/* roulang page: index */
:root {
      color-scheme: light;
      --ink: #202b2a;
      --muted: #5e6d69;
      --paper: #f5f7f6;
      --white: #fff;
      --line: #dce5e1;
      --green: #176b54;
      --green-dark: #10523f;
      --mint: #e4f1eb;
      --coral: #a9483b;
      --coral-soft: #fbefec;
      --radius: 12px;
      --shadow: 0 14px 34px rgba(26, 55, 45, .08);
      --content: 1160px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font: 16px/1.7 "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    button { font: inherit; }
    .container { width: min(var(--content), calc(100% - 48px)); margin-inline: auto; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(12px);
    }
    .nav {
      min-height: 72px; display: flex; align-items: center;
      justify-content: space-between; gap: 24px;
    }
    .brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 750; }
    .brand-mark {
      display: grid; place-items: center; width: 36px; height: 36px;
      border-radius: 10px; color: white; background: var(--green);
      font-size: 18px;
    }
    .nav-links { display: flex; align-items: center; gap: 28px; }
    .nav-links a {
      color: var(--muted); font-size: 14px; font-weight: 650;
      transition: color .2s ease;
    }
    .nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--green); }
    .nav-links a:focus-visible, .button:focus-visible, .brand:focus-visible {
      outline: 3px solid #77b99f; outline-offset: 4px;
    }
    .hero { padding: 58px 0 48px; }
    .hero-layout {
      min-height: 440px; display: grid; grid-template-columns: 5fr 7fr;
      align-items: center; gap: 34px;
    }
    .hero-copy { position: relative; z-index: 1; padding: 20px 0 20px 12px; }
    .eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      color: var(--green); font-size: 13px; font-weight: 750;
      letter-spacing: .04em;
    }
    .eyebrow::before { content: ""; width: 20px; height: 2px; background: currentColor; }
    h1 { max-width: 560px; margin: 17px 0 16px; font-size: clamp(34px, 4.2vw, 54px); line-height: 1.2; }
    .hero-copy p { max-width: 570px; margin: 0; color: var(--muted); }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
    .button {
      min-height: 46px; display: inline-flex; align-items: center; justify-content: center;
      gap: 9px; padding: 0 18px; border: 1px solid transparent; border-radius: 8px;
      font-weight: 700; transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    }
    .button:hover { transform: translateY(-2px); }
    .button-primary { color: white; background: var(--green); box-shadow: 0 7px 16px rgba(23,107,84,.18); }
    .button-primary:hover { background: var(--green-dark); }
    .button-secondary { color: var(--green-dark); border-color: #b8d1c5; background: white; }
    .hero-art {
      min-height: 396px; position: relative; overflow: hidden;
      display: flex; align-items: flex-end; padding: 30px;
      background: #dfece5;
      clip-path: polygon(8% 0, 100% 0, 100% 100%, 0 100%);
    }
    .hero-art img {
      position: absolute; inset: 0; width: 100%; height: 100%;
      object-fit: cover; object-position: center 45%;
    }
    .hero-art::after {
      content: ""; position: absolute; inset: 30% 0 0;
      background: linear-gradient(180deg, transparent, rgba(15,38,31,.72));
    }
    .art-note { position: relative; z-index: 1; max-width: 390px; color: white; }
    .art-note strong { display: block; font-size: 21px; margin-bottom: 5px; }
    .art-note span { color: rgba(255,255,255,.88); font-size: 14px; }
    .principles { padding: 0 0 38px; }
    .principle-row {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
      background: var(--line); border: 1px solid var(--line); border-radius: var(--radius);
      overflow: hidden;
    }
    .principle { padding: 19px 22px; background: white; }
    .principle b { display: block; margin-bottom: 3px; font-size: 16px; }
    .principle span { color: var(--muted); font-size: 14px; }
    main section { padding: 64px 0; border-top: 1px solid var(--line); }
    .section-head { max-width: 710px; margin-bottom: 30px; }
    .section-kicker { color: var(--green); font-size: 13px; font-weight: 750; }
    h2 { margin: 7px 0 10px; font-size: clamp(25px, 3vw, 36px); line-height: 1.3; }
    .section-head p { margin: 0; color: var(--muted); }
