:root {
            --ink: #0f2e2c;
            --ink-soft: #3d6360;
            --teal: #0d9488;
            --cyan: #0891b2;
            --mint: #99f6e4;
            --card: rgba(255, 255, 255, 0.82);
            --line: rgba(13, 148, 136, 0.22);
        }
        .reveal {
            font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
            color: var(--ink);
        }
        /* 全局清新渐变背景 + 细颗粒质感（还原原 PPT 风格）。
           渐变画在 .reveal 根元素上（全屏、静态）；需要特殊背景的页面用 data-background-gradient 覆盖。 */
        .reveal {
            background:
                radial-gradient(120% 90% at 85% 12%, rgba(6, 182, 212, 0.30) 0%, rgba(6, 182, 212, 0) 55%),
                radial-gradient(110% 100% at 92% 85%, rgba(16, 185, 129, 0.28) 0%, rgba(16, 185, 129, 0) 60%),
                radial-gradient(100% 100% at 8% 90%, rgba(153, 246, 228, 0.5) 0%, rgba(153, 246, 228, 0) 55%),
                linear-gradient(115deg, #f8fdfc 0%, #eefdf8 45%, #d9f6f0 100%);
        }
        .reveal::after {
            content: "";
            position: absolute; inset: 0;
            z-index: 100;
            pointer-events: none;
            opacity: 0.05;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
        }
        .reveal h1, .reveal h2, .reveal h3 { font-weight: 700; color: var(--ink); }
        .reveal h2 { font-size: 1.8em; margin-bottom: 0.4em; }

        .kicker {
            display: inline-block;
            font-size: 0.75em; letter-spacing: 0.35em; font-weight: 600;
            color: var(--cyan); text-transform: uppercase;
            border: 1px solid var(--line); border-radius: 999px;
            padding: 0.25em 1.1em; margin-bottom: 0.6em;
            background: rgba(255,255,255,0.6);
        }
        .card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: 18px;
            box-shadow: 0 10px 30px rgba(13, 148, 136, 0.10);
            padding: 0.55em 0.75em;
        }
        .term { color: var(--cyan); font-weight: 700; }
        .muted { color: var(--ink-soft); }
        .accent-grad {
            background: linear-gradient(100deg, #0d9488, #0891b2 60%, #0ea5e9);
            -webkit-background-clip: text; background-clip: text; color: transparent;
        }

        /* 链接按钮 */
        a.pill {
            display: inline-flex; align-items: center; gap: 0.45em;
            padding: 0.38em 1.15em;
            border-radius: 999px;
            background: linear-gradient(100deg, #0d9488, #0891b2);
            color: #fff !important; font-size: 0.9em; font-weight: 600;
            text-decoration: none;
            box-shadow: 0 6px 16px rgba(8, 145, 178, 0.35);
            transition: transform 0.15s ease, box-shadow 0.15s ease;
        }
        a.pill:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(8, 145, 178, 0.45); color: #fff; }
        a.pill.ghost {
            background: rgba(255,255,255,0.75); color: var(--cyan) !important;
            border: 1px solid var(--line); box-shadow: none;
        }
        a.pill.ghost:hover { background: #fff; }
        .links-row { display: flex; gap: 0.6em; justify-content: center; align-items: center; flex-wrap: wrap; margin-top: 0.5em; }

        /* 封面 */
        .cover-num {
            font-size: 1.05em; color: var(--teal); letter-spacing: 0.5em; font-weight: 600;
        }
        .cover-title { font-size: 3.4em; line-height: 1.1; margin: 0.15em 0; }

        /* 目录 */
        .toc { display: flex; gap: 28px; justify-content: center; margin-top: 0.6em; }
        .toc-item {
            width: 340px; padding: 0.9em 0.85em; text-align: left;
        }
        .toc-item .no {
            font-size: 1.9em; font-weight: 800;
            background: linear-gradient(120deg, #0d9488, #0ea5e9);
            -webkit-background-clip: text; background-clip: text; color: transparent;
        }
        .toc-item .t { font-size: 1.25em; font-weight: 700; margin-top: 0.15em; }
        .toc-item .d { font-size: 0.8em; color: var(--ink-soft); margin-top: 0.3em; line-height: 1.6; }

        /* LLM 页：名字来源 = 三个英文单词的翻译 */
        .llm-words { display: flex; gap: 22px; justify-content: center; margin: 0.4em 0; }
        .llm-words .word {
            min-width: 210px; padding: 0.45em 0.9em 0.6em; text-align: center;
        }
        .llm-words .en {
            display: block; font-size: 0.85em; color: var(--ink-soft);
            letter-spacing: 0.08em; margin-bottom: 0.1em;
        }
        .llm-words .zh { font-size: 2.4em; font-weight: 800; color: var(--ink); }
        .flow-note { font-size: 1.02em; color: var(--ink-soft); }

        /* 词汇页 */
        .defs { width: 980px; margin: 0 auto; text-align: left; }
        .defs .card { margin-bottom: 0.45em; padding: 0.55em 0.95em; }
        .defs .name { font-weight: 800; color: var(--cyan); }
        .defs .en { font-size: 0.85em; color: var(--ink-soft); font-weight: 400; }

