/* ===========================================================
   DigiIP.cn — Design System
   文化稳重 × 高端商务 × 未来生态生命感
   Palette: 宣纸 / 墨 / 朱砂 / 靛蓝
   =========================================================== */

/* ---------- Tokens ---------- */
:root{
  /* surface */
  --paper:        #FBFAF7;
  --paper-2:      #F4F1EA;
  --paper-3:      #EDE8DE;
  --white:        #FFFFFF;

  /* ink */
  --ink:          #0E0F13;
  --ink-2:        #2C2F38;
  --ink-3:        #54585F;
  --muted:        #85898F;
  --line:         #E2DED4;
  --line-2:       #CFC9BB;

  /* brand A — 朱砂 Vermilion */
  --zhu:          #D8402F;
  --zhu-dark:     #B22F21;
  --zhu-soft:     #F7E3DF;
  --zhu-glow:     rgba(216,64,47,.14);

  /* brand B — 靛蓝 Indigo */
  --dian:         #23305E;
  --dian-dark:    #16203F;
  --dian-soft:    #E2E6F0;
  --dian-glow:    rgba(35,48,94,.12);

  /* accent — 鎏金 */
  --gold:         #B08C4A;
  --gold-soft:    #F0E6D0;

  /* type */
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", Roboto,
          "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --serif: var(--sans);
  --mono:  var(--sans);

  /* rhythm */
  --gut: 24px;
  --maxw: 1240px;
  --sec-y: clamp(80px, 10vw, 148px);

  /* motion */
  --ease: cubic-bezier(.22,.61,.36,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
  --r-s: 4px;
  --r-m: 10px;
  --r-l: 18px;
  --r-xl: 26px;

  /* shadow */
  --sh-1: 0 1px 2px rgba(14,15,19,.04), 0 6px 20px -12px rgba(14,15,19,.12);
  --sh-2: 0 2px 4px rgba(14,15,19,.04), 0 18px 48px -24px rgba(14,15,19,.22);
  --sh-3: 0 40px 90px -40px rgba(14,15,19,.34);
}

/* ---------- Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){ html{ scroll-behavior:auto; } }
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.72;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{ display:block; max-width:100%; height:auto; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; color:inherit; background:none; border:0; cursor:pointer; }
h1,h2,h3,h4,h5{ margin:0; font-weight:600; letter-spacing:-.01em; line-height:1.18; }
p{ margin:0; }
ul,ol{ margin:0; padding:0; list-style:none; }
::selection{ background:var(--zhu); color:#fff; }

/* paper grain */
body::before{
  content:"";
  position:fixed; inset:0; z-index:9999; pointer-events:none;
  opacity:.035; mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Layout ---------- */
.container{ width:100%; max-width:var(--maxw); margin-inline:auto; padding-inline:clamp(20px,4vw,48px); }
.container-wide{ max-width:1480px; }
.section{ padding-block:var(--sec-y); position:relative; }
.section--tight{ padding-block:clamp(56px,7vw,96px); }
.grid{ display:grid; gap:var(--gut); }
.g-2{ grid-template-columns:repeat(2,1fr); }
.g-3{ grid-template-columns:repeat(3,1fr); }
.g-4{ grid-template-columns:repeat(4,1fr); }
.g-6{ grid-template-columns:repeat(6,1fr); }
@media (max-width:980px){
  .g-3,.g-4{ grid-template-columns:repeat(2,1fr); }
  .g-6{ grid-template-columns:repeat(3,1fr); }
}
@media (max-width:640px){
  .g-2,.g-3,.g-4{ grid-template-columns:1fr; }
  .g-6{ grid-template-columns:repeat(2,1fr); }
}

/* ---------- Type scale ---------- */
.eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  font-size:11.5px; font-weight:600; letter-spacing:.2em; text-transform:uppercase;
  color:var(--zhu); margin-bottom:22px;
}
.eyebrow::before{
  content:""; width:26px; height:1px; background:var(--zhu); opacity:.6;
}
.eyebrow--light{ color:#BFB6A2; }
.eyebrow--light::before{ background:#BFB6A2; }

.display{
  font-weight:600;
  font-size:clamp(38px,6.4vw,84px); line-height:1.14; letter-spacing:-.012em;
}
.h1{ font-weight:600; font-size:clamp(34px,5vw,62px); line-height:1.18; letter-spacing:-.012em; }
.h2{ font-weight:600; font-size:clamp(28px,3.4vw,44px); line-height:1.26; letter-spacing:-.01em; }
.h3{ font-size:clamp(19px,2vw,23px); font-weight:600; line-height:1.35; letter-spacing:-.008em; }
.h4{ font-size:17px; font-weight:600; line-height:1.4; }
.lead{ font-size:clamp(16.5px,1.5vw,19.5px); line-height:1.78; color:var(--ink-2); }
.body{ color:var(--ink-3); line-height:1.82; }
.small{ font-size:14px; line-height:1.7; color:var(--muted); }
.mono{ font-size:11.5px; font-weight:600; letter-spacing:.14em; text-transform:uppercase; }
.num{ color:var(--zhu); font-size:13px; font-weight:600; letter-spacing:.08em; }

