:root {
      --ink: #0e1016;
      --ink-80: rgba(14,16,22,0.80);
      --ink-40: rgba(14,16,22,0.40);
      --ink-12: rgba(14,16,22,0.12);
      --ink-6: rgba(14,16,22,0.06);
      --paper: #f8f6f1;
      --accent-a: #0b7c5e;
      --accent-a-pale: #e4f5ef;
      --accent-a-light: #52c4a0;
      --accent-b: #3a2faa;
      --accent-b-pale: #eceaff;
      --accent-b-light: #8b83e0;
      --serif: 'DM Serif Display', Georgia, serif;
      --sans: 'DM Sans', Helvetica, Arial, sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body { font-family: var(--sans); font-weight: 300; background: var(--paper); color: var(--ink); line-height: 1.65; font-size: 16px; -webkit-font-smoothing: antialiased; }
    a { color: inherit; text-decoration: none; }
    .wrap { max-width: 1100px; margin: 0 auto; padding: 0 40px; }

    /* NAV */
    nav { position: sticky; top: 0; z-index: 100; padding: 18px 0; border-bottom: 1px solid var(--ink-12); background: rgba(248,246,241,0.90); backdrop-filter: blur(14px); }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; }
    .logo { display: flex; align-items: center; gap: 13px; }
    .logo-svg { flex-shrink: 0; }
    .logo-text { display: flex; flex-direction: column; gap: 1px; }
    .logo-name { font-weight: 500; font-size: 1.05rem; letter-spacing: 0.06em; color: var(--ink); }
    .logo-tagline { font-size: 0.72rem; letter-spacing: 0.08em; color: var(--ink-40); }
    .nav-links { display: flex; gap: 34px; }
    .nav-links a { font-size: 0.92rem; color: var(--ink-80); transition: color 0.2s; }
    .nav-links a:hover { color: var(--ink); }
    @media (max-width: 580px) { .wrap { padding: 0 20px; } .nav-links { gap: 18px; } .logo-tagline { display: none; } }

    /* HERO */
    .hero { padding: 90px 0 80px; }
    .hero-split { display: grid; grid-template-columns: 1fr 380px; gap: 64px; align-items: center; }
    @media (max-width: 960px) { .hero-split { grid-template-columns: 1fr; } .hero-right { display: none; } }

    /* ARTICLE PREVIEW CARD */
    .hero-article-card { border: 1px solid var(--ink-12); border-radius: 20px; padding: 32px; background: white; position: relative; overflow: hidden; }
    html.dark .hero-article-card { background: #1e2028; }
    .hero-article-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--accent-a-light), var(--accent-b-light)); }
    .hac-label { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent-a); margin-bottom: 16px; }
    .hac-title { font-family: var(--serif); font-size: 1.35rem; line-height: 1.35; letter-spacing: -0.01em; margin-bottom: 16px; color: var(--ink); }
    .hac-excerpt { font-size: 0.93rem; color: var(--ink-80); line-height: 1.8; margin-bottom: 24px; display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
    .hac-link { display: inline-flex; align-items: center; gap: 6px; font-size: 0.88rem; color: var(--accent-a); font-weight: 500; transition: gap 0.2s; }
    .hac-link:hover { gap: 10px; }

    /* ① eyebrow — 前後各一條橫線 */
    .hero-eyebrow {
      display: inline-flex; align-items: center; gap: 10px;
      font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase;
      color: var(--ink-40); margin-bottom: 30px;
    }
    .hero-eyebrow::before,
    .hero-eyebrow::after { content: ''; width: 22px; height: 1px; background: var(--ink-40); flex-shrink: 0; }

    /* ② h1 — "真正" 用 span 上色，不斜體 */
    .hero h1 {
      font-family: var(--serif);
      font-size: clamp(2.8rem, 4.5vw, 5rem);
      line-height: 1.0; letter-spacing: -0.02em;
      margin-bottom: 28px; max-width: 16ch;
    }
    .hero h1 .hl { font-style: normal; color: var(--accent-a-light); }

    .hero-desc { font-size: 1.05rem; color: var(--ink-80); line-height: 1.8; max-width: 560px; margin-bottom: 48px; }

    /* ③ hero-tracks — 主線用淺綠，夥伴/延伸提示保持原色 */
    .hero-tracks { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 660px; }
    .hero-track { padding: 22px 24px; border-radius: 18px; border: 1px solid var(--ink-12); }
    .hero-track.a { background: var(--accent-a-pale); border-color: rgba(11,124,94,0.18); }
    .hero-track.b { background: var(--accent-b-pale); border-color: rgba(58,47,170,0.18); }
    .ht-label { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 8px; }
    /* ③ 兩條主線 label 都用淺綠 */
    .hero-track.a .ht-label,
    .hero-track.b .ht-label { color: var(--accent-a); }
    .ht-title { font-weight: 500; font-size: 0.98rem; margin-bottom: 6px; }
    .ht-ext { font-size: 0.84rem; color: var(--ink-40); }
    @media (max-width: 640px) { .hero { padding: 60px 0 56px; } .hero-tracks { grid-template-columns: 1fr; } }

