/* ==========================================================================
   FineTune 官方网站 - 公共样式表
   扁平 / 现代 / 专业 · 主色 #0A84FF（Apple System Blue）
   ========================================================================== */

:root {
  /* Brand Palette */
  --color-primary: #0A84FF;
  --color-primary-dark: #0060DF;
  --color-primary-light: #4DA0FF;
  --color-accent: #FF375F;
  --color-success: #30D158;
  --color-warning: #FF9F0A;

  /* Neutral */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F5F7;
  --color-bg-dark: #1C1C1E;
  --color-bg-darker: #0B0B0D;
  --color-surface: #FFFFFF;
  --color-border: #D2D2D7;
  --color-border-soft: #E5E5EA;

  /* Text */
  --color-text: #1D1D1F;
  --color-text-secondary: #6E6E73;
  --color-text-tertiary: #8E8E93;
  --color-text-inverse: #F5F5F7;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "PingFang SC", "Helvetica Neue", "Microsoft YaHei", "微软雅黑",
    Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  /* Spacing & Layout */
  --max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 28px;
  --radius-full: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.06), 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.10), 0 6px 16px rgba(0, 0, 0, 0.05);
  --shadow-blue: 0 12px 32px rgba(10, 132, 255, 0.30);

  /* Transition */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* 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: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg, video { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--color-primary-dark); }
button { font-family: inherit; cursor: pointer; border: 0; background: transparent; }
ul, ol { padding-left: 1.2em; }
h1, h2, h3, h4, h5, h6 { margin: 0 0 .5em; line-height: 1.25; font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 800; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }

/* Layout helpers */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section--alt { background: var(--color-bg-alt); }
.section--dark { background: var(--color-bg-dark); color: var(--color-text-inverse); }
.section--dark a { color: var(--color-primary-light); }
.section--dark h1, .section--dark h2, .section--dark h3 { color: #fff; }
.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(10, 132, 255, 0.10);
  color: var(--color-primary);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-title h2 { margin-bottom: 16px; }
.section-title p { color: var(--color-text-secondary); font-size: 1.08rem; margin: 0; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1;
  border: 1px solid transparent;
  transition: transform .2s var(--ease), background .2s var(--ease), box-shadow .2s var(--ease), color .2s var(--ease);
  text-align: center;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-blue);
}
.btn--primary:hover { background: var(--color-primary-dark); color: #fff; }
.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover { background: var(--color-bg-alt); color: var(--color-text); border-color: var(--color-text-secondary); }
.btn--white {
  background: #fff; color: var(--color-text);
  box-shadow: var(--shadow-md);
}
.btn--white:hover { background: #f0f0f3; color: var(--color-text); }
.btn--lg { padding: 16px 32px; font-size: 1.05rem; }
.btn--block { display: flex; width: 100%; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border-soft);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--color-text); }
.brand img { width: 30px; height: 30px; border-radius: 7px; }
.brand:hover { color: var(--color-primary); }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: .95rem;
}
.nav-links a:hover { color: var(--color-text); background: var(--color-bg-alt); }
.nav-links a.active { color: var(--color-primary); background: rgba(10,132,255,.08); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-cta .btn { padding: 9px 18px; font-size: .9rem; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block;
  width: 20px; height: 2px;
  background: var(--color-text);
  position: relative;
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* Hero */
.hero {
  position: relative;
  padding: 90px 0 70px;
  overflow: hidden;
  background:
    radial-gradient(1100px 480px at 80% -10%, rgba(10,132,255,.16), transparent 60%),
    radial-gradient(900px 400px at 10% 0%, rgba(255,55,95,.08), transparent 60%),
    linear-gradient(180deg, #fff 0%, #F5F5F7 100%);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.hero__title { margin-bottom: 24px; }
.hero__title .accent { color: var(--color-primary); }
.hero__subtitle { font-size: 1.18rem; color: var(--color-text-secondary); max-width: 560px; margin-bottom: 32px; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero__meta {
  margin-top: 28px;
  display: flex; gap: 24px; flex-wrap: wrap;
  color: var(--color-text-tertiary); font-size: .92rem;
}
.hero__meta strong { color: var(--color-text); }
.hero__visual {
  position: relative;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #1C1C1E 0%, #2A2A2D 100%);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.hero__visual::after {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(600px 300px at 80% 100%, rgba(10,132,255,.25), transparent 70%);
  pointer-events: none;
}
.mock-app {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-lg);
  padding: 18px;
  position: relative; z-index: 1;
}
.mock-app__bar { display: flex; align-items: center; gap: 6px; margin-bottom: 16px; }
.mock-dot { width: 10px; height: 10px; border-radius: 50%; }
.mock-dot.r { background: #FF5F57; }
.mock-dot.y { background: #FEBC2E; }
.mock-dot.g { background: #28C840; }
.mock-row {
  display: grid;
  grid-template-columns: 28px 1fr 60px;
  align-items: center; gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.mock-row:last-child { border: 0; }
.mock-icon { width: 28px; height: 28px; border-radius: 6px; background: linear-gradient(135deg, #0A84FF, #5AC8FA); }
.mock-icon.b2 { background: linear-gradient(135deg, #FF375F, #FF9F0A); }
.mock-icon.b3 { background: linear-gradient(135deg, #30D158, #30D158); }
.mock-icon.b4 { background: linear-gradient(135deg, #BF5AF2, #FF375F); }
.mock-slider {
  height: 6px; border-radius: var(--radius-full);
  background: rgba(255,255,255,.12);
  position: relative;
}
.mock-slider i {
  position: absolute; left: 0; top: 0; bottom: 0;
  background: linear-gradient(90deg, #0A84FF, #5AC8FA);
  border-radius: inherit;
}
.mock-slider i::after {
  content: ""; position: absolute; right: -6px; top: -3px;
  width: 12px; height: 12px; border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.3);
}
.mock-val { text-align: right; color: rgba(255,255,255,.7); font-size: .85rem; font-variant-numeric: tabular-nums; }

