/* ==========================================================================
   PPSSPP 官方中文站 - 主样式表
   设计语言：扁平 · 现代 · 专业
   主色：#5587a3（logo 蓝）  辅色：#aedce8（浅青）  深色：#447c8e
   ========================================================================== */

/* ---- CSS 变量 ---- */
:root {
  /* 品牌色 */
  --c-primary: #5587a3;
  --c-primary-dark: #447c8e;
  --c-primary-darker: #2f5666;
  --c-primary-light: #aedce8;
  --c-primary-lighter: #d4eaf2;
  --c-primary-bg: #eef6f9;
  --c-accent: #ff7a59;
  --c-accent-dark: #e85f3e;

  /* 中性色 */
  --c-text: #1a2530;
  --c-text-muted: #5a6c7c;
  --c-text-soft: #7a8a99;
  --c-border: #e1e8ee;
  --c-border-soft: #eef2f6;
  --c-bg: #ffffff;
  --c-bg-alt: #f6f9fb;
  --c-bg-dark: #1a2530;

  /* 状态色 */
  --c-success: #2eb872;
  --c-warning: #f0a830;
  --c-danger:  #e74c3c;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* 尺寸 */
  --container: 1180px;
  --container-narrow: 880px;
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 14px;
  --shadow-soft: 0 2px 8px rgba(26, 37, 48, 0.06);
  --shadow-card: 0 4px 18px rgba(26, 37, 48, 0.08);
  --shadow-hover: 0 10px 32px rgba(85, 135, 163, 0.18);
  --transition: 0.2s ease;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--c-primary-dark); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-accent); }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4, h5, h6 { margin: 0 0 0.6em; font-weight: 700; line-height: 1.3; color: var(--c-text); }
h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -0.005em; }
h3 { font-size: 1.25rem; }
p  { margin: 0 0 1em; }
:focus-visible { outline: 3px solid var(--c-primary-light); outline-offset: 2px; border-radius: var(--radius-sm); }

/* ---- Layout ---- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: var(--container-narrow); }
.section { padding: 80px 0; }
.section--alt { background: var(--c-bg-alt); }
.section--primary { background: var(--c-primary); color: #fff; }
.section--dark { background: var(--c-bg-dark); color: #e6edf2; }
.section__head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section__head .eyebrow {
  display: inline-block; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--c-primary); margin-bottom: 14px;
  padding: 4px 14px; background: var(--c-primary-bg); border-radius: 100px;
}
.section__head h2 { margin-bottom: 16px; }
.section__head p { color: var(--c-text-muted); font-size: 1.05rem; margin-bottom: 0; }
.section--primary .section__head .eyebrow { background: rgba(255,255,255,0.16); color: #fff; }
.section--primary .section__head p { color: rgba(255,255,255,0.85); }

/* ---- Header / Nav ---- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border-soft);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; color: var(--c-text); }
.brand img { width: 36px; height: 36px; }
.brand span { color: var(--c-primary-dark); }
.brand small { display: block; font-size: 0.7rem; font-weight: 500; color: var(--c-text-soft); letter-spacing: 0.06em; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px; border-radius: var(--radius-sm); font-weight: 500;
  color: var(--c-text); font-size: 0.95rem;
}
.main-nav a:hover { background: var(--c-primary-bg); color: var(--c-primary-dark); }
.main-nav a.is-active { color: var(--c-primary-dark); font-weight: 700; }
.main-nav a.is-active::after {
  content: ""; display: block; height: 2px; width: 22px; margin: 4px auto 0;
  background: var(--c-primary); border-radius: 2px;
}

.header-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle {
  display: none; width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: var(--c-primary-bg); align-items: center; justify-content: center;
}
.nav-toggle svg { width: 22px; height: 22px; stroke: var(--c-primary-dark); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius);
  font-weight: 600; font-size: 0.95rem; letter-spacing: 0.01em;
  transition: all var(--transition); cursor: pointer;
  border: 1.5px solid transparent; white-space: nowrap;
}
.btn--primary {
  background: var(--c-primary); color: #fff;
  box-shadow: 0 4px 14px rgba(85, 135, 163, 0.28);
}
.btn--primary:hover { background: var(--c-primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(85, 135, 163, 0.4); }
.btn--accent {
  background: var(--c-accent); color: #fff;
  box-shadow: 0 4px 14px rgba(255, 122, 89, 0.28);
}
.btn--accent:hover { background: var(--c-accent-dark); color: #fff; transform: translateY(-1px); }
.btn--ghost {
  background: transparent; color: var(--c-primary-dark);
  border-color: var(--c-primary-light);
}
.btn--ghost:hover { background: var(--c-primary-bg); border-color: var(--c-primary); color: var(--c-primary-dark); }
.btn--light {
  background: #fff; color: var(--c-primary-dark);
}
.btn--light:hover { background: var(--c-primary-lighter); color: var(--c-primary-dark); transform: translateY(-1px); }
.btn--lg { padding: 14px 32px; font-size: 1rem; }
.btn--sm { padding: 8px 16px; font-size: 0.85rem; }
.btn--block { width: 100%; }
.btn svg { width: 18px; height: 18px; }

