/* ==========================================================
   AI-OPS 智能物流管理系统 — 主样式表
   Design: Modern minimal, clean, professional
   ========================================================== */

/* ===== CSS Custom Properties ===== */
:root {
  /* Colors */
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-bg-card: #ffffff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #ffffff;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-light: #eff6ff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-hero: linear-gradient(180deg, #eff6ff 0%, #ffffff 40%);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --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, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);

  /* Layout */
  --max-width: 1200px;
  --nav-height: 68px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, textarea {
  font: inherit;
}

/* ===== Skip Link (Accessibility) ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  z-index: 10000;
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* ===== Section ===== */
section {
  padding: var(--space-4xl) 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-3xl);
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.3em 1em;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-bg-dark);
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Navigation ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-light);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-bg-dark);
  transition: opacity var(--transition-fast);
}

.nav-logo:hover {
  opacity: 0.8;
}

.logo-text {
  letter-spacing: -0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
  color: var(--color-text);
}

.nav-lang {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text-secondary) !important;
  transition: all var(--transition-fast);
}

.nav-lang:hover {
  border-color: var(--color-primary);
  color: var(--color-primary) !important;
  background: var(--color-primary-light);
}

.nav-cta {
  background: var(--color-bg-dark) !important;
  color: var(--color-text-inverse) !important;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 600 !important;
  transition: background var(--transition-fast), transform var(--transition-fast) !important;
}

.nav-cta:hover {
  background: var(--color-primary) !important;
  transform: translateY(-1px);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
}

.hamburger::before {
  transform: translateY(-5px);
}

.hamburger::after {
  transform: translateY(5px);
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
  background: var(--gradient-hero);
  padding-top: calc(var(--space-4xl) + var(--space-xl));
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-badge {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.hero-content h1 {
  font-size: clamp(2.25rem, 6vw, 3.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-bg-dark);
  margin-bottom: var(--space-lg);
}

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

.hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 540px;
  margin-bottom: var(--space-xl);
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  border-color: var(--color-text);
  background: var(--color-bg-alt);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: var(--space-2xl);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-bg-dark);
  line-height: 1.2;
}

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

/* Hero Visual (Abstract illustration) */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-illustration {
  position: relative;
  width: 340px;
  height: 340px;
}

.illustration-box {
  position: absolute;
  border-radius: var(--radius-lg);
  opacity: 0.85;
}

.box-1 {
  width: 160px;
  height: 160px;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  top: 0;
  left: 20%;
  animation: float 6s ease-in-out infinite;
}

.box-2 {
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, #8b5cf6, #a855f7);
  bottom: 10%;
  right: 10%;
  animation: float 6s ease-in-out 1s infinite;
  border-radius: var(--radius-xl);
}

.box-3 {
  width: 90px;
  height: 90px;
  background: linear-gradient(135deg, #ec4899, #f43f5e);
  top: 50%;
  right: 25%;
  animation: float 6s ease-in-out 2s infinite;
  border-radius: 50%;
}

.illustration-line {
  position: absolute;
  background: var(--color-border);
  border-radius: 2px;
}

.line-1 {
  width: 100px;
  height: 3px;
  top: 30%;
  left: 10%;
  transform: rotate(-15deg);
  animation: pulse-line 3s ease-in-out infinite;
}

.line-2 {
  width: 80px;
  height: 3px;
  bottom: 30%;
  right: 15%;
  transform: rotate(10deg);
  animation: pulse-line 3s ease-in-out 0.5s infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes pulse-line {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.7; }
}

/* ===== Hero: Badge Row & Stat Unit ===== */
.hero-badge-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-lg);
}

.hero-badge-foundation {
  background: rgba(15, 23, 42, 0.06);
  color: var(--color-bg-dark);
}

.stat-unit {
  font-size: 0.45em;
  font-weight: 600;
  opacity: 0.6;
  margin-left: 0.1em;
}

/* ===== Hero Visual: Extra Elements ===== */
.box-4 {
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, #10b981, #06b6d4);
  top: 15%;
  right: 5%;
  animation: float 6s ease-in-out 1.5s infinite;
  border-radius: var(--radius-md);
}

.line-3 {
  width: 60px;
  height: 3px;
  top: 55%;
  left: 40%;
  transform: rotate(25deg);
  animation: pulse-line 3s ease-in-out 1s infinite;
}

/* ===== AI Agents Section ===== */
.ai-agents {
  background: var(--color-bg);
}

.ai-agents-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.ai-agent-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

.ai-agent-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.ai-agent-featured {
  grid-column: 1 / -1;
  border-color: var(--color-primary);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.03) 0%, rgba(139, 92, 246, 0.03) 100%);
}

