@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root {
  --bg-primary: #0a0a0b;
  --bg-secondary: #111113;
  --bg-card: #16161a;
  --bg-card-hover: #1c1c22;
  --border-color: #2a2a30;
  --text-primary: #e8e8ed;
  --text-secondary: #9898a0;
  --text-muted: #5a5a66;
  --accent-purple: #8b5cf6;
  --accent-blue: #3b82f6;
  --accent-pink: #ec4899;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --gradient-primary: linear-gradient(135deg, #8b5cf6, #3b82f6);
  --gradient-warm: linear-gradient(135deg, #ec4899, #f59e0b);
  --gradient-cool: linear-gradient(135deg, #06b6d4, #8b5cf6);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

img {
  max-width: 100%;
  display: block;
}

::selection {
  background: rgba(139, 92, 246, 0.3);
  color: #fff;
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== NAV ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.nav.scrolled {
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(42, 42, 48, 0.5);
  padding: 12px 0;
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--text-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== HERO ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 70% 50%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(236, 72, 153, 0.05) 0%, transparent 50%);
  animation: heroGlow 15s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-2%, -2%) rotate(3deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--accent-purple);
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.hero h1 .gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.8;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  animation: fadeInUp 0.8s ease 0.3s both;
}

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

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-family: inherit;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-muted);
  transform: translateY(-2px);
}

/* ========== STATS ========== */
.stats {
  padding: 60px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 24px;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ========== SECTION ========== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--accent-purple);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 16px auto 0;
  line-height: 1.8;
}

/* ========== FEATURE CARDS (Homepage) ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.feature-card:hover {
  border-color: rgba(139, 92, 246, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== TOOL PAGE ========== */
.tool-hero {
  padding: 140px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.tool-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.tool-hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 16px;
  position: relative;
}

.tool-hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
  position: relative;
}

/* Search */
.tool-search {
  max-width: 560px;
  margin: 36px auto 0;
  position: relative;
}

.tool-search input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.tool-search input::placeholder {
  color: var(--text-muted);
}

.tool-search input:focus {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

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

/* Filter Tabs */
.tool-filters {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 40px 0;
  padding: 0 24px;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  transition: var(--transition);
}

.filter-btn:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

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

/* Tool Grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
  padding-bottom: 100px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  border-color: rgba(139, 92, 246, 0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.tool-card-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}

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

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

.tool-card-info h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tool-card-info h3 .free-badge {
  font-size: 0.65rem;
  padding: 2px 8px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border-radius: 100px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.tool-card-info .tool-url {
  font-size: 0.78rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tool-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.tool-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tool-tag {
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(139, 92, 246, 0.08);
  color: var(--accent-purple);
  font-weight: 500;
}

.tool-arrow {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(139, 92, 246, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-purple);
  font-size: 0.85rem;
  transition: var(--transition);
  flex-shrink: 0;
}

.tool-card:hover .tool-arrow {
  background: var(--gradient-primary);
  color: #fff;
  transform: translateX(2px);
}

/* Category colors */
.cat-ai .tool-icon { background: rgba(139, 92, 246, 0.12); }
.cat-dev .tool-icon { background: rgba(59, 130, 246, 0.12); }
.cat-design .tool-icon { background: rgba(236, 72, 153, 0.12); }
.cat-efficiency .tool-icon { background: rgba(245, 158, 11, 0.12); }
.cat-resource .tool-icon { background: rgba(6, 182, 212, 0.12); }
.cat-media .tool-icon { background: rgba(16, 185, 129, 0.12); }

.cat-ai .tool-tag { background: rgba(139, 92, 246, 0.08); color: var(--accent-purple); }
.cat-dev .tool-tag { background: rgba(59, 130, 246, 0.08); color: var(--accent-blue); }
.cat-design .tool-tag { background: rgba(236, 72, 153, 0.08); color: var(--accent-pink); }
.cat-efficiency .tool-tag { background: rgba(245, 158, 11, 0.08); color: var(--accent-orange); }
.cat-resource .tool-tag { background: rgba(6, 182, 212, 0.08); color: var(--accent-cyan); }
.cat-media .tool-tag { background: rgba(16, 185, 129, 0.08); color: var(--accent-green); }

/* ========== FOOTER ========== */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 48px 0;
  text-align: center;
}

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

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

.footer a:hover {
  color: var(--text-primary);
}

/* ========== ABOUT SECTION ========== */
.about-section {
  padding: 100px 0;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h2 {
  font-size: 2rem;
  font-weight: 900;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.about-text p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-visual {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.05));
}

.about-visual .avatar-placeholder {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  position: relative;
  z-index: 1;
}

/* ========== CTA ========== */
.cta-section {
  padding: 100px 0;
}

.cta-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 80px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.cta-box h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 900;
  margin-bottom: 16px;
  position: relative;
}

.cta-box p {
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto 32px;
  line-height: 1.8;
  position: relative;
}

/* ========== ANIMATIONS ========== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== NO RESULTS ========== */
.no-results {
  text-align: center;
  padding: 80px 20px;
  display: none;
}

.no-results.show {
  display: block;
}

.no-results .emoji {
  font-size: 3rem;
  margin-bottom: 16px;
}

.no-results h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.no-results p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-visual {
    max-width: 400px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 11, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
    z-index: 999;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.3rem;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

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

  .features-grid {
    grid-template-columns: 1fr;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .section {
    padding: 60px 0;
  }

  .tool-hero {
    padding: 120px 0 40px;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .tool-filters {
    gap: 8px;
  }

  .filter-btn {
    padding: 6px 14px;
    font-size: 0.8rem;
  }
}