/* 席英云官网 — 大疆风格门户 */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --bg: #ffffff;
  --bg-deep: #f5f5f5;
  --bg-elevated: #f8f8f8;
  --bg-band: #fafafa;
  --bg-card: #ffffff;
  --bg-surface: #f0f0f0;
  --bg-inverse: #000000;
  --text: #0a0a0a;
  --text-muted: rgba(0, 0, 0, 0.62);
  --text-dim: rgba(0, 0, 0, 0.42);
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.14);
  --accent: #0a0a0a;
  --accent-bright: #000000;
  --accent-soft: rgba(0, 0, 0, 0.04);
  --accent-cta: #f97316;
  --accent-warm: #f97316;
  --accent-teal: #3b82f6;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06), 0 4px 20px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 20px 48px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1), 0 32px 64px rgba(0, 0, 0, 0.08);
  --highlight: inset 0 1px 0 rgba(255, 255, 255, 0.95);
  --highlight-strong: inset 0 1px 0 rgba(255, 255, 255, 1);
  --nav-h: 64px;
  --radius: 12px;
  --font: "Outfit", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  --font-display: "Outfit", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html { scroll-behavior: smooth; }

body.portal {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* ── Ambient 流光背景 ── */
.portal-ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.portal-ambient__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(72px);
  will-change: transform, opacity;
}
.portal-ambient__orb--a {
  width: min(68vw, 720px);
  height: min(68vw, 720px);
  top: -18%;
  right: -12%;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.14) 0%, rgba(249, 115, 22, 0.04) 42%, transparent 72%);
  animation: portal-ambient-a 16s ease-in-out infinite;
}
.portal-ambient__orb--b {
  width: min(56vw, 580px);
  height: min(56vw, 580px);
  bottom: 8%;
  left: -14%;
  background: radial-gradient(circle, rgba(15, 23, 42, 0.07) 0%, rgba(59, 130, 246, 0.06) 38%, transparent 70%);
  animation: portal-ambient-b 20s ease-in-out infinite;
}
.portal-ambient__orb--c {
  width: min(44vw, 460px);
  height: min(44vw, 460px);
  top: 42%;
  left: 38%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.9) 0%, rgba(249, 115, 22, 0.05) 35%, transparent 68%);
  animation: portal-ambient-c 14s ease-in-out infinite;
}
.portal-ambient__mesh {
  position: absolute;
  inset: -20%;
  background:
    conic-gradient(from 210deg at 30% 25%, transparent 0deg, rgba(249, 115, 22, 0.04) 55deg, transparent 110deg, rgba(59, 130, 246, 0.03) 200deg, transparent 280deg),
    linear-gradient(118deg, transparent 42%, rgba(255, 255, 255, 0.55) 50%, transparent 58%);
  background-size: 100% 100%, 220% 220%;
  opacity: 0.65;
  animation: portal-ambient-mesh 22s ease-in-out infinite;
}
body.portal > main,
body.portal > footer {
  position: relative;
  z-index: 1;
}
body.portal .portal-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
}
body.portal .portal-scroll-progress {
  position: fixed;
  z-index: 9999;
}

@keyframes portal-ambient-a {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.7; }
  50% { transform: translate(-5%, 8%) scale(1.12); opacity: 1; }
}
@keyframes portal-ambient-b {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.65; }
  50% { transform: translate(7%, -6%) scale(1.1); opacity: 0.95; }
}
@keyframes portal-ambient-c {
  0%, 100% { transform: translate(0, 0) scale(0.95); opacity: 0.5; }
  50% { transform: translate(-4%, 5%) scale(1.08); opacity: 0.85; }
}
@keyframes portal-ambient-mesh {
  0%, 100% { transform: rotate(0deg) scale(1); background-position: 0% 0%, 0% 50%; opacity: 0.55; }
  50% { transform: rotate(2deg) scale(1.03); background-position: 0% 0%, 100% 50%; opacity: 0.75; }
}

