/* ============================================================
   DeepSeek 说明落地页 - 江南蚕匾风设计规范
   色彩：桑叶翠绿 (#2D7D46, #1E5B32) + 竹匾嫩竹 (#78A55A, #8FB86E) + 吐丝蚕白 (#F8FAF6, #FFFFFF) + 桑椹深黛 (#1F2922)
   骨架：竹匾编织外框、S形蚕食啃食轨迹、桑叶脉络分层、克制说明书
   ============================================================ */

:root {
  --primary-mulberry-green: #2D7D46;
  --primary-mulberry-dark: #1E5B32;
  --primary-mulberry-leaf: #3D9957;
  --accent-bamboo: #78A55A;
  --accent-bamboo-light: #8FB86E;
  --accent-silk-gold: #C2A649;
  --bg-silk: #F8FAF6;
  --bg-silk-warm: #EFF4EB;
  --bg-card: #FFFFFF;
  --text-dark: #1F2922;
  --text-muted: #536657;
  --text-light: #829686;
  --border-bamboo: #DCE7D6;
  --border-tray: #C8DAC0;
  --shadow-sm: 0 2px 8px rgba(31, 41, 34, 0.05);
  --shadow-md: 0 6px 20px rgba(31, 41, 34, 0.08);
  --shadow-lg: 0 12px 32px rgba(31, 41, 34, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-tray: 24px;
  --container-width: 1100px;
  --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
}

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

html {
  font-family: var(--font-family);
  background-color: var(--bg-silk);
  color: var(--text-dark);
  line-height: 1.68;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  width: 100%;
  overflow-x: hidden;
  background: 
    radial-gradient(circle at 12% 15%, rgba(45, 125, 70, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 88% 82%, rgba(120, 165, 90, 0.06) 0%, transparent 45%),
    var(--bg-silk);
}

a {
  color: var(--primary-mulberry-green);
  text-decoration: none;
  transition: all 0.2s ease;
}

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

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

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

/* ================== Header ================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 246, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--border-bamboo);
  transition: all 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  border: 1px solid var(--border-tray);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-dark);
  letter-spacing: 0.5px;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--primary-mulberry-green);
  font-weight: 600;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-dark);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary-mulberry-dark);
  background-color: rgba(45, 125, 70, 0.08);
}

.header-cta {
  background: linear-gradient(135deg, var(--primary-mulberry-green) 0%, var(--accent-bamboo) 100%);
  color: #FFFFFF !important;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 20px;
  box-shadow: 0 2px 8px rgba(45, 125, 70, 0.28);
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.header-cta:hover {
  background: linear-gradient(135deg, var(--primary-mulberry-dark) 0%, var(--primary-mulberry-green) 100%);
  box-shadow: 0 4px 12px rgba(45, 125, 70, 0.38);
}

/* ================== Hero Section ================== */
.hero-section {
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--border-bamboo);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero-left {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.hero-tag-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background-color: rgba(45, 125, 70, 0.1);
  color: var(--primary-mulberry-dark);
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 14px;
  border: 1px solid rgba(45, 125, 70, 0.25);
}

.hero-date {
  font-size: 0.78rem;
  color: var(--text-light);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.hero-h1 {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hero-h1-top {
  font-size: 1.25rem;
  color: var(--primary-mulberry-green);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.hero-h1-bottom {
  font-size: 2.25rem;
  line-height: 1.25;
  color: var(--text-dark);
  font-weight: 800;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 8px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary-mulberry-green) 0%, var(--accent-bamboo) 100%);
  color: #FFFFFF !important;
  padding: 13px 26px;
  border-radius: var(--radius-md);
  font-size: 0.98rem;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(45, 125, 70, 0.28);
  border: 1px solid transparent;
  transition: all 0.25s ease;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-mulberry-dark) 0%, var(--primary-mulberry-green) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(45, 125, 70, 0.38);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: #FFFFFF;
  color: var(--text-dark) !important;
  padding: 13px 24px;
  border-radius: var(--radius-md);
  font-size: 0.98rem;
  font-weight: 600;
  border: 1px solid var(--border-tray);
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  background-color: var(--bg-silk-warm);
  border-color: var(--primary-mulberry-green);
  transform: translateY(-2px);
}