/* Trust strip */
.trust {
  background: #fff;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border-soft);
}
.trust__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  text-align: center;
}
.trust__num {
  font-size: 2rem; font-weight: 800; color: var(--color-text);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.trust__label { color: var(--color-text-secondary); font-size: .92rem; margin-top: 4px; }

/* Feature cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}
.feature-card__icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(10,132,255,.12), rgba(10,132,255,.04));
  color: var(--color-primary);
  margin-bottom: 18px;
  font-size: 1.5rem;
}
.feature-card__icon svg { width: 26px; height: 26px; }
.feature-card h3 { margin-bottom: 10px; font-size: 1.18rem; }
.feature-card p { color: var(--color-text-secondary); margin: 0; font-size: .96rem; }

/* Scenarios */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.scenario {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 32px;
  overflow: hidden;
  border: 1px solid var(--color-border-soft);
  background: var(--color-surface);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.scenario:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.scenario__tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(10,132,255,.10);
  color: var(--color-primary);
  font-size: .78rem; font-weight: 600;
  margin-bottom: 14px;
  letter-spacing: .04em;
}
.scenario--alt .scenario__tag { background: rgba(255,55,95,.10); color: var(--color-accent); }
.scenario--green .scenario__tag { background: rgba(48,209,88,.12); color: var(--color-success); }
.scenario--purple .scenario__tag { background: rgba(191,90,242,.12); color: #BF5AF2; }
.scenario h3 { font-size: 1.3rem; margin-bottom: 10px; }
.scenario p { color: var(--color-text-secondary); margin-bottom: 16px; }
.scenario ul { margin: 0; padding-left: 1.1em; color: var(--color-text-secondary); font-size: .95rem; }
.scenario ul li { margin-bottom: 6px; }

/* Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review {
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex; flex-direction: column;
}
.review__stars { color: #FF9F0A; font-size: 1.05rem; letter-spacing: 2px; margin-bottom: 14px; }
.review__body { color: var(--color-text); font-size: 1rem; line-height: 1.7; flex: 1; margin-bottom: 20px; }
.review__author { display: flex; align-items: center; gap: 12px; }
.review__avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1rem;
}
.avatar-1 { background: linear-gradient(135deg, #0A84FF, #5AC8FA); }
.avatar-2 { background: linear-gradient(135deg, #FF375F, #FF9F0A); }
.avatar-3 { background: linear-gradient(135deg, #30D158, #30D158); }
.avatar-4 { background: linear-gradient(135deg, #BF5AF2, #FF375F); }
.avatar-5 { background: linear-gradient(135deg, #FF9F0A, #FF375F); }
.avatar-6 { background: linear-gradient(135deg, #5AC8FA, #0A84FF); }
.review__name { font-weight: 600; font-size: .95rem; }
.review__role { color: var(--color-text-tertiary); font-size: .82rem; }

/* Download CTA */
.cta-band {
  background: linear-gradient(135deg, #0A84FF 0%, #0060DF 100%);
  color: #fff;
  border-radius: var(--radius-xl);
  padding: 56px 48px;
  text-align: center;
  box-shadow: var(--shadow-blue);
}
.cta-band h2 { color: #fff; margin-bottom: 14px; }
.cta-band p { color: rgba(255,255,255,.92); font-size: 1.1rem; max-width: 640px; margin: 0 auto 28px; }
.cta-band .btn--white { background: #fff; color: var(--color-primary); }

