:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --bg-deep: #eaf0f8;
  --surface: rgba(255, 255, 255, 0.58);
  --surface-strong: rgba(255, 255, 255, 0.82);
  --surface-hover: rgba(255, 255, 255, 0.74);
  --text: #101318;
  --text-soft: #5d6571;
  --text-faint: #87909c;
  --line: rgba(35, 48, 68, 0.11);
  --line-bright: rgba(255, 255, 255, 0.76);
  --blue: #0878f9;
  --blue-bright: #36a0ff;
  --cyan: #76d8ff;
  --violet: #818cf8;
  --green: #28b879;
  --shadow: 0 24px 64px rgba(51, 76, 112, 0.12), 0 3px 14px rgba(51, 76, 112, 0.06);
  --shadow-hover: 0 32px 80px rgba(43, 73, 119, 0.18), 0 8px 24px rgba(43, 73, 119, 0.1);
  --radius-xl: 2rem;
  --radius-lg: 1.5rem;
  --radius-md: 1rem;
  --page: min(1180px, calc(100% - 48px));
  --ease: cubic-bezier(.2, .8, .2, 1);
  --ease-spring: cubic-bezier(.16, 1, .3, 1);
  --header-height: 64px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #05080e;
  --bg-deep: #07111f;
  --surface: rgba(17, 25, 39, 0.54);
  --surface-strong: rgba(15, 24, 39, 0.82);
  --surface-hover: rgba(26, 39, 59, 0.72);
  --text: #f5f7fb;
  --text-soft: #a3adbb;
  --text-faint: #697588;
  --line: rgba(166, 205, 255, 0.12);
  --line-bright: rgba(194, 222, 255, 0.16);
  --blue: #3c9cff;
  --blue-bright: #68b8ff;
  --cyan: #5bd5ff;
  --violet: #9aa4ff;
  --green: #48d59a;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.36), 0 0 30px rgba(45, 134, 255, 0.06);
  --shadow-hover: 0 36px 90px rgba(0, 0, 0, 0.46), 0 0 40px rgba(45, 134, 255, 0.13);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 24px); }
body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 500ms var(--ease), color 400ms var(--ease);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -5;
  pointer-events: none;
  background-image: radial-gradient(circle at 50% 0%, rgba(75, 153, 255, .08), transparent 38%);
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; font: inherit; }
svg { display: block; }
::selection { color: #fff; background: rgba(0, 113, 227, .76); }
:focus-visible { outline: 3px solid color-mix(in srgb, var(--blue) 52%, transparent); outline-offset: 4px; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 200; padding: .65rem 1rem; border-radius: .8rem; background: var(--text); color: var(--bg); transition: top 160ms ease-out; }
.skip-link:focus { top: 1rem; }
.page-width { width: var(--page); margin-inline: auto; }
.section { padding: 8.5rem 0; position: relative; }
.eyebrow { margin: 0 0 1rem; color: var(--blue); font-size: .75rem; font-weight: 700; letter-spacing: .13em; line-height: 1.2; text-transform: uppercase; }
.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; }

/* Header */
.site-header { position: fixed; inset: 0 0 auto; z-index: 100; height: var(--header-height); transition: background-color 240ms ease-out, box-shadow 240ms ease-out, backdrop-filter 240ms ease-out; }
.site-header::after { content: ""; position: absolute; inset: auto 0 -15px; height: 16px; pointer-events: none; opacity: 0; background: linear-gradient(to bottom, rgba(10,20,35,.08), transparent); filter: blur(4px); transition: opacity 220ms ease-out; }
.site-header.is-scrolled { background: color-mix(in srgb, var(--surface-strong) 84%, transparent); backdrop-filter: blur(24px) saturate(170%); -webkit-backdrop-filter: blur(24px) saturate(170%); box-shadow: inset 0 -1px var(--line-bright); }
.site-header.is-scrolled::after { opacity: .45; }
.nav-shell { position: relative; width: var(--page); height: 100%; margin: auto; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; }
.brand { display: inline-flex; align-items: center; width: max-content; gap: .55rem; font-size: .94rem; font-weight: 650; letter-spacing: -.015em; }
.brand-mark { width: 25px; height: 25px; overflow: visible; fill: currentColor; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.nav-links { display: flex; align-items: center; gap: .25rem; padding: .25rem; border: 1px solid transparent; border-radius: 999px; }
.nav-links a { position: relative; padding: .45rem .78rem; color: var(--text-soft); font-size: .78rem; font-weight: 550; transition: color 180ms ease-out, background-color 180ms ease-out; }
.nav-links a::after { content: ""; position: absolute; left: .78rem; right: .78rem; bottom: .22rem; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform 220ms var(--ease); }
.nav-links a:hover, .nav-links a.is-active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.is-active::after { transform: scaleX(1); transform-origin: left; }
.nav-actions { justify-self: end; display: flex; align-items: center; gap: .55rem; }
