/* 开场两屏独立于内容区：完整视口、背景铺底、滚动过渡。 */
html { scroll-padding-top: 100px; }
.site-header { position: fixed; inset: 0 0 auto; background: transparent; border-color: transparent; backdrop-filter: none; transition: background .3s, transform .35s, border-color .3s; }
.site-header.is-scrolled { background: #080e16e8; border-color: var(--line); backdrop-filter: blur(20px); }
.site-header.is-reel { transform: translateY(-100%); }
.site-header:focus-within { transform: none; }
.intro-screen { position: relative; height: 100svh; min-height: 600px; overflow: hidden; isolation: isolate; scroll-margin-top: 0; }
.hero { --hero-exit: 0; background: #090f17; }
.hero-backdrop, .hero-backdrop img, .hero-shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-backdrop { z-index: -3; transform: scale(calc(1 + var(--hero-exit) * .07)); }
.hero-backdrop img { object-fit: cover; object-position: center; }
.hero-shade { z-index: -2; background: linear-gradient(90deg, #060c16e0 0%, #070f1bb0 38%, #07101c10 75%), linear-gradient(0deg, #080e16 0%, #080e1600 42%); }
.hero-copy { position: absolute; z-index: 2; left: max(56px, calc((100vw - 1440px) / 2)); top: 43%; transform: translateY(calc(-50% - var(--hero-exit) * 50px)); opacity: calc(1 - var(--hero-exit) * 1.2); }
.hero .eyebrow { font-size: 18px; letter-spacing: .14em; margin-bottom: 25px; }
.hero h1 { font-size: clamp(56px, 6.12vw, 88px); line-height: 1.22; font-weight: 500; letter-spacing: -.055em; }
.hero h1 > span { color: var(--accent); }
.hero-description { font-size: 24px; line-height: 1.7; color: #c3ced9; margin-top: 30px; }
.hero-actions { display: flex; align-items: center; gap: 22px; margin-top: 34px; }
.hero-note { color: #8ca0b2; font-size: 14px; letter-spacing: .08em; margin-top: 24px; }
.hero-products { position: absolute; inset: 0; z-index: -1; pointer-events: none; transform: translateY(calc(var(--hero-exit) * 70px)); opacity: calc(1 - var(--hero-exit)); }
.hero-large { position: absolute; height: 65%; width: auto; max-width: 46%; object-fit: contain; right: 4%; bottom: 19%; filter: drop-shadow(20px 25px 28px #0007); }
.hero-small { position: absolute; width: 23%; max-height: 38%; object-fit: contain; right: 26%; bottom: 18%; transform: scale(1.1); transform-origin: center bottom; filter: drop-shadow(12px 20px 20px #0009); }
.hero .process-strip { position: absolute; bottom: 66px; left: 0; right: 0; border-color: #9fbad130; background: #080e1626; }
.hero .process-strip > a { padding-block: 22px; }
.film-section { --reel-entry: 0; background: #080e16; }
.reel-surface { position: absolute; inset: 0; overflow: hidden; transform: scale(calc(.9 + var(--reel-entry) * .1)); border-radius: calc(32px - var(--reel-entry) * 32px); background: #101e2b; }
.reel-poster, .reel-background, .reel-shade, .reel-video { position: absolute; inset: 0; width: 100%; height: 100%; }
.reel-poster { z-index: 1; }
.reel-background { object-fit: cover; transform: scale(1.12); object-position: 70% 50%; }
.reel-shade { background: linear-gradient(0deg, #040b14ef, #07142136 55%, #08132070), linear-gradient(90deg, #04101d88, #122d3a33); }
.film-copy { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 80px 24px 110px; }
.film-copy .eyebrow { font-size: 18px; }
.film-copy h2 { font-size: clamp(36px, 4.45vw, 64px); line-height: 1.3; font-weight: 500; margin-top: 24px; }
.film-copy h2 > span { white-space: nowrap; }
.film-description { font-size: 24px; line-height: 1.7; color: #b7c9d8; margin-top: 24px; }
