:root{
  --paper:#EDEFEA;
  --paper-2:#E3E6E0;
  --paper-3:#F4F5F1;
  --ink:#121818;
  --ink-soft:#46514B;
  --muted:#7B857D;
  --line:rgba(18,24,24,.16);
  --line-soft:rgba(18,24,24,.09);
  --blue:#2440DA;
  --dark:#0D1312;
  --dark-2:#141B19;
  --dark-line:rgba(237,239,234,.18);
  --dark-muted:rgba(237,239,234,.56);
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB",sans-serif;
  --serif:"Noto Serif SC","Songti SC",Georgia,serif;
  --mono:"IBM Plex Mono","SFMono-Regular",Menlo,monospace;
  --nav-h:64px;
  --pad:clamp(20px,5vw,88px);
  --maxw:1360px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
  text-wrap:pretty;
}
img{display:block;max-width:100%}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;margin:0;line-height:1.22;letter-spacing:-.01em}
p{margin:0}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--blue);color:#fff}

.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:var(--pad)}
#positioning,#matrix,#walkthrough,#controls,#deployment,#choice{scroll-margin-top:calc(var(--nav-h) + 12px)}
.module{scroll-margin-top:calc(var(--nav-h) + 66px)}
.mono{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase}
.eyebrow{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-soft)}
.eyebrow .dot{width:4px;height:4px;background:var(--blue);border-radius:50%}
.eyebrow .sep{color:var(--muted)}

/* ---------- top nav ---------- */
.topbar{
  position:sticky;top:0;z-index:60;
  background:rgba(237,239,234,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{display:flex;align-items:center;gap:32px;height:var(--nav-h);max-width:var(--maxw);margin:0 auto;padding-inline:var(--pad)}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;flex:0 0 auto}
.brand-mark{display:flex;gap:3px;align-items:flex-end;height:15px}
.brand-mark i{display:block;width:4px;background:var(--ink)}
.brand-mark i:first-child{height:15px}
.brand-mark i:last-child{height:11px}
.brand-word{font-family:var(--mono);font-size:12px;letter-spacing:.22em;font-weight:500}
.brand-sub{color:var(--muted);border-left:1px solid var(--line);padding-left:16px;height:16px;display:flex;align-items:center;font-size:12px;letter-spacing:.04em;white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:26px;margin-left:auto}
.nav-links a{font-size:13px;text-decoration:none;color:var(--ink-soft);padding:6px 0;position:relative;white-space:nowrap}
.nav-links a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--ink);transform:scaleX(0);transform-origin:left;transition:transform .25s ease}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1)}
.nav-links a.active{color:var(--ink)}
.nav-version{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted);border-left:1px solid var(--line);padding-left:22px;white-space:nowrap}
.nav-progress{position:absolute;left:0;bottom:-1px;height:1px;background:var(--blue);width:0;transition:width .15s linear}

/* ---------- hero ---------- */
.hero{padding-top:clamp(56px,8vw,96px);padding-bottom:clamp(48px,6vw,80px)}
.hero-top{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:clamp(40px,6vw,88px);align-items:start}
.hero-eyebrow{display:flex;align-items:center;gap:12px;font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--ink-soft);text-transform:uppercase;margin-bottom:28px}
.hero-eyebrow .dot{width:5px;height:5px;background:var(--blue);border-radius:50%}
.hero h1{font-size:clamp(46px,7.2vw,96px);line-height:1.06;letter-spacing:-.02em;font-weight:600}
.hero h1 em{font-style:normal;color:var(--blue)}
.hero-lead{margin-top:34px;max-width:640px;font-size:16.5px;line-height:1.95;color:var(--ink-soft)}
.hero-actions{display:flex;gap:14px;margin-top:38px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:10px;height:48px;padding:0 26px;font-size:14px;text-decoration:none;border:1px solid var(--ink);background:var(--ink);color:#F1F2EE;transition:background .2s ease,color .2s ease,border-color .2s}
.btn:hover{background:transparent;color:var(--ink)}
.btn-ghost{background:transparent;color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#F1F2EE}
.btn .arrow{font-family:var(--mono);font-size:13px}

