:root {
  --night: #14110d; --night-2: #1d1914; --night-line: rgba(241, 214, 170, .14);
  --on-night: #ece4d4; --on-night-soft: #a99f8c;
  --paper: #f7f3ec; --paper-2: #efe8da; --card: #fffdf7; --ink: #2b2823; --ink-soft: #6f675b; --ink-faint: #9a917f; --line: #e2d9c8;
  --accent: #8a5a2b; --accent-deep: #6d451f; --accent-tint: rgba(138, 90, 43, .08);
  --gold: #f1c98d; --gold-2: #e3b06a; --green: #2f7a4f; --blue: #2f5a7a; --plum: #6b3d5a;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "Noto Serif SC", "SimSun", serif;
}
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif; font-size: 16px; line-height: 1.75; overflow-x: hidden; }
a { color: var(--accent-deep); }
a:focus-visible, button:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
@media (max-width: 520px) { .wrap { padding: 0 16px; } }
.muted { color: var(--ink-faint); }

.top { position: sticky; top: 0; z-index: 10; background: rgba(20, 17, 13, .94); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--night-line); }
.top .wrap { display: flex; align-items: center; gap: 12px; height: 58px; }
.brand { display: flex; align-items: center; gap: 9px; text-decoration: none; color: #fff; font-weight: 700; white-space: nowrap; }
.brand .logo { width: 26px; height: 26px; border-radius: 7px; background: var(--accent); display: grid; place-items: center; }
.brand small { color: var(--on-night-soft); font-weight: 500; font-size: 13.5px; }
.top nav { margin-left: auto; display: flex; align-items: center; gap: 2px; }
.top nav a { color: var(--on-night-soft); text-decoration: none; font-size: 14.5px; padding: 6px 10px; border-radius: 8px; white-space: nowrap; }
.top nav a:hover { color: #fff; background: rgba(255, 255, 255, .06); }
.top nav a.cta { background: var(--gold); color: var(--night); font-weight: 700; margin-left: 4px; }
@media (max-width: 560px) { .top nav .opt { display: none; } }

/* 列表页 */
.ihead { padding: 56px 0 28px; }
@media (max-width: 520px) { .ihead { padding: 36px 0 20px; } }
.kicker { font-size: 13px; font-weight: 700; letter-spacing: 2px; color: var(--accent); }
.ihead h1 { font-family: var(--serif); font-size: clamp(30px, 4.6vw, 46px); line-height: 1.22; margin-top: 10px; }
.ihead p { color: var(--ink-soft); margin-top: 12px; max-width: 36em; font-size: 16.5px; }
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.tabs button { font: inherit; font-size: 14.5px; font-weight: 600; color: var(--ink-soft); background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; cursor: pointer; }
.tabs button i { font-style: normal; color: var(--ink-faint); font-weight: 500; margin-left: 2px; }
.tabs button[aria-pressed="true"] { background: var(--night); color: #fff; border-color: var(--night); }
.tabs button[aria-pressed="true"] i { color: var(--gold); }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; padding-bottom: 72px; }
@media (max-width: 900px) { .grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }
.card { display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px 18px 16px; text-decoration: none; color: inherit; transition: transform .15s, box-shadow .15s, border-color .15s; }
.card:hover { transform: translateY(-2px); border-color: #d4bd94; box-shadow: 0 14px 28px -22px rgba(43, 40, 35, .55); }
.card[hidden] { display: none; }
.meta { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; font-size: 12.5px; color: var(--ink-faint); }
.cat { font-size: 12px; font-weight: 700; color: #fff; border-radius: 6px; padding: 0 8px; line-height: 1.8; }
.c-tutorial { background: var(--blue); } .c-experience { background: var(--accent); } .c-qa { background: var(--plum); }
.star { font-style: normal; font-size: 12px; font-weight: 700; color: var(--accent-deep); background: rgba(241, 201, 141, .45); border-radius: 6px; padding: 0 7px; line-height: 1.8; }
.card h3 { font-size: 17px; line-height: 1.45; margin-top: 10px; }
.card p { font-size: 14px; color: var(--ink-soft); margin-top: 6px; line-height: 1.65; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; padding-top: 12px; }
.tags span { font-size: 12px; color: var(--ink-soft); background: var(--paper-2); border-radius: 6px; padding: 0 8px; line-height: 1.9; }

