/* ============================================
   哎呀李好 - GEO优化官网样式系统
   Brand: 深蓝+靛蓝渐变，AI科技感
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-bg-dark-alt: #1e293b;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-on-dark: #f1f5f9;
  --color-text-on-dark-muted: #94a3b8;
  --color-primary: #4f46e5;
  --color-primary-light: #6366f1;
  --color-primary-dark: #3730a3;
  --color-accent: #06b6d4;
  --color-accent-light: #22d3ee;
  --color-border: #e2e8f0;
  --color-border-dark: #334155;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
  --gradient-cta: linear-gradient(135deg, #4f46e5, #06b6d4);
  --gradient-card: linear-gradient(135deg, rgba(79,70,229,0.05), rgba(6,182,212,0.05));
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

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

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-primary-light); }
ul, ol { list-style: none; }

/* ---------- Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section--dark {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

.section--alt {
  background: var(--color-bg-alt);
}

.section__label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: rgba(79,70,229,0.08);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 12px;
}

.section--dark .section__label {
  color: var(--color-accent-light);
  background: rgba(6,182,212,0.12);
}

.section__title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--color-text);
}

.section--dark .section__title {
  color: var(--color-text-on-dark);
}

.section__desc {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 640px;
  line-height: 1.8;
}

.section--dark .section__desc {
  color: var(--color-text-on-dark-muted);
}

.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ---------- Header / Navigation ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: background 0.3s, box-shadow 0.3s;
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

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

.header__logo {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header__logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-cta);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 800;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header__nav a {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}

.header__nav a:hover,
.header__nav a.active {
  color: var(--color-primary);
  background: rgba(79,70,229,0.06);
}

.header__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--gradient-cta);
  color: #fff !important;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.header__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79,70,229,0.4);
  color: #fff !important;
}

/* Mobile menu toggle */
.header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}

.header__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s;
}

/* ---------- Hero Section ---------- */
.hero {
  padding: 160px 0 100px;
  background: var(--gradient-hero);
  color: var(--color-text-on-dark);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(99,102,241,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(6,182,212,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.25);
  color: var(--color-accent-light);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero__title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

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

.hero__desc {
  font-size: 1.1875rem;
  line-height: 1.8;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 36px;
  max-width: 560px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero__platforms {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.hero__platforms-label {
  font-size: 0.8125rem;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hero__platform-list {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.hero__platform-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
  color: var(--color-text-on-dark-muted);
}

.hero__platform-item .emoji {
  font-size: 1.25rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  text-decoration: none;
  line-height: 1.5;
}

.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: var(--gradient-cta);
  color: #fff;
  box-shadow: 0 4px 14px rgba(79,70,229,0.35);
}

.btn--primary:hover {
  box-shadow: 0 6px 20px rgba(79,70,229,0.5);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--color-text-on-dark);
  border: 1px solid rgba(255,255,255,0.2);
}

.btn--outline:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.3);
  color: var(--color-text-on-dark);
}

.btn--outline-light {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn--outline-light:hover {
  background: rgba(79,70,229,0.06);
  color: var(--color-primary);
}

.btn--sm {
  font-size: 0.8125rem;
  padding: 8px 18px;
}

.btn--lg {
  font-size: 1.0625rem;
  padding: 14px 36px;
}

/* ---------- Service Cards ---------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.service-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.3s, box-shadow 0.3s;
}

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

.section--dark .service-card {
  background: var(--color-bg-dark-alt);
  border-color: var(--color-border-dark);
}

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

.section--dark .service-card__icon {
  background: rgba(99,102,241,0.12);
}

.service-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text);
}

.section--dark .service-card__title {
  color: var(--color-text-on-dark);
}

.service-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.section--dark .service-card__desc {
  color: var(--color-text-on-dark-muted);
}

/* ---------- Process Steps ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
  counter-reset: step;
}

.process-step {
  position: relative;
  padding: 32px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  counter-increment: step;
}

.process-step::before {
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--gradient-cta);
  color: #fff;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: 50%;
  margin-bottom: 16px;
}

.section--dark .process-step {
  background: var(--color-bg-dark-alt);
  border-color: var(--color-border-dark);
}

.process-step__title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.section--dark .process-step__title {
  color: var(--color-text-on-dark);
}

.process-step__desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.section--dark .process-step__desc {
  color: var(--color-text-on-dark-muted);
}

/* ---------- Stats ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.stat-item {
  text-align: center;
  padding: 32px 16px;
}

.stat-item__value {
  font-size: 2.75rem;
  font-weight: 800;
  background: var(--gradient-cta);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 8px;
}

.stat-item__label {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.section--dark .stat-item__label {
  color: var(--color-text-on-dark-muted);
}

/* ---------- Case Cards ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.case-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.3s, box-shadow 0.3s;
}

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

.case-card__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(79,70,229,0.08);
  color: var(--color-primary);
  margin-bottom: 16px;
}

