/* @module website-styles @purpose 官方品牌页排版与响应式，复用已批准设计及 YogaPalette。 @updated 2026-10-19 */
:root {
  --background: #fff;
  --surface: #f5f8f1;
  --ink: #14211a;
  --ink-secondary: #3f4f44;
  --ink-muted: #566559;
  --line: #e3e9de;
  --accent: #b6e63e;
  --on-accent: #16240a;
  --accent-pressed: #9ccb28;
  --hover: #eef5dc;
  --night: #0a0f0b;
  --on-night: #f1f4ec;
  --on-night-secondary: #bac5b7;
  --night-line: #263122;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --font-xs: .8125rem;
  --font-small: .875rem;
  --font-body-size: 1rem;
  --font-lead: 1.125rem;
  --font-title: clamp(2rem, 3.4vw, 3rem);
  --font-hero: clamp(2.625rem, 5.1vw, 4.5rem);
  --gutter: clamp(1.25rem, 5.6vw, 5.5rem);
  --page-width: 75rem;
  --space-xs: .5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-section: clamp(4.5rem, 8vw, 7.5rem);
  --radius-image: 1.5rem;
  --radius-action: .5rem;
  --motion: 180ms;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-block-start: var(--space-lg); }
body { margin: 0; background: var(--background); color: var(--ink); font-family: var(--font-body); font-size: var(--font-body-size); -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .3em; }
button, summary, a { -webkit-tap-highlight-color: transparent; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--ink); outline-offset: 5px; }
p, h1, h2, h3, figure, dl, dd { margin: 0; }
h1, h2 { font-family: var(--font-display); font-weight: 600; letter-spacing: -.035em; }
h2 { font-size: var(--font-title); line-height: 1.4; }
p { line-height: 1.9; }
.wrap { width: calc(100% - var(--gutter) * 2); max-width: var(--page-width); margin-inline: auto; }
.section-space { padding-block: var(--space-section); }
.section-label, .eyebrow { font-size: var(--font-small); color: var(--ink-muted); letter-spacing: .1em; font-weight: 500; }
.section-label { margin-block-end: var(--space-md); }
.skip-link { position: fixed; z-index: 10; inset-block-start: var(--space-sm); inset-inline-start: var(--space-sm); padding: var(--space-sm); color: var(--on-accent); background: var(--accent); transform: translateY(-200%); }
.skip-link:focus { transform: none; }
.site-header { min-height: 6.5rem; display: flex; align-items: center; gap: var(--space-xl); }
.brand { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; min-height: 2.75rem; flex-shrink: 0; }
.brand img { width: 2rem; height: 2rem; border-radius: .5rem; }
.wordmark { font-size: 1.375rem; font-weight: 650; letter-spacing: .045em; }
.desktop-nav { display: flex; gap: var(--space-lg); margin-inline-start: auto; }
.desktop-nav a, .site-footer a { display: inline-flex; align-items: center; min-height: 2.75rem; font-size: var(--font-small); text-decoration: none; }
.desktop-nav a:hover, .site-footer a:hover { text-decoration: underline; }
.mobile-menu { display: none; }
.hero { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: clamp(3rem, 6vw, 6rem); padding-block: var(--space-lg) 4rem; }
.hero-copy { padding-block-end: var(--space-xl); }
.eyebrow { margin-block-end: var(--space-lg); }
h1 { font-size: var(--font-hero); line-height: 1.23; }
h1 span { display: block; }
.hero-description { margin-block-start: var(--space-lg); font-size: var(--font-lead); color: var(--ink-secondary); line-height: 1.9; }
.primary-action { display: inline-flex; align-items: center; justify-content: center; min-height: 3.5rem; padding: .875rem 2rem; margin-block-start: var(--space-lg); background: var(--accent); color: var(--on-accent); border-radius: var(--radius-action); font-weight: 600; text-decoration: none; transition: background-color var(--motion); }
.primary-action:hover { background: var(--accent-pressed); }
.primary-action:active { background: var(--accent-pressed); }
.hero-footnote { margin-block-start: var(--space-md); font-size: var(--font-small); color: var(--ink-muted); }
.hero-visual { min-width: 0; }
.hero-visual img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; object-position: center 35%; border-radius: var(--radius-image); }
.hero-visual figcaption { margin-block-start: var(--space-sm); color: var(--ink-muted); font-size: var(--font-xs); text-align: end; letter-spacing: .05em; }
.introduction { border-block-start: 1px solid var(--line); padding-block: 3.5rem; display: grid; grid-template-columns: 1fr 4fr; gap: var(--space-xl); }
