/* ===== 卡片基础（所有主题共享）===== */
.card{--cw:440px;--ch:586px;--fs:16px;--hl:#0066ff;--hl-bg:rgba(0,102,255,.1);--fg:#24292e;--muted:#6a737d;--line:#e5e7eb;--code-bg:#f3f4f6;
  width:var(--cw);position:relative;overflow:hidden;background:#fff;color:var(--fg);font-size:var(--fs);line-height:1.75;
  font-family:"PingFang SC","SF Pro Text","Microsoft YaHei",sans-serif;word-break:break-word}
.card.fixed{height:var(--ch)}
.card .inner{padding:28px 24px;position:relative;z-index:1}
.card .pageno{position:absolute;right:14px;bottom:8px;font-size:12px;color:var(--muted);opacity:.8;z-index:2}
.card h1,.card h2,.card h3,.card h4{line-height:1.4;margin:1.1em 0 .6em;font-weight:700}
.card .inner>*:first-child{margin-top:0}
.card h1{font-size:1.6em}.card h2{font-size:1.35em}.card h3{font-size:1.15em}.card h4{font-size:1em}
.card p{margin:.7em 0}
.card a{color:var(--hl);text-decoration:none}
.card strong{color:var(--fg);font-weight:700}
.card img{max-width:100%;border-radius:6px}
.card ul,.card ol{padding-left:1.4em;margin:.7em 0}
.card li{margin:.25em 0}
.card li.task{list-style:none;margin-left:-1.3em}
.card blockquote{margin:.9em 0;padding:.5em 1em;border-left:4px solid var(--hl);background:var(--hl-bg);border-radius:0 8px 8px 0;color:var(--muted)}
.card blockquote p{margin:.3em 0}
.card code{font-family:Consolas,"SF Mono",Menlo,monospace;font-size:.88em;background:var(--hl-bg);color:var(--hl);padding:.12em .4em;border-radius:4px}
.card pre{background:#1f2430;color:#e6e6e6;padding:12px 14px;border-radius:8px;overflow:hidden;white-space:pre-wrap;word-break:break-all;margin:.9em 0}
.card pre code{background:none;color:inherit;padding:0;font-size:.85em}
.card table{border-collapse:collapse;width:100%;margin:.9em 0;font-size:.9em;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.card th,.card td{padding:.5em .7em;border-bottom:1px solid var(--line);text-align:left}
.card th{background:var(--hl-bg);font-weight:700}
.card tr:last-child td{border-bottom:0}
.card hr{border:0;border-top:1px dashed var(--line);margin:1.2em 0}

