/* ==========================================================================
   徐梅 · 法律与合规总监 — design system
   white / charcoal / one red · asymmetric 12-col fluid grid · clamp() type
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-2: #f6f5f2;
  --ink: #1c1c1c;
  --ink-70: #4a4a4a;
  --ink-45: #7a7a7a;
  --line: #e4e2dd;
  --line-strong: #cfcdc7;
  --red: #a6192e;
  --red-soft: rgba(166, 25, 46, 0.08);

  --f-cn: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "Noto Serif SC", "SimSun", serif;
  --f-en: "Instrument Serif", "Cormorant Garamond", "Times New Roman", Georgia, serif;
  --f-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --f-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --t-xs: clamp(0.68rem, 0.62rem + 0.25vw, 0.78rem);
  --t-sm: clamp(0.82rem, 0.76rem + 0.3vw, 0.95rem);
  --t-md: clamp(1rem, 0.94rem + 0.3vw, 1.15rem);
  --t-lg: clamp(1.2rem, 1.05rem + 0.8vw, 1.7rem);
  --t-xl: clamp(1.5rem, 1.1rem + 1.8vw, 2.5rem);
  --t-2xl: clamp(2rem, 1.2rem + 3.6vw, 4.6rem);
  --t-display: clamp(3rem, 1.4rem + 7.5vw, 8.5rem);

  --gutter: clamp(14px, 1.6vw, 32px);
  --margin: clamp(20px, 5vw, 104px);
  --maxw: 1680px;

  --s-1: clamp(0.5rem, 0.4rem + 0.5vw, 1rem);
  --s-2: clamp(1rem, 0.8rem + 1vw, 2rem);
  --s-3: clamp(2rem, 1.4rem + 2.5vw, 4rem);
  --s-4: clamp(3.5rem, 2.2rem + 5vw, 8rem);
  --s-5: clamp(5rem, 3.5rem + 8vw, 12rem);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--ink);
  font-family: var(--f-body); font-size: var(--t-md); line-height: 1.7;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; text-align: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
em { font-style: normal; }
::selection { background: var(--red); color: #fff; }

.mono { font-family: var(--f-mono); font-size: var(--t-xs); letter-spacing: 0.08em; text-transform: uppercase; }
.serif-en { font-family: var(--f-en); font-weight: 400; }

/* ---------- reveal states (only with JS + GSAP) ---------- */
html.js .reveal, html.js .reveal-stagger > li { opacity: 0; transform: translate3d(0, 18px, 0); }
html.js [data-split] { visibility: hidden; }
html.js [data-split].is-split { visibility: visible; }
.line { display: block; overflow: hidden; }
.word { display: inline-block; white-space: nowrap; }
.char { display: inline-block; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: clamp(14px, 1.6vw, 22px) var(--margin);
  background: rgba(255, 255, 255, 0.86); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__brand { display: inline-flex; align-items: center; gap: 12px; }
.nav__mark {
  width: 28px; height: 28px; display: grid; place-items: center;
  font-family: var(--f-cn); font-weight: 700; font-size: 16px; line-height: 1;
  color: #fff; background: var(--red); border-radius: 2px;
}
.nav__name { font-family: var(--f-cn); font-size: var(--t-sm); letter-spacing: .2em; font-weight: 600; }
.nav__name em { font-family: var(--f-en); font-style: italic; letter-spacing: .02em; color: var(--ink-45); margin-left: 8px; font-weight: 400; }
.nav__links { display: flex; gap: clamp(16px, 2.6vw, 44px); font-size: var(--t-sm); }
.nav__links a { position: relative; padding: 4px 0; color: var(--ink-70); transition: color .3s; }
.nav__links a::after { content: ""; position: absolute; left: 0; bottom: 0; width: 100%; height: 1px; background: var(--red); transform: scaleX(0); transform-origin: 0 50%; transition: transform .45s var(--ease-out); }
.nav__links a:hover { color: var(--ink); }
.nav__links a:hover::after { transform: scaleX(1); }

