:root {
  --ink: #071b2b;
  --ink-soft: #15364a;
  --paper: #f7f3ea;
  --paper-deep: #efe8dc;
  --white: #fffdf8;
  --teal: #0f8b8d;
  --teal-bright: #61d4c2;
  --coral: #ff7a66;
  --sand: #f4e9d8;
  --line: rgba(7, 27, 43, 0.13);
  --muted: #5b6e79;
  --shadow: 0 22px 56px rgba(7, 27, 43, 0.13);
  --nav-ink: #363151;
  --nav-violet: #7665d9;
  --nav-pink: #f28fb6;
  --nav-blue: #88c9ea;
  --nav-lilac: #f2edff;
  --radius-lg: 30px;
  --radius-md: 20px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 3%, rgba(97, 212, 194, 0.18), transparent 28rem),
    var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(rgba(7, 27, 43, 0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(7, 27, 43, 0.025) 1px, transparent 1px);
  background-size: 42px 42px;
  content: "";
  pointer-events: none;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 4px;
}

p,
h1,
h2,
h3 {
  margin-top: 0;
}

p:last-child {
  margin-bottom: 0;
}

.container {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 16px;
  color: white;
  background: var(--ink);
  border-radius: 999px;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  background:
    radial-gradient(circle at 8% 24%, rgba(242, 143, 182, 0.2), transparent 12rem),
    radial-gradient(circle at 88% 0%, rgba(136, 201, 234, 0.24), transparent 16rem),
    rgba(255, 251, 255, 0.94);
  border-bottom: 1px solid rgba(118, 101, 217, 0.16);
  transition: background 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
  backdrop-filter: blur(18px);
}

.site-header::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 5%, var(--nav-pink), var(--nav-violet), var(--nav-blue), transparent 95%);
  content: "";
  opacity: 0.58;
  pointer-events: none;
}

.site-header.is-scrolled {
  background: rgba(255, 251, 255, 0.92);
  border-color: rgba(118, 101, 217, 0.2);
  box-shadow: 0 12px 36px rgba(67, 50, 112, 0.11);
}

.nav-shell {
  position: relative;
  width: min(calc(100% - 40px), var(--max));
  min-height: 92px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 30px;
  margin-inline: auto;
  padding: 14px 0;
}

.brand {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--nav-ink);
  font-size: 20px;
  font-weight: 850;
  letter-spacing: -0.04em;
  white-space: nowrap;
}

.brand::after {
  padding: 3px 8px;
  color: var(--nav-violet);
  background: rgba(242, 237, 255, 0.88);
  border: 1px solid rgba(118, 101, 217, 0.16);
  border-radius: 999px;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.12em;
  content: "VOICE ROMANCE";
}

.brand-mark {
  position: relative;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  overflow: hidden;
  background: linear-gradient(145deg, var(--nav-violet), #4d3e9f 58%, var(--nav-pink));
  border: 2px solid rgba(255, 255, 255, 0.86);
  border-radius: 15px 50% 50%;
  box-shadow: 0 8px 20px rgba(118, 101, 217, 0.24);
  transform: rotate(-5deg);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  left: -7px;
  width: 54px;
  height: 26px;
  border: 4px solid white;
  border-color: white transparent transparent;
  border-radius: 50%;
  content: "";
  transform: rotate(-9deg);
}

.brand-mark::before {
  top: 16px;
}

.brand-mark::after {
  top: 23px;
  border-top-color: #ffc4dd;
}

.site-nav {
  position: static;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  padding: 0;
  color: var(--ink);
  counter-reset: channel;
}

.site-nav::before {
  display: none;
}

.site-nav a {
  position: relative;
  overflow: hidden;
  min-height: 50px;
  display: grid;
  grid-template-columns: 22px 1fr;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  color: var(--nav-ink);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(242, 237, 255, 0.86));
  border: 1px solid rgba(118, 101, 217, 0.2);
  border-radius: 18px 18px 18px 6px;
  box-shadow: 0 5px 14px rgba(67, 50, 112, 0.06), inset 0 1px 0 white;
  font-size: 13px;
  font-weight: 800;
  counter-increment: channel;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.site-nav a:nth-child(even) {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(233, 247, 255, 0.88));
}

.site-nav a::before {
  color: var(--nav-violet);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
  content: counter(channel, decimal-leading-zero);
}

.site-nav a::after {
  position: absolute;
  top: 4px;
  right: 7px;
  color: var(--nav-pink);
  font-size: 9px;
  content: "✦";
  opacity: 0.58;
}