/* Phase C · scroll-snap 叙事 */
body.portal.portal-snap {
  scroll-snap-type: y proximity;
}
body.portal.portal-snap .portal-snap-section {
  scroll-snap-align: start;
  scroll-snap-stop: normal;
}
body.portal.portal-snap .portal-hero {
  scroll-snap-align: start;
  scroll-snap-stop: always;
}
body.portal.portal-snap .portal-cinema {
  scroll-snap-align: start;
}

a { color: inherit; text-decoration: none; }
img, video { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ── Nav ── */
.portal-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-h);
  transition: background 0.35s, backdrop-filter 0.35s, border-color 0.35s;
  border-bottom: 1px solid transparent;
}
.portal-nav:not(.is-solid) .portal-nav__brand { color: #fff; }
.portal-nav:not(.is-solid) .portal-nav__brand img { filter: brightness(0) invert(1); }
.portal-nav:not(.is-solid) .portal-nav__link { color: rgba(255, 255, 255, 0.72); }
.portal-nav:not(.is-solid) .portal-nav__link:hover,
.portal-nav:not(.is-solid) .portal-nav__link.is-active { color: #fff; }
.portal-nav:not(.is-solid) .portal-nav__link.is-active { box-shadow: inset 0 -2px 0 #fff; }
.portal-nav:not(.is-solid) .portal-btn--primary { background: #fff; color: #0a0a0a; }
.portal-nav.is-solid .portal-nav__brand { color: var(--text); }
.portal-nav.is-solid .portal-nav__brand img { filter: none; }
.portal-nav.is-solid .portal-nav__link { color: var(--text-muted); }
.portal-nav.is-solid .portal-nav__link:hover,
.portal-nav.is-solid .portal-nav__link.is-active { color: var(--text); }
.portal-nav.is-solid .portal-nav__link.is-active { box-shadow: inset 0 -2px 0 var(--bg-inverse); }
.portal-nav.is-solid .portal-nav__toggle { color: var(--text); }
.portal-nav:not(.is-solid) .portal-nav__toggle { color: #fff; }
.portal-nav.is-solid {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
}
.portal-nav__inner {
  max-width: 1440px;
  margin: 0 auto;
  height: 100%;
  padding: 0 40px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.portal-nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  flex-shrink: 0;
}
.portal-nav__brand img { height: 28px; width: auto; }
.portal-nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.portal-nav__link {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text-muted);
  border-radius: 4px;
  transition: color 0.2s;
  cursor: pointer;
}
.portal-nav__link:hover,
.portal-nav__link.is-active { color: var(--text); }
.portal-nav__link.is-active { box-shadow: inset 0 -2px 0 var(--text); }
.portal-nav__actions { display: flex; gap: 12px; align-items: center; }
.portal-nav__toggle { display: none; font-size: 22px; padding: 4px 8px; }

.portal-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 999px;
  transition: opacity 0.2s ease, background 0.2s ease, transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
  white-space: nowrap;
  cursor: pointer;
}
.portal-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.portal-btn--primary {
  background: var(--bg-inverse);
  color: #fff;
}
.portal-btn--primary:hover { opacity: 0.9; }
.portal-btn--cta {
  background: var(--accent-cta);
  color: #fff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5), 0 0 24px rgba(249, 115, 22, 0.2);
}
.portal-btn--cta:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.55), 0 0 32px rgba(249, 115, 22, 0.28);
  transform: translateY(-1px);
}
.portal-btn--ghost {
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: #fff;
}
.portal-btn--ghost:hover { background: rgba(255, 255, 255, 0.08); }
.portal-btn--outline {
  border: 1px solid var(--line-strong);
  color: var(--text);
  background: transparent;
}
.portal-btn--outline:hover {
  background: var(--bg-surface);
  border-color: var(--bg-inverse);
}
.portal-btn--sm { padding: 8px 18px; font-size: 13px; }

