/* 小焦点子 — list/detail reading styles. Fonts self-hosted; see src/fonts/NOTICE. */

@font-face { font-family: "Source Serif 4"; src: url("/fonts/source-serif-4-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Source Serif 4"; src: url("/fonts/source-serif-4-latin-400-italic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Source Serif 4"; src: url("/fonts/source-serif-4-latin-600-normal.woff2") format("woff2"); font-weight: 600; font-style: normal; font-display: swap; }
@font-face { font-family: "Source Serif 4"; src: url("/fonts/source-serif-4-latin-700-normal.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Source Sans 3"; src: url("/fonts/source-sans-3-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Source Sans 3"; src: url("/fonts/source-sans-3-latin-500-normal.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "Source Sans 3"; src: url("/fonts/source-sans-3-latin-600-normal.woff2") format("woff2"); font-weight: 600 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Noto Serif SC Subset"; src: url("/fonts/noto-serif-sc-regular.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Noto Serif SC Subset"; src: url("/fonts/noto-serif-sc-bold.woff2") format("woff2"); font-weight: 600 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Noto Sans SC Subset"; src: url("/fonts/noto-sans-sc-regular.woff2") format("woff2"); font-weight: 400 500; font-style: normal; font-display: swap; }
@font-face { font-family: "Noto Sans SC Subset"; src: url("/fonts/noto-sans-sc-bold.woff2") format("woff2"); font-weight: 600 700; font-style: normal; font-display: swap; }

:root {
  color-scheme: light dark;
  --paper: #f5f5f6;
  --card: #ffffff;
  --sunken: #ececef;
  --ink: #111113;
  --ink-soft: #3c3c43;
  --ink-faint: #6e6e76;
  --line: #e6e6ea;
  --line-strong: #d0d0d6;
  --accent: #b2450f;
  --accent-hover: #8c3406;
  --accent-wash: #f8e6d8;
  --warn-bg: #fbe9a6;
  --warn-ink: #5c4300;
  --warn-line: #e3c453;
  --shadow: 0 1px 2px rgb(17 17 19 / 5%);
  --shadow-hover: 0 6px 18px -8px rgb(17 17 19 / 18%);

  --cat-code-video-bg: #e8eef6;  --cat-code-video-fg: #1d4676;
  --cat-growth-topics-bg: #e5f0e7; --cat-growth-topics-fg: #265a2f;
  --cat-global-monetize-bg: #f6e6e9; --cat-global-monetize-fg: #86283a;
  --cat-second-brain-bg: #e4f0f0; --cat-second-brain-fg: #195659;

  --font-serif: "Source Serif 4", "Noto Serif SC Subset", "Noto Serif CJK SC", "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-sans: "Source Sans 3", "Noto Sans SC Subset", "Noto Sans CJK SC", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --page: 82rem;
  --measure: 42rem;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #111113;
    --card: #1c1c20;
    --sunken: #26262b;
    --ink: #f3f3f5;
    --ink-soft: #c6c6cc;
    --ink-faint: #9a9aa3;
    --line: #2c2c32;
    --line-strong: #3e3e46;
    --accent: #f3924f;
    --accent-hover: #ffb07a;
    --accent-wash: #33231a;
    --warn-bg: #4a3b0a;
    --warn-ink: #fbe9a6;
    --warn-line: #7a6314;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%);
    --shadow-hover: 0 8px 22px -10px rgb(0 0 0 / 60%);
    --cat-code-video-bg: #1b2c40;  --cat-code-video-fg: #a9cdf5;
    --cat-growth-topics-bg: #1b3220; --cat-growth-topics-fg: #a6dbb0;
    --cat-global-monetize-bg: #3d1f27; --cat-global-monetize-fg: #f3b4c0;
    --cat-second-brain-bg: #17333a; --cat-second-brain-fg: #9ddde0;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  background: var(--paper); color: var(--ink);
  font-family: var(--font-sans); line-height: 1.65;
  text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-hover); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
::selection { background: var(--warn-bg); color: var(--warn-ink); }

