/* ═══════════════════════════════════════════════════════════
   高湾对外网站 — 主题基础层：变量 · 重置 · 排版 · 正文样式
   深蓝科技风 + 金色点缀（继承内部系统视觉基因，对外升级版）
   ═══════════════════════════════════════════════════════════ */

:root {
    --bg-primary: #070b16;
    --bg-secondary: #0a0f1e;
    --bg-alt: #0c1322;
    --bg-card: rgba(26, 35, 50, 0.72);
    --bg-card-solid: #1a2332;
    --bg-card-hover: #1e293b;

    --gold: #D4A853;
    --gold-light: #F0D78C;
    --gold-dark: #A07830;
    --gold-gradient: linear-gradient(135deg, #F0D78C 0%, #D4A853 45%, #A07830 100%);

    --text-primary: #e8edf6;
    --text-secondary: #9aa8bd;
    --text-muted: #64748b;

    --border: rgba(148, 163, 184, 0.14);
    --border-gold: rgba(212, 168, 83, 0.35);

    --blue: #6366F1;
    --red: #EF4444;
    --green: #10B981;
    --orange: #F59E0B;
    --purple: #8B5CF6;

    --radius: 14px;
    --radius-lg: 20px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
    --shadow-gold: 0 8px 40px rgba(212, 168, 83, 0.16);

    --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue",
                 -apple-system, "Segoe UI", sans-serif;
    --font-serif: "Songti SC", "SimSun", Georgia, serif;

    --nav-height: 68px;
    --container: 1180px;
    --container-narrow: 820px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-height) + 16px); }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.75;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

a { color: var(--gold); text-decoration: none; transition: color .2s; }
a:hover { color: var(--gold-light); }

::selection { background: rgba(212, 168, 83, 0.35); color: #fff; }

/* ── 布局容器 ─────────────────────────────────────────── */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: var(--container-narrow); }

.section { padding: 96px 0; position: relative; }
.section-alt { background: var(--bg-alt); }
.section-alt::before,
.section-alt::after {
    content: ""; position: absolute; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-gold), transparent);
}
.section-alt::before { top: 0; }
.section-alt::after { bottom: 0; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-kicker {
    font-size: .78rem; letter-spacing: .42em; text-transform: uppercase;
    color: var(--gold); margin-bottom: 14px; font-weight: 600;
}
.section-head h2 {
    font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 600;
    letter-spacing: .06em; margin-bottom: 14px;
    background: linear-gradient(180deg, #f4f7fb 20%, #b9c4d6 100%);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.section-head p { color: var(--text-secondary); font-size: 1.02rem; }
.section-head b { color: var(--gold-light); font-weight: 600; }

/* ── 按钮 ─────────────────────────────────────────────── */
.btn {
    display: inline-block; padding: 13px 34px; border-radius: 999px;
    font-size: .98rem; letter-spacing: .1em; font-weight: 500;
    transition: transform .25s, box-shadow .25s, background .25s, border-color .25s;
    cursor: pointer; border: 1px solid transparent;
}
.btn-gold {
    background: var(--gold-gradient); color: #14100a; font-weight: 600;
    box-shadow: 0 4px 20px rgba(212, 168, 83, 0.3);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(212, 168, 83, 0.45); color: #14100a; }
.btn-ghost {
    border-color: var(--border-gold); color: var(--gold-light);
    background: rgba(212, 168, 83, 0.06);
}
.btn-ghost:hover { border-color: var(--gold); background: rgba(212, 168, 83, 0.14); color: var(--gold-light); transform: translateY(-2px); }

/* ── 徽章 ─────────────────────────────────────────────── */
.badge {
    display: inline-block; padding: 2px 12px; border-radius: 999px;
    font-size: .74rem; letter-spacing: .08em; font-weight: 500;
    border: 1px solid var(--border);
}
.badge-method { color: var(--gold-light); border-color: var(--border-gold); background: rgba(212,168,83,.1); }
.badge-case { color: #93c5fd; border-color: rgba(99,102,241,.4); background: rgba(99,102,241,.12); }
.badge-research { color: #6ee7b7; border-color: rgba(16,185,129,.4); background: rgba(16,185,129,.1); }
.badge-cat { color: var(--text-secondary); }

.author-badge {
    display: inline-block; padding: 2px 12px; border-radius: 999px;
    font-size: .74rem; letter-spacing: .05em;
}
.author-co { color: #14100a; background: var(--gold-gradient); font-weight: 600; }
.author-solo { color: #a5b4fc; border: 1px solid rgba(99,102,241,.45); background: rgba(99,102,241,.1); }

/* ── 正文排版（文章渲染）───────────────────────────────── */
.prose {
    color: var(--text-primary); font-size: 1.04rem; line-height: 1.95;
}
.prose h2 {
    font-size: 1.42rem; margin: 2.2em 0 .8em; padding-left: 14px;
    border-left: 3px solid var(--gold); letter-spacing: .04em; line-height: 1.4;
}
.prose h3 { font-size: 1.16rem; margin: 1.8em 0 .6em; color: var(--gold-light); }
.prose h4 { font-size: 1.04rem; margin: 1.4em 0 .5em; color: var(--text-primary); }
.prose p { margin: 0 0 1.1em; color: #d3dbe8; }
.prose strong { color: var(--gold-light); font-weight: 600; }
.prose em { color: var(--text-secondary); }
.prose ul, .prose ol { margin: 0 0 1.2em 1.4em; color: #d3dbe8; }
.prose li { margin-bottom: .45em; }
.prose li::marker { color: var(--gold); }
.prose blockquote {
    margin: 1.4em 0; padding: 16px 22px; border-left: 3px solid var(--gold);
    background: rgba(212, 168, 83, 0.06); border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-secondary); font-style: normal;
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose code {
    background: rgba(99, 102, 241, 0.14); color: #c7d2fe;
    padding: 2px 7px; border-radius: 6px; font-size: .88em;
    font-family: "SF Mono", Consolas, monospace;
}
.prose pre {
    background: #0b1120; border: 1px solid var(--border); border-radius: var(--radius);
    padding: 18px 20px; overflow-x: auto; margin: 1.2em 0 1.4em;
}
.prose pre code { background: none; padding: 0; color: #a5b4fc; }
.prose table {
    width: 100%; border-collapse: collapse; margin: 1.3em 0 1.5em; font-size: .94rem;
}
.prose th {
    background: rgba(212, 168, 83, 0.1); color: var(--gold-light);
    font-weight: 600; text-align: left; letter-spacing: .04em;
}
.prose th, .prose td { padding: 10px 14px; border: 1px solid var(--border); }
.prose tr:nth-child(even) td { background: rgba(255, 255, 255, 0.015); }
.prose hr {
    border: none; height: 1px; margin: 2.4em 0;
    background: linear-gradient(90deg, transparent, var(--border-gold), transparent);
}
.prose img { border-radius: var(--radius); margin: 1.2em auto; border: 1px solid var(--border); }
.prose a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--border-gold); }

.prose-compact { font-size: .98rem; }
.prose-compact h2 { font-size: 1.22rem; margin: 1.6em 0 .6em; }
.prose-compact h3 { font-size: 1.06rem; }
.prose-compact p, .prose-compact ul, .prose-compact ol { margin-bottom: .8em; }
.prose-compact table { font-size: .88rem; }
.prose-compact th, .prose-compact td { padding: 7px 11px; }

/* ── 通用提示 ─────────────────────────────────────────── */
.empty-hint {
    text-align: center; color: var(--text-muted); padding: 44px 20px;
    border: 1px dashed var(--border); border-radius: var(--radius);
    letter-spacing: .12em;
}