:root {
  color-scheme: light;
  --paper: #f4f7f3;
  --paper-2: #eaf0e9;
  --ink: #15201a;
  --muted: #66736b;
  --green: #43bd79;
  --brand-action: #4fbe72;
  --brand-action-hover: #63cb82;
  --on-brand-action: #102d1c;
  --green-dark: #1a7346;
  --green-soft: #d9f2e2;
  --violet: #8364cf;
  --night: #101a16;
  --line: rgba(31, 60, 43, .13);
  --shell: min(1180px, calc(100vw - 48px));
  --radius-s: 14px;
  --radius-m: 24px;
  --radius-l: 40px;
  --shadow: 0 34px 100px rgba(31, 58, 41, .15);
  --ease: cubic-bezier(.22, 1, .36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; background: var(--paper); }
body { margin: 0; min-width: 320px; overflow-x: hidden; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
::selection { color: #0b2718; background: #a5e6bf; }
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--paper); }
::-webkit-scrollbar-thumb { border: 3px solid var(--paper); border-radius: 999px; background: #9fac9f; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
:focus-visible { outline: 3px solid rgba(67,189,121,.62); outline-offset: 4px; border-radius: 10px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 200; top: 12px; left: 12px; padding: 12px 18px; border-radius: 999px; color: #fff; background: var(--green-dark); transform: translateY(-150%); transition: transform .2s ease; }
.skip-link:focus { transform: translateY(0); }

.site-header { position: fixed; z-index: 100; top: 16px; left: 50%; width: min(1180px, calc(100vw - 32px)); min-height: 68px; padding: 10px 12px 10px 16px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; border: 1px solid transparent; border-radius: 24px; transform: translateX(-50%); transition: all .35s ease; }
.site-header.is-scrolled { top: 10px; border-color: rgba(38,70,49,.11); background: rgba(246,249,245,.82); box-shadow: 0 16px 50px rgba(33,54,41,.1); -webkit-backdrop-filter: blur(20px) saturate(140%); backdrop-filter: blur(20px) saturate(140%); }
.brand { width: max-content; display: inline-flex; align-items: center; gap: 11px; }
.brand > img { width: 40px; height: 40px; border-radius: 12px; box-shadow: 0 8px 24px rgba(67,189,121,.18); }
.brand > span { display: grid; gap: 1px; }
.brand b { font-size: 16px; letter-spacing: .03em; }
.brand small { color: #7b887f; font-size: 9px; text-transform: uppercase; letter-spacing: .13em; }
.desktop-nav { display: flex; gap: 32px; color: #536059; font-size: 14px; }
.desktop-nav a { position: relative; padding: 14px 0; transition: color .2s ease; }
.desktop-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 7px; height: 2px; border-radius: 999px; background: var(--green); transition: right .3s var(--ease); }
.desktop-nav a:hover { color: var(--ink); }
.desktop-nav a:hover::after { right: 0; }
.header-cta { justify-self: end; min-height: 44px; padding: 0 19px; display: inline-flex; align-items: center; justify-content: center; border-radius: 14px; color: var(--on-brand-action); background: var(--brand-action); box-shadow: 0 10px 26px rgba(79,190,114,.22); font-size: 14px; font-weight: 720; transition: transform .25s var(--ease), background .25s ease, box-shadow .25s ease; }
.header-cta:hover { background: var(--brand-action-hover); box-shadow: 0 14px 30px rgba(79,190,114,.3); transform: translateY(-2px); }
.menu-button, .mobile-nav { display: none; }
main { overflow: clip; }

