/* =========================================================
   MINOT WITH AI . Design Tokens
   Palette: Soft Structuralism, cool silver-grey, graphite
            text, single desaturated slate-blue accent.
   Theme lock: ONE palette family for the whole page,
               dark variant mirrors light under prefers-color-scheme.
   Shape lock: cards 20px / pills 9999px / small 10px.
   Font pair: Geist + Geist Mono (self-hosted, latin subset),
              CJK falls back to system PingFang SC / 雅黑.
   No em-dashes in any visible text.
   ========================================================= */

/* ---------- Self-hosted fonts (latin subset only) ---------- */
@font-face {
  font-family: 'Geist';
  font-style: normal;
  font-weight: 300 900;
  font-display: swap;
  src: url('../fonts/geist-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC,
                 U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
                 U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
                 U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 300 900;
  font-display: swap;
  src: url('../fonts/geist-mono-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC,
                 U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
                 U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
                 U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ---------- Theme tokens ---------- */
:root {
  /* Shape lock */
  --r-card: 20px;
  --r-pill: 9999px;
  --r-sm: 10px;

  /* Motion */
  --ease: cubic-bezier(0.32, 0.72, 0, 1);
  --t-fast: 240ms;
  --t-base: 480ms;
  --t-slow: 760ms;

  /* Z-index scale (systemic layers only) */
  --z-nav: 100;
  --z-menu: 90;
  --z-grain: 80;

  /* Layout */
  --max: 1440px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --pad-section: clamp(5rem, 10vw, 8.5rem);
}

/* Light theme (default) */
:root,
:root.theme-light {
  --bg:        #F4F4F2;
  --bg-2:      #ECECEA;
  --bg-3:      #E2E2DF;
  --card-bg:   #FAFAF8;
  --text-1:    #14161A;
  --text-2:    #5C6168;
  --text-3:    #8C9098;
  --accent:    #3D5A73;
  --accent-2:  #5C7A95;
  --hairline:  rgba(20, 22, 26, 0.08);
  --hairline-2:rgba(20, 22, 26, 0.04);
  --shadow-card: 0 30px 60px -30px rgba(20, 22, 26, 0.18),
                 0 8px 20px -10px rgba(20, 22, 26, 0.10);
  --shadow-tile: 0 24px 48px -24px rgba(20, 22, 26, 0.20),
                 0 4px 12px -4px rgba(20, 22, 26, 0.08);
  --glass-bg:  rgba(244, 244, 242, 0.72);
  --glass-bd:  rgba(20, 22, 26, 0.08);
  --glass-hl:  inset 0 1px 0 rgba(255, 255, 255, 0.6);
  --btn-primary-bg: var(--text-1);
  --btn-primary-fg: var(--bg);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #14161A;
    --bg-2:      #1B1E23;
    --bg-3:      #232730;
    --card-bg:   #1B1E23;
    --text-1:    #ECECEA;
    --text-2:    #9CA0A8;
    --text-3:    #6B7078;
    --accent:    #7B96B0;
    --accent-2:  #9CB3C9;
    --hairline:  rgba(236, 236, 234, 0.08);
    --hairline-2:rgba(236, 236, 234, 0.04);
    --shadow-card: 0 30px 60px -30px rgba(0, 0, 0, 0.6),
                   0 8px 20px -10px rgba(0, 0, 0, 0.4);
    --shadow-tile: 0 24px 48px -24px rgba(0, 0, 0, 0.6),
                   0 4px 12px -4px rgba(0, 0, 0, 0.4);
    --glass-bg:  rgba(20, 22, 26, 0.72);
    --glass-bd:  rgba(236, 236, 234, 0.10);
    --glass-hl:  inset 0 1px 0 rgba(255, 255, 255, 0.06);
    --btn-primary-bg: var(--text-1);
    --btn-primary-fg: var(--bg);
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}
img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; cursor: pointer; background: none; border: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }

