/* ============================================================
   PrusaSlicer 中文网 - 全站样式
   配色基于 Prusa 品牌橙 (#FF6600) / 深炭灰 (#1D1D1B)
   风格：扁平 / 现代 / 专业
   ============================================================ */

:root {
  --orange: #FF6600;
  --orange-dark: #E55A00;
  --orange-tint: #FFF3EA;
  --dark: #1D1D1B;
  --dark-2: #2A2A28;
  --text: #212529;
  --muted: #6B7280;
  --line: #E5E7EB;
  --bg: #FFFFFF;
  --bg-alt: #F6F7F9;
  --radius: 10px;
  --radius-lg: 16px;
  --container: 1180px;
  --shadow: 0 2px 8px rgba(29, 29, 27, 0.06);
}

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

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

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

a {
  color: var(--orange);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style-position: inside;
}

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

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

.section {
  padding: 72px 0;
}

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

.section-head {
  max-width: 720px;
  margin: 0 auto 48px;
  text-align: center;
}

.kicker {
  display: inline-block;
  color: var(--orange);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: 32px;
  margin-bottom: 14px;
}

.section-head p {
  color: var(--muted);
  font-size: 16px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  padding: 14px 32px;
  border-radius: var(--radius);
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
  text-align: center;
}

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

.btn-primary {
  background: var(--orange);
  color: #fff;
}

.btn-primary:hover {
  background: var(--orange-dark);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-ghost:hover {
  border-color: #fff;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.btn-outline {
  background: #fff;
  color: var(--dark);
  border: 1px solid var(--line);
}

.btn-outline:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.btn-lg {
  font-size: 18px;
  padding: 17px 44px;
}

.btn-block {
  display: block;
  width: 100%;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--line);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--dark);
}
.brand img{max-width: 60px;}
.brand-mark {
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
}

.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.2px;
}

.brand-name small {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 3px;
}

.main-nav ul {
  display: flex;
  gap: 6px;
  list-style: none;
}

.main-nav a {
  display: block;
  padding: 8px 16px;
  color: var(--text);
  font-size: 15px;
  border-radius: 6px;
}

.main-nav a:hover {
  color: var(--orange);
  background: var(--orange-tint);
}

.main-nav a.active {
  color: var(--orange);
  font-weight: 600;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-cta .btn {
  padding: 11px 24px;
  font-size: 15px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--dark);
  margin: 5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ---------- Hero ---------- */
.hero {
  background: var(--dark);
  color: #fff;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 88px 0 72px;
}

.hero .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 102, 0, 0.5);
  color: #FF9D5C;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}

.hero .badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
}

.hero h1 {
  color: #fff;
  font-size: 44px;
  letter-spacing: 0.5px;
  margin-bottom: 18px;
}

.hero h1 em {
  font-style: normal;
  color: var(--orange);
}

.hero-sub {
  color: #B9BCBE;
  font-size: 17px;
  max-width: 540px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.hero-meta {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  color: #8E9193;
  font-size: 13px;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-meta svg {
  color: var(--orange);
}

/* Hero 右侧软件窗口模拟 */
.hero-visual {
  position: relative;
}

.app-window {
  background: #26262A;
  border: 1px solid #3A3A3E;
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.app-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: #1F1F23;
  border-bottom: 1px solid #3A3A3E;
}

.app-titlebar i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #4A4A4E;
}

.app-titlebar i:nth-child(1) { background: #FF5F57; }
.app-titlebar i:nth-child(2) { background: #FEBC2E; }
.app-titlebar i:nth-child(3) { background: #28C840; }

.app-titlebar b {
  margin-left: 10px;
  font-size: 12px;
  font-weight: 500;
  color: #8E9193;
}

.app-body {
  display: grid;
  grid-template-columns: 190px 1fr;
  min-height: 320px;
}

.app-side {
  border-right: 1px solid #3A3A3E;
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.app-side .row {
  height: 10px;
  border-radius: 5px;
  background: #3A3A3E;
}

.app-side .row.short { width: 60%; }
.app-side .row.on { background: var(--orange); }

.app-canvas {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px) 0 0 / 100% 26px,
    #26262A;
}

.app-canvas svg {
  width: 100%;
  max-width: 300px;
  height: auto;
}

.app-status {
  display: flex;
  justify-content: space-between;
  padding: 10px 16px;
  font-size: 12px;
  color: #8E9193;
  border-top: 1px solid #3A3A3E;
  background: #1F1F23;
}

