:root {
  /* 更明亮的浅色基调，保留紫色主色 */
  --bg: #f3f4ff;
  --bg-alt: #eef2ff;
  --bg-soft: #e0e7ff;
  --card-bg: #ffffff;
  --primary: #4f46e5;
  --primary-soft: rgba(129, 140, 248, 0.18);
  --primary-strong: #6366f1;
  --accent: #22c55e;
  --text: #111827;
  --text-soft: #6b7280;
  --border-subtle: rgba(148, 163, 184, 0.35);
  --radius-lg: 18px;
  --radius-xl: 26px;
  --shadow-soft: 0 18px 60px rgba(15, 23, 42, 0.25);
  --shadow-card: 0 14px 40px rgba(15, 23, 42, 0.18);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "PingFang SC", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #ede9fe 0, #eef2ff 40%, #e5e7eb 100%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(148, 163, 184, 0.3);
  backdrop-filter: blur(18px);
  background: linear-gradient(
    to bottom,
    rgba(248, 250, 252, 0.95),
    rgba(248, 250, 252, 0.92),
    rgba(248, 250, 252, 0.9)
  );
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 12px;
  background: radial-gradient(circle at 30% 10%, #c4b5fd, #4f46e5);
  box-shadow: 0 8px 18px rgba(129, 140, 248, 0.4);
}

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

.brand-name {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 12px;
  color: var(--text-soft);
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
}

.nav a {
  color: var(--text-soft);
  position: relative;
  padding: 4px 0;
  transition: color 0.18s ease;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--primary), var(--accent));
  transition: width 0.2s ease;
}

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

.nav a:hover::after {
  width: 100%;
}

.nav-download {
  padding: 9px 56px;
  border-radius: 6px;
  border: 1px solid rgba(129, 140, 248, 0.7);
  background: radial-gradient(circle at top left, #4f46e5, #a855f7 60%);
  color: #f9fafb !important;
  box-shadow: 0 12px 30px rgba(129, 140, 248, 0.6);
  font-size: 13px;
}

.hero {
  padding: 64px 0 48px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 36px;
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.1;
  margin: 0 0 16px;
  letter-spacing: 0.02em;
}

.hero-subtitle {
  margin: 0 0 16px;
  color: var(--text-soft);
  font-size: 14px;
}

.hero-bullets {
  margin: 0 0 20px;
  padding-left: 18px;
  color: var(--text-soft);
  font-size: 14px;
}

.hero-bullets li + li {
  margin-top: 4px;
}

.hero-cta {
  margin-top: 18px;
}

.download-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease,
    border-color 0.16s ease, color 0.16s ease;
}

.btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  box-shadow: 0 16px 40px rgba(129, 140, 248, 0.55);
  color: #f9fafb;
}

.btn.outline {
  background: rgba(248, 250, 252, 0.9);
  border-color: rgba(148, 163, 184, 0.7);
  color: var(--primary);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.9);
}

.download-hint {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-soft);
}

.qrcode-placeholder {
  margin-top: 12px;
  width: 124px;
  height: 124px;
  border-radius: 18px;
  border: 1px dashed rgba(148, 163, 184, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--text-soft);
  background: rgba(248, 250, 252, 0.95);
}

.env-note {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 14px;
  background: radial-gradient(circle at top left, rgba(129, 140, 248, 0.18), rgba(248, 250, 252, 0.98));
  border: 1px solid rgba(129, 140, 248, 0.75);
  font-size: 12px;
  color: var(--text-soft);
}

.env-note h3 {
  margin: 0 0 6px;
  font-size: 13px;
  color: #111827;
}

.env-note ul {
  margin: 0;
  padding-left: 16px;
}

.env-note li + li {
  margin-top: 2px;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.phone-mock {
  width: 280px;
  aspect-ratio: 9 / 19.5;
  border-radius: 36px;
  padding: 10px;
  background: radial-gradient(circle at top, #e0e7ff, #eef2ff);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.45);
  position: relative;
  overflow: hidden;
}

.phone-mock.small {
  width: 230px;
}

.phone-screen {
  width: 100%;
  height: 100%;
  border-radius: 26px;
  overflow: hidden;
  background: #ffffff;
}

.phone-caption {
  position: absolute;
  left: 50%;
  bottom: 10px;
  transform: translateX(-50%);
  font-size: 11px;
  color: var(--text-soft);
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(148, 163, 184, 0.7);
  backdrop-filter: blur(10px);
}

.section {
  padding: 40px 0;
}

.section-alt {
  background: radial-gradient(circle at top left, #eef2ff, #e0f2fe 55%, #e5e7eb 100%);
}

.section-header {
  max-width: 640px;
  margin: 0 auto 24px;
  text-align: center;
}

.section-header h2 {
  font-size: 22px;
  margin: 0 0 10px;
}

.section-header p {
  margin: 0;
  font-size: 14px;
  color: var(--text-soft);
}

.section-header-desc {
  margin: 0;
  font-size: 14px;
  color: var(--text-soft);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cards-grid {
  display: grid;
  gap: 16px;
}

.columns-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  background: radial-gradient(circle at top left, #f9fafb, #eef2ff 80%);
  border-radius: var(--radius-lg);
  padding: 18px;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.card p {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--text-soft);
}

