/* ============================================================
   一企通 · 设计系统 v3 —— 「深墨鎏金」
   理念：去除AI模板感，以艺术排版、材质纹理、优雅动效
         营造沉稳、高级、有温度的企业软件形象。
   约束：无紫色/无高饱和渐变/无emoji/尊重减弱动效偏好
   ============================================================ */

:root {
    /* ===== 核心色阶：深墨 ===== */
    --ink-900: #0B0F1A;
    --ink-800: #131927;
    --ink-700: #1E2738;
    --ink-600: #354056;
    --ink-500: #546070;
    --ink-400: #758291;
    --ink-300: #9BA5B1;
    --ink-200: #C5CBD3;
    --ink-100: #E2E6EB;

    /* ===== 暖金琥珀 accent ===== */
    --gold: #B8926A;
    --gold-600: #9A7852;
    --gold-400: #D4B896;
    --gold-100: #F5EDE3;
    --gold-50: #FBF7F2;

    /* ===== 品牌深蓝 ===== */
    --brand: #1A3A5C;
    --brand-600: #122A45;
    --brand-400: #3A5E82;
    --brand-100: #E8EEF4;
    --brand-50: #F3F6F9;

    /* ===== 语义色 ===== */
    --ok: #2D6A4F;
    --ok-bg: #E8F5E9;
    --warn: #B45309;
    --warn-bg: #FEF6E7;
    --danger: #9B2C2C;
    --danger-bg: #FEF2F2;

    /* ===== 表面与描边 ===== */
    --bg: #FAFAF8;
    --bg-alt: #F3F2EF;
    --bg-sunken: #EBEAE6;
    --bg-deep: #0B0F1A;
    --line: #E0DFDA;
    --line-soft: #EBEAE6;
    --line-strong: #C5CBD3;

    /* ===== 圆角：更锐利 ===== */
    --r-xs: 2px;
    --r-sm: 4px;
    --r-md: 6px;
    --r-lg: 10px;
    --r-xl: 14px;
    --r-full: 9999px;

    /* ===== 阴影：更克制、更高级 ===== */
    --sh-1: 0 1px 2px rgba(11, 15, 26, .04), 0 1px 3px rgba(11, 15, 26, .02);
    --sh-2: 0 1px 3px rgba(11, 15, 26, .05), 0 8px 20px -8px rgba(11, 15, 26, .14);
    --sh-3: 0 4px 6px rgba(11, 15, 26, .03), 0 16px 40px -12px rgba(11, 15, 26, .18);
    --sh-4: 0 8px 16px rgba(11, 15, 26, .04), 0 28px 56px -20px rgba(11, 15, 26, .22);
    --sh-focus: 0 0 0 3px rgba(184, 146, 106, .22);
    --sh-gold: 0 0 24px rgba(184, 146, 106, .18);

    /* ===== 动效：更优雅 ===== */
    --ease-out: cubic-bezier(.22, 1, .36, 1);
    --ease-in-out: cubic-bezier(.65, 0, .35, 1);
    --ease-back: cubic-bezier(.34, 1.56, .64, 1);
    --ease-silk: cubic-bezier(.4, 0, .2, 1);
    --dur-1: 180ms;
    --dur-2: 320ms;
    --dur-3: 520ms;
    --dur-4: 800ms;
    --dur-5: 1200ms;

    /* ===== 字体 ===== */
    --font: "Manrope", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-serif: "Playfair Display", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
    --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Consolas, monospace;
}

/* ===== 全局 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background-color: var(--bg);
    background-image: radial-gradient(circle at 1px 1px, rgba(11, 15, 26, .03) 1px, transparent 0);
    background-size: 24px 24px;
    color: var(--ink-900);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

/* 页面加载淡入 */
@keyframes pageIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
body { animation: pageIn .6s var(--ease-out) both; }

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; }
button { cursor: pointer; }
::selection { background: var(--gold); color: #fff; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 var(--sp-400, 32px); }

/* ===== 文本样式：增加衬线体标题 ===== */
.title-1 { font-size: 20px; line-height: 28px; font-weight: 600; letter-spacing: -.01em; }
.title-2 {
    font-family: var(--font-serif);
    font-size: 28px; line-height: 36px; font-weight: 700; letter-spacing: -.02em;
}
.title-3 { font-size: 16px; line-height: 24px; font-weight: 600; }
.title-4 { font-size: 14px; line-height: 20px; font-weight: 500; }

/* 艺术大标题 */
.display {
    font-family: var(--font-serif);
    font-size: 56px; line-height: 64px; font-weight: 700;
    letter-spacing: -.03em; text-wrap: balance;
}
.display-sub {
    font-size: 18px; line-height: 30px; font-weight: 400;
    color: var(--ink-500); max-width: 520px;
}

.body-3 { font-size: 16px; line-height: 26px; font-weight: 400; color: var(--ink-500); }
.body-4 { font-size: 14px; line-height: 22px; font-weight: 600; color: var(--ink-700); }
.caption-2 { font-size: 14px; line-height: 20px; font-weight: 400; color: var(--ink-500); }
.caption-3 { font-size: 12px; line-height: 16px; font-weight: 600; color: var(--ink-500); letter-spacing: .04em; text-transform: uppercase; }
.caption-4 { font-size: 12px; line-height: 16px; font-weight: 500; color: var(--ink-500); }
.caption-5 { font-size: 12px; line-height: 16px; font-weight: 400; color: var(--ink-400); }

h1, h2, h3, h4 { text-wrap: balance; }
p { text-wrap: pretty; }
.num { font-variant-numeric: tabular-nums; }

.link {
    color: var(--brand);
    font-weight: 500;
    position: relative;
    transition: color var(--dur-1) var(--ease-out);
}
.link::after {
    content: "";
    position: absolute; left: 0; bottom: -1px;
    width: 100%; height: 1px;
    background: currentColor;
    transform: scaleX(0); transform-origin: right center;
    transition: transform var(--dur-2) var(--ease-out);
}
.link:hover { color: var(--brand-600); }
.link:hover::after { transform: scaleX(1); transform-origin: left center; }

