/* ============================================================
   Roofline — 主题样式
   克制的深色技术风：近黑底 + 青色强调 + 分级色标
   ============================================================ */

:root {
    --bg: #0d1017;
    --surface: #151922;
    --surface-2: #1a1f29;
    --surface-3: #202634;
    --line: rgba(255, 255, 255, 0.09);
    --line-2: rgba(255, 255, 255, 0.16);

    --text: #e6e9ef;
    --text-mid: #b4bcc9;
    --text-dim: #7f8794;

    --accent: #4dd4c4;
    --accent-dim: rgba(77, 212, 196, 0.14);

    --sev-high: #ff6b6b;
    --sev-medium: #f0b45e;
    --sev-low: #6fa8ff;

    --radius: 10px;
    --radius-sm: 6px;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono",
                 Menlo, "Courier New", monospace;
}

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

html, body, ul, ol, li, a, h1, h2, h3, h4, p, figure, blockquote, dl, dt, dd {
    margin: 0;
    padding: 0;
}

a { text-decoration: none; color: inherit; }

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    background: var(--bg);
    /* 顶部一层极淡的光晕，避免纯平面显得死板 */
    background-image: radial-gradient(900px 420px at 50% -160px, rgba(77, 212, 196, 0.07), transparent 70%);
    background-repeat: no-repeat;
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== 容器 ===== */
.page-wrap {
    max-width: 940px;
    margin: 0 auto;
    padding: 26px 22px 48px;
}

.page-wrap.wrap-case { max-width: 820px; }

/* ===== 页头 ===== */
.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    color: var(--accent);
}

/* Roofline 标记：斜坡转平台，下方一个未达上限的实测点 */
.brand-mark {
    width: 25px;
    height: 25px;
    flex: none;
    display: block;
    color: var(--accent);
    transition: transform .25s ease;
}

.brand:hover .brand-mark { transform: translateY(-1px); }

.brand-text {
    font-size: 16.5px;
    font-weight: 600;
    letter-spacing: .4px;
    color: var(--text);
    transition: color .2s ease;
}

.brand:hover .brand-text { color: var(--accent); }

/* ===== Hero ===== */
.hero {
    padding: 40px 0 26px;
}

.hero-title {
    font-size: 27px;
    font-weight: 650;
    letter-spacing: .3px;
    line-height: 1.35;
}

.hero-sub {
    margin-top: 9px;
    color: var(--text-dim);
    font-size: 14.5px;
}

/* ===== 工具栏 ===== */
.toolbar { margin-bottom: 22px; }

.search {
    width: 100%;
    padding: 10px 15px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color .2s ease, background .2s ease;
}

.search::placeholder { color: var(--text-dim); }

.search:focus {
    border-color: rgba(77, 212, 196, 0.45);
    background: var(--surface-2);
}

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 12px;
}

.filter-btn {
    padding: 4px 11px;
    background: transparent;
    border: 1px solid var(--line);
    border-radius: 20px;
    color: var(--text-dim);
    font-size: 12.5px;
    font-family: inherit;
    cursor: pointer;
    transition: all .2s ease;
}

.filter-btn:hover { color: var(--text); border-color: var(--line-2); }

.filter-btn.active {
    background: var(--accent-dim);
    border-color: rgba(77, 212, 196, 0.45);
    color: var(--accent);
}

.filter-btn .n {
    font-family: var(--font-mono);
    font-size: 11px;
    opacity: .6;
    margin-left: 3px;
}

/* ===== 案例卡片 ===== */
.case-list {
    display: flex;
    flex-direction: column;
    gap: 11px;
}

.case-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    transition: border-color .2s ease, background .2s ease, transform .2s ease;
}

.case-card:hover {
    border-color: rgba(77, 212, 196, 0.35);
    background: var(--surface-2);
    transform: translateY(-1px);
}

.case-card-link { display: block; padding: 17px 19px; }

.case-card-top {
    display: flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 8px;
}

.cat {
    font-size: 11.5px;
    font-family: var(--font-mono);
    letter-spacing: .4px;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 2px 8px;
    border-radius: 4px;
}

.badge {
    font-size: 11px;
    font-family: var(--font-mono);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid currentColor;
}

.badge.sev-high { color: var(--sev-high); }
.badge.sev-medium { color: var(--sev-medium); }
.badge.sev-low { color: var(--sev-low); }

.case-title {
    font-size: 17px;
    font-weight: 620;
    line-height: 1.45;
    letter-spacing: .2px;
    transition: color .2s ease;
}