.hl-z{ color:var(--zhu); }
.hl-d{ color:var(--dian); }
.italic{ font-style:normal; color:var(--ink-3); }

.section-head{ max-width:820px; margin-bottom:clamp(40px,5vw,68px); }
.section-head.center{ margin-inline:auto; text-align:center; }
.section-head .lead{ margin-top:22px; }

/* ---------- Surfaces ---------- */
.dark{
  background:var(--ink); color:#F2F0EA;
  --line: rgba(255,255,255,.12);
}
.dark .lead{ color:rgba(242,240,234,.72); }
.dark .body{ color:rgba(242,240,234,.62); }
.dark .small{ color:rgba(242,240,234,.5); }
.dark .h2,.dark .h1,.dark .display{ color:#FCFBF8; }
.dark .muted{ color:rgba(242,240,234,.55); }
.dian-bg{ background:var(--dian); color:#EDEFF5; --line:rgba(255,255,255,.14); }
.dian-bg .lead{ color:rgba(237,239,245,.72); }
.dian-bg .body{ color:rgba(237,239,245,.6); }
.dian-bg .h2,.dian-bg .h1,.dian-bg .display{ color:#fff; }
.paper-2{ background:var(--paper-2); }

.rule{ height:1px; background:var(--line); border:0; margin:0; }

/* ---------- Nav ---------- */
.progress{
  position:fixed; top:0; left:0; height:2px; width:0%;
  background:linear-gradient(90deg,var(--zhu),#E8846B);
  z-index:1001; transition:width .1s linear;
}
.nav{
  position:fixed; top:0; left:0; right:0; z-index:1000;
  transition:background .45s var(--ease), backdrop-filter .45s, border-color .45s, padding .45s var(--ease);
  border-bottom:1px solid transparent;
  padding-block:18px;
}
.nav.invert{
  background:rgba(14,15,19,.86); backdrop-filter:saturate(160%) blur(18px);
  -webkit-backdrop-filter:saturate(160%) blur(18px);
  border-bottom-color:rgba(255,255,255,.09);
  padding-block:11px;
}
.nav.solid{
  background:rgba(251,250,247,.86); backdrop-filter:saturate(160%) blur(18px);
  -webkit-backdrop-filter:saturate(160%) blur(18px);
  border-bottom-color:var(--line);
  padding-block:11px;
}
.nav-inner{ display:flex; align-items:center; gap:32px; justify-content:space-between; }
.brand{ display:flex; align-items:baseline; gap:9px; flex-shrink:0; }
.brand-mark{
  font-size:23px; font-weight:700; letter-spacing:-.01em;
  line-height:1; color:var(--ink);
}
.brand-mark em{ font-style:normal; color:var(--zhu); }
.brand-sub{ font-size:10px; font-weight:600; letter-spacing:.18em; color:var(--muted); text-transform:uppercase; }
.burger{ display:none; width:40px; height:40px; place-items:center; border:1px solid var(--line); border-radius:var(--r-s); }

.menu{ display:flex; align-items:center; gap:4px; }
.menu a{
  position:relative; padding:8px 13px; font-size:14.5px; font-weight:500;
  color:var(--ink-2); border-radius:var(--r-s); transition:color .3s, background .3s;
}
.menu a::after{
  content:""; position:absolute; left:13px; right:13px; bottom:2px; height:1px;
  background:var(--zhu); transform:scaleX(0); transform-origin:left;
  transition:transform .4s var(--ease-out);
}
.menu a:hover{ color:var(--ink); }
.menu a:hover::after,.menu a.active::after{ transform:scaleX(1); }
.menu a.active{ color:var(--zhu); }
.nav-cta{ display:flex; align-items:center; gap:10px; flex-shrink:0; }

/* invert nav states */
.nav.invert{ color:#F2F0EA; }
.nav.invert .brand-mark{ color:#FCFBF8; }
.nav.invert .brand-sub{ color:rgba(242,240,234,.5); }
.nav.invert .menu a{ color:rgba(242,240,234,.78); }
.nav.invert .menu a:hover{ color:#fff; }
.nav.invert .menu a.active{ color:#E8846B; }
.nav.invert .burger{ border-color:rgba(255,255,255,.2); }
.nav.invert .burger span{ background:#F2F0EA; }
.burger span{ display:block; width:17px; height:1.5px; background:var(--ink); transition:.35s var(--ease); }
.burger span+span{ margin-top:4px; }
.nav-open .burger span:nth-child(1){ transform:translateY(5.5px) rotate(45deg); }
.nav-open .burger span:nth-child(2){ opacity:0; }
.nav-open .burger span:nth-child(3){ transform:translateY(-5.5px) rotate(-45deg); }

