/* ── Shared design system for intro/consent/welcome/tutorial pages ── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f1117;
  --surface: #191c26;
  --border: rgba(255,255,255,0.08);
  --blue: #3b82f6;
  --blue-soft: rgba(59,130,246,0.12);
  --red: #ef4444;
  --red-soft: rgba(239,68,68,0.12);
  --grey: #9ca3af;
  --grey-soft: rgba(156,163,175,0.12);
  --text: #e8eaf0;
  --muted: #6b7280;
  --accent: #f59e0b;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.welcome-screen {
  max-width: 680px;
  width: 100%;
  animation: fadeUp 0.5s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Header ── */
.page-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.page-header h1 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
}

.page-header p {
  margin-top: 0.6rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ── Section title ── */
.section-title {
  font-family: 'Syne', sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

/* ── Notice ── */
.notice {
  background: rgba(245,158,11,0.07);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: 12px;
  padding: 1rem 1.2rem;
  margin-bottom: 1.6rem;
  font-size: 0.85rem;
  color: #d1d5db;
  line-height: 1.55;
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
}
.notice-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }

/* ── Primary button ── */
.btn-start {
  display: block;
  width: 100%;
  padding: 1rem;
  background: var(--accent);
  color: #0f1117;
  font-family: 'Syne', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.15s;
}
.btn-start:hover  { opacity: 0.9; transform: translateY(-1px); }
.btn-start:active { transform: translateY(0); }