.material{border-top:1px solid var(--ink);padding-top:18px}
.material .mono{color:var(--blue)}
.material-text{margin-top:16px;font-size:13px;line-height:1.85;color:var(--ink-soft)}
.material-grid{display:grid;grid-template-columns:1fr 1fr;margin-top:26px;border-top:1px solid var(--line-soft)}
.material-cell{padding:16px 0 14px;border-bottom:1px solid var(--line-soft)}
.material-cell:nth-child(odd){border-right:1px solid var(--line-soft);padding-right:16px}
.material-cell:nth-child(even){padding-left:20px}
.material-cell .k{font-size:11px;color:var(--muted);letter-spacing:.06em}
.material-cell .v{font-family:var(--serif);font-size:34px;line-height:1.1;margin-top:6px}

/* hero duo cards */
.duo{display:grid;grid-template-columns:1fr 44px 1fr;margin-top:clamp(48px,6vw,72px);border:1px solid var(--line)}
.duo-card{padding:clamp(26px,3vw,38px);display:flex;flex-direction:column;gap:18px;min-height:196px}
.duo-card.light{background:var(--paper-3)}
.duo-card.dark{background:var(--dark);color:var(--paper)}
.duo-kicker{font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.duo-card.dark .duo-kicker{color:var(--dark-muted)}
.duo-card h3{font-size:30px;letter-spacing:-.01em}
.duo-card p{font-size:13.5px;line-height:1.75;color:var(--ink-soft);max-width:340px}
.duo-card.dark p{color:rgba(237,239,234,.72)}
.duo-fit{margin-top:auto;font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--muted);padding-top:16px;border-top:1px solid var(--line-soft)}
.duo-card.dark .duo-fit{color:var(--dark-muted);border-color:var(--dark-line)}
.duo-mid{display:flex;align-items:center;justify-content:center;background:var(--paper);border-left:1px solid var(--line);border-right:1px solid var(--line)}
.duo-mid span{writing-mode:vertical-rl;font-family:var(--mono);font-size:10.5px;letter-spacing:.4em;color:var(--muted);white-space:nowrap}

/* ---------- section shell ---------- */
.section{padding-block:clamp(64px,8vw,112px);border-top:1px solid var(--line)}
.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.78fr);gap:clamp(28px,5vw,80px);align-items:end;padding-bottom:clamp(30px,4vw,48px)}
.section-eyebrow{display:flex;align-items:baseline;gap:16px;margin-bottom:22px;font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--blue)}
.section-eyebrow .num{color:var(--ink);font-weight:500}
.section h2{font-size:clamp(30px,3.4vw,46px);line-height:1.24;letter-spacing:-.015em}
.section-lead{font-size:15px;line-height:1.95;color:var(--ink-soft);max-width:520px;padding-bottom:6px}

/* ---------- 01 positioning ---------- */
.points{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--ink)}
.point{padding:30px 30px 8px 0;border-right:1px solid var(--line-soft)}
.point:last-child{border-right:0;padding-right:0}
.point .n{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--blue)}
.point h3{font-size:20px;margin-top:16px;line-height:1.5;font-family:var(--sans);font-weight:600}
.point p{margin-top:12px;font-size:14px;line-height:1.9;color:var(--ink-soft)}
.point .tag{display:inline-block;margin-top:18px;font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);border:1px solid var(--line);padding:4px 8px}

/* ---------- 02 matrix ---------- */
.matrix{border-top:1px solid var(--ink);margin-top:8px}
.matrix-row{display:grid;grid-template-columns:1.02fr 1.5fr 1.5fr;border-bottom:1px solid var(--line-soft);transition:background .2s ease}
.matrix-row:hover{background:rgba(18,24,24,.035)}
.matrix-row > *{padding:18px 22px 18px 0;font-size:14.5px;line-height:1.75}
.matrix-row > *:nth-child(2),.matrix-row > *:nth-child(3){padding-left:24px;border-left:1px solid var(--line-soft);color:var(--ink-soft)}
.matrix-head{border-bottom:1px solid var(--line);align-items:end}
.matrix-row.matrix-head > *{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);padding-top:0;padding-bottom:14px;line-height:1.7;border-left:0}
.matrix-row.matrix-head > *:nth-child(2),.matrix-row.matrix-head > *:nth-child(3){padding-left:24px;border-left:1px solid var(--line-soft)}
.matrix-head .dim{color:var(--ink)}
.matrix-dim{font-weight:500;color:var(--ink)}
.matrix-note{margin-top:18px;font-size:12.5px;color:var(--muted);line-height:1.8;max-width:760px}