.tag {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  background: rgba(238, 242, 255, 0.9);
  border: 1px solid rgba(129, 140, 248, 0.7);
  color: #4f46e5;
}

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 40px 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.feature-row:last-child {
  border-bottom: 0;
  padding-bottom: 20px;
}

.feature-row-reverse .feature-row-content {
  order: 2;
}

.feature-row-reverse .feature-row-visual {
  order: 1;
}

.feature-row-content {
  max-width: 480px;
}

.feature-row-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  background: rgba(129, 140, 248, 0.14);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.feature-row-title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
}

.feature-row-lead {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-soft);
}

.feature-row-list {
  margin: 0;
  padding-left: 18px;
  list-style: none;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.feature-row-list li {
  position: relative;
  padding-left: 0;
  margin-bottom: 6px;
}

.feature-row-list li::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0.7;
  transform: translateY(-50%);
}

.feature-row-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-mock {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.15);
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: #fff;
}

.feature-mock img {
  display: block;
  width: 100%;
  height: auto;
}

.feature-mock-duo {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 12px;
  padding: 12px;
}

.feature-mock-single {
  max-width: 320px;
  padding: 12px;
}

.feature-mock-phone {
  padding: 0;
  background: transparent;
  border: 0;
  box-shadow: none;
}

.feature-mock-phone .phone-mock {
  margin: 0 auto;
}

.timeline {
  margin-top: 18px;
  border-left: 1px dashed rgba(129, 140, 248, 0.6);
  padding-left: 14px;
}

.timeline-item {
  position: relative;
  padding-bottom: 14px;
}

.timeline-badge {
  position: absolute;
  left: -28px;
  top: 0;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  background: radial-gradient(circle at top, var(--primary), var(--accent));
  color: #f9fafb;
  box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.25);
}

.timeline-content h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.timeline-content p {
  margin: 0;
  font-size: 13px;
  color: var(--text-soft);
}

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

.step {
  position: relative;
  padding: 16px 14px 14px 14px;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at top left, #f9fafb, #eef2ff 70%);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.step-index {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(248, 250, 252, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.8);
  color: var(--text-soft);
}

.step h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.step p {
  margin: 0;
  font-size: 13px;
  color: var(--text-soft);
}

.faq-list {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

.faq-item {
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  background: rgba(248, 250, 252, 0.96);
  border: 1px solid var(--border-subtle);
}

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.faq-item p {
  margin: 0;
  font-size: 13px;
  color: var(--text-soft);
}

.site-footer {
  margin-top: auto;
  border-top: 1px solid rgba(148, 163, 184, 0.3);
  background: radial-gradient(circle at top, #eef2ff, #e5e7eb 55%);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 12px;
  color: var(--text-soft);
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-logo-text {
  font-weight: 500;
  color: var(--text);
}

.footer-slogan {
  font-size: 11px;
}

.footer-meta {
  font-size: 11px;
}

.footer-right-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 10px 16px;
}

.footer-link {
  color: var(--primary);
  text-decoration: none;
  font-size: 12px;
}

.footer-link:hover {
  text-decoration: underline;
}

.brand-link {
  text-decoration: none;
  color: inherit;
}

.legal-page {
  flex: 1;
  padding: 32px 0 48px;
}

.legal-inner {
  max-width: 720px;
}

.legal-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.legal-title {
  margin: 0 0 8px;
  font-size: clamp(24px, 4vw, 28px);
  font-weight: 600;
  color: var(--text);
}

.legal-updated {
  margin: 0;
  font-size: 13px;
  color: var(--text-soft);
}

.legal-body {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

.legal-intro {
  margin: 0 0 28px;
  color: var(--text-soft);
}

.legal-section {
  margin-bottom: 28px;
}

.legal-section:last-child {
  margin-bottom: 0;
}

.legal-section h2 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.legal-section > p {
  margin: 0;
  color: var(--text-soft);
}

.legal-list {
  margin: 0;
  padding-left: 1.25em;
}

.legal-list-numbered {
  list-style: decimal;
}

.legal-list li {
  margin-bottom: 10px;
  color: var(--text-soft);
}

.legal-list li:last-child {
  margin-bottom: 0;
}

.legal-sublist {
  margin: 8px 0 0;
  padding-left: 1.25em;
  list-style: disc;
}

.legal-sublist li {
  margin-bottom: 8px;
}

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding-top: 32px;
  }

  .hero-visual {
    order: -1;
    margin-bottom: 12px;
  }

  .feature-row {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0;
    text-align: center;
  }

  .feature-row-reverse .feature-row-content,
  .feature-row-reverse .feature-row-visual {
    order: unset;
  }

  .feature-row-content {
    max-width: 100%;
  }

  .feature-row-num {
    margin-left: auto;
    margin-right: auto;
  }

  .feature-row-title {
    font-size: 18px;
  }

  .feature-row-list {
    text-align: left;
  }

  .feature-mock-single {
    max-width: 100%;
  }

  .columns-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .nav {
    display: none;
  }
}

@media (max-width: 640px) {
  .footer-right-wrap {
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
  }

  .container {
    padding: 0 16px;
  }

  .header-inner {
    padding-inline: 16px;
  }

  .hero {
    padding-top: 24px;
  }

  .columns-4 {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .phone-mock {
    width: 240px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}