:root {
  --ink: #0b0a08;
  --ink-2: #12100d;
  --ink-3: #1a1712;
  --gold: #f0c21a;
  --gold-deep: #d4a60a;
  --gold-soft: rgba(240, 194, 26, 0.16);
  --lime: #d6ff3a;
  --paper: #f7f2e8;
  --muted: #b0a693;
  --line: rgba(246, 241, 230, 0.12);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.45);
  --shell: min(1180px, calc(100% - 2.5rem));
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Oswald", "Noto Sans SC", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-cn);
  color: var(--paper);
  background: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.ambient {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 480px at 12% 8%, rgba(240, 194, 26, 0.14), transparent 58%),
    radial-gradient(700px 420px at 88% 18%, rgba(214, 255, 58, 0.06), transparent 55%),
    radial-gradient(800px 500px at 60% 100%, rgba(240, 194, 26, 0.05), transparent 60%),
    linear-gradient(180deg, #100e0b 0%, var(--ink) 40%, #0a0907 100%);
}

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

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

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--gold);
  color: #111;
  padding: 0.6rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Masthead */
.mast {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(11, 10, 8, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.mast.is-solid {
  border-bottom-color: var(--line);
  background: rgba(11, 10, 8, 0.92);
}

.mast-row {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.mark img {
  border-radius: 10px;
  box-shadow: 0 0 0 1px rgba(240, 194, 26, 0.35);
}

.rail {
  margin-left: auto;
  display: flex;
  gap: 1.25rem;
  font-size: 0.94rem;
  color: var(--muted);
}

.rail a:hover {
  color: var(--gold);
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  background: var(--gold);
  color: #14110a;
  font-weight: 700;
  font-size: 0.92rem;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}

.pill:hover {
  background: #ffd84a;
  transform: translateY(-1px);
}

.burger {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: transparent;
  padding: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
}

.burger span {
  width: 18px;
  height: 2px;
  background: var(--paper);
  display: block;
}

.drawer {
  display: none;
  flex-direction: column;
  gap: 0.85rem;
  padding: 0.5rem 1.25rem 1.25rem;
  border-top: 1px solid var(--line);
  background: rgba(11, 10, 8, 0.96);
}

.drawer:not([hidden]) {
  display: flex;
}

.drawer a {
  color: var(--muted);
}

.drawer .pill {
  width: fit-content;
  color: #14110a;
}

/* Hero: left stage + right copy, no bg image */
.hero {
  position: relative;
  min-height: auto;
  display: grid;
  align-items: center;
  padding: 3.25rem 0 2.25rem;
  overflow: visible;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: stretch;
}

.hero-stage {
  position: relative;
  left: 20px;
  height: auto;
  min-height: 100%;
  align-self: stretch;
  perspective: 1200px;
}

.glow-blob {
  position: absolute;
  inset: 12% 18% 18% 12%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 40% 40%, rgba(240, 194, 26, 0.45), transparent 55%),
    radial-gradient(circle at 70% 60%, rgba(214, 255, 58, 0.18), transparent 50%);
  filter: blur(18px);
  animation: blob-pulse 5s ease-in-out infinite;
}

.orbit {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(240, 194, 26, 0.22);
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.orbit-a {
  width: 88%;
  height: 88%;
  animation: spin 22s linear infinite;
  border-style: dashed;
}

.orbit-b {
  width: 68%;
  height: 68%;
  border-color: rgba(214, 255, 58, 0.16);
  animation: spin 16s linear infinite reverse;
}

.orbit::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 16px rgba(240, 194, 26, 0.8);
  top: 8%;
  left: 50%;
}

.phone {
  position: absolute;
  border-radius: 28px;
  overflow: hidden;
  background: #111;
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow:
    0 30px 70px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(240, 194, 26, 0.08),
    inset 0 0 0 1px rgba(255, 255, 255, 0.04);
  transform-style: preserve-3d;
  will-change: transform, translate;
  transition: translate 0.25s var(--ease);
}

.phone img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.phone-main {
  width: auto;
  height: 100%;
  aspect-ratio: 9 / 17.5;
  left: 30%;
  top: 0;
  bottom: 0;
  z-index: 3;
  animation: float-main 5.5s ease-in-out infinite;
  transform: rotateY(-8deg) rotateX(4deg) rotateZ(-2deg);
}

.phone-back {
  width: auto;
  height: 78%;
  aspect-ratio: 9 / 16;
  left: 0;
  top: 0;
  z-index: 2;
  opacity: 0.95;
  animation: float-back 6.2s ease-in-out infinite;
  transform: rotateY(18deg) rotateZ(-8deg) scale(0.96);
  filter: saturate(1.05);
}

.phone-side {
  width: auto;
  height: 74%;
  aspect-ratio: 9 / 16;
  right: 0;
  bottom: 0;
  top: auto;
  z-index: 4;
  animation: float-side 4.8s ease-in-out infinite;
  transform: rotateY(-16deg) rotateZ(7deg) scale(0.92);
  box-shadow:
    0 24px 50px rgba(0, 0, 0, 0.5),
    0 0 40px rgba(240, 194, 26, 0.12);
}