.foundation{margin-top:clamp(40px,5vw,64px);border:1px solid var(--line);background:var(--paper-3);padding:clamp(24px,3vw,36px)}
.foundation-head{display:flex;align-items:baseline;gap:18px;flex-wrap:wrap;border-bottom:1px solid var(--line-soft);padding-bottom:18px}
.foundation-head .mono{color:var(--blue)}
.foundation-head h3{font-size:20px;font-family:var(--sans);font-weight:600}
.foundation-list{display:grid;grid-template-columns:repeat(5,1fr);gap:0;margin-top:22px}
.foundation-item{padding-right:18px;border-right:1px solid var(--line-soft)}
.foundation-item:last-child{border-right:0}
.foundation-item .n{font-family:var(--mono);font-size:10px;color:var(--muted);letter-spacing:.1em}
.foundation-item .t{font-size:14px;margin-top:8px;line-height:1.6}

/* ---------- 03 walkthrough ---------- */
.wt{background:var(--paper)}
.module-nav{position:sticky;top:var(--nav-h);z-index:40;background:rgba(237,239,234,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);margin-top:6px}
.module-nav-inner{display:flex;gap:0;overflow-x:auto;max-width:var(--maxw);margin:0 auto;padding-inline:var(--pad);scrollbar-width:none}
.module-nav-inner::-webkit-scrollbar{display:none}
.module-nav a{flex:0 0 auto;font-size:12.5px;text-decoration:none;color:var(--ink-soft);padding:15px 20px 14px;border-bottom:2px solid transparent;white-space:nowrap}
.module-nav a:first-child{padding-left:0}
.module-nav a .mn{font-family:var(--mono);font-size:10.5px;color:var(--muted);margin-right:6px}
.module-nav a:hover{color:var(--ink)}
.module-nav a.active{color:var(--blue);border-color:var(--blue)}
.module-nav a.active .mn{color:var(--blue)}

.module{padding-top:clamp(48px,6vw,72px)}
.module-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.62fr);gap:clamp(24px,5vw,72px);align-items:start;padding-bottom:26px;border-bottom:1px solid var(--ink)}
.module-head .mnum{display:flex;align-items:baseline;gap:16px;font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--blue);margin-bottom:16px}
.module-head .mnum .count{color:var(--muted);letter-spacing:.1em;font-size:10.5px}
.module-head h3{font-size:clamp(26px,2.6vw,34px);line-height:1.3}
.module-head .mlead{font-size:14px;line-height:1.95;color:var(--ink-soft);padding-top:30px}

.split{display:grid;grid-template-columns:1fr 1fr;position:relative;border-bottom:1px solid var(--line)}
.split::after{content:"";position:absolute;top:0;bottom:0;left:50%;border-left:1px dashed rgba(18,24,24,.28);z-index:3;pointer-events:none}
.split-label{position:absolute;right:50%;top:170px;z-index:4;display:flex;flex-direction:column;gap:8px;align-items:flex-end;background:var(--paper);padding:12px 10px 12px 12px}
.split-label span{writing-mode:vertical-rl;font-family:var(--mono);font-size:10px;letter-spacing:.34em;color:var(--muted);line-height:1}
.split-label i{width:3px;height:3px;background:var(--blue);border-radius:50%}
.col-light{padding:34px 34px 48px 0;min-height:200px}
.col-light-inner{position:sticky;top:calc(var(--nav-h) + 58px)}
.col-dark{background:var(--dark);color:var(--paper);padding:34px 0 48px 34px}

.col-head{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.col-dark .col-head{color:var(--dark-muted)}
.col-head .pill{border:1px solid var(--line);padding:2px 7px;font-size:9.5px;letter-spacing:.12em}
.col-dark .col-head .pill{border-color:var(--dark-line)}

