/* ============================================
   茂途 AI 智能客服 - 主样式表
   Author: Deven
   Version: v1.0
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  /* Brand Colors - 蓝色商务风 */
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-primary-light: #3B82F6;
  --color-secondary: #0EA5E9;
  --color-accent: #10B981;

  /* Neutral Colors */
  --color-text: #1F2937;
  --color-text-secondary: #6B7280;
  --color-text-light: #9CA3AF;
  --color-bg: #FFFFFF;
  --color-bg-soft: #F9FAFB;
  --color-bg-tinted: #F3F4F6;
  --color-bg-alt: #F8FAFC;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;

  /* Status Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* TODO Marker Color */
  --color-todo: #F59E0B;
  --color-todo-bg: #FEF3C7;
  --color-todo-border: #FCD34D;

  /* 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;
  --space-5xl: 8rem;

  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  /* Sizes */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 1.875rem;
  --fs-4xl: 2.25rem;
  --fs-5xl: 3rem;
  --fs-6xl: 3.75rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

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

a:hover {
  color: var(--color-primary-dark);
}

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

ul, ol {
  list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2rem, 5vw, var(--fs-6xl));
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.75rem, 4vw, var(--fs-5xl));
  letter-spacing: -0.015em;
}

h3 {
  font-size: clamp(1.375rem, 3vw, var(--fs-3xl));
}

h4 {
  font-size: var(--fs-xl);
}

p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-4xl) 0;
}

.section-sm {
  padding: var(--space-3xl) 0;
}

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

.section-header h2 {
  margin-bottom: var(--space-md);
}

.section-header p {
  font-size: var(--fs-lg);
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--fs-xl);
  color: var(--color-text);
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.nav-menu a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: var(--fs-base);
  transition: color var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-primary);
}

.nav-cta {
  padding: 0.625rem 1.25rem;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--fs-sm);
  transition: background var(--transition);
}

.nav-cta:hover {
  background: var(--color-primary-dark);
  color: white;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.875rem 1.75rem;
  font-weight: 600;
  font-size: var(--fs-base);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: white;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary-light);
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.08);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: #EFF6FF;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  padding: 0.5rem 1rem;
}

.btn-ghost:hover {
  color: var(--color-primary);
}

.btn-lg {
  padding: 1.125rem 2.25rem;
  font-size: var(--fs-lg);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: var(--space-5xl) 0 var(--space-4xl);
  background: linear-gradient(135deg, #EFF6FF 0%, #F0F9FF 50%, #FFFFFF 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

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

.hero-content h1 {
  margin-bottom: var(--space-lg);
}

.hero-content h1 .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--fs-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 540px;
}

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

.hero-visual {
  position: relative;
}

.hero-mockup {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

/* Page Hero (smaller) */
.page-hero {
  padding: var(--space-4xl) 0 var(--space-3xl);
  background: linear-gradient(135deg, #EFF6FF 0%, #FFFFFF 100%);
  text-align: center;
}

.page-hero h1 {
  margin-bottom: var(--space-md);
}

.page-hero p {
  font-size: var(--fs-lg);
  max-width: 720px;
  margin: 0 auto;
}

/* ---------- Cards ---------- */
.card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: all var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #DBEAFE, #E0F2FE);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card h3 {
  margin-bottom: var(--space-sm);
  font-size: var(--fs-xl);
}

.card p {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.feature-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

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

/* ---------- Section: Why Us ---------- */
.why-us {
  background: var(--color-bg-soft);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-xl);
}

.why-item {
  background: white;
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.why-item-number {
  display: inline-block;
  font-size: var(--fs-3xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-sm);
}

.why-item h3 {
  font-size: var(--fs-lg);
  margin-bottom: var(--space-sm);
}

.why-item p {
  font-size: var(--fs-sm);
}

/* ---------- CTA Section ---------- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  text-align: center;
  padding: var(--space-5xl) 0;
}

.cta-section h2 {
  color: white;
  margin-bottom: var(--space-md);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--fs-lg);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-section .btn-primary {
  background: white;
  color: var(--color-primary);
}

.cta-section .btn-primary:hover {
  background: var(--color-bg-soft);
  color: var(--color-primary-dark);
}

.cta-section .btn-secondary {
  background: transparent;
  color: white;
  border-color: rgba(255, 255, 255, 0.4);
}

.cta-section .btn-secondary:hover {
  border-color: white;
  color: white;
  background: rgba(255, 255, 255, 0.1);
}

.cta-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Industry Solutions ---------- */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-lg);
}

.industry-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.industry-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.industry-card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #DBEAFE, #E0F2FE);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
}

.industry-card-icon svg {
  width: 28px;
  height: 28px;
}

.industry-card h3 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-md);
}

.industry-pain,
.industry-solution {
  margin-top: var(--space-md);
}

.industry-pain h4,
.industry-solution h4 {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.industry-pain ul,
.industry-solution ul {
  list-style: none;
  padding: 0;
}

.industry-pain li,
.industry-solution li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--space-xs);
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  line-height: 1.6;
}

.industry-pain li::before {
  content: '✗';
  position: absolute;
  left: 0;
  color: var(--color-error);
  font-weight: 700;
}

.industry-solution li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

/* ---------- Product Detail ---------- */
.product-detail {
  padding: var(--space-3xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.product-detail:last-child {
  border-bottom: none;
}

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

.product-detail.reverse .product-detail-inner {
  direction: rtl;
}

.product-detail.reverse .product-detail-content,
.product-detail.reverse .product-detail-visual {
  direction: ltr;
}