.ai-agent-badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-text-inverse);
  background: var(--color-primary);
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.ai-agent-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.ai-agent-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
  line-height: 1;
}

.ai-agent-header h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-bg-dark);
  margin-bottom: var(--space-xs);
}

.ai-agent-tagline {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.ai-agent-desc {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

/* AI Agent Capabilities (SOP card) */
.ai-agent-capabilities {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding: var(--space-lg);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
}

.ai-cap-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.ai-cap-cat {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

.ai-cap-item {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  padding-left: var(--space-md);
  position: relative;
}

.ai-cap-item::before {
  content: "·";
  position: absolute;
  left: 2px;
  color: var(--color-primary);
  font-weight: 700;
}

/* Before/After compare in SOP card */
.ai-agent-compare {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-dark);
  border-radius: var(--radius-md);
  color: var(--color-text-inverse);
  font-size: 0.85rem;
}

.ai-compare-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.15rem;
  opacity: 0.6;
}

.ai-compare-before,
.ai-compare-after {
  flex: 1;
  min-width: 0;
}

.ai-compare-before .ai-compare-label { color: var(--color-danger); opacity: 1; }
.ai-compare-after .ai-compare-label { color: var(--color-success); opacity: 1; }

.ai-compare-arrow {
  font-size: 1.5rem;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

/* AI Agent Highlights (tags) */
.ai-agent-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.ai-agent-highlights span {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

/* AI Agent Regions */
.ai-agent-regions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  padding: var(--space-md);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
}

.ai-region {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  font-size: 0.85rem;
}

.ai-region strong {
  font-size: 0.85rem;
  color: var(--color-bg-dark);
  white-space: nowrap;
}

.ai-region span {
  color: var(--color-text-secondary);
  font-size: 0.82rem;
}

/* AI Agent Note */
.ai-agent-note {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: var(--space-sm);
}

/* ===== Foundation Section ===== */
.foundation {
  background: var(--color-bg-alt);
}

.foundation-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.foundation-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: transform var(--transition-base);
}

.foundation-card:hover {
  transform: translateY(-2px);
}

.foundation-icon {
  font-size: 1.8rem;
  margin-bottom: var(--space-md);
}

.foundation-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-bg-dark);
}

.foundation-card p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Foundation Before/After Comparison */
.foundation-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  max-width: 860px;
  margin: 0 auto;
}

.foundation-compare-card {
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
}

.foundation-compare-before {
  background: #fef2f2;
  border: 1px solid #fecaca;
}

.foundation-compare-after {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
}

.foundation-compare-header {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  text-align: center;
}

.foundation-compare-before .foundation-compare-header {
  color: #b91c1c;
}

.foundation-compare-after .foundation-compare-header {
  color: #047857;
}

.foundation-compare-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.foundation-compare-card li {
  font-size: 0.9rem;
  line-height: 1.6;
  padding-left: var(--space-lg);
  position: relative;
}

.foundation-compare-card li::before {
  position: absolute;
  left: 0;
  font-weight: 700;
}

.foundation-compare-before li {
  color: #7f1d1d;
}

.foundation-compare-before li::before {
  content: "✕";
  color: #ef4444;
}

.foundation-compare-after li {
  color: #064e3b;
}

.foundation-compare-after li::before {
  content: "✓";
  color: #10b981;
}

/* ===== Features ===== */
.features {
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  display: inline-block;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-bg-dark);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Modules ===== */
.modules {
  background: var(--color-bg-alt);
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.module-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.module-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.module-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.module-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
}

.module-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-bg-dark);
}

.module-card > p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.module-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.module-tags li {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

/* ===== Advantages ===== */
.advantages {
  background: var(--color-bg);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl) var(--space-2xl);
}

.advantage-item {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.advantage-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.3;
  line-height: 1;
  flex-shrink: 0;
  width: 48px;
}

.advantage-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-bg-dark);
  margin-bottom: var(--space-sm);
}

.advantage-content p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Quick Start (HowTo) ===== */
.quickstart {
  background: var(--color-bg-alt);
}

.quickstart-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: 720px;
  margin: 0 auto;
}

.qs-step {
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: box-shadow var(--transition-base);
}

.qs-step:hover {
  box-shadow: var(--shadow-md);
}

.qs-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: var(--color-text-inverse);
  font-size: 1.25rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.qs-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-bg-dark);
  margin-bottom: var(--space-sm);
}

.qs-content p {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Compare Table ===== */
.compare {
  background: var(--color-bg);
}