.introduction > .section-label { padding-block-start: .5rem; }
.introduction-body { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl); align-items: center; }
.introduction h2 { font-size: clamp(1.75rem, 2.7vw, 2.25rem); }
.introduction-body > p { color: var(--ink-secondary); }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-xl); margin-block-end: var(--space-xl); }
.section-description { color: var(--ink-secondary); max-width: 26rem; padding-block-end: .5rem; }
.capture-surface { padding: clamp(.75rem, 2.4vw, 2rem); background: var(--surface); border-radius: var(--radius-image); }
.capture-original { display: block; }
.capture-surface img { width: 100%; border-radius: .75rem; }
.app-capture figcaption { display: flex; justify-content: space-between; gap: var(--space-sm); margin-block-start: var(--space-sm); color: var(--ink-muted); font-size: var(--font-xs); line-height: 1.8; }
.experience-points { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-xl); margin-block-start: 2.5rem; }
.experience-points dt { font-size: var(--font-lead); font-weight: 600; line-height: 1.7; }
.experience-points dd { color: var(--ink-secondary); line-height: 1.9; margin-block-start: var(--space-xs); }
.practice { border-block-start: 1px solid var(--line); }
.practice-steps { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-lg); }
.practice-steps li { border-block-start: 1px solid var(--line); padding-block-start: var(--space-md); }
.step-number { display: block; font-family: var(--font-display); font-size: 2.5rem; line-height: 1.4; color: var(--ink-muted); margin-block-end: 1.75rem; }
.practice-steps h3 { font-size: var(--font-lead); font-weight: 600; line-height: 1.7; margin-block-end: var(--space-xs); }
.practice-steps p { color: var(--ink-secondary); }
.device-section { color: var(--on-night); background: var(--night); }
.device-content { padding-block: var(--space-section); }
.device-content .section-label { color: var(--on-night-secondary); }
.device-columns { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl); margin-block-start: var(--space-xl); border-block-start: 1px solid var(--night-line); padding-block-start: var(--space-xl); }
.device-columns h3 { font-size: 1.5rem; font-weight: 500; line-height: 1.7; margin-block-end: var(--space-sm); }
.device-columns p { color: var(--on-night-secondary); font-size: var(--font-lead); }
.device-note { margin-block-start: var(--space-xl); color: var(--on-night-secondary); font-size: var(--font-small); }
.questions { display: grid; grid-template-columns: 2fr 3fr; gap: var(--space-xl); }
.questions-heading > p:last-child { color: var(--ink-secondary); margin-block-start: var(--space-md); }
.question-list { border-block-start: 1px solid var(--line); }
.question-list details { border-block-end: 1px solid var(--line); }
.question-list summary { cursor: pointer; padding-block: var(--space-md); padding-inline-end: var(--space-xs); min-height: 2.75rem; font-size: var(--font-lead); font-weight: 500; line-height: 1.7; }
.question-list summary::marker { font-size: .75em; color: var(--ink-muted); }
.question-list summary:hover { color: var(--ink-secondary); }
.question-list details[open] summary { font-weight: 600; }
.question-list details > p { padding-block-end: var(--space-md); color: var(--ink-secondary); }
.practice-note { display: grid; grid-template-columns: 2fr 3fr; gap: var(--space-xl); border-block-start: 1px solid var(--line); padding-block: var(--space-lg); }
.practice-note .section-label { margin: .25rem 0 0; }
.practice-note > p:last-child { color: var(--ink-secondary); font-size: var(--font-small); }
.site-footer { padding-block: 2.5rem var(--space-lg); border-block-start: 1px solid var(--line); }
.footer-main { display: flex; justify-content: space-between; align-items: center; gap: var(--space-md); }
.footer-wordmark { font-weight: 650; font-size: 1.375rem; letter-spacing: .045em; }
.footer-meta { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-xs) var(--space-xl); margin-block-start: var(--space-md); color: var(--ink-muted); font-size: var(--font-xs); }
@media (max-width: 70rem) {
  .site-header { gap: var(--space-lg); }
  .hero { gap: var(--space-xl); }
  .hero-copy { padding-block-end: var(--space-md); }
  .hero-description { font-size: var(--font-body-size); }