.hero { position: relative; min-height: 780px; height: max(780px, 100svh); display: grid; grid-template-columns: minmax(350px,.82fr) minmax(570px,1.18fr); align-items: center; gap: 20px; padding: 112px max(24px, calc((100vw - 1180px)/2)) 62px; isolation: isolate; background: radial-gradient(circle at 77% 38%, rgba(67,189,121,.12), transparent 25rem), linear-gradient(180deg, #f7faf6, #eff5ee); }
.hero::before { content: ""; position: absolute; z-index: -2; inset: 0; opacity: .32; background-image: radial-gradient(rgba(42,89,57,.18) .7px, transparent .7px); background-size: 22px 22px; mask-image: linear-gradient(90deg, transparent 10%, #000 55%, transparent 100%); }
.hero-canvas { position: absolute; z-index: -1; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero-copy { position: relative; z-index: 6; }
.hero h1 { margin: 0; max-width: 8ch; color: #132019; font-size: clamp(67px, 6.2vw, 94px); font-weight: 760; line-height: .96; letter-spacing: -.068em; }
.hero-copy > p { max-width: 520px; margin: 31px 0 0; color: #56645c; font-size: clamp(16px,1.3vw,19px); line-height: 1.85; }
.hero-actions { display: flex; align-items: center; gap: 26px; margin-top: 38px; }
.primary-button { min-height: 56px; padding: 0 24px; display: inline-flex; align-items: center; justify-content: center; gap: 12px; border-radius: 17px; color: var(--on-brand-action); background: var(--brand-action); box-shadow: 0 14px 34px rgba(79,190,114,.22); font-size: 16px; font-weight: 720; transition: transform .3s var(--ease), box-shadow .3s ease, background .3s ease; }
.primary-button svg { width: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.primary-button:hover { background: var(--brand-action-hover); box-shadow: 0 18px 42px rgba(79,190,114,.3); transform: translateY(-3px); }
.text-link { padding: 10px 0 8px; border-bottom: 1px solid rgba(25,48,34,.3); color: #39483f; font-size: 15px; transition: border-color .2s ease; }
.text-link:hover { border-color: var(--green); }
.hero-signature { display: flex; align-items: center; gap: 11px; margin-top: 24px; color: #89958d; font-size: 12px; letter-spacing: .09em; }
.hero-signature span { width: 30px; height: 1px; background: #aeb8b1; }

.hero-stage { position: relative; width: min(720px,55vw); height: min(610px,76vh); min-height: 540px; justify-self: end; perspective: 1500px; transform-style: preserve-3d; }
.evidence-ribbon { position: absolute; z-index: 3; inset: 2% -5% -2% -8%; width: 113%; height: 100%; overflow: visible; pointer-events: none; }
.ribbon-shadow, .ribbon-line { fill: none; }
.ribbon-shadow { stroke: rgba(67,189,121,.1); stroke-width: 20; filter: blur(12px); }
.ribbon-line { stroke: url(#ribbonPaint); stroke-width: 3; stroke-linecap: round; stroke-dasharray: .02 .014; }
.ribbon-dot { fill: #7153c4; }
.hero-phone { position: absolute; z-index: 4; top: 0; left: 39%; width: min(258px,20vw); will-change: transform; transform: translate3d(calc(var(--px,0) * 14px),calc(var(--py,0) * 10px),80px) rotateY(-5deg) rotateZ(1.5deg); transition: transform .55s var(--ease); }
.hero-stage:hover .hero-phone { transform: translate3d(calc(var(--px,0) * 14px),calc(var(--py,0) * 10px - 7px),90px) rotateY(-2deg) rotateZ(.5deg); }
.phone-frame { position: relative; overflow: hidden; width: 100%; aspect-ratio: 786/1666; border-radius: 12.6%/6%; background: #0b0d0c; box-shadow: 0 34px 80px rgba(15,37,23,.3); }
.phone-frame img { width: 100%; height: 100%; object-fit: cover; object-position: center top; border-radius: inherit; }
.phone-frame::after { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; box-shadow: inset 0 0 0 1px rgba(255,255,255,.1); }
.dynamic-island { display: none; }
.quote, .insight { position: absolute; z-index: 5; display: grid; border: 1px solid rgba(43,86,57,.11); background: rgba(249,252,248,.83); box-shadow: 0 20px 48px rgba(31,73,44,.11); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); }
.quote { width: 210px; gap: 7px; padding: 14px 16px; border-radius: 17px; animation: float 5.5s ease-in-out infinite; }
.quote small { color: #73917e; font-size: 10px; }
.quote span { color: #304239; font-size: 12px; line-height: 1.55; }
.quote--one { left: 0; bottom: 19%; }
.quote--two { left: 13%; top: 13%; width: 185px; animation-delay: -2.7s; }
.insight { width: 210px; gap: 6px; padding: 15px 16px; border-radius: 18px; }
.insight i { width: max-content; padding: 4px 7px; border-radius: 7px; color: #845624; background: #fff0d7; font-size: 10px; font-style: normal; font-weight: 700; }
.insight strong { color: #263a2f; font-size: 13px; }
.insight span { color: #7c8a81; font-size: 10px; }
.insight--risk { right: 0; top: 20%; }
.insight--missing { right: 3%; bottom: 13%; animation: float 6s ease-in-out infinite -3s; }
.insight--missing i { color: #6449a4; background: #eee8fa; }
.hero-zhizi { position: absolute; z-index: 6; right: 9%; top: 2%; width: 82px; filter: drop-shadow(0 14px 25px rgba(41,91,58,.17)); animation: zhizi 6s ease-in-out infinite; }
@keyframes float { 50% { transform: translateY(-9px); } }
@keyframes zhizi { 50% { transform: translate(4px,-10px) rotate(2deg); } }
.scroll-cue { position: absolute; z-index: 8; bottom: 24px; left: 50%; display: grid; justify-items: center; gap: 3px; color: #87938b; font-size: 10px; letter-spacing: .15em; transform: translateX(-50%); }
.scroll-cue svg { width: 22px; fill: none; stroke: currentColor; stroke-width: 1.5; animation: cue 1.8s ease-in-out infinite; }
@keyframes cue { 50% { color: var(--green-dark); transform: translateY(5px); } }

