:root {
  --ink: #07111f;
  --ink-2: #0c1a2e;
  --slate: #16324f;
  --fog: #c7d4e3;
  --paper: #f2eee6;
  --amber: #e39b4a;
  --amber-deep: #c07830;
  --teal: #3db8a8;
  --line: rgba(242, 238, 230, 0.14);
  --text: #f2eee6;
  --muted: rgba(242, 238, 230, 0.72);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.45);
  --font-display: "Syne", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --font-body: "Manrope", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 1120px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(227, 155, 74, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 20%, rgba(61, 184, 168, 0.12), transparent 50%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 45%, #091525 100%);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: clip;
  min-width: 0;
}

body.is-intro {
  overflow: hidden;
}

body.is-intro .site-header,
body.is-intro main,
body.is-intro .site-footer {
  opacity: 0;
  pointer-events: none;
}

.intro {
  position: fixed;
  inset: 0;
  z-index: 100;
  background:
    radial-gradient(ellipse 70% 55% at 50% 40%, rgba(22, 50, 79, 0.55), transparent 65%),
    radial-gradient(ellipse 50% 40% at 15% 80%, rgba(227, 155, 74, 0.12), transparent 55%),
    radial-gradient(ellipse 45% 35% at 85% 20%, rgba(61, 184, 168, 0.14), transparent 50%),
    #050b14;
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease), visibility 0.75s;
}

.intro.is-done {
  opacity: 0;
  transform: scale(1.04);
  visibility: hidden;
  pointer-events: none;
}

main,
.site-footer {
  transition: opacity 0.6s var(--ease);
}

.intro-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.intro-ui {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(1.25rem + env(safe-area-inset-bottom, 0px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 calc(1rem + env(safe-area-inset-right, 0px)) 0 calc(1rem + env(safe-area-inset-left, 0px));
  pointer-events: none;
}

.intro-caption {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(242, 238, 230, 0.55);
}

.intro-skip {
  pointer-events: auto;
  appearance: none;
  border: 1px solid rgba(242, 238, 230, 0.22);
  background: rgba(7, 17, 31, 0.45);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font-size: 0.82rem;
  backdrop-filter: blur(8px);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.intro-skip:hover {
  color: var(--text);
  border-color: rgba(227, 155, 74, 0.55);
  background: rgba(7, 17, 31, 0.7);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
.btn {
  cursor: pointer;
  font: inherit;
}

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding:
    calc(0.85rem + env(safe-area-inset-top, 0px))
    calc(1rem + env(safe-area-inset-right, 0px))
    0.85rem
    calc(1rem + env(safe-area-inset-left, 0px));
  backdrop-filter: blur(14px);
  background: rgba(7, 17, 31, 0.55);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(7, 17, 31, 0.82);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  min-width: 0;
}

.brand-logo {
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  display: block;
  object-fit: contain;
  /* PNG already has squircle corners; don't re-round */
  border-radius: 0;
  box-shadow: none;
}

.brand-text {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  min-width: 0;
  line-height: 1;
}

.brand-zh {
  font-size: 1.15rem;
  line-height: 1;
}

.brand-en {
  font-size: 0.92rem;
  color: var(--muted);
  font-weight: 500;
  line-height: 1;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav a {
  color: var(--muted);
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.nav a:hover {
  color: var(--paper);
}

.hero {
  position: relative;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  overflow: visible;
  /* Keep poster clear of fixed header */
  padding-top: calc(3.6rem + env(safe-area-inset-top, 0px));
}

.hero-media {
  position: relative;
  inset: auto;
  z-index: 0;
  width: 100%;
  flex: 0 0 auto;
  background: #050b14;
}

.hero-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  object-position: center top;
  transform: none;
}

/* PC / tablet: landscape promo only */
.hero-img-desktop {
  display: block;
}

.hero-img-mobile {
  display: none;
}

/* Poster already has copy; don't veil or decorate over it */
.hero-veil,
.hero-orbit {
  display: none;
}

@keyframes orbit-spin {
  to {
    transform: rotate(360deg);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  padding: 1.75rem 0 2.5rem;
}

.hero-brand {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5.2rem);
  line-height: 0.92;
  letter-spacing: -0.05em;
  font-weight: 800;
  margin: 0 0 1rem;
}

.hero-brand .hero-kicker {
  display: block;
  font-size: 0.28em;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  font-weight: 600;
  margin-bottom: 0.55rem;
}

.hero-lead {
  display: block;
  max-width: 34rem;
  margin: 0 0 1.75rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
  text-align: center;
  word-break: keep-all;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--amber) 0%, var(--amber-deep) 100%);
  color: #1a1208;
  font-weight: 700;
}

