/* ============================================================
   COREVOLT P20 Ultra — 产品说明页样式
   配色：石墨黑 + 暖琥珀，单一强调色
   字体：Outfit（自托管，SIL OFL 1.1）
   ============================================================ */

/* ---------- 字体 ---------- */
/* Outfit 为可变字体，单个 latin 子集文件覆盖 300~700 字重 */
@font-face {
  font-family: 'Outfit';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url('../assets/fonts/outfit-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
                 U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
                 U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

:root {
  /* 色板 */
  --ink:        #101114;
  --ink-2:      #17191e;
  --ink-3:      #21242b;
  --cream:      #f5f3ef;
  --cream-2:    #efece6;
  --paper:      #ffffff;
  --accent:     #d9843a;
  --accent-soft:#e8a45f;
  --accent-ink: #8c4f16;

  --muted-d:    #9b9fa9;
  --muted-l:    #6e7278;
  --line-d:     rgba(255, 255, 255, .09);
  --line-l:     #e3dfd7;

  /* 字体 */
  --font: 'Outfit', 'Segoe UI Variable Display', 'Segoe UI', 'PingFang SC',
          'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;

  /* 节奏 */
  --pad-x: clamp(1.25rem, 5vw, 4.5rem);
  --gap-section: clamp(5rem, 11vw, 9.5rem);
  --radius: 26px;
  --radius-lg: 34px;

  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --ease-in:  cubic-bezier(.7, 0, .84, 0);

  --shadow-lift: 0 24px 60px -28px rgba(16, 17, 20, .38);
  --shadow-deep: 0 40px 90px -40px rgba(0, 0, 0, .8);
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
  background: var(--ink);
}
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
dl, dd, dt { margin: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 200;
  padding: .7rem 1.2rem;
  background: var(--accent);
  color: #fff;
  border-radius: 0 0 10px 10px;
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 0; }

/* ============================================================
   通用排版
   ============================================================ */
.section-title {
  font-size: clamp(2rem, 4.2vw, 3.4rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -.035em;
}
.section-title--light { color: var(--cream); }

.section-lede {
  margin-top: 1.35rem;
  max-width: 60ch;
  font-size: clamp(1rem, 1.35vw, 1.075rem);
  font-weight: 300;
  line-height: 1.8;
  color: var(--muted-l);
}
.section-lede--light { color: var(--muted-d); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: 1.5rem;
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent-soft);
}
.eyebrow--dark { color: var(--accent-ink); }
.eyebrow__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px color-mix(in srgb, currentColor 18%, transparent);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  padding: .95rem 1.7rem;
  border-radius: 999px;
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: -.01em;
  white-space: nowrap;
  transition: transform .22s var(--ease-out),
              background-color .22s var(--ease-out),
              border-color .22s var(--ease-out),
              color .22s var(--ease-out),
              box-shadow .22s var(--ease-out);
}
.btn svg { width: 17px; height: 17px; flex: none; }
.btn:active { transform: scale(.975); }

.btn--solid {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 30px -14px rgba(217, 132, 58, .85);
}
.btn--solid:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 18px 38px -14px rgba(217, 132, 58, .9);
}

.btn--line {
  border: 1px solid var(--line-l);
  color: var(--ink);
  background: rgba(255, 255, 255, .4);
}
.btn--line:hover { border-color: var(--ink); transform: translateY(-2px); }

.btn--ghost {
  border: 1px solid var(--line-d);
  color: var(--cream);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent-soft); }

.btn--sm { padding: .6rem 1.15rem; font-size: .87rem; }
.btn--lg { padding: 1.1rem 2.1rem; font-size: 1rem; }

.btn__meta {
  padding-left: .7rem;
  margin-left: .2rem;
  border-left: 1px solid rgba(255, 255, 255, .35);
  font-size: .8rem;
  font-variant-numeric: tabular-nums;
  opacity: .85;
}

/* ============================================================
   导航
   ============================================================ */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: transparent;
  transition: background-color .35s var(--ease-out),
              backdrop-filter .35s var(--ease-out),
              box-shadow .35s var(--ease-out);
}
.nav.is-scrolled {
  background: rgba(16, 17, 20, .78);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: 0 1px 0 var(--line-d);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.05rem var(--pad-x);
}
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--cream); }
.brand__mark { width: 27px; height: 27px; flex: none; }
.brand__text { font-size: .98rem; font-weight: 600; letter-spacing: .2em; }