.shot{margin:0 0 30px}
.split .col-light .shot:last-child,.split .col-dark .shot:last-child{margin-bottom:0}
.shot-frame{position:relative;overflow:hidden;border:1px solid var(--line);background:#fff;cursor:zoom-in}
.col-dark .shot-frame{border-color:rgba(237,239,234,.2)}
.shot-frame img{width:100%;height:auto;transition:transform .5s cubic-bezier(.2,.6,.2,1)}
.shot-frame:hover img{transform:scale(1.012)}
.shot-frame::after{content:"放大";position:absolute;right:10px;bottom:10px;font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;background:rgba(13,19,18,.78);color:#EDEFEA;padding:4px 8px;opacity:0;transition:opacity .2s ease}
.shot-frame:hover::after{opacity:1}
.shot figcaption{margin-top:12px;display:grid;gap:3px}
.shot-kicker{font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.col-dark .shot-kicker{color:var(--dark-muted)}
.shot-title{font-size:14px;font-weight:500;color:var(--ink)}
.col-dark .shot-title{color:var(--paper)}
.shot-desc{font-size:12.5px;line-height:1.8;color:var(--ink-soft)}
.col-dark .shot-desc{color:rgba(237,239,234,.66)}

.module-summary{margin-top:26px;padding-left:22px;border-left:2px solid var(--blue);font-size:13.5px;line-height:1.85;color:var(--ink-soft)}
.module-summary b{font-weight:500;color:var(--ink)}
.col-light .aside-note{margin-top:22px;border-top:1px solid var(--line-soft);padding-top:16px;font-size:12.5px;color:var(--muted);line-height:1.85}
.col-light .aside-note .arrow{color:var(--blue);font-family:var(--mono)}

.wt-outro{margin-top:40px;font-size:12.5px;color:var(--muted);border-top:1px solid var(--line);padding-top:16px;line-height:1.85}

/* ---------- 04 dark section ---------- */
.dark-section{background:var(--dark);color:var(--paper);border-top:1px solid var(--dark);padding-block:clamp(64px,8vw,104px)}
.dark-section .section-eyebrow{color:rgba(237,239,234,.62)}
.dark-section .section-eyebrow .num{color:var(--paper)}
.dark-section h2{color:var(--paper)}
.dark-section .section-lead{color:rgba(237,239,234,.68)}
.cap-table{border-top:1px solid var(--paper);margin-top:10px}
.cap-row{display:grid;grid-template-columns:.9fr 2fr .6fr;border-bottom:1px solid var(--dark-line);transition:background .2s ease}
.cap-row:hover{background:rgba(237,239,234,.04)}
.cap-row > *{padding:15px 22px 15px 0;font-size:14px;line-height:1.7}
.cap-row > *:nth-child(2){padding-left:24px;border-left:1px solid var(--dark-line);color:rgba(237,239,234,.72)}
.cap-row > *:nth-child(3){padding-left:24px;border-left:1px solid var(--dark-line);font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:rgba(237,239,234,.6)}
.cap-head{border-bottom:1px solid var(--dark-line)}
.cap-row.cap-head > *{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:rgba(237,239,234,.45);padding-top:0;padding-bottom:12px;border-left:0}
.cap-row.cap-head > *:nth-child(2),.cap-row.cap-head > *:nth-child(3){padding-left:24px;border-left:1px solid var(--dark-line)}
.cap-head .c{color:var(--paper)}
.cap-name{font-weight:500}

.figure{margin:clamp(38px,5vw,56px) 0 0}
.figure .shot-frame{border-color:rgba(237,239,234,.22);background:transparent}
.figure figcaption{margin-top:12px;font-family:var(--mono);font-size:11px;letter-spacing:.04em;line-height:1.9;color:rgba(237,239,234,.58)}
.figure figcaption .fk{color:var(--blue);margin-right:14px;letter-spacing:.12em}

.notes{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:clamp(40px,5vw,60px);border-top:1px solid var(--dark-line)}
.note{padding:22px 24px 0 0;border-right:1px solid var(--dark-line)}
.note:last-child{border-right:0;padding-right:0}
.note .letter{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;color:var(--blue)}
.note h4{font-family:var(--sans);font-size:14px;font-weight:600;margin-top:12px}
.note p{margin-top:8px;font-size:12.5px;line-height:1.85;color:rgba(237,239,234,.64)}

/* ---------- 05 deployment ---------- */
.deploy-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,5vw,72px);align-items:start}
.deploy-list{border-top:1px solid var(--ink)}
.deploy-item{display:grid;grid-template-columns:26px 1fr;gap:18px;padding:20px 0;border-bottom:1px solid var(--line-soft)}
.deploy-item .l{font-family:var(--mono);font-size:10.5px;color:var(--blue);letter-spacing:.1em;padding-top:5px}
.deploy-item h4{font-family:var(--sans);font-size:15px;font-weight:600;line-height:1.7}
.deploy-item p{margin-top:5px;font-size:13.5px;line-height:1.85;color:var(--ink-soft)}