/* Footer */
.site-footer {
  background: var(--color-bg-darker);
  color: rgba(255,255,255,.6);
  padding: 64px 0 28px;
  font-size: .92rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; color: #fff; font-weight: 700; font-size: 1.1rem; }
.footer-brand img { width: 30px; height: 30px; border-radius: 7px; }
.footer-desc { color: rgba(255,255,255,.55); line-height: 1.7; max-width: 340px; }
.footer-col h4 { color: #fff; font-size: .95rem; margin-bottom: 16px; letter-spacing: .02em; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: rgba(255,255,255,.6); font-size: .9rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  padding-top: 24px;
  color: rgba(255,255,255,.4);
  font-size: .82rem;
}
.footer-bottom a { color: rgba(255,255,255,.5); }

/* Page header (inner pages) */
.page-hero {
  padding: 72px 0 56px;
  background: radial-gradient(900px 400px at 80% -10%, rgba(10,132,255,.10), transparent 60%), var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border-soft);
}
.page-hero h1 { margin-bottom: 18px; }
.page-hero p { color: var(--color-text-secondary); font-size: 1.12rem; max-width: 720px; margin: 0; }
.breadcrumb { font-size: .88rem; color: var(--color-text-tertiary); margin-bottom: 18px; }
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb span { margin: 0 8px; }

/* Generic content blocks */
.prose { max-width: 820px; margin: 0 auto; }
.prose h2 { margin: 56px 0 16px; }
.prose h3 { margin: 32px 0 12px; }
.prose p, .prose li { color: var(--color-text); font-size: 1.05rem; line-height: 1.8; }
.prose ul, .prose ol { color: var(--color-text); }
.prose code {
  font-family: var(--font-mono);
  background: var(--color-bg-alt);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: .9em;
  color: var(--color-primary-dark);
}
.prose pre {
  background: var(--color-bg-dark);
  color: #f5f5f7;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: .92rem;
  line-height: 1.6;
}
.prose pre code { background: transparent; color: inherit; padding: 0; }
.prose blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 4px 0 4px 20px;
  margin: 24px 0;
  color: var(--color-text-secondary);
  font-style: normal;
}

/* Feature list (detailed) */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 88px;
}
.feature-detail:last-child { margin-bottom: 0; }
.feature-detail--reverse .feature-detail__media { order: -1; }
.feature-detail__media {
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #F5F5F7, #E8E8ED);
  padding: 36px;
  aspect-ratio: 4 / 3;
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
}
.feature-detail__media.dark {
  background: linear-gradient(135deg, #1C1C1E, #2A2A2D);
}
.feature-detail__body h2 { margin-bottom: 16px; }
.feature-detail__body .eyebrow { margin-bottom: 12px; }
.feature-detail__body p { color: var(--color-text-secondary); font-size: 1.05rem; }
.feature-detail__list { list-style: none; padding: 0; margin: 20px 0 0; }
.feature-detail__list li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 12px;
  color: var(--color-text);
}
.feature-detail__list li::before {
  content: "";
  position: absolute; left: 0; top: .55em;
  width: 18px; height: 18px;
  background: var(--color-primary);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='black'><path d='M9 16.17 4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z'/></svg>") center/contain no-repeat;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='black'><path d='M9 16.17 4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z'/></svg>") center/contain no-repeat;
  border-radius: 50%;
}

/* Tabs (used on download & guide) */
.tabs {
  display: flex; gap: 4px;
  background: var(--color-bg-alt);
  padding: 6px;
  border-radius: var(--radius-full);
  margin-bottom: 32px;
  width: fit-content;
}
.tab {
  padding: 9px 22px;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: .95rem;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.tab.active { background: #fff; color: var(--color-text); box-shadow: var(--shadow-sm); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn .35s var(--ease); }

/* Download page cards */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}
.dl-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.dl-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.dl-card__icon {
  width: 56px; height: 56px;
  margin: 0 auto 16px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #0A84FF, #5AC8FA);
  color: #fff;
}
.dl-card__icon svg { width: 28px; height: 28px; }
.dl-card h3 { font-size: 1.15rem; margin-bottom: 6px; }
.dl-card__meta { color: var(--color-text-tertiary); font-size: .86rem; margin-bottom: 16px; }
.dl-card__cmd {
  background: var(--color-bg-dark);
  color: #f5f5f7;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: .82rem;
  text-align: left;
  margin: 14px 0;
  position: relative;
}
.dl-card__cmd button {
  position: absolute; top: 8px; right: 8px;
  font-size: .72rem;
  padding: 4px 10px;
  background: rgba(255,255,255,.1);
  color: #fff;
  border-radius: 6px;
}

/* System requirements */
.sysreq {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 56px;
}
.sysreq__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.sysreq__item h4 { font-size: 1rem; margin-bottom: 6px; color: var(--color-text); }
.sysreq__item p { color: var(--color-text-secondary); margin: 0; font-size: .94rem; }