.nav__links { display: flex; gap: 2rem; }
.nav__links a {
  position: relative;
  font-size: .9rem;
  color: var(--muted-d);
  transition: color .2s var(--ease-out);
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--ease-out);
}
.nav__links a:hover { color: var(--cream); }
.nav__links a:hover::after { transform: scaleX(1); }

.nav__actions { display: flex; align-items: center; gap: .7rem; }
.nav__progress {
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .12s linear;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--cream);
  padding: clamp(7.5rem, 14vw, 11rem) var(--pad-x) clamp(4rem, 8vw, 7rem);
}
.hero__glow {
  position: absolute;
  top: -18%;
  right: -8%;
  width: 62vw;
  height: 62vw;
  max-width: 880px;
  max-height: 880px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%,
              rgba(217, 132, 58, .30) 0%,
              rgba(217, 132, 58, .10) 38%,
              transparent 68%);
  filter: blur(20px);
  pointer-events: none;
}
.hero__grain {
  position: absolute;
  inset: 0;
  opacity: .045;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  align-items: center;
  gap: clamp(2.5rem, 6vw, 5.5rem);
  max-width: 1400px;
  margin: 0 auto;
}

.hero__title {
  font-size: clamp(2.4rem, 5.4vw, 4.5rem);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -.04em;
}
.hero__lede {
  margin-top: 1.7rem;
  max-width: 52ch;
  font-size: clamp(1rem, 1.3vw, 1.075rem);
  font-weight: 300;
  line-height: 1.82;
  color: var(--muted-d);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-top: 2rem;
}
.chip {
  padding: .48rem 1rem;
  border: 1px solid var(--line-d);
  border-radius: 999px;
  background: rgba(255, 255, 255, .03);
  font-size: .82rem;
  font-variant-numeric: tabular-nums;
  color: #c9ccd3;
  backdrop-filter: blur(6px);
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: .85rem;
  margin-top: 2.4rem;
}
.hero__cta .btn--line { color: var(--cream); border-color: var(--line-d); background: transparent; }
.hero__cta .btn--line:hover { border-color: var(--cream); }

.hero__note {
  margin-top: 1.6rem;
  font-size: .84rem;
  color: #7e828c;
}

/* Hero 产品图 */
.hero__visual { position: relative; }
.hero__frame {
  position: relative;
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-d);
  box-shadow: var(--shadow-deep);
  background: #0a0b0d;
}
.hero__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
}
.hero__badge {
  position: absolute;
  left: 1.15rem;
  bottom: 1.15rem;
  display: grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  gap: 0 .3rem;
  padding: .95rem 1.25rem;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, .16);
  background: rgba(16, 17, 20, .55);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12);
}
.hero__badge-num {
  font-size: 2.1rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--accent-soft);
}
.hero__badge-unit { font-size: 1rem; font-weight: 500; color: var(--accent-soft); }
.hero__badge-label {
  grid-column: 1 / -1;
  margin-top: .35rem;
  font-size: .72rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--muted-d);
}

/* ============================================================
   Stats 数字条
   ============================================================ */
.stats {
  background: var(--ink);
  color: var(--cream);
  padding: 0 var(--pad-x) clamp(3.5rem, 7vw, 6rem);
}
.stats__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: 1400px;
  margin: 0 auto;
  border-top: 1px solid var(--line-d);
}
.stat {
  padding: 2.4rem 1.6rem 0 0;
  border-right: 1px solid var(--line-d);
}
.stat:last-child { border-right: 0; }
.stat__num {
  font-size: clamp(2.1rem, 3.6vw, 3rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.045em;
  font-variant-numeric: tabular-nums;
}
.stat__unit {
  margin-left: .2rem;
  font-size: .95rem;
  font-weight: 500;
  color: var(--accent-soft);
}
.stat__label {
  display: block;
  margin-top: .75rem;
  font-size: .82rem;
  letter-spacing: .05em;
  color: #82868f;
}

/* ============================================================
   视频板块
   ============================================================ */
.film {
  background: var(--cream);
  padding: var(--gap-section) var(--pad-x);
  position: relative;
}
.film__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  align-items: center;
  gap: clamp(2.5rem, 6vw, 5.5rem);
  max-width: 1400px;
  margin: 0 auto;
}

.film__list {
  margin: 2.5rem 0 2.6rem;
  display: grid;
  gap: 1px;
  background: var(--line-l);
  border-block: 1px solid var(--line-l);
}
.film__list li {
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 1rem;
  padding: 1.35rem 0;
  background: var(--cream);
}
.film__idx {
  font-size: .82rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  padding-top: .18rem;
}
.film__list strong {
  display: block;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -.015em;
}
.film__list p {
  margin-top: .35rem;
  font-size: .9rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--muted-l);
}