.theme-toggle { position: relative; display: grid; place-items: center; width: 38px; height: 38px; padding: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 50%; background: var(--surface); box-shadow: inset 0 1px var(--line-bright); cursor: pointer; backdrop-filter: blur(16px) saturate(160%); transition: transform 180ms ease-out, border-color 180ms ease-out, background-color 300ms ease-out; }
.theme-toggle:hover { transform: translateY(-1px); border-color: color-mix(in srgb, var(--blue) 40%, var(--line)); }
.theme-toggle:active { transform: scale(.94); transition-duration: 100ms; }
.theme-icon { position: absolute; width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; transition: transform 360ms var(--ease-spring), opacity 220ms ease-out; }
.theme-icon-moon { opacity: 0; transform: translateY(17px) rotate(22deg); }
[data-theme="dark"] .theme-icon-sun { opacity: 0; transform: translateY(-17px) rotate(-36deg); }
[data-theme="dark"] .theme-icon-moon { opacity: 1; transform: translateY(0) rotate(0); }
.menu-toggle { display: none; }

/* Buttons */
.button { position: relative; isolation: isolate; display: inline-flex; align-items: center; justify-content: center; gap: .45rem; min-height: 48px; padding: .72rem 1.25rem; overflow: hidden; border: 1px solid transparent; border-radius: 999px; font-size: .88rem; font-weight: 650; line-height: 1; transition: transform 180ms var(--ease-spring), box-shadow 220ms ease-out, border-color 220ms ease-out, color 220ms ease-out, background-color 220ms ease-out; }
.button::before { content: ""; position: absolute; z-index: -1; inset: -2px; opacity: 0; background: linear-gradient(110deg, transparent 25%, rgba(255,255,255,.5) 48%, transparent 72%); transform: translateX(-70%); transition: transform 700ms var(--ease), opacity 200ms ease-out; }
.button:hover { transform: translateY(-2px) scale(1.015); }
.button:hover::before { opacity: 1; transform: translateX(70%); }
.button:active { transform: scale(.97); transition-duration: 100ms; }
.button svg, .back-link svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; transition: transform 180ms ease-out; }
.button:hover svg { transform: translateX(2px); }
.button-primary { color: #fff; background: linear-gradient(110deg, #006ddb, #0d8cff 55%, #0878f9); background-size: 180% 180%; box-shadow: 0 10px 28px rgba(0,113,227,.26), inset 0 1px rgba(255,255,255,.3); }
.button-primary:hover { box-shadow: 0 15px 36px rgba(0,113,227,.34), 0 0 24px rgba(72,178,255,.16), inset 0 1px rgba(255,255,255,.38); background-position: 100% 50%; }
.button-secondary { border-color: var(--line); background: var(--surface); box-shadow: inset 0 1px var(--line-bright); backdrop-filter: blur(16px); }
.button-small { min-height: 36px; padding: .55rem .9rem; font-size: .76rem; }
.button-quiet { color: var(--blue); padding-inline: .8rem; }
.button-quiet:hover { background: color-mix(in srgb, var(--blue) 8%, transparent); }

/* Hero */
.hero { position: relative; min-height: max(720px, 100svh); display: grid; align-items: center; padding: calc(var(--header-height) + 5.5rem) 0 5rem; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, .92fr) minmax(440px, 1.08fr); align-items: center; gap: clamp(2rem, 5vw, 6rem); }
.hero-copy { position: relative; z-index: 3; padding-bottom: 1.5rem; }
.hero-title { max-width: 700px; margin: 0; color: var(--text); font-size: clamp(3.15rem, 5.3vw, 5rem); font-weight: 720; letter-spacing: -.055em; line-height: 1.04; }
.hero-title span { color: var(--text-soft); font-weight: 620; }
.hero-title .headline-nowrap { color: inherit; font-weight: inherit; white-space: nowrap; }
.hero-lead { max-width: 34rem; margin: 1.65rem 0 0; color: var(--text-soft); font-size: clamp(1rem, 1.4vw, 1.16rem); letter-spacing: -.01em; line-height: 1.75; }
.hero-actions { display: flex; gap: .6rem; margin-top: 2rem; }
.hero-notes { display: flex; flex-wrap: wrap; gap: .8rem 1.3rem; margin-top: 2.25rem; color: var(--text-faint); font-size: .74rem; font-weight: 550; letter-spacing: .025em; }
.hero-notes span { display: inline-flex; align-items: center; gap: .45rem; }
.hero-notes i { width: 5px; height: 5px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 10px var(--blue); }
.hero-sequence { opacity: 0; transform: translateY(18px); animation: hero-enter 800ms var(--ease-spring) forwards; }
.hero-sequence:nth-child(2) { animation-delay: 80ms; }
.hero-sequence:nth-child(3) { animation-delay: 160ms; }
.hero-sequence:nth-child(4) { animation-delay: 240ms; }
.hero-sequence:nth-child(5) { animation-delay: 320ms; }
@keyframes hero-enter { to { opacity: 1; transform: translateY(0); } }