/* Changelog */
.changelog {
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 8px 32px;
}
.changelog__item {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border-soft);
}
.changelog__item:last-child { border: 0; }
.changelog__head { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; flex-wrap: wrap; }
.changelog__ver {
  font-weight: 700; font-size: 1.15rem; color: var(--color-text);
}
.changelog__date {
  color: var(--color-text-tertiary); font-size: .88rem;
}
.changelog__tag {
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: rgba(48,209,88,.14);
  color: var(--color-success);
  font-size: .76rem; font-weight: 600;
}
.changelog__list { margin: 0; padding-left: 1.2em; color: var(--color-text-secondary); font-size: .96rem; }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--color-border-soft);
  padding: 4px 0;
}
.faq-item__q {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.04rem;
  color: var(--color-text);
  list-style: none;
}
.faq-item__q::-webkit-details-marker { display: none; }
.faq-item__q::after {
  content: "+";
  font-size: 1.4rem; font-weight: 400; color: var(--color-primary);
  transition: transform .2s var(--ease);
}
.faq-item[open] .faq-item__q::after { transform: rotate(45deg); }
.faq-item__a {
  padding: 0 0 18px;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

/* Modal */
.modal {
  position: fixed; inset: 0; z-index: 100;
  display: none;
  align-items: center; justify-content: center;
  padding: 24px;
}
.modal.open { display: flex; animation: fadeIn .25s var(--ease); }
.modal__overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(4px);
}
.modal__box {
  position: relative;
  background: #fff;
  border-radius: var(--radius-xl);
  padding: 40px;
  max-width: 720px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: scaleIn .3s var(--ease);
}
.modal__close {
  position: absolute; top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  transition: background .2s var(--ease);
}
.modal__close:hover { background: var(--color-border-soft); color: var(--color-text); }
.modal__head { text-align: center; margin-bottom: 28px; }
.modal__head img { width: 64px; height: 64px; margin: 0 auto 14px; border-radius: 14px; }
.modal__head h3 { font-size: 1.5rem; margin-bottom: 6px; }
.modal__head p { color: var(--color-text-secondary); margin: 0; font-size: .96rem; }
.modal__qr-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 28px 0;
}
.qr-card {
  text-align: center;
  padding: 20px 16px;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
}
.qr-card__img {
  width: 160px; height: 160px;
  margin: 0 auto 12px;
  border-radius: var(--radius-sm);
  background: #fff;
  padding: 10px;
  box-shadow: var(--shadow-sm);
}
.qr-card__img svg, .qr-card__img canvas { width: 100%; height: 100%; }
.qr-card__title { font-weight: 600; font-size: .98rem; margin-bottom: 4px; color: var(--color-text); }
.qr-card__hint { font-size: .82rem; color: var(--color-text-tertiary); }
.modal__primary {
  width: 100%;
  margin-top: 8px;
}
.modal__foot {
  text-align: center;
  margin-top: 18px;
  font-size: .84rem;
  color: var(--color-text-tertiary);
}
.modal__foot a { font-weight: 500; }

/* Animations */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes scaleIn { from { opacity: 0; transform: scale(.95); } to { opacity: 1; transform: scale(1); } }

/* Showcase stripe (alternative look) */
.showcase {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.showcase__cell {
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  padding: 22px;
  text-align: center;
}
.showcase__cell .num {
  font-size: 1.9rem; font-weight: 800; color: var(--color-primary);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.showcase__cell .label {
  color: var(--color-text-secondary); font-size: .9rem; margin-top: 4px;
}

/* About page */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.value-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  padding: 24px;
}
.value-card h4 { font-size: 1.05rem; margin-bottom: 8px; }
.value-card p { color: var(--color-text-secondary); margin: 0; font-size: .94rem; }

/* Responsive */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; gap: 40px; }
  .hero__visual { max-width: 540px; margin: 0 auto; }
  .feature-detail { grid-template-columns: 1fr; gap: 32px; }
  .feature-detail--reverse .feature-detail__media { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .section { padding: 64px 0; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav.open .nav-links {
    display: flex;
    position: absolute;
    top: 60px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    padding: 16px;
    border-bottom: 1px solid var(--color-border-soft);
    box-shadow: var(--shadow-md);
  }
  .nav.open .nav-links a { padding: 12px 14px; }
  .nav-cta .btn--ghost { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
  .sysreq__grid { grid-template-columns: 1fr; }
  .value-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .showcase { grid-template-columns: 1fr 1fr; }
  .cta-band { padding: 40px 24px; }
  .modal__qr-row { grid-template-columns: 1fr; }
  .modal__box { padding: 28px 22px; }
  .trust__grid { grid-template-columns: 1fr 1fr; gap: 18px; }
}

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; }
.hide-mobile { display: initial; }
.show-mobile { display: none; }
@media (max-width: 720px) {
  .hide-mobile { display: none; }
  .show-mobile { display: initial; }
}