/* ---------- Base ---------- */
body {
  font-family: 'Geist', -apple-system, BlinkMacSystemFont,
               'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei',
               system-ui, sans-serif;
  font-weight: 400;
  font-feature-settings: 'ss01', 'cv11';
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Skip link */
.skip {
  position: absolute; left: -9999px;
  &:focus {
    left: 1rem; top: 1rem; z-index: 999;
    background: var(--text-1); color: var(--bg);
    padding: .5rem 1rem; border-radius: var(--r-sm);
  }
}

/* ---------- Typographic scale ---------- */
.display {
  font-family: inherit;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.05;
  color: var(--text-1);
}
.eyebrow {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-2);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}
.eyebrow::before {
  content: "";
  width: 1.5rem; height: 1px;
  background: var(--hairline);
  display: inline-block;
}
.lede, .section-sub {
  font-size: clamp(1rem, 1.2vw, 1.125rem);
  color: var(--text-2);
  line-height: 1.55;
  max-width: 38ch;
}

/* ---------- Floating Island Nav ---------- */
.nav {
  position: fixed;
  top: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-nav);
  width: min(calc(100% - 2rem), 720px);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.5rem 0.5rem 0.5rem 1.25rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-bd);
  border-radius: var(--r-pill);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: var(--glass-hl), 0 8px 24px -12px rgba(0,0,0,0.10);
  transition: transform var(--t-base) var(--ease),
              background var(--t-base) var(--ease);
}
.nav-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-1);
}
.nav-mark-glyph { color: var(--accent); display: inline-flex; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-links a {
  font-size: 13.5px;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--r-pill);
  color: var(--text-1);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.nav-links a:hover { background: var(--bg-2); }
.nav-links a.nav-cta {
  background: var(--text-1);
  color: var(--bg);
  padding: 0.55rem 1rem;
  margin-left: 0.25rem;
  transition: transform var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.nav-links a.nav-cta:hover { transform: translateY(-1px); }
.nav-burger {
  display: none;
  width: 38px; height: 38px;
  border-radius: var(--r-pill);
  align-items: center; justify-content: center;
  position: relative;
}
.nav-burger span {
  position: absolute;
  left: 10px; right: 10px;
  height: 1.5px;
  background: var(--text-1);
  transition: transform var(--t-base) var(--ease),
              opacity var(--t-fast) var(--ease),
              top var(--t-base) var(--ease);
}
.nav-burger span:nth-child(1) { top: 13px; }
.nav-burger span:nth-child(2) { top: 21px; }
.nav-burger[aria-expanded="true"] span:nth-child(1) {
  top: 17px; transform: rotate(45deg);
}
.nav-burger[aria-expanded="true"] span:nth-child(2) {
  top: 17px; transform: rotate(-45deg);
}

/* Mobile menu overlay (hamburger morph) */
.menu {
  position: fixed; inset: 0;
  z-index: var(--z-menu);
  background: var(--glass-bg);
  backdrop-filter: blur(28px) saturate(140%);
  -webkit-backdrop-filter: blur(28px) saturate(140%);
  display: grid; place-items: center;
  opacity: 0; pointer-events: none;
  transition: opacity var(--t-base) var(--ease);
}
.menu[data-open="true"] { opacity: 1; pointer-events: auto; }
.menu-links {
  display: flex; flex-direction: column;
  align-items: center; gap: 1.5rem;
}
.menu-links a {
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-1);
  opacity: 0; transform: translateY(12px);
  transition: opacity var(--t-base) var(--ease) var(--t-fast),
              transform var(--t-base) var(--ease) var(--t-fast);
}
.menu[data-open="true"] .menu-links a {
  opacity: 1; transform: translateY(0);
}
.menu[data-open="true"] .menu-links a:nth-child(2) { transition-delay: 180ms; }
.menu[data-open="true"] .menu-links a:nth-child(3) { transition-delay: 260ms; }
.menu[data-open="true"] .menu-links a:nth-child(4) { transition-delay: 340ms; }