/* ── Hero (dark overlay, white type) ── */
.portal-hero {
  color: #fff;
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
}
.portal-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  will-change: transform;
  transition: transform 0.1s linear;
}
.portal-hero__media video,
.portal-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.08);
  animation: portal-hero-breathe 10s ease-in-out infinite;
  will-change: transform;
}
.portal-hero__overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(0, 0, 0, 0.72) 0%, rgba(0, 0, 0, 0.28) 16%, transparent 34%),
    linear-gradient(to top, rgba(0, 0, 0, 0.94) 0%, rgba(0, 0, 0, 0.52) 42%, rgba(0, 0, 0, 0.18) 72%, transparent 100%);
  z-index: 1;
  animation: portal-overlay-breathe 7s ease-in-out infinite;
}
.portal-hero__body {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1440px;
  padding: calc(var(--nav-h) + 48px) 40px 96px;
  text-align: center;
  will-change: opacity;
  transition: opacity 0.2s var(--ease-out);
}
.portal-hero__series {
  font-size: clamp(13px, 1.5vw, 15px);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.68);
  margin-bottom: 14px;
}
.portal-hero__title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 68px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.04em;
  margin-bottom: 18px;
  color: #ffffff;
  text-shadow: 0 4px 32px rgba(0, 0, 0, 0.65), 0 1px 0 rgba(255, 255, 255, 0.08);
}
.portal-hero.is-ready .portal-hero__series {
  animation: portal-hero-in 0.85s var(--ease-out) both;
}
.portal-hero.is-ready .portal-hero__title {
  animation: portal-hero-in 0.95s var(--ease-out) 0.1s both;
}
.portal-hero.is-ready .portal-hero__tagline {
  animation: portal-hero-in 0.95s var(--ease-out) 0.22s both;
}
.portal-hero.is-ready .portal-hero__actions {
  animation: portal-hero-in 0.95s var(--ease-out) 0.34s both;
}
.portal-hero__tagline {
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.72);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.6;
}
.portal-hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Product spotlight (full-width cards) ── */
.portal-spotlight {
  background: var(--bg);
  border-top: 1px solid var(--line);
}
.portal-spotlight__item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 520px;
  border-bottom: 1px solid var(--line);
}
.portal-spotlight__item:nth-child(even) .portal-spotlight__visual { order: 2; }
.portal-spotlight__item:nth-child(even) .portal-spotlight__copy { order: 1; }
.portal-spotlight__copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 64px 56px;
}
.portal-spotlight__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.portal-spotlight__name {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 600;
  line-height: 1.15;
  margin-bottom: 16px;
}
.portal-spotlight__desc {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 440px;
}
.portal-spotlight__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}
.portal-spotlight__tag {
  font-size: 12px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-muted);
}
.portal-spotlight__visual {
  position: relative;
  background: var(--bg-elevated);
  overflow: hidden;
  min-height: 320px;
}
.portal-spotlight__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

/* ── Horizontal product rail ── */
.portal-rail {
  padding: 80px 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--line);
  overflow: hidden;
}
.portal-rail__head {
  max-width: 1440px;
  margin: 0 auto 40px;
  padding: 0 40px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}
.portal-rail__title {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 600;
}
.portal-rail__hint { font-size: 14px; color: var(--text-dim); }
.portal-rail__track {
  display: flex;
  gap: 20px;
  padding: 0 40px 8px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.portal-rail__track::-webkit-scrollbar { display: none; }
.portal-rail__card {
  flex: 0 0 min(340px, 78vw);
  scroll-snap-align: start;
  background: var(--bg-card);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  transition: border-color 0.25s;
}
.portal-rail__card:hover { border-color: rgba(255, 255, 255, 0.25); }
.portal-rail__card img {
  aspect-ratio: 16/10;
  width: 100%;
  object-fit: cover;
  object-position: top;
}
.portal-rail__card-body { padding: 20px 22px 24px; }
.portal-rail__card-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.portal-rail__card-name {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}
.portal-rail__card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 16px;
}
.portal-rail__card-link {
  font-size: 14px;
  color: var(--accent);
}

