/* ==========================================================================
   paper-theme.css — 「赭石纸墨」子页面共享主题
   与首页 index.html 的设计体系保持一致：纸墨基调 + 赭石点缀，克制单色。
   子页面用法：<link rel="stylesheet" href="../css/paper-theme.css">
   ========================================================================== */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --paper: #f7f4ec;
    --paper-deep: #efe9db;
    --card: rgba(255,255,255,0.72);
    --card-solid: #fffdf7;
    --ink: #211d15;
    --ink-2: #5b5342;
    --ink-3: #968e7a;
    --line: rgba(33,29,21,0.12);
    --accent: #b4502a;
    --accent-deep: #8f3c1f;
    --accent-soft: rgba(180,80,42,0.09);
    --olive: #64773c;
    --olive-soft: rgba(100,119,60,0.10);
    --clay: #8a6d3b;
    --clay-soft: rgba(138,109,59,0.10);
    --slate: #50606e;
    --slate-soft: rgba(80,96,110,0.10);
    --radius: 14px;
    --radius-lg: 22px;
    --shadow-sm: 0 1px 2px rgba(33,29,21,0.05), 0 2px 8px rgba(33,29,21,0.04);
    --shadow-md: 0 4px 14px rgba(33,29,21,0.07), 0 12px 36px rgba(33,29,21,0.07);
    --shadow-lg: 0 8px 24px rgba(33,29,21,0.10), 0 24px 60px rgba(33,29,21,0.12);
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --font-serif: 'Noto Serif SC', 'Songti SC', serif;
    --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-disp: 'Space Grotesk', 'Noto Sans SC', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
}

html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--paper);
    color: var(--ink);
    line-height: 1.75;
    font-size: 16.5px;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* 背景：暖色低饱和光斑 + 纸面颗粒（与首页一致） */
body::before {
    content: '';
    position: fixed; inset: 0; z-index: -2; pointer-events: none;
    background:
        radial-gradient(50vw 36vw at 88% -6%, rgba(180,80,42,0.07), transparent 62%),
        radial-gradient(42vw 32vw at -8% 24%, rgba(100,119,60,0.07), transparent 60%),
        radial-gradient(46vw 38vw at 52% 108%, rgba(138,109,59,0.08), transparent 62%),
        linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
}
body::after {
    content: '';
    position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: 0.5;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}

::selection { background: rgba(180,80,42,0.16); color: var(--accent-deep); }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img, video { max-width: 100%; display: block; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.ic { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.ic-sm { width: 15px; height: 15px; }

/* 滚动渐入 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }

/* ===== Header（与首页一致） ===== */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(247,244,236,0.85);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    border-bottom: 1px solid var(--line);
    transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.site-header.scrolled { box-shadow: 0 4px 24px rgba(33,29,21,0.06); }
.site-header.hidden { transform: translateY(-100%); }
.navbar {
    max-width: 1080px; margin: 0 auto; padding: 0 2rem; height: 64px;
    display: flex; justify-content: space-between; align-items: center;
}
.logo a {
    font-family: var(--font-serif); font-size: 1.3rem; font-weight: 900; letter-spacing: 0.02em;
    display: flex; align-items: center; gap: 0.55rem;
}
.logo .seal {
    width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center;
    background: var(--ink); color: var(--paper);
    font-family: var(--font-disp); font-size: 0.8rem; font-weight: 700;
}
.nav-links { display: flex; gap: 0.15rem; align-items: center; }
.nav-links a {
    position: relative; padding: 0.5rem 0.9rem; border-radius: 8px;
    font-size: 0.88rem; font-weight: 500; min-height: 44px;
    color: var(--ink-2); transition: all 0.2s var(--ease);
    display: flex; align-items: center;
}
.nav-links a:hover { color: var(--ink); background: rgba(33,29,21,0.05); }
.nav-links a.active { color: var(--accent); background: var(--accent-soft); font-weight: 700; }
.mobile-btn {
    display: none; flex-direction: column; gap: 4px;
    background: none; border: none; cursor: pointer; padding: 10px; min-width: 44px; min-height: 44px;
}
.mobile-btn span { width: 20px; height: 2px; background: var(--ink); border-radius: 2px; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 2rem; }
.container-wide { max-width: 1360px; margin: 0 auto; padding: 0 2rem; }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.85rem 1.7rem; border-radius: 100px; min-height: 48px;
    font-size: 0.92rem; font-weight: 700; transition: all 0.25s var(--ease);
    border: none; cursor: pointer;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-3px); box-shadow: 0 10px 28px rgba(143,60,31,0.30); }
.btn-ghost { border: 1.5px solid var(--ink); color: var(--ink); background: transparent; }
.btn-ghost:hover { background: var(--ink); color: var(--paper); transform: translateY(-3px); }
.btn-sm { padding: 0.45rem 1.05rem; min-height: 38px; font-size: 0.8rem; }

