:root {
  --bg: #eef4fb;
  --surface: rgba(255, 255, 255, 0.76);
  --card: rgba(255, 255, 255, 0.88);
  --line: rgba(15, 23, 42, 0.12);
  --text: #0f172a;
  --muted: #475569;
  --accent: #0369a1;
  --accent-2: #0f766e;
  --shadow: 0 22px 44px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans SC", "Space Grotesk", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 10% 10%, #dbeafe 0%, transparent 40%),
    radial-gradient(circle at 90% 14%, #ccfbf1 0%, transparent 38%), var(--bg);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

.bg-blur {
  position: fixed;
  width: 42vmax;
  height: 42vmax;
  border-radius: 999px;
  filter: blur(80px);
  z-index: -1;
  opacity: 0.34;
}

.bg-blur-a {
  background: #93c5fd;
  top: -12vmax;
  left: -8vmax;
}

.bg-blur-b {
  background: #5eead4;
  right: -12vmax;
  bottom: -14vmax;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px clamp(18px, 5vw, 72px);
  backdrop-filter: blur(12px);
  background: rgba(238, 244, 251, 0.76);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--text);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  flex-wrap: wrap;
}

.nav a {
  color: #1f2937;
  text-decoration: none;
  font-size: 0.92rem;
}

.nav-cta {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #ffffff;
}

.section {
  width: min(1120px, 92vw);
  margin: 0 auto;
  padding: clamp(48px, 7vw, 88px) 0;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(26px, 5vw, 70px);
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #0c4a6e;
  margin-bottom: 10px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4.8vw, 3.9rem);
  line-height: 1.1;
}

.subtitle {
  margin-top: 16px;
  color: var(--muted);
  max-width: 62ch;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 12px 18px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #ffffff;
  box-shadow: 0 12px 24px rgba(3, 105, 161, 0.3);
}

.btn-ghost {
  border: 1px solid var(--line);
  color: #0f172a;
  background: #ffffff;
}

.btn-large {
  padding: 15px 28px;
}

.quick-stats {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.quick-stats li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}

.quick-stats span {
  display: block;
  font-size: 0.8rem;
  color: #64748b;
}

.quick-stats strong {
  font-size: 0.94rem;
}

.hero-media img,
.split-media img {
  width: 100%;
  display: block;
  border-radius: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.section-head h2 {
  margin: 6px 0 8px;
  font-size: clamp(1.65rem, 2.7vw, 2.4rem);
}

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

.feature-grid,
.download-grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature-card,
.download-card {
  padding: 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.feature-card h3,
.download-card h3 {
  margin: 0 0 8px;
}

.feature-card p,
.download-card p {
  margin: 0;
  color: var(--muted);
}

.download-card .btn {
  margin-top: 14px;
}

.download-passcode {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(24px, 4vw, 52px);
}

.detail-list {
  margin: 14px 0 0;
  padding-left: 18px;
}

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

.steps {
  margin: 14px 0 0;
  padding-left: 20px;
  max-width: 84ch;
}

.steps li + li {
  margin-top: 10px;
}

.chips {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chips span {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 0.92rem;
}

.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid var(--line);
  background: linear-gradient(125deg, rgba(255, 255, 255, 0.88), rgba(224, 242, 254, 0.7));
  border-radius: 20px;
  padding: clamp(20px, 4vw, 38px);
}

.cta h2 {
  margin: 8px 0;
}

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

.contact p,
.contact a {
  color: var(--muted);
}

.agreement-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding-top: 0;
}

.agreement-card {
  padding: 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.agreement-card h3 {
  margin: 0 0 10px;
}

.agreement-card p {
  margin: 0;
  color: var(--muted);
}

.agreement-list {
  margin: 0;
  padding-left: 20px;
}

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

.agreement-note {
  margin-top: 10px !important;
  font-size: 0.9rem;
}

.agreement-card-danger {
  border-color: rgba(220, 38, 38, 0.25);
  background: linear-gradient(135deg, rgba(254, 242, 242, 0.82), rgba(255, 255, 255, 0.9));
}

.agreement-check {
  margin-top: 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #1f2937;
}

.agreement-check input {
  width: 16px;
  height: 16px;
  accent-color: #0369a1;
}

.btn-disabled,
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.42);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 50;
}

.modal-backdrop.is-open {
  display: flex;
}

.modal-card {
  width: min(440px, 94vw);
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(224, 242, 254, 0.9));
  box-shadow: var(--shadow);
  padding: 24px;
  text-align: center;
}

.modal-card h3 {
  margin: 0 0 8px;
}

.modal-card p {
  margin: 0;
  color: var(--muted);
}

.qq-number {
  margin: 10px 0 18px !important;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #0c4a6e !important;
}

.site-footer {
  width: min(1120px, 92vw);
  margin: 0 auto;
  padding: 10px 0 40px;
  color: #64748b;
  font-size: 0.9rem;
}

.reveal {
  opacity: 1;
  transform: none;
}

body.js-ready .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

body.js-ready .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1060px) {
  .hero,
  .split,
  .feature-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 760px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .quick-stats {
    grid-template-columns: 1fr;
  }
}
.video-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.video-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.72);
  padding: 12px;
}

.video-card h4 {
  margin: 0 0 10px;
}

.agreement-video {
  width: 100%;
  border-radius: 10px;
  border: 1px solid #d7e1ef;
  background: #000000;
}

.video-card .btn {
  margin-top: 10px;
}
@media (max-width: 900px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
}