/* ===== 主题 ===== */
/* 字节范 */
.card.t-bytedance{box-shadow:0 10px 30px rgba(0,104,255,.08)}
.card.t-bytedance::before{content:"";position:absolute;left:0;right:0;top:0;height:8px;background:linear-gradient(90deg,#0066ff,#fa2c19);z-index:2}
.card.t-bytedance::after{content:"";position:absolute;right:15px;top:12px;width:6px;height:6px;border-radius:50%;background:#fa2c19;box-shadow:-12px 0 0 rgba(250,44,25,.6),-24px 0 0 rgba(250,44,25,.4),-36px 0 0 rgba(250,44,25,.2);z-index:2}
.card.t-bytedance .inner{padding-top:40px}
.card.t-bytedance h1,.card.t-bytedance h2{padding-left:.6em;border-left:4px solid #fa2c19}
.card.t-bytedance blockquote{border-left-color:#fa2c19;background:rgba(250,44,25,.05)}
.card.t-bytedance li::marker{color:#fa2c19}
/* 苹果备忘录 */
.card.t-notes{--hl:#d99a00;--hl-bg:rgba(255,204,0,.2);background:#fffdf3}
.card.t-notes .inner{padding-top:40px}
.card.t-notes::before{content:"";position:absolute;left:0;right:0;top:0;height:30px;background:#fff3b0;border-bottom:1px solid #f1dd7a}
.card.t-notes h1,.card.t-notes h2{border-bottom:1px solid #f1e6a8;padding-bottom:.3em}
/* 阿里橙 */
.card.t-ali{--hl:#ff6a00;--hl-bg:rgba(255,106,0,.1)}
.card.t-ali::before{content:"";position:absolute;left:0;top:0;bottom:0;width:6px;background:linear-gradient(#ff6a00,#ffb066)}
.card.t-ali h1,.card.t-ali h2{color:#ff6a00}
.card.t-ali th{background:#ff6a00;color:#fff}
/* 简约高级灰 */
.card.t-gray{--hl:#444;--hl-bg:#eee;--muted:#777;background:#f7f7f8;font-family:"Helvetica Neue","PingFang SC",sans-serif}
.card.t-gray h1,.card.t-gray h2{letter-spacing:.05em;border-bottom:2px solid #333;padding-bottom:.25em;display:inline-block}
/* 极简黑白 */
.card.t-bw{--hl:#000;--hl-bg:#f1f1f1;--line:#000;background:#fff}
.card.t-bw .inner{border:2px solid #000;margin:14px;padding:22px 20px}
.card.t-bw h1,.card.t-bw h2{text-transform:uppercase}
.card.t-bw blockquote{border-left-width:3px;border-radius:0}
.card.t-bw pre{background:#000}
/* 梦幻渐变 */
.card.t-dream{--hl:#7c3aed;--hl-bg:rgba(124,58,237,.1);background:linear-gradient(160deg,#fdf2ff 0%,#e0e7ff 55%,#cffafe 100%)}
.card.t-dream h1,.card.t-dream h2{background:linear-gradient(90deg,#7c3aed,#ec4899);-webkit-background-clip:text;background-clip:text;color:transparent}
/* 清新自然 */
.card.t-fresh{--hl:#2f9e6b;--hl-bg:rgba(47,158,107,.12);background:#f4fbf6}
.card.t-fresh h1,.card.t-fresh h2{color:#1f7a50}
.card.t-fresh h2::before{content:"🌿 "}
/* 紫色小红书 */
.card.t-xhs{--hl:#a855f7;--hl-bg:rgba(168,85,247,.12);background:#fbf7ff}
.card.t-xhs h1{text-align:center;color:#7e22ce}
.card.t-xhs h2{background:linear-gradient(transparent 60%,rgba(168,85,247,.3) 60%);display:inline-block}
.card.t-xhs li::marker{color:#a855f7}
/* 笔记本 */
.card.t-notebook{background-color:#fffef8;background-image:repeating-linear-gradient(transparent,transparent 27px,#d6e4f5 28px);background-position:0 8px}
.card.t-notebook::before{content:"";position:absolute;left:34px;top:0;bottom:0;width:2px;background:#f2a6a6;z-index:2}
.card.t-notebook .inner{padding-left:52px}
.card.t-notebook p,.card.t-notebook li{line-height:28px;margin:0 0 0}
.card.t-notebook h1,.card.t-notebook h2,.card.t-notebook h3{line-height:28px;margin:28px 0 0}
/* 商务简报 */
.card.t-business{--hl:#1d4ed8;--hl-bg:rgba(29,78,216,.08);background:#fff}
.card.t-business::before{content:"";position:absolute;left:0;right:0;top:0;height:56px;background:#1d4ed8}
.card.t-business .inner{padding-top:76px}
.card.t-business h1,.card.t-business h2{color:#1d4ed8;border-bottom:2px solid #1d4ed8;padding-bottom:.2em}
.card.t-business th{background:#1d4ed8;color:#fff}
/* 日本杂志 */
.card.t-japan{--hl:#c1121f;--hl-bg:rgba(193,18,31,.07);background:#faf7f2;font-family:"Hiragino Mincho ProN","Songti SC","SimSun",serif}
.card.t-japan h1,.card.t-japan h2{font-weight:900;letter-spacing:.12em;border-top:3px solid #c1121f;padding-top:.4em}
.card.t-japan .inner{padding:34px 28px}
/* 暗黑科技 */
.card.t-dark{--fg:#d7e3ff;--hl:#4cc9f0;--hl-bg:rgba(76,201,240,.12);--muted:#8aa0c8;--line:#26324d;background:#0b1020}
.card.t-dark strong{color:#fff}
.card.t-dark h1,.card.t-dark h2{color:#4cc9f0;text-shadow:0 0 12px rgba(76,201,240,.5)}
.card.t-dark pre{background:#050810;border:1px solid #26324d}
/* 复古打字机 */
.card.t-typewriter{--hl:#6b4f2a;--hl-bg:rgba(107,79,42,.1);background:#f1e8d4;font-family:"Courier New","Songti SC",monospace}
.card.t-typewriter h1,.card.t-typewriter h2{text-decoration:underline wavy rgba(107,79,42,.4);text-underline-offset:6px}
/* 水彩艺术 */
.card.t-watercolor{--hl:#e76f51;--hl-bg:rgba(231,111,81,.12);background:radial-gradient(circle at 15% 10%,rgba(255,183,197,.55),transparent 45%),radial-gradient(circle at 90% 30%,rgba(168,218,220,.55),transparent 45%),radial-gradient(circle at 30% 95%,rgba(255,230,167,.6),transparent 50%),#fffdf9}
/* 中国传统 */
.card.t-chinese{--hl:#9d2933;--hl-bg:rgba(157,41,51,.08);background:#f6f0e1;font-family:"KaiTi","Kaiti SC","Songti SC",serif}
.card.t-chinese .inner{border:1px solid #9d2933;margin:12px;padding:22px 20px;outline:1px solid rgba(157,41,51,.4);outline-offset:3px}
.card.t-chinese h1,.card.t-chinese h2{color:#9d2933;text-align:center}
/* 儿童童话 */
.card.t-kids{--hl:#ff7aa2;--hl-bg:rgba(255,122,162,.14);background:#fff8e1;font-family:"Comic Sans MS","Yuanti SC","PingFang SC",sans-serif}
.card.t-kids .inner{border:4px dashed #ffb703;margin:12px;border-radius:22px;padding:18px 18px}
.card.t-kids h1,.card.t-kids h2{color:#fb8500}
/* 赛博朋克 */
.card.t-cyber{--fg:#f1f1ff;--hl:#ff2bd6;--hl-bg:rgba(255,43,214,.14);--muted:#b6a8ff;--line:#3a2a6a;background:linear-gradient(160deg,#120629,#1f0b4a 60%,#08122e)}
.card.t-cyber strong{color:#fffb00}
.card.t-cyber h1,.card.t-cyber h2{color:#00f0ff;text-shadow:0 0 10px #00f0ff,2px 2px 0 #ff2bd6}
.card.t-cyber code{color:#00f0ff}
/* 青野晨光 */
.card.t-morning{--hl:#0ea5a4;--hl-bg:rgba(14,165,164,.12);background:linear-gradient(180deg,#e6fffb 0%,#fffef0 100%)}
.card.t-morning h1,.card.t-morning h2{color:#0b7a79}

