/* ============================================================
   ToolFusion - Engineering Knowledge & Professional Tools
   深色科技感主题样式表
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #0f1628;
  --bg-card: #131b30;
  --bg-card-hover: #1a2440;
  --bg-nav: rgba(10, 14, 23, 0.92);
  --text-primary: #e8edf5;
  --text-secondary: #8899b4;
  --text-muted: #5a6a85;
  --accent-blue: #1e90ff;
  --accent-cyan: #00d4ff;
  --accent-purple: #7c5cfc;
  --accent-green: #00e676;
  --accent-orange: #ff9100;
  --accent-pink: #ff4081;
  --border-color: rgba(30, 144, 255, 0.15);
  --border-active: rgba(30, 144, 255, 0.4);
  --glow-blue: rgba(30, 144, 255, 0.15);
  --glow-cyan: rgba(0, 212, 255, 0.1);
  --max-width: 1200px;
  --nav-height: 70px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Oxygen, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

ul { list-style: none; }

/* ---------- Selection ---------- */
::selection {
  background: var(--accent-blue);
  color: #fff;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: #2a3a5a; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #3a4a6a; }

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: transform var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-brand .brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
}

.nav-logo-img {
  height: 34px;
  width: auto;
  display: block;
  filter: brightness(1.1);
}

.nav-brand span {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Hero Logo */
.hero-logo {
  margin-bottom: 28px;
  display: flex;
  justify-content: center;
}

.hero-logo img {
  max-width: 160px;
  width: 90%;
  height: auto;
  display: block;
  filter: drop-shadow(0 0 30px rgba(30, 144, 255, 0.12));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-cyan);
  background: rgba(30, 144, 255, 0.08);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-normal);
  transform-origin: center;
}

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

.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

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

/* ---------- Section Base ---------- */
.section {
  padding: 100px 0;
  position: relative;
}

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: var(--nav-height) 24px 60px;
  overflow: hidden;
  background: linear-gradient(135deg, #0a0e17 0%, #0f1628 40%, #0d1a30 70%, #0a0e17 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(30, 144, 255, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(124, 92, 252, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(0, 212, 255, 0.04) 0%, transparent 50%);
  animation: heroGlow 15s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(2%, -1%) rotate(1deg); }
  66% { transform: translate(-1%, 2%) rotate(-1deg); }
  100% { transform: translate(1%, -2%) rotate(0.5deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 860px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(30, 144, 255, 0.1);
  border: 1px solid rgba(30, 144, 255, 0.25);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 32px;
  letter-spacing: 0.5px;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), #0066cc);
  color: #fff;
  box-shadow: 0 4px 20px rgba(30, 144, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(30, 144, 255, 0.45);
  color: #fff;
}

.btn-secondary {
  background: rgba(30, 144, 255, 0.1);
  color: var(--accent-blue);
  border: 1px solid rgba(30, 144, 255, 0.3);
}

.btn-secondary:hover {
  background: rgba(30, 144, 255, 0.2);
  transform: translateY(-2px);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

.hero-stat {
  text-align: center;
}

.hero-stat .num {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- Grid Cards ---------- */
.card-grid {
  display: grid;
  gap: 20px;
}

.card-grid-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }
.card-grid-5 { grid-template-columns: repeat(5, 1fr); }
.card-grid-6 { grid-template-columns: repeat(6, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--glow-blue);
}

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

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
  background: rgba(30, 144, 255, 0.1);
  transition: all var(--transition-normal);
}

.card:hover .card-icon {
  background: rgba(30, 144, 255, 0.2);
  transform: scale(1.1);
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

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

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

.card-tag {
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(30, 144, 255, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(30, 144, 255, 0.15);
  transition: all var(--transition-fast);
}

.card-tag:hover {
  background: rgba(30, 144, 255, 0.2);
  border-color: var(--accent-cyan);
}

/* Card Badge (Live / 已上线) */
.card-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  pointer-events: none;
  z-index: 2;
}

.card-badge-live {
  background: rgba(0, 230, 118, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(0, 230, 118, 0.35);
  box-shadow: 0 0 12px rgba(0, 230, 118, 0.1);
}

/* ---------- Standards (Tags Cloud) ---------- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.tag-item {
  padding: 12px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  cursor: pointer;
  letter-spacing: 0.5px;
}

.tag-item:hover {
  border-color: var(--accent-blue);
  color: var(--accent-cyan);
  box-shadow: 0 0 20px var(--glow-blue);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