/* 文章页 */
.post { max-width: 760px; }
.crumb { font-size: 13.5px; color: var(--ink-faint); padding-top: 28px; }
.crumb a { color: var(--ink-soft); text-decoration: none; }
.ph { padding: 14px 0 6px; }
.ph h1 { font-family: var(--serif); font-size: clamp(26px, 4vw, 38px); line-height: 1.3; margin-top: 12px; letter-spacing: .3px; }
.lede { font-size: 17px; color: var(--ink-soft); margin-top: 12px; padding-left: 14px; border-left: 3px solid var(--gold-2); }
.toc { margin-top: 24px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 18px; font-size: 14.5px; }
.toc b { font-size: 13px; letter-spacing: 1px; color: var(--accent); }
.toc ol { margin: 6px 0 0 20px; }
.toc a { color: var(--ink-soft); text-decoration: none; }
.toc a:hover { color: var(--accent-deep); text-decoration: underline; }
.prose { margin-top: 18px; font-size: 17px; line-height: 1.9; }
.prose h2 { font-family: var(--serif); font-size: 24px; line-height: 1.4; margin: 40px 0 6px; scroll-margin-top: 76px; }
.prose h3 { font-size: 18.5px; margin: 26px 0 4px; }
.prose p { margin: 12px 0; }
.prose ul, .prose ol { margin: 12px 0 12px 1.4em; }
.prose li { margin: 6px 0; }
.prose strong { color: #1d1a16; background: linear-gradient(transparent 62%, rgba(241, 201, 141, .55) 62%); }
.prose blockquote { margin: 18px 0; padding: 12px 16px; background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; color: var(--ink-soft); }
.prose blockquote p { margin: 0; }
.prose code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .88em; background: var(--paper-2); border-radius: 5px; padding: 1px 5px; }
.tbl { overflow-x: auto; margin: 16px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; line-height: 1.6; }
.prose th, .prose td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.prose th { background: var(--paper-2); font-weight: 700; white-space: nowrap; }
.prose tr:last-child td { border-bottom: 0; }
.post article > .tags { padding-top: 22px; }

.upsell { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; margin-top: 36px; padding: 20px 22px; border-radius: 18px; background: var(--night); color: var(--on-night); }
.upsell b { color: #fff; font-size: 16.5px; }
.upsell p { font-size: 13.5px; color: var(--on-night-soft); margin-top: 2px; }
.btn { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; font-weight: 700; font-size: 15px; border-radius: 11px; padding: 11px 18px; background: linear-gradient(180deg, #f6d39f, var(--gold-2)); color: var(--night); border: 0; cursor: pointer; white-space: nowrap; font-family: inherit; }
.btn[disabled] { opacity: .6; cursor: default; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }

.comments { margin-top: 44px; }
.comments h2, .related h2 { font-family: var(--serif); font-size: 22px; }
.comments h2 span { font-family: inherit; font-size: 15px; color: var(--ink-faint); font-weight: 500; }
.c-box { margin-top: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.c-box textarea { width: 100%; min-height: 96px; resize: vertical; font: inherit; font-size: 15.5px; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.c-box .row { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 10px; font-size: 13px; color: var(--ink-faint); flex-wrap: wrap; }
.c-box .gate { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 15px; color: var(--ink-soft); }
.c-err { color: #a33a2a; font-size: 13.5px; }
.c-list { list-style: none; margin-top: 14px; }
.c-list li { padding: 14px 2px; border-bottom: 1px solid var(--line); }
.c-list .who { display: flex; gap: 10px; align-items: baseline; font-size: 13.5px; color: var(--ink-faint); }
.c-list .who b { color: var(--ink); font-size: 14.5px; }
.c-list .who button { margin-left: auto; font: inherit; font-size: 12.5px; color: var(--ink-faint); background: none; border: 0; cursor: pointer; }
.c-list p { margin-top: 4px; white-space: pre-wrap; word-break: break-word; }
.c-empty { color: var(--ink-faint); font-size: 14.5px; padding: 12px 2px; }
.related { margin-top: 48px; }
.related .grid { margin-top: 14px; grid-template-columns: repeat(3, 1fr); }
@media (max-width: 760px) { .related .grid { grid-template-columns: 1fr; } }

footer { background: var(--night); color: var(--on-night-soft); padding: 28px 0 36px; font-size: 13.5px; }
footer a { color: var(--on-night); }
footer .dis { margin-top: 8px; color: #776e5f; font-size: 12.5px; }

.lock { font-style: normal; font-size: 12px; font-weight: 700; color: #fff; background: var(--night); border-radius: 6px; padding: 0 7px; line-height: 1.8; }
.lock-box { position: relative; margin-top: 8px; padding: 26px 22px 22px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); text-align: center; }
.lock-box::before { content: ""; position: absolute; left: 0; right: 0; top: -120px; height: 120px; background: linear-gradient(rgba(247, 243, 236, 0), var(--paper)); pointer-events: none; }
.lock-box b { font-family: var(--serif); font-size: 20px; }
.lock-box p { color: var(--ink-soft); font-size: 15px; margin: 8px auto 0; max-width: 30em; }
.lock-box .acts { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 16px; }
.c-free { background: var(--green); }
.free { font-style: normal; font-size: 12px; font-weight: 700; color: var(--green); background: rgba(47, 122, 79, .1); border-radius: 6px; padding: 0 7px; line-height: 1.8; }