:root {
  --bg: #fbf7f0;
  --surface: #ffffff;
  --ink: #2c2620;
  --ink-soft: #6b6256;
  --acorn: #8a5a2b;
  --acorn-deep: #6b4420;
  --leaf: #5f8a4b;
  --accent-soft: #f0e6d6;
  --border: #ece3d5;
  --radius: 18px;
  --shadow: 0 8px 30px rgba(110, 80, 40, 0.08);
  --maxw: 880px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Pretendard", "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--acorn); text-decoration: none; }
a:hover { color: var(--acorn-deep); text-decoration: underline; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Header ---- */
.site-header {
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
  background: rgba(251, 247, 240, 0.85);
  backdrop-filter: saturate(180%) blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand .acorn { font-size: 1.4rem; }
.nav a { margin-left: 20px; color: var(--ink-soft); font-weight: 500; }
.nav a:hover { color: var(--acorn); }

/* ---- Hero ---- */
.hero {
  text-align: center;
  padding: 72px 0 48px;
}
.hero .acorn-big { font-size: 3.4rem; display: block; margin-bottom: 12px; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 2.9rem);
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}
.hero p {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 540px;
  margin: 0 auto;
}

/* ---- App cards ---- */
.apps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  padding: 24px 0 64px;
}
.app-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.app-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(110, 80, 40, 0.14);
  text-decoration: none;
}
.app-card .icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 16px;
  background: var(--accent-soft);
}
.app-card h3 { margin: 0 0 6px; font-size: 1.25rem; color: var(--ink); }
.app-card p { margin: 0; color: var(--ink-soft); font-size: 0.98rem; }

/* ---- App detail page ---- */
.app-hero {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 56px 0 24px;
}
.app-hero .icon {
  width: 80px; height: 80px;
  border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.6rem;
  background: var(--accent-soft);
  flex-shrink: 0;
}
.app-hero h1 { margin: 0 0 4px; font-size: 2rem; letter-spacing: -0.02em; }
.app-hero .tagline { margin: 0; color: var(--ink-soft); font-size: 1.05rem; }

.section { padding: 16px 0 8px; }
.section h2 {
  font-size: 1.35rem;
  margin: 32px 0 14px;
  letter-spacing: -0.01em;
}
.feature-list { list-style: none; padding: 0; margin: 0; }
.feature-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  margin-bottom: 12px;
}
.feature-list li strong { color: var(--acorn-deep); }

/* ---- Legal / prose pages ---- */
.prose { padding: 48px 0 32px; }
.prose h1 { font-size: 1.9rem; margin: 0 0 6px; letter-spacing: -0.02em; }
.prose .meta { color: var(--ink-soft); font-size: 0.92rem; margin: 0 0 28px; }
.prose h2 { font-size: 1.25rem; margin: 32px 0 10px; }
.prose p, .prose li { color: var(--ink); }
.prose ul { padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.callout {
  background: var(--accent-soft);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 20px 0;
  color: var(--acorn-deep);
}

/* ---- Buttons ---- */
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px;
  border-radius: 12px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
}
.btn:hover { text-decoration: none; border-color: var(--acorn); color: var(--acorn-deep); }
.btn.primary { background: var(--acorn); color: #fff; border-color: var(--acorn); }
.btn.primary:hover { background: var(--acorn-deep); color: #fff; }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0 48px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.site-footer .wrap {
  display: flex; flex-wrap: wrap; gap: 8px 20px;
  align-items: center; justify-content: space-between;
}
.site-footer a { color: var(--ink-soft); }
.site-footer a:hover { color: var(--acorn); }

.crumb { padding-top: 24px; font-size: 0.9rem; }
.crumb a { color: var(--ink-soft); }

@media (max-width: 560px) {
  .app-hero { flex-direction: column; text-align: center; align-items: center; padding-top: 40px; }
  .nav a { margin-left: 14px; font-size: 0.95rem; }
}