/* ========== 设计令牌系统 ========== */
:root {
  --color-primary-50: #eef2ff;
  --color-primary-100: #e0e7ff;
  --color-primary-200: #c7d2fe;
  --color-primary-300: #a5b4fc;
  --color-primary-400: #818cf8;
  --color-primary-500: #6366f1;
  --color-primary-600: #4f46e5;
  --color-primary-700: #4338ca;
  --color-primary-800: #3730a3;
  --color-primary-900: #312e81;
  --color-accent-400: #38bdf8;
  --color-accent-500: #0ea5e9;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;
  --color-neutral-950: #020617;
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 30%, #312e81 60%, #1e1b4b 100%);
  --gradient-card: linear-gradient(135deg, rgba(99,102,241,0.1) 0%, rgba(139,92,246,0.05) 100%);
  --gradient-text: linear-gradient(90deg, #818cf8, #a78bfa, #38bdf8);
  --gradient-btn: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-family-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 40px rgb(99 102 241 / 0.15);
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --container-max: 1280px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: var(--font-family-primary); font-size: var(--font-size-base); line-height: var(--line-height-normal); color: var(--color-neutral-800); background-color: #ffffff; overflow-x: hidden; }
a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
img { max-width: 100%; display: block; }

.container { width: 100%; max-width: var(--container-max); margin-left: auto; margin-right: auto; padding-left: var(--space-6); padding-right: var(--space-6); }

/* ========== 语言切换器 ========== */
.lang-switcher {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full);
  padding: 2px;
  position: relative;
}

.lang-btn {
  position: relative;
  z-index: 1;
  background: none;
  border: none;
  color: var(--color-neutral-400);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.lang-btn.active {
  color: #ffffff;
}

.lang-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  height: calc(100% - 4px);
  background: var(--color-primary-600);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  z-index: 0;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: 64px; display: flex; align-items: center;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(99, 102, 241, 0.1);
  transition: all var(--transition-normal);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.navbar-brand { display: flex; align-items: center; gap: var(--space-3); }
.navbar-logo { width: 36px; height: 36px; background: var(--gradient-primary); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; color: white; font-weight: var(--font-weight-bold); font-size: var(--font-size-lg); }
.navbar-title { color: #ffffff; font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); letter-spacing: -0.01em; }
.navbar-title .subtitle-zh { color: var(--color-primary-300); font-weight: var(--font-weight-normal); margin-left: var(--space-2); font-size: var(--font-size-sm); }
.navbar-title .subtitle-en { color: var(--color-primary-300); font-weight: var(--font-weight-normal); margin-left: var(--space-2); font-size: var(--font-size-sm); }
.navbar-nav { display: flex; align-items: center; gap: var(--space-1); }
.navbar-link { color: var(--color-neutral-300); font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); padding: var(--space-2) var(--space-4); border-radius: var(--radius-md); transition: all var(--transition-fast); }
.navbar-link:hover { color: #ffffff; background: rgba(255, 255, 255, 0.08); }
.navbar-link.active { color: #ffffff; background: rgba(99, 102, 241, 0.2); }
.navbar-actions { display: flex; align-items: center; gap: var(--space-3); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); font-family: var(--font-family-primary); font-weight: var(--font-weight-medium); font-size: var(--font-size-sm); padding: var(--space-2) var(--space-5); border-radius: var(--radius-md); border: none; cursor: pointer; transition: all var(--transition-fast); user-select: none; white-space: nowrap; }
.btn:focus-visible { outline: 2px solid var(--color-primary-400); outline-offset: 2px; }
.btn-ghost { background: transparent; color: var(--color-neutral-300); }
.btn-ghost:hover { color: #ffffff; background: rgba(255, 255, 255, 0.08); }
.btn-primary { background: var(--gradient-btn); color: #ffffff; box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4); }
.btn-outline { background: transparent; color: var(--color-primary-300); border: 1px solid rgba(99, 102, 241, 0.4); }
.btn-outline:hover { background: rgba(99, 102, 241, 0.1); border-color: var(--color-primary-400); color: #ffffff; }
.btn-lg { padding: var(--space-3) var(--space-8); font-size: var(--font-size-base); border-radius: var(--radius-lg); }
.btn-xl { padding: var(--space-4) var(--space-10); font-size: var(--font-size-lg); border-radius: var(--radius-xl); }

