.22s; }
.tool-card:nth-child(7) { animation-delay: 0.26s; }
.tool-card:nth-child(8) { animation-delay: 0.30s; }
.tool-card:nth-child(9) { animation-delay: 0.34s; }
.tool-card:nth-child(10) { animation-delay: 0.38s; }
.tool-card:nth-child(11) { animation-delay: 0.42s; }

/* Hidden card */
.tool-card.hidden {
  display: none;
}

/* Loading skeleton effect */
.skeleton {
  background: linear-gradient(90deg, var(--bg-input) 25%, var(--bg-secondary) 50%, var(--bg-input) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ========== Pro Banner ========== */
.pro-banner {
  background: linear-gradient(90deg, #1e1b4b, #312e81, #3730a3);
  color: #fff;
  padding: 10px 0;
  position: relative;
  z-index: 110;
}

.pro-banner-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.pro-banner-text {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

.pro-banner-form {
  display: flex;
  gap: 6px;
}

.pro-banner-input {
  height: 34px;
  border-radius: 17px;
  border: 1px solid rgba(255,255,255,0.25);
  background: rgba(255,255,255,0.12);
  padding: 0 14px;
  font-size: 0.82rem;
  color: #fff;
  outline: none;
  width: 200px;
  font-family: var(--font-sans);
  transition: all var(--transition);
}

.pro-banner-input::placeholder {
  color: rgba(255,255,255,0.6);
}

.pro-banner-input:focus {
  border-color: rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.18);
}

.pro-banner-btn {
  height: 34px;
  border-radius: 17px;
  background: linear-gradient(135deg, #f59e0b, #f97316);
  color: #fff;
  padding: 0 18px;
  font-size: 0.82rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.pro-banner-btn:hover {
  transform: scale(1.03);
  box-shadow: 0 2px 10px rgba(245,158,11,0.4);
}

.pro-banner-close {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.7);
  border: none;
  cursor: pointer;
  font-size: 0.8rem;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.pro-banner-close:hover {
  background: rgba(255,255,255,0.25);
  color: #fff;
}

@media (max-width: 640px) {
  .pro-banner-text { font-size: 0.8rem; }
  .pro-banner-input { width: 150px; font-size: 0.78rem; }
  .pro-banner-btn { padding: 0 12px; font-size: 0.78rem; }
}

/* ========== Pro Badge on Tool Card ========== */
.tool-pro-badge {
  position: absolute;
  top: 12px;
  right: 80px;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  letter-spacing: 0.5px;
}

[data-theme="dark"] .tool-pro-badge {
  background: linear-gradient(135deg, #818cf8, #a78bfa);
}

/* ========== Ad Banners ========== */
.ad-banner {
  padding: 16px 0;
  background: transparent;
}

.ad-banner-mid {
  margin-top: -8px;
}

.ad-banner-footer {
  margin-bottom: 0;
}

.ad-slot {
  position: relative;
  max-width: 728px;
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px dashed var(--border-color);
  background: var(--bg-input);
  transition: all var(--transition);
}

.ad-label {
  position: absolute;
  top: 4px;
  left: 8px;
  font-size: 0.6rem;
  color: var(--text-muted);
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.ad-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 90px;
  color: var(--text-muted);
  font-size: 0.85rem;
  opacity: 0.4;
}

@media (max-width: 768px) {
  .ad-slot { max-width: 100%; }
  .ad-placeholder { height: 60px; font-size: 0.75rem; }
}

/* ========== Support Section ========== */
.support-section {
  padding: 48px 0 40px;
  background: var(--bg-input);
  border-top: 1px solid var(--border-color);
  transition: background var(--transition), border-color var(--transition);
}

.support-title {
  text-align: center;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.support-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 680px;
  margin: 0 auto;
}

.support-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 24px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  text-align: center;
  font-family: var(--font-sans);
  color: var(--text-primary);
}

.support-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.support-card-icon {
  font-size: 2rem;
  line-height: 1;
}

.support-card-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.support-card-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.support-card-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 600;
}

.coming-soon-badge {
  background: #fef3c7;
  color: #92400e;
}

[data-theme="dark"] .coming-soon-badge {
  background: rgba(245,158,11,0.2);
  color: #fcd34d;
}

@media (max-width: 640px) {
  .support-cards { grid-template-columns: 1fr; max-width: 300px; }
  .support-card { padding: 18px 14px; flex-direction: row; gap: 12px; text-align: left; }
  .support-card-icon { font-size: 1.5rem; }
}

/* ========== Footer Blog Link ========== */
.footer-blog-link {
  position: relative;
}

.footer-blog-link::after {
  content: '即将上线';
  font-size: 0.55rem;
  background: var(--accent-light);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 4px;
  vertical-align: super;
  font-weight: 600;
}