/* Resonance Design System — see DESIGN.md */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,700;1,9..40,400&family=Instrument+Serif:ital@0;1&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Light theme (default) ────────────────────────────────── */

:root {
  /* Theme tokens */
  --bg: #FAFAF8;
  --surface: #FFFFFF;
  --surface-alt: #F3F3F0;
  --text: #1C1C1A;
  --text-muted: #6B6B66;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-subtle: #EFF6FF;
  --border: #E5E5E0;
  --border-strong: #D4D4CF;
  --success: #16A34A;
  --warning: #D97706;
  --error: #DC2626;
  --heading-font: 'Instrument Serif', Georgia, serif;
  --body-font: 'DM Sans', system-ui, sans-serif;
  --mono-font: 'JetBrains Mono', ui-monospace, monospace;

  /* Pico CSS overrides — map Pico vars to theme tokens */
  --pico-font-family: var(--body-font);
  --pico-background-color: var(--bg);
  --pico-color: var(--text);
  --pico-muted-color: var(--text-muted);
  --pico-primary: var(--primary);
  --pico-primary-hover: var(--primary-hover);
  --pico-primary-background: var(--primary);
  --pico-primary-inverse: #FFFFFF;
  --pico-card-background-color: var(--surface);
  --pico-card-border-color: var(--border);
  --pico-border-color: var(--border);
  --pico-muted-border-color: var(--border);
  --pico-form-element-border-color: var(--border);
  --pico-form-element-background-color: var(--surface);
  --pico-form-element-focus-color: var(--primary);
  --pico-table-border-color: var(--border);
  --pico-code-background-color: var(--surface-alt);
  --pico-code-color: var(--text);
  --pico-font-family-monospace: var(--mono-font);
  --pico-del-color: var(--error);
  --pico-color-green-500: var(--success);
  --pico-color-amber-500: var(--warning);

  /* Spacing scale (8px base) */
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Motion */
  --ease-enter: ease-out;
  --ease-exit: ease-in;
  --ease-move: ease-in-out;
  --dur-micro: 75ms;
  --dur-short: 200ms;
  --dur-medium: 300ms;
}

/* ── Dark theme ───────────────────────────────────────────── */

[data-theme="dark"] {
  --bg: #121214;
  --surface: #1E1E21;
  --surface-alt: #2A2A2E;
  --text: #E8E8E6;
  --text-muted: #9B9B96;
  --primary: #3B82F6;
  --primary-hover: #60A5FA;
  --primary-subtle: #1E293B;
  --border: #2E2E32;
  --border-strong: #3E3E42;

  --pico-primary-inverse: #121214;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121214;
    --surface: #1E1E21;
    --surface-alt: #2A2A2E;
    --text: #E8E8E6;
    --text-muted: #9B9B96;
    --primary: #3B82F6;
    --primary-hover: #60A5FA;
    --primary-subtle: #1E293B;
    --border: #2E2E32;
    --border-strong: #3E3E42;

    --pico-primary-inverse: #121214;
  }
}

/* ── Typography ───────────────────────────────────────────── */

body {
  font-family: var(--body-font);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: var(--heading-font);
  letter-spacing: 0.04em;
  line-height: 1.2;
}

h1 { font-size: 2.441rem; }
h2 { font-size: 1.953rem; }
h3 { font-size: 1.563rem; }
h4 { font-size: 1.25rem; }

code, pre, kbd, samp {
  font-family: var(--mono-font);
}

table {
  font-variant-numeric: tabular-nums;
}

/* ── Nav wordmark ─────────────────────────────────────────── */

.nav-wordmark {
  font-family: var(--heading-font);
  font-style: italic;
  letter-spacing: -0.04em;
  font-size: 1.25rem;
}

/* ── Theme toggle ─────────────────────────────────────────── */

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  padding: 0.25em 0.5em;
  font-size: 1rem;
  line-height: 1;
  color: var(--text-muted);
  transition: color var(--dur-short) var(--ease-enter),
              border-color var(--dur-short) var(--ease-enter);
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

/* ── Sound wave divider ───────────────────────────────────── */

.wave-divider {
  height: 24px;
  margin: var(--space-xl) 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 24'%3E%3Cpath d='M0 12 Q150 0 300 12 Q450 24 600 12 Q750 0 900 12 Q1050 24 1200 12' fill='none' stroke='%236B6B66' stroke-width='1'/%3E%3C/svg%3E");
  background-repeat: repeat-x;
  background-size: 1200px 24px;
  background-position: center;
  opacity: 0.06;
}

[data-theme="dark"] .wave-divider {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 24'%3E%3Cpath d='M0 12 Q150 0 300 12 Q450 24 600 12 Q750 0 900 12 Q1050 24 1200 12' fill='none' stroke='%239B9B96' stroke-width='1'/%3E%3C/svg%3E");
}

/* ── View-as pill ─────────────────────────────────────────── */

.view-as-pill {
  position: fixed;
  bottom: var(--space-md);
  left: var(--space-md);
  background: var(--pico-card-background-color);
  border: 1px solid var(--pico-muted-border-color);
  border-radius: var(--pico-border-radius);
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* ── Reduced motion ───────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}