/* ========== Hero ========== */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; background: var(--gradient-hero); overflow: hidden; padding-top: 64px; }
.hero::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(ellipse at 30% 50%, rgba(99,102,241,0.12) 0%, transparent 50%), radial-gradient(ellipse at 70% 30%, rgba(139,92,246,0.08) 0%, transparent 50%), radial-gradient(ellipse at 50% 80%, rgba(56,189,248,0.06) 0%, transparent 40%); animation: heroGlow 15s ease-in-out infinite alternate; }
@keyframes heroGlow { 0% { transform: translate(0,0) rotate(0deg); } 100% { transform: translate(-3%,2%) rotate(3deg); } }
.hero::after { content: ''; position: absolute; inset: 0; background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%236366f1' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); opacity: 0.5; }
.hero .container { position: relative; z-index: 1; text-align: center; }
.hero-badge { display: inline-flex; align-items: center; gap: var(--space-2); background: rgba(99,102,241,0.15); border: 1px solid rgba(99,102,241,0.25); color: var(--color-primary-300); padding: var(--space-2) var(--space-4); border-radius: var(--radius-full); font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); margin-bottom: var(--space-8); animation: fadeInUp 0.6s ease-out; }
.hero-badge-dot { width: 8px; height: 8px; background: var(--color-success); border-radius: var(--radius-full); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.hero-title { font-size: var(--font-size-6xl); font-weight: var(--font-weight-bold); color: #ffffff; line-height: var(--line-height-tight); letter-spacing: -0.03em; margin-bottom: var(--space-6); animation: fadeInUp 0.6s ease-out 0.1s both; }
.hero-title-gradient { background: var(--gradient-text); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-subtitle { font-size: var(--font-size-xl); color: var(--color-neutral-400); max-width: 680px; margin: 0 auto var(--space-10); line-height: var(--line-height-relaxed); animation: fadeInUp 0.6s ease-out 0.2s both; }
.hero-actions { display: flex; align-items: center; justify-content: center; gap: var(--space-4); margin-bottom: var(--space-16); animation: fadeInUp 0.6s ease-out 0.3s both; }
.hero-stats { display: flex; align-items: center; justify-content: center; gap: var(--space-16); animation: fadeInUp 0.6s ease-out 0.4s both; }
.hero-stat { text-align: center; }
.hero-stat-value { font-size: var(--font-size-3xl); font-weight: var(--font-weight-bold); color: #ffffff; }
.hero-stat-value span { color: var(--color-primary-400); }
.hero-stat-label { font-size: var(--font-size-sm); color: var(--color-neutral-500); margin-top: var(--space-1); }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

/* ========== Section 通用 ========== */
.section { padding: var(--space-24) 0; }
.section-dark { background: var(--color-neutral-950); color: #ffffff; }
.section-light { background: #ffffff; }
.section-gray { background: var(--color-neutral-50); }
.section-header { text-align: center; max-width: 720px; margin: 0 auto var(--space-16); }
.section-eyebrow { display: inline-flex; align-items: center; gap: var(--space-2); font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); color: var(--color-primary-500); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-4); }
.section-dark .section-eyebrow { color: var(--color-primary-400); }
.section-title { font-size: var(--font-size-4xl); font-weight: var(--font-weight-bold); color: var(--color-neutral-900); line-height: var(--line-height-tight); letter-spacing: -0.02em; margin-bottom: var(--space-4); }
.section-dark .section-title { color: #ffffff; }
.section-desc { font-size: var(--font-size-lg); color: var(--color-neutral-500); line-height: var(--line-height-relaxed); }
.section-dark .section-desc { color: var(--color-neutral-400); }

