:root {
  --ink: #252526;
  --muted: #676568;
  --paper: #f5f3f1;
  --surface: #ffffff;
  --line: #ddd8d3;
  --accent: #cb6b56;
  --accent-soft: #f3ded8;
  --dark: #242426;
  --radius: 7px;
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.72; letter-spacing: 0; -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { display: block; max-width: 100%; }
button { font: inherit; }
.skip-link { position: fixed; top: -80px; left: 18px; z-index: 40; padding: 10px 14px; color: var(--ink); background: white; }
.skip-link:focus { top: 12px; }
.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(245,243,241,.97); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 72px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 36px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; color: white; background: var(--accent); border-radius: 50%; font-size: 12px; }
.main-nav { justify-self: center; display: flex; gap: 28px; }
.main-nav a { text-decoration: none; color: #514f52; font-size: 14px; }
.main-nav a:hover, .main-nav a:focus-visible { color: var(--accent); }
.header-actions { display: flex; gap: 9px; }
.menu-toggle { display: none; width: 42px; height: 42px; color: var(--ink); background: transparent; border: 1px solid var(--line); border-radius: 4px; }
.btn { min-height: 42px; display: inline-flex; align-items: center; justify-content: center; padding: 9px 17px; border: 1px solid transparent; border-radius: 5px; text-decoration: none; font-weight: 750; font-size: 14px; transition: transform .24s cubic-bezier(.16,1,.3,1), background .24s, border-color .24s; }
.btn:active { transform: translateY(1px); }
.btn-primary { color: white; background: var(--accent); }
.btn-primary:hover { background: #b95d49; }
.btn-outline { border-color: #8f8985; background: rgba(255,255,255,.7); }
.btn-dark { color: white; background: var(--dark); }
.hero { min-height: 650px; display: grid; align-items: center; background-color: #e7e4e0; background-image: linear-gradient(270deg, rgba(245,243,241,.98) 0%, rgba(245,243,241,.9) 38%, rgba(245,243,241,.08) 72%), url('../images/hero-practice.webp'); background-position: center; background-size: cover; }
.hero-grid { display: grid; grid-template-columns: 1fr .82fr; min-height: 650px; align-items: center; }
.hero-copy { grid-column: 2; padding: 100px 0 110px; }
.kicker { margin: 0 0 18px; color: var(--accent); font-size: 13px; font-weight: 850; text-transform: uppercase; }
.hero h1 { margin: 0; font-size: clamp(42px, 5.5vw, 70px); line-height: 1.08; letter-spacing: 0; max-width: 12ch; }
.hero p { margin: 24px 0 0; max-width: 52ch; color: #5e5b5d; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 32px; }
.practice-bar { color: white; background: var(--dark); }
.practice-bar .container { min-height: 76px; display: grid; grid-template-columns: auto 1fr auto; gap: 28px; align-items: center; }
.practice-label { color: #ef9b88; font-weight: 800; }
.practice-bar p { margin: 0; color: #c9c7c9; font-size: 14px; }
.section { padding: 90px 0; }
.section-white { background: var(--surface); }
.section-dark { color: white; background: var(--dark); }
.section-title { display: flex; align-items: baseline; justify-content: space-between; gap: 30px; margin-bottom: 44px; }
.section-title h2 { margin: 0; max-width: 16ch; font-size: clamp(31px, 4vw, 49px); line-height: 1.16; }
.section-title p { margin: 0; max-width: 56ch; color: var(--muted); }
.section-dark .section-title p { color: #aaa8ab; }
.training-roadmap { display: grid; grid-template-columns: .7fr 1.3fr; gap: 70px; align-items: start; }
.roadmap-intro { padding-top: 18px; border-top: 3px solid var(--accent); }
.roadmap-intro h3 { font-size: 25px; margin: 0 0 10px; }
.roadmap-intro p { color: var(--muted); }
.roadmap-list { counter-reset: steps; border-top: 1px solid var(--line); }
.roadmap-item { counter-increment: steps; display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 25px 0; border-bottom: 1px solid var(--line); }