/* ── Domain cards (3-col) ── */
.portal-domains {
  padding: 80px 40px;
  max-width: 1440px;
  margin: 0 auto;
}
.portal-domains__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  background: transparent;
  border: none;
  border-radius: 0;
  overflow: visible;
}
.portal-domain {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 28px;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.25s var(--ease-out), transform 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
  box-shadow: var(--shadow-sm), var(--highlight);
}
.portal-domain:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md), var(--highlight-strong);
}
.portal-domain__link {
  margin-top: 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}
.portal-domain__link:hover { color: var(--text); }
.portal-domain__name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}
.portal-domain__desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}
.portal-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, 0.12);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background-color: var(--bg-inverse);
}
.portal-stat {
  background: var(--bg-inverse);
  padding: 48px 32px;
  text-align: center;
}
.portal-stat b {
  display: block;
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 800;
  margin-bottom: 8px;
  color: #ffffff;
  letter-spacing: -0.02em;
}
.portal-stat span {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
}

/* ── Customers carousel ── */
.portal-customers {
  padding: 80px 40px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(6px);
  border-top: 1px solid var(--line);
  overflow: visible;
}
.portal-customers__inner {
  max-width: 1440px;
  margin: 0 auto;
  overflow: visible;
}
.portal-customers__lead {
  text-align: center;
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.65;
}
.portal-carousel {
  width: 80%;
  margin: 0 auto;
  position: relative;
  padding: 0 36px;
}
.portal-carousel__stage {
  perspective: 1400px;
  overflow: visible;
  height: 400px;
  position: relative;
}
.portal-carousel__track {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
}
.portal-carousel__slide {
  position: absolute;
  width: min(50%, 560px);
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(0.5);
  opacity: 0;
  transition: transform 0.75s var(--ease-out), opacity 0.75s var(--ease-out), filter 0.75s;
  pointer-events: none;
  z-index: 1;
  filter: blur(1px);
}
.portal-carousel__slide.is-active {
  transform: translate(-50%, -50%) scale(1) rotateY(0deg);
  opacity: 1;
  z-index: 10;
  pointer-events: auto;
  filter: none;
}
.portal-carousel__slide.is-left-1 {
  transform: translate(calc(-50% - 50%), -50%) scale(0.76) rotateY(12deg);
  opacity: 0.7;
  z-index: 6;
  pointer-events: auto;
  filter: none;
}
.portal-carousel__slide.is-left-2 {
  transform: translate(calc(-50% - 86%), -50%) scale(0.6) rotateY(18deg);
  opacity: 0.38;
  z-index: 4;
  pointer-events: auto;
}
.portal-carousel__slide.is-right-1 {
  transform: translate(calc(-50% + 50%), -50%) scale(0.76) rotateY(-12deg);
  opacity: 0.7;
  z-index: 6;
  pointer-events: auto;
  filter: none;
}
.portal-carousel__slide.is-right-2 {
  transform: translate(calc(-50% + 86%), -50%) scale(0.6) rotateY(-18deg);
  opacity: 0.38;
  z-index: 4;
  pointer-events: auto;
}
.portal-carousel__slide.is-hidden {
  transform: translate(-50%, -50%) scale(0.45);
  opacity: 0;
  z-index: 0;
  pointer-events: none;
}
.portal-carousel__card {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  min-height: 360px;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
}
.portal-carousel__visual {
  position: relative;
  background-color: var(--bg-surface);
  background-size: cover;
  background-position: center;
  min-height: 280px;
}
.portal-carousel__visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 35%, rgba(255, 255, 255, 0.15) 55%, #fff 78%);
}
.portal-carousel__body {
  padding: 40px 36px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: #fff;
}
.portal-carousel__logo {
  width: 140px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  padding: 10px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.portal-carousel__logo img {
  max-width: 100%;
  max-height: 36px;
  width: auto;
  height: auto;
  object-fit: contain;
}
.portal-carousel__name {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.5vw, 28px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  color: var(--text);
}
.portal-carousel__meta {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 14px;
}
.portal-carousel__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 18px;
}
.portal-carousel__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.portal-carousel__tag {
  font-size: 12px;
  padding: 5px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text);
  background: var(--bg);
}
.portal-carousel__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-inverse);
  color: #fff;
  font-size: 22px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: opacity 0.2s, transform 0.2s var(--ease-out);
  z-index: 20;
}
.portal-carousel__btn:hover { opacity: 0.88; transform: translateY(-50%) scale(1.04); }
.portal-carousel__btn--prev { left: 0; }
.portal-carousel__btn--next { right: 0; }
.portal-carousel__dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
}
.portal-carousel__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line-strong);
  padding: 0;
  transition: background 0.25s, transform 0.25s;
}
.portal-carousel__dot.is-active {
  background: var(--bg-inverse);
  transform: scale(1.2);
}