/* 公式 */
.card .katex{font-size:1.05em}
.card .katex-display{margin:.8em 0;overflow:hidden}
.card .math-block{margin:.6em 0;max-width:100%;overflow:hidden}
.card.t-dark .katex,.card.t-cyber .katex{color:var(--fg)}
/* 代码高亮：背景沿用 pre 的主题色，只取 token 颜色 */
.card pre code.hljs{display:block;padding:0;background:none;overflow:visible}

/* 额外空行占位 */
.card .blank{height:1.75em}
.card.t-notebook .blank{height:28px}

/* 封面 */
.card.cover{display:flex}
.card.cover .inner{flex:1;min-width:0;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:40px 28px}
.card.cover h1{font-size:2.1em;line-height:1.35;margin:0;padding:0;border:0;display:block;text-align:center}
.card.cover .bar{width:48px;height:4px;border-radius:2px;background:var(--hl);margin:22px 0 18px}
.card.cover .sub{font-size:1.1em;margin:0;color:var(--fg)}
.card.cover .note{font-size:.85em;margin:28px 0 0;color:var(--muted)}
.card.t-notebook.cover p,.card.t-notebook.cover h1{line-height:1.6;margin-top:0}

/* 公众号模式：白底、更宽松 */
.card.wechat{--fs:15px}
.card.wechat .inner{padding:24px 20px}