.reel-play-button { position: relative; isolation: isolate; overflow: hidden; flex-shrink: 0; width: 144px; height: 92px; padding: 0; border-radius: 46px; margin-top: 48px; display: grid; place-items: center; background: #fff; color: #102c27; transition: background .3s cubic-bezier(.4,0,.1,1), transform .18s ease; }
.reel-play-button::before { content: ""; position: absolute; inset: 0; z-index: -1; background: var(--accent); transform: scaleY(0); transform-origin: center bottom; transition: transform .4s cubic-bezier(.4,0,.1,1); }
.reel-play-button svg { width: 32px; height: 32px; fill: currentColor; }
.reel-play-button:focus-visible { background: var(--accent); transition: background .1s cubic-bezier(.4,0,.1,1) .3s, transform .18s ease; }
.reel-play-button:focus-visible::before { transform: scaleY(1); }
@media (hover: hover) {
  .reel-play-button:hover { background: var(--accent); transition: background .1s cubic-bezier(.4,0,.1,1) .3s, transform .18s ease; }
  .reel-play-button:hover::before { transform: scaleY(1); }
}
.reel-play-button:active { background: var(--accent); transform: scale(.96); transition-delay: 0s; }
.reel-play-button:active::before { transform: scaleY(1); }
.film-status { display: flex; align-items: center; gap: 10px; font-size: 16px; color: #bdd2d6; margin-top: 24px; }
.reel-meta { position: absolute; z-index: 2; bottom: 86px; left: 56px; right: 56px; display: flex; justify-content: space-between; gap: 24px; padding-top: 22px; border-top: 1px solid #c0e0ec25; color: #b9cbd4; font-size: 16px; pointer-events: none; }
.reel-video { object-fit: contain; background: #000; }
.film-section.has-video .reel-background { display: none; }
.film-section.has-video .reel-meta { display: none; }
.film-section.has-video .reel-poster { pointer-events: none; }
.film-section.has-video .reel-shade, .film-section.has-video .film-copy > :not(.reel-play-button) { display: none; }
.film-section.has-video .film-copy { padding: 0; }
.film-section.has-video .reel-play-button { margin-top: 0; pointer-events: auto; }
.film-load-error { position: absolute; z-index: 2; bottom: 160px; width: 100%; text-align: center; color: #f1c6b1; padding: 0 24px; font-size: 16px; }
.hardware-section { scroll-margin-top: 0; }
@media (min-width: 1600px) {
  .hero-large { right: 9%; }
  .hero-small { right: 29%; width: 20%; }
}
@media (max-width: 1120px) {
  .hero-copy { left: 40px; }
  .hero h1 { font-size: 64px; }
  .hero-description { font-size: 20px; }
  .hero-large { height: 58%; right: 1%; }
  .hero-small { width: 25%; right: 22%; }
  .hero .process-strip > a { padding-inline: 18px; gap: 12px; font-size: 18px; }
  .hero .process-strip .step-number, .hero .process-strip .step-arrow { display: none; }
}
@media (max-width: 800px) {
  .hero-copy { left: 32px; top: 34%; }
  .hero h1 { font-size: 56px; }
  .hero-description { font-size: 20px; margin-top: 22px; }
  .hero-large { height: 46%; right: 2%; bottom: 17%; }
  .hero-small { width: 26%; right: 24%; bottom: 16%; }
  .hero-shade { background: linear-gradient(90deg, #060c16d9, #070f1b60), linear-gradient(0deg, #080e16, #080e1600 35%); }
  .hero .process-strip { bottom: 60px; grid-template-columns: repeat(4, 1fr); }
  .hero .process-strip > a { flex-direction: row; justify-content: center; gap: 10px; padding: 20px 8px; }
  .hero .process-strip > a:nth-child(3) { border-left: 1px solid var(--line); }
  .hero .process-strip > a:nth-child(n+3) { border-top: 0; }
  .hero .process-strip small { display: none; }
  .film-description { font-size: 20px; }
