/* ===== Design Tokens ===== */
:root {
  /* Type scale */
  --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(2.75rem, 0.5rem + 6.5vw, 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-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-full: 9999px;

  --transition-interactive: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 1080px;
  --content-wide: 1320px;

  /* Brand fonts */
  --font-display: 'Archivo', 'Helvetica Neue', sans-serif;
  --font-body: 'Archivo', 'Helvetica Neue', sans-serif;
}

/* ===== Light Mode ===== */
:root, [data-theme="light"] {
  --color-bg: #f4f4f3;
  --color-surface: #ffffff;
  --color-surface-2: #ebebe9;
  --color-surface-offset: #e3e3e0;
  --color-border: #d4d4d1;
  --color-divider: #dedede;

  --color-text: #16181c;
  --color-text-muted: #565a61;
  --color-text-faint: #9a9da3;
  --color-text-inverse: #f5f5f4;

  --color-brand: #d71e30;       /* X-TEK red */
  --color-brand-hover: #b8101f;
  --color-brand-active: #970a17;

  --color-steel: #1b1d22;       /* near-black steel */
  --color-steel-2: #25282e;

  --shadow-sm: 0 1px 2px rgba(20,20,22,0.08);
  --shadow-md: 0 6px 20px rgba(20,20,22,0.10);
  --shadow-lg: 0 18px 48px rgba(20,20,22,0.16);
  --hairline: rgba(20,20,22,0.10);
}

/* ===== Dark Mode ===== */
[data-theme="dark"] {
  --color-bg: #111317;
  --color-surface: #181b20;
  --color-surface-2: #1f2329;
  --color-surface-offset: #23272e;
  --color-border: #2c3138;
  --color-divider: #23272e;

  --color-text: #e8e9eb;
  --color-text-muted: #9aa0a8;
  --color-text-faint: #686d75;
  --color-text-inverse: #16181c;

  --color-brand: #ec3a4b;
  --color-brand-hover: #f0505f;
  --color-brand-active: #d71e30;

  --color-steel: #0c0d10;
  --color-steel-2: #15171c;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 6px 20px rgba(0,0,0,0.45);
  --shadow-lg: 0 18px 48px rgba(0,0,0,0.55);
  --hairline: rgba(255,255,255,0.08);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #111317; --color-surface: #181b20; --color-surface-2: #1f2329;
    --color-surface-offset: #23272e; --color-border: #2c3138; --color-divider: #23272e;
    --color-text: #e8e9eb; --color-text-muted: #9aa0a8; --color-text-faint: #686d75;
    --color-text-inverse: #16181c; --color-brand: #ec3a4b; --color-brand-hover: #f0505f;
    --color-brand-active: #d71e30; --color-steel: #0c0d10; --color-steel-2: #15171c;
    --hairline: rgba(255,255,255,0.08);
  }
}

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

html {
  -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

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[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4 { text-wrap: balance; line-height: 1.05; font-family: var(--font-display); }
p { text-wrap: pretty; }

::selection { background: var(--color-brand); color: #fff; }

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important; animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important; scroll-behavior: auto !important;
  }
}

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

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

.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;
}