.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 1rem; top: -4rem; z-index: 20; padding: 0.4rem 0.8rem; background: var(--ink); color: var(--paper); text-decoration: none; font-size: 0.85rem; }
.skip-link:focus { top: 0.75rem; }

.wrap, .wrap-wide { width: auto; max-width: none; margin-inline: auto; padding-inline: clamp(1.25rem, 5vw, 5rem); }

/* Header */
.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem 2rem; padding: 0.85rem 0; flex-wrap: wrap; }
.wordmark { display: inline-flex; align-items: baseline; gap: 0.6rem; color: var(--ink); text-decoration: none; }
.wordmark:hover { color: var(--ink); }
.wordmark-zh { font-family: var(--font-sans); font-size: 1.15rem; font-weight: 700; letter-spacing: 0.06em; }
.wordmark-en { font-size: 0.68rem; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); }
.site-nav { display: flex; gap: 1.4rem; font-size: 0.92rem; font-weight: 500; }
.site-nav a { color: var(--ink-soft); text-decoration: none; padding: 0.15rem 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ink); }
.site-nav .lang-switch { border: 1px solid var(--line, rgba(0,0,0,.18)); border-radius: 999px; padding: 0.1rem 0.7rem; }
.site-nav .lang-switch:hover { border-color: var(--ink); }

.site-main { flex: 1; padding: 1.25rem 0 4rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); background: var(--card); padding: 1.75rem 0 2.25rem; color: var(--ink-faint); font-size: 0.82rem; line-height: 1.7; }
.site-footer .wrap { display: grid; gap: 1.25rem 3rem; grid-template-columns: 1fr auto; align-items: start; }
.site-footer p { margin: 0; max-width: 38rem; }
.site-footer a { color: var(--ink-soft); }
.footer-links { display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; margin: 0.5rem 0 0; padding: 0; list-style: none; }
.footer-meta { text-align: left; margin-top: 0.65rem; }

/* Disabled subscribe */
.subscribe { min-width: 16rem; }
.subscribe h2, .sub-title { margin: 0 0 0.45rem; font-size: 0.82rem; font-weight: 700; color: var(--ink); letter-spacing: 0.04em; }
.sub-form { display: flex; gap: 0.4rem; }
.sub-form input { flex: 1; min-width: 0; padding: 0.45rem 0.7rem; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--sunken); color: var(--ink-faint); font: 0.85rem var(--font-sans); }
.sub-form button { padding: 0.45rem 0.8rem; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--sunken); color: var(--ink-faint); font: 600 0.82rem var(--font-sans); }
.sub-note { margin: 0.45rem 0 0; font-size: 0.78rem; color: var(--ink-faint); }

/* Category tabs */
.tabs { margin: 0 0 0.5rem; }
.tabs ul { display: flex; flex-wrap: wrap; gap: 0.45rem; margin: 0; padding: 0; list-style: none; }
.tabs a {
  display: inline-flex; align-items: baseline; gap: 0.35rem;
  padding: 0.38rem 0.9rem; border: 1px solid var(--line-strong); border-radius: 999px;
  background: var(--card); color: var(--ink); text-decoration: none;
  font-size: 0.88rem; font-weight: 500;
}
.tabs a small { font-size: 0.72rem; color: var(--ink-faint); font-weight: 500; }
.tabs a:hover { border-color: var(--ink); }
.tabs a.is-active, .tabs a[aria-current="page"] { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.tabs a.is-active small, .tabs a[aria-current="page"] small { color: color-mix(in srgb, var(--paper) 65%, transparent); }

/* List head */
.list-head, .page-head { margin: 0.85rem 0 1.25rem; }
.list-head h1, .page-head h1 {
  margin: 0.35rem 0 0.4rem; font-family: var(--font-sans); font-weight: 800;
  font-size: clamp(1.7rem, 3.4vw, 2.15rem); line-height: 1.2; letter-spacing: -0.02em;
  word-break: keep-all; line-break: strict;
}
.list-sub, .lede { margin: 0; color: var(--ink-faint); font-size: 0.92rem; line-height: 1.6; max-width: 40rem; }
.page-head .lede { margin-top: 0.4rem; }
.kicker { margin: 0 0 0.5rem; font-size: 0.74rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }

.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem 0.4rem; margin: 0 0 0.65rem; font-size: 0.8rem; color: var(--ink-faint); }
.crumbs a { color: var(--ink-faint); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs i { font-style: normal; color: var(--line-strong); }

/* Tags / chips */
.tagrow { display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem 0.6rem; margin: 0.85rem 0 0; }
.tagrow-label { font-size: 0.75rem; color: var(--ink-faint); }
.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0; padding: 0; list-style: none; }
.chips a, .chips button, .tag, .mini-tag {
  display: inline-flex; align-items: center; margin: 0; padding: 0.15rem 0.55rem;
  border: 1px solid var(--line); border-radius: 999px; background: var(--card);
  color: var(--ink-soft); font: 500 0.72rem/1.5 var(--font-sans); text-decoration: none; cursor: pointer;
}
.chips a:hover, .chips button:hover, .tag:hover, a.mini-tag:hover { border-color: var(--ink); color: var(--ink); }
.chips a.is-active, .chips button[aria-pressed="true"], .tag.is-active { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.cat-tag { display: inline-block; padding: 0.1rem 0.5rem; border-radius: 999px; font-size: 0.68rem; font-weight: 600; letter-spacing: 0.02em; line-height: 1.55; text-decoration: none; }
a.cat-tag:hover { filter: brightness(0.96); }
.cat-code-video { background: var(--cat-code-video-bg); color: var(--cat-code-video-fg); }
.cat-growth-topics { background: var(--cat-growth-topics-bg); color: var(--cat-growth-topics-fg); }
.cat-global-monetize { background: var(--cat-global-monetize-bg); color: var(--cat-global-monetize-fg); }
.cat-second-brain { background: var(--cat-second-brain-bg); color: var(--cat-second-brain-fg); }

.badge-unv {
  display: inline-flex; align-items: center; padding: 0 0.4rem; border: 1px solid var(--warn-line);
  border-radius: 4px; background: var(--warn-bg); color: var(--warn-ink);
  font-size: 0.66rem; font-weight: 700; letter-spacing: 0.04em; line-height: 1.65; white-space: nowrap;
}
mark.unv { background: var(--warn-bg); color: var(--warn-ink); padding: 0 0.25em; border-radius: 3px; font-weight: 600; font-size: 0.9em; }

/* Cards: native-ratio covers, masonry packing, image-above-text */
.grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(17.5rem, 1fr));
}
.grid.is-masonry { display: block; position: relative; }
.grid > li { min-width: 0; }
.card {
  position: relative; display: flex; flex-direction: column;
  padding: 0; overflow: hidden;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); color: inherit; text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); color: inherit; }
.card-cover {
  position: relative; overflow: hidden; background: var(--sunken);
}
.card-cover img {
  width: 100%; height: auto; display: block;
}
.card-cover.is-tall img {
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: bottom center;
}
.card-cat { position: absolute; left: 0.5rem; top: 0.5rem; }
.card-unv { position: absolute; right: 0.5rem; top: 0.5rem; }
.card-body { display: flex; flex-direction: column; gap: 0.35rem; padding: 0.85rem 1rem 0.2rem; flex: 1; }
.card-title {
  margin: 0; font-family: var(--font-sans); font-weight: 700;
  font-size: 0.95rem; line-height: 1.4; letter-spacing: -0.01em;
  word-break: keep-all; line-break: strict;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card:hover .card-title { color: var(--accent); }
.card-summary {
  margin: 0; color: var(--ink-soft); font-size: 0.8rem; line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-meta {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 0.3rem 0.6rem; margin-top: auto; padding: 0.55rem 1rem 0.95rem;
  font-size: 0.72rem; color: var(--ink-faint);
}
.card-meta .handle { font-weight: 600; color: var(--ink-soft); }
.card-when { display: flex; flex-wrap: wrap; gap: 0.35rem 0.6rem; margin-left: auto; }
.card-tags { display: flex; flex-wrap: wrap; gap: 0.25rem; }