.skip-link {
    position: absolute; left: -9999px; top: 0; z-index: 300;
    background: var(--ink-900); color: #fff; padding: 10px 16px; border-radius: var(--r-sm);
}
.skip-link:focus { left: 16px; top: 16px; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; border-radius: var(--r-xs); }

/* ===== 图标 ===== */
.icon { width: 18px; height: 18px; flex: none; stroke-width: 1.7; }
.icon-sm { width: 15px; height: 15px; }
.icon-lg { width: 22px; height: 22px; }
.icon-box {
    display: inline-flex; align-items: center; justify-content: center;
    width: 40px; height: 40px; border-radius: var(--r-md);
    background: var(--gold-50); color: var(--gold-600);
    border: 1px solid var(--line);
    transition: transform var(--dur-2) var(--ease-back), box-shadow var(--dur-2) var(--ease-out);
}
.icon-box-dark { background: rgba(255, 255, 255, .08); color: #fff; border-color: rgba(255, 255, 255, .14); }

/* ===== 按钮：艺术质感 ===== */
.btn {
    position: relative; overflow: hidden; isolation: isolate;
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    border: 1px solid transparent; border-radius: var(--r-md);
    font-weight: 600; white-space: nowrap; cursor: pointer;
    transition: background-color var(--dur-2) var(--ease-out),
                border-color var(--dur-2) var(--ease-out),
                color var(--dur-2) var(--ease-out),
                box-shadow var(--dur-2) var(--ease-out),
                transform var(--dur-1) var(--ease-out);
}
.btn::before {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,.12) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--dur-2) var(--ease-out);
    pointer-events: none;
}
.btn:hover::before { opacity: 1; }
.btn:active { transform: scale(.97); transition-duration: 80ms; }
.btn-md { font-size: 15px; line-height: 22px; padding: 10px 18px; }
.btn-sm { font-size: 13.5px; line-height: 20px; padding: 7px 14px; }
.btn-lg { font-size: 16px; line-height: 24px; padding: 13px 26px; }
.btn-block { width: 100%; }

.btn-primary {
    background: var(--ink-900); color: #fff;
    box-shadow: var(--sh-2), inset 0 1px 0 rgba(255,255,255,.08);
}
.btn-primary:hover { background: var(--ink-700); box-shadow: var(--sh-3); }

.btn-brand {
    background: var(--brand); color: #fff;
    box-shadow: var(--sh-2), inset 0 1px 0 rgba(255,255,255,.08);
}
.btn-brand:hover { background: var(--brand-600); box-shadow: var(--sh-3); }

.btn-gold {
    background: var(--gold); color: #fff;
    box-shadow: var(--sh-2), inset 0 1px 0 rgba(255,255,255,.15);
}
.btn-gold:hover { background: var(--gold-600); box-shadow: var(--sh-3), var(--sh-gold); }

.btn-ghost {
    background: var(--bg); color: var(--ink-800);
    border-color: var(--line-strong);
}
.btn-ghost:hover { border-color: var(--gold-600); background: var(--gold-50); color: var(--ink-900); }

.btn-quiet { background: transparent; color: var(--ink-600); }
.btn-quiet:hover { background: var(--bg-alt); color: var(--ink-900); }

.btn-danger-ghost { background: var(--bg); color: var(--danger); border-color: var(--line-strong); }
.btn-danger-ghost:hover { background: var(--danger-bg); border-color: var(--danger); }

/* 按压冲击波 */
.btn__impact {
    position: absolute; left: 0; top: 0; width: 48px; height: 48px; border-radius: 50%;
    background: rgba(255, 255, 255, .35); transform: translate(-50%, -50%) scale(.2);
    pointer-events: none; z-index: -1; animation: impact 640ms var(--ease-out) forwards;
}
.btn-ghost .btn__impact, .btn-quiet .btn__impact { background: rgba(11, 15, 26, .14); }
@keyframes impact {
    from { transform: translate(-50%, -50%) scale(.2); opacity: .55; }
    to { transform: translate(-50%, -50%) scale(2.4); opacity: 0; }
}

/* ===== 顶部滚动进度 ===== */
.scroll-progress {
    position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 120;
    background: var(--gold);
    transform: scaleX(0); transform-origin: left center;
}

/* ===== 导航 ===== */
.nav-wrap {
    position: sticky; top: 0; z-index: 110;
    background: rgba(250, 250, 248, .92);
    backdrop-filter: saturate(180%) blur(16px);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    border-bottom: 1px solid var(--line);
}
.nav {
    display: flex; align-items: center; gap: var(--sp-500, 40px);
    height: 64px; max-width: 1160px; margin: 0 auto; padding: 0 32px;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; letter-spacing: -.01em; }
.nav-brand-mark {
    display: inline-flex; align-items: center; justify-content: center;
    width: 30px; height: 30px; border-radius: var(--r-sm);
    background: var(--ink-900); color: #fff; font-size: 14px; font-weight: 700;
    transition: transform var(--dur-2) var(--ease-back), box-shadow var(--dur-2) var(--ease-out);
}
.nav-brand:hover .nav-brand-mark { transform: rotate(-8deg) scale(1.08); box-shadow: var(--sh-gold); }
.nav-menu { display: flex; align-items: center; gap: 32px; flex: 1; }
.nav-links { display: flex; gap: 4px; }
.nav-link {
    position: relative; display: inline-flex; align-items: center; gap: 7px;
    padding: 8px 12px; border-radius: var(--r-sm);
    font-size: 14px; line-height: 20px; font-weight: 500; color: var(--ink-500);
    transition: color var(--dur-1) var(--ease-out), background-color var(--dur-1) var(--ease-out);
}
.nav-link::after {
    content: ""; position: absolute; left: 12px; right: 12px; bottom: 2px; height: 1.5px;
    background: var(--gold); transform: scaleX(0); transform-origin: left center;
    transition: transform var(--dur-2) var(--ease-out);
}
.nav-link:hover { color: var(--ink-900); background: var(--bg-alt); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link.is-active { color: var(--ink-900); font-weight: 600; }
.nav-link.is-active::after { transform: scaleX(1); }
.nav-actions { display: flex; gap: 8px; }