.ambient { position: absolute; pointer-events: none; border-radius: 50%; filter: blur(10px); opacity: .9; }
.ambient-one { width: min(52vw, 720px); aspect-ratio: 1; right: -12%; top: 4%; background: radial-gradient(circle, rgba(60,157,255,.18), rgba(116,194,255,.07) 44%, transparent 70%); animation: ambient-drift 18s ease-in-out infinite alternate; }
.ambient-two { width: min(36vw, 520px); aspect-ratio: 1; left: -12%; bottom: -17%; background: radial-gradient(circle, rgba(133,151,255,.13), transparent 67%); animation: ambient-drift 24s ease-in-out -7s infinite alternate-reverse; }
[data-theme="dark"] .ambient-one { background: radial-gradient(circle, rgba(24,125,255,.25), rgba(21,78,161,.11) 46%, transparent 72%); }
[data-theme="dark"] .ambient-two { background: radial-gradient(circle, rgba(63,70,213,.16), transparent 67%); }
@keyframes ambient-drift { from { transform: translate3d(-1.5%, -1%, 0) scale(.96); } to { transform: translate3d(2.5%, 2%, 0) scale(1.05); } }

.hero-visual { position: relative; height: clamp(450px, 55vw, 640px); display: grid; place-items: center; perspective: 1200px; }
.product-aura { position: absolute; width: 76%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle, rgba(97,184,255,.36), rgba(91,143,238,.12) 43%, transparent 68%); filter: blur(12px); animation: aura-pulse 8s ease-in-out infinite; }
@keyframes aura-pulse { 50% { opacity: .72; transform: scale(1.06); } }
.product-ring { position: absolute; border: 1px solid color-mix(in srgb, var(--blue) 18%, transparent); border-radius: 50%; transform: rotateX(68deg) rotateZ(-10deg); }
.product-ring-one { width: 88%; aspect-ratio: 1.7; }
.product-ring-two { width: 64%; aspect-ratio: 1.5; opacity: .56; }
.usb-device { position: relative; z-index: 2; width: 184px; height: 390px; transform: rotateZ(31deg) rotateX(-4deg) rotateY(-12deg); transform-style: preserve-3d; filter: drop-shadow(0 45px 34px rgba(36,59,96,.2)); transition: transform 100ms linear; }
.usb-connector { position: absolute; left: 50%; top: 0; width: 72px; height: 92px; transform: translateX(-50%) translateZ(-4px); border-radius: 8px 8px 2px 2px; background: linear-gradient(90deg, #8e98a5, #f8fbff 22%, #aeb7c2 52%, #f6f9fc 75%, #7f8996); box-shadow: inset 0 0 0 1px rgba(40,50,65,.18), inset 0 10px 18px rgba(255,255,255,.5); }
.usb-connector::before { content: ""; position: absolute; inset: 13px 11px 19px; border-radius: 4px; background: linear-gradient(#f2f5f8, #78838e); box-shadow: inset 0 0 0 1px rgba(0,0,0,.16); }
.contact { position: absolute; z-index: 2; top: 24px; width: 12px; height: 29px; border-radius: 2px; background: linear-gradient(90deg, #c99c2f, #ffeaa0, #b98214); }
.contact-one { left: 21px; }.contact-two { right: 21px; }
.usb-neck { position: absolute; z-index: 2; left: 50%; top: 80px; width: 96px; height: 38px; transform: translateX(-50%); border-radius: 12px 12px 3px 3px; background: linear-gradient(90deg, #94a0ae, #f3f7fc 48%, #a2adbb); box-shadow: 0 -2px 8px rgba(0,0,0,.1); }
.usb-body { position: absolute; z-index: 3; inset: 103px 0 0; overflow: hidden; border: 1px solid rgba(255,255,255,.55); border-radius: 30px 30px 38px 38px; background: linear-gradient(115deg, #6d7c8e 0%, #f8fbff 18%, #a9b7c7 43%, #edf4fb 64%, #718195 100%); box-shadow: inset 0 1px 1px white, inset -12px -12px 28px rgba(43,57,76,.18), 0 24px 50px rgba(41,72,112,.22); }
.usb-body::before { content: ""; position: absolute; inset: 2px; border-radius: inherit; border: 1px solid rgba(255,255,255,.45); }
.usb-reflection { position: absolute; width: 56px; height: 130%; top: -15%; left: 8%; transform: rotate(14deg); background: linear-gradient(90deg, transparent, rgba(255,255,255,.62), transparent); filter: blur(5px); animation: product-shine 7s ease-in-out infinite; }
@keyframes product-shine { 0%, 15% { transform: translateX(-70px) rotate(14deg); opacity: 0; } 35% { opacity: .8; } 55%, 100% { transform: translateX(200px) rotate(14deg); opacity: 0; } }
.usb-brand { position: absolute; top: 112px; left: 0; right: 0; display: flex; flex-direction: column; align-items: center; gap: .3rem; color: rgba(26,37,51,.68); }
.usb-brand svg { width: 31px; height: 31px; fill: currentColor; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.usb-brand span { font-size: .58rem; font-weight: 800; letter-spacing: .2em; }
.usb-body > p { position: absolute; left: 0; right: 0; bottom: 26px; margin: 0; color: rgba(31,44,61,.48); text-align: center; font-size: .44rem; font-weight: 700; letter-spacing: .22em; }