/* Browse / search */
.cat-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); }
.cat-card { display: flex; flex-direction: column; padding: 0; overflow: hidden; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); color: inherit; text-decoration: none; }
.cat-card:hover { box-shadow: var(--shadow-hover); color: inherit; }
.cat-card-cover { aspect-ratio: 16 / 9; overflow: hidden; background: var(--sunken); }
.cat-card-cover img { width: 100%; height: 100%; object-fit: cover; object-position: center; display: block; }
.cat-card-body { display: flex; flex-direction: column; gap: 0.5rem; padding: 1.05rem 1.15rem 1.2rem; }
.cat-card h2 { margin: 0; font-size: 1.15rem; }
.cat-card p { margin: 0; color: var(--ink-soft); font-size: 0.9rem; }
.filter-bar { margin: 0 0 1rem; display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 1rem; }
.meta-count { margin: 0; font-size: 0.82rem; color: var(--ink-faint); }
.search-form { display: flex; gap: 0.5rem; margin: 0 0 1.25rem; max-width: 34rem; }
.search-form input[type="search"] { flex: 1; min-width: 0; padding: 0.65rem 0.85rem; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--card); color: var(--ink); font: 1rem var(--font-sans); }
.search-form input::placeholder { color: var(--ink-faint); }
.btn { padding: 0.65rem 1rem; border: 1px solid var(--ink); border-radius: 8px; background: var(--ink); color: var(--paper); font: 600 0.9rem var(--font-sans); cursor: pointer; }
.btn:hover { background: var(--accent); border-color: var(--accent); }
.btn-ghost { background: transparent; color: var(--ink-soft); border-color: var(--line-strong); padding: 0.28rem 0.8rem; font-size: 0.8rem; border-radius: 999px; }
.btn-ghost:hover { background: transparent; color: var(--ink); border-color: var(--ink); }
.empty-state { padding: 2rem 0; color: var(--ink-faint); }

/* Detail */
.essay { width: min(52rem, 100%); margin-inline: auto; }
.hero { margin: 0 0 1.25rem; }
.hero-frame {
  border-radius: 14px; overflow: hidden;
  display: flex; justify-content: center; background: transparent;
}
.hero-frame img {
  width: auto; height: auto; max-width: 100%; max-height: 70vh;
  display: block; object-fit: contain;
}
.hero-credit { margin: 0.45rem 0 0; font-size: 0.78rem; color: var(--ink-faint); }
.hero-credit a { color: var(--ink-faint); text-decoration: none; }
.hero-credit a:hover { color: var(--accent); }

.essay-head { margin-bottom: 1.5rem; }
.essay-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem 0.75rem; margin: 0 0 0.7rem; font-size: 0.82rem; color: var(--ink-faint); }
.essay-title {
  text-wrap: balance; margin: 0 0 0.75rem; font-family: var(--font-sans); font-weight: 800;
  font-size: clamp(1.7rem, 3.6vw, 2.35rem); line-height: 1.25; letter-spacing: -0.025em;
  word-break: keep-all; line-break: strict;
}
.essay-dek { margin: 0 0 0.9rem; font-size: 1.08rem; line-height: 1.7; color: var(--ink-soft); }
.essay-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.essay-body p { text-wrap: pretty; margin: 0 0 1.1rem; font-size: 1.05rem; line-height: 1.85; }
.essay-body code, .essay-section code { padding: 0.1em 0.35em; border-radius: 4px; background: var(--sunken); font: 0.88em ui-monospace, SFMono-Regular, Menlo, monospace; }

.unv-note { margin: 0 0 1.5rem; padding: 0.95rem 1.1rem; border: 1px solid var(--warn-line); border-left-width: 4px; border-radius: 8px; background: var(--warn-bg); color: var(--warn-ink); }
.unv-note h2 { margin: 0 0 0.45rem; display: flex; align-items: center; gap: 0.45rem; font-size: 0.9rem; font-weight: 700; }
.unv-note p { margin: 0 0 0.45rem; font-size: 0.86rem; line-height: 1.65; }
.unv-note ul { margin: 0; padding-left: 1.2rem; font-size: 0.9rem; line-height: 1.65; }
.unv-note .badge-unv { background: var(--card); }