.nav-toggle {
    display: none; width: 40px; height: 40px; border: 1px solid var(--line);
    background: var(--bg); border-radius: var(--r-sm); position: relative; margin-left: auto;
}
.nav-toggle-line {
    position: absolute; left: 11px; right: 11px; height: 1.8px; border-radius: 2px;
    background: var(--ink-900); transition: transform var(--dur-3) var(--ease-out), top var(--dur-3) var(--ease-out);
}
.nav-toggle-line:nth-child(1) { top: 16px; }
.nav-toggle-line:nth-child(2) { top: 23px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) { top: 20px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) { top: 20px; transform: rotate(-45deg); }

/* ===== Hero ===== */
.hero { padding: 96px 0 80px; position: relative; overflow: hidden; }
.hero::before {
    content: "";
    position: absolute; top: -40%; right: -20%;
    width: 800px; height: 800px; border-radius: 50%;
    background: radial-gradient(circle, rgba(184,146,106,.06) 0%, transparent 70%);
    pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr); gap: 56px; align-items: center; }

.hero-eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 14px; margin-bottom: 24px;
    border: 1px solid var(--line); border-left: 2px solid var(--gold);
    border-radius: var(--r-sm); background: var(--gold-50);
    font-size: 13px; color: var(--gold-600); font-weight: 500;
    animation: fadeSlideUp .8s var(--ease-out) both;
}
.hero-eyebrow .dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--ok); box-shadow: 0 0 0 3px rgba(45, 106, 79, .16);
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: .7; }
}

.hero-title {
    max-width: 680px; margin-bottom: 20px;
    font-family: var(--font-serif);
    font-size: 52px; line-height: 60px; font-weight: 700; letter-spacing: -.028em;
    color: var(--ink-900);
    animation: fadeSlideUp .8s .1s var(--ease-out) both;
}
.hero-title .accent {
    color: var(--gold-600);
    position: relative;
}
.hero-title .accent::after {
    content: "";
    position: absolute; left: 0; bottom: 2px;
    width: 100%; height: 8px;
    background: linear-gradient(90deg, var(--gold-100), transparent);
    z-index: -1; opacity: .8;
}
.hero-sub { max-width: 560px; margin-bottom: 32px; font-size: 17px; line-height: 30px; color: var(--ink-500); animation: fadeSlideUp .8s .2s var(--ease-out) both; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; animation: fadeSlideUp .8s .3s var(--ease-out) both; }
.hero-proof { margin-top: 24px; display: flex; align-items: center; gap: 8px; animation: fadeSlideUp .8s .4s var(--ease-out) both; }
.hero-proof .icon { color: var(--ok); }

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: none; }
}

.page-head { padding: 72px 0 40px; max-width: 760px; }
.page-head .hero-title { font-size: 40px; line-height: 48px; letter-spacing: -.02em; }
.page-head .hero-sub { margin-bottom: 0; max-width: 640px; }

/* 产品界面预览 */
.mock {
    border: 1px solid var(--line); border-radius: var(--r-xl); background: var(--bg);
    box-shadow: var(--sh-4); overflow: hidden;
    transform: perspective(1400px) rotateY(-6deg) rotateX(2deg);
    transition: transform var(--dur-4) var(--ease-out), box-shadow var(--dur-4) var(--ease-out);
}
.mock:hover { transform: perspective(1400px) rotateY(-2deg) rotateX(1deg) translateY(-6px); box-shadow: var(--sh-4), 0 32px 64px -16px rgba(184,146,106,.1); }
.mock-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--line); background: var(--bg-alt); }
.mock-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--line-strong); }
.mock-url {
    margin-left: 8px; font-family: var(--mono); font-size: 11px; color: var(--ink-400);
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-xs); padding: 3px 8px;
}
.mock-body { display: grid; grid-template-columns: 132px 1fr; min-height: 292px; }
.mock-side { border-right: 1px solid var(--line); padding: 14px 10px; background: var(--bg-alt); }
.mock-side-item {
    display: flex; align-items: center; gap: 8px; padding: 7px 9px; border-radius: var(--r-sm);
    font-size: 12px; color: var(--ink-500); margin-bottom: 3px;
}
.mock-side-item.is-on { background: var(--ink-900); color: #fff; }
.mock-side-item .bar { width: 12px; height: 4px; border-radius: 2px; background: currentColor; opacity: .55; }
.mock-main { padding: 16px; }
.mock-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.mock-title { font-size: 13px; font-weight: 700; }
.mock-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 12px; }
.mock-kpi { border: 1px solid var(--line); border-radius: var(--r-md); padding: 10px; }
.mock-kpi-label { font-size: 10.5px; color: var(--ink-400); margin-bottom: 4px; }
.mock-kpi-num { font-size: 18px; font-weight: 700; letter-spacing: -.02em; }
.mock-kpi-delta { font-size: 10.5px; font-weight: 600; color: var(--ok); }
.mock-chart { border: 1px solid var(--line); border-radius: var(--r-md); padding: 10px 10px 6px; background: var(--bg); }
.mock-chart svg { width: 100%; height: 92px; }
.mock-rows { display: grid; gap: 6px; margin-top: 12px; }
.mock-row { display: grid; grid-template-columns: 1.4fr 1fr .7fr; gap: 8px; align-items: center; }
.mock-cell { height: 7px; border-radius: 2px; background: var(--bg-sunken); }
.mock-cell.dark { background: var(--ink-700); }
.mock-chip { font-size: 10px; font-weight: 600; padding: 2px 6px; border-radius: var(--r-xs); background: var(--ok-bg); color: var(--ok); justify-self: start; }