/* ========== 页面Banner ========== */
.page-banner { position: relative; background: var(--gradient-hero); overflow: hidden; padding: 140px 0 80px; }
.page-banner::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(99,102,241,0.12) 0%, transparent 50%), radial-gradient(ellipse at 70% 30%, rgba(139,92,246,0.08) 0%, transparent 50%); }
.page-banner .container { position: relative; z-index: 1; text-align: center; }
.page-banner .section-eyebrow { color: var(--color-primary-400); }
.page-banner .section-title { color: #ffffff; font-size: var(--font-size-5xl); }
.page-banner .section-desc { color: var(--color-neutral-400); }

/* ========== 模型卡片 ========== */
.models-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.model-card { position: relative; background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-xl); padding: var(--space-8); transition: all var(--transition-normal); overflow: hidden; }
.model-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-primary); opacity: 0; transition: opacity var(--transition-normal); }
.model-card:hover { border-color: rgba(99,102,241,0.3); background: rgba(99,102,241,0.05); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.model-card:hover::before { opacity: 1; }
.model-card-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: var(--space-4); }
.model-card-icon { width: 48px; height: 48px; background: var(--gradient-card); border: 1px solid rgba(99,102,241,0.2); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; font-size: var(--font-size-2xl); }
.model-card-tag { font-size: var(--font-size-xs); font-weight: var(--font-weight-semibold); color: var(--color-primary-400); background: rgba(99,102,241,0.15); padding: var(--space-1) var(--space-3); border-radius: var(--radius-full); }
.model-card-tag.hot { color: #f97316; background: rgba(249,115,22,0.15); }
.model-card-tag.new { color: var(--color-success); background: rgba(16,185,129,0.15); }
.model-card-title { font-size: var(--font-size-xl); font-weight: var(--font-weight-semibold); color: #ffffff; margin-bottom: var(--space-2); }
.model-card-desc { font-size: var(--font-size-sm); color: var(--color-neutral-400); line-height: var(--line-height-relaxed); margin-bottom: var(--space-6); }
.model-card-specs { display: flex; gap: var(--space-4); padding-top: var(--space-4); border-top: 1px solid rgba(255,255,255,0.06); }
.model-spec { display: flex; flex-direction: column; gap: var(--space-1); }
.model-spec-value { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); color: var(--color-primary-300); }
.model-spec-label { font-size: var(--font-size-xs); color: var(--color-neutral-500); }

/* ========== 工具卡片 ========== */
.tools-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--space-6); }
.tool-card { background: #ffffff; border: 1px solid var(--color-neutral-200); border-radius: var(--radius-xl); padding: var(--space-8); text-align: center; transition: all var(--transition-normal); position: relative; overflow: hidden; }
.tool-card::after { content: ''; position: absolute; inset: 0; background: var(--gradient-card); opacity: 0; transition: opacity var(--transition-normal); pointer-events: none; }
.tool-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary-200); }
.tool-card:hover::after { opacity: 1; }
.tool-card-icon { position: relative; z-index: 1; width: 64px; height: 64px; margin: 0 auto var(--space-5); background: var(--color-primary-50); border-radius: var(--radius-xl); display: flex; align-items: center; justify-content: center; font-size: var(--font-size-3xl); transition: all var(--transition-normal); }
.tool-card:hover .tool-card-icon { background: var(--gradient-primary); transform: scale(1.05); }
.tool-card-title { position: relative; z-index: 1; font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); color: var(--color-neutral-800); margin-bottom: var(--space-2); }
.tool-card-desc { position: relative; z-index: 1; font-size: var(--font-size-sm); color: var(--color-neutral-500); line-height: var(--line-height-relaxed); }