.measure{display:grid;gap:20px}
.measure-box{border:1px solid var(--line);background:var(--paper-3)}
.measure-box.dark{background:var(--dark);color:var(--paper);border-color:var(--dark)}
.measure-head{padding:16px 22px;border-bottom:1px solid var(--line-soft);font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-soft)}
.measure-box.dark .measure-head{border-color:var(--dark-line);color:rgba(237,239,234,.62)}
.measure-rows{padding:6px 22px 18px}
.measure-row{display:flex;justify-content:space-between;gap:20px;padding:11px 0;border-bottom:1px dashed var(--line-soft);font-size:13.5px}
.measure-row:last-child{border-bottom:0}
.measure-row .k{color:var(--ink-soft)}
.measure-row .v{font-family:var(--mono);font-size:12.5px;letter-spacing:.02em}
.measure-box.dark .measure-row{border-color:var(--dark-line)}
.measure-box.dark .measure-row .k{color:rgba(237,239,234,.6)}
.measure-box.dark .measure-row .v{color:var(--paper)}

/* ---------- 06 choice ---------- */
.choice{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.choice-card{border:1px solid var(--line);background:var(--paper-3);padding:28px 26px 24px;display:flex;flex-direction:column;gap:14px;transition:border-color .2s ease,transform .2s ease}
.choice-card:hover{border-color:var(--ink);transform:translateY(-2px)}
.choice-id{display:flex;align-items:center;justify-content:space-between;font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--blue)}
.choice-card h3{font-size:23px;line-height:1.4}
.choice-card p{font-size:13.5px;line-height:1.9;color:var(--ink-soft)}
.choice-rec{margin-top:auto;padding-top:16px;border-top:1px solid var(--line-soft);font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--muted);display:flex;justify-content:space-between}
.choice-rec b{font-weight:500;color:var(--ink)}

.conclusion-band{background:var(--dark);color:var(--paper);padding-block:clamp(46px,6vw,76px)}
.conclusion{color:var(--paper)}
.conclusion .mono{color:rgba(237,239,234,.5);display:block;margin-bottom:22px}
.conclusion h2{color:var(--paper);font-size:clamp(28px,3.4vw,46px);line-height:1.45;letter-spacing:-.01em;max-width:1000px}
.conclusion-meta{display:grid;grid-template-columns:repeat(3,auto);gap:clamp(28px,6vw,96px);justify-content:start;margin-top:clamp(32px,4vw,48px);padding-top:22px;border-top:1px solid var(--dark-line)}
.conclusion-meta .k{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:rgba(237,239,234,.48)}
.conclusion-meta .v{margin-top:8px;font-size:14px;color:var(--paper)}
.conclusion-meta a{color:var(--paper);text-decoration:none;border-bottom:1px solid rgba(237,239,234,.5);padding-bottom:2px}
.conclusion-meta a:hover{border-color:var(--paper)}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line);padding-block:clamp(44px,5vw,64px) 60px}
.footer-grid{display:grid;grid-template-columns:1fr 300px;gap:clamp(32px,6vw,80px)}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:22px}
.footer p{font-size:12.5px;line-height:1.95;color:var(--ink-soft);max-width:520px}
.footer .mono{color:var(--muted)}
.footer-index{margin-top:0}
.footer-index .mono{display:block;margin-bottom:16px}
.footer-index ul{list-style:none;margin:0;padding:0;border-top:1px solid var(--line-soft)}
.footer-index li{border-bottom:1px solid var(--line-soft)}
.footer-index a{display:flex;justify-content:space-between;gap:14px;padding:9px 0;font-size:12.5px;text-decoration:none;color:var(--ink-soft)}
.footer-index a:hover{color:var(--ink)}
.footer-index a span{font-family:var(--mono);font-size:10px;color:var(--muted)}
.footer-base{display:flex;justify-content:space-between;gap:20px;margin-top:44px;padding-top:16px;border-top:1px solid var(--line-soft);font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--muted);text-transform:uppercase}