.spark {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 18px rgba(214, 255, 58, 0.85);
  z-index: 5;
  animation: spark 3.4s ease-in-out infinite;
}

.spark.s1 { left: 18%; top: 14%; }
.spark.s2 { right: 16%; top: 28%; animation-delay: 0.8s; background: var(--gold); }
.spark.s3 { left: 42%; bottom: 12%; animation-delay: 1.4s; }

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero-kicker {
  margin: 0 0 0.85rem;
  color: var(--gold);
  font-weight: 700;
  letter-spacing: 0.16em;
  font-size: 0.84rem;
}

.hero-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4.8rem, 11vw, 8.2rem);
  line-height: 0.92;
  letter-spacing: 0.06em;
  background: linear-gradient(180deg, #fff8df 10%, var(--gold) 55%, #c99608 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 14px 40px rgba(0, 0, 0, 0.45));
}

.hero-tag {
  margin: 1rem 0 0;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: 700;
  color: rgba(246, 241, 230, 0.95);
  letter-spacing: 0.04em;
}

.hero-lead {
  margin: 1.1rem 0 0;
  max-width: 36rem;
  font-size: 1.02rem;
  color: rgba(246, 241, 230, 0.82);
}

.hero-points {
  margin-top: 1.35rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.hero-points span {
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(240, 194, 26, 0.28);
  background: rgba(240, 194, 26, 0.08);
  color: #f3e7b8;
  font-size: 0.86rem;
  font-weight: 600;
}

.hero-actions {
  margin-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  align-items: center;
}

.hero-note {
  margin: 1.1rem 0 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.cta-gold {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  padding: 1rem 1.45rem;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--gold) 0%, #ffe36a 48%, var(--gold-deep) 100%);
  color: #15120a;
  box-shadow: 0 16px 40px rgba(240, 194, 26, 0.28);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  animation: cta-glow 3.2s ease-in-out infinite;
}

.cta-gold span {
  font-weight: 900;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.cta-gold small {
  font-size: 0.78rem;
  opacity: 0.75;
}

.cta-gold:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 50px rgba(240, 194, 26, 0.38);
}

.cta-gold.large {
  padding: 1.2rem 1.8rem;
}

.cta-ghost {
  padding: 1rem 1.2rem;
  border-radius: 16px;
  border: 1px solid rgba(246, 241, 230, 0.28);
  color: var(--paper);
  font-weight: 600;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.cta-ghost:hover {
  border-color: var(--gold);
  background: var(--gold-soft);
}

/* Sections */
.band {
  padding: 5.25rem 0;
  position: relative;
}

.band-alt {
  background:
    linear-gradient(180deg, rgba(240, 194, 26, 0.035), transparent 28%),
    var(--ink-2);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.about-item {
  padding: 1.45rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    linear-gradient(160deg, rgba(240, 194, 26, 0.07), transparent 45%),
    rgba(255, 255, 255, 0.02);
}

.about-item h3 {
  margin: 0 0 0.65rem;
  font-size: 1.2rem;
}

.about-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.2rem;
  align-items: center;
}

.split.reverse {
  grid-template-columns: 0.9fr 1.1fr;
}

.split.reverse .split-copy {
  order: 2;
}

.split-copy h2 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: 0.02em;
}

.split-copy > p {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 38rem;
}

.ticks {
  margin: 1.35rem 0 1.6rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.ticks li {
  position: relative;
  padding-left: 1.5rem;
  color: rgba(246, 241, 230, 0.92);
}

.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(214, 255, 58, 0.12);
}

.text-link {
  color: var(--gold);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.text-link:hover {
  color: #ffe36a;
}

.split-shot {
  margin: 0 auto;
  width: min(327px, 100%);
  border-radius: 22px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  background: var(--ink-3);
}

.split-shot img {
  width: 100%;
  height: auto;
  object-fit: contain;
  image-rendering: auto;
}

.shot-duo {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 1rem;
  margin: 0 auto;
}

.shot-phone {
  margin: 0;
  width: 270px;
  max-width: calc(50% - 0.5rem);
  border-radius: 18px;
  overflow: hidden;
  background: var(--ink-3);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.shot-phone-tilt {
  transform: translateY(-12px);
}

.shot-phone img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

.shot-phone figcaption {
  padding: 0.7rem 0.85rem 0.85rem;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
}

.sec-head {
  margin-bottom: 2.4rem;
  max-width: 42rem;
}

.sec-head h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 4vw, 2.7rem);
  line-height: 1.15;
}

.sec-head p {
  margin: 0;
  color: var(--muted);
}

.filmstrip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.frame {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-3);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease);
}

.frame:hover {
  transform: translateY(-6px);
  border-color: rgba(240, 194, 26, 0.45);
}

.frame img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
}

.frame figcaption {
  padding: 0.9rem 1rem 1.05rem;
  border-top: 1px solid var(--line);
}

.frame figcaption strong {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.frame figcaption span {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.5;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  counter-reset: none;
}