.case-card:hover .case-title { color: var(--accent); }

.case-symptom {
    margin-top: 7px;
    font-size: 13.5px;
    color: var(--text-dim);
    line-height: 1.65;
}

.case-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: 11px;
    font-family: var(--font-mono);
    font-size: 11.5px;
    color: var(--text-dim);
}

.tool-list { opacity: .85; }

.empty, .no-result {
    color: var(--text-dim);
    font-size: 14px;
    padding: 34px 0;
    text-align: center;
}

/* ===== 案例页 ===== */
.case-head { padding: 34px 0 20px; }

.case-head-top {
    display: flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 12px;
    font-family: var(--font-mono);
    font-size: 11.5px;
    color: var(--text-dim);
}

.case-head h1 {
    font-size: 25px;
    font-weight: 650;
    line-height: 1.4;
    letter-spacing: .2px;
}

/* 速览面板：现象 / 根因 / 工具 / 指标 */
.meta-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-left: 2px solid var(--accent);
    border-radius: var(--radius-sm);
    padding: 4px 18px;
    margin-bottom: 30px;
}

.meta-row {
    display: grid;
    grid-template-columns: 72px 1fr;
    gap: 14px;
    padding: 11px 0;
    border-bottom: 1px solid var(--line);
}

.meta-row:last-child { border-bottom: none; }

.meta-row dt {
    font-size: 12.5px;
    color: var(--text-dim);
    font-family: var(--font-mono);
    padding-top: 1px;
}

.meta-row dd {
    font-size: 14px;
    color: var(--text-mid);
    line-height: 1.7;
}

.chip {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11.5px;
    padding: 2px 8px;
    margin: 2px 5px 2px 0;
    border-radius: 4px;
    background: var(--surface-3);
    border: 1px solid var(--line);
    color: var(--text-mid);
}

.chip-tool { color: #8fd4ff; }
.chip-metric { color: #c7a6ff; }
.chip-kw { color: var(--text-dim); }

.dim { color: var(--text-dim); }

/* ===== 正文 ===== */
.case-body { font-size: 15px; color: var(--text-mid); overflow-wrap: break-word; }

.case-body p { margin: 14px 0; }

.case-body h2 {
    font-size: 18.5px;
    font-weight: 640;
    color: var(--text);
    margin: 34px 0 13px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--line);
    scroll-margin-top: 20px;
}

.case-body h3 {
    font-size: 15.5px;
    font-weight: 640;
    color: var(--accent);
    margin: 24px 0 10px;
    scroll-margin-top: 20px;
}

.header-anchor {
    margin-left: 7px;
    color: var(--accent);
    opacity: 0;
    font-weight: 400;
    transition: opacity .2s ease;
}

h2:hover .header-anchor, h3:hover .header-anchor { opacity: .6; }

.case-body a {
    color: var(--accent);
    border-bottom: 1px solid rgba(77, 212, 196, 0.3);
}

.case-body a:hover { border-bottom-color: var(--accent); }

.case-body ul, .case-body ol { margin: 14px 0; padding-left: 22px; }
.case-body li { margin: 6px 0; }
.case-body li::marker { color: var(--accent); }
.case-body strong { color: var(--text); font-weight: 640; }

.case-body hr { height: 1px; background: var(--line); border: none; margin: 28px 0; }

.case-body blockquote {
    margin: 18px 0;
    padding: 11px 17px;
    background: var(--surface);
    border-left: 2px solid var(--sev-medium);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-mid);
}

.case-body blockquote p { margin: 5px 0; }

/* 行内代码 */
.case-body :not(pre) > code {
    font-family: var(--font-mono);
    font-size: 13px;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--surface-3);
    border: 1px solid var(--line);
    color: var(--accent);
    word-break: break-word;
}

/* ===== 图片 / perf 截图 ===== */
.fig {
    margin: 22px 0;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 10px;
}

.fig img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 4px;
    background: #0a0c11;
}

.fig img.zoomable { cursor: zoom-in; }

.fig figcaption {
    margin-top: 9px;
    font-size: 12.5px;
    color: var(--text-dim);
    text-align: center;
    line-height: 1.6;
}

/* ===== 表格 ===== */
.table-wrap {
    margin: 20px 0;
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
}

.table-wrap table { width: 100%; border-collapse: collapse; font-size: 13.5px; }

.table-wrap th, .table-wrap td {
    padding: 9px 13px;
    text-align: left;
    border-bottom: 1px solid var(--line);
}

.table-wrap th {
    background: var(--surface-2);
    color: var(--text);
    font-weight: 620;
    white-space: nowrap;
    font-size: 13px;
}

.table-wrap tr:last-child td { border-bottom: none; }
.table-wrap code { white-space: nowrap; }