/* ---- Hero ---- */
.hero {
  position: relative; padding: 80px 0 90px;
  background:
    radial-gradient(ellipse 80% 60% at 80% 0%, var(--c-primary-bg) 0%, transparent 60%),
    linear-gradient(180deg, #fff 0%, var(--c-primary-bg) 100%);
  overflow: hidden;
}
.hero__grid {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 60px; align-items: center;
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 14px 6px 6px; border-radius: 100px;
  background: rgba(85, 135, 163, 0.08); color: var(--c-primary-dark);
  font-size: 0.85rem; font-weight: 600; margin-bottom: 24px;
}
.hero__eyebrow .tag { background: var(--c-primary); color: #fff; padding: 2px 10px; border-radius: 100px; font-size: 0.75rem; }
.hero h1 { margin-bottom: 20px; }
.hero h1 .hl { color: var(--c-primary); }
.hero__lead { font-size: 1.15rem; color: var(--c-text-muted); max-width: 560px; margin-bottom: 32px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 36px; }
.hero__stats { display: flex; gap: 40px; padding-top: 32px; border-top: 1px solid var(--c-border); }
.hero__stat strong { display: block; font-size: 1.8rem; font-weight: 800; color: var(--c-primary-dark); line-height: 1.1; }
.hero__stat span { font-size: 0.88rem; color: var(--c-text-soft); }

.hero__visual { position: relative; }
.hero__card {
  background: #fff; border-radius: var(--radius-lg); padding: 28px;
  box-shadow: var(--shadow-card); border: 1px solid var(--c-border-soft);
}
.hero__card-row { display: flex; align-items: center; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--c-border-soft); }
.hero__card-row:last-child { border-bottom: none; }
.hero__card-row .icon-box {
  width: 44px; height: 44px; border-radius: var(--radius);
  background: var(--c-primary-bg); display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.hero__card-row .icon-box svg { width: 22px; height: 22px; stroke: var(--c-primary-dark); }
.hero__card-row strong { display: block; font-size: 0.95rem; color: var(--c-text); }
.hero__card-row span { font-size: 0.82rem; color: var(--c-text-soft); }

.hero__badge {
  position: absolute; top: -18px; right: -10px;
  background: var(--c-accent); color: #fff; padding: 10px 16px;
  border-radius: var(--radius); font-weight: 700; font-size: 0.85rem;
  box-shadow: 0 6px 18px rgba(255, 122, 89, 0.35);
  transform: rotate(4deg);
}

/* ---- 平台徽章 ---- */
.platform-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.platform-badges .badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 100px;
  background: #fff; border: 1px solid var(--c-border);
  font-size: 0.8rem; font-weight: 600; color: var(--c-text-muted);
}
.platform-badges .badge svg { width: 14px; height: 14px; }

/* ---- Stats Strip ---- */
.stats-strip {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  background: #fff; padding: 36px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft); border: 1px solid var(--c-border-soft);
}
.stats-strip__item { text-align: center; }
.stats-strip__item strong { display: block; font-size: 2rem; font-weight: 800; color: var(--c-primary-dark); }
.stats-strip__item span { font-size: 0.9rem; color: var(--c-text-soft); }
.stats-strip__item:not(:last-child) { border-right: 1px solid var(--c-border-soft); }