.usb-led { position: absolute; left: 50%; bottom: 58px; width: 5px; height: 5px; transform: translateX(-50%); border-radius: 50%; background: #2b98ff; box-shadow: 0 0 12px 3px rgba(43,152,255,.58); animation: led-breathe 3.2s ease-in-out infinite; }
@keyframes led-breathe { 50% { opacity: .45; box-shadow: 0 0 5px 1px rgba(43,152,255,.35); } }
.usb-shadow { position: absolute; z-index: 1; bottom: 14%; left: 22%; width: 62%; height: 12%; border-radius: 50%; background: rgba(28,49,78,.18); filter: blur(24px); transform: rotate(-10deg); }
.product-caption { position: absolute; z-index: 3; right: 4%; bottom: 10%; display: flex; flex-direction: column; padding-left: .9rem; border-left: 1px solid var(--line); color: var(--text); }
.product-caption span { font-size: .75rem; font-weight: 650; }.product-caption small { margin-top: .14rem; color: var(--text-faint); font-size: .65rem; }
.scroll-cue { position: absolute; left: 50%; bottom: 1.6rem; width: 26px; height: 42px; display: grid; place-items: start center; padding-top: 8px; transform: translateX(-50%); border: 1px solid var(--line); border-radius: 999px; }
.scroll-cue span { width: 3px; height: 7px; border-radius: 4px; background: var(--text-faint); animation: scroll-cue 2s ease-in-out infinite; }
@keyframes scroll-cue { 70%,100% { transform: translateY(17px); opacity: 0; } }

/* Sections and cards */
.section-heading { max-width: 720px; margin-bottom: 3.2rem; }
.section-heading h2, .continuity-copy h2, .final-cta h2, .contact-inner h2 { margin: 0; font-size: clamp(2.35rem, 4.4vw, 4rem); line-height: 1.08; letter-spacing: -.045em; }
.section-heading > p:last-child { max-width: 34rem; margin: 1.2rem 0 0; color: var(--text-soft); font-size: 1.02rem; }
.highlights { background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--bg-deep) 58%, transparent) 42%, transparent); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.glass-card { position: relative; isolation: isolate; overflow: hidden; border: 1px solid var(--line); background: linear-gradient(145deg, var(--surface-hover), var(--surface)); box-shadow: var(--shadow), inset 0 1px var(--line-bright); backdrop-filter: blur(24px) saturate(155%); -webkit-backdrop-filter: blur(24px) saturate(155%); transform-style: preserve-3d; transition: transform 300ms var(--ease-spring), border-color 250ms ease-out, box-shadow 300ms ease-out, background-color 250ms ease-out; }
.glass-card::before { content: ""; position: absolute; z-index: -1; inset: -1px; opacity: 0; border-radius: inherit; padding: 1px; background: linear-gradient(120deg, transparent 10%, rgba(85,177,255,.75), rgba(194,224,255,.5), transparent 68%); background-size: 220% 220%; mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); mask-composite: exclude; transition: opacity 250ms ease-out; animation: border-flow 4s linear infinite; }
@keyframes border-flow { to { background-position: 200% 200%; } }
.glass-card:hover { border-color: transparent; box-shadow: var(--shadow-hover), inset 0 1px var(--line-bright); }
.glass-card:hover::before { opacity: 1; }
.card-glare { position: absolute; z-index: -1; inset: 0; pointer-events: none; opacity: 0; background: radial-gradient(300px circle at var(--mouse-x, 50%) var(--mouse-y, 30%), rgba(255,255,255,.42), transparent 55%); transition: opacity 260ms ease-out; }
[data-theme="dark"] .card-glare { background: radial-gradient(320px circle at var(--mouse-x, 50%) var(--mouse-y, 30%), rgba(74,159,255,.2), transparent 58%); }
.glass-card:hover .card-glare { opacity: 1; }
.feature-card { min-height: 320px; padding: 2rem 1.65rem 1.55rem; border-radius: var(--radius-lg); display: grid; grid-template-rows: auto 1fr auto; place-items: center; text-align: center; }
.feature-icon { width: 48px; height: 48px; padding: 10px; color: var(--blue); border: 1px solid color-mix(in srgb, var(--blue) 17%, var(--line)); border-radius: 14px; background: color-mix(in srgb, var(--blue) 7%, var(--surface)); fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; box-shadow: inset 0 1px rgba(255,255,255,.4); }
.feature-content { width: 100%; align-self: center; transform: translateY(18px); transition: transform 320ms var(--ease-spring); }
.feature-card h3 { margin: 0; font-size: clamp(1.42rem, 1.55vw, 1.68rem); line-height: 1.25; letter-spacing: -.03em; }
.scene-card h3 { margin: 0; font-size: clamp(1.55rem, 1.75vw, 1.9rem); line-height: 1.25; letter-spacing: -.03em; }
.feature-card p, .scene-card p { margin: .75rem auto 0; color: var(--text-soft); font-size: clamp(.94rem, 1vw, 1.06rem); line-height: 1.72; opacity: .28; transform: translateY(8px); transition: opacity 260ms ease-out, transform 300ms var(--ease-spring); }