.position { width: var(--shell); min-height: 620px; margin: 0 auto; padding: 120px 0; display: grid; grid-template-columns: .25fr 1.75fr; align-items: start; gap: 75px; }
.position-index { padding-top: 12px; color: #a0aca4; font-size: 14px; font-variant-numeric: tabular-nums; }
.position h2, .how h2, .evidence h2, .scenes h2, .story h2, .boundary h2, .closing h2 { margin: 0; font-size: clamp(42px,4.65vw,68px); line-height: 1.07; letter-spacing: -.055em; font-weight: 720; }
.position-copy p { max-width: 760px; margin: 38px 0 0 auto; color: var(--muted); font-size: 18px; line-height: 1.95; }

.how { position: relative; padding: 130px 0 160px; color: #f5f8f5; background: var(--night); }
.how::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 340px; opacity: .2; background: radial-gradient(circle at 70% 0, rgba(67,189,121,.38), transparent 40%); }
.how-heading { position: relative; width: var(--shell); margin: 0 auto 80px; display: grid; grid-template-columns: .4fr 1.6fr; gap: 72px; }
.how-heading > span, .scenes-heading > span { color: #76a488; font-size: 13px; letter-spacing: .1em; }
.how-shell { position: relative; width: var(--shell); min-height: 1050px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 95px; }
.how-visual { position: sticky; top: 115px; align-self: start; height: 700px; overflow: hidden; display: grid; place-items: center; border: 1px solid rgba(172,205,182,.1); border-radius: var(--radius-l); background: radial-gradient(circle at 50% 42%, #253b31, #111d18 55%, #0a120e); }
.how-phone { position: relative; z-index: 3; width: 274px; transition: opacity .3s ease, transform .6s var(--ease); }
.how-phone.is-changing { opacity: .08; transform: translateY(20px) scale(.97); }
.how-signal { position: absolute; width: 510px; height: 510px; border: 1px solid rgba(91,201,138,.18); border-radius: 50%; animation: pulse 5s ease-in-out infinite; }
.how-signal::before, .how-signal::after { content: ""; position: absolute; border: 1px solid rgba(91,201,138,.08); border-radius: 50%; }
.how-signal::before { inset: 55px; }
.how-signal::after { inset: 115px; }
.how-signal i { position: absolute; width: 9px; height: 9px; border-radius: 50%; background: var(--green); box-shadow: 0 0 20px var(--green); }
.how-signal i:nth-child(1) { top: 15%; left: 14%; }
.how-signal i:nth-child(2) { right: 4%; top: 52%; }
.how-signal i:nth-child(3) { bottom: 6%; left: 32%; background: var(--violet); box-shadow: 0 0 18px var(--violet); }
@keyframes pulse { 50% { transform: scale(1.05); opacity: .72; } }
.how-label { position: absolute; z-index: 5; right: 22px; bottom: 22px; min-width: 140px; padding: 13px 15px; display: grid; gap: 4px; border: 1px solid rgba(255,255,255,.1); border-radius: 15px; background: rgba(7,13,10,.65); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); }
.how-label span { color: #72937f; font-size: 10px; }
.how-label b { color: #eaf1ec; font-size: 13px; }
.how-steps { padding: 55px 0 100px; }
.how-step { position: relative; min-height: 245px; padding: 30px 26px 38px 44px; border-left: 2px solid rgba(151,184,162,.16); color: #8e9b93; opacity: 1; transition: border-color .35s ease, transform .45s var(--ease); }
.how-step::before { content: ""; position: absolute; top: 37px; left: -7px; width: 12px; height: 12px; border: 2px solid var(--night); border-radius: 50%; background: #435349; transition: all .3s ease; }
.how-step > span { color: #6d7e73; font-size: 12px; letter-spacing: .13em; }
.how-step h3 { margin: 16px 0 13px; color: #ecf2ee; font-size: clamp(26px,2.4vw,35px); line-height: 1.25; letter-spacing: -.036em; }
.how-step p { max-width: 500px; margin: 0; font-size: 16px; line-height: 1.82; }
.how-step.is-active { border-color: var(--green); opacity: 1; transform: translateX(10px); }
.how-step.is-active::before { background: var(--green); box-shadow: 0 0 0 7px rgba(67,189,121,.13); }