/* ---------- Hero (Editorial Split, asymmetric) ---------- */
.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  padding: clamp(6rem, 12vh, 8rem) var(--gutter) clamp(4rem, 8vw, 7rem);
  max-width: var(--max);
  margin: 0 auto;
  min-height: calc(100dvh - 6rem);
  align-items: center;
}
@media (min-width: 1024px) {
  .hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 9fr);
    gap: clamp(3rem, 7vw, 7rem);
  }
}
.hero-text {
  display: flex; flex-direction: column;
  gap: 1.5rem;
  max-width: 36rem;
}
.hero-text .display {
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  letter-spacing: -0.035em;
  line-height: 1.02;
}
.hero-ctas {
  display: flex; gap: 0.75rem; align-items: center;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}
.hero-visual {
  position: relative;
}
.hero-frame {
  position: relative;
  padding: 0.75rem;
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: calc(var(--r-card) + 0.5rem);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.hero-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.4);
  pointer-events: none;
}
.hero-img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-card);
}
@media (prefers-color-scheme: dark) {
  .hero-frame::after { box-shadow: inset 0 1px 0 rgba(255,255,255,0.06); }
}

/* ---------- Buttons (Button-in-Button trailing icon) ---------- */
.btn {
  display: inline-flex; align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 0.85rem 0.85rem 1.4rem;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.005em;
  background: transparent;
  color: var(--text-1);
  transition: transform var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease);
  will-change: transform;
}
.btn-icon {
  width: 28px; height: 28px;
  border-radius: var(--r-pill);
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  transition: transform var(--t-base) var(--ease),
              background var(--t-fast) var(--ease);
}
.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-fg);
}
.btn-primary .btn-icon {
  background: rgba(255, 255, 255, 0.12);
  color: var(--btn-primary-fg);
}
.btn-primary:hover { transform: translateY(-1px); }
.btn-primary:hover .btn-icon {
  transform: translateX(2px) translateY(-1px);
  background: rgba(255, 255, 255, 0.18);
}
.btn-primary:active { transform: scale(0.985); }
.btn-secondary {
  background: var(--bg-2);
  color: var(--text-1);
  padding: 0.85rem 1.4rem;
}
.btn-secondary:hover { background: var(--bg-3); transform: translateY(-1px); }
.btn-tertiary {
  padding: 0;
  color: var(--accent);
  background: transparent;
}
.btn-tertiary .btn-icon {
  background: transparent;
  color: var(--accent);
  width: auto; padding-left: 0;
}
.btn-tertiary:hover .btn-icon { transform: translateX(3px); }
.btn-large {
  padding: 1rem 1rem 1rem 1.6rem;
  font-size: 15px;
}
.btn-large .btn-icon { width: 32px; height: 32px; }

/* ---------- Section heads ---------- */
.section-head {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(2rem, 4vw, 3rem);
  display: flex; flex-direction: column; gap: 1rem;
}
.section-head .display {
  font-size: clamp(1.875rem, 3.5vw, 2.75rem);
  letter-spacing: -0.03em;
}

/* ---------- Work / Bento (asymmetric, 4 cells) ---------- */
.work {
  padding: clamp(2rem, 4vw, 4rem) 0 var(--pad-section);
}
.bento {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .bento {
    grid-template-columns: repeat(6, 1fr);
    grid-auto-rows: minmax(220px, auto);
  }
  .cell-1 { grid-column: span 4; }
  .cell-2 { grid-column: span 2; }
  .cell-3 { grid-column: span 2; }
  .cell-4 { grid-column: span 4; }
}
@media (min-width: 1100px) {
  .bento {
    grid-auto-rows: minmax(280px, auto);
  }
  .cell-1 { grid-column: span 3; }
  .cell-2 { grid-column: span 3; }
  .cell-3 { grid-column: span 4; }
  .cell-4 { grid-column: span 2; }
}