/* ── About / culture ── */
.portal-about {
  padding: 80px 40px;
  max-width: 1440px;
  margin: 0 auto;
}
.portal-about__intro {
  font-size: clamp(18px, 2.5vw, 24px);
  line-height: 1.55;
  color: var(--text-muted);
  max-width: 820px;
  margin-bottom: 48px;
}
.portal-about__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.portal-about__card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm), var(--highlight);
  transition: box-shadow 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}
.portal-about__card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md), var(--highlight-strong);
}
.portal-about__card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}
.portal-about__card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ── News ── */
.portal-news {
  padding: 80px 40px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--line);
}
.portal-news__inner { max-width: 1440px; margin: 0 auto; }
.portal-news__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.portal-news__card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow 0.25s var(--ease-out), border-color 0.25s var(--ease-out), transform 0.25s var(--ease-out);
  box-shadow: var(--shadow-sm), var(--highlight);
}
.portal-news__card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md), var(--highlight-strong);
  transform: translateY(-2px);
}
.portal-news__cat {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.portal-news__card h4 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 10px;
}
.portal-news__card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}
.portal-news__date { font-size: 12px; color: var(--text-dim); }

/* ── Contact ── */
.portal-contact {
  padding: 80px 40px;
  max-width: 1440px;
  margin: 0 auto;
}
.portal-contact__qr {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  justify-content: center;
  margin-bottom: 48px;
}
.portal-contact__qr-item {
  text-align: center;
}
.portal-contact__qr-item img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  margin: 0 auto 12px;
  background: #fff;
  padding: 6px;
}
.portal-contact__qr-item strong {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
}
.portal-contact__qr-item span {
  font-size: 12px;
  color: var(--text-dim);
}
.portal-contact__panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding: 48px;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.portal-contact__info p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
}
.portal-contact__meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}
.portal-contact__actions { display: flex; gap: 12px; flex-wrap: wrap; }
.portal-form label {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.portal-form input,
.portal-form select,
.portal-form textarea {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 16px;
}
.portal-form textarea { min-height: 100px; resize: vertical; }
.portal-form input:focus,
.portal-form select:focus,
.portal-form textarea:focus {
  outline: none;
  border-color: rgba(0, 0, 0, 0.35);
}

/* ── Footer (black inverse band) ── */
.portal-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--bg-inverse);
  color: #fff;
  padding: 56px 40px 32px;
}
.portal-footer .portal-nav__brand {
  color: #fff;
}
.portal-footer .portal-nav__brand img {
  filter: brightness(0) invert(1);
}
.portal-footer__inner {
  max-width: 1440px;
  margin: 0 auto;
}
.portal-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}
.portal-footer__tag {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.6;
  margin-top: 12px;
  max-width: 280px;
}
.portal-footer h5 {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
  color: rgba(255, 255, 255, 0.68);
}
.portal-footer ul { list-style: none; }
.portal-footer li { margin-bottom: 10px; }
.portal-footer a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  transition: color 0.2s;
}
.portal-footer a:hover { color: #fff; }
.portal-footer__qr {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}
.portal-footer__qr img {
  width: 64px;
  height: 64px;
  border-radius: 6px;
  background: #fff;
  padding: 4px;
}
.portal-footer__base {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.42);
}