/* ---- Scenarios Grid (使用场景) ---- */
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.scenario-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--c-border-soft); transition: all var(--transition);
}
.scenario-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--c-primary-light); }
.scenario-card__cover {
  height: 160px; padding: 24px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-dark) 100%);
  color: #fff;
}
.scenario-card:nth-child(2) .scenario-card__cover { background: linear-gradient(135deg, var(--c-primary-dark) 0%, #2f5666 100%); }
.scenario-card:nth-child(3) .scenario-card__cover { background: linear-gradient(135deg, #3a7a96 0%, var(--c-primary) 100%); }
.scenario-card:nth-child(4) .scenario-card__cover { background: linear-gradient(135deg, var(--c-primary-dark) 0%, #3a6e80 100%); }
.scenario-card:nth-child(5) .scenario-card__cover { background: linear-gradient(135deg, #2f5666 0%, var(--c-primary-dark) 100%); }
.scenario-card:nth-child(6) .scenario-card__cover { background: linear-gradient(135deg, var(--c-primary) 0%, #3a7a96 100%); }
.scenario-card__cover svg { width: 36px; height: 36px; stroke: #fff; opacity: 0.9; }
.scenario-card__cover .label { position: absolute; bottom: 18px; left: 24px; font-weight: 700; font-size: 1rem; }
.scenario-card__body { padding: 22px; }
.scenario-card__body h3 { margin-bottom: 8px; }
.scenario-card__body p { font-size: 0.92rem; color: var(--c-text-muted); margin-bottom: 0; }

/* ---- Feature Grid ---- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: #fff; border-radius: var(--radius-lg); padding: 28px;
  border: 1px solid var(--c-border-soft); transition: all var(--transition);
}
.feature-card:hover { box-shadow: var(--shadow-hover); border-color: var(--c-primary-light); transform: translateY(-2px); }
.feature-card__icon {
  width: 56px; height: 56px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--c-primary-bg) 0%, var(--c-primary-lighter) 100%);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.feature-card__icon svg { width: 28px; height: 28px; stroke: var(--c-primary-dark); }
.feature-card h3 { margin-bottom: 8px; }
.feature-card p { font-size: 0.92rem; color: var(--c-text-muted); margin-bottom: 0; }
.feature-card ul { margin-top: 12px; }
.feature-card ul li { font-size: 0.88rem; color: var(--c-text-muted); padding-left: 18px; position: relative; margin-bottom: 4px; }
.feature-card ul li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; background: var(--c-primary); border-radius: 50%; }

/* ---- CTA Block ---- */
.cta-block {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-dark) 100%);
  color: #fff; border-radius: var(--radius-lg); padding: 56px 48px;
  text-align: center; position: relative; overflow: hidden;
}
.cta-block::before, .cta-block::after {
  content: ""; position: absolute; border-radius: 50%; opacity: 0.12; background: #fff;
}
.cta-block::before { width: 320px; height: 320px; top: -120px; right: -100px; }
.cta-block::after { width: 220px; height: 220px; bottom: -100px; left: -80px; }
.cta-block h2 { color: #fff; margin-bottom: 14px; position: relative; }
.cta-block p { color: rgba(255,255,255,0.9); font-size: 1.05rem; max-width: 640px; margin: 0 auto 28px; position: relative; }
.cta-block .hero__actions { justify-content: center; margin-bottom: 0; position: relative; }

/* ---- Download Section (homepage) ---- */
.download-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.download-tile {
  background: #fff; border: 1px solid var(--c-border-soft); border-radius: var(--radius);
  padding: 24px 16px; text-align: center; transition: all var(--transition);
}
.download-tile:hover { border-color: var(--c-primary-light); box-shadow: var(--shadow-soft); transform: translateY(-2px); }
.download-tile .icon-box {
  width: 56px; height: 56px; margin: 0 auto 12px; border-radius: var(--radius);
  background: var(--c-primary-bg); display: flex; align-items: center; justify-content: center;
}
.download-tile .icon-box svg { width: 28px; height: 28px; stroke: var(--c-primary-dark); }
.download-tile h3 { font-size: 1rem; margin-bottom: 4px; }
.download-tile .ver { font-size: 0.78rem; color: var(--c-text-soft); margin-bottom: 12px; }
.download-tile .btn { padding: 8px 14px; font-size: 0.85rem; }

/* ---- Footer ---- */
.site-footer { background: var(--c-bg-dark); color: #b6c3cd; padding: 60px 0 30px; }
.site-footer a { color: #b6c3cd; }
.site-footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-brand .brand { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; color: #95a5af; margin-bottom: 18px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.08); display: inline-flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.footer-social a:hover { background: var(--c-primary); color: #fff; }
.footer-social svg { width: 18px; height: 18px; }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 14px; font-weight: 600; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 0.9rem; }
.footer-bottom { padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: #7a8a94; }
.footer-bottom a { color: #7a8a94; }