.roadmap-item::before { content: "0" counter(steps); color: var(--accent); font-weight: 850; font-variant-numeric: tabular-nums; }
.roadmap-item h3 { margin: 0 0 5px; font-size: 20px; }
.roadmap-item p { margin: 0; color: var(--muted); }
.lesson-board { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid #454547; border-radius: var(--radius); overflow: hidden; }
.lesson-link { min-height: 220px; padding: 28px; border-right: 1px solid #454547; border-bottom: 1px solid #454547; text-decoration: none; }
.lesson-link:nth-child(even) { border-right: 0; }
.lesson-link:nth-last-child(-n+2) { border-bottom: 0; }
.lesson-link small { color: #ef9b88; font-weight: 800; }
.lesson-link h3 { margin: 18px 0 8px; font-size: 23px; }
.lesson-link p { margin: 0; color: #aaa8ab; }
.lesson-link:hover { background: #2d2d30; }
.review-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: 24px; }
.review-main { padding: 32px; color: white; background: var(--accent); border-radius: var(--radius); }
.review-main h3 { margin: 0; font-size: 30px; }
.review-main p { color: #fff1ed; }
.review-aside { padding: 30px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.review-aside h3 { margin-top: 0; }
.article-list { border-top: 1px solid var(--line); }
.article-row { display: grid; grid-template-columns: auto minmax(0,1fr) 32px; gap: 24px; align-items: start; padding: 25px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.article-row time { color: var(--accent); font-size: 13px; font-weight: 800; }
.article-row h3 { margin: 0; font-size: 21px; }
.article-row p { margin: 5px 0 0; color: var(--muted); }
.page-hero { padding: 86px 0 68px; background: var(--accent-soft); border-bottom: 1px solid #e5c3bb; }
.breadcrumbs { display: flex; gap: 8px; margin-bottom: 22px; color: #756f70; font-size: 13px; }
.breadcrumbs a { color: #9d4634; }
.page-hero h1 { margin: 0; max-width: 18ch; font-size: clamp(38px, 5vw, 60px); line-height: 1.13; }
.page-hero p { max-width: 65ch; margin: 20px 0 0; color: #5d5758; font-size: 18px; }
.content-layout { display: grid; grid-template-columns: 270px minmax(0,1fr); gap: 68px; align-items: start; }
.content-layout > .prose { grid-column: 2; }
.content-layout > .side-nav { grid-column: 1; grid-row: 1; }
.side-nav { position: sticky; top: 100px; padding: 22px; background: var(--dark); color: white; border-radius: var(--radius); }
.side-nav h2 { margin: 0 0 12px; font-size: 15px; }
.side-nav a { display: block; padding: 10px 0; color: #c8c6c9; border-bottom: 1px solid #454547; text-decoration: none; font-size: 14px; }
.prose { font-size: 17px; }
.prose h2 { margin: 50px 0 14px; font-size: 29px; line-height: 1.28; }
.prose h2:first-child { margin-top: 0; }
.prose p { color: #454146; }
.prose li { margin: 9px 0; }
.callout { margin: 34px 0; padding: 22px 24px; background: var(--accent-soft); border-left: 3px solid var(--accent); }
.guide-index { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }
.guide-card { padding: 25px; background: white; border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; }
.guide-card small { color: var(--accent); font-weight: 800; }
.guide-card h2, .guide-card h3 { margin: 10px 0 8px; font-size: 21px; }
.guide-card p { margin: 0; color: var(--muted); }
.utility-status { padding: 28px; background: white; border: 1px solid var(--line); border-radius: var(--radius); }
.utility-status strong { display: block; margin-bottom: 8px; }
.utility-status p { color: var(--muted); }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { padding: 20px 0; border-bottom: 1px solid var(--line); }
.faq-list summary { cursor: pointer; font-weight: 800; }
.faq-list p { color: var(--muted); }
.site-footer { padding: 62px 0 94px; color: #cac8cb; background: var(--dark); }
.footer-grid { display: grid; grid-template-columns: 1.25fr repeat(3,.7fr); gap: 40px; }
.footer-grid h2, .footer-grid h3 { margin-top: 0; color: white; font-size: 15px; }
.footer-grid p { color: #9e9ca0; max-width: 43ch; }
.footer-grid a { display: block; margin: 9px 0; color: #cac8cb; text-decoration: none; font-size: 14px; }
