/* TaskBoard LP — アプリ本体(frontend/src/index.css)と同じ配色でブランドを揃えている */
:root {
  --ink: #1c2430;
  --ink-soft: #5b6472;
  --paper: #f4f5f2;
  --card: #ffffff;
  --line: #dcdfd9;
  --accent: #2f6f5e;
  --accent-deep: #24564a;
  --accent-soft: #e3efe9;
}

* { box-sizing: border-box; margin: 0; }

body {
  font-family: 'Helvetica Neue', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', Meiryo, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
}

.container { max-width: 880px; margin: 0 auto; padding: 0 24px; }

/* ---- nav ---- */
.nav { background: var(--card); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 60px; }
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: 0.06em; }

/* ---- buttons ---- */
.btn {
  display: inline-block; background: var(--accent); color: #fff;
  text-decoration: none; border-radius: 8px; font-weight: 600;
  transition: background 0.15s;
}
.btn:hover { background: var(--accent-deep); }
.btn-small { padding: 8px 18px; font-size: 0.9rem; }
.btn-large { padding: 14px 40px; font-size: 1.05rem; }
.btn-invert { background: #fff; color: var(--accent); }
.btn-invert:hover { background: var(--accent-soft); }

/* ---- hero ---- */
.hero { padding: 88px 0 96px; text-align: center; }
.eyebrow {
  display: inline-block; background: var(--accent-soft); color: var(--accent);
  font-size: 0.85rem; font-weight: 700; padding: 4px 14px; border-radius: 999px;
  margin-bottom: 20px; letter-spacing: 0.05em;
}
.hero h1 { font-size: 2.7rem; line-height: 1.35; letter-spacing: 0.02em; margin-bottom: 20px; }
.lead { color: var(--ink-soft); font-size: 1.05rem; margin-bottom: 32px; }
.hero-note { color: var(--ink-soft); font-size: 0.85rem; margin-top: 12px; }

/* ---- features ---- */
.features { background: var(--card); padding: 72px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.features h2, .flow h2, .cta h2 { font-size: 1.7rem; text-align: center; margin-bottom: 12px; }
.section-lead { text-align: center; color: var(--ink-soft); margin-bottom: 44px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: 12px; padding: 26px 22px;
}
.feature-num { color: var(--accent); font-weight: 700; font-size: 0.9rem; letter-spacing: 0.12em; margin-bottom: 10px; }
.feature h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature p { color: var(--ink-soft); font-size: 0.92rem; }

/* ---- flow ---- */
.flow { padding: 72px 0; }
.steps { list-style: none; max-width: 520px; margin: 36px auto 0; display: flex; flex-direction: column; gap: 16px; }
.steps li {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 16px 20px; display: flex; align-items: center; gap: 16px; font-weight: 500;
}
.step-n {
  flex: none; width: 32px; height: 32px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center; font-size: 0.95rem;
}

/* ---- cta ---- */
.cta { background: var(--accent); color: #fff; text-align: center; padding: 72px 0; }
.cta h2 { color: #fff; margin-bottom: 28px; }
.cta-note { margin-top: 14px; font-size: 0.85rem; opacity: 0.85; }

/* ---- footer ---- */
.footer { padding: 28px 0; text-align: center; color: var(--ink-soft); font-size: 0.85rem; }

@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  .feature-grid { grid-template-columns: 1fr; }
}