:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-pressed: #1e40af;
  --on-primary: #ffffff;
  --bg: #f3f4f6;
  --surface: #ffffff;
  --surface-variant: #eef0f4;
  --text: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --border: #d1d5db;
  --accent-soft: #dbeafe;
  --shadow: 0 18px 40px rgba(17, 24, 39, 0.08);
  --radius: 16px;
  --header-h: 64px;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--primary);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--primary);
  color: var(--on-primary);
  border-radius: 8px;
}

.skip-link:focus {
  top: 12px;
}

.wrap {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.header-inner,
.footer-inner,
.hero-actions {
  display: flex;
}

.header-inner {
  height: var(--header-h);
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--surface);
}

.brand-name {
  font-weight: 650;
  letter-spacing: -0.02em;
}

.header-download {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 8px;
}

.header-download:hover,
.header-download:focus-visible {
  background: var(--accent-soft);
  color: var(--primary);
}

.hero {
  padding: 56px 0 32px;
  scroll-margin-top: var(--header-h);
}

.hero-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  font-weight: 650;
  font-size: 0.95rem;
}

h1,
h2,
h3 {
  letter-spacing: -0.03em;
  line-height: 1.2;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 5vw, 3.1rem);
}

h2 {
  margin: 0 0 8px;
  font-size: clamp(1.6rem, 3vw, 2rem);
}

h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.lede,
.section-lead {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.hero-actions {
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 12px;
  font-weight: 650;
  text-decoration: none;
}

.btn-primary {
  color: var(--on-primary);
  background: var(--primary);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-primary:active {
  background: var(--primary-pressed);
}

.btn:focus-visible,
.header-download:focus-visible,
.brand:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--primary) 45%, white);
  outline-offset: 2px;
}

.hero-meta,
.hero-size,
.site-footer {
  color: var(--text-secondary);
}

.hero-meta,
.hero-size {
  margin: 0;
  font-size: 0.95rem;
}

.hero-size {
  color: var(--text-muted);
}

.hero-visual {
  margin: 0;
}

.features,
.shots-section {
  padding: 28px 0 48px;
}

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

.feature-grid,
.shot-grid {
  display: grid;
  gap: 16px;
}

.feature-grid {
  grid-template-columns: 1fr;
  padding: 0;
  margin: 0;
  list-style: none;
}

.feature-card,
.shot {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.feature-card {
  padding: 22px;
}

.feature-card p {
  margin: 0;
  color: var(--text-secondary);
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--primary);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.shot {
  position: relative;
  overflow: hidden;
  margin: 0;
  aspect-ratio: 16 / 10;
  background: var(--surface-variant);
  box-shadow: var(--shadow);
}

.shot img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.shot.is-placeholder img {
  display: none;
}

.shot.is-placeholder::after {
  content: attr(data-label);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  text-align: center;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-inner {
  min-height: 88px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 16px 0;
  text-align: center;
}

.footer-inner p {
  margin: 0;
}

.footer-beian a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-beian a:hover,
.footer-beian a:focus-visible {
  color: var(--primary);
}

.beian-icon {
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
}

@media (min-width: 800px) {
  .hero {
    padding: 80px 0 48px;
  }

  .hero-grid {
    grid-template-columns: 1fr 1.05fr;
  }

  .feature-grid {
    grid-template-columns: 1fr 1fr;
  }

  .shot-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

@media (max-width: 799px) {
  .btn-primary {
    width: 100%;
  }

  .hero-actions {
    align-items: stretch;
  }

  .footer-inner {
    padding: 16px 0 20px;
  }
}