@media (max-width:1080px){
  .menu,.nav-cta{ display:none; }
  .nav.nav-open .menu{
    display:flex; flex-direction:column; align-items:stretch; gap:2px;
    position:absolute; top:100%; left:0; right:0; padding:14px 20px 22px;
    background:var(--paper); border-bottom:1px solid var(--line); box-shadow:var(--sh-2);
  }
  .nav.nav-open.invert .menu{ background:rgba(14,15,19,.97); border-bottom-color:rgba(255,255,255,.1); }
  .nav.nav-open .menu a{ padding:12px 4px; font-size:16px; border-bottom:1px solid var(--line); border-radius:0; }
  .nav.nav-open .menu a::after{ display:none; }
  .burger{ display:grid; }
  .nav-inner{ min-height:40px; }
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:9px;
  padding:13px 24px; border-radius:100px; font-size:14.5px; font-weight:500;
  transition:.4s var(--ease-out); white-space:nowrap; position:relative; overflow:hidden;
}
.btn svg{ transition:transform .4s var(--ease-out); }
.btn:hover svg{ transform:translateX(4px); }
.btn-primary{ background:var(--zhu); color:#fff; box-shadow:0 10px 30px -14px var(--zhu); }
.btn-primary:hover{ background:var(--zhu-dark); transform:translateY(-2px); box-shadow:0 18px 40px -16px var(--zhu); }
.btn-dark{ background:var(--ink); color:#fff; }
.btn-dark:hover{ transform:translateY(-2px); box-shadow:var(--sh-2); }
.btn-outline{ border:1px solid var(--line-2); color:var(--ink); }
.btn-outline:hover{ border-color:var(--ink); background:var(--ink); color:#fff; transform:translateY(-2px); }
.btn-ghost{ border:1px solid rgba(255,255,255,.24); color:#F2F0EA; }
.btn-ghost:hover{ background:#fff; color:var(--ink); border-color:#fff; }
.btn-sm{ padding:9px 17px; font-size:13px; }
.btn-arrow::after{ content:"→"; transition:transform .4s var(--ease-out); }
.btn-arrow:hover::after{ transform:translateX(4px); }

/* ---------- Hero ---------- */
.hero{
  position:relative; min-height:100svh; display:flex; align-items:center;
  padding-top:120px; padding-bottom:80px; overflow:hidden;
  background:var(--paper);
}
.hero--dark{ background:var(--ink); color:#F2F0EA; }
.hero-bg{ position:absolute; inset:0; z-index:0; overflow:hidden; }
.orb{
  position:absolute; border-radius:50%; filter:blur(70px); opacity:.5;
  animation:float 22s ease-in-out infinite;
}
@keyframes float{
  0%,100%{ transform:translate3d(0,0,0) scale(1); }
  33%{ transform:translate3d(38px,-30px,0) scale(1.08); }
  66%{ transform:translate3d(-26px,24px,0) scale(.95); }
}
.grid-lines{
  position:absolute; inset:0;
  background-image:linear-gradient(to right,var(--line) 1px,transparent 1px),
                   linear-gradient(to bottom,var(--line) 1px,transparent 1px);
  background-size:78px 78px; opacity:.5;
  mask-image:radial-gradient(ellipse 100% 65% at 50% 40%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse 100% 65% at 50% 40%,#000 20%,transparent 78%);
}
.dark .grid-lines{ background-image:linear-gradient(to right,rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(to bottom,rgba(255,255,255,.07) 1px,transparent 1px); }
.hero-inner{ position:relative; z-index:2; }
.hero-title{ margin-bottom:30px; }
.hero-title .line{ display:block; overflow:hidden; padding-bottom:.1em; margin-bottom:-.1em; }
.hero-title .line>span{
  display:block; transform:translateY(104%);
  animation:riseIn 1.15s var(--ease-out) forwards;
}
.hero-title .line:nth-child(2)>span{ animation-delay:.1s; }
.hero-title .line:nth-child(3)>span{ animation-delay:.2s; }
@keyframes riseIn{ to{ transform:translateY(0); } }
.hero-sub{ max-width:660px; font-size:clamp(16px,1.6vw,20px); line-height:1.8; color:var(--ink-3); }
.dark .hero-sub{ color:rgba(242,240,234,.72); }
.hero-actions{ display:flex; flex-wrap:wrap; gap:12px; margin-top:40px; }

.keyword-row{
  display:flex; flex-wrap:wrap; gap:8px; margin-top:clamp(44px,6vw,72px);
  padding-top:26px; border-top:1px solid var(--line);
}
.dark .keyword-row{ border-top-color:rgba(255,255,255,.12); }
.kw{
  font-size:12.5px; letter-spacing:.03em; padding:6px 13px; border-radius:100px;
  border:1px solid var(--line); color:var(--ink-3); background:rgba(255,255,255,.5);
  transition:.35s var(--ease-out);
}
.dark .kw{ border-color:rgba(255,255,255,.14); color:rgba(242,240,234,.66); background:rgba(255,255,255,.03); }
.kw:hover{ border-color:var(--zhu); color:var(--zhu); transform:translateY(-2px); }