/* 江南竹匾视觉卡片 (竹匾编织外框 + S形蚕食轨迹假对话) */
.hero-mockup-tray {
  background: #FFFFFF;
  border-radius: var(--radius-tray);
  border: 3px solid var(--border-tray);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
  background-color: #FAFDF8;
}

.tray-bamboo-header {
  background: linear-gradient(135deg, var(--primary-mulberry-dark) 0%, var(--primary-mulberry-green) 70%, var(--accent-bamboo) 100%);
  padding: 14px 18px;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tray-dots {
  display: flex;
  gap: 6px;
}

.tray-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
}

.tray-header-title {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.tray-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tray-dialog {
  display: flex;
  gap: 12px;
}

.dialog-avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

.dialog-user .dialog-avatar {
  background: #E1EBE0;
  color: var(--text-dark);
}

.dialog-bot .dialog-avatar {
  background: var(--primary-mulberry-green);
  color: #FFFFFF;
}

.dialog-bubble {
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.88rem;
  line-height: 1.5;
  max-width: 86%;
}

.dialog-user .dialog-bubble {
  background: #FFFFFF;
  border: 1px solid var(--border-bamboo);
  color: var(--text-dark);
}

.dialog-bot .dialog-bubble {
  background: #F1F8EE;
  border: 1px solid #D1E5CD;
  color: var(--text-dark);
}

.tray-leaf-tags {
  display: flex;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px dashed var(--border-tray);
}

.tray-tag {
  font-size: 0.72rem;
  padding: 4px 8px;
  border-radius: 6px;
  background: #EAF4E8;
  color: var(--primary-mulberry-dark);
  font-weight: 600;
  border: 1px solid #CDE2CA;
}

.tray-tag.active {
  background: var(--primary-mulberry-green);
  color: #FFFFFF;
  border-color: var(--primary-mulberry-dark);
}

/* ================== Shared Section Headers ================== */
.section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-bamboo);
}

.section-head {
  text-align: center;
  margin-bottom: 36px;
}

.section-subhead {
  font-size: 0.82rem;
  color: var(--primary-mulberry-green);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.section-title {
  font-size: 1.85rem;
  color: var(--text-dark);
  font-weight: 800;
  letter-spacing: -0.3px;
}

.section-intro {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 8px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

/* ================== Feature Section ================== */
.features-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
}

.feature-bar {
  display: grid;
  grid-template-columns: 240px 1fr;
  background: var(--bg-card);
  border: 1px solid var(--border-bamboo);
  border-left: 4px solid var(--primary-mulberry-green);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  gap: 20px;
  align-items: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.feature-bar:hover {
  border-color: var(--accent-bamboo);
  border-left-color: var(--accent-bamboo);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-bar-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-mulberry-dark);
}

.feature-bar-icon {
  width: 32px;
  height: 32px;
  background: rgba(45, 125, 70, 0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--primary-mulberry-green);
}

.feature-bar-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.feature-cards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bamboo);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.feature-card:hover {
  border-color: var(--primary-mulberry-green);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid var(--border-bamboo);
}

.feature-card-body {
  padding: 20px 24px;
}

.feature-card-h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.feature-card-p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================== Step Section ================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bamboo);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.step-card:hover {
  border-color: var(--accent-bamboo);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.step-badge {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-mulberry-green) 0%, var(--accent-bamboo) 100%);
  color: #FFFFFF;
  font-size: 1.1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  box-shadow: 0 2px 6px rgba(45, 125, 70, 0.25);
}

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ================== Checklist Section (深色大卡对照清单) ================== */
.dark-checklist-card {
  background: linear-gradient(145deg, #16241B 0%, #0F1A13 100%);
  border-radius: var(--radius-lg);
  border: 2px solid #283F30;
  padding: 36px 32px;
  color: #E2ECE5;
  box-shadow: var(--shadow-lg);
}

.checklist-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(226, 236, 229, 0.15);
}

.checklist-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #FFFFFF;
}

.checklist-subtitle {
  font-size: 0.85rem;
  color: var(--accent-bamboo-light);
}

.checklist-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.checklist-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.04);
  padding: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(226, 236, 229, 0.08);
}

.checklist-icon-wrong {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(235, 87, 87, 0.2);
  color: #EB5757;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.82rem;
  flex-shrink: 0;
}