.site-nav a:hover,
.site-nav a.is-active {
  border-color: rgba(118, 101, 217, 0.42);
  box-shadow: 0 9px 22px rgba(118, 101, 217, 0.16);
  transform: translateY(-2px);
}

.site-nav a.is-active {
  color: white;
  background: linear-gradient(135deg, #6956cd, #a269de 52%, #ee8eb9);
  border-color: transparent;
  box-shadow: 0 11px 25px rgba(118, 101, 217, 0.28);
}

.site-nav a.is-active::before,
.site-nav a.is-active::after {
  color: white;
}

.btn {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 800;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

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

.btn-primary {
  color: var(--white);
  background: var(--ink);
  box-shadow: 0 13px 30px rgba(7, 27, 43, 0.24);
}

.btn-primary:hover {
  background: var(--teal);
}

.btn-secondary {
  color: var(--ink);
  background: rgba(255, 253, 248, 0.74);
  border-color: var(--line);
}

.btn-secondary:hover {
  background: var(--white);
}

.btn-coral {
  color: var(--ink);
  background: var(--coral);
  box-shadow: 0 13px 30px rgba(255, 122, 102, 0.25);
}

.hero {
  position: relative;
  min-height: 720px;
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: 72px 0 100px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.98fr);
  align-items: center;
  gap: 64px;
}

.eyebrow {
  margin-bottom: 18px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1,
.subpage-hero h1 {
  max-width: 780px;
  margin-bottom: 24px;
  font-size: clamp(46px, 7vw, 86px);
  line-height: 1.04;
  letter-spacing: -0.065em;
}

.hero h1 span {
  color: var(--teal);
}

.hero-lead,
.subpage-lead {
  max-width: 680px;
  color: var(--ink-soft);
  font-size: clamp(18px, 2vw, 22px);
}

.hero-actions,
.page-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.trust-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 26px;
  color: var(--muted);
  font-size: 14px;
}

.trust-line span::before {
  margin-right: 8px;
  color: var(--teal);
  content: "●";
}

.tide-stage {
  position: relative;
  min-height: 560px;
  overflow: hidden;
  background:
    radial-gradient(circle at 66% 28%, rgba(97, 212, 194, 0.32), transparent 26%),
    linear-gradient(145deg, #0c2f42, #071b2b 62%);
  border-radius: 42% 42% 28% 32% / 24% 28% 36% 44%;
  box-shadow: var(--shadow);
}

.tide-stage::before,
.tide-stage::after {
  position: absolute;
  width: 130%;
  height: 62%;
  left: -15%;
  border: 3px solid rgba(97, 212, 194, 0.85);
  border-color: rgba(97, 212, 194, 0.9) transparent transparent;
  border-radius: 50%;
  content: "";
}

.tide-stage::before {
  bottom: -10%;
  transform: rotate(-9deg);
  box-shadow: 0 -13px 0 rgba(15, 139, 141, 0.42), 0 -26px 0 rgba(97, 212, 194, 0.2);
}

.tide-stage::after {
  bottom: 4%;
  border-top-color: var(--coral);
  transform: rotate(8deg);
}

.audio-orbit {
  position: absolute;
  top: 15%;
  left: 13%;
  width: 74%;
  aspect-ratio: 1;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 50%;
}

.audio-orbit::before {
  position: absolute;
  inset: 18%;
  background: repeating-conic-gradient(from 0deg, var(--coral) 0 1deg, transparent 1deg 7deg);
  border-radius: 50%;
  content: "";
  mask: radial-gradient(circle, transparent 55%, #000 56% 62%, transparent 63%);
}

.audio-orbit::after {
  position: absolute;
  inset: 36%;
  background: var(--teal-bright);
  border-radius: 50%;
  box-shadow: 0 0 50px rgba(97, 212, 194, 0.45);
  content: "";
}

.now-listening {
  position: absolute;
  right: 7%;
  bottom: 12%;
  left: 7%;
  z-index: 2;
  display: grid;
  grid-template-columns: 52px 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 18px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 20px;
  backdrop-filter: blur(16px);
}

.play-dot {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: var(--coral);
  border-radius: 50%;
  font-weight: 900;
}

.now-listening small,
.now-listening strong {
  display: block;
}

.now-listening small {
  color: rgba(255, 255, 255, 0.66);
}

.section {
  padding: 102px 0;
}

.section-dark {
  color: var(--white);
  background: var(--ink);
}

.section-dark .eyebrow {
  color: var(--teal-bright);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 42px;
}