    .split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
    .quote-panel {
      padding: 30px; border-left: 4px solid var(--coral);
      background: var(--coral-soft); border-radius: 0 var(--radius) var(--radius) 0;
    }
    .quote-panel p { margin: 0; font-size: 20px; font-weight: 650; line-height: 1.55; }
    .quote-panel span { display: block; margin-top: 13px; color: var(--muted); font-size: 14px; }
    .check-list { display: grid; gap: 16px; margin: 0; padding: 0; list-style: none; }
    .check-list li { display: grid; grid-template-columns: 28px 1fr; gap: 12px; }
    .check {
      display: grid; place-items: center; width: 26px; height: 26px;
      border-radius: 50%; color: var(--green); background: var(--mint); font-weight: 800;
    }
    .check-list strong { display: block; margin-bottom: 2px; }
    .check-list span:last-child { color: var(--muted); font-size: 14px; }
    .topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .topic {
      min-height: 186px; padding: 24px; border: 1px solid var(--line);
      border-radius: var(--radius); background: white; transition: transform .2s, box-shadow .2s;
    }
    .topic:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
    .topic-number { color: var(--green); font-size: 13px; font-weight: 800; }
    .topic h3 { margin: 11px 0 7px; font-size: 19px; }
    .topic p { margin: 0; color: var(--muted); font-size: 14px; }
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
    .step { position: relative; padding: 18px 22px 18px 0; border-top: 2px solid #b9d4c7; counter-increment: step; }
    .step::before { content: "0" counter(step); color: var(--green); font-weight: 800; font-size: 14px; }
    .step h3 { margin: 8px 0 5px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .alert-band { padding: 34px; border-radius: var(--radius); background: var(--green-dark); color: white; }
    .alert-band h2 { margin-top: 0; font-size: 27px; }
    .alert-band p { max-width: 820px; margin: 0; color: #d6e8df; }
    .resource-list { display: grid; border-top: 1px solid var(--line); }
    .resource-item {
      display: grid; grid-template-columns: 190px 1fr; gap: 24px;
      padding: 20px 0; border-bottom: 1px solid var(--line);
    }
    .resource-item strong { color: var(--green-dark); }
    .resource-item p { margin: 0; color: var(--muted); }
    .closing { background: #e9f2ed; }
    .closing-layout { display: flex; align-items: center; justify-content: space-between; gap: 26px; }
    .closing-layout p { max-width: 700px; margin: 0; color: var(--muted); }
    .site-footer { padding: 28px 0; background: #202b2a; color: #e8efec; }
    .footer-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .footer-brand { font-weight: 750; }
    .footer-note { margin: 0; color: #bdcbc5; font-size: 13px; }
    .footer-links { display: flex; gap: 18px; color: #d8e2dd; font-size: 13px; }
    .footer-links a:hover { color: white; text-decoration: underline; }
    @media (max-width: 900px) {
      .hero-layout { grid-template-columns: 1fr 1.05fr; gap: 18px; }
      .hero-art { min-height: 350px; }
      .steps { grid-template-columns: repeat(2, 1fr); gap: 14px 24px; }
      .topic-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .container { width: min(100% - 32px, var(--content)); }
      .nav { min-height: 64px; }
      .brand { font-size: 14px; }
      .brand-mark { width: 32px; height: 32px; }
      .nav-links { gap: 14px; }
      .nav-links a { font-size: 13px; }
      .hero { padding: 30px 0 26px; }
      .hero-layout { display: flex; flex-direction: column; align-items: stretch; }
      .hero-copy { padding: 8px 0; }
      h1 { font-size: 36px; }
      .hero-art { min-height: 290px; clip-path: none; padding: 22px; }
      .principle-row { grid-template-columns: 1fr; }
      .principle { padding: 15px 18px; }
      main section { padding: 46px 0; }
      .split { grid-template-columns: 1fr; gap: 24px; }
      .topic-grid { grid-template-columns: 1fr; }
      .topic { min-height: auto; }
      .steps { grid-template-columns: 1fr; gap: 9px; }
      .step { padding: 15px 0; }
      .resource-item { grid-template-columns: 1fr; gap: 5px; }
      .closing-layout, .footer-row { align-items: flex-start; flex-direction: column; }
      .footer-links { flex-wrap: wrap; }
      .alert-band { padding: 24px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
    }