.scroll-hint{
  position:absolute; bottom:30px; left:50%; transform:translateX(-50%);
  z-index:3; display:flex; flex-direction:column; align-items:center; gap:8px;
  font-size:10px; font-weight:600; letter-spacing:.24em; color:var(--muted); opacity:.7;
}
.scroll-hint i{ display:block; width:1px; height:34px; background:linear-gradient(var(--line-2),transparent); position:relative; overflow:hidden; }
.scroll-hint i::after{ content:""; position:absolute; inset:0; background:var(--zhu); animation:drop 2.2s var(--ease) infinite; }
@keyframes drop{ 0%{ transform:translateY(-100%); } 60%,100%{ transform:translateY(100%); } }
@media (max-width:820px){ .scroll-hint{ display:none; } }

/* hero stat bar */
.hero-stats{
  display:grid; grid-template-columns:repeat(4,1fr); gap:1px;
  margin-top:clamp(48px,6vw,80px); background:var(--line); border:1px solid var(--line);
}
.dark .hero-stats{ background:rgba(255,255,255,.1); border-color:rgba(255,255,255,.1); }
.hero-stat{ background:var(--paper); padding:22px 20px; }
.dark .hero-stat{ background:var(--ink); }
.hero-stat b{ display:block; font-size:clamp(24px,2.6vw,34px); font-weight:600; line-height:1.1; letter-spacing:-.01em; }
.hero-stat b em{ font-style:normal; font-size:.55em; color:var(--zhu); margin-left:2px; }
.hero-stat span{ display:block; margin-top:8px; font-size:12.5px; color:var(--muted); letter-spacing:.02em; }
@media (max-width:640px){ .hero-stats{ grid-template-columns:repeat(2,1fr); } }

/* ---------- Reveal ---------- */
.reveal{ opacity:0; transform:translateY(26px); transition:opacity .9s var(--ease-out), transform .9s var(--ease-out); transition-delay:var(--d,0s); }
.reveal.in{ opacity:1; transform:none; }
.reveal-line{ transform:scaleX(0); transform-origin:left; transition:transform 1.1s var(--ease-out); transition-delay:var(--d,0s); }
.reveal-line.in{ transform:scaleX(1); }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1; transform:none; transition:none; }
  .reveal-line{ transform:scaleX(1); }
  .orb{ animation:none; }
}

/* ---------- Card ---------- */
.card{
  position:relative; background:var(--white); border:1px solid var(--line);
  border-radius:var(--r-m); padding:clamp(24px,2.6vw,34px);
  transition:.55s var(--ease-out); overflow:hidden;
}
.card::after{
  content:""; position:absolute; left:0; top:0; height:2px; width:100%;
  background:linear-gradient(90deg,var(--zhu),transparent 72%);
  transform:scaleX(0); transform-origin:left; transition:transform .6s var(--ease-out);
}
.card:hover{ transform:translateY(-5px); box-shadow:var(--sh-2); border-color:var(--line-2); }
.card:hover::after{ transform:scaleX(1); }
.card-ico{ width:38px; height:38px; margin-bottom:20px; color:var(--zhu); }
.card-ico svg{ width:100%; height:100%; }
.card p{ margin-top:12px; font-size:14.5px; line-height:1.75; color:var(--ink-3); }
.card-index{
  position:absolute; top:22px; right:26px;
  font-size:13px; font-weight:600; color:var(--line-2); letter-spacing:.06em;
}

.card-dark{ background:rgba(255,255,255,.035); border-color:rgba(255,255,255,.1); }
.card-dark:hover{ background:rgba(255,255,255,.06); border-color:rgba(255,255,255,.2); box-shadow:none; }
.card-dark p{ color:rgba(242,240,234,.6); }
.card-dark .card-index{ color:rgba(255,255,255,.24); }

.card-flat{ background:transparent; border:0; border-top:1px solid var(--line); border-radius:0; padding:26px 0; }
.card-flat:hover{ transform:none; box-shadow:none; background:transparent; }
.card-flat::after{ display:none; }
.card-flat:hover .h3{ color:var(--zhu); }