.footer-bottom { margin-top: 46px; padding-top: 22px; border-top: 1px solid #454547; color: #8d8b8f; font-size: 13px; }
.mobile-cta { display: none; }

@media (max-width: 860px) {
  .header-inner { grid-template-columns: 1fr auto; }
  .menu-toggle { display: grid; place-items: center; }
  .main-nav { position: absolute; top: 72px; left: 0; right: 0; display: none; padding: 18px 20px 24px; background: var(--paper); border-bottom: 1px solid var(--line); }
  .main-nav.is-open { display: grid; gap: 16px; }
  .header-actions { display: none; }
  .hero { background-position: 35% center; }
  .hero-grid { grid-template-columns: .6fr 1fr; }
  .section-title, .training-roadmap, .content-layout { display: grid; grid-template-columns: 1fr; gap: 30px; }
  .content-layout > .prose, .content-layout > .side-nav { grid-column: auto; grid-row: auto; }
  .side-nav { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  body { padding-bottom: 70px; }
  .container { width: min(calc(100% - 28px), var(--max)); }
  .hero { min-height: 570px; background-image: linear-gradient(270deg, rgba(245,243,241,.98), rgba(245,243,241,.75)), url('../images/hero-practice.webp'); background-position: 35% center; }
  .hero-grid { display: block; min-height: 0; }
  .hero-copy { width: min(100%, 480px); margin-left: auto; padding: 88px 0 100px; }
  .hero h1 { font-size: 39px; }
  .hero p { font-size: 16px; }
  .practice-bar .container { min-height: 94px; grid-template-columns: 1fr; gap: 0; align-content: center; }
  .practice-bar .btn { display: none; }
  .section { padding: 64px 0; }
  .section-title { margin-bottom: 32px; }
  .lesson-board, .review-grid, .guide-index { grid-template-columns: 1fr; }
  .lesson-link, .lesson-link:nth-child(even), .lesson-link:nth-last-child(-n+2) { border-right: 0; border-bottom: 1px solid #454547; }
  .lesson-link:last-child { border-bottom: 0; }
  .article-row { grid-template-columns: 1fr 26px; gap: 6px 12px; }
  .article-row time { grid-column: 1 / -1; }
  .article-row p { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .mobile-cta { position: fixed; z-index: 25; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 9px 14px; background: rgba(36,36,38,.98); border-top: 1px solid #454547; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}

/* Rich guide and article layouts */
.intent-section { background: var(--paper); }
.intent-heading { max-width: 760px; margin-bottom: 34px; }
.intent-kicker { margin: 0 0 8px; color: var(--accent); font-size: 13px; font-weight: 850; }
.intent-heading h2 { margin: 0; font-size: 34px; line-height: 1.25; }
.intent-heading > p:last-child { margin: 12px 0 0; color: var(--muted); }
.intent-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.intent-grid article { display: flex; min-height: 250px; flex-direction: column; padding: 26px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.intent-grid article > span { color: var(--accent); font-size: 12px; font-weight: 850; }
.intent-grid h3 { margin: 22px 0 8px; font-size: 22px; }
.intent-grid p { margin: 0 0 24px; color: var(--muted); }
.intent-grid a { margin-top: auto; color: var(--accent); font-weight: 800; text-decoration: none; }
.article-list { display: grid; gap: 16px; border-top: 0; }
.article-row { position: relative; display: grid; grid-template-columns: minmax(190px, 230px) minmax(0, 1fr) 46px; gap: 24px; align-items: center; padding: 0; overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.article-row__image { height: 100%; min-height: 150px; overflow: hidden; }
.article-row__image img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s cubic-bezier(.16,1,.3,1); }
.article-row:hover .article-row__image img { transform: scale(1.025); }
.article-row__content { padding: 20px 0; }
.article-meta { display: flex; flex-wrap: wrap; gap: 7px 16px; margin-bottom: 8px; color: var(--muted); font-size: 12px; font-weight: 700; }
.article-row h3 { margin: 0; font-size: 20px; line-height: 1.35; }
.article-row h3 a { text-decoration: none; }