.feature-card:hover .feature-content { transform: translateY(0); }
.feature-card:hover p, .scene-card:hover p { opacity: 1; transform: translateY(0); }
.card-index { width: 100%; color: var(--text-faint); font-size: .72rem; font-weight: 650; letter-spacing: .08em; text-align: center; opacity: 0; transition: opacity 220ms ease-out; }
.feature-card:hover .card-index { opacity: .75; }

/* Continuity */
.continuity { padding-block: 4rem 8rem; }
.continuity-panel { min-height: 560px; display: grid; grid-template-columns: .78fr 1.22fr; align-items: center; gap: 3rem; overflow: hidden; padding: clamp(2rem, 5vw, 4.5rem); border: 1px solid var(--line); border-radius: var(--radius-xl); background: linear-gradient(140deg, color-mix(in srgb, var(--surface-strong) 95%, transparent), color-mix(in srgb, var(--blue) 8%, var(--surface))); box-shadow: var(--shadow), inset 0 1px var(--line-bright); }
.continuity-copy { position: relative; z-index: 2; }
.continuity-copy p:last-child { max-width: 30rem; margin: 1.5rem 0 0; color: var(--text-soft); }
.continuity-demo { position: relative; min-height: 310px; display: flex; align-items: center; justify-content: center; gap: 0; }
.device-screen { position: relative; width: 154px; height: 110px; flex: none; overflow: hidden; border: 4px solid color-mix(in srgb, var(--text) 68%, transparent); border-radius: 10px; background: var(--surface-strong); box-shadow: 0 22px 40px rgba(25,45,75,.16); }
.device-screen::after { content: ""; position: absolute; left: 50%; bottom: -21px; width: 56px; height: 18px; transform: translateX(-50%); border-bottom: 5px solid color-mix(in srgb, var(--text) 55%, transparent); }
.device-screen span { display: block; height: 18px; background: color-mix(in srgb, var(--blue) 15%, transparent); }
.device-screen i, .device-screen b { display: block; height: 8px; margin: 16px 18px 0; border-radius: 5px; background: color-mix(in srgb, var(--text) 12%, transparent); }
.device-screen b { width: 55%; margin-top: 8px; }
.screen-right { transform: scale(.92); opacity: .76; }
.transfer-line { position: relative; width: clamp(24px, 4vw, 72px); height: 1px; background: linear-gradient(90deg, var(--line), var(--blue)); }
.line-right { background: linear-gradient(90deg, var(--blue), var(--line)); }
.transfer-line span { position: absolute; top: -2px; width: 5px; height: 5px; border-radius: 50%; background: var(--blue-bright); box-shadow: 0 0 10px var(--blue); animation: transfer 2.2s ease-in-out infinite; }
.line-right span { animation-delay: 1.1s; }
@keyframes transfer { from { left: 0; opacity: 0; } 15% { opacity: 1; } to { left: calc(100% - 5px); opacity: 0; } }
.mini-drive { position: relative; z-index: 2; width: 78px; height: 146px; display: flex; align-items: flex-end; justify-content: center; padding-bottom: 24px; border-radius: 16px 16px 22px 22px; color: #334257; background: linear-gradient(115deg, #8693a2, #f9fcff 26%, #a4b1bf 62%, #e9f0f6); box-shadow: 0 24px 42px rgba(36,65,103,.23), inset 0 1px white; transform: rotate(7deg); }
.mini-drive::before { content: ""; position: absolute; left: 50%; top: -43px; width: 36px; height: 48px; transform: translateX(-50%); border-radius: 4px 4px 0 0; background: linear-gradient(90deg, #8993a0, #fff 48%, #8f9ba7); }
.mini-drive i { position: absolute; bottom: 47px; width: 4px; height: 4px; border-radius: 50%; background: #258ff7; box-shadow: 0 0 9px #258ff7; }
.mini-drive span { font-size: .42rem; font-weight: 800; letter-spacing: .15em; }

/* Scenes */
.section-heading-split { max-width: none; display: flex; align-items: end; justify-content: space-between; gap: 2rem; }
.section-heading-split > p { max-width: 280px; margin-bottom: .45rem; text-align: right; }
.scene-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.scene-card { min-height: 350px; display: grid; grid-template-columns: 1fr; align-content: center; justify-items: center; gap: 1.65rem; padding: 2.25rem; border-radius: var(--radius-lg); text-align: center; }
.scene-card > div:last-child { width: 100%; display: flex; flex-direction: column; align-items: center; }
.scene-art { align-self: center; justify-self: center; width: 126px; height: 126px; display: grid; place-items: center; border-radius: 38px; color: var(--blue); background: linear-gradient(145deg, color-mix(in srgb, var(--blue) 11%, var(--surface)), color-mix(in srgb, var(--violet) 5%, transparent)); box-shadow: inset 0 1px var(--line-bright), 0 20px 45px rgba(51,100,160,.1); transform: rotate(-4deg); transition: transform 420ms var(--ease-spring); }