/* ---------- Capability (8 abilities) ---------- */
.caps{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line); border:1px solid var(--line); }
.dark .caps{ background:rgba(255,255,255,.1); border-color:rgba(255,255,255,.1); }
.cap{ background:var(--paper); padding:clamp(22px,2.4vw,32px) clamp(18px,2vw,26px); position:relative; transition:.5s var(--ease-out); }
.dark .cap{ background:var(--ink); }
.cap:hover{ background:var(--white); }
.dark .cap:hover{ background:#16181E; }
.cap b{ display:block; font-size:clamp(19px,2vw,25px); font-weight:600; line-height:1.3; letter-spacing:0; }
.cap i{ display:block; font-style:normal; font-size:10.5px; font-weight:600; letter-spacing:.16em; color:var(--zhu); margin-bottom:14px; }
.cap span{ display:block; margin-top:10px; font-size:13.5px; line-height:1.68; color:var(--muted); }
.dark .cap span{ color:rgba(242,240,234,.55); }
.cap .dot{
  position:absolute; top:20px; right:20px; width:6px; height:6px; border-radius:50%;
  background:var(--line-2); transition:.4s;
}
.cap:hover .dot{ background:var(--zhu); box-shadow:0 0 0 5px var(--zhu-glow); }
@media (max-width:980px){ .caps{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:520px){ .caps{ grid-template-columns:1fr; } }

/* ---------- Compare (past vs future) ---------- */
.compare{ display:grid; grid-template-columns:1fr auto 1fr; gap:clamp(20px,4vw,52px); align-items:stretch; }
.compare-col{ padding:clamp(26px,3vw,40px); border:1px solid var(--line); border-radius:var(--r-l); position:relative; }
.compare-col.old{ background:var(--paper-2); }
.compare-col.new{ background:var(--ink); color:#F2F0EA; border-color:var(--ink); overflow:hidden; }
.compare-col.new::before{
  content:""; position:absolute; inset:0;
  background:radial-gradient(700px circle at 88% 8%,rgba(216,64,47,.28),transparent 58%);
  pointer-events:none;
}
.compare-tag{ font-size:11px; font-weight:600; letter-spacing:.18em; text-transform:uppercase; margin-bottom:20px; display:block; }
.compare-col.old .compare-tag{ color:var(--ink-3); }
.compare-col.new .compare-tag{ color:#E8846B; }
.compare-col h3{ font-size:clamp(23px,2.6vw,32px); font-weight:600; line-height:1.26; letter-spacing:-.01em; margin-bottom:22px; }
.compare-list li{ padding:13px 0; border-top:1px solid var(--line); font-size:15px; display:flex; gap:12px; align-items:flex-start; }
.compare-col.new .compare-list li{ border-top-color:rgba(255,255,255,.12); color:rgba(242,240,234,.82); }
.compare-list li::before{ content:"—"; color:var(--line-2); flex-shrink:0; }
.compare-col.new .compare-list li::before{ content:"→"; color:var(--zhu); }
.compare-arrow{ display:grid; place-items:center; }
.compare-arrow span{
  width:52px; height:52px; border-radius:50%; border:1px solid var(--line-2);
  display:grid; place-items:center; color:var(--zhu); background:var(--paper);
  animation:pulse 3.4s var(--ease) infinite;
}
@keyframes pulse{ 0%,100%{ box-shadow:0 0 0 0 var(--zhu-glow);} 50%{ box-shadow:0 0 0 14px transparent;} }
@media (max-width:900px){
  .compare{ grid-template-columns:1fr; }
  .compare-arrow{ transform:rotate(90deg); padding-block:4px; }
}

/* ---------- Chain / flow ---------- */
.chain{ display:flex; flex-wrap:wrap; gap:8px; }
.chain-step{
  display:flex; align-items:center; gap:9px; padding:10px 16px;
  border:1px solid var(--line); border-radius:100px; background:var(--white);
  font-size:13.5px; color:var(--ink-2); transition:.4s var(--ease-out);
  position:relative;
}
.chain-step:hover{ border-color:var(--zhu); color:var(--zhu); transform:translateY(-3px); box-shadow:var(--sh-1); }
.chain-step b{ font-size:11px; font-weight:700; color:var(--zhu); font-weight:600; }
.chain-step+.chain-step::before{
  content:"→"; position:absolute; left:-13px; color:var(--line-2); font-size:12px;
}
@media (max-width:760px){ .chain-step+.chain-step::before{ display:none; } }

/* vertical timeline */
.timeline{ position:relative; padding-left:0; }
.tl-item{ display:grid; grid-template-columns:64px 1fr; gap:22px; padding-block:24px; border-top:1px solid var(--line); }
.dark .tl-item{ border-top-color:rgba(255,255,255,.1); }
.tl-item:last-child{ border-bottom:1px solid var(--line); }
.dark .tl-item:last-child{ border-bottom-color:rgba(255,255,255,.1); }
.tl-n{ font-size:14px; font-weight:600; color:var(--zhu); letter-spacing:.06em; padding-top:4px; }
.tl-body h4{ font-size:18px; margin-bottom:7px; }
.tl-body p{ font-size:14.5px; color:var(--ink-3); line-height:1.76; max-width:640px; }
.dark .tl-body p{ color:rgba(242,240,234,.6); }
@media (max-width:640px){ .tl-item{ grid-template-columns:1fr; gap:6px; } }