.section-heading h2 {
  margin-bottom: 15px;
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.05em;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  font-size: 18px;
}

.section-dark .section-heading p:not(.eyebrow) {
  color: rgba(255, 255, 255, 0.68);
}

.value-grid,
.content-grid,
.route-grid,
.topic-grid,
.legal-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.value-card,
.content-card,
.route-card,
.topic-card,
.legal-card,
.step-card {
  position: relative;
  padding: 28px;
  background: rgba(255, 253, 248, 0.78);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.value-card {
  min-height: 250px;
}

.value-card .number,
.route-card .number,
.step-card .number {
  margin-bottom: 42px;
  color: var(--coral);
  font-weight: 900;
  letter-spacing: 0.12em;
}

.value-card h3,
.content-card h2,
.content-card h3,
.route-card h2,
.route-card h3,
.topic-card h2,
.topic-card h3,
.legal-card h2,
.step-card h2,
.step-card h3 {
  margin-bottom: 10px;
  font-size: 22px;
  line-height: 1.28;
  letter-spacing: -0.025em;
}

.value-card p,
.content-card p,
.route-card p,
.topic-card p,
.legal-card p,
.step-card p {
  color: var(--muted);
}

.section-dark .value-card {
  background: rgba(255, 255, 255, 0.055);
  border-color: rgba(255, 255, 255, 0.12);
}

.section-dark .value-card p {
  color: rgba(255, 255, 255, 0.65);
}

.topic-card {
  overflow: hidden;
  min-height: 290px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: var(--white);
  background: var(--ink-soft);
  border: 0;
}

.topic-card::before {
  position: absolute;
  top: -36%;
  right: -24%;
  width: 220px;
  height: 220px;
  border: 2px solid var(--teal-bright);
  border-radius: 50%;
  box-shadow: 0 14px 0 rgba(97, 212, 194, 0.22), 0 28px 0 rgba(255, 122, 102, 0.15);
  content: "";
}

.topic-card:nth-child(2) {
  background: var(--teal);
}

.topic-card:nth-child(3) {
  color: var(--ink);
  background: var(--coral);
}

.topic-card p {
  position: relative;
  z-index: 1;
  color: inherit;
  opacity: 0.78;
}

.topic-card h3 {
  position: relative;
  z-index: 1;
  font-size: 30px;
}

.seo-refresh {
  background: var(--paper-deep);
}

.row-heading {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
}

.row-heading > div {
  max-width: 760px;
}

.row-heading time {
  padding: 8px 13px;
  color: var(--teal);
  background: rgba(15, 139, 141, 0.11);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
}

.seo-refresh-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.seo-refresh-card {
  padding: 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.seo-refresh-card span,
.tag {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 5px 10px;
  color: var(--teal);
  background: rgba(15, 139, 141, 0.11);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
}

.seo-refresh-card h3 {
  margin-bottom: 8px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-cloud .tag {
  margin: 0;
  padding: 8px 13px;
  font-size: 14px;
}

.seo-refresh-card p {
  color: var(--muted);
}

.cta-panel {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 36px;
  padding: 52px;
  color: var(--white);
  background: var(--teal);
  border-radius: var(--radius-lg);
}

.cta-panel::after {
  position: absolute;
  right: -40px;
  bottom: -90px;
  width: 260px;
  height: 260px;
  border: 3px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  content: "";
}

.cta-panel h2 {
  margin-bottom: 10px;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.16;
  letter-spacing: -0.045em;
}

.cta-panel p {
  color: rgba(255, 255, 255, 0.76);
}

.subpage-hero {
  padding: 92px 0 72px;
}

.subpage-hero h1 {
  max-width: 920px;
  font-size: clamp(44px, 7vw, 78px);
}

.subpage-shell {
  padding: 20px 0 100px;
}

.subpage-section {
  margin-bottom: 64px;
}

.subpage-section > h2 {
  margin-bottom: 20px;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: -0.04em;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.notice {
  margin: 28px 0;
  padding: 20px 22px;
  color: var(--ink-soft);
  background: rgba(255, 122, 102, 0.1);
  border-left: 4px solid var(--coral);
  border-radius: 0 14px 14px 0;
}