/* ── Reveal & motion ── */
@keyframes portal-hero-breathe {
  0%, 100% { transform: scale(1.06); }
  50% { transform: scale(1.12); }
}
@keyframes portal-overlay-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.82; }
}
@keyframes portal-hero-in {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: none; }
}
@keyframes portal-stat-pop {
  from { opacity: 0; transform: scale(0.88) translateY(12px); }
  to { opacity: 1; transform: none; }
}

.portal-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.portal-reveal.is-visible {
  opacity: 1;
  transform: none;
}
.portal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.portal-stagger.is-visible > *,
.portal-stagger.is-visible {
  opacity: 1;
  transform: none;
}
.portal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.portal-stagger.is-visible > *:nth-child(2) { transition-delay: 70ms; }
.portal-stagger.is-visible > *:nth-child(3) { transition-delay: 140ms; }
.portal-stagger.is-visible > *:nth-child(4) { transition-delay: 210ms; }
.portal-stagger.is-visible > *:nth-child(5) { transition-delay: 280ms; }
.portal-stagger.is-visible > *:nth-child(6) { transition-delay: 350ms; }
.portal-stats.is-visible .portal-stat {
  animation: portal-stat-pop 0.7s var(--ease-out) both;
}
.portal-stats.is-visible .portal-stat:nth-child(1) { animation-delay: 0ms; }
.portal-stats.is-visible .portal-stat:nth-child(2) { animation-delay: 80ms; }
.portal-stats.is-visible .portal-stat:nth-child(3) { animation-delay: 160ms; }
.portal-stats.is-visible .portal-stat:nth-child(4) { animation-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  .portal-hero__media video,
  .portal-hero__media img,
  .portal-hero__overlay,
  .portal-hero.is-ready .portal-hero__series,
  .portal-hero.is-ready .portal-hero__title,
  .portal-hero.is-ready .portal-hero__tagline,
  .portal-hero.is-ready .portal-hero__actions,
  .portal-ambient__orb,
  .portal-ambient__mesh,
  .portal-band::before {
    animation: none !important;
  }
}

.portal-scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--bg-inverse);
  transform-origin: left;
  transform: scaleX(0);
  z-index: 9999;
  pointer-events: none;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .portal-spotlight__item { grid-template-columns: 1fr; }
  .portal-spotlight__item:nth-child(even) .portal-spotlight__visual { order: 0; }
  .portal-spotlight__item:nth-child(even) .portal-spotlight__copy { order: 0; }
  .portal-domains__grid { grid-template-columns: 1fr; }
  .portal-stats { grid-template-columns: repeat(2, 1fr); }
  .portal-about__grid,
  .portal-news__grid { grid-template-columns: 1fr; }
  .portal-contact__panel { grid-template-columns: 1fr; }
  .portal-footer__grid { grid-template-columns: 1fr 1fr; }
}

/* ── Compact feature grid (no oversized images) ── */
/* ── Atmospheric content bands (DJI-style layered sections) ── */
.portal-band {
  position: relative;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.portal-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(249, 115, 22, 0.04), rgba(59, 130, 246, 0.03), transparent);
  background-size: 200% 100%;
  animation: portal-band-shimmer 14s ease-in-out infinite;
  pointer-events: none;
}
@keyframes portal-band-shimmer {
  0%, 100% { background-position: 0% 50%; opacity: 0.4; }
  50% { background-position: 100% 50%; opacity: 0.85; }
}
.portal-band__inner {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: 80px 40px;
}

.portal-section {
  padding: 72px 40px;
  max-width: 1440px;
  margin: 0 auto;
}
.portal-section.portal-band {
  padding: 0;
  max-width: none;
}
body.portal.portal-snap .portal-section.portal-snap-section {
  min-height: min(100vh, 100svh);
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: none;
}
.portal-section--wide { max-width: none; padding-left: 0; padding-right: 0; }