/* ===== 纸面卡片 / 面板 ===== */
.panel {
    padding: 1.5rem 1.6rem; border-radius: var(--radius-lg);
    border: 1px solid var(--line); background: var(--card);
    box-shadow: var(--shadow-sm);
}
.paper-card {
    border-radius: var(--radius);
    border: 1px solid var(--line); background: var(--card-solid);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s var(--ease);
}
.paper-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(180,80,42,0.35); }

/* ===== 筛选 / 标签胶囊 ===== */
.filter-btn {
    padding: 0.42rem 1.05rem; border-radius: 100px; min-height: 38px;
    font-family: var(--font-sans); font-size: 0.82rem; font-weight: 500;
    border: 1px solid var(--line); background: var(--card);
    color: var(--ink-2); cursor: pointer; transition: all 0.25s var(--ease);
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent-deep); background: var(--accent-soft); }
.filter-btn.active { background: var(--ink); color: var(--paper); border-color: var(--ink); font-weight: 700; }

.chip {
    padding: 0.18rem 0.6rem; border-radius: 100px; font-size: 0.68rem; font-weight: 500;
    font-family: var(--font-disp); display: inline-flex; align-items: center;
}
.chip-rust  { background: var(--accent-soft); color: var(--accent-deep); }
.chip-olive { background: var(--olive-soft); color: var(--olive); }
.chip-clay  { background: var(--clay-soft); color: var(--clay); }
.chip-slate { background: var(--slate-soft); color: var(--slate); }
.chip-ink   { background: rgba(33,29,21,0.07); color: var(--ink); }

/* ===== 子页面页头 ===== */
.page-hero { padding: 8.5rem 0 1.2rem; position: relative; }
.page-eyebrow {
    display: inline-flex; align-items: center; gap: 0.55rem;
    padding: 0.42rem 1rem; border-radius: 100px;
    border: 1px solid var(--line); background: var(--card);
    font-family: var(--font-disp); font-size: 0.74rem; font-weight: 500;
    letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-2);
    box-shadow: var(--shadow-sm);
}
.page-eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.page-hero h1 {
    font-family: var(--font-serif); font-weight: 900;
    font-size: clamp(2.1rem, 4.5vw, 3.2rem);
    line-height: 1.18; letter-spacing: 0.01em; margin: 1.1rem 0 0;
}
.page-hero .page-lead { margin-top: 0.9rem; max-width: 640px; font-size: 0.98rem; color: var(--ink-2); line-height: 1.85; }

/* ===== 数据表 ===== */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); background: var(--card-solid); box-shadow: var(--shadow-sm); }
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }
.table-wrap thead th {
    font-family: var(--font-disp); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em;
    color: var(--ink-2); text-align: left; white-space: nowrap;
    padding: 0.8rem 1rem; border-bottom: 1px solid var(--line); background: var(--paper-deep);
}
.table-wrap tbody td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.table-wrap tbody tr:last-child td { border-bottom: none; }
.table-wrap tbody tr { transition: background 0.2s var(--ease); }
.table-wrap tbody tr:hover { background: var(--accent-soft); }

/* ===== Footer（与首页一致） ===== */
.site-footer { margin-top: 5rem; border-top: 1px solid var(--line); background: rgba(239,233,219,0.6); }
.footer-inner { max-width: 1080px; margin: 0 auto; padding: 3.5rem 2rem 2rem; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 3rem; }
.footer-col h3 { font-family: var(--font-serif); font-size: 1rem; font-weight: 900; margin-bottom: 0.85rem; }
.footer-col p, .footer-col li a { color: var(--ink-2); font-size: 0.86rem; line-height: 1.8; }
.footer-col ul li { margin-bottom: 0.4rem; }
.footer-col ul li a { transition: color 0.2s; display: inline-flex; align-items: center; gap: 0.4rem; }
.footer-col ul li a:hover { color: var(--accent); }
.footer-col ul li a .ic { width: 14px; height: 14px; color: var(--ink-3); }
.footer-gh {
    margin-top: 0.9rem; display: inline-flex; align-items: center; gap: 0.4rem;
    padding: 0.45rem 1rem; border-radius: 100px; border: 1px solid var(--line);
    font-size: 0.8rem; font-weight: 600; background: var(--card); transition: all 0.25s var(--ease);
}
.footer-gh:hover { background: var(--ink); color: var(--paper); }
.footer-bottom { text-align: center; padding: 1.4rem 1rem 2rem; color: var(--ink-3); font-size: 0.78rem; font-family: var(--font-disp); letter-spacing: 0.06em; }

/* ===== 响应式 ===== */
@media (max-width: 860px) {
    .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 640px) {
    .mobile-btn { display: flex; }
    .nav-links {
        display: none; position: absolute; top: 100%; left: 0; right: 0;
        flex-direction: column; align-items: stretch;
        background: rgba(247,244,236,0.97); backdrop-filter: blur(20px);
        padding: 0.6rem; border-bottom: 1px solid var(--line);
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 0.75rem 1rem; }
    .container, .container-wide { padding: 0 1.2rem; }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; }
}