.film__stage { display: flex; flex-direction: column; align-items: center; }
.player {
  position: relative;
  display: block;
  width: min(100%, 372px);
  aspect-ratio: 9 / 16;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(16, 17, 20, .1);
  box-shadow: var(--shadow-lift);
  background: #0c0d10;
  transition: transform .45s var(--ease-out), box-shadow .45s var(--ease-out);
}
.player:hover { transform: translateY(-6px); box-shadow: 0 40px 80px -34px rgba(16, 17, 20, .5); }
.player__poster {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .8s var(--ease-out), filter .45s var(--ease-out);
}
.player:hover .player__poster { transform: scale(1.045); filter: brightness(1.06); }
.player__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,
              rgba(12, 13, 16, .42) 0%,
              rgba(12, 13, 16, .12) 34%,
              rgba(12, 13, 16, .55) 100%);
}
.player__play {
  position: absolute;
  top: 50%; left: 50%;
  translate: -50% -50%;
  display: grid;
  place-items: center;
  width: 78px; height: 78px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 0 0 rgba(217, 132, 58, .5), 0 18px 40px -12px rgba(0, 0, 0, .6);
  animation: pulse 2.8s var(--ease-out) infinite;
}
.player__play svg { width: 27px; height: 27px; margin-left: 4px; }
.player:hover .player__play { background: var(--accent-soft); }
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(217, 132, 58, .45), 0 18px 40px -12px rgba(0, 0, 0, .6); }
  70%  { box-shadow: 0 0 0 26px rgba(217, 132, 58, 0), 0 18px 40px -12px rgba(0, 0, 0, .6); }
  100% { box-shadow: 0 0 0 0 rgba(217, 132, 58, 0), 0 18px 40px -12px rgba(0, 0, 0, .6); }
}
.player__tag,
.player__time {
  position: absolute;
  bottom: 1.1rem;
  padding: .4rem .8rem;
  border-radius: 999px;
  font-size: .74rem;
  letter-spacing: .06em;
  color: #fff;
  background: rgba(12, 13, 16, .58);
  border: 1px solid rgba(255, 255, 255, .16);
  backdrop-filter: blur(10px);
}
.player__tag { left: 1.1rem; }
.player__tag::before {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  margin-right: .45rem;
  border-radius: 50%;
  background: #ff5f57;
  vertical-align: middle;
  animation: blink 1.9s ease-in-out infinite;
}
@keyframes blink { 0%, 100% { opacity: 1 } 50% { opacity: .25 } }
.player__time { right: 1.1rem; font-variant-numeric: tabular-nums; }

.film__caption {
  margin-top: 1.2rem;
  font-size: .78rem;
  letter-spacing: .04em;
  color: #9a9d9f;
}

/* ============================================================
   Features / Bento
   ============================================================ */
.features {
  background: var(--ink);
  color: var(--cream);
  padding: var(--gap-section) var(--pad-x);
}
.features__head { max-width: 1400px; margin: 0 auto clamp(2.8rem, 5vw, 4rem); }
.features__head .section-lede { max-width: 54ch; }

.bento {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  max-width: 1400px;
  margin: 0 auto;
  background: var(--line-d);
  border: 1px solid var(--line-d);
  border-radius: var(--radius);
  overflow: hidden;
}
.bento__card {
  position: relative;
  padding: clamp(1.7rem, 2.6vw, 2.5rem);
  background: var(--ink-2);
  transition: background-color .4s var(--ease-out);
}
.bento__card:hover { background: var(--ink-3); }
.bento__card--wide { grid-column: span 2; }
.bento__card--full { grid-column: span 3; }

.bento__card--accent {
  background: linear-gradient(155deg, rgba(217, 132, 58, .13) 0%, var(--ink-2) 62%);
}
.bento__card--accent:hover { background: linear-gradient(155deg, rgba(217, 132, 58, .19) 0%, var(--ink-3) 62%); }