  .reel-meta { left: 32px; right: 32px; font-size: 14px; }
}
@media (max-width: 600px) {
  .intro-screen { height: 100svh; min-height: 0; }
  .hero-copy { top: 112px; left: 24px; right: 24px; transform: translateY(calc(var(--hero-exit) * -30px)); }
  .hero .eyebrow { font-size: 14px; margin-bottom: 16px; }
  .hero h1 { font-size: clamp(36px, 10.25vw, 44px); line-height: 1.3; letter-spacing: -.045em; }
  .hero-description { font-size: 18px; line-height: 1.7; margin-top: 20px; }
  .hero-description br { display: none; }
  .hero-actions { margin-top: 24px; gap: 10px; }
  .hero-actions .button { font-size: 16px; gap: 12px; padding: 12px 16px; min-height: 52px; }
  .hero-actions .button-quiet { padding-inline: 6px; gap: 8px; }
  .hero-actions .button-quiet .icon { display: none; }
  .hero-note { display: none; }
  .hero-backdrop img { object-position: 65% 50%; }
  .hero-large { height: 34%; max-width: 50%; right: 10%; bottom: 111px; }
  .hero-small { width: 33%; max-height: 25%; right: 49%; bottom: 108px; }
  .hero .process-strip { width: calc(100% - 48px); bottom: 49px; }
  .hero .process-strip > a { padding: 14px 0; font-size: 14px; }
  .hero .process-strip .icon { display: none; }
  .film-copy { padding: 60px 24px 120px; }
  .film-copy .eyebrow { font-size: 14px; }
  .film-copy h2 { max-width: 310px; font-size: 36px; line-height: 1.4; margin-top: 22px; }
  .film-description { font-size: 18px; margin-top: 20px; }
  .reel-play-button { width: 120px; height: 76px; border-radius: 38px; margin-top: 36px; }
  .reel-play-button svg { width: 28px; height: 28px; }
  .film-status { font-size: 14px; }
  .reel-meta { bottom: 65px; left: 24px; right: 24px; justify-content: center; font-size: 14px; }
  .reel-meta > span:last-child { display: none; }
}
@media (max-width: 380px) {
  .hero-copy { left: 20px; right: 20px; }
  .hero-actions { gap: 4px; }
  .hero-actions .button { font-size: 15px; padding-inline: 12px; }
  .hero-actions .button-quiet { padding-inline: 4px; }
  .workspace-tabs .icon { display: none; }
  .workspace-tabs button { white-space: nowrap; font-size: 14px; }
}
@media (max-width: 600px) and (max-height: 740px) {
  .hero-copy { top: 100px; }
  .hero-large { height: min(25%, calc(100svh - 540px)); bottom: 102px; right: 14%; }
  .hero-small { width: auto; height: min(20%, calc(100svh - 565px)); max-width: 26%; bottom: 102px; right: 50%; }
}
@media (max-width: 600px) and (max-height: 640px) {
  .hero-copy { top: 100px; }
  .hero .eyebrow, .hero-products { display: none; }
  .hero-description { font-size: 16px; margin-top: 18px; }
  .hero-actions { margin-top: 20px; }
  .film-copy { padding-block: 40px 110px; }
  .film-copy h2 { font-size: 30px; margin-top: 16px; }
  .reel-play-button { width: 104px; height: 66px; border-radius: 33px; margin-top: 24px; }
}
@media (min-width: 801px) and (max-height: 780px) {
  .hero-copy { top: 44%; }
  .hero h1 { font-size: clamp(52px, 5vw, 72px); }
  .hero .eyebrow { margin-bottom: 16px; }
  .hero-description { margin-top: 20px; font-size: 20px; }
  .hero-actions { margin-top: 24px; }
  .hero-note { display: none; }
  .hero .process-strip > a { padding-block: 16px; }
  .hero .process-strip small { margin-top: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  .hero { --hero-exit: 0 !important; }
  .hero-copy, .hero-products { opacity: 1; }
  .hero-products, .hero-backdrop, .reel-surface { transform: none; }
  .reel-surface { border-radius: 0; }
  .site-header { transition: none; }
}