/* ---------- lightbox ---------- */
.lightbox{position:fixed;inset:0;z-index:200;display:none;flex-direction:column;background:rgba(9,13,12,.96);padding:24px clamp(16px,4vw,56px) 28px;color:var(--paper)}
.lightbox.open{display:flex}
.lb-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-bottom:16px}
.lb-count{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:rgba(237,239,234,.6)}
.lb-actions{display:flex;gap:8px;align-items:center}
.lb-btn{border:1px solid rgba(237,239,234,.3);width:38px;height:38px;display:grid;place-items:center;color:var(--paper);font-family:var(--mono);font-size:13px;transition:background .2s ease,color .2s ease}
.lb-btn:hover{background:var(--paper);color:var(--ink)}
.lb-stage{flex:1;min-height:0;display:grid;place-items:center}
.lb-stage img{max-width:100%;max-height:100%;object-fit:contain;background:#fff;border:1px solid rgba(237,239,234,.2)}
.lb-cap{margin-top:16px;font-size:12.5px;line-height:1.8;color:rgba(237,239,234,.75);max-width:980px}
.lb-cap .t{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:rgba(237,239,234,.45);display:block;margin-bottom:4px}

.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .brand-sub{display:none}
  .nav-links{gap:18px;overflow-x:auto}
  .hero-top{grid-template-columns:1fr 280px;gap:40px}
}
@media (max-width:980px){
  .nav-links{display:none}
  .nav-version{margin-left:auto}
  .hero-top{grid-template-columns:1fr;gap:44px}
  .section-head{grid-template-columns:1fr;gap:22px;align-items:start}
  .section-lead{padding-bottom:0}
  .points{grid-template-columns:1fr}
  .point{border-right:0;border-bottom:1px solid var(--line-soft);padding:24px 0}
  .point:last-child{border-bottom:0}
  .foundation-list{grid-template-columns:1fr 1fr;gap:18px}
  .foundation-item{border-right:0}
  .module-head{grid-template-columns:1fr;gap:14px}
  .module-head .mlead{padding-top:0}
  .split{grid-template-columns:1fr}
  .split::after{display:none}
  .split-label{display:none}
  .col-light{padding:28px 0 8px}
  .col-light-inner{position:static}
  .col-dark{margin-right:calc(var(--pad) * -1);margin-left:calc(var(--pad) * -1);padding:28px var(--pad) 36px}
  .cap-row{grid-template-columns:1fr 1.4fr .5fr}
  .notes{grid-template-columns:1fr 1fr;gap:0}
  .note{padding:20px 20px 0 0;border-bottom:1px solid var(--dark-line)}
  .deploy-grid{grid-template-columns:1fr}
  .choice{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:36px}
  .duo{grid-template-columns:1fr;border:0;gap:0}
  .duo-mid{display:none}
  .duo-card{border:1px solid var(--line)}
  .duo-card.dark{border-color:var(--dark);margin-top:-1px}
}
@media (max-width:760px){
  .matrix-head{display:none}
  .matrix-row{grid-template-columns:1fr;padding:16px 0;gap:6px}
  .matrix-row > *{padding:0}
  .matrix-row > *:nth-child(2),.matrix-row > *:nth-child(3){padding-left:0;border-left:0}
  .matrix-row > *:nth-child(2)::before{content:"SAAS · ";font-family:var(--mono);font-size:9.5px;color:var(--muted);letter-spacing:.1em}
  .matrix-row > *:nth-child(3)::before{content:"私有化 · ";font-family:var(--mono);font-size:9.5px;color:var(--muted);letter-spacing:.1em}
  .matrix-dim{font-size:13px;font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
  .cap-row{grid-template-columns:1fr;padding:14px 0;gap:5px}
  .cap-row > *{padding:0}
  .cap-row > *:nth-child(2),.cap-row > *:nth-child(3){padding-left:0;border-left:0}
  .cap-row > *:nth-child(3)::before{content:"位置 ";color:rgba(237,239,234,.4)}
  .cap-head{display:none}
  .notes{grid-template-columns:1fr}
  .note{border-right:0}
  .conclusion-meta{grid-template-columns:1fr;gap:20px}
  .foundation-list{grid-template-columns:1fr}
  .module-nav a{padding:13px 14px}
  .hero h1{font-size:clamp(38px,10vw,58px)}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
}