/* ============================================================
   Swiss Ledger Design System — 单据纸本
   纸面底 · 墨线栅格 · 直角卡片 · 单一信号橘红 · 等宽编号
   ============================================================ */

:root {
    /* 纸面 */
    --paper: #f2efe8;
    --paper-2: #e8e4da;
    --card: #fffefb;

    /* 墨 */
    --ink: #14120f;
    --ink-2: #55504a;
    --ink-3: #8d867a;

    /* 线 */
    --line: rgba(20, 18, 15, 0.14);
    --line-2: rgba(20, 18, 15, 0.28);

    /* 信号与状态 */
    --signal: #e2350c;
    --signal-dark: #b82a09;
    --signal-tint: #fbe7e0;
    --sea: #0e4f45;
    --sea-on-ink: #4ec9a8;
    --flag: #a97400;

    /* 反白 */
    --on-ink: #f2efe8;
    --on-ink-2: #a9a29a;

    /* 字体 */
    --font-display: 'Archivo', 'Noto Sans SC', system-ui, sans-serif;
    --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', sans-serif;
    --font-mono: 'IBM Plex Mono', 'Noto Sans SC', ui-monospace, SFMono-Regular, Menlo, monospace;

    /* 动效 */
    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
    --t-fast: 0.16s var(--ease);
    --t-med: 0.30s var(--ease);

    /* 尺寸 */
    --rail-h: 34px;
    --nav-h: 70px;
    --space-sec: clamp(72px, 9vw, 128px);
    --shell: 1240px;
    --shell-wide: 1440px;
    --gutter: 26px;
    --edge: max(var(--gutter), calc(50% - 720px));
    --shadow-off: 6px 6px 0 var(--ink);
}

/* ========== Reset ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    background: var(--paper);
    scroll-padding-top: calc(var(--rail-h) + var(--nav-h) + 12px);
}
body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.85;
    font-weight: 400;
    color: var(--ink-2);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* 固定 12 栏竖发丝线 */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    margin: 0 auto;
    max-width: var(--shell-wide);
    pointer-events: none;
    opacity: 0.7;
    background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px calc(100% / 12));
    -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.4) 55%, transparent 100%);
    mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.4) 55%, transparent 100%);
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
strong { font-weight: 600; color: var(--ink); }
sup { font-size: 0.55em; vertical-align: super; }

::selection { background: var(--signal); color: #fff; }

:focus-visible {
    outline: 2px solid var(--signal);
    outline-offset: 3px;
}

/* ========== 等宽字与标签 ========== */
.mono, .mono-mini {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}
.mono-mini {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-3);
}
.hl { color: var(--signal); }
.hl-box {
    background: var(--ink);
    color: var(--on-ink);
    padding: 0 0.16em 0.04em;
}
.band--ink .hl-box { background: var(--signal); color: #fff; }

/* ========== 版心 ========== */
.shell {
    width: 100%;
    max-width: var(--shell);
    margin: 0 auto;
    padding: 0 var(--gutter);
}
.shell--wide { max-width: var(--shell-wide); }
main { padding-top: calc(var(--rail-h) + var(--nav-h)); }
section { position: relative; }

.sec { padding: var(--space-sec) 0; }
.sec--tight { padding: clamp(52px, 6vw, 88px) 0; }
.band {
    background: var(--paper-2);
    border-top: 1px solid var(--line-2);
    border-bottom: 1px solid var(--line-2);
}
.band--ink {
    background: var(--ink);
    border-top: 1px solid var(--ink);
    border-bottom: 1px solid var(--ink);
    color: var(--on-ink-2);
    background-image: repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.035) 0 1px, transparent 1px 9px);
}
.band--ink .sec-title, .band--ink .stat-num, .band--ink h2, .band--ink h3, .band--ink h4 { color: var(--on-ink); }
.band--ink .sec-lead, .band--ink p { color: var(--on-ink-2); }
.band--ink .mono-mini, .band--ink .overline { color: var(--on-ink-2); }
.band--ink .overline::before { background: var(--signal); }
.band--ink .card {
    background: transparent;
    border-color: rgba(242, 239, 232, 0.24);
}
.band--ink .spec-row, .band--ink .ledger-row { border-color: rgba(242, 239, 232, 0.2); }
.band--ink .spec-val, .band--ink .ledger-title { color: var(--on-ink); }
.band--ink .spec-key, .band--ink .ledger-idx, .band--ink .ledger-meta { color: var(--on-ink-2); }
.band--ink .overline-rule, .cta-band--ink .overline-rule { background: rgba(242, 239, 232, 0.28); }
.band--ink .pt-item::before { background: var(--signal); }
.band--ink .hl, .cta-band--ink .hl { color: #ff6a3d; }