.tile {
  display: block;
  height: 100%;
  border-radius: var(--r-card);
  transition: transform var(--t-base) var(--ease);
}
.tile:hover { transform: translateY(-2px); }
.tile-frame {
  position: relative;
  padding: 0.6rem;
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: calc(var(--r-card) + 0.4rem);
  box-shadow: var(--shadow-tile);
  overflow: hidden;
  transition: box-shadow var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease);
}
.tile-frame::after {
  content: "";
  position: absolute; inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.35);
  pointer-events: none;
}
@media (prefers-color-scheme: dark) {
  .tile-frame::after { box-shadow: inset 0 1px 0 rgba(255,255,255,0.05); }
}
.tile:hover .tile-frame {
  box-shadow: 0 32px 64px -28px rgba(20,22,26,0.30),
              0 8px 18px -8px rgba(20,22,26,0.16);
}
.tile img {
  width: 100%;
  height: 100%;
  min-height: 240px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: calc(var(--r-card) - 0.25rem);
}
.tile-meta {
  padding: 1rem 0.25rem 0.5rem;
  display: flex; align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}
.tile-title {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--text-1);
}
.tile-sub {
  font-size: 12px;
  color: var(--text-2);
  font-family: 'Geist Mono', ui-monospace, monospace;
  letter-spacing: 0.02em;
}

/* ---------- Approach (vertical stack, hairline dividers, NO cards) ---------- */
.approach {
  padding: var(--pad-section) 0;
  border-top: 1px solid var(--hairline);
}
.approach .section-head { padding-bottom: clamp(3rem, 5vw, 4.5rem); }
.principles {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.principle {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding: clamp(2rem, 4vw, 3rem) 0;
  border-bottom: 1px solid var(--hairline);
  align-items: start;
}
.principle:first-child { border-top: 1px solid var(--hairline); }
.principle-num {
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 13px;
  color: var(--text-3);
  letter-spacing: 0.05em;
  padding-top: 0.35rem;
}
.principle-body h3 {
  font-size: clamp(1.125rem, 1.8vw, 1.375rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--text-1);
  margin-bottom: 0.5rem;
}
.principle-body p {
  color: var(--text-2);
  max-width: 56ch;
  line-height: 1.65;
}

/* ---------- Featured (full-width image) ---------- */
.featured {
  padding: var(--pad-section) 0;
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
}
.featured-frame {
  padding: 0.75rem;
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: calc(var(--r-card) + 0.5rem);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin: 0 var(--gutter);
}
.featured-frame img {
  width: 100%;
  border-radius: var(--r-card);
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.featured-text {
  padding: 0 var(--gutter);
  display: flex; flex-direction: column; gap: 1.25rem;
  max-width: 60ch;
}
.featured-text .display {
  font-size: clamp(1.875rem, 3.5vw, 2.75rem);
  letter-spacing: -0.03em;
}
.featured-text p {
  color: var(--text-2);
  line-height: 1.7;
}

/* ---------- About (two-column) ---------- */
.about {
  padding: var(--pad-section) var(--gutter);
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: clamp(2rem, 5vw, 5rem);
  border-top: 1px solid var(--hairline);
}
@media (min-width: 880px) {
  .about { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); }
}
.about-left .display {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.03em;
}
.about-right {
  display: flex; flex-direction: column;
  gap: 1.25rem;
  max-width: 60ch;
}
.about-right p {
  color: var(--text-2);
  line-height: 1.7;
}

/* ---------- Contact (centered minimal CTA) ---------- */
.contact {
  padding: var(--pad-section) var(--gutter);
  max-width: var(--max);
  margin: 0 auto;
  text-align: center;
  display: flex; flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  border-top: 1px solid var(--hairline);
}
.contact .display {
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  letter-spacing: -0.035em;
}
.contact-sub { text-align: center; max-width: none; }
.contact-foot {
  font-size: 13px;
  color: var(--text-3);
  font-family: 'Geist Mono', ui-monospace, monospace;
  letter-spacing: 0.02em;
}