.product-detail-content h2 {
  margin-bottom: var(--space-md);
  font-size: var(--fs-4xl);
}

.product-detail-content p {
  margin-bottom: var(--space-md);
  font-size: var(--fs-base);
}

.product-detail-content ul {
  list-style: none;
  padding: 0;
}

.product-detail-content li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  line-height: 1.7;
}

.product-detail-content li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 16px;
  height: 16px;
  background: var(--color-success);
  border-radius: 50%;
  background-image: url("../assets/icons/check.svg");
  background-size: contain;
}

.product-detail-visual {
  background: linear-gradient(135deg, #F0F9FF, #DBEAFE);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
}

/* ---------- Cases ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.case-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition);
}

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

.case-card-image {
  height: 180px;
  background: linear-gradient(135deg, #DBEAFE, #E0F2FE);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

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

.case-card .case-industry {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.case-card h3 {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-sm);
}

.case-card p {
  font-size: var(--fs-sm);
  margin-bottom: var(--space-md);
}

.case-result {
  background: var(--color-bg-soft);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}

.case-result-label {
  font-size: var(--fs-xs);
  color: var(--color-text-light);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.case-result-value {
  color: var(--color-text);
  font-weight: 700;
  font-size: var(--fs-base);
}

/* ---------- About / Cert ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-content h2 {
  margin-bottom: var(--space-md);
}

.about-content p {
  font-size: var(--fs-base);
  margin-bottom: var(--space-md);
}

.cert-card {
  background: white;
  border: 2px solid var(--color-primary-light);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  position: relative;
  box-shadow: var(--shadow-lg);
}

.cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.cert-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: linear-gradient(135deg, #FEF3C7, #FDE68A);
  color: #92400E;
  font-weight: 700;
  font-size: var(--fs-sm);
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.cert-card h3 {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.cert-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-md) 0;
  border-bottom: 1px dashed var(--color-border);
}

.cert-row:last-child {
  border-bottom: none;
}

.cert-row-label {
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  font-weight: 500;
}

.cert-row-value {
  color: var(--color-text);
  font-weight: 600;
  font-size: var(--fs-sm);
  text-align: right;
  max-width: 60%;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-3xl);
}

.contact-info-card {
  background: linear-gradient(135deg, #EFF6FF, #DBEAFE);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  height: fit-content;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-info-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.contact-info-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.contact-info-icon svg {
  width: 20px;
  height: 20px;
}

.contact-info-item h4 {
  font-size: var(--fs-sm);
  color: var(--color-text-light);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.contact-info-item p,
.contact-info-item a {
  color: var(--color-text);
  font-weight: 600;
  font-size: var(--fs-base);
}

/* ---------- Form ---------- */
.form-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--space-lg);
}

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

.form-label {
  display: block;
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.form-label .required {
  color: var(--color-error);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: var(--fs-base);
  color: var(--color-text);
  background: white;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-submit {
  width: 100%;
  padding: 1rem;
  font-size: var(--fs-lg);
}

/* ---------- Footer ---------- */
.footer {
  background: #0F172A;
  color: #CBD5E1;
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand {
  margin-bottom: var(--space-md);
}

.footer-brand .nav-logo {
  color: white;
  margin-bottom: var(--space-md);
}

.footer-brand p {
  color: #94A3B8;
  font-size: var(--fs-sm);
  max-width: 320px;
}

.footer-col h4 {
  color: white;
  font-size: var(--fs-base);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-col a {
  color: #94A3B8;
  font-size: var(--fs-sm);
  transition: color var(--transition);
}

.footer-col a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #1E293B;
  padding-top: var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-copyright {
  font-size: var(--fs-sm);
  color: #64748B;
}

.footer-legal {
  display: flex;
  gap: var(--space-lg);
  font-size: var(--fs-sm);
}

.footer-legal a {
  color: #64748B;
}

.footer-legal a:hover {
  color: #CBD5E1;
}

/* ---------- TODO Markers (CRITICAL - 醒目标记需要用户提供的信息) ---------- */
.todo {
  display: inline-block;
  background: transparent;
  color: #B45309;
  border: 2px dashed #D97706;
  padding: 0.125rem 0.5rem;
  border-radius: 3px;
  font-size: 0.8125em;
  font-weight: 700;
  font-family: var(--font-mono);
  cursor: help;
  white-space: nowrap;
  line-height: 1.6;
  vertical-align: baseline;
}

.todo-block {
  display: block;
  background: #FFFBEB;
  color: #92400E;
  border: 2px dashed #D97706;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-size: var(--fs-sm);
  font-weight: 500;
  margin: var(--space-md) 0;
  line-height: 1.6;
}

.todo-block::before {
  content: '⚠ 待提供：';
  font-weight: 800;
  color: #B45309;
  margin-right: 0.25rem;
}

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mt-0 { margin-top: 0; }
.mt-xl { margin-top: var(--space-xl); }

/* ---------- Animations ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms ease, transform 600ms ease;
}

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

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    gap: 0;
  }

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

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

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

  .nav-toggle {
    display: flex;
  }

  .hero-inner,
  .product-detail-inner,
  .contact-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .product-detail.reverse .product-detail-inner {
    direction: ltr;
  }

  .feature-grid-3,
  .feature-grid-2 {
    grid-template-columns: 1fr;
  }

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

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .industry-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

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

  .hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

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

  .btn {
    width: 100%;
  }
}

/* ---------- Print ---------- */
@media print {
  .nav, .footer, .cta-section, .nav-toggle {
    display: none;
  }
}