.rule { height: 1px; border: 0; background: var(--line-2); }
.rule--ink { background: var(--ink); }

/* ========== 章节标题组 ========== */
.sec-head { margin-bottom: clamp(36px, 4.5vw, 58px); }
.sec-head--split {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 36px 48px;
    align-items: end;
}
.sec-head--rule {
    padding-top: 20px;
    border-top: 1px solid var(--ink);
}
.overline {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-3);
}
.overline::before {
    content: "";
    width: 8px;
    height: 8px;
    background: var(--signal);
    flex-shrink: 0;
}
.overline-rule {
    flex: 1;
    height: 1px;
    background: var(--line-2);
    min-width: 24px;
}
.overline--center { justify-content: flex-start; }

.sec-index {
    display: block;
    font-family: var(--font-mono);
    font-size: clamp(44px, 7vw, 92px);
    font-weight: 500;
    line-height: 0.85;
    letter-spacing: -0.05em;
    color: var(--ink);
}
.sec-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(26px, 3.2vw, 40px);
    line-height: 1.22;
    letter-spacing: -0.03em;
    color: var(--ink);
    text-wrap: balance;
    max-width: 24ch;
}
.sec-title--wide { max-width: 34ch; }
.sec-lead {
    font-size: 16px;
    line-height: 1.85;
    color: var(--ink-2);
    max-width: 62ch;
}
.sec-head--split .sec-lead { margin-bottom: 4px; }

/* ========== 卡片 ========== */
.card {
    position: relative;
    background: var(--card);
    border: 1px solid var(--line-2);
    border-radius: 0;
    transition: transform var(--t-med), box-shadow var(--t-med), border-color var(--t-med), background var(--t-med);
}
.card--pad { padding: clamp(22px, 2.4vw, 32px); }
.card--offset:hover {
    transform: translate(-3px, -3px);
    box-shadow: var(--shadow-off);
    border-color: var(--ink);
}
.card--ink { background: var(--ink); border-color: var(--ink); color: var(--on-ink-2); }
.card--ink h3, .card--ink h4 { color: var(--on-ink); }

/* ========== 标签 / 状态 ========== */
.label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 10px;
    border: 1px solid var(--line-2);
    border-radius: 0;
    background: transparent;
    font-family: var(--font-mono);
    font-size: 10.5px;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-2);
    white-space: nowrap;
}
.label i { font-size: 10px; color: var(--signal); }
.label--solid { background: var(--ink); border-color: var(--ink); color: var(--on-ink); }
.label--signal { background: var(--signal-tint); border-color: rgba(226, 53, 12, 0.3); color: var(--signal-dark); }
.label--live { color: var(--sea); border-color: rgba(14, 79, 69, 0.35); }
.label--live i { color: var(--sea); }
.label--flag { color: var(--flag); border-color: rgba(169, 116, 0, 0.35); }
.band--ink .label { border-color: rgba(242, 239, 232, 0.3); color: var(--on-ink); }

.pulse {
    display: inline-block;
    width: 7px;
    height: 7px;
    background: var(--sea-on-ink);
    flex-shrink: 0;
    animation: pulse-blink 1.8s steps(2, end) infinite;
}
.rail-live .pulse { background: var(--sea-on-ink); }
@keyframes pulse-blink {
    0%, 45% { opacity: 1; }
    50%, 100% { opacity: 0.25; }
}

/* ========== 账簿行 ========== */
.ledger { border-top: 1px solid var(--ink); }
.ledger-row {
    display: grid;
    grid-template-columns: minmax(0, auto) minmax(0, 1fr);
    gap: 6px 26px;
    padding: 22px 0;
    border-bottom: 1px solid var(--line-2);
    transition: background var(--t-fast), padding-left var(--t-fast);
}
.ledger-idx {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--ink-3);
    padding-top: 3px;
    transition: color var(--t-fast);
}
.ledger-title {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.4;
    color: var(--ink);
}
.ledger-text { font-size: 15px; line-height: 1.8; color: var(--ink-2); margin-top: 6px; }
.ledger-meta { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); }
.ledger-row:hover { background: var(--paper-2); }
.ledger-row:hover .ledger-idx { color: var(--signal); }