/* Section header — clear hierarchy (Trust & Authority pattern) */
.portal-section-head {
  margin-bottom: 40px;
  max-width: 640px;
}
.portal-section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.portal-section-head__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.portal-section-head__title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.8vw, 40px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin-bottom: 12px;
}
.portal-section-head__lead {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-muted);
}

.portal-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.portal-feature {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(6px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: box-shadow 0.35s var(--ease-out), transform 0.35s var(--ease-out), border-color 0.35s var(--ease-out);
  cursor: default;
  box-shadow: var(--shadow-sm), var(--highlight);
}
.portal-feature:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md), var(--highlight-strong);
  transform: translateY(-5px);
}
.portal-feature__icon {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding: 5px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  width: fit-content;
}
.portal-feature__shot {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  background: #000;
  height: 172px;
  box-shadow: inset 0 8px 24px rgba(0, 0, 0, 0.4);
}
.portal-feature__body {
  padding: 24px 24px 0;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.portal-feature__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.3;
}
.portal-feature__desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}
.portal-feature__shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform 0.5s var(--ease-out);
}
.portal-feature:hover .portal-feature__shot img {
  transform: scale(1.03);
}

/* Compact showcase: text + bounded image frame */
.portal-showcase {
  display: grid;
  grid-template-columns: 1fr min(42%, 480px);
  gap: 48px;
  align-items: center;
  padding: 80px 40px;
  max-width: 1440px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}
.portal-showcase--alt {
  background: var(--bg-elevated);
  max-width: none;
  padding-left: max(40px, calc((100% - 1440px) / 2 + 40px));
  padding-right: max(40px, calc((100% - 1440px) / 2 + 40px));
}
.portal-showcase__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.portal-showcase--flip { grid-template-columns: min(42%, 480px) 1fr; }
.portal-showcase--flip .portal-showcase__frame { order: -1; }
.portal-showcase__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin-bottom: 14px;
}
.portal-showcase__desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}
.portal-showcase__list {
  list-style: none;
  font-size: 13px;
  color: var(--text-muted);
}
.portal-showcase__list li {
  padding: 6px 0;
  padding-left: 14px;
  position: relative;
}
.portal-showcase__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-dim);
}
.portal-showcase__frame {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: #000;
  max-height: 320px;
  box-shadow: var(--shadow-lg), var(--highlight);
}
.portal-showcase__frame img {
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  object-position: top;
  display: block;
}

.portal-hero--split .portal-hero__body {
  text-align: left;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: end;
}
.portal-hero--split .portal-hero__tagline { margin-left: 0; }
.portal-hero--split .portal-hero__actions { justify-content: flex-start; }

.portal-subnav {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}
.portal-subnav__inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.portal-subnav__inner::-webkit-scrollbar { display: none; }
.portal-subnav a {
  flex-shrink: 0;
  padding: 14px 16px;
  font-size: 13px;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.portal-subnav a:hover { color: var(--text); }
.portal-subnav a.is-active {
  color: var(--text);
  border-bottom-color: var(--bg-inverse);
}

/* 无视频 Hero 的子页（工地智能体等）— 导航始终浅色模式 */
body.portal.portal-page-static .portal-nav,
body.portal:has(.portal-hero--demo) .portal-nav {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
}
body.portal.portal-page-static .portal-nav .portal-nav__brand,
body.portal:has(.portal-hero--demo) .portal-nav .portal-nav__brand { color: var(--text); }
body.portal.portal-page-static .portal-nav .portal-nav__brand img,
body.portal:has(.portal-hero--demo) .portal-nav .portal-nav__brand img { filter: none; }
body.portal.portal-page-static .portal-nav .portal-nav__link,
body.portal:has(.portal-hero--demo) .portal-nav .portal-nav__link { color: var(--text-muted); }
body.portal.portal-page-static .portal-nav .portal-nav__link:hover,
body.portal.portal-page-static .portal-nav .portal-nav__link.is-active,
body.portal:has(.portal-hero--demo) .portal-nav .portal-nav__link:hover,
body.portal:has(.portal-hero--demo) .portal-nav .portal-nav__link.is-active { color: var(--text); }
body.portal.portal-page-static .portal-nav .portal-nav__link.is-active,
body.portal:has(.portal-hero--demo) .portal-nav .portal-nav__link.is-active { box-shadow: inset 0 -2px 0 var(--bg-inverse); }
body.portal.portal-page-static .portal-nav .portal-nav__toggle,
body.portal:has(.portal-hero--demo) .portal-nav .portal-nav__toggle { color: var(--text); }