/* ---------- section primitives ---------- */
section { position: relative; padding-inline: var(--margin); max-width: var(--maxw); margin-inline: auto; }
.section-head {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter);
  align-items: end; padding-top: var(--s-4); padding-bottom: var(--s-3);
  border-top: 1px solid var(--line-strong);
}
.section-head__no { grid-column: 1 / 2; color: var(--red); align-self: start; padding-top: .4em; }
.section-head__title { grid-column: 2 / 8; font-family: var(--f-cn); font-weight: 600; font-size: var(--t-2xl); line-height: 1.05; letter-spacing: .02em; }
.section-head__desc { grid-column: 8 / 13; font-size: var(--t-md); line-height: 1.8; color: var(--ink-70); max-width: 40ch; }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  min-height: calc(100svh - 64px); display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter);
  grid-template-rows: auto auto 1fr auto;
  padding-top: clamp(56px, 10vh, 140px); padding-bottom: var(--s-4);
}
.hero__eyebrow { grid-column: 1 / 9; grid-row: 1; color: var(--ink-70); }
.hero__eyebrow .sep { color: var(--red); margin: 0 .5em; }
.hero__title {
  grid-column: 1 / 8; grid-row: 2; margin-top: var(--s-2);
  font-family: var(--f-cn); font-weight: 600; font-size: var(--t-display); line-height: 1; letter-spacing: .06em;
}
.hero__intro {
  grid-column: 7 / 13; grid-row: 2 / 4; align-self: end; margin-top: var(--s-3);
  display: flex; flex-direction: column; gap: 1em;
  font-size: var(--t-md); line-height: 1.85; color: var(--ink-70); max-width: 44ch;
}
.hero__stats {
  grid-column: 1 / 13; grid-row: 4; margin-top: var(--s-4);
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); column-gap: var(--gutter);
  border-top: 1px solid var(--line-strong); padding-top: var(--s-2);
}
.hero__stats li { display: flex; gap: .6em; align-items: baseline; padding-right: var(--gutter); }
.hero__stats li + li { padding-left: var(--gutter); border-left: 1px solid var(--line); }
.hero__stats strong { font-family: var(--f-en); font-weight: 400; font-size: var(--t-2xl); line-height: .9; letter-spacing: -.01em; font-variant-numeric: tabular-nums; }
.hero__stats b { font-family: var(--f-en); font-weight: 400; font-size: var(--t-xl); color: var(--red); margin-left: -.3em; }
.hero__stats span { font-size: var(--t-sm); line-height: 1.5; color: var(--ink-70); }
.hero__stats small { display: block; margin-top: .4em; color: var(--ink-45); text-transform: none; letter-spacing: .04em; }

/* ==========================================================================
   APPROACH
   ========================================================================== */
.principles { padding-bottom: var(--s-4); }
.principle {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter);
  padding: var(--s-3) 0; border-top: 1px solid var(--line);
}
.principle__no { grid-column: 1 / 3; font-size: var(--t-2xl); line-height: .9; color: var(--red); }
.principle__title { grid-column: 3 / 9; font-family: var(--f-cn); font-weight: 600; font-size: var(--t-xl); line-height: 1.25; letter-spacing: .02em; }
.principle__body { grid-column: 9 / 13; color: var(--ink-70); font-size: var(--t-md); line-height: 1.85; }
.principle__proof {
  grid-column: 3 / 9; margin-top: var(--s-2); display: flex; flex-wrap: wrap; gap: 8px 10px;
  text-transform: none; letter-spacing: .04em; color: var(--ink-70);
}
.principle__proof li { padding: 5px 10px; border: 1px solid var(--line-strong); border-radius: 2px; }