/* ---------- Footer ---------- */
.footer {
  padding: 2rem var(--gutter);
  max-width: var(--max);
  margin: 0 auto;
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--hairline);
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-mark {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-1);
}
.footer-meta {
  display: flex; align-items: center; gap: 1.5rem;
  font-size: 13px;
  color: var(--text-2);
  font-family: 'Geist Mono', ui-monospace, monospace;
  letter-spacing: 0.02em;
}
.back-top {
  color: var(--text-2);
  transition: color var(--t-fast) var(--ease);
}
.back-top:hover { color: var(--text-1); }

/* ---------- Scroll-reveal (IntersectionObserver-driven) ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--t-slow) var(--ease),
              transform var(--t-slow) var(--ease);
  will-change: opacity, transform;
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------- Mobile collapse rules ---------- */
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-burger { display: inline-flex; }
  .hero {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .principle {
    grid-template-columns: 56px 1fr;
    gap: 1rem;
  }
  .bento {
    grid-template-columns: 1fr !important;
  }
  .bento .bento-cell { grid-column: span 1 !important; }
  .tile img { aspect-ratio: 4 / 3; min-height: 220px; }
}

/* ---------- 五个入口（首页） ---------- */
.entries {
  padding: clamp(2rem, 4vw, 4rem) 0 var(--pad-section);
}
.entries-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}
@media (min-width: 760px) {
  .entries-grid { grid-template-columns: repeat(6, 1fr); }
  .entry-1 { grid-column: span 4; }
  .entry-2 { grid-column: span 2; }
  .entry-3 { grid-column: span 2; }
  .entry-4 { grid-column: span 2; }
  .entry-5 { grid-column: span 2; }
}
.entry {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: clamp(1.5rem, 2.5vw, 2rem);
  min-height: 11rem;
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-tile), var(--glass-hl);
  transition: transform var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
  will-change: transform;
}
.entry:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 38%, transparent);
  box-shadow: 0 30px 60px -30px rgba(20, 22, 26, 0.24),
              0 8px 20px -10px rgba(20, 22, 26, 0.14);
}
.entry-title {
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-1);
}
.entry-1 .entry-title,
.entry-2 .entry-title { font-size: clamp(1.3rem, 2.2vw, 1.6rem); }
.entry-desc {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.65;
  max-width: 42ch;
}
.entry-go {
  margin-top: auto;
  padding-top: 1rem;
  color: var(--accent);
  font-size: 1rem;
  transition: transform var(--t-base) var(--ease);
}
.entry:hover .entry-go { transform: translateX(4px); }

/* ---------- Focus ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* =========================================================
   内页组件（多页结构：页签 / 目录 / 页面头）
   ========================================================= */

/* ---------- 页面容器 ---------- */
.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(7rem, 14vh, 10rem) var(--gutter) clamp(4rem, 8vw, 7rem);
}
.page-head {
  max-width: 46rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-head .display {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  letter-spacing: -0.035em;
}
.page-note {
  font-size: 0.8rem;
  color: var(--text-3);
  font-family: 'Geist Mono', ui-monospace, monospace;
  letter-spacing: 0.02em;
  line-height: 1.8;
}
.back-link {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  transition: border-color var(--t-fast) var(--ease);
}
.back-link:hover { border-color: var(--accent); }

