:root {
    --bg: #0c0c0d;
    --bg-2: #141416;
    --ink: #ece8e1;
    --muted: #9a948a;
    --line: #2a2926;
    --gold: #c4a574;
    --gold-ink: #1a160f;
    --radius: 0;
    --max: 1180px;
    --rail: 220px;
    --bar: 64px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    overflow-wrap: anywhere;
    line-height: 1.6;
    font-size: 16px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--gold);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.skip {
    position: absolute;
    left: -999px;
    top: 0;
}

.skip:focus {
    left: 12px;
    top: 12px;
    background: var(--gold);
    color: var(--gold-ink);
    padding: 8px 12px;
    z-index: 40;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    height: var(--bar);
    background: rgba(12, 12, 13, 0.92);
    border-bottom: 1px solid var(--line);
}

.topbar-inner {
    max-width: calc(var(--max) + var(--rail) + 48px);
    margin: 0 auto;
    padding: 0 20px;
    height: var(--bar);
    display: flex;
    align-items: center;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--ink);
    font-weight: 600;
    letter-spacing: 0.02em;
    text-decoration: none;
    white-space: nowrap;
}

.desk-nav {
    display: none;
    gap: 20px;
    flex: 1;
}

.desk-nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.92rem;
}

.desk-nav a:hover {
    color: var(--ink);
}

.top-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang {
    background: transparent;
    border: 1px solid var(--line);
    color: var(--ink);
    padding: 8px 12px;
    cursor: pointer;
    font: inherit;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    font: inherit;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.98);
}

.btn-fill {
    background: var(--gold);
    color: var(--gold-ink);
}

.btn-fill:hover {
    text-decoration: none;
    filter: brightness(1.05);
}

.btn-line,
.btn-ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--line);
}

.btn-ghost {
    display: none;
}

.menu-btn {
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    padding: 10px;
    cursor: pointer;
}

.menu-btn span {
    display: block;
    height: 1px;
    background: var(--ink);
}

.sheet {
    background: var(--bg-2);
    border-bottom: 1px solid var(--line);
    padding: 12px 20px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sheet[hidden] {
    display: none;
}

.sheet a {
    color: var(--ink);
    text-decoration: none;
}

.shell {
    max-width: calc(var(--max) + var(--rail) + 48px);
    margin: 0 auto;
    padding: 0 20px 64px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

.rail {
    display: none;
}

.hero {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 28px;
    min-height: auto;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--gold);
    font-size: 0.78rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

h1 {
    margin: 0;
    line-height: 1.05;
}

.h1-cn {
    display: block;
    font-size: clamp(2.4rem, 8vw, 4.4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
}

.h1-en {
    display: block;
    margin-top: 6px;
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--muted);
}

.lede {
    max-width: 38ch;
    color: var(--muted);
    margin: 16px 0 22px;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.hero-frame img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border: 1px solid var(--line);
}

figcaption,
.note {
    color: var(--muted);
    font-size: 0.85rem;
    margin-top: 8px;
}

.meta-strip {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.meta-strip span {
    display: block;
    color: var(--muted);
    font-size: 0.78rem;
}

.block {
    padding: 56px 0 8px;
    border-top: 1px solid var(--line);
}

.block h2 {
    margin: 0 0 14px;
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    letter-spacing: -0.02em;
}

.measure {
    max-width: 65ch;
    color: var(--muted);
}

.split {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 28px;
}

.split img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border: 1px solid var(--line);
}

.plain {
    padding-left: 1.1rem;
    color: var(--ink);
}

.keys {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    margin-top: 24px;
    border: 1px solid var(--line);
}

.key {
    display: grid;
    grid-template-columns: 88px 1fr;
    gap: 16px;
    align-items: start;
    padding: 16px;
    border-bottom: 1px solid var(--line);
}

.key:last-child {
    border-bottom: 0;
}

kbd {
    font-family: ui-monospace, Consolas, monospace;
    font-size: 0.8rem;
    border: 1px solid var(--gold);
    color: var(--gold);
    padding: 4px 8px;
}

.key p {
    margin: 0;
    color: var(--muted);
}

.wide {
    margin: 32px 0 0;
}

.wide img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border: 1px solid var(--line);
}

.path {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 16px;
    padding: 24px 0;
    border-bottom: 1px solid var(--line);
}

.path-id {
    font-size: 1.4rem;
    color: var(--gold);
    font-weight: 600;
}

.path h3 {
    margin: 0 0 8px;
}

.path p {
    color: var(--muted);
    max-width: 62ch;
}

.spec-hero {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 24px;
}

.spec-hero article {
    background: var(--bg-2);
    border: 1px solid var(--line);
    padding: 24px;
}

.big {
    font-size: 2.6rem;
    margin: 8px 0;
    letter-spacing: -0.04em;
}

.spec-groups {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 28px;
}

.spec-groups p {
    margin: 6px 0;
    color: var(--muted);
}

.faq details {
    border-bottom: 1px solid var(--line);
    padding: 14px 0;
}

.faq summary {
    cursor: pointer;
    font-weight: 600;
    list-style: none;
}

.faq summary::-webkit-details-marker {
    display: none;
}

.faq details p {
    color: var(--muted);
    max-width: 65ch;
}

.foot {
    border-top: 1px solid var(--line);
    padding: 40px 20px 28px;
    background: var(--bg-2);
}

.foot-grid {
    max-width: var(--max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.foot-grid a,
.foot-grid p {
    display: block;
    color: var(--muted);
    margin: 0 0 8px;
}