.btn-ghost {
  border-color: rgba(242, 238, 230, 0.28);
  color: var(--paper);
  background: rgba(255, 255, 255, 0.04);
}

.btn-ghost:hover {
  border-color: rgba(242, 238, 230, 0.5);
  background: rgba(255, 255, 255, 0.08);
}

.section {
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  padding: 5.5rem 0;
}

.section-kicker {
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 0.75rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 0 0 0.85rem;
  max-width: 16ch;
}

.section-copy {
  max-width: 40rem;
  color: var(--muted);
  margin: 0 0 2.5rem;
}

.route-panel {
  display: grid;
  gap: 1.25rem;
  padding: 1.5rem 1.4rem;
  border-radius: 24px;
  border: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(61, 184, 168, 0.14), transparent 42%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
}

.route-panel p {
  margin: 0;
  color: var(--muted);
}

.route-panel strong {
  color: var(--paper);
}

.route-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
}

.route-facts p {
  margin: 0;
  padding: 0.9rem 0.95rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.route-facts span {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--amber);
  font-family: var(--font-display);
  letter-spacing: -0.03em;
}

.route-note {
  font-size: 0.92rem;
  color: rgba(242, 238, 230, 0.58);
}

.feature-rail {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.feature-item {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.25rem;
  align-items: start;
  padding: 1.55rem 0;
  border-bottom: 1px solid var(--line);
}

.feature-index {
  font-family: var(--font-display);
  color: var(--amber);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  padding-top: 0.15rem;
}

.feature-item h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
  max-width: 42rem;
}

.shot-stage {
  display: grid;
  gap: 1.25rem;
}

.shot-main {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: #000;
}

.shot-main img {
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
  background: #050b14;
}

.shot-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
}

.shot-thumb {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  padding: 0;
  background: #000;
  opacity: 0.72;
  transition: opacity 0.25s ease, transform 0.25s var(--ease), border-color 0.25s ease;
}

.shot-thumb.is-active,
.shot-thumb:hover {
  opacity: 1;
  border-color: rgba(227, 155, 74, 0.55);
  transform: translateY(-2px);
}

.shot-thumb img {
  width: 100%;
  aspect-ratio: 5 / 4;
  object-fit: contain;
  object-position: center;
  background: #050b14;
}

.protocol-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.support-block {
  margin-top: 2.75rem;
}

.support-heading {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: -0.03em;
}

.support-note {
  margin: 1rem 0 0.65rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.support-block > .support-note:first-of-type {
  margin-top: 0;
}

.support-list {
  display: grid;
  gap: 0.75rem;
}

.support-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem 1.1rem 1.05rem;
  background: rgba(255, 255, 255, 0.03);
}

.support-card h4 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: -0.03em;
}

.support-meta {
  margin: 0.25rem 0 0.75rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.support-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1.25rem;
}

.support-card p,
.support-plain {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.support-label {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--amber);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.support-plain {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.support-plain li {
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line);
}

.support-plain li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.support-plain strong {
  color: var(--paper);
  margin-right: 0.45rem;
}

.faq-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 0;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 0;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  color: var(--amber);
  font-size: 1.25rem;
  line-height: 1;
  transition: transform 0.25s var(--ease);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin: 0 0 1.25rem;
  color: var(--muted);
  max-width: 42rem;
}

.faq-item a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.protocol-chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.55rem 0.95rem;
  color: var(--fog);
  background: rgba(255, 255, 255, 0.03);
  font-size: 0.92rem;
}

.download-panel {
  display: grid;
  gap: 1.5rem;
  padding: 2rem;
  border-radius: 24px;
  border: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(227, 155, 74, 0.12), transparent 45%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
}

.download-panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: -0.04em;
  margin: 0;
}

.download-panel p {
  margin: 0;
  color: var(--muted);
  max-width: 38rem;
}

.download-note {
  font-size: 0.92rem;
  color: rgba(242, 238, 230, 0.58);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 1.25rem 3rem;
  color: rgba(242, 238, 230, 0.55);
  font-size: 0.9rem;
}

.site-footer-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: calc(var(--d, 0) * 90ms);
}

/* ---------- Ambient layers ---------- */

.scroll-progress {
  position: fixed;
  inset: 0 0 auto;
  height: 2px;
  z-index: 60;
  transform-origin: 0 50%;
  transform: scaleX(var(--progress, 0));
  background: linear-gradient(90deg, var(--teal), var(--amber) 60%, #ffe2a0);
  box-shadow: 0 0 12px rgba(227, 155, 74, 0.6);
  pointer-events: none;
}