/* ==========================================================================
   EXPERIENCE
   ========================================================================== */
.dossiers { padding-bottom: var(--s-4); }
.dossier { border-top: 1px solid var(--line); position: relative; }
.dossier:last-child { border-bottom: 1px solid var(--line); }
.dossier__head {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter);
  width: 100%; padding: var(--s-3) 0; position: relative;
}
.dossier__head::before {
  content: ""; position: absolute; left: calc(-1 * var(--margin)); right: calc(-1 * var(--margin)); top: 0; bottom: 0;
  background: var(--bg-2); opacity: 0; transition: opacity .4s;
}
@media (hover: hover) { .dossier__head:hover::before { opacity: 1; } }
.dossier.is-open .dossier__head::before { opacity: 1; }
.dossier__head > * { position: relative; z-index: 1; }
.dossier__no { grid-column: 1 / 2; grid-row: 1 / 3; font-size: var(--t-2xl); line-height: .9; color: var(--red); }
.dossier__meta { grid-column: 2 / 3; grid-row: 1; display: flex; flex-direction: column; gap: .3em; color: var(--ink-70); padding-top: .4em; }
.dossier__meta span + span { color: var(--ink-45); letter-spacing: .06em; }
.dossier__title { grid-column: 3 / 10; grid-row: 1; font-family: var(--f-cn); font-weight: 600; font-size: var(--t-xl); line-height: 1.3; letter-spacing: .01em; }
.dossier__lede { grid-column: 3 / 9; grid-row: 2; margin-top: var(--s-2); color: var(--ink-70); font-size: var(--t-sm); line-height: 1.8; }
.dossier__metric { grid-column: 10 / 13; grid-row: 1; justify-self: end; text-align: right; display: flex; align-items: baseline; gap: .25em; }
.dossier__metric strong { font-family: var(--f-en); font-weight: 400; font-size: var(--t-2xl); line-height: .9; }
.dossier__metric b { font-family: var(--f-en); font-weight: 400; font-size: var(--t-xl); color: var(--red); margin-left: -.25em; }
.dossier__metric small { display: block; font-size: var(--t-xs); color: var(--ink-70); max-width: 14ch; line-height: 1.45; text-align: left; margin-left: .5em; }
.dossier__arenas { grid-column: 10 / 12; grid-row: 2; margin-top: var(--s-2); justify-self: end; color: var(--ink-45); text-transform: none; letter-spacing: .06em; }
.dossier__toggle {
  grid-column: 12 / 13; grid-row: 2; justify-self: end; align-self: end;
  width: 40px; height: 40px; border: 1px solid var(--line-strong); border-radius: 50%;
  transition: transform .5s var(--ease-out), border-color .3s, background-color .3s;
}
.dossier__toggle i { position: absolute; left: 50%; top: 50%; width: 12px; height: 1px; background: var(--ink); transform: translate(-50%, -50%); }
.dossier__toggle i + i { transform: translate(-50%, -50%) rotate(90deg); }
.dossier.is-open .dossier__toggle { background: var(--ink); border-color: var(--ink); transform: rotate(135deg); }
.dossier.is-open .dossier__toggle i { background: #fff; }

.dossier__body { overflow: hidden; }
.dossier__body[hidden] { display: none; }
.dossier__inner { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); padding: 0 0 var(--s-3); }
.logic { grid-column: 3 / 13; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); column-gap: var(--gutter); counter-reset: step; }
.logic li { position: relative; padding-top: var(--s-2); border-top: 1px solid var(--ink); }
.logic li::before { counter-increment: step; content: counter(step, decimal-leading-zero); position: absolute; right: 0; top: var(--s-1); font-family: var(--f-en); font-size: var(--t-lg); line-height: 1; color: var(--ink-45); }
.logic em { display: block; color: var(--red); margin-bottom: .9em; }
.logic p { font-size: var(--t-sm); line-height: 1.8; color: var(--ink-70); }
.tags { grid-column: 3 / 13; margin-top: var(--s-3); display: flex; flex-wrap: wrap; gap: 8px; text-transform: none; letter-spacing: .04em; color: var(--ink-70); }
.tags li { padding: 5px 10px; border: 1px solid var(--line-strong); border-radius: 2px; background: var(--bg); }