.scene-card:hover .scene-art { transform: rotate(2deg) translateY(-6px) scale(1.025); }
.scene-art svg { width: 58px; height: 58px; fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.scene-card p { max-width: 30rem; }
.scene-travel .scene-art { color: #766bf5; }.scene-switch .scene-art { color: #13a3bd; }.scene-create .scene-art { color: #0d91ef; }

/* FAQ */
.faq-section { background: color-mix(in srgb, var(--bg-deep) 52%, transparent); }
.faq-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(3rem, 9vw, 8rem); align-items: start; }
.faq-heading { position: sticky; top: calc(var(--header-height) + 4rem); }
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-question { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.4rem .25rem; border: 0; background: transparent; text-align: left; font-weight: 600; font-size: 1rem; cursor: pointer; }
.faq-question i { position: relative; width: 28px; height: 28px; flex: none; border: 1px solid var(--line); border-radius: 50%; transition: transform 280ms var(--ease-spring), background-color 220ms ease-out; }
.faq-question i::before, .faq-question i::after { content: ""; position: absolute; left: 8px; right: 8px; top: 13px; height: 1px; background: currentColor; }
.faq-question i::after { transform: rotate(90deg); transition: transform 220ms ease-out; }
.faq-item.is-open .faq-question i { transform: rotate(90deg); background: color-mix(in srgb, var(--blue) 9%, transparent); }
.faq-item.is-open .faq-question i::after { transform: rotate(0); }
.faq-answer { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 350ms var(--ease-spring); }
.faq-answer p { overflow: hidden; margin: 0; padding: 0 2.8rem 0 .25rem; color: var(--text-soft); font-size: .9rem; line-height: 1.75; opacity: 0; transition: opacity 220ms ease-out, padding 350ms var(--ease-spring); }
.faq-item.is-open .faq-answer { grid-template-rows: 1fr; }
.faq-item.is-open .faq-answer p { padding-bottom: 1.45rem; opacity: 1; }

/* CTA and footer */
.final-cta { text-align: center; overflow: hidden; }
.final-cta::before { content: ""; position: absolute; left: 50%; bottom: -55%; width: min(800px, 90vw); aspect-ratio: 1; transform: translateX(-50%); border-radius: 50%; background: radial-gradient(circle, rgba(37,143,255,.17), transparent 67%); pointer-events: none; }
.final-cta-inner { position: relative; }
.final-cta p:not(.eyebrow) { margin: 1.2rem 0 1.8rem; color: var(--text-soft); }
.site-footer { padding: 3.5rem 0 2rem; border-top: 1px solid var(--line); background: color-mix(in srgb, var(--bg-deep) 34%, transparent); }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 3rem; }
.footer-brand p { margin: .6rem 0 0; color: var(--text-faint); font-size: .78rem; }
.footer-links { display: grid; grid-template-columns: repeat(2, auto); align-content: start; gap: .55rem 2.2rem; }
.footer-links a, .footer-bottom { color: var(--text-faint); font-size: .72rem; }
.footer-links a:hover, .footer-bottom a:hover { color: var(--text); }
.footer-bottom { grid-column: 1 / -1; display: flex; justify-content: space-between; padding-top: 2rem; border-top: 1px solid var(--line); }

/* Recharge page */
.recharge-nav { grid-template-columns: 1fr auto 1fr; }
.back-link { justify-self: start; display: inline-flex; align-items: center; gap: .25rem; color: var(--text-soft); font-size: .78rem; transition: color 180ms ease-out, transform 180ms ease-out; }
.back-link:hover { color: var(--text); transform: translateX(-2px); }
.recharge-nav .theme-toggle { justify-self: end; }
.recharge-main { min-height: 100vh; }
.recharge-hero { position: relative; padding: calc(var(--header-height) + 7rem) 0 5rem; overflow: hidden; text-align: center; }
.recharge-hero-inner { position: relative; z-index: 2; }
.recharge-hero h1 { margin: 0; font-size: clamp(3.6rem, 8vw, 6.6rem); font-weight: 720; letter-spacing: -.065em; line-height: .98; }
.recharge-unit { margin: 1.1rem 0 0; color: var(--text-soft); font-size: 1rem; font-weight: 580; letter-spacing: .03em; }.recharge-unit span { margin-inline: .35rem; color: var(--blue); }
.recharge-intro { max-width: 560px; margin: 1.5rem auto 0; color: var(--text-soft); font-size: .9rem; }
.ambient-price { width: min(820px, 92vw); height: 420px; left: 50%; top: -36%; transform: translateX(-50%); border-radius: 50%; background: radial-gradient(circle, rgba(39,148,255,.2), transparent 66%); filter: blur(18px); }
.pricing-section { padding: 2rem 0 7rem; }
.pricing-heading { display: flex; align-items: end; justify-content: space-between; margin-bottom: 1.5rem; }