.bento__kicker {
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent-soft);
}
.bento__title {
  margin-top: .85rem;
  font-size: clamp(1.25rem, 2vw, 1.62rem);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -.028em;
}
.bento__text {
  margin-top: .95rem;
  max-width: 56ch;
  font-size: .92rem;
  font-weight: 300;
  line-height: 1.78;
  color: var(--muted-d);
}
.bento__meter {
  margin-top: 1.8rem;
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .09);
  overflow: hidden;
}
.bento__meter > span {
  display: block;
  width: 60%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transform: scaleX(0);
  transform-origin: left center;
}
[data-reveal].is-in .bento__meter > span {
  transform: scaleX(1);
  transition: transform 1.05s var(--ease-out) .25s;
}
.bento__foot {
  margin-top: .8rem;
  font-size: .8rem;
  color: #7e828c;
}

.bento__ticks {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  margin-top: 1.6rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line-d);
}
.bento__ticks li {
  position: relative;
  padding-left: 1.1rem;
  font-size: .85rem;
  color: #b9bcc3;
}
.bento__ticks li::before {
  content: '';
  position: absolute;
  left: 0; top: .52em;
  width: 6px; height: 6px;
  border-radius: 1px;
  background: var(--accent);
}

.bento__card--full {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
}
.bento__grid-ticks {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-d);
  border: 1px solid var(--line-d);
  border-radius: 16px;
  overflow: hidden;
}
.bento__grid-ticks li {
  padding: .85rem .9rem;
  background: rgba(255, 255, 255, .015);
  font-size: .82rem;
  color: #c2c5cb;
  transition: background-color .3s var(--ease-out), color .3s var(--ease-out);
}
.bento__grid-ticks li:hover { background: rgba(217, 132, 58, .16); color: #fff; }

/* ============================================================
   Ports
   ============================================================ */
.ports {
  background: var(--paper);
  padding: var(--gap-section) var(--pad-x) 0;
}
.ports__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  align-items: center;
  gap: clamp(2.5rem, 6vw, 5rem);
  max-width: 1400px;
  margin: 0 auto;
}
.ports__visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lift);
  border: 1px solid var(--line-l);
  background: #0c0d10;
}
.ports__visual img { width: 100%; }

.portlist {
  margin-top: 2.4rem;
  border-top: 1px solid var(--line-l);
}
.portlist__row {
  display: grid;
  grid-template-columns: 7rem 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line-l);
  transition: padding-left .3s var(--ease-out);
}
.portlist__row:hover { padding-left: .55rem; }
.portlist__name {
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: -.01em;
}
.portlist__spec {
  font-size: .88rem;
  color: var(--muted-l);
  font-variant-numeric: tabular-nums;
}
.portlist__badge {
  padding: .2rem .6rem;
  border-radius: 999px;
  background: rgba(217, 132, 58, .14);
  color: var(--accent-ink);
  font-size: .72rem;
  letter-spacing: .06em;
}
.ports__tip {
  margin-top: 1.6rem;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
  font-size: .86rem;
  line-height: 1.75;
  color: var(--muted-l);
}

/* ---------- 协议跑马灯 ---------- */
.marquee {
  margin-top: clamp(4rem, 8vw, 6.5rem);
  padding: 1.5rem 0;
  border-block: 1px solid var(--line-l);
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
}
.marquee__track {
  display: flex;
  gap: 3.5rem;
  width: max-content;
  animation: slide 42s linear infinite;
  will-change: transform;
}
.marquee:hover .marquee__track { animation-play-state: paused; }
.marquee__track span {
  font-size: clamp(1.05rem, 1.9vw, 1.5rem);
  font-weight: 300;
  letter-spacing: -.02em;
  color: #c4c1ba;
  white-space: nowrap;
}
@keyframes slide {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(-50%, 0, 0); }
}

/* ============================================================
   Desk
   ============================================================ */
.desk {
  background: var(--paper);
  padding: var(--gap-section) var(--pad-x);
}
.desk__inner {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  align-items: center;
  gap: clamp(2.5rem, 6vw, 5rem);
  max-width: 1400px;
  margin: 0 auto;
}
.desk__visual { position: relative; }
.desk__visual img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lift);
}
.desk__quote {
  position: absolute;
  right: -1rem;
  bottom: -2rem;
  max-width: 300px;
  padding: 1.3rem 1.5rem;
  border-radius: 20px;
  background: var(--ink);
  color: var(--cream);
  box-shadow: var(--shadow-deep);
}
.desk__quote p {
  font-size: .94rem;
  font-weight: 300;
  line-height: 1.7;
}
.desk__quote span {
  display: block;
  margin-top: .7rem;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--accent-soft);
}