/* ---------- AI Assistant Section ---------- */
.ai-assistant {
  background: linear-gradient(135deg, #0f1628 0%, #131b30 50%, #0d1a30 100%);
  position: relative;
  overflow: hidden;
}

.ai-assistant::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(30, 144, 255, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 70% 50%, rgba(124, 92, 252, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.ai-container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.ai-container h2 {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.ai-container > p {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 1.05rem;
}

.ai-search-box {
  display: flex;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid rgba(30, 144, 255, 0.2);
  border-radius: 60px;
  padding: 4px;
  overflow: hidden;
  transition: all var(--transition-normal);
  margin-bottom: 24px;
}

.ai-search-box:focus-within {
  border-color: var(--accent-blue);
  box-shadow: 0 0 30px var(--glow-blue);
}

.ai-search-box input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  padding: 16px 24px;
  color: var(--text-primary);
  font-size: 1rem;
}

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

.ai-search-box button {
  padding: 12px 32px;
  background: linear-gradient(135deg, var(--accent-blue), #0066cc);
  border: none;
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: 50px;
  margin: 4px;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.ai-search-box button:hover {
  box-shadow: 0 4px 20px rgba(30, 144, 255, 0.4);
}

.ai-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.ai-prompt-chip {
  padding: 8px 18px;
  background: rgba(30, 144, 255, 0.08);
  border: 1px solid rgba(30, 144, 255, 0.15);
  border-radius: 50px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ai-prompt-chip:hover {
  background: rgba(30, 144, 255, 0.15);
  color: var(--accent-cyan);
  border-color: var(--accent-blue);
}

/* ---------- Articles List ---------- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-category h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-category h3 a {
  color: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.article-category h3 a:hover {
  color: var(--accent-cyan);
}

.article-category h3 .cat-icon {
  font-size: 1.2rem;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.article-item {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

.article-item:last-child {
  border-bottom: none;
}

.article-item:hover {
  background: rgba(30, 144, 255, 0.05);
}

.article-item .title {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: 4px;
  line-height: 1.4;
}

.article-item .meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  gap: 12px;
}

/* ---------- API Section ---------- */
.api-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}

.api-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-normal);
}

.api-card:hover {
  border-color: var(--border-active);
  box-shadow: 0 8px 30px var(--glow-blue);
  transform: translateY(-2px);
}

.api-card .api-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.api-card .api-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent-cyan);
}

.api-card .api-method {
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 4px;
  background: rgba(0, 230, 118, 0.1);
  color: var(--accent-green);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.api-card .api-url {
  font-family: 'Courier New', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: rgba(0,0,0,0.3);
  padding: 8px 12px;
  border-radius: 6px;
  margin-bottom: 12px;
  word-break: break-all;
}

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

/* ---------- Footer ---------- */
.footer {
  background: #060912;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 0;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.footer-brand h3 span {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-col a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 5px 0;
  transition: all var(--transition-fast);
}

.footer-col a:hover {
  color: var(--accent-cyan);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: color var(--transition-fast);
}

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

/* ---------- Section Background Alternating ---------- */
.section-alt {
  background: var(--bg-secondary);
}

/* ---------- Animated Elements ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ---------- Particle / Grid background ---------- */
.grid-bg {
  background-image:
    linear-gradient(rgba(30, 144, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 144, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .card-grid-5 { grid-template-columns: repeat(4, 1fr); }
  .card-grid-6 { grid-template-columns: repeat(3, 1fr); }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
}

@media (max-width: 768px) {
  html { font-size: 15px; }

  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 14, 23, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-links.open {
    max-height: 500px;
    padding: 16px 24px;
  }

  .nav-links a {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.9rem;
  }

  .hero h1 { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1rem; }

  .hero-stats { gap: 30px; flex-wrap: wrap; }

  .section-header h2 { font-size: 1.7rem; }

  .card-grid-2,
  .card-grid-3,
  .card-grid-4,
  .card-grid-5,
  .card-grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .hero-buttons .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }

  .ai-search-box {
    flex-direction: column;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    gap: 12px;
  }

  .ai-search-box input {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
  }

  .ai-search-box input:focus {
    border-color: var(--accent-blue);
  }

  .ai-search-box button {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.8rem; }
  .card-grid-2,
  .card-grid-3,
  .card-grid-4,
  .card-grid-5,
  .card-grid-6 {
    grid-template-columns: 1fr;
  }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
}