/* ========== 优势 ========== */
.advantages-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.advantage-card { display: flex; gap: var(--space-6); background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-xl); padding: var(--space-8); transition: all var(--transition-normal); }
.advantage-card:hover { border-color: rgba(99,102,241,0.2); background: rgba(99,102,241,0.04); }
.advantage-icon { flex-shrink: 0; width: 56px; height: 56px; background: var(--gradient-card); border: 1px solid rgba(99,102,241,0.2); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; font-size: var(--font-size-2xl); }
.advantage-content h3 { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); color: #ffffff; margin-bottom: var(--space-2); }
.advantage-content p { font-size: var(--font-size-sm); color: var(--color-neutral-400); line-height: var(--line-height-relaxed); }

/* ========== 代码展示 ========== */
.code-showcase { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-12); align-items: center; }
.code-info h3 { font-size: var(--font-size-3xl); font-weight: var(--font-weight-bold); color: var(--color-neutral-900); margin-bottom: var(--space-4); line-height: var(--line-height-tight); }
.code-info p { font-size: var(--font-size-lg); color: var(--color-neutral-500); line-height: var(--line-height-relaxed); margin-bottom: var(--space-8); }
.code-features { display: flex; flex-direction: column; gap: var(--space-4); }
.code-feature { display: flex; align-items: center; gap: var(--space-3); font-size: var(--font-size-base); color: var(--color-neutral-700); }
.code-feature-check { width: 24px; height: 24px; background: rgba(16,185,129,0.1); color: var(--color-success); border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; font-size: var(--font-size-sm); flex-shrink: 0; }
.code-block { background: var(--color-neutral-900); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-xl); }
.code-block-header { display: flex; align-items: center; justify-content: space-between; padding: var(--space-3) var(--space-5); background: rgba(255,255,255,0.05); border-bottom: 1px solid rgba(255,255,255,0.06); }
.code-block-dots { display: flex; gap: var(--space-2); }
.code-block-dot { width: 12px; height: 12px; border-radius: var(--radius-full); }
.code-block-dot:nth-child(1) { background: #ef4444; }
.code-block-dot:nth-child(2) { background: #f59e0b; }
.code-block-dot:nth-child(3) { background: #10b981; }
.code-block-lang { font-size: var(--font-size-xs); color: var(--color-neutral-500); font-family: var(--font-family-mono); }
.code-block-body { padding: var(--space-6); font-family: var(--font-family-mono); font-size: var(--font-size-sm); line-height: 1.8; overflow-x: auto; }
.code-block-body .keyword { color: #c084fc; }
.code-block-body .string { color: #34d399; }
.code-block-body .comment { color: #64748b; }
.code-block-body .func { color: #60a5fa; }
.code-block-body .const { color: #f97316; }

/* ========== 定价 ========== */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.pricing-card { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-xl); padding: var(--space-8); transition: all var(--transition-normal); position: relative; }
.pricing-card.featured { border-color: var(--color-primary-500); background: rgba(99,102,241,0.08); }
.pricing-card .featured-tag-zh, .pricing-card .featured-tag-en { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--gradient-btn); color: #ffffff; font-size: var(--font-size-xs); font-weight: var(--font-weight-semibold); padding: var(--space-1) var(--space-4); border-radius: var(--radius-full); }
.pricing-card:hover { transform: translateY(-4px); }
.pricing-name { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); color: #ffffff; margin-bottom: var(--space-2); }
.pricing-price { font-size: var(--font-size-4xl); font-weight: var(--font-weight-bold); color: #ffffff; margin-bottom: var(--space-1); }
.pricing-price span { font-size: var(--font-size-base); font-weight: var(--font-weight-normal); color: var(--color-neutral-400); }
.pricing-period { font-size: var(--font-size-sm); color: var(--color-neutral-500); margin-bottom: var(--space-6); }
.pricing-features { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); margin-bottom: var(--space-8); }
.pricing-features li { display: flex; align-items: center; gap: var(--space-3); font-size: var(--font-size-sm); color: var(--color-neutral-300); }
.pricing-features li::before { content: '\2713'; color: var(--color-primary-400); font-weight: var(--font-weight-bold); flex-shrink: 0; }
.pricing-card .btn { width: 100%; }