.evidence { padding: 150px 0 160px; background: #eef3ed; }
.evidence-heading { width: var(--shell); margin: 0 auto 72px; display: grid; grid-template-columns: 1fr .82fr; align-items: end; gap: 80px; }
.evidence-heading p { margin: 0; color: var(--muted); font-size: 17px; line-height: 1.85; }
.evidence-demo { width: var(--shell); min-height: 290px; margin: 0 auto; padding: 36px 42px; display: grid; grid-template-columns: 1fr 260px 1fr; align-items: center; gap: 28px; overflow: hidden; border: 1px solid var(--line); border-radius: 34px; background: rgba(255,255,255,.67); box-shadow: 0 24px 70px rgba(36,70,48,.08); }
.transcript { display: grid; gap: 11px; }
.transcript > span { color: #779080; font-size: 11px; font-variant-numeric: tabular-nums; }
.transcript p { margin: 0; font-size: 18px; font-weight: 620; line-height: 1.6; }
.transcript button { width: max-content; min-height: 44px; padding: 8px 0 4px; border: 0; border-bottom: 1px solid var(--green); color: var(--green-dark); background: none; font-size: 12px; cursor: pointer; }
.evidence-demo svg { width: 100%; overflow: visible; }
.evidence-demo svg path { fill: none; stroke: #64c78e; stroke-width: 2; stroke-dasharray: 5 7; }
.evidence-demo svg circle { fill: var(--violet); }
.evidence-card { padding: 22px; display: grid; gap: 9px; border: 1px solid rgba(56,110,74,.12); border-radius: 22px; background: #fff; box-shadow: 0 16px 40px rgba(43,82,56,.1); transition: transform .5s var(--ease), box-shadow .5s ease; }
.evidence-demo.is-emphasized .evidence-card { transform: translateY(-8px) scale(1.02); box-shadow: 0 24px 55px rgba(43,82,56,.16); }
.evidence-card small { color: #9a702c; font-size: 10px; }
.evidence-card strong { font-size: 17px; }
.evidence-card p { margin: 0; color: #647169; font-size: 13px; line-height: 1.6; }
.evidence-card span { color: #8b978f; font-size: 10px; }
.principles { width: var(--shell); margin: 70px auto 0; display: grid; grid-template-columns: repeat(3,1fr); gap: 30px; }
.principles article { padding-top: 25px; border-top: 1px solid rgba(45,82,57,.2); }
.principles span { color: var(--green-dark); font-size: 11px; font-variant-numeric: tabular-nums; }
.principles h3 { margin: 21px 0 12px; font-size: 22px; }
.principles p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }

.scenes { padding: 140px 0 155px; background: #fafbf8; }
.scenes-heading { width: var(--shell); margin: 0 auto 55px; display: grid; grid-template-columns: .4fr 1.6fr; gap: 72px; }
.scenes-heading > span { color: #708079; }
.scene-tabs { width: var(--shell); margin: 0 auto 30px; display: flex; gap: 8px; }
.scene-tabs button { min-height: 44px; padding: 0 18px; border: 1px solid var(--line); border-radius: 14px; color: #6d7a72; background: transparent; cursor: pointer; transition: all .25s ease; }
.scene-tabs button.is-active { border-color: var(--brand-action); color: var(--on-brand-action); background: var(--brand-action); font-weight: 700; }
.scene-panel { width: var(--shell); min-height: 620px; margin: 0 auto; padding: 72px 90px; display: grid; grid-template-columns: 1fr .8fr; align-items: center; gap: 80px; overflow: hidden; border-radius: var(--radius-l); color: #f1f6f2; background: radial-gradient(circle at 73% 35%, rgba(70,190,120,.24), transparent 20rem), #13231a; }
.scene-copy { transition: opacity .25s ease, transform .35s var(--ease); }
.scene-panel.is-changing .scene-copy, .scene-panel.is-changing .scene-phone { opacity: 0; transform: translateY(14px); }
.scene-copy h3 { margin: 0; max-width: 14ch; font-size: clamp(34px,3.7vw,53px); line-height: 1.12; letter-spacing: -.045em; }
.scene-copy > p { max-width: 520px; margin: 24px 0 0; color: #a5b5aa; font-size: 16px; line-height: 1.85; }
.scene-copy ul { display: grid; gap: 13px; margin: 30px 0 0; padding: 0; list-style: none; color: #cbd7cf; font-size: 14px; }
.scene-copy li { display: flex; align-items: center; gap: 10px; }
.scene-copy li::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 5px rgba(67,189,121,.12); }
.scene-phone { width: 278px; justify-self: center; transform: rotate(3deg); transition: opacity .25s ease, transform .45s var(--ease); }

.story { position: relative; min-height: 760px; display: grid; grid-template-columns: .8fr 1.2fr; align-items: center; gap: 100px; padding: 130px max(24px,calc((100vw - 1040px)/2)); background: #dff2e6; overflow: hidden; }
.story::before { content: ""; position: absolute; left: -260px; bottom: -310px; width: 720px; height: 720px; border: 1px solid rgba(34,117,69,.12); border-radius: 50%; box-shadow: 0 0 0 80px rgba(34,117,69,.025), 0 0 0 170px rgba(34,117,69,.018); }
.story-zhizi { position: relative; z-index: 2; width: 330px; justify-self: center; filter: drop-shadow(0 28px 40px rgba(40,97,59,.18)); animation: zhizi 6s ease-in-out infinite; }
.story-copy { position: relative; z-index: 2; }
.story-copy p { max-width: 650px; margin: 31px 0 0; color: #52675a; font-size: 17px; line-height: 1.95; }

.boundary { width: var(--shell); min-height: 720px; margin: 0 auto; display: grid; grid-template-columns: .45fr 1.1fr .8fr; align-items: center; gap: 65px; padding: 130px 0; }
.boundary-mark { position: relative; width: 150px; height: 150px; border: 1px solid #b5c9ba; border-radius: 50%; }
.boundary-mark::before { content: ""; position: absolute; inset: 28px; border: 1px solid #92b29d; border-radius: 50%; }
.boundary-mark span { position: absolute; left: 50%; width: 9px; height: 9px; border-radius: 50%; background: var(--green); box-shadow: 0 0 16px rgba(67,189,121,.55); transform-origin: 0 75px; }
.boundary-mark span:nth-child(1) { top: -5px; }
.boundary-mark span:nth-child(2) { top: 70px; left: -5px; }
.boundary-mark span:nth-child(3) { right: -5px; bottom: 28px; left: auto; background: var(--violet); }
.boundary-copy p { max-width: 560px; margin: 28px 0 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.boundary-list { display: grid; }
.boundary-list p { margin: 0; padding: 18px 0; border-bottom: 1px solid var(--line); color: #69766e; font-size: 14px; }
.boundary-list span { display: inline-block; min-width: 84px; color: var(--green-dark); font-weight: 700; }