.pricing-heading h2 { margin: 0; font-size: 2rem; letter-spacing: -.04em; }
.pricing-heading > p { display: inline-flex; align-items: center; gap: .45rem; margin: 0 0 .3rem; color: var(--text-faint); font-size: .72rem; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px color-mix(in srgb, var(--green) 65%, transparent); }
.pricing-shell { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-xl); background: var(--surface); box-shadow: var(--shadow), inset 0 1px var(--line-bright); backdrop-filter: blur(28px) saturate(150%); }
.table-scroll { overflow-x: auto; outline: none; scrollbar-width: thin; scrollbar-color: var(--line) transparent; }
.pricing-table { width: 100%; min-width: 900px; border-collapse: collapse; table-layout: auto; }
.pricing-table th, .pricing-table td { padding: 1.15rem 1.1rem; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; }
.pricing-table thead th { position: sticky; top: 0; z-index: 2; color: var(--text-faint); background: color-mix(in srgb, var(--surface-strong) 92%, transparent); font-size: .68rem; font-weight: 650; letter-spacing: .07em; }
.pricing-table thead th:first-child, .pricing-table tbody th { text-align: left; }
.pricing-table tbody th { font-size: .85rem; font-weight: 620; }.pricing-table tbody td { color: var(--text-soft); font-variant-numeric: tabular-nums; font-size: .82rem; }
.pricing-table tbody tr { transition: background-color 180ms ease-out, transform 180ms ease-out; }
.pricing-table tbody tr:hover { background: color-mix(in srgb, var(--blue) 6%, transparent); }
.pricing-table tbody tr:last-child > * { border-bottom: 0; }
.pricing-table td small { display: block; margin-top: .15rem; color: var(--text-faint); font-size: .58rem; }
.pricing-table .muted { color: var(--text-faint); }
.model-dot { display: inline-block; width: 7px; height: 7px; margin-right: .65rem; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 3px color-mix(in srgb, var(--blue) 10%, transparent); vertical-align: 1px; }
.model-opus{background:#8077f3}.model-sonnet{background:#35a6f2}.model-haiku{background:#40b9a0}.model-sol{background:#f08a5d}.model-terra{background:#65a873}.model-luna{background:#aaa5ee}.model-glm{background:#e9aa36}.model-deepseek{background:#4b7ff0}
.note-badge { display: inline-flex; padding: .3rem .55rem; border-radius: 999px; color: var(--green); background: color-mix(in srgb, var(--green) 9%, transparent); font-size: .62rem; font-weight: 650; }
.pricing-footnote { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem 1.25rem; border-top: 1px solid var(--line); color: var(--text-faint); font-size: .65rem; }
.pricing-footnote span:last-child { display: none; }
.contact-section { padding-top: 5rem; text-align: center; background: linear-gradient(to bottom, transparent, color-mix(in srgb, var(--bg-deep) 48%, transparent)); }
.contact-inner > p:not(.eyebrow) { margin: 1rem 0 1.7rem; color: var(--text-soft); }
.qr-card { width: min(290px, 100%); margin: 2.2rem auto 0; padding: 12px; border: 1px solid var(--line); border-radius: 30px; background: var(--surface); box-shadow: var(--shadow), inset 0 1px var(--line-bright); backdrop-filter: blur(24px); }
.qr-media { margin: 0; }
.qr-image { width: 100%; height: auto; display: block; object-fit: contain; border: 0; border-radius: 21px; background: #27272c; }
.qr-media figcaption { padding: .75rem .5rem .25rem; color: var(--text-faint); font-size: .65rem; line-height: 1.5; }
.compact-footer { padding-block: 1.6rem; }.compact-footer .footer-bottom { padding-top: 0; border: 0; }

/* Reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 700ms var(--ease-spring) var(--delay, 0ms), transform 700ms var(--ease-spring) var(--delay, 0ms); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 980px) {
  :root { --page: min(100% - 36px, 760px); }
  .nav-shell { grid-template-columns: 1fr auto; }
  .nav-links { position: absolute; top: calc(100% + 8px); left: 0; right: 0; display: grid; gap: .25rem; padding: .6rem; opacity: 0; visibility: hidden; transform: translateY(-8px) scale(.98); transform-origin: top; border: 1px solid var(--line); border-radius: 18px; background: var(--surface-strong); box-shadow: var(--shadow); backdrop-filter: blur(24px) saturate(160%); transition: opacity 180ms ease-out, transform 220ms var(--ease-spring), visibility 180ms; }
  .nav-links.is-open { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
  .nav-links a { padding: .75rem .9rem; border-radius: 12px; }.nav-links a:hover { background: color-mix(in srgb, var(--blue) 7%, transparent); }.nav-links a::after { display:none; }