.brand-foot {
    color: var(--ink) !important;
    font-weight: 600;
}

.copy {
    max-width: var(--max);
    margin: 28px auto 0;
    color: var(--muted);
    font-size: 0.82rem;
}

@media (min-width: 768px) {
    .desk-nav {
        display: flex;
    }

    .btn-ghost {
        display: inline-flex;
    }

    .menu-btn,
    .sheet {
        display: none !important;
    }

    .hero {
        grid-template-columns: 0.9fr 1.1fr;
        align-items: end;
        gap: 32px;
        padding-top: 36px;
    }

    .meta-strip {
        grid-template-columns: repeat(3, 1fr);
    }

    .keys {
        grid-template-columns: 1fr 1fr;
    }

    .key:nth-child(5) {
        grid-column: 1 / -1;
    }

    .spec-hero,
    .spec-groups,
    .foot-grid {
        grid-template-columns: 1fr 1fr;
    }

    .foot-grid {
        grid-template-columns: 1.4fr 1fr 1fr;
    }
}

@media (min-width: 1100px) {
    .shell {
        grid-template-columns: var(--rail) minmax(0, 1fr);
        gap: 48px;
        padding-top: 12px;
    }

    .rail {
        display: block;
        position: sticky;
        top: calc(var(--bar) + 16px);
        align-self: start;
        padding-top: 24px;
    }

    .rail-kicker {
        margin: 0 0 12px;
        color: var(--muted);
        font-size: 0.75rem;
    }

    .chapters {
        margin: 0;
        padding: 0;
        list-style: none;
    }

    .chapters a {
        display: block;
        color: var(--muted);
        text-decoration: none;
        padding: 8px 0;
        border-bottom: 1px solid var(--line);
        font-size: 0.88rem;
    }

    .chapters a:hover,
    .chapters a.is-on {
        color: var(--ink);
    }

    .split {
        grid-template-columns: 0.9fr 1.1fr;
        align-items: center;
    }

    .keys {
        grid-template-columns: repeat(5, 1fr);
    }

    .key {
        grid-template-columns: 1fr;
        border-bottom: 0;
        border-right: 1px solid var(--line);
    }

    .key:last-child,
    .key:nth-child(5) {
        grid-column: auto;
        border-right: 0;
    }
}

.site-title{font-size:.78rem;font-weight:700;max-width:min(58vw,520px);display:inline-block;overflow-wrap:anywhere;}
.dl-pair { display:inline-flex; flex-wrap:wrap; gap:10px; align-items:center; vertical-align:middle; }
.btn-primary-gold, .btn-gift {
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 16px; border:0; cursor:pointer;
  font: inherit; font-weight:700; font-size:0.92rem;
  text-decoration:none; white-space:nowrap; border-radius:8px;
  line-height:1.2;
}
.btn-primary-gold { background:#c9a227; color:#1a1408; }
.btn-primary-gold:hover { filter:brightness(1.08); text-decoration:none; color:#1a1408; }
.btn-gift { background:#7a1f2b; color:#fff; }
.btn-gift:hover { filter:brightness(1.08); }
.dl-btn-icon, .gift-btn-icon { font-size:1rem; }
.gift-modal[hidden] { display:none !important; }
.gift-modal { position:fixed; inset:0; z-index:9999; display:flex; align-items:center; justify-content:center; padding:16px; }
.gift-modal-mask { position:absolute; inset:0; background:rgba(0,0,0,.62); }
.mdl-card {
  position:relative; z-index:1; width:min(440px, 100%);
  background:#161616; color:#f3efe6; border-radius:16px; padding:22px 22px 18px;
  font-family: system-ui, "Segoe UI", sans-serif;
}
.mdl-close {
  position:absolute; top:10px; right:12px; width:36px; height:36px;
  border:0; background:transparent; color:#ccc; font-size:28px; cursor:pointer; line-height:1;
}
.mdl-head { text-align:center; padding-top:8px; }
.mdl-icon-wrap { width:52px; height:52px; margin:0 auto 10px; color:#c9a227; }
.mdl-icon-wrap svg { width:100%; height:100%; }
.mdl-title { margin:0; font-size:1.35rem; }
.mdl-subtitle { margin:4px 0 0; letter-spacing:.14em; font-size:.72rem; color:#c9a227; }
.mdl-desc { font-size:.95rem; line-height:1.6; color:#ddd; }
.gift-code-box {
  display:flex; justify-content:space-between; align-items:center; gap:12px;
  background:#2a2110; border:1px solid #c9a227; border-radius:10px; padding:12px 14px; cursor:pointer;
}
.gift-code-label { display:block; font-size:.72rem; color:#c9a227; }
.gift-code-value { display:block; font-size:1.4rem; font-weight:800; letter-spacing:.08em; }
.gift-code-copy { font-size:.8rem; color:#c9a227; white-space:nowrap; }
.gift-code-hint { font-size:.8rem; color:#999; margin:8px 0 0; }
.mdl-actions { display:flex; flex-direction:column; gap:8px; margin-top:16px; }
.mdl-btn {
  display:flex; align-items:center; justify-content:center; gap:8px;
  padding:12px; border-radius:10px; text-decoration:none; font-weight:700; border:0; cursor:pointer; font:inherit;
}
.mdl-btn svg { width:18px; height:18px; }
.mdl-btn-primary { background:#c9a227; color:#1a1408; }
.mdl-btn-secondary { background:#2a2a2a; color:#eee; }