:root {
  --ink: #22252a;
  --muted: #626a73;
  --line: #dde3ea;
  --card: #ffffff;
  --paper: #f6f7f9;
  --accent: #2f5f6f;
  --accent-dark: #214757;
  --orange: #e76f3c;
  --green: #09bd65;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, #ffffff 0%, var(--paper) 100%);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(16px, 5vw, 48px);
  background: rgba(255, 255, 255, 0.93);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 190px;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.logo {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 800;
}

.main-nav {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

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

.hero {
  min-height: 480px;
  display: grid;
  place-items: center;
  padding: 52px 16px;
  background:
    linear-gradient(rgba(247, 250, 252, 0.28), rgba(247, 250, 252, 0.92)),
    url("https://obs.jd66music.cn/homepage/banner-bg.jpg") center/cover no-repeat;
}

.hero-inner {
  width: min(720px, 100%);
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 20px 42px rgba(21, 45, 58, 0.12);
  text-align: center;
}

.eyebrow,
.bundle-kicker {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
}

h1,
h2 {
  margin: 0;
  line-height: 1.25;
}

h1 {
  font-size: clamp(30px, 7vw, 54px);
}

h2 {
  font-size: 22px;
}

.hero-copy {
  max-width: 620px;
  margin: 14px auto 0;
  color: var(--muted);
}

.container {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 0;
}

.card,
.notice-card,
.payment-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  box-shadow: 0 8px 24px rgba(35, 50, 64, 0.06);
}

.card,
.notice-card {
  padding: clamp(18px, 4vw, 28px);
}

.notice-card {
  border-left: 5px solid var(--accent);
}

.notice-card ul {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.notice-card li {
  padding: 7px 0 7px 24px;
  position: relative;
}

.notice-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.contact,
.warning {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #fff7e7;
  color: #7a5200;
  font-weight: 700;
}

.tags,
.feature-grid,
.pay-tips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tags {
  justify-content: center;
  margin-top: 16px;
}

.tags span,
.feature-grid span,
.pay-tips span {
  border-radius: 999px;
  background: #eef3f5;
  color: #314d58;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
}

.primary-btn,
.buy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 800;
  box-shadow: 0 8px 0 rgba(31, 72, 88, 0.2);
}

.primary-btn {
  margin-top: 22px;
}

.buy-btn {
  width: 100%;
  margin-top: 18px;
  background: var(--orange);
  box-shadow: 0 8px 0 rgba(160, 76, 37, 0.2);
}

.primary-btn:hover,
.buy-btn:hover {
  transform: translateY(-1px);
}

.showcase {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 320px);
  gap: 24px;
  align-items: center;
}

.showcase p,
.bundle p,
.faq p {
  color: var(--muted);
}

.feature-grid {
  margin-top: 16px;
}

.bundle-section {
  display: grid;
  gap: 24px;
}

.bundle-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.price {
  flex: 0 0 auto;
  border-radius: 999px;
  padding: 7px 12px;
  background: #fff0e9;
  color: #c15023;
  font-size: 20px;
}

.song-list-box {
  margin-top: 16px;
}

.list-toggle {
  width: 100%;
  min-height: 44px;
  border: 1px solid rgba(47, 95, 111, 0.24);
  border-radius: 8px;
  background: #ffffff;
  color: var(--accent);
  font-weight: 800;
  cursor: pointer;
}

.song-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 16px;
  margin: 14px 0 0;
  padding: 0 0 0 24px;
}

.song-list.is-collapsed {
  display: none;
}

.song-list li {
  border-bottom: 1px solid #edf0f3;
  padding: 5px 0;
}

.score-img,
.image-pair img,
.showcase img {
  border: 1px solid var(--line);
  border-radius: 8px;
}

.score-img {
  width: min(620px, 100%);
  margin: 18px auto 0;
}

.image-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.fine-print {
  margin: 8px 0 0;
  text-align: center;
  font-size: 13px;
}

.payment-card {
  display: grid;
  grid-template-columns: 1fr minmax(260px, 360px);
  gap: 22px;
  align-items: center;
  padding: clamp(18px, 4vw, 28px);
  background:
    linear-gradient(135deg, rgba(9, 189, 101, 0.1), rgba(47, 95, 111, 0.08)),
    #ffffff;
}

.payment-card figure {
  margin: 0;
  text-align: center;
}

.payment-card figure img {
  width: min(320px, 100%);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.payment-card figcaption {
  margin-top: 10px;
  color: var(--green);
  font-size: 20px;
  font-weight: 800;
}

.pay-tips {
  margin-top: 14px;
}

.faq details {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

.faq details:first-of-type {
  margin-top: 10px;
}

.faq summary {
  cursor: pointer;
  font-weight: 800;
}

.site-footer {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 44px;
  color: var(--muted);
  text-align: center;
}

.site-footer strong {
  display: block;
  color: var(--ink);
  font-size: 18px;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
  }

  .main-nav {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 34px;
  }

  .hero-inner {
    padding: 22px 16px;
  }

  .showcase,
  .payment-card,
  .image-pair {
    grid-template-columns: 1fr;
  }

  .song-list {
    grid-template-columns: 1fr;
  }

  .bundle-head {
    display: block;
  }

  .price {
    display: inline-block;
    margin-top: 12px;
  }
}