/* ========== CTA ========== */
.cta-section { position: relative; background: var(--gradient-hero); overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at center, rgba(99,102,241,0.2) 0%, transparent 60%); }
.cta-content { position: relative; z-index: 1; text-align: center; }
.cta-title { font-size: var(--font-size-4xl); font-weight: var(--font-weight-bold); color: #ffffff; margin-bottom: var(--space-4); }
.cta-desc { font-size: var(--font-size-lg); color: var(--color-neutral-400); max-width: 560px; margin: 0 auto var(--space-8); }
.cta-actions { display: flex; align-items: center; justify-content: center; gap: var(--space-4); }

/* ========== Footer ========== */
.footer { background: var(--color-neutral-950); border-top: 1px solid rgba(255,255,255,0.06); padding: var(--space-16) 0 var(--space-8); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: var(--space-12); margin-bottom: var(--space-12); }
.footer-brand { max-width: 320px; }
.footer-brand-logo { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-4); }
.footer-brand-icon { width: 32px; height: 32px; background: var(--gradient-primary); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; color: white; font-weight: var(--font-weight-bold); font-size: var(--font-size-sm); }
.footer-brand-name { color: #ffffff; font-size: var(--font-size-base); font-weight: var(--font-weight-semibold); }
.footer-brand-desc { font-size: var(--font-size-sm); color: var(--color-neutral-500); line-height: var(--line-height-relaxed); margin-bottom: var(--space-6); }
.footer-social { display: flex; gap: var(--space-3); }
.footer-social-link { width: 36px; height: 36px; background: rgba(255,255,255,0.06); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; color: var(--color-neutral-400); font-size: var(--font-size-sm); transition: all var(--transition-fast); }
.footer-social-link:hover { background: rgba(99,102,241,0.2); color: var(--color-primary-400); }
.footer-col h4 { color: #ffffff; font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); margin-bottom: var(--space-4); }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col a { font-size: var(--font-size-sm); color: var(--color-neutral-500); transition: color var(--transition-fast); }
.footer-col a:hover { color: var(--color-primary-400); }
.footer-bottom { padding-top: var(--space-8); border-top: 1px solid rgba(255,255,255,0.06); display: flex; align-items: center; justify-content: space-between; }
.footer-copyright { font-size: var(--font-size-sm); color: var(--color-neutral-600); }
.footer-legal { display: flex; gap: var(--space-6); }
.footer-legal a { font-size: var(--font-size-sm); color: var(--color-neutral-600); }
.footer-legal a:hover { color: var(--color-neutral-400); }

/* ========== 悬浮 ========== */
.floating-widget { position: fixed; bottom: var(--space-8); right: var(--space-8); z-index: 999; }
.floating-btn { width: 56px; height: 56px; background: var(--gradient-btn); border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; color: #ffffff; font-size: var(--font-size-xl); box-shadow: 0 4px 20px rgba(99,102,241,0.4); cursor: pointer; border: none; transition: all var(--transition-fast); }
.floating-btn:hover { transform: scale(1.1); box-shadow: 0 6px 28px rgba(99,102,241,0.5); }

/* ========== 动画 ========== */
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: all 0.7s cubic-bezier(0.4,0,0.2,1); }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .models-grid { grid-template-columns: repeat(2, 1fr); }
  .tools-grid { grid-template-columns: repeat(3, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .code-showcase { grid-template-columns: 1fr; gap: var(--space-8); }
  .footer-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .hero-title { font-size: var(--font-size-4xl); }
  .hero-subtitle { font-size: var(--font-size-base); }
  .hero-actions { flex-direction: column; }
  .hero-stats { flex-direction: column; gap: var(--space-8); }
  .navbar-nav { display: none; }
  .models-grid { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .section-title { font-size: var(--font-size-3xl); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .page-banner .section-title { font-size: var(--font-size-3xl); }
}
@media (max-width: 480px) {
  .tools-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ========== 无障碍动画 ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}