.facts {
  margin-top: 2.4rem;
  border-top: 1px solid var(--line-l);
}
.facts__item {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 1rem;
  padding: .95rem 0;
  border-bottom: 1px solid var(--line-l);
}
.facts__item dt {
  font-size: .86rem;
  color: var(--muted-l);
}
.facts__item dd {
  font-size: .92rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   Specs
   ============================================================ */
.specs {
  background: var(--cream);
  padding: var(--gap-section) var(--pad-x);
}
.specs__inner { max-width: 1400px; margin: 0 auto; }
.specs__head { max-width: 62ch; margin-bottom: clamp(2.5rem, 5vw, 4rem); }

.spectable {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.6rem, 3.4vw, 3.2rem);
}
.spectable__group h3 {
  padding-bottom: .9rem;
  margin-bottom: .4rem;
  border-bottom: 2px solid var(--ink);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.spectable__group dl > div {
  padding: .9rem 0;
  border-bottom: 1px solid var(--line-l);
}
.spectable__group dt {
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--muted-l);
}
.spectable__group dd {
  margin-top: .3rem;
  font-size: .92rem;
  font-weight: 400;
  line-height: 1.65;
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   FAQ
   ============================================================ */
.faq {
  background: var(--paper);
  padding: var(--gap-section) var(--pad-x);
}
.faq__inner {
  display: grid;
  grid-template-columns: minmax(0, .62fr) minmax(0, 1.38fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  max-width: 1400px;
  margin: 0 auto;
  align-items: start;
}
.faq__head { position: sticky; top: 6.5rem; }
.faq__list { border-top: 1px solid var(--line-l); }

.qa { border-bottom: 1px solid var(--line-l); }
.qa summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.4rem 0;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  font-weight: 500;
  letter-spacing: -.015em;
  cursor: pointer;
  list-style: none;
  transition: color .25s var(--ease-out);
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary:hover { color: var(--accent-ink); }
.qa__icon {
  width: 19px; height: 19px;
  flex: none;
  color: var(--accent);
  transition: transform .35s var(--ease-out);
}
.qa[open] .qa__icon { transform: rotate(135deg); }
.qa__body { padding: 0 3rem 1.6rem 0; }
.qa__body p {
  font-size: .93rem;
  font-weight: 300;
  line-height: 1.85;
  color: var(--muted-l);
}
.qa[open] .qa__body { animation: qaIn .4s var(--ease-out); }
@keyframes qaIn {
  from { opacity: 0; transform: translate3d(0, -6px, 0); }
  to   { opacity: 1; transform: translate3d(0, 0, 0); }
}

/* ============================================================
   CTA
   ============================================================ */
.cta {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--cream);
  padding: clamp(5rem, 10vw, 8rem) var(--pad-x);
  text-align: center;
}
.cta::before {
  content: '';
  position: absolute;
  left: 50%; top: -40%;
  width: 78vw; height: 78vw;
  max-width: 900px; max-height: 900px;
  translate: -50% 0;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217, 132, 58, .22), transparent 66%);
  pointer-events: none;
}
.cta__inner { position: relative; max-width: 760px; margin: 0 auto; }
.cta__title {
  font-size: clamp(1.9rem, 4vw, 3.1rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -.038em;
}
.cta__lede {
  margin: 1.3rem auto 0;
  max-width: 46ch;
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.8;
  color: var(--muted-d);
}
.cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .85rem;
  margin-top: 2.4rem;
}
.cta__actions .btn--line {
  color: var(--cream);
  border-color: var(--line-d);
  background: transparent;
}
.cta__actions .btn--line:hover { border-color: var(--cream); }
.cta__meta {
  margin-top: 1.8rem;
  font-size: .82rem;
  letter-spacing: .03em;
  color: #7e828c;
}

/* ============================================================
   Footer
   ============================================================ */
.foot {
  background: var(--ink);
  color: var(--muted-d);
  border-top: 1px solid var(--line-d);
  padding: 3.2rem var(--pad-x) 2.6rem;
}
.foot__inner {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1.6rem 3rem;
  max-width: 1400px;
  margin: 0 auto;
}
.foot__brand { display: flex; align-items: center; gap: .85rem; color: var(--cream); }
.foot__brand .brand__mark { width: 30px; height: 30px; }
.foot__name { font-size: .95rem; font-weight: 600; letter-spacing: .2em; }
.foot__desc { margin-top: .2rem; font-size: .78rem; color: #7e828c; }
.foot__nav { display: flex; flex-wrap: wrap; gap: 1.6rem; justify-self: end; }
.foot__nav a {
  font-size: .86rem;
  transition: color .2s var(--ease-out);
}
.foot__nav a:hover { color: var(--accent-soft); }
.foot__legal {
  grid-column: 1 / -1;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line-d);
  font-size: .78rem;
  color: #6b6f78;
}