.ambient {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.2s ease;
}

.ambient.is-on {
  opacity: 1;
}

main,
.site-footer {
  position: relative;
  z-index: 1;
}

/* ---------- Hero ---------- */

.hero-word {
  display: inline-block;
  background: linear-gradient(
    100deg,
    #f2eee6 0%,
    #f2eee6 38%,
    #ffe0a6 46%,
    #f6b860 50%,
    #ffe0a6 54%,
    #f2eee6 62%,
    #f2eee6 100%
  );
  background-size: 260% 100%;
  background-position: 100% 0;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 6px 28px rgba(227, 155, 74, 0.28));
}

.hero-brand.is-in .hero-word {
  animation: word-shine 5.5s var(--ease) 0.4s infinite;
}

@keyframes word-shine {
  0% {
    background-position: 100% 0;
  }
  45%,
  100% {
    background-position: 0% 0;
  }
}

.btn {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.55) 50%, transparent 70%);
  transform: translateX(-120%);
  animation: btn-sheen 3.6s ease-in-out 1.2s infinite;
}

.btn-primary {
  box-shadow: 0 10px 30px rgba(227, 155, 74, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 14px 38px rgba(227, 155, 74, 0.45);
}

@keyframes btn-sheen {
  0%,
  55% {
    transform: translateX(-120%);
  }
  80%,
  100% {
    transform: translateX(120%);
  }
}

/* ---------- Stats ---------- */

.stats {
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(7, 17, 31, 0.55);
  backdrop-filter: blur(10px);
  transform: none;
  margin-top: 0.25rem;
  position: relative;
  z-index: 2;
}

.stat {
  padding: 1.4rem 1.25rem;
  border-left: 1px solid var(--line);
}

.stat:first-child {
  border-left: 0;
}

.stat-num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  background: linear-gradient(180deg, #ffe7bd, var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.stat-num small {
  font-size: 0.55em;
  margin-left: 0.1em;
}

.stat-label {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ---------- Sections ---------- */

.section-kicker::before {
  content: "";
  display: inline-block;
  vertical-align: middle;
  width: 0;
  height: 1px;
  margin-right: 0;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
  transition: width 0.8s var(--ease) 0.15s, margin-right 0.8s var(--ease) 0.15s;
}

.section-kicker.is-in::before {
  width: 2.2rem;
  margin-right: 0.7rem;
}

.feature-item {
  position: relative;
  transition: background 0.35s ease, padding-left 0.35s var(--ease);
}

.feature-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--amber), var(--teal));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.45s var(--ease);
}

.feature-item:hover {
  background: linear-gradient(90deg, rgba(227, 155, 74, 0.08), transparent 70%);
  padding-left: 0.9rem;
}

.feature-item:hover::before {
  transform: scaleY(1);
}

.feature-item:hover .feature-index {
  text-shadow: 0 0 14px rgba(227, 155, 74, 0.8);
}

.shot-main {
  position: relative;
  transform: perspective(1200px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transition: transform 0.5s var(--ease), box-shadow 0.5s ease;
  will-change: transform;
}

.shot-main.is-tilting {
  transition: transform 0.12s linear, box-shadow 0.5s ease;
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(227, 155, 74, 0.25);
}

.shot-main::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 0%), rgba(255, 236, 200, 0.14), transparent 45%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.shot-main.is-tilting::after {
  opacity: 1;
}

.shot-main img {
  transition: opacity 0.35s ease, transform 0.5s var(--ease);
}

.shot-main.is-swapping img {
  opacity: 0;
  transform: scale(0.985);
}

.protocol-chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: border-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease, transform 0.25s var(--ease);
}

.protocol-chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 0 rgba(61, 184, 168, 0.6);
  animation: chip-ping 2.8s ease-out infinite;
  animation-delay: calc(var(--i, 0) * 0.25s);
}

.protocol-chip-off {
  color: rgba(242, 238, 230, 0.45);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

.protocol-chip-off::before {
  background: rgba(242, 238, 230, 0.28);
  box-shadow: none;
  animation: none;
}

.protocol-chip:hover {
  color: var(--paper);
  border-color: rgba(227, 155, 74, 0.55);
  box-shadow: 0 0 22px rgba(227, 155, 74, 0.18);
  transform: translateY(-2px);
}

.protocol-wrap.reveal.is-in .protocol-chip {
  animation: chip-in 0.55s var(--ease) both;
  animation-delay: calc(var(--i, 0) * 55ms + 120ms);
}

@keyframes chip-in {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.92);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes chip-ping {
  0% {
    box-shadow: 0 0 0 0 rgba(61, 184, 168, 0.6);
  }
  70%,
  100% {
    box-shadow: 0 0 0 7px rgba(61, 184, 168, 0);
  }
}

