/* ─── Reset & Base ────────────────────────────────────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --primary: #f22f46;
  --primary-hover: #d91c35;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --success-bg: #ecfdf5;
  --success-border: #6ee7b7;
  --success-text: #065f46;
  --error-bg: #fef2f2;
  --error-border: #fca5a5;
  --error-text: #991b1b;
  --warning-bg: #fffbeb;
  --warning-border: #fcd34d;
  --warning-text: #92400e;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 24px rgba(0, 0, 0, 0.12), 0 8px 48px rgba(0, 0, 0, 0.08);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 24px;
  -webkit-font-smoothing: antialiased;
}

/* ─── Layout ──────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 900px;
}

/* ─── Side-by-Side Main Layout ────────────────────────── */
.main-layout {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.form-panel {
  flex: 1;
  min-width: 0;
}

.preview-panel {
  flex-shrink: 0;
  position: sticky;
  top: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.preview-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* ─── Animations ──────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.spinner {
  animation: spin 0.8s linear infinite;
}

/* ─── Responsive ──────────────────────────────────────── */
@media (max-width: 780px) {
  .main-layout {
    flex-direction: column;
  }

  .preview-panel {
    position: static;
    width: 100%;
    order: -1;
  }

  .phone-mockup {
    width: 260px !important;
  }
}

@media (max-width: 520px) {
  body {
    padding: 16px;
  }
}