/* ========== 要点列表（方点） ========== */
.pt-list { display: grid; gap: 8px; margin-top: 16px; }
.pt-list--cols { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px 20px; }
.pt-item { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; line-height: 1.7; color: var(--ink-2); }
.pt-item::before {
    content: "";
    width: 6px;
    height: 6px;
    margin-top: 9px;
    background: var(--signal);
    flex-shrink: 0;
}
.pt-item--ink::before { background: var(--ink); }

/* ========== 规格表（等宽键值） ========== */
.spec-list { display: flex; flex-direction: column; }
.spec-row {
    display: grid;
    grid-template-columns: minmax(88px, 0.55fr) minmax(0, 1.45fr);
    gap: 18px;
    align-items: baseline;
    padding: 13px 0;
    border-bottom: 1px solid var(--line);
}
.spec-list--ruled { border-top: 1px solid var(--ink); }
.spec-row:last-child { border-bottom: none; }
.spec-list--ruled .spec-row:last-child { border-bottom: 1px solid var(--line); }
.spec-key {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-3);
}
.spec-key i { font-size: 11px; color: var(--signal); }
.spec-val { font-size: 15px; font-weight: 500; color: var(--ink); overflow-wrap: anywhere; }
a.spec-val { transition: color var(--t-fast); }
a.spec-val:hover { color: var(--signal); }

/* ========== 读数 ========== */
.stat-strip {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 1px solid var(--ink);
    border-bottom: 1px solid var(--ink);
}
.stat {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 26px 24px 24px;
    border-left: 1px solid var(--line-2);
}
.stat:first-child { border-left: none; padding-left: 0; }
.stat-num {
    font-family: var(--font-mono);
    font-size: clamp(30px, 3.6vw, 44px);
    font-weight: 500;
    line-height: 1;
    letter-spacing: -0.04em;
    color: var(--ink);
}
.stat-label { font-size: 13px; line-height: 1.6; color: var(--ink-2); }
.metric-num {
    font-family: var(--font-mono);
    font-size: clamp(28px, 3.4vw, 42px);
    font-weight: 500;
    line-height: 1;
    letter-spacing: -0.04em;
    color: var(--ink);
}
.metric-label { font-size: 13px; color: var(--ink-2); line-height: 1.6; }
.band--ink .stat { border-color: rgba(242, 239, 232, 0.22); }
.band--ink .stat-strip { border-color: var(--on-ink); }
.band--ink .stat-num, .band--ink .metric-num { color: var(--on-ink); }
.band--ink .stat-label, .band--ink .metric-label { color: var(--on-ink-2); }

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    height: 48px;
    padding: 0 22px;
    border: 1px solid var(--ink);
    border-radius: 0;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.01em;
    white-space: nowrap;
    color: var(--ink);
    background: transparent;
    transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.btn i { font-size: 12px; transition: transform var(--t-fast); }
.btn:hover i { transform: translateX(4px); }
.btn--solid { background: var(--ink); color: var(--on-ink); }
.btn--solid:hover { background: var(--signal); border-color: var(--signal); color: #fff; }
.btn--outline:hover { background: var(--ink); color: var(--on-ink); }
.btn--signal { background: var(--signal); border-color: var(--signal); color: #fff; }
.btn--signal:hover { background: var(--signal-dark); border-color: var(--signal-dark); }
.btn--quiet {
    height: auto;
    padding: 3px 0;
    border: 0;
    border-bottom: 1px solid var(--ink);
    font-size: 13.5px;
    color: var(--ink);
}
.btn--quiet:hover { color: var(--signal); border-color: var(--signal); }
.btn-lg { height: 54px; padding: 0 28px; font-size: 14.5px; }
.btn-block { width: 100%; }
.band--ink .btn { border-color: var(--on-ink); color: var(--on-ink); }
.band--ink .btn--solid { background: var(--on-ink); color: var(--ink); }
.band--ink .btn--solid:hover { background: var(--signal); border-color: var(--signal); color: #fff; }
.band--ink .btn--outline:hover { background: var(--on-ink); color: var(--ink); }

/* ========== 引文 ========== */
.quote {
    font-family: var(--font-display);
    font-size: clamp(19px, 2.1vw, 27px);
    font-weight: 600;
    line-height: 1.5;
    letter-spacing: -0.02em;
    color: var(--ink);
    text-wrap: pretty;
}
.band--ink .quote, .card--ink .quote { color: var(--on-ink); }

