/* ============================================================
   GLOBAL STYLES - Modern, Clean, Forward-Thinking
   ============================================================ */

/* ============================================================
   RESET & BASE
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1.5rem);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-base);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Subtle noise texture for depth */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 250;
  pointer-events: none;
  opacity: 0.025;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@media (prefers-color-scheme: dark) {
  body::before {
    opacity: 0.015;
    mix-blend-mode: screen;
  }
}

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

a {
  color: inherit;
  text-decoration-color: var(--accent);
}

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

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

/* ============================================================
   TYPOGRAPHY - Clean hierarchy, no serif
   ============================================================ */

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.025em;
  text-wrap: balance;
  color: var(--text-primary);
}

h1 {
  font-size: var(--step-5);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

h2 {
  font-size: var(--step-4);
  line-height: 1.08;
}

h3 {
  font-size: var(--step-2);
  font-weight: 600;
}

p {
  max-width: 65ch;
  color: var(--text-secondary);
}

em {
  font-style: italic;
  color: var(--accent);
}

strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* ============================================================
   SELECTION & FOCUS
   ============================================================ */

::selection {
  background: var(--accent);
  color: var(--text-on-accent);
}

@media (prefers-color-scheme: dark) {
  ::selection {
    background: var(--accent);
    color: var(--text-on-accent);
  }
}

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

/* ============================================================
   DARK SECTIONS - For sections with dark backgrounds
   ============================================================ */

.on-dark,
.page-cta,
.authority-strip {
  --accent: var(--blue-300);
  --accent-hover: var(--blue-200);
  --accent-light: var(--blue-900);
  --text-on-accent: var(--grey-900);
}

.on-dark {
  background: var(--dark-surface);
  color: var(--text-on-dark);
}

.on-dark p {
  color: var(--text-on-dark-soft);
}

.on-dark h1,
.on-dark h2,
.on-dark h3,
.on-dark h4,
.on-dark h5,
.on-dark h6 {
  color: var(--text-on-dark);
}

.on-dark em {
  color: var(--accent);
}

.on-dark strong {
  color: var(--text-on-dark);
}

/* Dark mode: .on-dark sections need contrast against dark body */
@media (prefers-color-scheme: dark) {
  .on-dark {
    background: var(--dark-surface-raised);
  }
}

/* ============================================================
   SCROLLBAR
   ============================================================ */

html {
  scrollbar-color: var(--accent) var(--surface-2);
  scrollbar-width: thin;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--surface-2);
}

::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-hover);
}

/* ============================================================
   LAYOUT UTILITIES
   ============================================================ */

.container {
  width: min(var(--max-width), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-7);
}

.section--tight {
  padding-block: var(--space-6);
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  z-index: 200;
  background: var(--action-bg);
  color: var(--action-fg);
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
  transition: top var(--dur) var(--ease-out);
}

.skip-link:focus {
  top: 1rem;
}

/* ============================================================
   SECTION HEADERS - No eyebrow overuse (max 1 per 3 sections)
   ============================================================ */

.section-head {
  margin-bottom: var(--space-5);
}

.section-head h2 {
  font-size: var(--step-4);
  max-width: 20ch;
}

/* Only ONE section gets an eyebrow - use sparingly */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.eyebrow::before {
  content: "";
  width: 2rem;
  height: 1px;
  background: currentColor;
}

/* ============================================================
   BUTTONS - Clean, modern, accessible
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 48px;
  padding: 0.85rem 1.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  border: 1.5px solid currentColor;
  border-radius: 6px;
  cursor: pointer;
  touch-action: manipulation;
  transition:
    background var(--dur) var(--ease-out),
    color var(--dur) var(--ease-out),
    transform var(--dur-fast) var(--ease-out),
    border-color var(--dur) var(--ease-out),
    box-shadow var(--dur) var(--ease-out);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.btn:active {
  transform: translateY(1px);
}

.btn .arrow {
  transition: transform var(--dur) var(--ease-out);
}

.btn:hover .arrow {
  transform: translateX(4px);
}

/* Solid button */
.btn--solid {
  background: var(--action-bg);
  color: var(--action-fg);
  border-color: var(--action-bg);
}

.btn--solid:hover {
  background: var(--action-hover-bg);
  color: var(--action-hover-fg);
  border-color: var(--action-hover-bg);
  box-shadow: var(--shadow-accent);
  transform: translateY(-2px);
}

/* Ghost button */
.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  background: var(--action-bg);
  color: var(--action-fg);
  border-color: var(--action-bg);
}

/* ============================================================
   INLINE LINKS
   ============================================================ */

.inline-link {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.2em;
  font-weight: 600;
  transition: color var(--dur) var(--ease-out);
}

.inline-link:hover {
  color: var(--accent-hover);
}

/* ============================================================
   REVEAL ANIMATIONS - Staggered entrance (MOTION: 5)
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Delay variants for stagger */
.reveal-delay-80 {
  --reveal-delay: 80ms;
}

.reveal-delay-90 {
  --reveal-delay: 90ms;
}

.reveal-delay-100 {
  --reveal-delay: 100ms;
}

.reveal-delay-140 {
  --reveal-delay: 140ms;
}

.reveal-delay-180 {
  --reveal-delay: 180ms;
}

.reveal-delay-200 {
  --reveal-delay: 200ms;
}

.reveal-delay-260 {
  --reveal-delay: 260ms;
}

.reveal-delay-270 {
  --reveal-delay: 270ms;
}

.reveal-delay-320 {
  --reveal-delay: 320ms;
}

.reveal-delay-380 {
  --reveal-delay: 380ms;
}

.reveal-delay-440 {
  --reveal-delay: 440ms;
}

.reveal-delay-500 {
  --reveal-delay: 500ms;
}

/* Spinner animation for loading states */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }

  .spinner {
    animation: none !important;
  }
}

/* ============================================================
   MOBILE UTILITIES
   ============================================================ */

@media (max-width: 768px) {
  h1 {
    font-size: var(--step-4);
  }

  h2 {
    font-size: var(--step-3);
  }

  .section {
    padding-block: var(--space-6);
  }

  .section--tight {
    padding-block: var(--space-5);
  }
}

/* ============================================================
   DARK MODE - Hardcoded background fallbacks
   Ensures dark backgrounds apply even if CSS custom-property
   resolution fails in some browsers.  Hex values mirror the
   tokens in variables-new.css (grey-900, grey-800, grey-700).
   ============================================================ */

@media (prefers-color-scheme: dark) {
  body {
    background-color: #0f172a; /* grey-900 */
    color: #f8fafc;            /* grey-50  */
  }

  .site-header {
    background: rgba(15, 23, 42, 0.9); /* grey-900 @ 90% */
  }

  .on-dark {
    background-color: #1e293b; /* grey-800 — raised dark surface */
  }

  .page-hero,
  .content-section--tint,
  .boards {
    background-color: #1e293b; /* grey-800 — surface-2 */
  }

  .site-nav {
    background-color: #0f172a; /* grey-900 — mobile dropdown */
  }

  .page-cta,
  .authority-strip {
    background-color: #1e293b; /* grey-800 */
  }
}