:root {
  --bg: #eef4ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --line: rgba(36, 72, 140, 0.1);
  --text: #0f172a;
  --muted: #5b6b88;
  --brand: #3159ff;
  --brand-2: #4db6ff;
  --brand-3: #7a67ff;
  --success: #0f9f6e;
  --shadow: 0 24px 80px rgba(44, 73, 156, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(77, 182, 255, 0.24), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(122, 103, 255, 0.18), transparent 24%),
    linear-gradient(180deg, #f7fbff 0%, var(--bg) 100%);
}

.site-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px;
}

.hero,
.scan-section,
.feature-section,
.scenario-section,
.free-tools-section,
.trial-section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero {
  padding: 28px 28px 36px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 28px;
}

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

.brand-mark {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-2) 100%);
  box-shadow: 0 12px 28px rgba(49, 89, 255, 0.24);
}

.brand-copy {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-sub {
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.domain-pill {
  text-decoration: none;
  color: var(--brand);
  background: rgba(49, 89, 255, 0.08);
  border: 1px solid rgba(49, 89, 255, 0.16);
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 600;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}

.eyebrow,
.section-kicker {
  color: var(--brand);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 13px;
}

.hero-copy h1 {
  margin: 16px 0 18px;
  font-size: clamp(40px, 6vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.hero-desc,
.scan-copy p,
.trial-card li,
.scenario-column li,
.tool-card p,
.feature-card p {
  color: var(--muted);
  line-height: 1.8;
  font-size: 16px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.primary-btn,
.secondary-btn,
.footer a {
  text-decoration: none;
  border-radius: 999px;
  padding: 15px 22px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.primary-btn {
  color: #fff;
  background: linear-gradient(135deg, var(--brand-3) 0%, var(--brand) 100%);
  box-shadow: 0 16px 28px rgba(64, 84, 255, 0.24);
}

.secondary-btn {
  color: var(--brand);
  background: rgba(49, 89, 255, 0.08);
  border: 1px solid rgba(49, 89, 255, 0.14);
}

.primary-btn:hover,
.secondary-btn:hover,
.footer a:hover {
  transform: translateY(-2px);
}

.hero-points {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 10px;
}

.hero-points li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 500;
}

.hero-points li::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-2) 100%);
  box-shadow: 0 0 0 6px rgba(49, 89, 255, 0.08);
}

.hero-visual {
  position: relative;
  min-height: 520px;
  display: grid;
  place-items: center;
}

.cover-card {
  position: relative;
  width: min(100%, 520px);
  border-radius: 28px;
  overflow: hidden;
  background: linear-gradient(135deg, #d6ecff 0%, #ebf3ff 100%);
  border: 1px solid rgba(49, 89, 255, 0.12);
  box-shadow: 0 24px 60px rgba(49, 89, 255, 0.14);
}

.cover-fallback {
  aspect-ratio: 16 / 10;
  display: grid;
  align-items: end;
  padding: 28px;
  background:
    radial-gradient(circle at top right, rgba(49, 89, 255, 0.16), transparent 28%),
    linear-gradient(135deg, #f5fbff 0%, #dceeff 100%);
}

.cover-text {
  display: grid;
  gap: 10px;
  max-width: 68%;
}

.cover-text span {
  font-size: 22px;
  font-weight: 500;
}

.cover-text strong {
  font-size: 40px;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.cover-text small {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.7;
}

.cover-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.floating-chip {
  position: absolute;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  padding: 12px 16px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: 0 20px 32px rgba(49, 89, 255, 0.08);
  color: var(--text);
  font-weight: 700;
  backdrop-filter: blur(12px);
}

.chip-training { top: 88px; left: 12px; }
.chip-campus { top: 132px; right: -10px; }
.chip-interview { bottom: 132px; left: 24px; }
.chip-family { bottom: 84px; right: 10px; }

.main-content {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.scan-section {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 28px;
  padding: 30px;
}

.scan-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.scan-notes span {
  font-size: 14px;
  color: var(--brand);
  background: rgba(49, 89, 255, 0.08);
  border-radius: 999px;
  padding: 10px 14px;
}

.qr-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(245, 249, 255, 0.92) 100%);
  border: 1px solid rgba(49, 89, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: grid;
  gap: 18px;
  align-content: start;
}

.qr-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.qr-badge,
.qr-status {
  font-size: 13px;
  font-weight: 700;
  border-radius: 999px;
  padding: 8px 12px;
}

.qr-badge {
  color: var(--brand);
  background: rgba(49, 89, 255, 0.08);
}

.qr-status {
  color: var(--success);
  background: rgba(15, 159, 110, 0.1);
}

.qr-frame {
  border-radius: 26px;
  background: #fff;
  padding: 18px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(15, 23, 42, 0.06);
}

.qr-placeholder {
  width: min(100%, 280px);
  aspect-ratio: 1 / 1;
  border-radius: 24px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
  color: var(--muted);
  background:
    linear-gradient(135deg, rgba(49, 89, 255, 0.06) 0%, rgba(77, 182, 255, 0.08) 100%);
  border: 1px dashed rgba(49, 89, 255, 0.18);
}

.qr-frame img {
  width: min(100%, 280px);
  aspect-ratio: 1 / 1;
  object-fit: contain;
}

.qr-tip {
  margin: 0;
  color: var(--muted);
  text-align: center;
  line-height: 1.7;
}

.section-head {
  margin-bottom: 24px;
}

.section-head h2 {
  margin: 12px 0 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.feature-section,
.scenario-section,
.free-tools-section,
.trial-section {
  padding: 30px;
}

.feature-grid,
.free-tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feature-card,
.tool-card {
  padding: 24px;
  border-radius: 22px;
  background: linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
  border: 1px solid rgba(49, 89, 255, 0.08);
}

.feature-card h3,
.tool-card h3,
.scenario-column h3 {
  margin: 0 0 12px;
  font-size: 22px;
}

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

.scenario-column {
  padding: 24px;
  border-radius: 22px;
  background: linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
  border: 1px solid rgba(49, 89, 255, 0.08);
}

.scenario-column ul,
.trial-card ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
}

.trial-card {
  padding: 28px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(49, 89, 255, 0.06) 0%, rgba(77, 182, 255, 0.06) 100%);
  border: 1px solid rgba(49, 89, 255, 0.1);
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 24px 4px 10px;
  color: var(--muted);
}

.footer strong {
  color: var(--text);
}

.footer a {
  color: var(--brand);
  background: rgba(49, 89, 255, 0.08);
  border: 1px solid rgba(49, 89, 255, 0.12);
}

@media (max-width: 1080px) {
  .hero-grid,
  .scan-section,
  .feature-grid,
  .free-tools-grid,
  .scenario-columns {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 420px;
  }

  .qr-card {
    max-width: 420px;
  }
}

@media (max-width: 720px) {
  .site-shell {
    padding: 14px;
  }

  .hero,
  .scan-section,
  .feature-section,
  .scenario-section,
  .free-tools-section,
  .trial-section {
    padding: 22px;
  }

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

  .domain-pill,
  .footer a,
  .primary-btn,
  .secondary-btn {
    text-align: center;
  }

  .hero-visual {
    min-height: 360px;
  }

  .floating-chip {
    font-size: 14px;
    min-width: 92px;
    padding: 10px 12px;
  }

  .chip-training { top: 38px; left: 0; }
  .chip-campus { top: 72px; right: -4px; }
  .chip-interview { bottom: 92px; left: 8px; }
  .chip-family { bottom: 44px; right: 0; }
}