.why { margin: 2rem 0 0; padding: 1.15rem 1.25rem; background: var(--accent-wash); border-radius: var(--radius); }
.why h2, .essay-section h2 { margin: 0 0 0.5rem; font-size: 0.74rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }
.why p { margin: 0; font-size: 1.05rem; line-height: 1.8; }

.essay-section { margin: 2.1rem 0 0; }
.essay-section h2 { color: var(--ink-faint); margin-bottom: 0.85rem; }
.source-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.75rem; }
.source-card {
  display: grid; grid-template-columns: auto 1fr auto; gap: 0.75rem 1rem; align-items: center;
  padding: 1.05rem 1.15rem; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.source-card .x-icon, .source-card .gh-icon { width: 1.6rem; height: 1.6rem; padding: 0.32rem; border-radius: 50%; background: var(--ink); fill: var(--paper); color: var(--paper); flex: none; }
.badge-intro { display: inline-block; margin-left: 0.45rem; padding: 0.05rem 0.4rem; border: 1px solid var(--line, rgba(0,0,0,.18)); border-radius: 999px; font-size: 0.68rem; font-weight: 600; color: var(--ink-faint); vertical-align: middle; }
.source-card .who { margin: 0; font-weight: 700; font-size: 1rem; }
.source-card .handle { margin-left: 0.4rem; font-weight: 500; color: var(--ink-faint); }
.source-card .source-meta { margin: 0.15rem 0 0; font-size: 0.82rem; color: var(--ink-faint); }
.source-card .source-url { display: block; margin-top: 0.15rem; font-size: 0.74rem; color: var(--ink-faint); overflow-wrap: anywhere; }
.source-card .source-link {
  display: inline-flex; align-items: center; padding: 0.45rem 0.8rem;
  border-radius: 999px; background: var(--ink); color: var(--paper);
  text-decoration: none; font-size: 0.82rem; font-weight: 600; white-space: nowrap;
}
.source-card .source-link:hover { background: var(--accent); color: var(--paper); }

.disclaimer { margin: 2.25rem 0 0; padding: 1rem 0 0; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.4rem 1rem; font-size: 0.84rem; color: var(--ink-faint); }
.disclaimer strong { font-size: 0.95rem; letter-spacing: 0.16em; color: var(--ink); }

.prevnext { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin: 2rem 0 0; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.pn { display: flex; flex-direction: column; gap: 0.25rem; padding: 0.85rem 1rem; border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: inherit; text-decoration: none; }
.pn:hover { border-color: var(--ink); color: inherit; }
.pn-next { text-align: right; }
.pn-label { font-size: 0.72rem; color: var(--ink-faint); }
.pn-title { font-weight: 650; font-size: 0.92rem; line-height: 1.4; }
.pn-empty { visibility: hidden; }

.not-found { max-width: var(--measure); padding: 2rem 0 3rem; }
.not-found h1 { font-size: 2rem; margin: 0 0 0.8rem; }

@media (max-width: 800px) {
  .site-footer .wrap { grid-template-columns: 1fr; }
  .footer-meta { text-align: left; }
  .source-card { grid-template-columns: auto 1fr; }
  .source-card .source-link { grid-column: 2; justify-self: start; }
}
@media (max-width: 640px) {
  .prevnext { grid-template-columns: 1fr; }
  .pn-next { text-align: left; }
  .wordmark-en { display: none; }
  .site-main { padding-top: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .card { transition: none; }
  .card:hover { transform: none; }
}
@media print {
  .site-nav, .search-form, .tabs, .tagrow, .chips, .skip-link, .subscribe, .prevnext { display: none !important; }
  body { background: #fff; color: #000; }
  .card, .source-card { box-shadow: none; }
}