/* ---------- Flywheel ---------- */
.flywheel-wrap{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(32px,5vw,72px); align-items:center; }
@media (max-width:900px){ .flywheel-wrap{ grid-template-columns:1fr; } }
.wheel{ position:relative; aspect-ratio:1; max-width:480px; margin-inline:auto; width:100%; }
.wheel svg{ width:100%; height:100%; overflow:visible; }
.wheel-ring{ fill:none; stroke:var(--line-2); stroke-width:1; }
.dark .wheel-ring{ stroke:rgba(255,255,255,.16); }
.wheel-arc{ fill:none; stroke:var(--zhu); stroke-width:1.5; stroke-dasharray:3 5; opacity:.6; }
.wheel-spin{ animation:spin 46s linear infinite; transform-origin:200px 200px; }
@keyframes spin{ to{ transform:rotate(360deg); } }
.wheel-node{ cursor:default; }
.wheel-node circle{ fill:var(--paper); stroke:var(--line-2); stroke-width:1; transition:.4s var(--ease-out); }
.dark .wheel-node circle{ fill:#171920; stroke:rgba(255,255,255,.2); }
.wheel-node:hover circle{ fill:var(--zhu); stroke:var(--zhu); }
.wheel-node text{ font-size:9px; letter-spacing:.11em; fill:var(--ink-3); font-weight:600; transition:.4s; }
.dark .wheel-node text{ fill:rgba(242,240,234,.72); }
.wheel-node:hover text{ fill:#fff; }
.wheel-core{ font-weight:600; }
@media (max-width:520px){ .wheel-node text{ font-size:11px; } }

/* formula */
.formula{
  display:flex; flex-wrap:wrap; align-items:center; gap:6px;
  font-size:clamp(17px,2.2vw,25px); font-weight:600; line-height:1.55;
  padding:clamp(24px,3vw,36px); border:1px solid var(--line); border-radius:var(--r-l);
  background:var(--white);
}
.dark .formula{ background:rgba(255,255,255,.04); border-color:rgba(255,255,255,.12); }
.formula .v{ color:var(--zhu); }
.formula .op{ color:var(--line-2); margin-inline:2px; }
.dark .formula .op{ color:rgba(255,255,255,.28); }

/* ---------- Marquee ---------- */
.marquee{ overflow:hidden; border-block:1px solid var(--line); padding-block:18px; }
.dark .marquee{ border-color:rgba(255,255,255,.1); }
.marquee-track{ display:flex; gap:44px; width:max-content; animation:slide 40s linear infinite; }
.marquee:hover .marquee-track{ animation-play-state:paused; }
@keyframes slide{ to{ transform:translateX(calc(-50% - 22px)); } }
.marquee-item{
  display:flex; align-items:center; gap:16px; white-space:nowrap;
  font-size:clamp(15px,1.6vw,20px); font-weight:600; color:var(--ink-2);
}
.dark .marquee-item{ color:rgba(242,240,234,.7); }
.marquee-item::after{ content:"·"; color:var(--zhu); font-size:20px; }
@media (prefers-reduced-motion: reduce){ .marquee-track{ animation:none; } }

/* ---------- Stats ---------- */
.stat-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line); border:1px solid var(--line); }
.dark .stat-grid{ background:rgba(255,255,255,.1); border-color:rgba(255,255,255,.1); }
.stat{ background:var(--paper); padding:clamp(24px,2.8vw,34px) clamp(18px,2vw,26px); }
.dark .stat{ background:var(--ink); }
.stat b{ display:block; font-size:clamp(28px,3.4vw,44px); font-weight:600; line-height:1.1; letter-spacing:-.012em; }
.stat b em{ font-style:normal; font-size:.5em; color:var(--zhu); margin-left:3px; }
.stat span{ display:block; margin-top:10px; font-size:13px; color:var(--muted); }
.dark .stat span{ color:rgba(242,240,234,.55); }
@media (max-width:820px){ .stat-grid{ grid-template-columns:repeat(2,1fr); } }

/* ---------- Quote / statement ---------- */
.statement{
  font-size:clamp(24px,3.6vw,46px); font-weight:600; line-height:1.42; letter-spacing:-.01em;
  letter-spacing:-.015em; max-width:1000px;
}
.statement em{ font-style:italic; color:var(--zhu); }
.quote{
  border-left:2px solid var(--zhu); padding-left:clamp(20px,2.6vw,34px);
  font-size:clamp(19px,2.2vw,27px); font-weight:600; line-height:1.55; letter-spacing:0;
}
.quote cite{ display:block; margin-top:18px; font-style:normal; font-size:13px; font-weight:500; color:var(--muted); letter-spacing:.04em; }