/* ==========================================================================
   MAP
   ========================================================================== */
.matrix { background: var(--bg-2); max-width: none; padding-bottom: var(--s-4); }
.matrix > * { max-width: calc(var(--maxw) - 2 * var(--margin)); margin-inline: auto; }
.matrix .section-head { border-top: 0; }
.grid-wrap { padding-bottom: var(--s-3); }
.grid { display: grid; grid-template-columns: minmax(170px, 1.8fr) repeat(6, minmax(72px, 1fr)); border-top: 1px solid var(--ink); }
.grid__row { display: contents; }
.grid__corner, .grid__col, .grid__label, .cell { border-bottom: 1px solid var(--line-strong); padding: clamp(14px, 1.6vw, 24px) 0; }
.grid__corner { color: var(--ink-45); }
.grid__col { text-align: center; color: var(--ink-70); position: relative; transition: color .3s; }
.grid__col::after { content: ""; position: absolute; left: 50%; bottom: -1px; width: 0; height: 2px; background: var(--red); transform: translateX(-50%); transition: width .45s var(--ease-out); }
.grid__col:hover, .grid__col.is-active { color: var(--ink); }
.grid__col.is-active::after { width: 100%; }
.grid__label { font-family: var(--f-cn); font-weight: 600; font-size: var(--t-md); display: flex; align-items: center; gap: 14px; }
.grid__label .serif-en { font-size: var(--t-lg); color: var(--ink-45); line-height: 1; }
.cell { display: grid; place-items: center; }
.cell i { width: 10px; height: 10px; border-radius: 50%; border: 1px solid var(--line-strong); transition: transform .4s var(--ease-out), opacity .3s; }
.cell.on i { background: var(--red); border-color: var(--red); }
.cell.on:hover i { transform: scale(1.8); }
.grid.is-filtered .cell:not(.is-col) i, .grid.is-filtered .grid__col:not(.is-active) { opacity: .25; }
.grid.is-filtered .grid__label { opacity: .4; }
.grid.is-filtered .grid__row.has-col .grid__label { opacity: 1; }
.grid__note { margin-top: var(--s-2); color: var(--ink-45); min-height: 1.6em; text-transform: none; letter-spacing: .06em; transition: color .3s; }
.grid__note.is-live { color: var(--ink); }

.regulators { padding: var(--s-3) 0; border-top: 1px solid var(--line-strong); }
.regulators h3 { color: var(--red); margin-bottom: var(--s-2); }
.regulators ul { display: flex; flex-wrap: wrap; gap: 10px 28px; }
.regulators li { font-family: var(--f-cn); font-size: var(--t-lg); font-weight: 600; letter-spacing: .02em; color: var(--ink); }

.creds { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); padding-top: var(--s-3); border-top: 1px solid var(--line-strong); }
.creds__col:first-child { grid-column: 1 / 7; }
.creds__col:last-child { grid-column: 7 / 13; }
.creds h3 { color: var(--red); margin-bottom: var(--s-1); }
.creds ul + h3 { margin-top: var(--s-3); }
.creds li { display: flex; flex-direction: column; gap: .15em; padding: var(--s-1) 0; border-top: 1px solid var(--line); }
.creds strong { font-family: var(--f-cn); font-weight: 600; font-size: var(--t-md); }
.creds span { font-size: var(--t-sm); color: var(--ink-70); }

/* ==========================================================================
   CONTACT
   ========================================================================== */
.contact {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter);
  padding-top: var(--s-4); padding-bottom: var(--s-5);
}
.contact .section-head__no { grid-column: 1 / 2; padding-top: .4em; }
.contact__title { grid-column: 2 / 8; font-family: var(--f-cn); font-weight: 600; font-size: var(--t-2xl); line-height: 1.05; letter-spacing: .02em; }
.contact__sub { grid-column: 2 / 8; margin-top: var(--s-2); color: var(--ink-70); line-height: 1.85; max-width: 40ch; }
.contact__mail { grid-column: 2 / 8; margin-top: var(--s-3); font-family: var(--f-en); font-size: var(--t-xl); line-height: 1.1; width: max-content; max-width: 100%; border-bottom: 1px solid var(--ink); padding-bottom: 4px; transition: color .3s, border-color .3s; }
.contact__mail:hover { color: var(--red); border-color: var(--red); }
.contact__copy { grid-column: 2 / 6; margin-top: var(--s-2); width: max-content; padding: 9px 14px; border: 1px solid var(--line-strong); border-radius: 2px; color: var(--ink-70); transition: color .3s, border-color .3s; }
.contact__copy:hover, .contact__copy.is-done { color: var(--ink); border-color: var(--ink); }