@property --angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}

.download-panel {
  position: relative;
  isolation: isolate;
  border-color: transparent;
}

.download-panel::before {
  content: "";
  position: absolute;
  inset: -1px;
  z-index: -1;
  border-radius: inherit;
  padding: 1px;
  background: conic-gradient(
    from var(--angle),
    rgba(242, 238, 230, 0.14) 0deg,
    rgba(242, 238, 230, 0.14) 200deg,
    var(--amber) 260deg,
    var(--teal) 310deg,
    rgba(242, 238, 230, 0.14) 360deg
  );
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  animation: angle-spin 6s linear infinite;
}

@keyframes angle-spin {
  to {
    --angle: 360deg;
  }
}

@media (max-width: 900px) {
  .shot-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav {
    gap: 0.85rem;
  }

  .nav .nav-hide-sm {
    display: none;
  }

  .section {
    width: min(100% - 2rem, var(--max));
    padding: 4rem 0;
  }

  .shot-main {
    border-radius: 14px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .brand {
    gap: 0.55rem;
  }

  .brand-logo {
    width: 28px;
    height: 28px;
  }

  .brand-zh {
    font-size: 1.02rem;
  }

  .brand-en {
    font-size: 0.8rem;
  }

  .hero {
    padding-top: calc(3.4rem + env(safe-area-inset-top, 0px));
  }

  .hero-img-desktop {
    display: none;
  }

  .hero-img-mobile {
    display: block;
  }

  .hero-content {
    width: min(100% - 1.5rem, var(--max));
    padding: 1.35rem 0 calc(2.5rem + env(safe-area-inset-bottom, 0px));
  }

  .hero-brand {
    font-size: clamp(2.6rem, 17vw, 3.6rem);
    margin-bottom: 0.85rem;
  }

  .hero-brand .hero-kicker {
    letter-spacing: 0.14em;
    margin-bottom: 0.4rem;
  }

  .hero-lead {
    font-size: 1.02rem;
    margin-bottom: 1.35rem;
  }

  .cta-row {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-row .btn {
    width: 100%;
  }

  .section {
    width: min(100% - 1.5rem, var(--max));
    padding: 3.25rem 0;
  }

  .section-title {
    max-width: none;
    font-size: clamp(1.75rem, 8vw, 2.35rem);
  }

  .section-copy {
    margin-bottom: 1.75rem;
  }

  .route-facts {
    grid-template-columns: 1fr;
  }

  .feature-item {
    grid-template-columns: 2.25rem 1fr;
    gap: 0.75rem;
    padding: 1.2rem 0;
  }

  .feature-index {
    font-size: 0.95rem;
  }

  .feature-item h3 {
    font-size: 1.15rem;
  }

  .shot-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.55rem;
  }

  .shot-thumb {
    border-radius: 8px;
    min-height: 44px;
  }

  .protocol-chip {
    padding: 0.45rem 0.75rem;
    font-size: 0.84rem;
  }

  .support-split {
    grid-template-columns: 1fr;
  }

  .download-panel {
    padding: 1.25rem;
    border-radius: 18px;
    gap: 1.15rem;
  }

  .site-footer {
    padding:
      1.5rem
      calc(1rem + env(safe-area-inset-right, 0px))
      calc(2rem + env(safe-area-inset-bottom, 0px))
      calc(1rem + env(safe-area-inset-left, 0px));
  }

  .site-footer-inner {
    flex-direction: column;
    gap: 0.65rem;
  }
}

@media (max-width: 380px) {
  .shot-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav a {
    font-size: 0.86rem;
  }
}

@media (max-width: 900px) {
  .stats {
    width: min(100% - 2rem, var(--max));
  }
}

@media (max-width: 640px) {
  .stats {
    width: min(100% - 1.5rem, var(--max));
    grid-template-columns: repeat(2, 1fr);
    transform: none;
    border-radius: 16px;
  }

  .stat {
    padding: 1rem 0.95rem;
  }

  .stat:nth-child(3) {
    border-left: 0;
  }

  .stat:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .feature-item:hover {
    padding-left: 0;
    background: none;
  }
}

@media (hover: none) {
  .shot-main {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-orbit,
  .hero-img,
  .hero-word,
  .btn-primary::after,
  .protocol-chip,
  .protocol-chip::before,
  .download-panel::before {
    animation: none !important;
  }

  .ambient {
    display: none;
  }

  .shot-main {
    transform: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .shot-thumb:hover {
    transform: none;
  }

  .intro {
    transition: none;
  }
}