/* ===================================================
   itapp — Design Tokens & Base Stylesheet
   =================================================== */

:root {
  /* Type Scale — fluid */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 1rem + 6vw, 7rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 500ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 720px;
  --content-default: 1100px;
  --content-wide: 1320px;

  /* Fonts */
  --font-display: 'Instrument Serif', 'Georgia', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
}

/* ===================================================
   DARK MODE (Default) — warm charcoal + amber
   =================================================== */
:root,
[data-theme='dark'] {
  --color-bg: #0e0e0c;
  --color-surface: #16150f;
  --color-surface-2: #1c1b13;
  --color-surface-3: #24221a;
  --color-surface-elevated: #26241b;

  --color-border: #2f2c22;
  --color-border-strong: #423e30;
  --color-divider: #24221a;

  --color-text: #f4f0e6;
  --color-text-muted: #a8a294;
  --color-text-faint: #6b6759;
  --color-text-inverse: #14130e;

  /* Primary Accent — Amber Gold */
  --color-primary: #f5b800;
  --color-primary-hover: #ffcc33;
  --color-primary-active: #d9a300;
  --color-primary-highlight: #3a2e0c;
  --color-primary-glow: rgba(245, 184, 0, 0.15);

  --color-success: #6daa45;
  --color-error: #d16155;
  --color-warning: #d19a35;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
  --shadow-primary: 0 20px 60px -20px rgba(245, 184, 0, 0.35);
}

/* ===================================================
   LIGHT MODE — warm cream + deep amber
   =================================================== */
[data-theme='light'] {
  --color-bg: #f9f5ec;
  --color-surface: #fdfaf3;
  --color-surface-2: #f4efe3;
  --color-surface-3: #ede7d6;
  --color-surface-elevated: #ffffff;

  --color-border: #dcd4bf;
  --color-border-strong: #b8ad8d;
  --color-divider: #ebe4d0;

  --color-text: #1a1810;
  --color-text-muted: #5f5947;
  --color-text-faint: #a09982;
  --color-text-inverse: #fdfaf3;

  --color-primary: #b57e00;
  --color-primary-hover: #935f00;
  --color-primary-active: #764c00;
  --color-primary-highlight: #f6ecc8;
  --color-primary-glow: rgba(181, 126, 0, 0.12);

  --color-success: #437a22;
  --color-error: #a1382e;
  --color-warning: #964219;

  --shadow-sm: 0 1px 2px rgba(70, 55, 20, 0.06);
  --shadow-md: 0 8px 24px rgba(70, 55, 20, 0.1);
  --shadow-lg: 0 24px 60px rgba(70, 55, 20, 0.16);
  --shadow-primary: 0 16px 40px -12px rgba(181, 126, 0, 0.35);
}

/* ===================================================
   BASE RESETS
   =================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

img,
picture,
video,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul,
ol {
  list-style: none;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 em,
h2 em,
h3 em {
  font-style: italic;
  color: var(--color-primary);
}

p {
  text-wrap: pretty;
  max-width: 68ch;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

::selection {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-10));
}

.container-narrow {
  max-width: var(--content-narrow);
}

a,
button,
[role='button'],
input,
textarea,
select {
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    transform var(--transition-interactive),
    box-shadow var(--transition-interactive);
}