    /* KNOWLEDGE LINK */
    .hero-kb { margin-top: 28px; }
    .hero-kb a { display: inline-flex; align-items: center; gap: 8px; font-size: 0.92rem; color: var(--accent-a); border: 1px solid rgba(11,124,94,0.3); border-radius: 10px; padding: 10px 20px; transition: background 0.2s, border-color 0.2s; }
    .hero-kb a:hover { background: var(--accent-a-pale); border-color: rgba(11,124,94,0.5); }

    /* RULE */
    .rule { border: none; border-top: 1px solid var(--ink-12); }

    /* SECTION */
    .section { padding: 84px 0; }
    .section-label { font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-40); margin-bottom: 14px; }
    .section-title { font-family: var(--serif); font-size: clamp(1.9rem, 3vw, 3rem); line-height: 1.08; letter-spacing: -0.02em; margin-bottom: 18px; }
    .section-title em { font-style: italic; }

    /* ③ services header — 主線淺綠，夥伴淺紫 */
    .section-title .hl-a { font-style: normal; color: var(--accent-a-light); }
    .section-title .hl-b { font-style: italic; color: var(--accent-b-light); }

    .section-sub { font-size: 1.02rem; color: var(--ink-80); line-height: 1.8; max-width: 520px; }

    /* SERVICES */
    .services-header { margin-bottom: 52px; }
    .service-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
    @media (max-width: 680px) { .service-cols { grid-template-columns: 1fr; } }
    .service-col { border-radius: 24px; overflow: hidden; border: 1px solid var(--ink-12); background: white; }
    .service-col-head { padding: 26px 28px 20px; border-bottom: 1px solid var(--ink-6); }
    .col-track-label { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 500; margin-bottom: 8px; }
    .col-track-label.a { color: var(--accent-a); }
    .col-track-label.b { color: var(--accent-b); }
    .col-track-title { font-family: var(--serif); font-size: 1.45rem; font-style: italic; line-height: 1.15; }
    .service-main { padding: 24px 28px; border-bottom: 1px solid var(--ink-6); }
    .service-main-name { font-weight: 500; font-size: 1.0rem; margin-bottom: 10px; }
    .service-main-desc { font-size: 0.9rem; color: var(--ink-80); line-height: 1.72; }
    .service-ext { padding: 20px 28px; background: var(--ink-6); }
    .ext-label { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-40); margin-bottom: 8px; }
    .ext-name { font-weight: 500; font-size: 0.92rem; margin-bottom: 6px; }
    .ext-desc { font-size: 0.85rem; color: var(--ink-40); line-height: 1.65; }

    /* WHY */
    .why-block { background: var(--ink); color: var(--paper); border-radius: 32px; padding: 68px 60px; }
    @media (max-width: 640px) { .why-block { padding: 44px 26px; border-radius: 22px; } }
    .why-block .section-label { color: rgba(248,246,241,0.30); }
    .why-block .section-title { color: var(--paper); margin-bottom: 48px; }
    .why-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 36px; }
    @media (max-width: 640px) { .why-grid { grid-template-columns: 1fr; gap: 28px; } }
    .why-mark { font-size: 1.4rem; margin-bottom: 14px; opacity: 0.5; }
    .why-title { font-weight: 500; font-size: 1rem; margin-bottom: 10px; }
    .why-body { font-size: 0.88rem; color: rgba(248,246,241,0.50); line-height: 1.78; }

    /* PROCESS */
    .process-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; margin-top: 48px; }
    @media (max-width: 640px) { .process-grid { grid-template-columns: 1fr; } }
    .process-step { padding: 28px 26px; border: 1px solid var(--ink-12); border-radius: 20px; background: white; position: relative; }
    .step-num { font-family: var(--serif); font-size: 3.2rem; line-height: 1; font-style: italic; color: rgba(14,16,22,0.06); position: absolute; top: 16px; right: 20px; }
    .step-title { font-weight: 500; font-size: 1.0rem; margin-bottom: 10px; }
    .step-desc { font-size: 0.88rem; color: var(--ink-80); line-height: 1.72; }

    /* CONTACT */
    .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: start; padding: 84px 0; border-top: 1px solid var(--ink-12); }
    @media (max-width: 680px) { .contact-grid { grid-template-columns: 1fr; gap: 44px; } }
    #contact-desc { font-size: 0.95rem; color: var(--ink-80); margin-top: 14px; line-height: 1.8; }