/* ===== 代码块 ===== */
.code-block {
    margin: 20px 0;
    background: #0f1218;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.code-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 12px;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
}

.code-lang {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .8px;
    text-transform: uppercase;
    color: var(--text-dim);
}

.code-copy {
    padding: 2px 9px;
    background: transparent;
    border: 1px solid var(--line);
    border-radius: 4px;
    color: var(--text-dim);
    font-size: 11px;
    font-family: inherit;
    cursor: pointer;
    transition: all .2s ease;
}

.code-copy:hover { color: var(--accent); border-color: rgba(77, 212, 196, 0.4); }
.code-copy.copied { color: var(--accent); border-color: var(--accent); }

.code-block pre { margin: 0; padding: 14px 16px; overflow-x: auto; }

.code-block code {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.65;
    color: #d7dce4;
    background: none;
    border: none;
    padding: 0;
    white-space: pre;
    tab-size: 4;
}

.code-block pre::-webkit-scrollbar, .table-wrap::-webkit-scrollbar { height: 6px; }
.code-block pre::-webkit-scrollbar-thumb, .table-wrap::-webkit-scrollbar-thumb {
    background: var(--line-2);
    border-radius: 3px;
}

/* ===== 语法高亮 ===== */
.hljs-comment, .hljs-quote { color: #5d6673; font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-section,
.hljs-doctag, .hljs-name, .hljs-type { color: #4dd4c4; }
.hljs-string, .hljs-regexp, .hljs-addition, .hljs-attribute { color: #9ecf7a; }
.hljs-number, .hljs-symbol, .hljs-bullet, .hljs-link,
.hljs-selector-attr, .hljs-selector-pseudo { color: #e0a561; }
.hljs-title, .hljs-title.function_, .hljs-title.class_, .hljs-built_in { color: #7cb8f5; }
.hljs-variable, .hljs-template-variable, .hljs-selector-id,
.hljs-selector-class, .hljs-attr { color: #d9bd7d; }
.hljs-params { color: #c3cad6; }
.hljs-operator, .hljs-punctuation { color: #62b8c4; }
.hljs-deletion { color: var(--sev-high); }
.hljs-meta { color: #6e7684; }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }

/* ===== 关键词 / 返回 / 页脚 ===== */
.kw-list {
    margin-top: 34px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
}

.back {
    display: inline-block;
    margin-top: 26px;
    font-size: 13.5px;
    color: var(--text-dim);
    transition: color .2s ease;
}

.back:hover { color: var(--accent); }

.site-footer {
    margin-top: 52px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    font-size: 12px;
    color: var(--text-dim);
    font-family: var(--font-mono);
}

/* ===== 图片放大层 ===== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(6, 8, 12, 0.94);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
    cursor: zoom-out;
    animation: lb-in .15s ease;
}

.lightbox[hidden] { display: none; }

.lb-img {
    max-width: 100%;
    max-height: calc(100vh - 120px);
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 16px 50px rgba(0, 0, 0, 0.6);
}

.lb-cap {
    margin-top: 14px;
    font-size: 13px;
    color: var(--text-dim);
    text-align: center;
    max-width: 760px;
}

.lb-close {
    position: absolute;
    top: 16px;
    right: 20px;
    width: 34px;
    height: 34px;
    background: transparent;
    border: 1px solid var(--line-2);
    border-radius: 50%;
    color: var(--text-mid);
    font-size: 21px;
    line-height: 1;
    cursor: pointer;
    transition: all .2s ease;
}

.lb-close:hover { color: var(--text); border-color: var(--text-mid); }

@keyframes lb-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .page-wrap { padding: 20px 15px 36px; }
    .hero { padding: 28px 0 20px; }
    .hero-title { font-size: 22px; }
    .case-head h1 { font-size: 21px; }
    .case-head { padding: 24px 0 16px; }
    .meta-panel { padding: 2px 14px; }
    .meta-row { grid-template-columns: 1fr; gap: 3px; padding: 10px 0; }
    .case-card-link { padding: 15px 16px; }
    .case-title { font-size: 16px; }
    .case-card-foot { flex-direction: column; align-items: flex-start; gap: 3px; }
    .code-block code { font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
    }
    html { scroll-behavior: auto; }
}

@media print {
    body { background: #fff; color: #000; }
    .site-header, .toolbar, .lightbox, .code-copy, .back { display: none !important; }
    .case-body, .case-head h1, .case-body h2, .case-body h3 { color: #000; }
    .meta-panel, .code-block, .fig { border: 1px solid #ccc; background: #fafafa; }
}