/* ── MD3 토큰 ──────────────────────────────── */
:root {
  --md-primary:        #6750A4;
  --md-on-primary:     #FFFFFF;
  --md-primary-con:    #EADDFF;
  --md-secondary:      #E94560;
  --md-on-secondary:   #FFFFFF;
  --md-surface:        #FFFBFE;
  --md-surface-v:      #E6E0E9;
  --md-on-surface:     #1C1B1F;
  --md-on-surface-var: #49454F;
  --md-outline:        #79747E;
  --md-outline-var:    #CAC4D0;
  --md-bg:             #FFFBFE;
  --md-elev1: 0 1px 2px rgba(0,0,0,.3), 0 1px 3px 1px rgba(0,0,0,.15);
  --md-elev2: 0 1px 2px rgba(0,0,0,.3), 0 2px 6px 2px rgba(0,0,0,.15);
  --md-elev3: 0 4px 8px 3px rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.3);
}

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

body {
  font-family: 'Roboto', sans-serif;
  background: var(--md-bg);
  color: var(--md-on-surface);
  min-height: 100vh;
}

/* ── App Bar ───────────────────────────────── */
.app-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--md-surface);
  box-shadow: var(--md-elev1);
  display: flex;
  align-items: center;
  padding: 0 24px;
  height: 64px;
  gap: 16px;
}
.app-bar-logo {
  font-family: 'Roboto Mono', monospace;
  font-size: 22px;
  font-weight: 700;
  color: var(--md-primary);
  letter-spacing: 2px;
}
.app-bar-logo span { color: var(--md-secondary); }
.app-bar-spacer { flex: 1; }
.app-bar-nav {
  font-size: 14px;
  font-weight: 500;
  color: var(--md-on-surface-var);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 20px;
  border: none;
  background: none;
  transition: background 0.2s;
}
.app-bar-nav:hover { background: rgba(103,80,164,.08); color: var(--md-primary); }

/* ── Hero ──────────────────────────────────── */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 80px;
  padding: 80px 48px;
  min-height: calc(100vh - 64px);
  flex-wrap: wrap;
}

.hero-text { max-width: 480px; }
.hero-eyebrow {
  display: inline-block;
  background: var(--md-primary-con);
  color: var(--md-primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  text-transform: uppercase;
}
.hero-title {
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 300;
  letter-spacing: -1px;
  line-height: 1.05;
  color: var(--md-on-surface);
  margin-bottom: 6px;
}
.hero-title strong {
  font-weight: 700;
  color: var(--md-primary);
}
.hero-sub {
  font-size: 18px;
  color: var(--md-on-surface-var);
  font-weight: 300;
  line-height: 1.6;
  margin-bottom: 40px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ── MD3 Buttons ───────────────────────────── */
.btn-filled {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 20px;
  border: none;
  background: var(--md-primary);
  color: var(--md-on-primary);
  font-family: 'Roboto', sans-serif;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  cursor: pointer;
  box-shadow: var(--md-elev1);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: box-shadow 0.2s;
}
.btn-filled:hover { box-shadow: var(--md-elev2); }
.btn-filled::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background 0.2s;
}
.btn-filled:hover::after { background: rgba(255,255,255,0.08); }

.btn-tonal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 20px;
  border: none;
  background: var(--md-primary-con);
  color: var(--md-primary);
  font-family: 'Roboto', sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: box-shadow 0.2s;
}
.btn-tonal:hover { box-shadow: var(--md-elev1); }

.btn-outlined {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 20px;
  border: 1px solid var(--md-outline);
  background: transparent;
  color: var(--md-primary);
  font-family: 'Roboto', sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}
.btn-outlined:hover { background: rgba(103,80,164,.08); }

/* ── Canvas Preview ────────────────────────── */
.hero-preview { position: relative; }
.preview-card {
  background: #1a1a2e;
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--md-elev3);
  position: relative;
  overflow: hidden;
}
.preview-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(103,80,164,.2), transparent 60%);
  pointer-events: none;
}
#preview-canvas { display: block; border-radius: 8px; }
.preview-badge {
  position: absolute;
  bottom: 32px;
  right: 32px;
  background: var(--md-secondary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: 12px;
  text-transform: uppercase;
}

/* ── Feature Cards ─────────────────────────── */
.section {
  padding: 64px 48px;
  max-width: 1100px;
  margin: 0 auto;
}
.section-title {
  font-size: 28px;
  font-weight: 400;
  color: var(--md-on-surface);
  margin-bottom: 8px;
}
.section-sub {
  font-size: 14px;
  color: var(--md-on-surface-var);
  margin-bottom: 40px;
}
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.card {
  background: var(--md-surface);
  border: 1px solid var(--md-outline-var);
  border-radius: 16px;
  padding: 24px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow: var(--md-elev2); transform: translateY(-2px); }
.card-icon { font-size: 32px; margin-bottom: 16px; }
.card-title {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--md-on-surface);
}
.card-body {
  font-size: 14px;
  color: var(--md-on-surface-var);
  line-height: 1.6;
}

/* ── CTA ───────────────────────────────────── */
.cta {
  background: var(--md-primary);
  color: var(--md-on-primary);
  text-align: center;
  padding: 80px 48px;
}
.cta h2 { font-size: 36px; font-weight: 400; margin-bottom: 16px; }
.cta p  { font-size: 16px; opacity: .8; margin-bottom: 40px; }
.cta .btn-filled {
  background: var(--md-on-primary);
  color: var(--md-primary);
  font-size: 16px;
  padding: 14px 36px;
  border-radius: 28px;
}

/* ── Dialog ────────────────────────────────── */
.dialog-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.dialog-backdrop.open { display: flex; }

.dialog {
  background: var(--md-surface);
  border-radius: 28px;
  padding: 24px;
  max-width: 560px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0,0,0,.25);
  max-height: 90vh;
  overflow-y: auto;
  animation: dialog-in 0.2s ease;
}
@keyframes dialog-in {
  from { opacity: 0; transform: scale(0.92) translateY(16px); }
  to   { opacity: 1; transform: none; }
}
.dialog-title {
  font-size: 24px;
  font-weight: 400;
  color: var(--md-on-surface);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.step { display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start; }
.step-num {
  min-width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--md-primary-con);
  color: var(--md-primary);
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-content h4 { font-size: 15px; font-weight: 500; margin-bottom: 4px; color: var(--md-on-surface); }
.step-content p  { font-size: 14px; color: var(--md-on-surface-var); line-height: 1.6; }

.key-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 20px 0 28px;
  background: var(--md-surface-v);
  border-radius: 16px;
  padding: 16px;
}
.key-row { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--md-on-surface); }
.key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--md-surface);
  border: 1px solid var(--md-outline-var);
  border-radius: 8px;
  padding: 4px 10px;
  font-family: 'Roboto Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  color: var(--md-primary);
  box-shadow: 0 2px 0 var(--md-outline-var);
  white-space: nowrap;
  min-width: 36px;
}

.tip-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #FFF3E0;
  color: #E65100;
  font-size: 13px;
  border-radius: 12px;
  padding: 6px 14px;
  margin-bottom: 24px;
}
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }

/* ── Ripple ────────────────────────────────── */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  transform: scale(0);
  animation: ripple-anim 0.5s linear;
  pointer-events: none;
}
@keyframes ripple-anim {
  to { transform: scale(4); opacity: 0; }
}

/* ── Footer ────────────────────────────────── */
footer {
  text-align: center;
  padding: 24px;
  font-size: 12px;
  color: var(--md-on-surface-var);
  border-top: 1px solid var(--md-outline-var);
}