/* ---- Breadcrumb ---- */
.breadcrumb { padding: 18px 0 0; font-size: 0.88rem; color: var(--c-text-soft); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.breadcrumb li::after { content: "/"; margin-left: 8px; color: var(--c-border); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--c-text-muted); }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb li:last-child { color: var(--c-text); }

/* ---- Page header (sub-pages) ---- */
.page-header {
  padding: 56px 0 40px; background:
    radial-gradient(ellipse 70% 80% at 0% 0%, var(--c-primary-bg) 0%, transparent 60%),
    linear-gradient(180deg, #fff 0%, var(--c-primary-bg) 100%);
}
.page-header h1 { margin-bottom: 12px; }
.page-header p { font-size: 1.1rem; color: var(--c-text-muted); max-width: 680px; margin-bottom: 0; }

/* ---- Tables ---- */
.table-wrap { overflow-x: auto; border: 1px solid var(--c-border-soft); border-radius: var(--radius-lg); }
table.table { width: 100%; border-collapse: collapse; background: #fff; min-width: 580px; }
table.table th, table.table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--c-border-soft); font-size: 0.92rem; }
table.table th { background: var(--c-bg-alt); font-weight: 700; color: var(--c-text); white-space: nowrap; }
table.table tr:last-child td { border-bottom: none; }
table.table tr:hover td { background: var(--c-primary-bg); }
.table-platform { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; }
.table-platform svg { width: 18px; height: 18px; stroke: var(--c-primary-dark); }

/* ---- Download cards (download page) ---- */
.platform-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.platform-card {
  background: #fff; border: 1px solid var(--c-border-soft); border-radius: var(--radius-lg);
  padding: 28px; transition: all var(--transition);
}
.platform-card:hover { box-shadow: var(--shadow-card); border-color: var(--c-primary-light); }
.platform-card__head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; padding-bottom: 18px; border-bottom: 1px solid var(--c-border-soft); }
.platform-card__icon { width: 56px; height: 56px; border-radius: var(--radius); background: var(--c-primary-bg); display: flex; align-items: center; justify-content: center; }
.platform-card__icon svg { width: 32px; height: 32px; stroke: var(--c-primary-dark); }
.platform-card__head h3 { margin: 0; }
.platform-card__head .ver { font-size: 0.82rem; color: var(--c-text-soft); }
.platform-card__specs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; margin-bottom: 20px; }
.platform-card__specs .spec { font-size: 0.86rem; }
.platform-card__specs .spec dt { color: var(--c-text-soft); margin-bottom: 2px; }
.platform-card__specs .spec dd { margin: 0; font-weight: 600; color: var(--c-text); }
.platform-card__actions { display: flex; gap: 10px; flex-wrap: wrap; }
.platform-card__notes { margin-top: 14px; padding: 12px 14px; background: var(--c-primary-bg); border-left: 3px solid var(--c-primary-light); border-radius: var(--radius-sm); font-size: 0.85rem; color: var(--c-text-muted); }

/* ---- Version timeline ---- */
.timeline { position: relative; padding-left: 32px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: var(--c-border); }
.timeline__item { position: relative; padding-bottom: 28px; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: ""; position: absolute; left: -28px; top: 6px;
  width: 14px; height: 14px; border-radius: 50%;
  background: #fff; border: 3px solid var(--c-primary);
}
.timeline__item .date { font-size: 0.82rem; color: var(--c-primary); font-weight: 700; margin-bottom: 4px; }
.timeline__item h3 { margin-bottom: 6px; font-size: 1.05rem; }
.timeline__item p { font-size: 0.9rem; color: var(--c-text-muted); margin-bottom: 0; }
.timeline__item ul { margin-top: 8px; }
.timeline__item ul li { font-size: 0.86rem; color: var(--c-text-muted); padding-left: 16px; position: relative; margin-bottom: 3px; }
.timeline__item ul li::before { content: "—"; position: absolute; left: 0; color: var(--c-primary); }

