:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --text: #10131a;
  --muted: #556070;
  --card: #ffffff;
  --border: #d8deea;
  --accent: #2fbf71;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1f2229;
    --text: #eef2f7;
    --muted: #a0adbf;
    --card: #2a2f39;
    --border: #3f4654;
    --accent: #49d488;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Noto Sans JP", sans-serif;
}

.hero {
  padding: 56px 20px 40px;
  background: linear-gradient(160deg, rgba(47, 191, 113, 0.18), transparent);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: 960px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 8px;
  font-weight: 700;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.15;
}

.lead {
  margin: 14px 0 0;
  color: var(--muted);
  max-width: 64ch;
}

.cta-row {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  background: var(--card);
  font-weight: 700;
  cursor: pointer;
}

.btn.primary {
  background: var(--accent);
  color: #072514;
  border-color: transparent;
}

.web-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}

.file-btn input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.file-btn {
  position: relative;
}

.container {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 20px;
  display: grid;
  gap: 14px;
}

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

.card h2 {
  margin: 0 0 8px;
  font-size: 18px;
}

.card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.footer {
  padding: 28px 20px 40px;
  text-align: center;
  color: var(--muted);
}