/*
 * OphieAI — Global Styles
 * Body, nav, footer, layout containers, grain overlay, reveal animations.
 */

@import "./fonts.css";
@import "./tokens.css";
@import "./reset.css";

/* ============================================
   BASE
   ============================================ */

html {
  background-color: var(--color-bg);
}

body {
  background-color: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-base);
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* ============================================
   GRAIN OVERLAY (paper/film grain texture)
   ============================================ */

.grain-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* ============================================
   LAYOUT CONTAINERS
   ============================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-8);
}

.container--narrow {
  max-width: var(--content-width);
}

.section {
  padding-block: var(--space-3xl);
}

.section--lg {
  padding-block: calc(var(--space-3xl) * 1.5);
}

.section--sm {
  padding-block: var(--space-2xl);
}

/* ============================================
   SKIP LINK (Accessibility)
   ============================================ */

.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10000;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-accent);
  color: white;
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  transition: top var(--dur-base) var(--ease-out);
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   SITE HEADER & NAV
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: oklch(100% 0 0 / 0.02);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid oklch(100% 0 0 / 0.03);
  transition:
    background 500ms var(--ease-out),
    backdrop-filter 500ms var(--ease-out),
    border-color 500ms var(--ease-out);
}

.site-header.is-scrolled {
  background: oklch(100% 0 0 / 0.05);
  backdrop-filter: blur(22px) saturate(1.8);
  -webkit-backdrop-filter: blur(22px) saturate(1.8);
  border-bottom-color: oklch(100% 0 0 / 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-8);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo-img {
  display: block;
  height: 28px;
  width: auto;
}

/* Legacy text logo — preserved for any page that still uses it */
.site-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  color: var(--color-ink);
  line-height: 1;
}

/* Nav links */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: var(--tracking-normal);
  border-radius: var(--radius-sm);
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}

.nav-link:hover {
  color: var(--color-ink);
  background: var(--color-surface);
}

.nav-link.is-active {
  color: var(--color-ink);
}

/* Nav CTA */
.nav-cta {
  margin-left: var(--space-4);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

/* Tighter glass buttons for the nav */
.nav-cta .btn-glass {
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-ink);
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast);
}

.nav-toggle:hover {
  background: var(--color-surface);
}

.nav-toggle-bar {
  width: 20px;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur-base) var(--ease-out),
              opacity var(--dur-base) var(--ease-out);
  transform-origin: center;
}

.nav-open .nav-toggle .nav-toggle-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-open .nav-toggle .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-open .nav-toggle .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-8);
}

.footer-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.footer-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--dur-fast);
}

.footer-link:hover {
  color: var(--color-ink);
}

.footer-sep {
  color: var(--color-border);
  user-select: none;
}

.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

/* ============================================
   SCROLL REVEAL ANIMATIONS
   ============================================ */

/* Only hide for reveal animation when JS has loaded.
   Default state is visible — protects SEO crawlers, screenshot tools,
   and users with JS disabled. */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--dur-reveal) var(--ease-out),
    transform var(--dur-reveal) var(--ease-out);
}

.js [data-reveal="fade"] {
  transform: none;
}

.js [data-reveal="left"] {
  transform: translateX(-24px);
}

.js [data-reveal="right"] {
  transform: translateX(24px);
}

.js [data-reveal="scale"] {
  transform: scale(0.96);
}

.js [data-reveal].revealed {
  opacity: 1;
  transform: none;
}

/* Stagger delays */
[data-reveal-delay="1"] { transition-delay: 100ms; }
[data-reveal-delay="2"] { transition-delay: 200ms; }
[data-reveal-delay="3"] { transition-delay: 300ms; }
[data-reveal-delay="4"] { transition-delay: 400ms; }
[data-reveal-delay="5"] { transition-delay: 500ms; }
[data-reveal-delay="6"] { transition-delay: 600ms; }
[data-reveal-delay="7"] { transition-delay: 700ms; }
[data-reveal-delay="8"] { transition-delay: 800ms; }

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    transform: none;
    transition: opacity var(--dur-base) var(--ease-out);
  }
}

/* ============================================
   TYPOGRAPHY UTILITIES
   ============================================ */

.display {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.lead {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-muted);
}

/* ============================================
   DIVIDERS
   ============================================ */

.divider {
  border: none;
  border-top: 1px solid var(--color-border);
}

/* ============================================
   SECTION HEADING PATTERN
   ============================================ */

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-header .eyebrow {
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-ink);
}

.section-body {
  margin-top: var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-muted);
  max-width: 60ch;
}

/* ============================================
   PAGE HEADER (below fixed nav)
   ============================================ */

.page-offset {
  padding-top: var(--nav-height);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1100px) {
  .container {
    padding-inline: var(--space-6);
  }
  .header-inner,
  .footer-inner {
    padding-inline: var(--space-6);
  }
}

@media (max-width: 768px) {
  .container {
    padding-inline: var(--space-4);
  }
  .header-inner,
  .footer-inner {
    padding-inline: var(--space-4);
  }

  .section {
    padding-block: var(--space-2xl);
  }

  .section--lg {
    padding-block: var(--space-3xl);
  }

  /* Mobile nav */
  .site-nav {
    display: none;
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6) var(--space-4);
    gap: var(--space-1);
    border-top: 1px solid var(--color-border);
    overflow-y: auto;
  }

  .site-nav.is-open {
    display: flex;
  }

  .nav-link {
    font-size: var(--text-base);
    padding: var(--space-3) var(--space-4);
    width: 100%;
  }

  .nav-cta {
    margin-left: 0;
    margin-top: var(--space-4);
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }

  .nav-cta .btn,
  .nav-cta .btn-glass {
    width: 100%;
    justify-content: center;
  }

  .nav-toggle {
    display: flex;
    min-width: 44px;
    min-height: 44px;
  }

  /* Bump site-logo tap area to 44px on mobile while keeping image visual size unchanged. */
  .site-logo {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }

  .footer-copy {
    width: 100%;
  }

  /* Section titles */
  .section-title {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 480px) {
  .section {
    padding-block: var(--space-xl);
  }
}