/* ---- FAQ accordion ---- */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: #fff; border: 1px solid var(--c-border-soft); border-radius: var(--radius);
  overflow: hidden; transition: all var(--transition);
}
.faq-item[open] { box-shadow: var(--shadow-soft); border-color: var(--c-primary-light); }
.faq-item summary {
  padding: 18px 22px; font-weight: 600; font-size: 0.98rem; cursor: pointer;
  list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; font-size: 1.6rem; font-weight: 300; color: var(--c-primary); transition: transform var(--transition);
}
.faq-item[open] summary::after { content: "−"; }
.faq-item__body { padding: 0 22px 18px; color: var(--c-text-muted); font-size: 0.92rem; }
.faq-item__body p { margin-bottom: 8px; }
.faq-item__body p:last-child { margin-bottom: 0; }

/* ---- Tutorial steps ---- */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step-card { background: #fff; border: 1px solid var(--c-border-soft); border-radius: var(--radius-lg); padding: 28px 24px; position: relative; counter-increment: step; }
.step-card::before {
  content: counter(step, decimal-leading-zero);
  display: inline-block; font-size: 2.2rem; font-weight: 800; color: var(--c-primary-light);
  line-height: 1; margin-bottom: 14px;
}
.step-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.step-card p { font-size: 0.9rem; color: var(--c-text-muted); margin-bottom: 0; }

/* ---- Tutorial content ---- */
.tutorial-block {
  background: #fff; border: 1px solid var(--c-border-soft); border-radius: var(--radius-lg);
  padding: 32px; margin-bottom: 24px;
}
.tutorial-block h2 { margin-bottom: 18px; padding-bottom: 14px; border-bottom: 2px solid var(--c-primary-bg); }
.tutorial-block h3 { margin-top: 24px; margin-bottom: 10px; color: var(--c-primary-dark); }
.tutorial-block p, .tutorial-block li { color: var(--c-text-muted); font-size: 0.95rem; }
.tutorial-block ul { padding-left: 20px; margin-bottom: 14px; }
.tutorial-block ul li { list-style: disc; margin-bottom: 6px; }
.tutorial-block code {
  font-family: var(--font-mono); font-size: 0.88em;
  background: var(--c-primary-bg); color: var(--c-primary-darker);
  padding: 2px 8px; border-radius: var(--radius-sm);
}
.tutorial-block .callout {
  background: var(--c-primary-bg); border-left: 4px solid var(--c-primary);
  padding: 14px 18px; border-radius: var(--radius-sm); margin: 18px 0;
  font-size: 0.9rem; color: var(--c-text-muted);
}
.tutorial-block .callout strong { color: var(--c-primary-dark); }

/* ---- About team ---- */
.team-card {
  background: #fff; border: 1px solid var(--c-border-soft); border-radius: var(--radius-lg);
  padding: 28px; text-align: center;
}
.team-card__avatar {
  width: 96px; height: 96px; border-radius: 50%; margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-dark) 100%);
  display: flex; align-items: center; justify-content: center; color: #fff;
  font-size: 2rem; font-weight: 700;
}
.team-card h3 { margin-bottom: 4px; }
.team-card .role { color: var(--c-primary); font-size: 0.88rem; font-weight: 600; margin-bottom: 10px; }
.team-card p { font-size: 0.88rem; color: var(--c-text-muted); margin-bottom: 0; }

/* ---- License / Project info ---- */
.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.info-card {
  background: #fff; border: 1px solid var(--c-border-soft); border-radius: var(--radius-lg);
  padding: 24px;
}
.info-card .label { font-size: 0.78rem; color: var(--c-text-soft); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 6px; }
.info-card .value { font-size: 1.05rem; font-weight: 700; color: var(--c-text); }
.info-card .desc { font-size: 0.86rem; color: var(--c-text-muted); margin-top: 6px; }