@media (max-width: 1024px) {
  .portal-feature-grid { grid-template-columns: repeat(2, 1fr); }
  .portal-cinema { grid-template-columns: 1fr; min-height: auto; }
  .portal-cinema--flip .portal-cinema__visual,
  .portal-cinema--flip .portal-cinema__copy { order: unset; }
  .portal-cinema__visual { min-height: 280px; }
  .portal-cinema__visual::after,
  .portal-cinema--flip .portal-cinema__visual::after {
    background: linear-gradient(to top, var(--bg-elevated) 0%, transparent 40%);
  }
  .portal-cinema__copy { padding: 40px 24px 48px; }
  .portal-cinema__idx { font-size: 48px; }
  .portal-showcase,
  .portal-showcase--flip {
    grid-template-columns: 1fr;
  }
  .portal-showcase--flip .portal-showcase__frame { order: 0; }
  .portal-hero--split .portal-hero__body { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .portal-section { padding: 56px 20px; }
  .portal-band__inner { padding: 56px 20px; }
  .portal-feature-grid { grid-template-columns: 1fr; }
  .portal-showcase { padding: 48px 20px; }
  .portal-nav__inner { padding: 0 20px; }
  .portal-nav__toggle { display: block; margin-left: auto; }
  .portal-nav__links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.98);
    padding: 16px 20px 24px;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
  }
  .portal-nav__links.is-open { display: flex; }
  .portal-nav__actions { display: none; }
  .portal-hero__body { padding: calc(var(--nav-h) + 32px) 20px 56px; }
  .portal-spotlight__copy { padding: 40px 24px; }
  .portal-rail__head,
  .portal-rail__track { padding-left: 20px; padding-right: 20px; }
  .portal-domains,
  .portal-about,
  .portal-news,
  .portal-contact,
  .portal-customers { padding-left: 20px; padding-right: 20px; }
  .portal-footer { padding-left: 20px; padding-right: 20px; }
  .portal-footer__grid { grid-template-columns: 1fr; }
  .portal-carousel { width: 100%; padding: 0 40px; }
  .portal-carousel__stage { height: auto; min-height: 420px; perspective: 900px; }
  .portal-carousel__slide { width: 88%; }
  .portal-carousel__slide.is-left-1 { transform: translate(calc(-50% - 38%), -50%) scale(0.72) rotateY(10deg); }
  .portal-carousel__slide.is-left-2 { transform: translate(calc(-50% - 62%), -50%) scale(0.58) rotateY(14deg); opacity: 0.28; }
  .portal-carousel__slide.is-right-1 { transform: translate(calc(-50% + 38%), -50%) scale(0.72) rotateY(-10deg); }
  .portal-carousel__slide.is-right-2 { transform: translate(calc(-50% + 62%), -50%) scale(0.58) rotateY(-14deg); opacity: 0.28; }
  .portal-carousel__card { grid-template-columns: 1fr; min-height: auto; }
  .portal-carousel__visual { min-height: 200px; }
  .portal-carousel__visual::after {
    background: linear-gradient(to bottom, transparent 50%, #fff 100%);
  }
  .portal-carousel__body { padding: 28px 24px 32px; }
  .portal-carousel__btn--prev { left: 8px; }
  .portal-carousel__btn--next { right: 8px; }
}