.app-status b {
  color: var(--orange);
  font-weight: 600;
}

/* ---------- 数据统计带 ---------- */
.stats-band {
  background: var(--orange);
  color: #fff;
  padding: 44px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stats-grid b {
  display: block;
  font-size: 36px;
  font-weight: 800;
  line-height: 1.2;
}

.stats-grid span {
  font-size: 14px;
  opacity: 0.92;
}

/* ---------- 功能卡片 ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px 28px;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  border-color: rgba(255, 102, 0, 0.45);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.card .icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--orange-tint);
  color: var(--orange);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.card p {
  color: var(--muted);
  font-size: 15px;
}

.card ul {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  list-style: none;
}

.card ul li {
  padding-left: 18px;
  position: relative;
  margin-bottom: 6px;
}

.card ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--orange);
}

/* ---------- 使用场景 ---------- */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scene {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  overflow: hidden;
}

.scene::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--orange);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.scene:hover::after {
  opacity: 1;
}

.scene .tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--orange);
  background: var(--orange-tint);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.scene h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.scene p {
  color: var(--muted);
  font-size: 14.5px;
}

/* ---------- 用户评价 ---------- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px 28px;
  display: flex;
  flex-direction: column;
}

.review .quote {
  color: var(--orange);
  margin-bottom: 14px;
}

.review p {
  color: var(--text);
  font-size: 15px;
  flex: 1;
}

.review footer {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--orange);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 42px;
}

.review .who b {
  display: block;
  font-size: 15px;
  color: var(--dark);
}

.review .who span {
  font-size: 13px;
  color: var(--muted);
}

.review-note {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  margin-top: 22px;
}

/* ---------- 版本信息 ---------- */
.version-box {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 34px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.version-box h3 {
  font-size: 20px;
  margin-bottom: 6px;
}

.version-box .v-label {
  color: var(--orange);
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 14px;
}

.version-box ul {
  list-style: none;
  color: var(--muted);
  font-size: 14.5px;
}

.version-box ul li {
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}

.version-box ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 2px solid var(--orange);
}

/* ---------- 页面横幅（子页） ---------- */
.page-hero {
  background: var(--dark);
  color: #fff;
  padding: 60px 0;
}

.page-hero .kicker {
  color: #FF9D5C;
}

.page-hero h1 {
  color: #fff;
  font-size: 34px;
  margin-bottom: 12px;
}

.page-hero p {
  color: #B9BCBE;
  max-width: 680px;
}

.breadcrumb {
  font-size: 13px;
  color: #8E9193;
  margin-bottom: 18px;
}

.breadcrumb a {
  color: #8E9193;
}

.breadcrumb a:hover {
  color: #fff;
}

.breadcrumb .sep {
  margin: 0 8px;
}

/* ---------- 下载页 ---------- */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.dl-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.dl-card.featured {
  border-color: var(--orange);
  border-width: 2px;
  position: relative;
}

.dl-card .os-icon {
  color: var(--dark);
  margin-bottom: 16px;
}

.dl-card.featured .os-icon {
  color: var(--orange);
}

.dl-card h3 {
  font-size: 20px;
  margin-bottom: 4px;
}

.dl-card .dl-size {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 18px;
}

.dl-spec {
  width: 100%;
  text-align: left;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid var(--line);
}

.dl-spec li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.dl-spec li b {
  color: var(--dark);
  font-weight: 600;
}

.dl-card .btn {
  width: 100%;
}

.dl-qr-inline {
  display: flex;
  gap: 28px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 24px;
}

.dl-qr-inline figure {
  text-align: center;
}

.dl-qr-inline img {
  width: 140px;
  height: 140px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px;
  background: #fff;
  margin-bottom: 10px;
}

.dl-qr-inline b {
  display: block;
  font-size: 14px;
  color: var(--dark);
}

.dl-qr-inline span {
  font-size: 12px;
  color: var(--muted);
}

/* 更新日志表 */
.changelog {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.changelog th,
.changelog td {
  text-align: left;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}

.changelog th {
  background: var(--bg-alt);
  color: var(--dark);
  font-weight: 700;
}

.changelog td.ver {
  font-weight: 700;
  color: var(--orange);
  white-space: nowrap;
}

.changelog td.date {
  color: var(--muted);
  white-space: nowrap;
}

.changelog tr:last-child td {
  border-bottom: none;
}

/* ---------- 教程页：步骤 ---------- */
.steps {
  display: grid;
  gap: 24px;
}

.step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  align-items: start;
}

.step .num {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--orange);
  color: #fff;
  font-size: 26px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.step p {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 10px;
}

.step .kbd-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.step .kbd-row code {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 13px;
  color: var(--dark);
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  font-weight: 600;
  font-size: 16px;
  color: var(--dark);
}