/* ========== 顶部状态条 + 导航 ========== */
.site-head {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}
.top-rail {
    height: var(--rail-h);
    background: var(--ink);
    color: var(--on-ink-2);
    display: flex;
    align-items: center;
}
.rail-inner {
    width: 100%;
    max-width: var(--shell-wide);
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}
.rail-track { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.rail-sep { color: rgba(242, 239, 232, 0.3); }
.rail-live { display: inline-flex; align-items: center; gap: 9px; color: var(--sea-on-ink); }

.main-nav {
    height: var(--nav-h);
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
    transition: height var(--t-med), background var(--t-med);
}
.site-head.scrolled .main-nav, .main-nav.scrolled { height: calc(var(--nav-h) - 10px); background: #f6f3ed; }
.nav-container {
    max-width: var(--shell-wide);
    margin: 0 auto;
    padding: 0 32px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 26px;
}

.brand { display: inline-flex; align-items: center; gap: 13px; }
.brand-glyph {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 0;
    background: var(--ink);
    color: var(--on-ink);
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 18px;
    flex-shrink: 0;
    transition: background var(--t-fast);
}
.brand:hover .brand-glyph { background: var(--signal); }
.brand-meta { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 16.5px;
    letter-spacing: -0.01em;
    color: var(--ink);
}
.brand-sub {
    font-family: var(--font-mono);
    font-size: 9px;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--ink-3);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 26px;
}
.nav-links a {
    position: relative;
    display: inline-flex;
    align-items: baseline;
    gap: 7px;
    padding: 6px 0;
    font-size: 14px;
    font-weight: 500;
    color: var(--ink-2);
    transition: color var(--t-fast);
}
.nav-idx {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--ink-3);
    transition: color var(--t-fast);
}
.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: var(--signal);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--t-med);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--ink); font-weight: 600; }
.nav-links a.active .nav-idx { color: var(--signal); }
.nav-links a.active::after { transform: scaleX(1); }

.nav-right { display: flex; align-items: center; gap: 12px; }
.language-switch { position: relative; }
.language-switch::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 12px;
}
.dropdown-trigger {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 8px 14px;
    border: 1px solid var(--ink);
    border-radius: 0;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink);
    transition: background var(--t-fast), color var(--t-fast);
}
.dropdown-trigger:hover { background: var(--ink); color: var(--on-ink); }
.dropdown-trigger i:first-child { font-size: 11px; color: var(--signal); }
.dropdown-trigger:hover i:first-child { color: inherit; }
.dropdown-trigger i:last-child { font-size: 9px; }
.dropdown-content {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    min-width: 168px;
    padding: 0;
    background: var(--card);
    border: 1px solid var(--ink);
    border-radius: 0;
    box-shadow: var(--shadow-off);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity var(--t-med), transform var(--t-med), visibility var(--t-med);
    z-index: 10;
}
.language-switch:hover .dropdown-content,
.language-switch.show .dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown-content a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 11px 14px;
    border-bottom: 1px solid var(--line);
    font-size: 14px;
    font-weight: 500;
    color: var(--ink-2);
    transition: background var(--t-fast), color var(--t-fast);
}
.dropdown-content a:last-child { border-bottom: none; }
.dropdown-content a:hover { background: var(--paper-2); color: var(--ink); }
.dropdown-content a.active { color: var(--signal); }
.lang-code { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; color: var(--ink-3); }