        /* Prompt / Harness 双栏 */
        .duo { display: flex; gap: 24px; width: 1130px; margin: 0.3em auto 0; text-align: left; }
        .duo > div { flex: 1; }
        .duo h3 { font-size: 1.25em; margin: 0 0 0.3em; }
        .formula {
            display: inline-block; font-size: 0.8em; font-weight: 700; color: var(--teal);
            background: rgba(153, 246, 228, 0.45); border-radius: 8px; padding: 0.2em 0.7em; margin-bottom: 0.45em;
        }
        .prompt-box {
            font-size: 0.78em; line-height: 1.7; color: var(--ink);
            background: #f4fbfa; border: 1px dashed var(--line); border-radius: 12px;
            padding: 0.6em 0.9em; text-align: left;
        }
        .prompt-box b { color: var(--cyan); }
        .harness-list { font-size: 0.92em; line-height: 1.95; }
        .harness-list .eg { color: var(--ink-soft); }

        /* Agent = model + harness：大框图形 */
        .agent-box {
            width: 780px; margin: 0.25em auto 0.5em;
            border: 3px solid var(--teal); border-radius: 22px;
            background: rgba(255, 255, 255, 0.55);
            padding: 0.4em 0.6em 0.6em;
            box-shadow: 0 10px 26px rgba(13, 148, 136, 0.14);
        }
        .agent-box .agent-title {
            font-size: 1.15em; font-weight: 800; color: var(--teal);
            text-align: center; margin-bottom: 0.25em;
        }
        .agent-inner { display: flex; align-items: center; justify-content: center; gap: 18px; }
        .agent-part {
            background: #fff; border: 1px solid var(--line); border-radius: 14px;
            padding: 0.5em 1.5em; font-size: 1.1em; font-weight: 700;
            box-shadow: 0 6px 14px rgba(13, 148, 136, 0.10);
        }
        .agent-part .zh { font-weight: 400; color: var(--ink-soft); font-size: 0.82em; }
        .agent-inner .plus { font-size: 1.5em; font-weight: 800; color: var(--teal); }

        .logo-row { display: flex; gap: 16px; justify-content: center; margin: 0.2em 0 0.45em; }
        .logo-card {
            width: 170px; height: 84px; display: flex; align-items: center; justify-content: center;
            background: #fff; border: 1px solid var(--line); border-radius: 14px;
            box-shadow: 0 8px 18px rgba(13, 148, 136, 0.10); padding: 10px;
        }
        .logo-card img { max-width: 100%; max-height: 100%; object-fit: contain; margin: 0; }
        .model-chip {
            padding: 0.45em 1.1em; border-radius: 999px; font-size: 0.84em; font-weight: 700;
            background: linear-gradient(100deg, rgba(13,148,136,0.12), rgba(8,145,178,0.12));
            border: 1px solid var(--line); color: var(--ink);
        }
        .row-label { font-size: 0.72em; letter-spacing: 0.25em; color: var(--ink-soft); font-weight: 700; margin-bottom: 0.35em; }

        /* 章节分隔页 */
        .divider { color: #fff; }
        .divider h2 { color: #fff; font-size: 2.6em; }
        .divider .kicker { color: #a7f3ef; border-color: rgba(255,255,255,0.35); background: rgba(255,255,255,0.08); }
        .divider .sub { color: #cffafe; font-size: 0.85em; }

        /* 截图页 */
        .shot-row { display: flex; gap: 20px; align-items: flex-start; justify-content: center; }
        .shot { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 8px; box-shadow: 0 12px 28px rgba(13,148,136,0.14); }
        .shot img { max-height: 430px; margin: 0; border-radius: 8px; }
        .shot.wide img { max-height: 380px; }
        .shot .cap { color: var(--ink-soft); font-size: 0.62em; margin: 0.35em 0 0.1em; text-align: center; }
        .steps { text-align: left; font-size: 0.86em; line-height: 1.7; }
        .steps li { margin-bottom: 0.45em; }
        .kbd {
            font-family: Consolas, monospace; font-size: 0.92em; font-weight: 700;
            background: #0f2e2c; color: #a7f3d0; border-radius: 6px; padding: 0.1em 0.5em;
        }
        .cmdline {
            font-family: Consolas, monospace; font-size: 0.95em;
            background: #0f2e2c; color: #d1fae5; border-radius: 10px;
            padding: 0.55em 1em; display: inline-block; margin: 0.3em 0;
        }

        /* 链接汇总 */
        .link-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; width: 1060px; margin: 0.3em auto 0; text-align: left; }
        .link-card { display: flex; flex-direction: column; gap: 0.22em; padding: 0.55em 0.85em; }
        .link-card .lc-name { font-weight: 800; font-size: 1.0em; }
        .link-card .lc-desc { font-size: 0.76em; color: var(--ink-soft); }
        .link-card a.lc-url { font-size: 0.8em; color: var(--cyan); word-break: break-all; }
        .link-card .lc-url:hover { text-decoration: underline; }

        .reveal .progress { color: var(--cyan); }
        .reveal .slide-number { background: rgba(255,255,255,0.7); color: var(--teal); font-size: 15px; border-radius: 8px; }

        /* 返回课程目录（网站导航页） */
        .home-link {
            position: fixed; top: 14px; left: 16px; z-index: 300;
            font-size: 13px; font-weight: 600;
            color: var(--ink-soft); text-decoration: none;
            background: rgba(255,255,255,0.78);
            border: 1px solid var(--line); border-radius: 999px;
            padding: 4px 14px;
            box-shadow: 0 4px 12px rgba(13, 148, 136, 0.12);
        }
        .home-link:hover { background: #fff; color: var(--cyan); }