.steps li {
  padding: 1.4rem 1.3rem;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.steps strong {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--gold);
  font-size: 1.05rem;
}

.steps p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.trust {
  padding: 1.8rem 0;
  border-block: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(240, 194, 26, 0.07), transparent 42%, rgba(214, 255, 58, 0.04));
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.trust-item {
  padding: 1rem 0.5rem;
  text-align: center;
}

.trust-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.55rem);
  color: var(--gold);
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.trust-item span {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.download-band {
  padding: 5rem 0;
  background:
    radial-gradient(700px 240px at 50% 100%, rgba(240, 194, 26, 0.2), transparent 70%),
    var(--ink);
}

.download-inner {
  text-align: center;
  max-width: 700px;
}

.download-inner h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(2.1rem, 4.5vw, 3rem);
}

.download-inner p {
  margin: 0 0 1.75rem;
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 0.85rem;
  max-width: 860px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.02);
  padding: 0.35rem 1.15rem;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 0.95rem 0;
  font-weight: 700;
  font-size: 1.05rem;
}

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

.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--gold);
  font-weight: 500;
}

.faq-item[open] summary::after {
  content: "–";
}

.faq-item p {
  margin: 0 0 1.05rem;
  color: var(--muted);
  line-height: 1.75;
}

.voices {
  background: var(--ink-2);
}

.voice-list {
  display: grid;
  gap: 1rem;
}

.voice {
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.03), transparent 55%);
}

.voice-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1rem;
  align-items: baseline;
  margin-bottom: 0.55rem;
}

.voice-name {
  font-weight: 700;
  color: var(--gold);
}

.voice time {
  color: var(--muted);
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
}

.voice p {
  margin: 0;
  color: rgba(246, 241, 230, 0.9);
  line-height: 1.75;
}

.foot {
  padding: 2.5rem 0 2rem;
  border-top: 1px solid var(--line);
  background: #080706;
}

.foot-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.foot-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.foot-brand img {
  border-radius: 9px;
}

.foot-brand strong {
  display: block;
  font-size: 1.05rem;
}

.foot-brand p {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.foot-note {
  color: var(--muted);
  font-size: 0.82rem;
}

.foot-note p {
  margin: 0;
}

/* Motion */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@keyframes float-main {
  0%, 100% { transform: rotateY(-8deg) rotateX(4deg) rotateZ(-2deg) translateY(0); }
  50% { transform: rotateY(-6deg) rotateX(2deg) rotateZ(-1deg) translateY(-6px); }
}

@keyframes float-back {
  0%, 100% { transform: rotateY(18deg) rotateZ(-8deg) scale(0.96) translateY(0); }
  50% { transform: rotateY(16deg) rotateZ(-7deg) scale(0.96) translateY(5px); }
}

@keyframes float-side {
  0%, 100% { transform: rotateY(-16deg) rotateZ(7deg) scale(0.92) translateY(0); }
  50% { transform: rotateY(-14deg) rotateZ(6deg) scale(0.92) translateY(-5px); }
}

@keyframes spin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes blob-pulse {
  0%, 100% { opacity: 0.75; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.06); }
}

@keyframes spark {
  0%, 100% { opacity: 0.35; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.25); }
}

@keyframes cta-glow {
  0%, 100% { box-shadow: 0 16px 40px rgba(240, 194, 26, 0.28); }
  50% { box-shadow: 0 18px 48px rgba(240, 194, 26, 0.42); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .phone,
  .orbit,
  .glow-blob,
  .spark,
  .cta-gold {
    animation: none;
  }
}

/* Responsive */
@media (max-width: 1040px) {
  .rail {
    display: none;
  }

  .mast-row .pill {
    display: none;
  }

  .burger {
    display: inline-flex;
    margin-left: auto;
  }

  .hero {
    padding: 2.75rem 0 1.75rem;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.2rem;
  }

  .hero-stage {
    left: 0;
    width: 100%;
    max-width: 520px;
    height: 420px;
    min-height: 420px;
    margin-inline: auto;
  }

  .shot-duo {
    order: -1;
  }

  .phone-main {
    left: 28%;
    height: 96%;
    top: 2%;
  }

  .split,
  .split.reverse {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .split.reverse .split-copy {
    order: 0;
  }

  .about-grid,
  .filmstrip,
  .steps {
    grid-template-columns: 1fr 1fr;
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  :root {
    --shell: min(1180px, calc(100% - 1.5rem));
  }

  .hero-title {
    font-size: clamp(4.2rem, 20vw, 5.4rem);
  }

  .hero-stage {
    height: 380px;
    min-height: 380px;
  }

  .phone-main {
    left: 26%;
  }

  .phone-back {
    height: 72%;
  }

  .phone-side {
    height: 68%;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-ghost {
    text-align: center;
  }

  .about-grid,
  .filmstrip,
  .steps {
    grid-template-columns: 1fr;
  }

  .filmstrip {
    grid-template-columns: 1fr 1fr;
  }

  .frame figcaption span {
    display: none;
  }

  .foot-row {
    flex-direction: column;
    align-items: flex-start;
  }
}