  .menu-toggle { position: absolute; right: 7.6rem; display: grid; place-content: center; gap: 5px; width: 36px; height: 36px; padding: 0; border: 0; background: transparent; cursor: pointer; }
  .menu-toggle span { display: block; width: 17px; height: 1px; background: currentColor; transition: transform 220ms var(--ease-spring); }.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3px) rotate(45deg); }.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3px) rotate(-45deg); }
  .hero { min-height: auto; padding-top: calc(var(--header-height) + 5rem); }
  .hero-grid { grid-template-columns: 1fr; }.hero-copy { text-align: center; }.hero-lead { margin-inline: auto; }.hero-actions,.hero-notes { justify-content: center; }.hero-visual { height: 520px; max-width: 620px; width: 100%; margin: -1.5rem auto 0; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }.feature-card { min-height: 285px; }
  .continuity-panel { grid-template-columns: 1fr; }.continuity-copy { text-align: center; }.continuity-copy p:last-child { margin-inline: auto; }
  .faq-layout { grid-template-columns: 1fr; gap: 2rem; }.faq-heading { position: static; }
  .recharge-nav { grid-template-columns: 1fr auto 1fr; }
}

@media (max-width: 680px) {
  :root { --page: min(100% - 28px, 540px); --radius-xl: 1.5rem; }
  .section { padding-block: 6rem; }
  .recharge-link { font-size: 0; width: 38px; min-height: 38px; padding: 0; }.recharge-link::after { content: "¥"; font-size: .86rem; }
  .menu-toggle { right: 5.3rem; }
  .hero { padding-bottom: 4rem; }.hero-title { font-size: clamp(2.65rem, 13vw, 3.7rem); }.hero-lead { font-size: .94rem; }.hero-actions { flex-direction: column; align-items: center; }.hero-actions .button { width: min(100%, 260px); }.hero-notes { gap: .55rem 1rem; }
  .hero-visual { height: 430px; }.usb-device { width: 142px; height: 302px; }.usb-connector { width: 56px; height: 72px; }.usb-connector::before { inset: 10px 9px 15px; }.contact { top: 19px; width: 9px; height: 22px; }.contact-one { left: 17px; }.contact-two { right: 17px; }.usb-neck { top: 61px; width: 75px; height: 31px; }.usb-body { inset-top: 80px; inset: 80px 0 0; border-radius: 24px 24px 30px 30px; }.usb-brand { top: 82px; }.usb-brand svg { width: 25px; height: 25px; }.usb-body > p { bottom: 19px; }.usb-led { bottom: 44px; }.product-caption { right: 0; bottom: 7%; }.scroll-cue { display: none; }
  .section-heading h2, .continuity-copy h2, .final-cta h2, .contact-inner h2 { font-size: clamp(2rem, 10vw, 2.9rem); }
  .feature-grid, .scene-grid { grid-template-columns: 1fr; }.feature-card { min-height: 270px; }.feature-content { transform: translateY(0); }.feature-card p, .scene-card p { opacity: .76; transform: none; }.card-index { opacity: .6; }
  .continuity { padding-top: 2rem; }.continuity-panel { min-height: 620px; padding: 2.2rem 1.2rem; }.continuity-demo { transform: scale(.78); margin-inline: -70px; }
  .section-heading-split { display: block; }.section-heading-split > p { margin-top: 1rem; text-align: left; }
  .scene-card { min-height: 310px; grid-template-columns: 1fr; padding: 1.75rem 1.25rem; }.scene-art { width: 104px; height: 104px; border-radius: 30px; }.scene-art svg { width: 48px; height: 48px; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }.footer-links { justify-content: start; }.footer-bottom { flex-direction: column; gap: .4rem; }
  .recharge-hero { padding-top: calc(var(--header-height) + 5rem); }.recharge-hero h1 { font-size: clamp(3.2rem, 18vw, 5rem); }.brand-centered span { display: none; }.pricing-section { padding-bottom: 4rem; }.pricing-shell { border-radius: 1.25rem; }.pricing-footnote span:last-child { display: inline; }.pricing-footnote { flex-direction: column; }.contact-section { padding-top: 4rem; }
}

@media (hover: none) {
  .glass-card:hover { transform: none; }.feature-content { transform: none; }.feature-card p, .scene-card p { opacity: .76; transform: none; }.card-index { opacity: .55; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: 120ms !important; }
  .hero-sequence, .reveal { transform: none !important; opacity: 1 !important; }
  .usb-device { transform: rotateZ(31deg) !important; }
}
@media (prefers-reduced-transparency: reduce) {
  .site-header.is-scrolled, .glass-card, .pricing-shell, .qr-card, .theme-toggle { backdrop-filter: none; -webkit-backdrop-filter: none; background: var(--surface-strong); }
}
@media (prefers-contrast: more) {
  :root { --line: rgba(20,30,45,.35); --text-soft: #343b45; --surface: rgba(255,255,255,.95); }
  [data-theme="dark"] { --line: rgba(235,245,255,.4); --text-soft: #d9e0e8; --surface: rgba(10,16,26,.95); }
}