/* ---------- footer ---------- */
.foot {
  display: flex; justify-content: space-between; gap: var(--s-2); flex-wrap: wrap;
  padding: var(--s-2) var(--margin) calc(var(--s-2) + env(safe-area-inset-bottom)); max-width: var(--maxw); margin-inline: auto;
  border-top: 1px solid var(--line-strong); color: var(--ink-45);
}
.foot a:hover { color: var(--ink); }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1100px) {
  .section-head__no { grid-column: 1 / 2; grid-row: 1; margin-bottom: var(--s-1); }
  .section-head__title { grid-column: 1 / 10; grid-row: 2; }
  .section-head__desc { grid-row: 3; grid-column: 1 / 10; margin-top: var(--s-2); }
  .hero__title { grid-column: 1 / 13; }
  .hero__intro { grid-column: 1 / 11; grid-row: 3; margin-top: var(--s-3); }
  .principle__no { grid-column: 1 / 13; margin-bottom: var(--s-1); }
  .principle__title { grid-column: 1 / 10; }
  .principle__body { grid-column: 1 / 11; margin-top: var(--s-2); }
  .principle__proof { grid-column: 1 / 13; }
  .dossier__no { grid-column: 1 / 3; grid-row: 1; }
  .dossier__meta { grid-column: 3 / 9; grid-row: 1; }
  .dossier__metric { grid-column: 9 / 13; grid-row: 1; }
  .dossier__title { grid-column: 1 / 11; grid-row: 2; margin-top: var(--s-2); }
  .dossier__lede { grid-column: 1 / 11; grid-row: 3; }
  .dossier__arenas { grid-column: 1 / 9; grid-row: 4; justify-self: start; }
  .dossier__toggle { grid-column: 11 / 13; grid-row: 3 / 5; }
  .logic { grid-column: 1 / 13; grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: var(--s-2); }
  .tags { grid-column: 1 / 13; }
}

@media (max-width: 720px) {
  .nav { padding: 12px 20px; }
  .nav__name em { display: none; }
  .nav__links { gap: 14px; font-size: var(--t-xs); }
  .hero { grid-template-rows: auto auto auto auto; padding-top: var(--s-4); }
  .hero__eyebrow { grid-column: 1 / 13; }
  .hero__intro { grid-column: 1 / 13; }
  .hero__stats { grid-column: 1 / 13; grid-template-columns: 1fr; row-gap: var(--s-2); }
  .hero__stats li + li { padding-left: 0; border-left: 0; padding-top: var(--s-2); border-top: 1px solid var(--line); }
  .section-head__title, .section-head__desc { grid-column: 1 / 13; }
  .principle__title, .principle__body { grid-column: 1 / 13; }
  .dossier__head { padding: var(--s-2) 0; }
  .dossier__no { grid-column: 1 / 4; }
  .dossier__meta { grid-column: 4 / 13; }
  .dossier__metric { grid-column: 1 / 13; grid-row: 5; justify-self: start; text-align: left; margin-top: var(--s-2); }
  .dossier__metric small { max-width: none; }
  .dossier__title, .dossier__lede { grid-column: 1 / 13; }
  .dossier__arenas { grid-column: 1 / 10; grid-row: 4; }
  .dossier__toggle { grid-column: 10 / 13; grid-row: 4 / 6; align-self: center; }
  .logic { grid-template-columns: 1fr; }
  .logic li::before { position: static; display: block; margin-bottom: .4em; }
  .grid-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-inline: calc(-1 * var(--margin)); padding-inline: var(--margin); }
  .grid { min-width: 660px; grid-template-columns: 150px repeat(6, 84px); }
  .grid__corner, .grid__label { position: sticky; left: 0; background: var(--bg-2); z-index: 1; padding-right: 10px; }
  .grid__label { font-size: var(--t-sm); gap: 8px; }
  .grid__note { position: sticky; left: 0; }
  .regulators li { font-size: var(--t-md); }
  .creds { row-gap: var(--s-3); }
  .creds__col:first-child, .creds__col:last-child { grid-column: 1 / 13; }
  .contact__title, .contact__sub, .contact__mail, .contact__copy { grid-column: 1 / 13; }
  .contact__mail { font-size: var(--t-lg); word-break: break-all; }
}

@media (prefers-reduced-motion: reduce) {
  html.js .reveal, html.js .reveal-stagger > li { opacity: 1; transform: none; }
  html.js [data-split] { visibility: visible; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}