/* ===== Mock：真实企业通讯界面 ===== */
.mock-chat { grid-template-columns: 180px 1fr; min-height: 340px; }
.mock-chat-side { border-right: 1px solid var(--line); padding: 12px; background: var(--bg-alt); display: flex; flex-direction: column; gap: 6px; }
.mock-chat-search {
    display: flex; align-items: center; gap: 6px;
    padding: 6px 9px; border-radius: var(--r-sm);
    background: var(--bg); color: var(--ink-400); font-size: 12px;
    border: 1px solid var(--line); margin-bottom: 4px;
}
.mock-chat-search .icon { color: var(--ink-300); }
.mock-convo {
    display: flex; align-items: flex-start; gap: 8px;
    padding: 8px; border-radius: var(--r-sm);
    transition: background-color var(--dur-1) var(--ease-out);
}
.mock-convo:hover { background: var(--bg-sunken); }
.mock-convo.is-active { background: var(--brand-50); border: 1px solid rgba(26, 58, 92, .12); }
.mock-convo-avatar {
    display: inline-flex; align-items: center; justify-content: center;
    width: 28px; height: 28px; border-radius: var(--r-sm);
    background: var(--gold-50); color: var(--gold-600);
    font-size: 12px; font-weight: 700; flex: none;
}
.mock-convo-main { flex: 1; min-width: 0; }
.mock-convo-head { display: flex; justify-content: space-between; align-items: center; gap: 4px; }
.mock-convo-name { font-size: 12px; font-weight: 600; color: var(--ink-800); }
.mock-convo-time { font-size: 10px; color: var(--ink-400); flex: none; }
.mock-convo-snippet { font-size: 11px; color: var(--ink-500); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mock-convo-badge { color: var(--brand); font-weight: 500; }

.mock-chat-main { display: flex; flex-direction: column; min-height: 0; background: var(--bg); }
.mock-chat-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--bg);
}
.mock-chat-title { font-size: 13px; font-weight: 700; color: var(--ink-900); }
.mock-chat-subtitle { font-size: 11px; color: var(--ink-400); margin-top: 1px; }
.mock-chat-tools { display: flex; gap: 8px; }
.mock-chat-tool { width: 14px; height: 14px; border-radius: 50%; background: var(--ink-300); opacity: .5; }

.mock-chat-messages { flex: 1; padding: 14px 16px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; }
.mock-chat-date { text-align: center; font-size: 10px; color: var(--ink-400); margin: 4px 0; }
.mock-msg { display: flex; gap: 10px; align-items: flex-start; }
.mock-msg-avatar {
    display: inline-flex; align-items: center; justify-content: center;
    width: 30px; height: 30px; border-radius: var(--r-sm);
    background: var(--gold-50); color: var(--gold-600);
    font-size: 13px; font-weight: 700; flex: none;
}
.mock-msg-body { flex: 1; min-width: 0; }
.mock-msg-meta { display: flex; align-items: center; gap: 6px; margin-bottom: 5px; }
.mock-tag {
    font-size: 9px; font-weight: 700; padding: 1px 5px; border-radius: var(--r-xs);
}
.mock-tag-primary { background: var(--brand-50); color: var(--brand); }
.mock-tag-warn { background: var(--warn-bg); color: var(--warn); }
.mock-msg-id { font-size: 10px; color: var(--ink-400); margin-left: auto; }
.mock-notice-card {
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-md);
    padding: 10px 12px; max-width: 280px;
    box-shadow: var(--sh-1);
}
.mock-notice-title { font-size: 12px; font-weight: 700; color: var(--ink-900); margin-bottom: 5px; }
.mock-notice-text { font-size: 11px; line-height: 1.6; color: var(--ink-500); margin-bottom: 6px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.mock-notice-link { font-size: 10px; color: var(--brand); font-weight: 500; }

.mock-chat-input {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 14px; border-top: 1px solid var(--line); background: var(--bg);
}
.mock-input-box {
    flex: 1; display: flex; align-items: center; gap: 8px;
    padding: 7px 10px; border-radius: var(--r-sm);
    background: var(--bg-alt); border: 1px solid var(--line);
    color: var(--ink-400); font-size: 11px;
}
.mock-input-box .icon { color: var(--ink-400); }
.mock-input-placeholder { color: var(--ink-400); margin-left: 4px; }
.mock-send-btn {
    padding: 6px 14px; border-radius: var(--r-sm);
    background: var(--brand); color: #fff; border: none;
    font-size: 12px; font-weight: 600; cursor: pointer;
    box-shadow: var(--sh-1);
}

@media (max-width: 760px) {
    .mock-chat { grid-template-columns: 1fr; }
    .mock-chat-side { display: none; }
    .mock-notice-card { max-width: none; }
}

/* ===== 版块 ===== */
.section { padding: 96px 0; position: relative; }
.section-alt {
    background: var(--bg-alt);
    border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft);
}
.section-eyebrow {
    margin-bottom: 12px; color: var(--gold-600);
    font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
}
.section-title {
    max-width: 680px; margin-bottom: 48px;
    font-family: var(--font-serif);
    font-size: 36px; line-height: 44px; font-weight: 700; letter-spacing: -.022em;
}
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; margin-bottom: 40px; }
.section-head .section-title { margin-bottom: 0; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* 艺术卡片 */
.card {
    position: relative; background: var(--bg); border: 1px solid var(--line);
    border-radius: var(--r-lg); padding: 28px;
    transition: border-color var(--dur-2) var(--ease-out), box-shadow var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
}
.card::before {
    content: "";
    position: absolute; inset: 0; border-radius: inherit;
    background: linear-gradient(135deg, rgba(184,146,106,.03) 0%, transparent 50%);
    opacity: 0; transition: opacity var(--dur-3) var(--ease-out);
    pointer-events: none;
}
.card:hover { border-color: var(--line-strong); box-shadow: var(--sh-3); transform: translateY(-4px); }
.card:hover::before { opacity: 1; }

/* 指针跟随高光 */
.spotlight::after {
    content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
    background: radial-gradient(260px circle at var(--mx, 50%) var(--my, 0%), rgba(184, 146, 106, .08), transparent 70%);
    opacity: 0; transition: opacity var(--dur-2) var(--ease-out);
}
.spotlight:hover::after { opacity: 1; }