.compare-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 860px;
  margin: 0 auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.compare-table th {
  text-align: left;
  padding: var(--space-md) var(--space-lg);
  font-weight: 700;
  color: var(--color-bg-dark);
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

.compare-table td {
  padding: var(--space-md) var(--space-lg);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
  line-height: 1.6;
}

.compare-table td:first-child {
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

.compare-highlight {
  color: var(--color-primary) !important;
  font-weight: 600 !important;
}

.compare-highlight:first-child,
.compare-table th.compare-highlight {
  color: var(--color-primary) !important;
}

@media (max-width: 768px) {
  .qs-step {
    flex-direction: column;
    gap: var(--space-md);
    padding: var(--space-lg);
  }

  .compare-table th,
  .compare-table td {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.82rem;
  }
}

/* ===== FAQ ===== */
.faq {
  background: var(--color-bg-alt);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--color-primary);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-lg);
  cursor: pointer;
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--color-bg-dark);
  list-style: none;
  user-select: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
  transition: transform var(--transition-fast);
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: var(--color-text-muted);
  transition: transform var(--transition-base);
}

.faq-icon::before {
  width: 12px;
  height: 2px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-icon::after {
  width: 2px;
  height: 12px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-item[open] .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-answer {
  padding: 0 var(--space-lg) var(--space-lg);
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== CTA / Contact ===== */
.cta {
  background: var(--color-bg);
}

.cta-card {
  background: var(--color-bg-dark);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  color: var(--color-text-inverse);
  max-width: 720px;
  margin: 0 auto;
}

.cta-card h2 {
  text-align: center;
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.cta-card > p {
  text-align: center;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-2xl);
}

/* QR row: two cards side by side below form */
.qr-row {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.qr-row .wecom-card {
  flex: 1;
  min-width: 0;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.qr-row .wecom-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-inverse);
}

.qr-row .wecom-card > p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: var(--space-sm);
}

.qr-row .wecom-qr {
  width: 100%;
  max-width: 207px;
  height: auto;
  border-radius: var(--radius-sm);
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.qr-row .wecom-hint {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  margin-top: var(--space-xs);
}

.cta-form {
  text-align: left;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.form-field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
}

.form-field label span {
  color: var(--color-danger);
}

.form-field input,
.form-field textarea {
  padding: 0.7rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-inverse);
  font-size: 0.92rem;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: rgba(255, 255, 255, 0.12);
}

.form-field textarea {
  resize: vertical;
  min-height: 80px;
}

.cta-form .btn {
  margin-top: var(--space-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.cta-form .btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-2xl);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.footer-desc {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.55);
  max-width: 280px;
  line-height: 1.7;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.footer-nav-group h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-md);
  color: rgba(255, 255, 255, 0.6);
}

.footer-nav-group li {
  margin-bottom: var(--space-sm);
}

.footer-nav-group a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-fast);
}

.footer-nav-group a:hover {
  color: rgba(255, 255, 255, 0.9);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-lg);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.35);
}

.footer-icp {
  margin-top: var(--space-sm);
}

.footer-icp a {
  color: rgba(255, 255, 255, 0.35);
  transition: color var(--transition-fast);
}

.footer-icp a:hover {
  color: rgba(255, 255, 255, 0.65);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-badge-row {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

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

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

  .qr-row {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  section {
    padding: var(--space-3xl) 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-lg);
    gap: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-110%);
    opacity: 0;
    transition: transform var(--transition-base), opacity var(--transition-base);
    pointer-events: none;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu a {
    display: block;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
  }

  .nav-menu a:hover {
    background: var(--color-bg-alt);
  }

  .nav-cta {
    text-align: center;
    margin-top: var(--space-sm);
  }

  .features-grid,
  .modules-grid,
  .advantages-grid,
  .ai-agents-grid,
  .foundation-grid,
  .foundation-compare {
    grid-template-columns: 1fr;
  }

  .ai-agent-featured {
    grid-column: auto;
  }

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

  .ai-agent-compare {
    flex-direction: column;
    text-align: center;
  }

  .ai-agent-compare .ai-compare-arrow {
    transform: rotate(90deg);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

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

  .hero-stats {
    gap: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .hero-stats {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-lg);
  }

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

  .cta-card {
    padding: var(--space-xl);
  }

  .qr-row {
    flex-direction: column;
  }

  .footer-nav {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* ===== Print Styles ===== */
@media print {
  .site-header,
  .site-footer,
  .cta-form,
  .nav-toggle {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
  }

  section {
    padding: 1rem 0;
    page-break-inside: avoid;
  }
}

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

  html {
    scroll-behavior: auto;
  }
}