.case-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text);
}

.case-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 20px;
  line-height: 1.7;
}

.case-card__metrics {
  display: flex;
  gap: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.case-card__metric strong {
  display: block;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
}

.case-card__metric span {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

/* ---------- CTA Section ---------- */
.cta-section {
  padding: 80px 0;
  background: var(--gradient-hero);
  color: var(--color-text-on-dark);
  text-align: center;
}

.cta-section__title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-section__desc {
  font-size: 1.125rem;
  color: var(--color-text-on-dark-muted);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.8;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 800px;
  margin: 48px auto 0;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  text-align: left;
  line-height: 1.5;
  transition: background 0.2s;
}

.faq-item__question:hover {
  background: var(--color-bg-alt);
}

.faq-item__question::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-left: 16px;
  transition: transform 0.3s;
}

.faq-item.open .faq-item__question::after {
  content: '−';
}

.faq-item__answer {
  display: none;
  padding: 0 24px 20px;
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

.faq-item.open .faq-item__answer {
  display: block;
}

/* ---------- Content Page ---------- */
.page-hero {
  padding: 140px 0 60px;
  background: var(--gradient-hero);
  color: var(--color-text-on-dark);
}

.page-hero__title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.page-hero__desc {
  font-size: 1.125rem;
  color: var(--color-text-on-dark-muted);
  max-width: 640px;
  line-height: 1.8;
}

.page-content {
  padding: 60px 0 80px;
}

.page-content__inner {
  max-width: 800px;
  margin: 0 auto;
}

.page-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 48px 0 16px;
  padding-top: 16px;
}

.page-content h3 {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 32px 0 12px;
}

.page-content p {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.9;
  margin-bottom: 16px;
}

.page-content ul, .page-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

.page-content ul { list-style: disc; }
.page-content ol { list-style: decimal; }

.page-content li {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 8px;
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9375rem;
}

.page-content th, .page-content td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.page-content th {
  font-weight: 600;
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.page-content td {
  color: var(--color-text);
}

.page-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 16px 24px;
  margin: 24px 0;
  background: var(--color-bg-alt);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-text-light);
}

.page-content .callout {
  background: rgba(79,70,229,0.06);
  border: 1px solid rgba(79,70,229,0.15);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 24px 0;
}

.page-content .callout__title {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  margin-bottom: 20px;
  color: var(--color-text-on-dark-muted);
}

.breadcrumb a {
  color: var(--color-accent-light);
}

.breadcrumb span {
  color: var(--color-text-on-dark-muted);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  padding: 60px 0 0;
}

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

.footer__brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer__brand-desc {
  font-size: 0.9rem;
  color: var(--color-text-on-dark-muted);
  line-height: 1.7;
  max-width: 320px;
}

.footer__col-title {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
  color: var(--color-text-on-dark);
}

.footer__col a {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text-on-dark-muted);
  padding: 4px 0;
  transition: color 0.2s;
}

.footer__col a:hover {
  color: var(--color-accent-light);
}

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--color-text-on-dark-muted);
}

.footer__bottom a {
  color: var(--color-text-on-dark-muted);
}

.footer__bottom a:hover {
  color: var(--color-accent-light);
}

/* ---------- WeChat Modal ---------- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  position: relative;
  animation: modalIn 0.3s ease;
}

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

.modal__close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-light);
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

.modal__close:hover { color: var(--color-text); }

.modal__qr {
  width: 200px;
  height: 200px;
  margin: 0 auto 20px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  border: 2px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.modal__qr img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.modal__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.modal__desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ---------- Comparison Table ---------- */
.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 32px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.comparison-table th,
.comparison-table td {
  padding: 16px 20px;
  text-align: left;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table thead th {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  font-weight: 600;
  font-size: 0.9375rem;
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.comparison-table tbody tr:hover {
  background: var(--color-bg-alt);
}

.comparison-table td:first-child {
  font-weight: 600;
  color: var(--color-text);
  background: rgba(79,70,229,0.03);
  width: 20%;
}

/* ---------- Page Sidebar Nav ---------- */
.page-with-sidebar {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
}

.sidebar-nav {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-nav a {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-light);
  padding: 6px 12px;
  border-left: 2px solid transparent;
  margin-bottom: 4px;
  transition: all 0.2s;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: rgba(79,70,229,0.04);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .page-with-sidebar { grid-template-columns: 1fr; }
  .sidebar-nav { display: none; }
}

@media (max-width: 768px) {
  .header__nav { display: none; }
  .header__toggle { display: flex; }
  
  .header__nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    box-shadow: var(--shadow-lg);
  }

  .hero__title { font-size: 2.25rem; }
  .hero { padding: 130px 0 60px; }
  
  .section__title { font-size: 1.75rem; }
  .page-hero__title { font-size: 2rem; }
  
  .service-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: 8px; text-align: center; }
  
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; text-align: center; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .hero__platform-list { gap: 12px; }
  .section { padding: 60px 0; }
}