.checklist-icon-right {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(120, 165, 90, 0.25);
  color: var(--accent-bamboo-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.82rem;
  flex-shrink: 0;
}

.checklist-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 4px;
}

.checklist-content p {
  font-size: 0.85rem;
  color: #A5BAAC;
  line-height: 1.5;
}

/* ================== Scenarios Section ================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bamboo);
  border-radius: var(--radius-md);
  padding: 24px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.scenario-card:hover {
  border-color: var(--primary-mulberry-green);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.scenario-avatar {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(45, 125, 70, 0.1);
  color: var(--primary-mulberry-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
}

.scenario-role {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dark);
}

.scenario-bubble {
  background: #F2F8EF;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  border-left: 3px solid var(--primary-mulberry-green);
}

.scenario-action {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary-mulberry-dark);
  margin-top: auto;
}

/* ================== Pro Tips Section ================== */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tip-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bamboo);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.tip-card:hover {
  border-color: var(--primary-mulberry-green);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.tip-tag {
  font-size: 0.72rem;
  color: var(--primary-mulberry-green);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.tip-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.tip-text {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================== Troubleshooting Notes ================== */
.trouble-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.trouble-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bamboo);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 24px;
  align-items: center;
  box-shadow: var(--shadow-sm);
}

.trouble-symptom h4 {
  font-size: 0.82rem;
  color: #D93829;
  font-weight: 700;
  margin-bottom: 4px;
}

.trouble-symptom p {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-dark);
}

.trouble-solution h4 {
  font-size: 0.82rem;
  color: var(--primary-mulberry-green);
  font-weight: 700;
  margin-bottom: 4px;
}

.trouble-solution ol {
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ================== FAQ Section ================== */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-bamboo);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.faq-item[open] {
  border-color: var(--primary-mulberry-green);
  box-shadow: var(--shadow-md);
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary-mulberry-green);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 20px 16px;
  border-top: 1px solid rgba(220, 231, 214, 0.5);
  padding-top: 12px;
}

.faq-answer p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================== News Section ================== */
.news-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.news-item {
  background: var(--bg-card);
  border: 1px solid var(--border-bamboo);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.news-item:hover {
  border-color: var(--primary-mulberry-green);
  transform: translateX(3px);
}

.news-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-dark);
}

.news-date {
  font-size: 0.78rem;
  color: var(--text-light);
  white-space: nowrap;
}

.news-freshness {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-light);
}

/* ================== Final CTA ================== */
.cta-section {
  padding: 64px 0;
  text-align: center;
  background: linear-gradient(135deg, rgba(45, 125, 70, 0.08) 0%, rgba(120, 165, 90, 0.08) 100%);
  border-bottom: 1px solid var(--border-bamboo);
}

.cta-box {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.cta-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-dark);
}

.cta-desc {
  font-size: 1rem;
  color: var(--text-muted);
}

/* ================== Footer ================== */
.site-footer {
  background-color: #121C15;
  color: #B2C2B5;
  padding: 56px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

.footer-brand h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: #839787;
  line-height: 1.6;
}

.footer-col h5 {
  font-size: 0.92rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 14px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  font-size: 0.84rem;
  color: #839787;
}

.footer-links a:hover {
  color: var(--accent-bamboo-light);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(178, 194, 181, 0.12);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: #647567;
}

/* ================== Responsive ================== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .feature-cards-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr 1fr;
  }
  .checklist-grid {
    grid-template-columns: 1fr;
  }
  .scenarios-grid {
    grid-template-columns: 1fr 1fr;
  }
  .tips-grid {
    grid-template-columns: 1fr;
  }
  .trouble-card {
    grid-template-columns: 1fr;
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .hero-h1-bottom {
    font-size: 1.75rem;
  }
  .section-title {
    font-size: 1.5rem;
  }
  .feature-bar {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .nav-menu {
    display: none;
  }
}


/* PERF-PATCH-20260928 */
img { max-width: 100%; }
@media (max-width: 900px) {
  header, .header, .site-header {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }
}
@media (max-width: 900px), (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-iteration-count: 1 !important;
    animation-duration: 0.6s !important;
  }
}
main section:not(#hero):not(.hero) {
  content-visibility: auto;
  contain-intrinsic-size: auto 420px;
}