/* ---------- Layers / stack ---------- */
.layer-row{ display:grid; grid-template-columns:150px 1fr; gap:clamp(16px,3vw,40px); padding-block:24px; border-top:1px solid var(--line); align-items:start; }
.dark .layer-row{ border-top-color:rgba(255,255,255,.1); }
.layer-row:last-child{ border-bottom:1px solid var(--line); }
.dark .layer-row:last-child{ border-bottom-color:rgba(255,255,255,.1); }
.layer-key{ }
.layer-key b{ display:block; font-size:19px; font-weight:600; line-height:1.35; }
.layer-key span{ display:block; font-size:10.5px; font-weight:600; letter-spacing:.16em; color:var(--zhu); margin-top:4px; }
.layer-val p{ font-size:14.5px; color:var(--ink-3); line-height:1.78; max-width:720px; }
.dark .layer-val p{ color:rgba(242,240,234,.6); }
@media (max-width:640px){ .layer-row{ grid-template-columns:1fr; gap:10px; } }

/* ---------- Gallery chips ---------- */
.chips{ display:flex; flex-wrap:wrap; gap:9px; }
.chip{
  padding:8px 15px; border:1px solid var(--line); border-radius:100px; font-size:13.5px;
  color:var(--ink-2); background:var(--white); transition:.35s var(--ease-out);
}
.dark .chip{ background:rgba(255,255,255,.03); border-color:rgba(255,255,255,.12); color:rgba(242,240,234,.7); }
.chip:hover{ border-color:var(--zhu); color:var(--zhu); transform:translateY(-2px); }
.chip.on{ background:var(--ink); color:#fff; border-color:var(--ink); }
.dark .chip.on{ background:#fff; color:var(--ink); }

/* numbered big list */
.biglist li{ padding-block:clamp(22px,2.4vw,30px); border-top:1px solid var(--line); display:grid; grid-template-columns:56px 1fr; gap:18px; }
.dark .biglist li{ border-top-color:rgba(255,255,255,.1); }
.biglist li:last-child{ border-bottom:1px solid var(--line); }
.dark .biglist li:last-child{ border-bottom-color:rgba(255,255,255,.1); }
.biglist h4{ font-size:clamp(18px,2vw,22px); margin-bottom:8px; font-weight:600; line-height:1.4; }
.biglist p{ font-size:14.5px; color:var(--ink-3); line-height:1.78; max-width:700px; }
.dark .biglist p{ color:rgba(242,240,234,.58); }

/* ---------- CTA band ---------- */
.cta-band{ position:relative; overflow:hidden; background:var(--ink); color:#F2F0EA; }
.cta-band::before{
  content:""; position:absolute; inset:0;
  background:radial-gradient(900px circle at 12% 10%,rgba(216,64,47,.3),transparent 55%),
             radial-gradient(700px circle at 92% 92%,rgba(35,48,94,.6),transparent 60%);
}
.cta-inner{ position:relative; z-index:2; text-align:center; max-width:900px; margin-inline:auto; }
.dark .cta-band{ background:#08090C; }

/* ---------- Page hero (inner) ---------- */
.page-hero{
  padding-top:clamp(140px,15vw,190px); padding-bottom:clamp(56px,7vw,96px);
  background:var(--paper-2); position:relative; overflow:hidden;
  border-bottom:1px solid var(--line);
}
.page-hero::before{
  content:""; position:absolute; right:-8%; top:-30%; width:52vw; height:52vw; border-radius:50%;
  background:radial-gradient(circle,var(--zhu-glow),transparent 66%);
}
.page-hero-inner{ position:relative; z-index:2; }
.crumb{ display:flex; align-items:center; gap:8px; font-size:12.5px; color:var(--muted); margin-bottom:22px; }
.crumb a:hover{ color:var(--zhu); }
.side-nav{ display:flex; flex-wrap:wrap; gap:8px; margin-top:34px; }

/* ---------- TOC strip ---------- */
.toc{
  position:sticky; top:74px; z-index:60;
  background:rgba(251,250,247,.9); backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line); padding-block:12px;
}
.toc-inner{ display:flex; gap:6px; overflow-x:auto; scrollbar-width:none; }
.toc-inner::-webkit-scrollbar{ display:none; }
.toc a{
  font-size:13px; padding:6px 13px; border-radius:100px; color:var(--ink-3);
  border:1px solid transparent; white-space:nowrap; transition:.3s;
}
.toc a:hover,.toc a.on{ color:var(--zhu); border-color:var(--line-2); background:var(--white); }