.stat-strip {
    display: grid; grid-template-columns: repeat(4, 1fr);
    border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--bg);
    box-shadow: var(--sh-1); overflow: hidden; margin-bottom: 24px;
}
.stat { padding: 26px 24px; border-right: 1px solid var(--line-soft); position: relative; }
.stat:last-child { border-right: none; }
.stat::before {
    content: "";
    position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--gold), transparent);
    opacity: 0; transition: opacity var(--dur-2) var(--ease-out);
}
.stat:hover::before { opacity: 1; }
.stat-num { font-size: 30px; line-height: 36px; font-weight: 700; letter-spacing: -.02em; margin-bottom: 4px; }

.feature-item {
    position: relative; background: var(--bg); border: 1px solid var(--line);
    border-radius: var(--r-lg); padding: 28px;
    transition: border-color var(--dur-2) var(--ease-out), box-shadow var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
}
.feature-item:hover { border-color: var(--line-strong); box-shadow: var(--sh-3); transform: translateY(-4px); }
.feature-item:hover .icon-box { transform: scale(1.1) rotate(-4deg); box-shadow: var(--sh-gold); }
.feature-item h3 { margin-bottom: 8px; }
.feature-item .icon-box { margin-bottom: 18px; }

/* 标语逐字点亮 */
.tagline-section { padding: 110px 0; text-align: center; position: relative; }
.tagline-section::before {
    content: "";
    position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
    width: 600px; height: 200px;
    background: radial-gradient(ellipse, rgba(184,146,106,.04) 0%, transparent 70%);
    pointer-events: none;
}
.tagline {
    max-width: 760px; margin: 0 auto;
    font-family: var(--font-serif);
    font-size: 40px; line-height: 56px; font-weight: 700; letter-spacing: -.02em;
}
.tagline .tag-word { color: rgba(11, 15, 26, .22); transition: color var(--dur-3) var(--ease-out); }
.tagline .tag-word.is-lit { color: var(--ink-900); }
.tagline .tag-word.is-lit.accent { color: var(--gold-600); }

.promo-body { max-width: 720px; }
.promo-body p { margin-bottom: 16px; }
.features-body {
    position: relative;
    padding-left: 28px;
    border-left: 1px solid var(--line);
}
.features-body::before {
    content: "";
    position: absolute; left: -1px; top: 0;
    width: 2px; height: 80px;
    background: linear-gradient(180deg, var(--gold), transparent);
}
.features-body h4 { margin: 40px 0 8px; font-family: var(--font-serif); font-size: 24px; line-height: 32px; font-weight: 700; }
.features-body h4:first-child { margin-top: 0; }
.features-body ul { margin-bottom: 16px; }
.features-body li { position: relative; padding-left: 20px; margin-bottom: 8px; color: var(--ink-500); }
.features-body li::before {
    content: ""; position: absolute; left: 2px; top: 10px; width: 6px; height: 6px;
    border-radius: 1px; background: var(--gold); transform: rotate(45deg);
}
.features-body p { margin-bottom: 16px; color: var(--ink-600); }

.legal-body { max-width: 760px; }
.legal-body p { margin-bottom: 18px; color: var(--ink-600); }
.legal-body p:first-child::first-letter {
    float: left; font-family: var(--font-serif); font-size: 56px; line-height: 1;
    padding-right: 12px; color: var(--gold-600); font-weight: 700;
}

.faq-wrap { max-width: 780px; margin: 0 auto; }
.faq-wrap .section-title { margin: 0 auto 40px; text-align: center; }
.faq-list { display: grid; gap: 8px; }
.faq {
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-md);
    overflow: hidden;
    transition: border-color var(--dur-2) var(--ease-out), box-shadow var(--dur-2) var(--ease-out);
}
.faq[open] { border-color: var(--line-strong); box-shadow: var(--sh-2); }
.faq summary {
    list-style: none; cursor: pointer; padding: 18px 22px;
    display: flex; justify-content: space-between; align-items: center; gap: 16px;
    font-size: 15.5px; font-weight: 600; color: var(--ink-800);
    transition: background-color var(--dur-1) var(--ease-out);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
    content: ""; width: 8px; height: 8px; flex: none;
    border-right: 1.6px solid var(--ink-400); border-bottom: 1.6px solid var(--ink-400);
    transform: rotate(45deg); transition: transform var(--dur-3) var(--ease-back);
}
.faq[open] summary::after { transform: rotate(225deg); }
.faq summary:hover { background: var(--bg-alt); }
.body-faq { padding: 0 22px 20px; font-size: 15px; }

.cta-final { text-align: center; padding-bottom: 96px; }
.cta-final .section-title { margin-left: auto; margin-right: auto; }

.cta-inline {
    display: flex; justify-content: space-between; align-items: center; gap: 32px; flex-wrap: wrap;
    background: var(--bg-deep); color: #fff; border-radius: var(--r-xl); padding: 44px 48px;
    position: relative; overflow: hidden;
}
.cta-inline::before {
    content: "";
    position: absolute; top: -50%; right: -20%;
    width: 500px; height: 500px; border-radius: 50%;
    background: radial-gradient(circle, rgba(184,146,106,.12) 0%, transparent 60%);
    pointer-events: none;
}
.cta-inline::after {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(600px circle at 88% 120%, rgba(26, 58, 92, .45), transparent 65%);
    pointer-events: none;
}
.cta-inline > * { position: relative; z-index: 1; }
.cta-inline .title-2 { color: #fff; font-family: var(--font-serif); }
.cta-inline .caption-2 { color: rgba(255, 255, 255, .58); }

/* ===== 数据条 / 指标 ===== */
.kpi-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.kpi {
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 22px;
    transition: box-shadow var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
}
.kpi:hover { box-shadow: var(--sh-2); transform: translateY(-2px); }
.kpi-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.kpi-label { font-size: 13px; color: var(--ink-500); }
.kpi-value { font-size: 30px; line-height: 36px; font-weight: 700; letter-spacing: -.02em; }
.kpi-delta { font-size: 12px; font-weight: 600; color: var(--ok); }

/* ===== 下载页 ===== */
.login-gate { text-align: center; max-width: 560px; margin: 0 auto 32px; }
.login-gate-actions { display: flex; gap: 10px; justify-content: center; margin-top: 22px; flex-wrap: wrap; }

