/* ============ 디자인 토큰 ============ */
:root {
  --accent: #f97316;
  --accent2: #0ea5e9;
  --ink: #1a1a2e;
  --muted: #64748b;
  --bg: #fafafa;
  --card: #ffffff;
  --border: #e5e7eb;
  --green: #10b981;

  --space-section: clamp(2.5rem, 2rem + 3vw, 5rem);
  --container-max: 800px;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f8fafc;
    --muted: #94a3b8;
    --bg: #0f172a;
    --card: #1e293b;
    --border: #334155;
  }
}

/* ============ Base ============ */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Apple SD Gothic Neo', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.2rem;
}

/* ============ HERO ============ */
.hero {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  color: white;
  padding: clamp(3rem, 2rem + 5vw, 6rem) 0 clamp(2.5rem, 2rem + 4vw, 5rem);
  text-align: center;
}
.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.8rem, 1.2rem + 2.5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero .tagline {
  margin: 0;
  font-size: clamp(1rem, 0.85rem + 0.6vw, 1.25rem);
  opacity: 0.95;
  font-weight: 400;
}

/* ============ 데모 카드 ============ */
.demo-card {
  margin-top: -2.5rem;
  margin-bottom: var(--space-section);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.screenshot {
  display: block;
  width: 100%;
  height: auto;
  background: #f1f5f9;
  border-bottom: 1px solid var(--border);
}

.cta {
  padding: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary {
  background: var(--accent);
  color: white;
}
.btn-primary[aria-disabled="true"] {
  background: var(--muted);
  cursor: not-allowed;
  opacity: 0.7;
}
.btn-primary:hover:not([aria-disabled="true"]) {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(249, 115, 22, 0.35);
}
.btn-secondary {
  background: var(--card);
  color: var(--ink);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

.badge {
  background: rgba(255, 255, 255, 0.25);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

/* ============ Sections ============ */
section {
  margin-bottom: var(--space-section);
}
section h2 {
  font-size: clamp(1.3rem, 1rem + 1vw, 1.8rem);
  margin: 0 0 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
section p {
  color: var(--muted);
  font-size: 1.05rem;
}

/* ============ Tech Stack ============ */
.stack {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.stack li {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent2);
}

/* ============ 어떻게 만들었나 ============ */
.howto p {
  background: var(--card);
  border-left: 4px solid var(--accent);
  padding: 1.2rem 1.4rem;
  border-radius: 6px;
  color: var(--ink);
  margin: 0;
}

/* ============ Comments ============ */
.comments .comments-note {
  font-size: 0.9rem;
  margin: 0 0 1.5rem;
}
.giscus, .giscus-frame {
  width: 100%;
  min-height: 200px;
}

/* ============ Footer ============ */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 3rem;
  text-align: center;
}
footer p {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0;
}
footer a {
  color: var(--accent2);
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}

/* ============ 모바일 ============ */
@media (max-width: 480px) {
  .demo-card { margin-top: -1.5rem; border-radius: 8px; }
  .cta { padding: 1rem; flex-direction: column; }
  .btn { justify-content: center; width: 100%; }
}