.closing { position: relative; min-height: 700px; padding: 130px 24px; display: grid; place-items: center; overflow: hidden; text-align: center; color: #f3f8f4; background: #112018; }
.closing > img { border-radius: 28px; box-shadow: 0 24px 60px rgba(42,152,86,.22); }
.closing-copy { position: relative; z-index: 2; margin-top: 32px; }
.closing-copy p { margin: 25px 0 0; color: #a9b8ae; font-size: 17px; }
.closing-copy .primary-button { margin-top: 34px; color: var(--on-brand-action); background: var(--brand-action); box-shadow: 0 15px 42px rgba(79,190,114,.25); }
.closing-copy .primary-button:hover { background: var(--brand-action-hover); }
.closing-rings { position: absolute; width: 860px; height: 860px; border: 1px solid rgba(92,199,135,.11); border-radius: 50%; }
.closing-rings::before, .closing-rings::after { content: ""; position: absolute; border: 1px solid rgba(92,199,135,.07); border-radius: 50%; }
.closing-rings::before { inset: 95px; }
.closing-rings::after { inset: 210px; }
.closing-rings i { position: absolute; width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 20px var(--green); animation: orbitGlow 4s ease-in-out infinite; }
.closing-rings i:nth-child(1) { top: 11%; left: 26%; }
.closing-rings i:nth-child(2) { right: 0; top: 49%; animation-delay: -1.4s; }
.closing-rings i:nth-child(3) { bottom: 8%; left: 28%; background: var(--violet); animation-delay: -2.8s; }
@keyframes orbitGlow { 50% { transform: scale(1.7); opacity: .45; } }

.site-footer { width: var(--shell); margin: 0 auto; padding: 48px 0 36px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 34px 50px; border-top: 1px solid var(--line); }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand > img { border-radius: 11px; }
.footer-brand div { display: grid; gap: 4px; }
.footer-brand strong { font-size: 15px; }
.footer-brand span { color: #829087; font-size: 11px; }
.footer-links { display: flex; gap: 28px; color: #69776e; font-size: 13px; }
.footer-links a:hover, .footer-legal a:hover { color: var(--green-dark); }
.footer-legal { grid-column: 1/-1; padding-top: 25px; display: flex; align-items: center; flex-wrap: wrap; gap: 6px 24px; border-top: 1px solid rgba(31,60,43,.09); color: #849087; font-size: 12px; }
.footer-legal a { min-height: 44px; display: inline-flex; align-items: center; }
.security-record { gap: 7px; }
.security-record img { width: 18px; height: 20px; object-fit: contain; }
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .85s var(--ease), transform .85s var(--ease); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1100px) {
  :root { --shell: min(100% - 40px,960px); }
  .site-header { grid-template-columns: 1fr auto; }
  .desktop-nav { display: none; }
  .header-cta { margin-right: 50px; }
  .menu-button { position: absolute; right: 14px; width: 42px; height: 42px; display: grid; place-content: center; gap: 6px; border: 0; border-radius: 13px; background: rgba(25,67,43,.07); cursor: pointer; }
  .menu-button span { width: 18px; height: 1px; background: currentColor; transition: transform .25s ease; }
  .menu-button[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-button[aria-expanded="true"] span:nth-child(2) { transform: translateY(-3.5px) rotate(-45deg); }
  .mobile-nav { position: absolute; top: 76px; right: 0; left: 0; padding: 12px; display: grid; gap: 4px; border: 1px solid var(--line); border-radius: 20px; background: rgba(248,251,247,.97); box-shadow: var(--shadow); opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all .25s ease; }
  .mobile-nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .mobile-nav a { padding: 13px 14px; border-radius: 12px; color: #4f5d54; }
  .mobile-nav a:hover { color: var(--ink); background: rgba(32,71,45,.06); }
  .hero { grid-template-columns: .8fr 1.2fr; }
  .hero-stage { width: 55vw; }
  .hero-phone { width: 21vw; left: 35%; }
  .how-shell { gap: 55px; }
  .evidence-demo { grid-template-columns: 1fr 180px 1fr; padding-inline: 30px; }
  .boundary { grid-template-columns: .3fr 1fr .75fr; gap: 35px; }
}

