/* ==========================================================================
   kevshannon.co — design tokens & base styles
   The foundation layer of the visual system. Load this before styles.css.
   Documented in full in STYLE_GUIDE.md.
   ========================================================================== */

:root {
  /* ---- Colour ---- */
  --color-navy: #0a2540; /* display titles, strong headings */
  --color-ink: #14212e; /* body text */
  --color-slate: #5b6b7a; /* secondary text, tags, meta */
  --color-blue: #2563eb; /* links, accents, highlights */
  --color-blue-strong: #1d4ed8; /* button backgrounds/hovers (AA on white) */
  --color-blue-tint: #eaf1fb; /* section tints, card fills */
  --color-white: #ffffff; /* default background */
  --color-offwhite: #f6f9fd; /* alternating section background */
  --color-hairline: #dce5ef; /* borders, rules */

  /* ---- Type ---- */
  --font-display: "Playfair Display", Georgia, "Times New Roman", serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --text-hero: clamp(2rem, 1.3rem + 3vw, 3.5rem);
  --text-h2: clamp(1.5rem, 1.2rem + 1.4vw, 2.25rem);
  --text-h3: clamp(1.125rem, 1.02rem + 0.5vw, 1.375rem);
  --text-lead: clamp(1.0625rem, 1rem + 0.3vw, 1.1875rem);
  --text-body: 1rem;
  --text-small: 0.875rem;
  --text-eyebrow: 0.75rem;

  /* ---- Spacing (4px base) ---- */
  --space-1: 0.25rem; /* 4px */
  --space-2: 0.5rem; /* 8px */
  --space-3: 0.75rem; /* 12px */
  --space-4: 1rem; /* 16px */
  --space-5: 1.25rem; /* 20px */
  --space-6: 1.5rem; /* 24px */
  --space-7: 2rem; /* 32px */
  --space-8: 2.5rem; /* 40px */
  --space-9: 3rem; /* 48px */
  --space-10: 4rem; /* 64px */
  --space-section: clamp(3.5rem, 2.6rem + 4.5vw, 7rem); /* fluid section rhythm */

  /* ---- Layout ---- */
  --container-max: 1160px;
  --radius-sm: 0.5rem;
  --radius-lg: 0.75rem;

  /* ---- Motion ---- */
  --ease: cubic-bezier(0.2, 0.65, 0.2, 1);
  --duration: 0.25s;
}

/* ==========================================================================
   Typography base
   Playfair is titles-only (h1–h3). Everything else stays in Inter — never
   set long body copy in Playfair.
   ========================================================================== */

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-navy);
}

/* Escape hatch: drop a heading back to Inter if Playfair reads too delicate
   at small sizes (e.g. a tracked-out uppercase h3 used as a label). */
.title--sans {
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0;
}

/* ==========================================================================
   Labels
   ========================================================================== */

.eyebrow {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-eyebrow);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-blue);
}

.tag {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-eyebrow);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-slate);
}

/* ==========================================================================
   Links
   ========================================================================== */

a {
  color: var(--color-blue);
  text-decoration: none;
  transition: color var(--duration) var(--ease);
}

a:hover {
  color: var(--color-blue-strong);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-body);
  text-decoration: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  background: var(--color-blue-strong);
  color: var(--color-white);
  transition: background-color var(--duration) var(--ease),
    color var(--duration) var(--ease), transform var(--duration) var(--ease),
    box-shadow var(--duration) var(--ease);
}

.btn:hover {
  background: var(--color-navy);
  color: var(--color-white);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -10px rgba(10, 37, 64, 0.45);
}

.btn-ghost {
  background: transparent;
  color: var(--color-blue-strong);
  border-color: var(--color-hairline);
}

.btn-ghost:hover {
  background: var(--color-blue-tint);
  border-color: var(--color-blue);
  color: var(--color-blue-strong);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: none;
}

/* ==========================================================================
   Layout primitives
   ========================================================================== */

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 640px) {
  .container {
    padding-inline: var(--space-7);
  }
}

@media (min-width: 1200px) {
  .container {
    padding-inline: var(--space-8);
  }
}

.section {
  padding-block: var(--space-section);
  background: var(--color-white);
}

.section--alt {
  background: var(--color-offwhite);
}

/* ==========================================================================
   Card
   ========================================================================== */

.card {
  background: var(--color-white);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  transition: transform var(--duration) var(--ease),
    box-shadow var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-blue);
  box-shadow: 0 16px 28px -18px rgba(37, 99, 235, 0.3);
}

/* ==========================================================================
   Rule
   ========================================================================== */

.rule {
  border: none;
  border-top: 1px solid var(--color-hairline);
  margin: 0;
}

/* ==========================================================================
   Reduced motion
   Disables every transition, transform and scroll-behaviour this file
   defines. Page-specific motion (styles.css) carries its own equivalent
   block for anything not covered here.
   ========================================================================== */

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  a,
  .btn,
  .btn-ghost,
  .card {
    transition-duration: 0.01ms !important;
  }

  .btn:hover,
  .btn-ghost:hover,
  .card:hover {
    transform: none !important;
  }
}