.article-row h3 a::after { content: ""; position: absolute; inset: 0; }
.article-row p { margin: 7px 0 0; color: var(--muted); }
.article-row__arrow { display: grid; place-items: center; width: 32px; height: 32px; color: var(--accent); font-size: 21px; }
.guide-index { display: grid; grid-template-columns: 1fr; gap: 20px; }
.guide-card { display: grid; grid-template-columns: minmax(240px, .7fr) minmax(0, 1.3fr); padding: 0; overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.guide-card__image { min-height: 220px; overflow: hidden; }
.guide-card__image img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s cubic-bezier(.16,1,.3,1); }
.guide-card:hover .guide-card__image img { transform: scale(1.025); }
.guide-card__content { align-self: center; padding: 30px 34px; }
.guide-card h2 { margin: 0; font-size: 25px; line-height: 1.3; }
.guide-card h2 a { text-decoration: none; }
.guide-card p { margin: 12px 0 0; color: var(--muted); }
.guide-card__more { display: inline-block; margin-top: 18px; color: var(--accent); font-size: 14px; font-weight: 800; }
.article-column { min-width: 0; }
.article-meta--page { margin: 0 0 24px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.article-figure { margin: 32px 0 42px; overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.article-figure img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.article-figure figcaption { padding: 12px 16px; color: var(--muted); font-size: 13px; }
.context-links { margin: 34px 0; padding: 22px 24px; background: var(--surface); border-left: 3px solid var(--accent); }
.context-links strong { display: block; margin-bottom: 7px; }
.context-links a { font-weight: 750; }
.article-pagination { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 54px; padding-top: 26px; border-top: 1px solid var(--line); }
.article-pagination a { min-height: 84px; padding: 16px 18px; text-decoration: none; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.article-pagination span { display: block; margin-bottom: 5px; color: var(--muted); font-size: 12px; }
.article-pagination strong { line-height: 1.4; }
.related-section { margin-top: 64px; }
.related-section > h2 { margin-bottom: 22px; font-size: 26px; }
.related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.related-grid article { overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.related-grid a { display: grid; grid-template-columns: 130px minmax(0, 1fr); min-height: 112px; text-decoration: none; }
.related-grid img { width: 100%; height: 100%; object-fit: cover; grid-row: 1 / span 2; }
.related-grid span { align-self: end; padding: 15px 18px 0; color: var(--muted); font-size: 12px; font-weight: 700; }
.related-grid h3 { align-self: start; margin: 4px 0 0; padding: 0 18px 15px; font-size: 16px; line-height: 1.4; }

@media (max-width: 860px) {
  .intent-grid { grid-template-columns: 1fr; }
  .intent-grid article { min-height: 0; }
  .article-row { grid-template-columns: 190px minmax(0, 1fr) 38px; gap: 18px; }
  .guide-card { grid-template-columns: minmax(200px, .7fr) minmax(0, 1.3fr); }
  .guide-card__content { padding: 25px 28px; }
  .related-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .intent-heading h2 { font-size: 28px; }
  .intent-grid article { padding: 22px 20px; }
  .article-row { grid-template-columns: 112px minmax(0, 1fr); gap: 0 16px; }
  .article-row__image { min-height: 138px; }
  .article-row__content { padding: 15px 12px 15px 0; }
  .article-row h3 { font-size: 16px; }
  .article-row p { display: none; }
  .article-row__arrow { display: none; }
  .article-meta { gap: 4px 10px; font-size: 11px; }
  .article-meta time { grid-column: auto; }
  .guide-card { grid-template-columns: 1fr; }
  .guide-card__image { min-height: auto; aspect-ratio: 16 / 9; }
  .guide-card__content { padding: 22px 20px 25px; }
  .guide-card h2 { font-size: 21px; }
  .article-figure { margin: 25px 0 34px; }
  .context-links { padding: 18px; }
  .article-pagination { grid-template-columns: 1fr; }
  .related-grid a { grid-template-columns: 112px minmax(0, 1fr); }
}