/* ==========================================================================
   Emmanuel Sanni — Portfolio base + design tokens
   Concept: "Signal & Ink" — editorial, authoritative, telecoms/rail/operations
   ========================================================================== */

:root,
[data-theme='light'] {
  /* Surfaces — warm paper */
  --color-bg: #f4f1ec;
  --color-surface: #faf8f4;
  --color-surface-2: #ffffff;
  --color-surface-offset: #ece7df;
  --color-surface-offset-2: #e4ded4;
  --color-surface-dynamic: #ddd6cb;
  --color-divider: #e0dacf;
  --color-border: #d6cfc2;

  /* Text — ink */
  --color-text: #1b1a17;
  --color-text-muted: #6b6862;
  --color-text-faint: #a8a49b;
  --color-text-inverse: #f9f8f4;

  /* Primary — deep signal teal */
  --color-primary: #0e5a57;
  --color-primary-hover: #0a4744;
  --color-primary-active: #083634;
  --color-primary-highlight: #d4e3e0;

  /* Accent — warm copper (used very sparingly) */
  --color-accent: #b15c2a;
  --color-accent-highlight: #ecddcf;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-lift: 420ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 6px 18px oklch(0.2 0.01 80 / 0.09);
  --shadow-lg: 0 18px 44px oklch(0.2 0.01 80 / 0.14);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1180px;

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'General Sans', 'Helvetica Neue', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #141311;
  --color-surface: #1b1a17;
  --color-surface-2: #211f1c;
  --color-surface-offset: #1e1c19;
  --color-surface-offset-2: #26231f;
  --color-surface-dynamic: #2d2a25;
  --color-divider: #2a2825;
  --color-border: #3a3733;

  --color-text: #d6d2c9;
  --color-text-muted: #8a867e;
  --color-text-faint: #5e5b55;
  --color-text-inverse: #1b1a17;

  --color-primary: #5baea8;
  --color-primary-hover: #7fc1bb;
  --color-primary-active: #9ad1cc;
  --color-primary-highlight: #23302f;

  --color-accent: #d28a5b;
  --color-accent-highlight: #3a2a20;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.22);
  --shadow-md: 0 6px 18px oklch(0 0 0 / 0.32);
  --shadow-lg: 0 18px 44px oklch(0 0 0 / 0.42);
}

/* System preference fallback when no manual choice made */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #141311;
    --color-surface: #1b1a17;
    --color-surface-2: #211f1c;
    --color-surface-offset: #1e1c19;
    --color-surface-offset-2: #26231f;
    --color-surface-dynamic: #2d2a25;
    --color-divider: #2a2825;
    --color-border: #3a3733;
    --color-text: #d6d2c9;
    --color-text-muted: #8a867e;
    --color-text-faint: #5e5b55;
    --color-text-inverse: #1b1a17;
    --color-primary: #5baea8;
    --color-primary-hover: #7fc1bb;
    --color-primary-active: #9ad1cc;
    --color-primary-highlight: #23302f;
    --color-accent: #d28a5b;
    --color-accent-highlight: #3a2a20;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.22);
    --shadow-md: 0 6px 18px oklch(0 0 0 / 0.32);
    --shadow-lg: 0 18px 44px oklch(0 0 0 / 0.42);
  }
}

/* --- Type scale --- */
:root {
  --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, 0.5rem + 7vw, 8rem);
}

/* --- Spacing (4px base) --- */
:root {
  --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;
}

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  hanging-punctuation: first last;
  scroll-padding-top: var(--space-20);
}

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);
}

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

ul[role='list'],
ol[role='list'] {
  list-style: none;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  text-wrap: balance;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

p,
li,
figcaption {
  text-wrap: pretty;
  max-width: 72ch;
}

::selection {
  background: oklch(from var(--color-primary) l c h / 0.25);
  color: var(--color-text);
}

: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;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

table {
  border-collapse: collapse;
  width: 100%;
}

a,
button,
[role='button'],
[role='link'],
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;
}