/* ---------- 页签（segmented control） ---------- */
.tablist {
  display: flex;
  gap: 0.25rem;
  padding: 0.35rem;
  background: var(--bg-2);
  border: 1px solid var(--hairline);
  border-radius: var(--r-pill);
  width: max-content;
  max-width: 100%;
  margin-bottom: clamp(2rem, 4vw, 3rem);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.tablist::-webkit-scrollbar { display: none; }
.tab {
  padding: 0.55rem 1.15rem;
  border-radius: var(--r-pill);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
}
.tab:hover { color: var(--text-1); }
.tab[aria-selected="true"] {
  background: var(--card-bg);
  color: var(--text-1);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06), var(--glass-hl);
}
.tab-panel[hidden] { display: none; }
.tab-panel { animation: panelIn var(--t-base) var(--ease) both; }
@keyframes panelIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .tab-panel { animation: none; }
}

/* ---------- 内容列表（页签内通用） ---------- */
.rule-list { display: grid; gap: 0; max-width: 62ch; }
.rule-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--hairline);
}
.rule-item:first-child { border-top: 1px solid var(--hairline); }
.rule-item h3 {
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--text-1);
  margin-bottom: 0.5rem;
}
.rule-item p {
  color: var(--text-2);
  line-height: 1.7;
  font-size: 0.95rem;
}
.rule-item .meta {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.72rem;
  color: var(--text-3);
  font-family: 'Geist Mono', ui-monospace, monospace;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ---------- 占位块（内容待补） ---------- */
.placeholder {
  display: grid;
  gap: 0.6rem;
  padding: clamp(1.75rem, 3vw, 2.5rem);
  border: 1px dashed color-mix(in srgb, var(--text-3) 45%, transparent);
  border-radius: var(--r-card);
  background: color-mix(in srgb, var(--bg-2) 50%, transparent);
  max-width: 54ch;
}
.placeholder-tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-3);
  font-family: 'Geist Mono', ui-monospace, monospace;
}
.placeholder-title {
  display: block;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--text-1);
}
.placeholder-text {
  display: block;
  font-size: 0.92rem;
  color: var(--text-2);
  line-height: 1.7;
}