/* ---------- Footer ---------- */
.footer{ background:var(--ink); color:rgba(242,240,234,.62); padding-top:clamp(60px,7vw,92px); padding-bottom:34px; position:relative; overflow:hidden; }
.footer::before{
  content:""; position:absolute; left:-10%; bottom:-40%; width:60vw; height:60vw; border-radius:50%;
  background:radial-gradient(circle,rgba(216,64,47,.14),transparent 62%);
}
.foot-top{ position:relative; z-index:2; display:grid; grid-template-columns:1.6fr 1fr 1fr 1fr; gap:clamp(24px,4vw,56px); padding-bottom:clamp(40px,5vw,64px); }
@media (max-width:900px){ .foot-top{ grid-template-columns:1fr 1fr; } }
@media (max-width:560px){ .foot-top{ grid-template-columns:1fr; } }
.foot-brand .brand-mark{ color:#FCFBF8; font-size:26px; }
.foot-brand p{ margin-top:18px; font-size:14px; line-height:1.8; color:rgba(242,240,234,.55); max-width:340px; }
.foot-col h5{ font-size:11.5px; letter-spacing:.18em; text-transform:uppercase; color:rgba(242,240,234,.4); margin-bottom:18px; font-weight:600; }
.foot-col a{ display:block; padding:6px 0; font-size:14px; color:rgba(242,240,234,.66); transition:.3s; }
.foot-col a:hover{ color:#fff; transform:translateX(3px); }
.foot-bot{
  position:relative; z-index:2; border-top:1px solid rgba(255,255,255,.1); padding-top:24px;
  display:flex; flex-wrap:wrap; gap:14px; justify-content:space-between; align-items:center;
  font-size:12.5px; color:rgba(242,240,234,.4);
}
.foot-bot a:hover{ color:#fff; }
.foot-copy{ display:inline-flex; align-items:center; flex-wrap:wrap; gap:12px; }
.foot-bot .beian{
  color:rgba(242,240,234,.6); border-bottom:1px solid rgba(255,255,255,.18);
  padding-bottom:1px; transition:.3s var(--ease-out);
}
.foot-bot .beian:hover{ color:#fff; border-bottom-color:rgba(255,255,255,.55); }

/* ---------- misc ---------- */
.split{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(28px,5vw,72px); align-items:center; }
.split-4{ grid-template-columns:.85fr 1.15fr; }
@media (max-width:900px){ .split,.split-4{ grid-template-columns:1fr; } }
.visual{
  position:relative; border:1px solid var(--line); border-radius:var(--r-l);
  background:var(--white); padding:clamp(24px,3vw,40px); overflow:hidden;
}
.dark .visual{ background:rgba(255,255,255,.04); border-color:rgba(255,255,255,.1); }
.visual-label{ font-size:10.5px; font-weight:600; letter-spacing:.18em; color:var(--zhu); margin-bottom:20px; }

.kpi-row{ display:flex; flex-wrap:wrap; gap:clamp(20px,4vw,48px); }
.kpi b{ display:block; font-size:clamp(22px,2.6vw,32px); font-weight:600; line-height:1.2; letter-spacing:-.01em; }
.kpi span{ display:block; margin-top:8px; font-size:13px; color:var(--muted); }
.dark .kpi span{ color:rgba(242,240,234,.55); }

.dot-grid{
  background-image:radial-gradient(var(--line-2) 1px,transparent 1px);
  background-size:16px 16px;
}
.dark .dot-grid{ background-image:radial-gradient(rgba(255,255,255,.16) 1px,transparent 1px); }

.pull{
  padding:clamp(26px,3vw,40px); border-radius:var(--r-l);
  background:linear-gradient(135deg,var(--zhu-soft),var(--gold-soft));
  border:1px solid rgba(216,64,47,.16);
}
.pull p{ font-size:clamp(18px,2.2vw,26px); font-weight:600; line-height:1.55; letter-spacing:0; color:var(--ink); }
.pull .mono{ color:var(--zhu-dark); margin-bottom:14px; display:block; }

.notify{
  display:inline-flex; align-items:center; gap:10px; padding:7px 15px 7px 10px;
  border:1px solid var(--line); border-radius:100px; font-size:13px; color:var(--ink-2); background:var(--white);
}
.dark .notify{ background:rgba(255,255,255,.05); border-color:rgba(255,255,255,.12); color:rgba(242,240,234,.7); }
.notify i{ width:6px; height:6px; border-radius:50%; background:var(--zhu); box-shadow:0 0 0 4px var(--zhu-glow); animation:blink 2.6s ease-in-out infinite; }
@keyframes blink{ 50%{ opacity:.35; } }

.note{ font-size:13.5px; color:var(--muted); margin-top:14px; }
.dark .note{ color:rgba(242,240,234,.45); }

.table-wrap{ overflow-x:auto; border:1px solid var(--line); border-radius:var(--r-m); }
.dark .table-wrap{ border-color:rgba(255,255,255,.1); }
table{ width:100%; border-collapse:collapse; min-width:560px; }
th,td{ text-align:left; padding:16px 20px; border-bottom:1px solid var(--line); font-size:14.5px; vertical-align:top; }
.dark th,.dark td{ border-bottom-color:rgba(255,255,255,.1); }
th{ font-size:12px; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); font-weight:600; background:var(--paper-2); }
.dark th{ background:rgba(255,255,255,.04); color:rgba(242,240,234,.5); }
td{ color:var(--ink-3); }
.dark td{ color:rgba(242,240,234,.62); }
tbody tr{ transition:.3s; }
tbody tr:hover{ background:var(--paper-2); }
.dark tbody tr:hover{ background:rgba(255,255,255,.03); }
td strong{ color:var(--ink); font-weight:600; }
.dark td strong{ color:#fff; }