.dl-list { display: grid; gap: 12px; }
.dl-item { display: flex; justify-content: space-between; align-items: center; gap: 28px; padding: 24px 26px; }
.dl-latest { border-color: var(--ink-900); box-shadow: var(--sh-2); }
.dl-title-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.dl-meta { margin-top: 2px; }
.dl-action { text-align: right; flex: none; }
.dl-count { margin-top: 6px; }

.badge {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 3px 8px; border-radius: var(--r-xs);
    background: var(--ink-900); color: #fff; font-size: 11.5px; line-height: 16px; font-weight: 600;
}
.chip {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 3px 9px; border-radius: var(--r-xs); border: 1px solid var(--line);
    font-size: 12px; font-weight: 600; color: var(--ink-600); background: var(--bg-alt);
}
.chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); }
.chip-ok { background: var(--ok-bg); color: var(--ok); border-color: rgba(45, 106, 79, .18); }
.chip-warn { background: var(--warn-bg); color: var(--warn); border-color: rgba(180, 83, 9, .18); }

/* ===== 开发团队 ===== */
.team-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
.team-card h2 { margin-top: 18px; font-family: var(--font-serif); }
.team-avatar {
    display: inline-flex; align-items: center; justify-content: center;
    width: 52px; height: 52px; border-radius: var(--r-md);
    background: var(--ink-900); color: #fff; font-size: 20px; font-weight: 700;
    transition: transform var(--dur-2) var(--ease-back), box-shadow var(--dur-2) var(--ease-out);
}
.team-card:hover .team-avatar { transform: scale(1.08) rotate(-3deg); box-shadow: var(--sh-gold); }
.team-role { color: var(--gold-600); margin: 6px 0 10px; font-weight: 500; }
.team-bio { font-size: 14px; }

.empty { text-align: center; max-width: 540px; margin: 0 auto; }
.empty-inline h3 { margin-bottom: 6px; }

/* ===== 表单：艺术质感 ===== */
.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 72px 32px; }
body.admin-login {
    background: var(--bg-deep);
}
body.admin-login .auth-card {
    border-color: rgba(255,255,255,.1);
    background: rgba(255,255,255,.97);
    box-shadow: 0 24px 80px -20px rgba(0,0,0,.4), 0 0 0 1px rgba(255,255,255,.08) inset;
}
body.admin-login .auth-eyebrow { color: var(--gold-600); }
.auth-page::before {
    content: "";
    position: fixed; inset: 0;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(184,146,106,.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(26,58,92,.03) 0%, transparent 50%);
    pointer-events: none; z-index: -1;
}
.auth-card { width: min(100%, 448px); padding: 34px; box-shadow: var(--sh-3); }
.auth-eyebrow { color: var(--gold-600); margin-bottom: 8px; font-weight: 600; }
.auth-sub { margin: 6px 0 26px; }
.auth-alt { margin-top: 24px; text-align: center; }

.field { margin-bottom: 22px; transition: transform var(--dur-2) var(--ease-out); }
.field.is-focused { transform: translateX(2px); }
.field.is-focused .label { color: var(--gold-600); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field-row-3 { grid-template-columns: 1fr 1fr 1fr; }
.label { display: block; margin-bottom: 7px; color: var(--ink-700); font-weight: 500; }
.input {
    width: 100%; padding: 11px 14px;
    border: 1px solid var(--line-strong); border-radius: var(--r-md);
    background: var(--bg); color: var(--ink-900);
    font-size: 15px; line-height: 22px;
    transition: border-color var(--dur-1) var(--ease-out), box-shadow var(--dur-1) var(--ease-out), background-color var(--dur-1) var(--ease-out);
}
.input::placeholder { color: var(--ink-300); }
.input:hover { border-color: var(--ink-400); }
.input:focus {
    outline: none;
    border-color: var(--gold-600);
    box-shadow: var(--sh-focus);
    background: #fff;
}
.textarea { resize: vertical; min-height: 96px; font-size: 14px; line-height: 22px; }
.input-file { padding: 9px 12px; }
.field-error { color: var(--danger); margin-top: 6px; font-size: 13px; }
.field-hint { margin-top: 6px; }
.field-check { margin-top: -8px; }
.check-label { display: inline-flex; align-items: center; gap: 9px; cursor: pointer; }
.check-label input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--gold-600); cursor: pointer; }

.form-error {
    border: 1px solid rgba(155, 44, 44, .18); background: var(--danger-bg); border-radius: var(--r-md);
    padding: 16px; margin-bottom: 24px;
}
.form-error ul { list-style: disc; padding-left: 18px; }
.form-error .caption-2, .form-error .caption-3 { color: var(--danger); }
.form-notice {
    border: 1px solid var(--line); background: var(--gold-50); border-radius: var(--r-md);
    padding: 16px; margin-bottom: 24px;
}

/* ===== 个人中心 ===== */
.dash-grid { align-items: start; }
.dash-card h2 { margin-bottom: 22px; font-family: var(--font-serif); }
.info-list { display: grid; border-top: 1px solid var(--line-soft); }
.info-row { display: flex; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line-soft); }
.dash-out { margin-top: 24px; }
.dash-version { font-size: 20px; line-height: 28px; font-weight: 600; margin-bottom: 4px; }
.version-num { color: var(--gold-600); font-family: var(--font-serif); }
.dash-card .login-gate-actions { justify-content: flex-start; margin-top: 24px; }
.avatar-lg {
    display: inline-flex; align-items: center; justify-content: center;
    width: 62px; height: 62px; border-radius: var(--r-md);
    background: var(--ink-900); color: #fff; font-size: 24px; font-weight: 700;
    transition: transform var(--dur-2) var(--ease-back), box-shadow var(--dur-2) var(--ease-out);
}
.dash-card:hover .avatar-lg { transform: scale(1.06); box-shadow: var(--sh-gold); }

/* ===== 页脚 ===== */
.footer { border-top: 1px solid var(--line); background: var(--bg-alt); padding: 56px 0 28px; }
.footer-inner { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; margin-bottom: 40px; }
.footer-brand { display: flex; gap: 12px; align-items: center; }
.footer-name { font-weight: 700; font-size: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 14px; color: var(--ink-500); transition: color var(--dur-1) var(--ease-out); }
.footer-links a:hover { color: var(--ink-900); }
.footer-copy { border-top: 1px solid var(--line); padding-top: 24px; }