/* ---- Modal (download popup) ---- */
.modal {
  position: fixed; inset: 0; z-index: 200; display: none;
  background: rgba(26, 37, 48, 0.55); backdrop-filter: blur(4px);
  align-items: center; justify-content: center; padding: 24px;
}
.modal.is-open { display: flex; animation: modal-fade 0.2s ease-out; }
.modal__dialog {
  background: #fff; border-radius: var(--radius-lg); width: 100%; max-width: 540px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25); overflow: hidden;
  animation: modal-slide 0.25s ease-out;
}
.modal__head {
  padding: 22px 28px; border-bottom: 1px solid var(--c-border-soft);
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: linear-gradient(135deg, var(--c-primary-bg) 0%, #fff 100%);
}
.modal__head h3 { margin: 0; font-size: 1.15rem; }
.modal__head .sub { font-size: 0.82rem; color: var(--c-text-soft); margin-top: 2px; }
.modal__close {
  width: 32px; height: 32px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.5); color: var(--c-text-muted);
  font-size: 1.4rem; line-height: 1; transition: all var(--transition);
}
.modal__close:hover { background: var(--c-danger); color: #fff; }
.modal__body { padding: 28px; }
.modal__qrs { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 20px; }
.modal__qr { text-align: center; padding: 18px 12px; border: 1px solid var(--c-border-soft); border-radius: var(--radius); }
.modal__qr img { width: 168px; height: 168px; margin: 0 auto 12px; display: block; border-radius: var(--radius-sm); }
.modal__qr .name { font-weight: 700; font-size: 0.95rem; color: var(--c-text); margin-bottom: 4px; }
.modal__qr .hint { font-size: 0.78rem; color: var(--c-text-soft); }
.modal__qr .badge {
  display: inline-block; font-size: 0.72rem; font-weight: 700; padding: 2px 10px;
  border-radius: 100px; margin-bottom: 8px;
}
.modal__qr--quark .badge { background: #4a90e2; color: #fff; }
.modal__qr--baidu .badge { background: #2b5cff; color: #fff; }
.modal__notice {
  background: var(--c-primary-bg); border-radius: var(--radius); padding: 12px 16px;
  font-size: 0.84rem; color: var(--c-text-muted); text-align: center;
}
.modal__notice strong { color: var(--c-primary-dark); }
@keyframes modal-fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes modal-slide { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* ---- Misc ---- */
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.mb-0 { margin-bottom: 0; }
.lead { font-size: 1.1rem; color: var(--c-text-muted); }
.kbd {
  font-family: var(--font-mono); font-size: 0.85em;
  background: var(--c-bg-alt); border: 1px solid var(--c-border);
  border-bottom-width: 2px; border-radius: var(--radius-sm);
  padding: 1px 7px; color: var(--c-text);
}
.tag-pill {
  display: inline-block; font-size: 0.72rem; font-weight: 700;
  padding: 3px 10px; border-radius: 100px; background: var(--c-primary-bg);
  color: var(--c-primary-dark);
}
.tag-pill--green { background: rgba(46, 184, 114, 0.12); color: var(--c-success); }
.tag-pill--orange { background: rgba(255, 122, 89, 0.14); color: var(--c-accent-dark); }

/* ---- Responsive ---- */
@media (max-width: 960px) {
  .hero__grid { grid-template-columns: 1fr; gap: 40px; }
  .hero__stats { gap: 24px; }
  .scenario-grid, .feature-grid, .download-list, .info-grid, .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .download-list { grid-template-columns: repeat(2, 1fr); }
  .platform-grid { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); gap: 18px; padding: 24px; }
  .stats-strip__item:nth-child(2) { border-right: none; }
  .stats-strip__item:nth-child(odd) { border-right: 1px solid var(--c-border-soft); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .main-nav {
    position: fixed; top: 68px; left: 0; right: 0; bottom: 0;
    background: #fff; flex-direction: column; padding: 20px; gap: 4px;
    transform: translateX(100%); transition: transform 0.25s ease;
    overflow-y: auto; border-top: 1px solid var(--c-border);
  }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav a { width: 100%; padding: 14px 16px; font-size: 1.05rem; }
  .nav-toggle { display: flex; }
  .header-cta .btn--ghost { display: none; }
}

@media (max-width: 600px) {
  .section { padding: 56px 0; }
  .section__head { margin-bottom: 36px; }
  .hero { padding: 48px 0 60px; }
  .hero h1 { font-size: 2rem; }
  .hero__lead { font-size: 1rem; }
  .hero__stats { gap: 18px; padding-top: 24px; }
  .hero__stat strong { font-size: 1.4rem; }
  .hero__stats .hero__stat { flex: 1 1 45%; }
  .scenario-grid, .feature-grid, .download-list, .info-grid, .steps-grid { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: 1fr 1fr; }
  .stats-strip__item { border-right: none !important; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .cta-block { padding: 40px 24px; }
  .modal__qrs { grid-template-columns: 1fr; }
  .modal__dialog { max-width: 100%; }
  .platform-card__specs { grid-template-columns: 1fr; }
  .brand small { display: none; }
  .breadcrumb { font-size: 0.8rem; }
}

/* ---- Print ---- */
@media print {
  .site-header, .site-footer, .modal, .btn { display: none !important; }
  body { font-size: 12pt; }
}