:root {
  --bg: #09121b;
  --bg-soft: #111f2c;
  --surface: #162a3b;
  --surface-2: #1f3448;
  --text: #f3f8fc;
  --muted: #9fbdcf;
  --brand: #5ef0c7;
  --brand-2: #ffad57;
  --line: rgba(255, 255, 255, 0.14);
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Noto Sans TC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 82% -10%, rgba(94, 240, 199, 0.25), transparent 38%),
    radial-gradient(circle at -8% 24%, rgba(255, 173, 87, 0.22), transparent 34%),
    var(--bg);
  line-height: 1.6;
}

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

.bg-orb {
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(58px);
  opacity: 0.3;
}

.orb-a {
  top: 18vh;
  right: -80px;
  width: 280px;
  height: 280px;
  background: #5ef0c7;
}

.orb-b {
  bottom: 12vh;
  left: -120px;
  width: 320px;
  height: 320px;
  background: #ffad57;
}

.bg-person-listener {
  position: fixed;
  z-index: -1;
  bottom: 10vh;
  right: -150px;
  width: 400px;
  height: 500px;
  opacity: 0.4;
  pointer-events: none;
}

.bg-person-listener svg {
  width: 100%;
  height: 100%;
}

.sound-wave {
  animation: pulse-wave 2s ease-in-out infinite;
  transform-origin: center;
}

.sound-wave-1 {
  animation-delay: 0s;
}

.sound-wave-2 {
  animation-delay: 0.3s;
}

.sound-wave-3 {
  animation-delay: 0.6s;
}

@keyframes pulse-wave {
  0%, 100% {
    r: 8px;
    opacity: 0.4;
  }
  50% {
    r: 18px;
    opacity: 0.1;
  }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px clamp(18px, 5vw, 56px);
  backdrop-filter: blur(8px);
  background: rgba(7, 14, 22, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.site-header.scrolled {
  border-color: var(--line);
}

.logo {
  font: 700 1.2rem/1 "Space Grotesk", sans-serif;
  letter-spacing: 0.04em;
}

.main-nav {
  display: flex;
  gap: 20px;
  color: var(--muted);
}

.main-nav a:hover,
.lang-link:hover,
.footer-links a:hover,
.text-link:hover {
  color: var(--brand);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.lang-link {
  color: var(--muted);
  font-weight: 500;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: linear-gradient(120deg, var(--brand), #56d3ff);
  color: #04232d;
  font-weight: 700;
  transition: transform 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}

main {
  padding: 30px clamp(18px, 5vw, 56px) 80px;
}

.hero {
  max-width: 920px;
  margin: 30px auto 80px;
  text-align: center;
}

.kicker {
  margin: 0;
  color: var(--brand-2);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Space Grotesk", "Noto Sans TC", sans-serif;
  line-height: 1.18;
}

h1 {
  margin-top: 14px;
  font-size: clamp(2.1rem, 5.6vw, 4rem);
}

.hero-copy {
  max-width: 700px;
  margin: 18px auto 0;
  color: var(--muted);
  font-size: 1.06rem;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.text-link {
  color: var(--muted);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
}

.stats {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stats li {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.stats strong {
  display: block;
  font: 700 1.6rem/1 "Space Grotesk", sans-serif;
}

.stats span {
  color: var(--muted);
  font-size: 0.92rem;
}

.section,
.download {
  max-width: 1120px;
  margin: 0 auto 74px;
}

.section-head {
  margin-bottom: 22px;
}

h2 {
  margin-top: 8px;
  font-size: clamp(1.58rem, 3.8vw, 2.4rem);
}

.card-grid {
  display: grid;
  gap: 12px;
}

.categories-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  padding: 14px;
  min-height: 74px;
  display: flex;
  align-items: center;
  font-weight: 600;
}

.split {
  display: grid;
  gap: 26px;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
}

.feature-list {
  margin: 18px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.mix-board {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  padding: 20px;
  box-shadow: var(--shadow);
}

.mix-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
}

.mix-row:last-child {
  margin-bottom: 0;
}

.mix-row span {
  font-size: 0.92rem;
  color: var(--muted);
}

.mix-row i {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  width: var(--level);
}

.three-cols {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card-detail {
  display: block;
  min-height: 190px;
}

.card-detail h3 {
  font-size: 1.1rem;
}

.card-detail p {
  margin: 12px 0 0;
  color: var(--muted);
}

.playlist-strip {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.playlist-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  padding: 18px;
  min-height: 170px;
}

.playlist-card p {
  margin: 10px 0 0;
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 10px;
}

details {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.03);
}

summary {
  cursor: pointer;
  font-weight: 700;
}

details p {
  margin: 10px 0 0;
  color: var(--muted);
}

.download {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 30px;
  background: linear-gradient(170deg, rgba(94, 240, 199, 0.1), rgba(255, 173, 87, 0.1));
  text-align: center;
}

.download p {
  margin: 12px auto 0;
  max-width: 620px;
  color: var(--muted);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 clamp(18px, 5vw, 56px) 34px;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 14px;
}

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .main-nav {
    display: none;
  }

  .categories-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split,
  .three-cols,
  .playlist-strip,
  .stats {
    grid-template-columns: 1fr;
  }

  .mix-row {
    grid-template-columns: 96px 1fr;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}