/* ===== 管理后台：深色质感 ===== */
.admin-body { background: var(--bg-alt); }
.admin-shell { display: flex; min-height: 100vh; }
.admin-side {
    width: 240px; flex: none; background: var(--bg-deep); color: #fff;
    display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh;
    padding: 22px 14px; overflow-y: auto;
}
.admin-side::before {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(184,146,106,.03) 0%, transparent 40%);
    pointer-events: none;
}
.admin-side-brand { display: flex; align-items: center; gap: 10px; padding: 0 10px 22px; font-weight: 700; position: relative; }
.admin-side-brand .nav-brand-mark { background: var(--gold); color: var(--ink-900); transition: transform var(--dur-2) var(--ease-back); }
.admin-side-brand:hover .nav-brand-mark { transform: rotate(-8deg) scale(1.1); }
.admin-side-name { font-size: 15px; }
.admin-nav { display: grid; gap: 2px; position: relative; }
.admin-nav-link {
    position: relative; overflow: hidden; display: flex; align-items: center; gap: 10px;
    padding: 10px 12px; border-radius: var(--r-sm);
    font-size: 14px; line-height: 20px; font-weight: 500; color: rgba(255, 255, 255, .58);
    transition: color var(--dur-1) var(--ease-out), background-color var(--dur-2) var(--ease-out), transform var(--dur-1) var(--ease-out);
}
.admin-nav-link .icon { color: rgba(255, 255, 255, .42); transition: color var(--dur-2) var(--ease-out); }
.admin-nav-link:hover { color: #fff; background: rgba(255, 255, 255, .06); }
.admin-nav-link:hover .icon { color: rgba(255, 255, 255, .8); }
.admin-nav-link:active { transform: scale(.98); }
.admin-nav-link.is-active { color: #fff; background: rgba(255, 255, 255, .1); font-weight: 600; }
.admin-nav-link.is-active .icon { color: var(--gold); }
.admin-nav-link.is-active::before {
    content: ""; position: absolute; left: -14px; top: 50%; transform: translateY(-50%);
    width: 3px; height: 20px; border-radius: 0 2px 2px 0; background: var(--gold);
    animation: navSlide var(--dur-3) var(--ease-back);
}
@keyframes navSlide { from { transform: translateY(-50%) scaleY(0); } to { transform: translateY(-50%) scaleY(1); } }
.admin-side-foot { margin-top: auto; border-top: 1px solid rgba(255, 255, 255, .1); padding: 18px 10px 0; display: grid; gap: 8px; }
.admin-side-foot .caption-4 { color: rgba(255, 255, 255, .5); }
.admin-exit { transition: color var(--dur-1) var(--ease-out); }
.admin-exit:hover { color: #fff; }

.admin-main { flex: 1; padding: 36px 40px; max-width: 1120px; }
.admin-head { margin-bottom: 26px; }
.admin-head .caption-2 { margin-top: 6px; }

.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 20px; }
.stat-card { padding: 20px; }
.stat-card:hover { transform: none; box-shadow: var(--sh-2); }
.stat-card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.stat-card-num { font-size: 28px; line-height: 34px; font-weight: 700; letter-spacing: -.02em; margin-bottom: 2px; }

.admin-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.admin-cols-content { grid-template-columns: 290px 1fr; align-items: start; }
.admin-panel { padding: 26px; margin-bottom: 16px; }
.admin-panel:hover { transform: none; box-shadow: var(--sh-2); }
.admin-panel-wide:hover { transform: none; box-shadow: var(--sh-2); }
.admin-panel h2 { margin-bottom: 20px; font-family: var(--font-serif); }
.admin-panel-main { margin-bottom: 16px; }
.panel-note { margin: -8px 0 20px; }
.admin-panel-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 20px; }
.admin-actions { display: flex; gap: 10px; margin-top: 4px; }
.admin-section-nav .section-list { display: grid; gap: 4px; }
.section-link {
    display: block; padding: 12px 14px; border-radius: var(--r-sm);
    border: 1px solid transparent;
    transition: background-color var(--dur-1) var(--ease-out), border-color var(--dur-1) var(--ease-out), transform var(--dur-1) var(--ease-out);
}
.section-link:hover { background: var(--bg-alt); transform: translateX(2px); }
.section-link.is-active { background: var(--gold-50); border-color: rgba(184, 146, 106, .25); }
.section-link .title-4 { display: block; margin-bottom: 2px; }

.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th, .admin-table td { text-align: left; padding: 12px 12px; border-bottom: 1px solid var(--line-soft); font-size: 14px; line-height: 20px; vertical-align: top; }
.admin-table thead th {
    font-size: 11px; font-weight: 700; color: var(--ink-400); letter-spacing: .06em; text-transform: uppercase;
    border-bottom: 1.5px solid var(--line); white-space: nowrap;
}
.admin-table tbody tr {
    transition: background-color var(--dur-1) var(--ease-out);
}
.admin-table tbody tr:hover { background: var(--bg-alt); }
.admin-table .table-sub { display: block; margin-top: 2px; }
.admin-table .table-wide { max-width: 260px; }
.inline-form { display: inline; }

.flash {
    position: sticky; top: 14px; z-index: 60;
    display: flex; align-items: center; gap: 10px;
    border-radius: var(--r-md); padding: 14px 16px; margin-bottom: 20px; border: 1px solid;
    animation: flashIn var(--dur-4) var(--ease-back);
    backdrop-filter: blur(8px);
}
.flash .icon { animation: flashIcon 520ms var(--ease-back) both; }
@keyframes flashIcon {
    from { transform: scale(0); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.flash-ok { background: var(--ok-bg); border-color: rgba(45, 106, 79, .18); }
.flash-ok .caption-2 { color: var(--ok); }
.flash-error { background: var(--danger-bg); border-color: rgba(155, 44, 44, .18); }
.flash-error .caption-2 { color: var(--danger); }
.flash.is-leaving { animation: flashOut var(--dur-3) var(--ease-out) forwards; }
@keyframes flashIn { from { opacity: 0; transform: translateY(-10px) scale(.98); } to { opacity: 1; transform: none; } }
@keyframes flashOut { to { opacity: 0; transform: translateY(-8px); } }