.mobile-menu-toggle { display: none; }

/* ========== 页脚（墨色通栏） ========== */
.site-foot {
    position: relative;
    margin-top: clamp(56px, 7vw, 92px);
    background: var(--ink);
    background-image: repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0 1px, transparent 1px 9px);
    color: var(--on-ink-2);
}
.site-foot::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--signal);
}
.foot-inner { padding: clamp(48px, 6vw, 76px) var(--gutter) 30px; }
.foot-top {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 0.9fr);
    gap: clamp(30px, 4vw, 56px);
    padding-bottom: 36px;
    border-bottom: 1px solid rgba(242, 239, 232, 0.22);
}
.foot-brand { display: flex; flex-direction: column; gap: 20px; }
.site-foot .brand-glyph { background: var(--on-ink); color: var(--ink); }
.site-foot .brand-name { color: var(--on-ink); }
.site-foot .brand-sub { color: var(--on-ink-2); }
.site-foot .brand:hover .brand-glyph { background: var(--signal); color: #fff; }
.site-foot .label, .site-foot .label mono { color: var(--on-ink); border-color: rgba(242, 239, 232, 0.3); }
.foot-desc { font-size: 14px; line-height: 1.9; color: var(--on-ink-2); max-width: 42ch; }
.foot-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.foot-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.foot-col { display: flex; flex-direction: column; gap: 16px; }
.foot-col-title {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--on-ink-2);
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(242, 239, 232, 0.22);
}
.foot-list { display: flex; flex-direction: column; gap: 11px; }
.foot-list a {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--on-ink-2);
    transition: color var(--t-fast);
}
.foot-list a::before {
    content: "";
    width: 5px;
    height: 5px;
    background: rgba(242, 239, 232, 0.3);
    transition: background var(--t-fast);
}
.foot-list a:hover { color: var(--on-ink); }
.foot-list a:hover::before { background: var(--signal); }
.foot-contact { display: flex; flex-direction: column; gap: 4px; }
.foot-contact .spec-list { border-top: none; }
.foot-contact .spec-row { border-bottom: 1px solid rgba(242, 239, 232, 0.18); padding: 11px 0; }
.foot-contact .spec-key { color: var(--on-ink-2); }
.foot-contact .spec-val { font-size: 14px; color: var(--on-ink); }
.foot-contact a.spec-val:hover { color: var(--signal); }
.foot-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-top: 24px;
    flex-wrap: wrap;
}
.foot-copy { font-size: 12.5px; color: var(--on-ink-2); }
.foot-copy .mono-mini { color: var(--on-ink-2); }
.foot-social { display: flex; gap: 10px; }
.foot-social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid rgba(242, 239, 232, 0.3);
    border-radius: 0;
    color: var(--on-ink);
    font-size: 13px;
    transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}
.foot-social-link:hover { background: var(--signal); border-color: var(--signal); color: #fff; }

/* ========== 底部 CTA ========== */
.cta-band {
    position: relative;
    overflow: hidden;
    padding: var(--space-sec) 0;
    border-top: 1px solid var(--ink);
    background: var(--paper-2);
}
.cta-band--ink {
    background: var(--ink);
    background-image: repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0 1px, transparent 1px 9px);
    color: var(--on-ink-2);
    border-top: 1px solid var(--ink);
}
.cta-band--ink .cta-title, .cta-band--ink h2 { color: var(--on-ink); }
.cta-band--ink .cta-note { color: var(--on-ink-2); }
.cta-band--ink .overline { color: var(--on-ink-2); }
.cta-band--ink .btn { border-color: var(--on-ink); color: var(--on-ink); }
.cta-band--ink .hl-box { background: var(--signal); color: #fff; }
.cta-band--ink .btn--solid { background: var(--on-ink); color: var(--ink); }
.cta-band--ink .btn--solid:hover { background: var(--signal); border-color: var(--signal); color: #fff; }
.cta-band--ink .cta-foot { border-color: rgba(242, 239, 232, 0.24); }
.cta-band--ink .mono-mini, .cta-band--ink .cta-foot span { color: var(--on-ink-2); }
.cta-band::before, .cta-band::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    pointer-events: none;
    border-color: var(--line-2);
}
.cta-band::before {
    top: 22px;
    left: var(--edge);
    border-left: 1px solid currentColor;
    border-top: 1px solid currentColor;
    opacity: 0.6;
}
.cta-band::after {
    bottom: 22px;
    right: var(--edge);
    border-right: 1px solid currentColor;
    border-bottom: 1px solid currentColor;
    opacity: 0.6;
}
.cta-inner { position: relative; z-index: 1; text-align: center; }
.cta-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(27px, 3.6vw, 46px);
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: var(--ink);
    max-width: 26ch;
    margin: 0 auto;
}
.cta-note {
    margin: 18px auto 0;
    font-size: 16px;
    line-height: 1.85;
    color: var(--ink-2);
    max-width: 58ch;
}
.cta-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 32px;
}
.cta-band--split .cta-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
    align-items: end;
    text-align: left;
}
.cta-band--split .cta-title,
.cta-band--split .cta-note { margin-left: 0; margin-right: 0; }
.cta-band--split .cta-actions {
    justify-content: flex-start;
    margin-top: 0;
    flex-direction: column;
    align-items: flex-start;
    padding-left: 32px;
    border-left: 1px solid var(--line-2);
}
.cta-band--ink.cta-band--split .cta-actions { border-color: rgba(242, 239, 232, 0.24); }
.cta-foot {
    position: relative;
    z-index: 1;
    margin-top: 46px;
    padding-top: 20px;
    border-top: 1px solid var(--line-2);
    display: flex;
    flex-wrap: wrap;
    gap: 12px 34px;
    justify-content: space-between;
}
.cta-band--slim { padding: clamp(52px, 6vw, 80px) 0; }
.cta-band--slim .cta-title { font-size: clamp(23px, 2.8vw, 34px); }