  .introduction { grid-template-columns: 1fr 5fr; gap: var(--space-lg); }
  .introduction-body { gap: var(--space-lg); }
  .section-heading { align-items: start; }
  .section-description { max-width: 21rem; padding-block-start: 2.7rem; }
  .experience-points { gap: var(--space-lg); }
  .practice-steps { gap: var(--space-md); }
}
@media (max-width: 48rem) {
  .site-header { min-height: 5rem; gap: var(--space-sm); flex-wrap: wrap; padding-block: .75rem; }
  .brand { gap: .625rem; }
  .wordmark { font-size: 1.125rem; }
  .brand img { width: 1.875rem; height: 1.875rem; }
  .desktop-nav { display: none; }
  .mobile-menu { display: block; position: relative; margin-inline-start: auto; }
  .mobile-menu > summary { cursor: pointer; min-height: 2.75rem; min-inline-size: 2.75rem; padding-block: .75rem; font-size: var(--font-small); line-height: 1.4; }
  .mobile-menu nav { position: absolute; z-index: 2; inset-inline-end: 0; inset-block-start: calc(100% + .5rem); display: flex; flex-direction: column; width: 12rem; max-width: calc(100vw - 2.5rem); padding: .5rem var(--space-sm); border: 1px solid var(--line); border-radius: var(--radius-action); background: var(--background); }
  .mobile-menu nav a { display: flex; align-items: center; padding-block: .75rem; min-height: 2.75rem; text-decoration: none; }
  .mobile-menu nav a:hover { text-decoration: underline; }
  .hero { grid-template-columns: 1fr; gap: 2.5rem; padding-block: 2rem 3rem; }
  .hero-copy { padding: 0; }
  .eyebrow { margin-block-end: var(--space-md); font-size: var(--font-xs); }
  h1 { font-size: clamp(2.625rem, 8vw, 3.5rem); line-height: 1.25; }
  .hero-description { margin-block-start: var(--space-md); font-size: var(--font-body-size); }
  .primary-action { margin-block-start: var(--space-md); min-height: 3.25rem; }
  .hero-footnote { margin-block-start: var(--space-sm); }
  .hero-visual img { aspect-ratio: 6 / 5; object-position: center 25%; border-radius: 1rem; }
  .hero-visual figcaption { font-size: .75rem; }
  .introduction { display: block; padding-block: var(--space-xl); }
  .introduction > .section-label { padding: 0; margin-block-end: var(--space-md); }
  .introduction-body { grid-template-columns: 1fr; gap: var(--space-md); }
  .introduction h2 { font-size: 1.875rem; }
  .section-heading { flex-direction: column; gap: var(--space-md); margin-block-end: 2rem; }
  .section-description { padding: 0; max-width: 100%; }
  .desktop-break { display: none; }
  .capture-surface { border-radius: .75rem; padding: .5rem; }
  .capture-surface img { border-radius: .375rem; }
  .app-capture figcaption { flex-direction: column; gap: .25rem; }
  .experience-points { grid-template-columns: 1fr; gap: var(--space-md); margin-block-start: var(--space-lg); }
  .experience-points > div { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); gap: var(--space-sm); }
  .experience-points dt { font-size: var(--font-body-size); }
  .experience-points dd { margin: 0; font-size: var(--font-small); }
  .practice-steps { grid-template-columns: 1fr 1fr; gap: var(--space-lg) var(--space-md); }
  .step-number { margin-block-end: var(--space-sm); font-size: 2rem; }
  .practice-steps h3 { font-size: var(--font-body-size); }
  .practice-steps p { font-size: var(--font-small); }
  .device-columns { grid-template-columns: 1fr; gap: var(--space-lg); padding-block-start: var(--space-lg); margin-block-start: var(--space-lg); }
  .device-columns h3 { font-size: 1.375rem; }
  .device-columns p { font-size: var(--font-body-size); }
  .device-note { margin-block-start: var(--space-lg); }
  .questions { grid-template-columns: 1fr; gap: var(--space-lg); }
  .questions-heading > p:last-child { margin-block-start: var(--space-sm); }
  .question-list summary { font-size: var(--font-body-size); }
  .practice-note { grid-template-columns: 1fr; gap: var(--space-sm); }
  .footer-meta { flex-direction: column; gap: var(--space-xs); }
}
@media (max-width: 24rem) {
  .site-header { column-gap: .75rem; }
  .practice-steps { grid-template-columns: 1fr; }
  .practice-steps li { display: grid; grid-template-columns: 2.5rem 1fr; column-gap: var(--space-sm); }
  .step-number { grid-row: 1 / 3; margin: 0; }
  .experience-points > div { grid-template-columns: 1fr; gap: .25rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}