@media (max-width: 820px) {
  :root { --shell: calc(100vw - 36px); }
  .brand > img { width: 36px; height: 36px; }
  .header-cta { display: none; }
  .hero { height: auto; min-height: 990px; grid-template-columns: 1fr; align-content: start; gap: 34px; padding: 128px 18px 90px; }
  .hero-copy { text-align: center; }
  .hero h1 { max-width: none; font-size: clamp(56px,15vw,76px); }
  .hero-copy > p { max-width: 560px; margin: 24px auto 0; font-size: 16px; }
  .hero-actions { justify-content: center; margin-top: 30px; }
  .hero-signature { justify-content: center; }
  .hero-stage { width: min(600px,100%); height: 520px; min-height: 520px; justify-self: center; }
  .hero-phone { width: 210px; left: calc(50% - 110px); }
  .quote { width: 180px; }
  .quote--one { left: 0; }
  .quote--two { left: 2%; top: 9%; }
  .insight { width: 180px; }
  .insight--risk { right: 0; }
  .insight--missing { right: 1%; bottom: 9%; }
  .hero-zhizi { right: 8%; top: 0; width: 67px; }
  .scroll-cue { display: none; }
  .position { min-height: auto; grid-template-columns: 1fr; gap: 35px; padding: 100px 0 120px; }
  .position h2, .how h2, .evidence h2, .scenes h2, .story h2, .boundary h2, .closing h2 { font-size: clamp(40px,11vw,55px); }
  .position-copy p { margin-top: 28px; font-size: 16px; }
  .how { padding: 105px 0 120px; }
  .how-heading, .scenes-heading { grid-template-columns: 1fr; gap: 24px; margin-bottom: 50px; }
  .how-shell { min-height: auto; grid-template-columns: 1fr; gap: 42px; }
  .how-visual { position: relative; top: auto; height: 620px; }
  .how-phone { width: 240px; }
  .how-steps { padding: 0; }
  .how-step { min-height: 220px; padding: 30px 15px 34px 35px; }
  .how-step.is-active { transform: translateX(4px); }
  .evidence { padding: 110px 0 120px; }
  .evidence-heading { display: block; margin-bottom: 45px; }
  .evidence-heading p { margin-top: 22px; font-size: 16px; }
  .evidence-demo { grid-template-columns: 1fr; gap: 28px; padding: 30px 24px; }
  .evidence-demo svg { height: 95px; transform: rotate(90deg); }
  .principles { grid-template-columns: 1fr; gap: 35px; }
  .scenes { padding: 105px 0 120px; }
  .scene-panel { min-height: auto; grid-template-columns: 1fr; padding: 60px 35px; gap: 55px; }
  .scene-phone { width: 240px; grid-row: 1; }
  .story { min-height: auto; grid-template-columns: 1fr; gap: 60px; padding: 110px 24px 120px; }
  .story-zhizi { width: 250px; }
  .story-copy p { font-size: 16px; }
  .boundary { min-height: auto; grid-template-columns: 1fr; gap: 38px; padding: 110px 0; }
  .boundary-mark { width: 95px; height: 95px; }
  .boundary-mark::before { inset: 19px; }
  .boundary-copy p { font-size: 16px; }
  .closing { min-height: 680px; }
  .site-footer { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
}

@media (max-width: 520px) {
  :root { --shell: calc(100vw - 28px); }
  .site-header { top: 9px; width: calc(100vw - 18px); padding-left: 12px; border-radius: 20px; }
  .hero { min-height: 920px; padding-inline: 14px; }
  .hero-copy > p { max-width: 345px; line-height: 1.75; }
  .hero-actions { flex-direction: column; gap: 10px; }
  .primary-button { width: 100%; max-width: 330px; }
  .hero-stage { height: 455px; min-height: 455px; }
  .hero-phone { width: 174px; left: calc(50% - 93px); }
  .quote, .insight { width: 148px; padding: 10px 11px; border-radius: 13px; }
  .quote span { font-size: 10px; }
  .insight strong { font-size: 10px; }
  .quote--one { bottom: 13%; }
  .quote--two { top: 11%; }
  .insight--risk { top: 18%; }
  .insight--missing { bottom: 7%; }
  .hero-zhizi { right: 4%; width: 54px; }
  .how-visual { height: 540px; border-radius: 28px; }
  .how-phone { width: 207px; }
  .how-signal { width: 370px; height: 370px; }
  .how-label { right: 12px; bottom: 12px; }
  .how-step h3 { font-size: 26px; }
  .evidence-demo { border-radius: 27px; }
  .scene-tabs { overflow-x: auto; }
  .scene-tabs button { flex: 0 0 auto; }
  .scene-panel { padding: 42px 22px 55px; border-radius: 28px; }
  .scene-phone { width: 210px; }
  .story { padding-inline: 18px; }
  .story-zhizi { width: 210px; }
  .closing > img { width: 82px; height: 82px; }
  .footer-legal { display: grid; gap: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}