/* ========== 页首（内页共用） ========== */
.page-head {
    position: relative;
    padding: clamp(48px, 6vw, 88px) 0 clamp(36px, 4vw, 60px);
    border-bottom: 1px solid var(--line-2);
}
.page-head::before, .page-head::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    pointer-events: none;
    border-color: var(--line-2);
}
.page-head::before {
    top: 14px;
    left: var(--edge);
    border-left: 1px solid var(--line-2);
    border-top: 1px solid var(--line-2);
}
.page-head::after {
    bottom: 14px;
    right: var(--edge);
    border-right: 1px solid var(--line-2);
    border-bottom: 1px solid var(--line-2);
}
.page-head__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: 40px 48px;
    align-items: end;
}
.page-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(30px, 4.4vw, 56px);
    line-height: 1.14;
    letter-spacing: -0.035em;
    color: var(--ink);
    text-wrap: balance;
    max-width: 30ch;
}
.page-lead {
    margin-top: 20px;
    font-size: 16.5px;
    line-height: 1.85;
    color: var(--ink-2);
    max-width: 60ch;
}

/* ========== 响应式 ========== */
@media (max-width: 1080px) {
    :root { --gutter: 26px; }
    .rail-inner, .nav-container { padding: 0 26px; }
    .sec-head--split, .page-head__grid { grid-template-columns: 1fr; gap: 26px; align-items: start; }
    .stat-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .stat:nth-child(3) { border-left: none; padding-left: 0; }
    .stat { border-top: 1px solid var(--line-2); }
    .stat:nth-child(-n + 2) { border-top: none; }
    .foot-top { grid-template-columns: 1fr 1fr; }
    .foot-brand { grid-column: 1 / -1; }
    .cta-band--split .cta-inner { grid-template-columns: 1fr; }
    .cta-band--split .cta-actions { padding-left: 0; border-left: 0; margin-top: 26px; }
}

@media (max-width: 900px) {
    .top-rail { display: none; }
    :root { --nav-h: 66px; }
    .nav-links { display: none; }
    .pt-list--cols { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    :root { --nav-h: 62px; --gutter: 20px; }
    .rail-inner, .nav-container { padding: 0 20px; }
    .nav-links {
        display: none;
        position: fixed;
        top: var(--nav-h);
        left: 10px;
        right: 10px;
        padding: 6px 16px;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        border: 1px solid var(--ink);
        box-shadow: var(--shadow-off);
        background: var(--card);
    }
    .nav-links.active { display: flex; }
    .nav-links a {
        padding: 14px 0;
        border-bottom: 1px solid var(--line);
        font-size: 15px;
    }
    .nav-links a:last-child { border-bottom: none; }
    .nav-links a.active { color: var(--signal); }
    .mobile-menu-toggle {
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 5px;
        width: 42px;
        height: 42px;
        border: 1px solid var(--ink);
        border-radius: 0;
        background: transparent;
    }
    .mobile-menu-toggle span {
        display: block;
        width: 18px;
        height: 1.5px;
        background: var(--ink);
        transition: all var(--t-med);
    }
    .mobile-menu-toggle.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
    .mobile-menu-toggle.active span:nth-child(2) { opacity: 0; }
    .mobile-menu-toggle.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

    .brand-sub { display: none; }
    .ledger-row { grid-template-columns: 1fr; gap: 4px; }
    .stat-strip { grid-template-columns: 1fr; }
    .stat { border-left: none; padding-left: 0; }
    .stat:nth-child(2) { border-top: 1px solid var(--line-2); }
    .cta-actions { flex-direction: column; align-items: stretch; }
    .btn { width: 100%; }
    .foot-top { grid-template-columns: 1fr; }
    .foot-bottom { flex-direction: column; align-items: flex-start; }
    .spec-row { grid-template-columns: 1fr; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}