    /* CONTACT FORM */
    .contact-form { display: flex; flex-direction: column; gap: 16px; }
    .cf-row { display: flex; flex-direction: column; gap: 6px; }
    .cf-label { font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-80); font-weight: 500; }
    .cf-input {
      width: 100%; padding: 12px 14px; border-radius: 10px;
      border: 1px solid var(--ink-12); background: white;
      font-family: var(--sans); font-size: 0.95rem; color: var(--ink);
      transition: border-color 0.18s, box-shadow 0.18s; outline: none;
    }
    .cf-input::placeholder { color: var(--ink-40); }
    .cf-input:focus { border-color: var(--accent-a); box-shadow: 0 0 0 3px rgba(11,124,94,0.10); }
    .cf-textarea { resize: vertical; min-height: 110px; }
    .cf-submit {
      align-self: flex-start; margin-top: 6px; padding: 12px 32px; border-radius: 999px;
      background: var(--accent-a); color: white; border: none;
      font-family: var(--sans); font-size: 0.93rem; font-weight: 500;
      cursor: pointer; transition: opacity 0.2s;
    }
    .cf-submit:hover { opacity: 0.82; }
    .cf-submit:disabled { opacity: 0.50; cursor: not-allowed; }
    .cf-status { font-size: 0.90rem; line-height: 1.6; padding: 10px 14px; border-radius: 8px; }
    .cf-success { color: var(--accent-a); background: var(--accent-a-pale); }
    .cf-error { color: #c0392b; background: rgba(192,57,43,0.08); }
    html.dark .cf-input { background: #1e2028; }

    /* FOOTER */
    .footer { border-top: 1px solid var(--ink-12); padding: 36px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
    .footer-brand { font-size: 0.88rem; font-weight: 500; }
    .footer-copy { font-size: 0.80rem; color: var(--ink-40); }

    /* ANIM */
    @keyframes fadeUp { from { opacity:0; transform:translateY(20px); } to { opacity:1; transform:translateY(0); } }
    .hero-eyebrow { opacity:0; animation: fadeUp 0.6s ease 0.05s forwards; }
    .hero h1      { opacity:0; animation: fadeUp 0.7s ease 0.18s forwards; }
    .hero-desc    { opacity:0; animation: fadeUp 0.7s ease 0.30s forwards; }
    .hero-tracks  { opacity:0; animation: fadeUp 0.7s ease 0.42s forwards; }

    /* LANG SWITCHER */
    .nav-right { display: flex; align-items: center; gap: 20px; }
    .lang-switcher { position: relative; }
    .lang-btn { display: flex; align-items: center; padding: 6px 10px; border-radius: 8px; border: 1px solid var(--ink-12); background: transparent; cursor: pointer; color: var(--ink-80); font-family: var(--sans); transition: background 0.2s; }
    .lang-btn:hover { background: var(--ink-6); }
    .lang-menu { display: none; position: absolute; right: 0; top: calc(100% + 6px); background: white; border: 1px solid var(--ink-12); border-radius: 12px; overflow: hidden; box-shadow: 0 4px 20px rgba(14,16,22,0.10); min-width: 130px; z-index: 200; }
    .lang-menu.open { display: block; }
    .lang-opt { display: block; width: 100%; padding: 10px 16px; text-align: left; background: none; border: none; font-size: 0.88rem; color: var(--ink-80); cursor: pointer; font-family: var(--sans); transition: background 0.15s; }
    .lang-opt:hover { background: var(--ink-6); }
    .lang-opt.active { color: var(--ink); font-weight: 500; background: var(--ink-6); }

    /* DARK MODE */
    html.dark {
      --ink: #e8e5e0;
      --ink-80: rgba(232,229,224,0.80);
      --ink-40: rgba(232,229,224,0.40);
      --ink-12: rgba(232,229,224,0.12);
      --ink-6: rgba(232,229,224,0.06);
      --paper: #12141a;
      --accent-a-pale: rgba(82,196,160,0.12);
      --accent-b-pale: rgba(139,131,224,0.12);
    }
    html.dark nav { background: rgba(18,20,26,0.90); }
    html.dark .service-col,
    html.dark .process-step { background: #1e2028; }
    html.dark .copy-btn { background: #1e2028; }
    html.dark .lang-menu { background: #1e2028; }
    html.dark .why-block { background: #1e2028; color: #e8e5e0; }
    html.dark .why-block .section-title { color: #e8e5e0; }
    html.dark .step-num { color: rgba(232,229,224,0.06); }

    /* CJK / SCRIPT FONT OVERRIDES */
    :lang(zh-Hans) { font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', var(--sans); }
    :lang(th)      { font-family: 'Noto Sans Thai', Tahoma, sans-serif; }

    /* THEME TOGGLE */
    .theme-btn {
      display: flex; align-items: center; justify-content: center;
      width: 34px; height: 34px; border-radius: 8px;
      border: 1px solid var(--ink-12); background: transparent;
      cursor: pointer; color: var(--ink-80); transition: background 0.2s, color 0.2s;
    }
    .theme-btn:hover { background: var(--ink-6); color: var(--ink); }
    .theme-btn .icon-sun { display: inline; }
    .theme-btn .icon-moon { display: none; }
    html.dark .theme-btn .icon-sun { display: none; }
    html.dark .theme-btn .icon-moon { display: inline; }