.member-divider { border: none; border-top: 1px solid var(--line-soft); margin: 24px 0; }
.member-edit .member-actions { margin-top: 0; }
.member-delete { margin-top: 10px; }

/* ===== 滚动显现与错峰 ===== */
html.js .reveal { opacity: 0; transform: translateY(32px); transition: opacity var(--dur-4) var(--ease-out), transform var(--dur-4) var(--ease-out); }
html.js .reveal.is-visible { opacity: 1; transform: none; }

/* 错开进入 */
html.js [data-stagger] .reveal:nth-child(1) { transition-delay: 0ms; }
html.js [data-stagger] .reveal:nth-child(2) { transition-delay: 80ms; }
html.js [data-stagger] .reveal:nth-child(3) { transition-delay: 160ms; }
html.js [data-stagger] .reveal:nth-child(4) { transition-delay: 240ms; }
html.js [data-stagger] .reveal:nth-child(5) { transition-delay: 320ms; }
html.js [data-stagger] .reveal:nth-child(6) { transition-delay: 400ms; }

/* ===== 分割线装饰 ===== */
.divider-art {
    display: flex; align-items: center; gap: 16px;
    margin: 48px 0;
}
.divider-art::before, .divider-art::after {
    content: "";
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}
.divider-art span {
    width: 6px; height: 6px;
    background: var(--gold);
    transform: rotate(45deg);
    flex: none;
}

/* ===== 加载动画 ===== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-alt) 25%, var(--bg-sunken) 50%, var(--bg-alt) 75%);
    background-size: 200% 100%;
    animation: skeleton 1.5s ease-in-out infinite;
    border-radius: var(--r-sm);
}
@keyframes skeleton {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ===== 减弱动效 ===== */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    html.js .reveal { opacity: 1; transform: none; transition: none; }
    .tagline .tag-word { color: var(--ink-900); transition: none; }
    .btn, .card, .feature-item, .faq summary::after, .mock, .nav-brand-mark, .icon-box, .team-avatar, .avatar-lg { transition: none; }
    .btn:active { transform: none; }
    .scroll-progress { display: none; }
    body { animation: none; }
    .hero-eyebrow, .hero-title, .hero-sub, .hero-cta, .hero-proof { animation: none; }
    .skeleton { animation: none; background: var(--bg-alt); }
}

/* ===== 响应式 ===== */
@media (max-width: 1040px) {
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .mock { transform: none; }
    .stat-strip, .kpi-row, .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .stat:nth-child(2) { border-right: none; }
    .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line-soft); }
    .admin-cols, .admin-cols-content { grid-template-columns: 1fr; }
    .field-row-3 { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
    .container { padding: 0 20px; }
    .hero { padding: 56px 0 48px; }
    .hero-title { font-size: 34px; line-height: 42px; }
    .page-head .hero-title { font-size: 30px; line-height: 38px; }
    .section { padding: 64px 0; }
    .section-title { font-size: 26px; line-height: 34px; margin-bottom: 32px; }
    .tagline { font-size: 28px; line-height: 40px; }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .field-row { grid-template-columns: 1fr; }
    .dl-item { flex-direction: column; align-items: flex-start; }
    .dl-action { text-align: left; }
    .cta-inline { flex-direction: column; align-items: flex-start; padding: 32px 26px; }
    .stat-strip, .kpi-row, .stat-grid { grid-template-columns: 1fr; }
    .stat { border-right: none; border-bottom: 1px solid var(--line-soft); }
    .stat:last-child { border-bottom: none; }
    .mock-body { grid-template-columns: 1fr; }
    .mock-side { display: none; }

    .nav { height: 58px; padding: 0 20px; gap: 16px; }
    .nav-toggle { display: block; }
    .nav-menu {
        position: fixed; inset: 0; z-index: 105;
        flex-direction: column; align-items: stretch; gap: 24px;
        padding: 96px 24px 32px; background: var(--bg);
        opacity: 0; visibility: hidden; transform: translateY(14px);
        transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out), visibility 0s var(--dur-3);
    }
    .nav-menu.is-open { opacity: 1; visibility: visible; transform: none; transition-delay: 0s; }
    .nav-links { flex-direction: column; gap: 2px; }
    .nav-link { font-size: 19px; padding: 12px 0; border-radius: 0; }
    .nav-link::after { left: 0; right: auto; width: 26px; bottom: 6px; }
    .nav-actions { flex-direction: column; margin-top: auto; }
    .nav-actions .btn { width: 100%; }
    .nav-menu .nav-links > li, .nav-menu .nav-actions {
        opacity: 0; transform: translateY(20px);
        transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
    }
    .nav-menu.is-open .nav-links > li, .nav-menu.is-open .nav-actions { opacity: 1; transform: none; }
    .nav-menu.is-open .nav-links > li:nth-child(1) { transition-delay: 60ms; }
    .nav-menu.is-open .nav-links > li:nth-child(2) { transition-delay: 120ms; }
    .nav-menu.is-open .nav-links > li:nth-child(3) { transition-delay: 180ms; }
    .nav-menu.is-open .nav-links > li:nth-child(4) { transition-delay: 240ms; }
    .nav-menu.is-open .nav-actions { transition-delay: 300ms; }

    .admin-shell { flex-direction: column; }
    .admin-side { width: 100%; height: auto; position: static; flex-direction: row; align-items: center; gap: 16px; padding: 14px 18px; overflow: visible; }
    .admin-side-brand { padding: 0; }
    .admin-nav { display: flex; flex-wrap: wrap; flex: 1; }
    .admin-nav-link.is-active::before { display: none; }
    .admin-side-foot { margin: 0; border: none; padding: 0; display: flex; gap: 14px; }
    .admin-main { padding: 24px 18px; }
}