.notice strong {
  color: var(--ink);
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  padding: 20px 22px;
  background: rgba(255, 253, 248, 0.84);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.faq-list summary {
  padding-right: 24px;
  font-weight: 850;
  cursor: pointer;
}

.faq-list details p {
  margin-top: 12px;
  color: var(--muted);
}

.prose {
  max-width: 820px;
}

.prose h2 {
  margin-top: 44px;
  margin-bottom: 14px;
  font-size: 28px;
}

.prose h3 {
  margin-top: 28px;
}

.prose p,
.prose li {
  color: var(--ink-soft);
}

.prose li + li {
  margin-top: 8px;
}

.site-footer {
  padding: 64px 0 34px;
  color: rgba(255, 255, 255, 0.72);
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr repeat(2, 0.7fr);
  gap: 42px;
  padding-bottom: 42px;
}

.footer-brand {
  max-width: 420px;
}

.footer-brand .brand {
  color: white;
}

.footer-brand p {
  margin-top: 18px;
}

.footer-links strong {
  display: block;
  margin-bottom: 14px;
  color: var(--white);
}

.footer-links a {
  min-height: 36px;
  display: block;
}

.footer-links a:hover {
  color: var(--teal-bright);
}

.footer-bottom {
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 13px;
}

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 40;
  width: 48px;
  height: 48px;
  color: white;
  background: var(--ink);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 160ms ease, transform 160ms ease;
  cursor: pointer;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 1180px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .tide-stage {
    min-height: 480px;
  }

  .hero {
    min-height: auto;
  }

  .value-grid,
  .content-grid,
  .route-grid,
  .topic-grid,
  .legal-grid,
  .seo-refresh-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1040px) and (min-width: 861px) {
  .nav-shell {
    gap: 20px;
  }

  .brand::after {
    display: none;
  }

  .site-nav {
    gap: 5px;
  }

  .site-nav a {
    padding-inline: 8px;
  }
}

@media (max-width: 860px) {
  .site-header {
    background:
      radial-gradient(circle at 6% 12%, rgba(242, 143, 182, 0.2), transparent 10rem),
      radial-gradient(circle at 94% 0%, rgba(136, 201, 234, 0.22), transparent 12rem),
      rgba(255, 251, 255, 0.95);
    box-shadow: 0 8px 24px rgba(67, 50, 112, 0.07);
  }

  .site-header.is-scrolled {
    box-shadow: 0 8px 24px rgba(67, 50, 112, 0.11);
  }

  .nav-shell {
    width: min(calc(100% - 40px), var(--max));
    height: auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    padding-block: 12px;
  }

  .brand::after {
    display: none;
  }

  .site-nav {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    padding: 0;
  }

  .site-nav::before {
    display: none;
  }

  .site-nav a {
    min-height: 42px;
    display: flex;
    justify-content: center;
    padding: 0 6px;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(242, 237, 255, 0.9));
    border-color: rgba(118, 101, 217, 0.2);
    border-radius: 15px 15px 15px 5px;
    font-size: 13px;
  }

  .site-nav a::before {
    display: none;
  }

  .site-nav a.is-active {
    color: white;
    background: linear-gradient(135deg, #6956cd, #a269de 52%, #ee8eb9);
    border-color: transparent;
  }

  .cta-panel {
    grid-template-columns: 1fr;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 28px), var(--max));
  }

  .nav-shell {
    width: min(calc(100% - 28px), var(--max));
    min-height: 0;
  }

  .site-nav a {
    min-height: 40px;
    font-size: 12px;
  }

  .hero {
    padding: 44px 0 72px;
  }

  .hero-grid {
    gap: 42px;
  }

  .hero h1,
  .subpage-hero h1 {
    font-size: clamp(42px, 14vw, 62px);
  }

  .hero-actions .btn,
  .page-actions .btn {
    width: 100%;
  }

  .tide-stage {
    min-height: 420px;
    border-radius: 30px;
  }

  .now-listening {
    grid-template-columns: 46px 1fr;
  }

  .now-listening > strong:last-child {
    display: none;
  }

  .play-dot {
    width: 46px;
    height: 46px;
  }

  .section {
    padding: 76px 0;
  }

  .value-grid,
  .content-grid,
  .route-grid,
  .topic-grid,
  .legal-grid,
  .seo-refresh-grid,
  .step-grid {
    grid-template-columns: 1fr;
  }

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

  .cta-panel {
    padding: 32px 24px;
  }

  .subpage-hero {
    padding: 62px 0 48px;
  }

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

  .footer-brand {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}