/* ==========================================================================
   GLOBAL STYLES
   Import order: tokens.css → global.css → component CSSes → page stylesheet
   ========================================================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Playfair+Display:ital,wght@0,700;1,700&display=swap');

/* Design tokens */
@import './tokens.css';

/* -------------------------------------------------------------------
   CSS Reset (modern, minimal)
------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-hover);
}

ul,
ol {
  list-style: none;
}

/* -------------------------------------------------------------------
   Layout helpers
------------------------------------------------------------------- */

/* Constrained content wrapper — universally used inside sections */
.container {
  width: 100%;
  max-width: var(--max-content-width);
  margin-inline: auto;
  padding-inline: var(--spacing-4);
}

@media (max-width: 768px) {
  .container {
    padding-inline: var(--spacing-3);
  }
}

/* Section rhythm wrapper — vertical padding only */
.section {
  padding-block: var(--section-padding-y);
}

@media (max-width: 768px) {
  .section {
    padding-block: var(--section-padding-y-mobile);
  }
}

/* Background variants */
.section--alt  { background-color: var(--color-bg-alt); }
.section--dark { background-color: var(--color-bg-dark); color: #fff; }

/* -------------------------------------------------------------------
   Typography — base element styles
------------------------------------------------------------------- */

h1 {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
}

h2 {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: var(--weight-bold);
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
}

h3 {
  font-family: var(--font-primary);
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
  color: var(--color-text-primary);
}

p {
  color: var(--color-text-muted);
  line-height: var(--leading-loose);
  max-width: 65ch;
}

/* Section label — "01 THE PROBLEM", "02 OUR SOLUTION" etc */
.section-label {
  font-family: var(--font-primary);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-label);
  margin-bottom: var(--spacing-3);
  display: block;
}

/* -------------------------------------------------------------------
   CTA Button — primary action style
------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-1);
  font-family: var(--font-primary);
  font-size: 0.9375rem;
  font-weight: var(--weight-medium);
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: var(--transition-base);
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Primary: teal on white text */
.btn--primary {
  background-color: var(--color-accent);
  color: #ffffff;
  padding: 12px 24px;
}

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
}

.btn--primary:active {
  transform: scale(0.98);
}

/* Secondary: white bg, teal text (for dark sections) */
.btn--secondary {
  background-color: #ffffff;
  color: var(--color-accent);
  padding: 12px 24px;
}

.btn--secondary:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-accent-hover);
}

/* -------------------------------------------------------------------
   Scroll-reveal
   JS adds .is-visible; CSS drives the transition
------------------------------------------------------------------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(var(--reveal-translate));
  transition: var(--transition-reveal);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Stagger for children */
[data-reveal-stagger] > * {
  opacity: 0;
  transform: translateY(var(--reveal-translate));
  transition: var(--transition-reveal);
}

[data-reveal-stagger].is-visible > *:nth-child(1) { transition-delay: 0ms; }
[data-reveal-stagger].is-visible > *:nth-child(2) { transition-delay: 100ms; }
[data-reveal-stagger].is-visible > *:nth-child(3) { transition-delay: 200ms; }
[data-reveal-stagger].is-visible > *:nth-child(4) { transition-delay: 300ms; }
[data-reveal-stagger].is-visible > * { opacity: 1; transform: translateY(0); }

/* -------------------------------------------------------------------
   Visually-hidden (a11y) utility
------------------------------------------------------------------- */

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

/* -------------------------------------------------------------------
   Skip-to-content link (a11y)
------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -9999px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #fff;
  padding: var(--spacing-2) var(--spacing-4);
  z-index: var(--z-modal);
  border-radius: var(--radius-button);
  text-decoration: none;
  font-family: var(--font-primary);
  font-size: var(--text-base);
}

.skip-link:focus {
  top: var(--spacing-2);
}

/* -------------------------------------------------------------------
   Body padding to clear sticky banner + nav
------------------------------------------------------------------- */

body.has-banner {
  padding-top: var(--nav-total-height);
}

body:not(.has-banner) {
  padding-top: var(--nav-height);
}