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

.faq-item summary .chev {
  flex: 0 0 auto;
  color: var(--orange);
  transition: transform 0.2s ease;
}

.faq-item[open] summary .chev {
  transform: rotate(180deg);
}

.faq-item .faq-body {
  padding: 0 22px 20px;
  color: var(--muted);
  font-size: 15px;
}

.faq-item .faq-body a {
  font-weight: 600;
}

/* ---------- 关于页：时间线 ---------- */
.timeline {
  position: relative;
  max-width: 780px;
  margin: 0 auto;
  padding-left: 28px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--line);
}

.timeline li {
  position: relative;
  padding: 0 0 30px 24px;
  list-style: none;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--orange);
}

.timeline b {
  display: block;
  color: var(--orange);
  font-size: 14px;
  margin-bottom: 4px;
}

.timeline h3 {
  font-size: 17px;
  margin-bottom: 4px;
}

.timeline p {
  color: var(--muted);
  font-size: 14.5px;
}

.prose {
  max-width: 860px;
  margin: 0 auto;
}

.prose h2 {
  font-size: 26px;
  margin: 44px 0 16px;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  color: #4B5563;
  margin-bottom: 16px;
}

.prose ul {
  color: #4B5563;
  margin-bottom: 16px;
}

.prose li {
  margin-bottom: 6px;
}

/* ---------- CTA 横幅 ---------- */
.cta-band {
  background: var(--dark);
  color: #fff;
  padding: 64px 0;
  text-align: center;
}

.cta-band h2 {
  color: #fff;
  font-size: 30px;
  margin-bottom: 12px;
}

.cta-band p {
  color: #B9BCBE;
  margin-bottom: 30px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: #141412;
  color: #9A9DA0;
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 56px 0 40px;
}

.footer-grid h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
}

.footer-grid ul {
  list-style: none;
}

.footer-grid li {
  margin-bottom: 10px;
}

.footer-grid a {
  color: #9A9DA0;
}

.footer-grid a:hover {
  color: var(--orange);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.footer-brand img{max-width:40px;}
.footer-brand .brand-name {
  color: #fff;
}

.footer-brand .brand-name small {
  color: #6E7174;
}

.footer-desc {
  line-height: 1.8;
  max-width: 300px;
}

.footer-bottom {
  border-top: 1px solid #2A2A28;
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- 下载弹窗 ---------- */
.dl-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.dl-modal.open {
  display: flex;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}
button { outline: none } 
.dl-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 20, 18, 0.66);
}

.dl-modal-panel {
  position: relative;
  background: #fff;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 560px;
  padding: 40px 36px 32px;
  text-align: center;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.3);
  animation: modalIn 0.22s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.dl-modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 50%;
  background: var(--bg-alt);
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.dl-modal-close:hover {
  background: var(--orange-tint);
  color: var(--orange);
}

.dl-modal-panel h3 {
  font-size: 22px;
  margin-bottom: 6px;
}

.dl-modal-panel .dl-modal-sub {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 26px;
}

.dl-qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 26px;
}

.dl-qr-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 14px;
}

.dl-qr-item img {
  width: 148px;
  height: 148px;
  margin: 0 auto 12px;
}

.dl-qr-item b {
  display: block;
  font-size: 15px;
  color: var(--dark);
  margin-bottom: 2px;
}

.dl-qr-item span {
  font-size: 12.5px;
  color: var(--muted);
}

.dl-modal-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 30px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #fff;
  color: var(--dark);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  z-index: 90;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.back-top.show {
  display: flex;
}

.back-top:hover {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    padding: 56px 0 48px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-visual {
    max-width: 520px;
    margin: 0 auto;
  }

  .grid-3,
  .scene-grid,
  .review-grid,
  .dl-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 16px;
  }

  .version-box {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  .main-nav.open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 10px 16px 16px;
  }

  .main-nav a {
    padding: 13px 8px;
    border-radius: 0;
    border-bottom: 1px solid var(--bg-alt);
  }

  .header-cta .btn {
    display: none;
  }

  .section {
    padding: 52px 0;
  }

  .section-head h2 {
    font-size: 26px;
  }

  .grid-3,
  .scene-grid,
  .review-grid,
  .grid-2,
  .dl-grid {
    grid-template-columns: 1fr;
  }

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

  .dl-qr-grid {
    grid-template-columns: 1fr;
  }

  .page-hero h1 {
    font-size: 27px;
  }

  .changelog th,
  .changelog td {
    padding: 12px 12px;
    font-size: 13px;
  }
}