/* ---------- 目录（杂项） ---------- */
.dir-list {
  display: grid;
  gap: 1rem;
  max-width: 58rem;
}
.dir-item {
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  gap: 1.25rem;
  align-items: center;
  padding: 1.5rem 1.75rem;
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-tile), var(--glass-hl);
  transition: transform var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease);
  will-change: transform;
}
.dir-item:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
}
.dir-index {
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--text-3);
  letter-spacing: 0.05em;
}
/* span 默认为 inline，必须显式转 block，否则不换行且 margin 失效 */
.dir-title {
  display: block;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--text-1);
  margin-bottom: 0.35rem;
}
.dir-desc {
  display: block;
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.6;
  max-width: 46ch;
}
.dir-arrow {
  color: var(--accent);
  transition: transform var(--t-base) var(--ease);
}
.dir-item:hover .dir-arrow { transform: translateX(3px); }
@media (max-width: 640px) {
  .dir-item { grid-template-columns: 2rem 1fr; gap: 0.85rem; padding: 1.25rem; }
  .dir-arrow { display: none; }
}
/* ---------- 导航搜索（独立悬浮控件：默认图标，悬停/聚焦/点击展开） ---------- */
.nav-search {
  position: absolute;
  top: 50%;
  left: calc(100% + 0.75rem);
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-bd);
  border-radius: var(--r-pill);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: var(--glass-hl), 0 8px 24px -12px rgba(0,0,0,0.10);
  transition: border-color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease);
}
.nav-search:hover,
.nav-search.is-open {
  background: var(--card-bg);
  border-color: var(--accent);
}
.search-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  flex-shrink: 0;
  transition: color var(--t-fast) var(--ease);
}
.nav-search:hover .search-toggle,
.nav-search.is-open .search-toggle { color: var(--text-1); }
.search-input {
  width: 0;
  min-width: 0;
  padding: 0;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 0.875rem;
  color: var(--text-1);
  outline: none;
  opacity: 0;
  cursor: pointer;
  transition: width var(--t-base) var(--ease),
              opacity var(--t-fast) var(--ease),
              padding var(--t-base) var(--ease);
}
.nav-search.is-open .search-input {
  width: clamp(110px, 14vw, 180px);
  padding: 0.35rem 0.1rem 0.35rem 0.2rem;
  opacity: 1;
  cursor: text;
}
.search-scope-btn {
  max-width: 0;
  padding: 0;
  overflow: hidden;
  opacity: 0;
  font: inherit;
  font-size: 0.75rem;
  color: var(--text-2);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  cursor: pointer;
  white-space: nowrap;
  transition: max-width var(--t-base) var(--ease),
              opacity var(--t-fast) var(--ease),
              padding var(--t-base) var(--ease),
              border-color var(--t-fast) var(--ease);
}
.nav-search.is-open .search-scope-btn {
  max-width: 4.5rem;
  padding: 0.3rem 0.6rem;
  opacity: 1;
  border-color: var(--hairline);
}
.nav-search.is-open .search-scope-btn:hover {
  color: var(--text-1);
  border-color: var(--accent);
}
.search-pop {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  width: min(26rem, 86vw);
  max-height: 24rem;
  overflow-y: auto;
  padding: 0.5rem;
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
  z-index: 150;
}
/* 宽屏：面板跟控件左缘对齐向右展开 */
@media (min-width: 1200px) {
  .search-pop { left: 0; right: auto; }
}
.search-hit {
  display: grid;
  gap: 0.15rem;
  padding: 0.7rem 0.85rem;
  border-radius: var(--r-sm);
  text-decoration: none;
  transition: background var(--t-fast) var(--ease);
}
.search-hit:hover { background: var(--bg-2); }
.search-hit-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-1);
}
.search-hit-tab {
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--accent);
}
.search-hit-snip {
  font-size: 0.8rem;
  color: var(--text-2);
  line-height: 1.5;
}
.search-empty,
.search-more {
  padding: 0.7rem 0.85rem;
  font-size: 0.8rem;
  color: var(--text-3);
}
/* 中窄屏：浮岛右侧放不下展开宽度，控件挪到浮岛下方右侧，右锚定展开 */
@media (max-width: 1199px) {
  .nav-search {
    left: auto;
    right: 0;
    top: calc(100% + 0.5rem);
    transform: none;
  }
}
@media (max-width: 900px) {
  .nav-inner { flex-wrap: wrap; }
}

/* ---------- 评论组件 ---------- */
.comments {
  margin-top: clamp(3rem, 6vw, 4.5rem);
  padding-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid var(--hairline);
}
.comments-title {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--text-1);
  margin-bottom: 1.5rem;
}
.comments-list { display: grid; gap: 0; margin-bottom: 2rem; }
.comment-item {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--hairline-2);
}
.comment-item:first-child { border-top: 1px solid var(--hairline-2); }
.comment-meta {
  font-size: 0.8rem;
  color: var(--text-3);
  margin-bottom: 0.4rem;
}
.comment-meta strong {
  color: var(--text-1);
  font-weight: 500;
  margin-right: 0.1rem;
}
.comment-text {
  color: var(--text-2);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}
.comments-empty,
.comments-loading {
  font-size: 0.875rem;
  color: var(--text-3);
  padding: 0.75rem 0;
}
.comment-form {
  display: grid;
  gap: 0.75rem;
  max-width: 42rem;
}
.comment-author,
.comment-body {
  font: inherit;
  font-size: 0.9rem;
  color: var(--text-1);
  background: var(--bg-2);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  padding: 0.65rem 0.85rem;
  outline: none;
  transition: border-color var(--t-fast) var(--ease);
}
.comment-author:focus,
.comment-body:focus { border-color: var(--accent); }
.comment-author { width: min(18rem, 100%); }
.comment-body { resize: vertical; min-height: 5.5rem; }
.comment-form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.comment-hint {
  font-size: 0.8rem;
  color: var(--text-3);
}
/* honeypot：对人和屏幕阅读器隐藏，机器人会填 */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}