/* ============================================================
   视频灯箱
   ============================================================ */
.lightbox {
  --video-h: min(64vh, 600px);
  position: fixed;
  inset: 0;
  z-index: 150;
  display: grid;
  place-items: center;
  padding: clamp(1rem, 3vw, 2.5rem);
}
.lightbox[hidden] { display: none; }
.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 9, 11, .9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  opacity: 0;
  transition: opacity .3s var(--ease-out);
}
.lightbox.is-open .lightbox__backdrop { opacity: 1; }

.lightbox__panel {
  position: relative;
  display: flex;
  flex-direction: column;
  width: min(100%, 400px);
  max-height: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line-d);
  box-shadow: 0 60px 120px -40px rgba(0, 0, 0, .9);
  opacity: 0;
  transform: translate3d(0, 18px, 0) scale(.97);
  transition: opacity .34s var(--ease-out), transform .42s var(--ease-out);
}
.lightbox.is-open .lightbox__panel { opacity: 1; transform: none; }

.lightbox__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 1rem .85rem 1.25rem;
  border-bottom: 1px solid var(--line-d);
}
.lightbox__meta {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-size: .82rem;
  letter-spacing: .03em;
  color: #c9ccd3;
}
.lightbox__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #ff5f57;
  flex: none;
}
.lightbox__close {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 50%;
  color: var(--cream);
  border: 1px solid var(--line-d);
  transition: background-color .22s var(--ease-out), transform .22s var(--ease-out);
}
.lightbox__close svg { width: 17px; height: 17px; }
.lightbox__close:hover { background: rgba(255, 255, 255, .08); transform: rotate(90deg); }

.lightbox__stage {
  display: grid;
  place-items: center;
  padding: .85rem;
  min-height: 0;
  background: #08090b;
}
.lightbox__video {
  height: var(--video-h);
  width: min(100%, calc(var(--video-h) * 9 / 16));
  aspect-ratio: 9 / 16;
  object-fit: contain;
  border-radius: 14px;
  background: #000;
}
.lightbox__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .8rem 1.25rem;
  border-top: 1px solid var(--line-d);
  font-size: .76rem;
  letter-spacing: .03em;
  color: #7e828c;
}

/* ============================================================
   入场动画
   ============================================================ */
[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 22px, 0);
  transition: opacity .8s var(--ease-out), transform .9s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 85ms);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .nav__links { display: none; }
  .hero__grid { grid-template-columns: minmax(0, 1fr); }
  .hero__visual { max-width: 460px; }
  .film__inner,
  .ports__inner,
  .desk__inner { grid-template-columns: minmax(0, 1fr); }
  .film__stage { order: -1; }
  .ports__visual { order: 2; }
  .desk__visual { order: 2; }
  .spectable { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .faq__inner { grid-template-columns: minmax(0, 1fr); }
  .faq__head { position: static; }
  .bento { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bento__card--wide { grid-column: span 2; }
  .bento__card--full { grid-column: span 2; grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  .stats__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat { padding: 1.8rem 1.2rem 1.4rem 0; }
  .stat:nth-child(2n) { border-right: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--line-d); }
  .nav__actions .btn--ghost { display: none; }
  .bento { grid-template-columns: minmax(0, 1fr); }
  .bento__card--wide,
  .bento__card--full { grid-column: span 1; }
  .bento__grid-ticks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spectable { grid-template-columns: minmax(0, 1fr); }
  .portlist__row { grid-template-columns: 6rem 1fr; row-gap: .3rem; }
  .portlist__badge { grid-column: 2; justify-self: start; }
  .facts__item { grid-template-columns: minmax(0, 1fr); gap: .25rem; }
  .desk__quote { position: static; margin-top: 1.2rem; max-width: none; }
  .foot__inner { grid-template-columns: minmax(0, 1fr); }
  .foot__nav { justify-self: start; }
  .qa__body { padding-right: 0; }
  .section-lede br,
  .hero__title br { display: none; }
  .lightbox { --video-h: min(56vh, 520px); }
}

@media (max-width: 420px) {
  .player__play { width: 64px; height: 64px; }
  .player__play svg { width: 22px; height: 22px; }
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .bento__meter > span { transform: scaleX(1); }
  .marquee__track { animation: none; }
}

@media print {
  .nav, .lightbox, .marquee { display: none !important; }
}