/* ============================================================
   Racture.com — styles.css
   Edit this file to customise colours, spacing, and layout.
   ============================================================ */

/* ---------- Custom Properties (Light theme default) ---------- */
:root {
  /* Colours */
  --color-bg:          #ffffff;
  --color-bg-alt:      #f5f5f7;
  --color-surface:     #ffffff;
  --color-text:        #1d1d1f;
  --color-text-muted:  #6e6e73;
  --color-accent:      #0071e3;
  --color-accent-hover:#005bb5;
  --color-border:      #d2d2d7;
  --color-nav-bg:      rgba(255, 255, 255, 0.82);
  --color-cta-bg:      #0071e3;
  --color-cta-text:    #ffffff;

  /* Typography */
  --font-sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono:  "Menlo", "Monaco", "Courier New", monospace;
  --fs-xs:      0.8125rem;
  --fs-sm:      0.9375rem;
  --fs-base:    1rem;
  --fs-md:      1.25rem;
  --fs-lg:      1.75rem;
  --fs-xl:      2.5rem;
  --fs-xxl:     3.25rem;

  /* Spacing */
  --space-xs:   0.5rem;
  --space-sm:   1rem;
  --space-md:   1.5rem;
  --space-lg:   2.5rem;
  --space-xl:   4rem;
  --space-xxl:  6rem;

  /* Layout */
  --max-width:  1080px;
  --nav-height: 56px;
  --radius:     12px;
  --radius-sm:  8px;

  /* Transitions */
  --transition: 0.25s ease;
}

/* ---------- Dark theme ---------- */
[data-theme="dark"] {
  --color-bg:          #0d0d0d;
  --color-bg-alt:      #1a1a1a;
  --color-surface:     #1c1c1e;
  --color-text:        #f5f5f7;
  --color-text-muted:  #a1a1a6;
  --color-accent:      #2997ff;
  --color-accent-hover:#52a9ff;
  --color-border:      #38383a;
  --color-nav-bg:      rgba(13, 13, 13, 0.85);
  --color-cta-bg:      #2997ff;
  --color-cta-text:    #0d0d0d;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul {
  list-style: none;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

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

/* ---------- Skip Link ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  z-index: 1000;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--transition);
}

.skip-link:focus {
  top: var(--space-sm);
  color: #fff;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), border-color var(--transition);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav__logo-img {
  height: 22px;
  width: auto;
}

/* Show / hide logos by theme */
.nav__logo-img--dark { display: none; }
[data-theme="dark"] .nav__logo-img--light { display: none; }
[data-theme="dark"] .nav__logo-img--dark  { display: block; }

/* Mobile toggle */
.nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__toggle-icon,
.nav__toggle-icon::before,
.nav__toggle-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle-icon {
  position: relative;
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav__toggle-icon::before { transform: translateY(-7px); }
.nav__toggle-icon::after  { transform: translateY(7px); }

/* X state */
.nav__toggle[aria-expanded="true"] .nav__toggle-icon { background: transparent; }
.nav__toggle[aria-expanded="true"] .nav__toggle-icon::before { transform: rotate(45deg); }
.nav__toggle[aria-expanded="true"] .nav__toggle-icon::after  { transform: rotate(-45deg); }

/* Menu */
.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__list {
  display: flex;
  gap: var(--space-md);
}

.nav__link {
  color: var(--color-text);
  font-size: var(--fs-sm);
  font-weight: 500;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition);
}

.nav__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link[aria-current="true"] {
  color: var(--color-accent);
}

.nav__link:hover::after,
.nav__link[aria-current="true"]::after {
  width: 100%;
}

/* Theme toggle button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  cursor: pointer;
  padding: 0;
  transition: border-color var(--transition), background var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--color-bg-alt);
}

.theme-toggle__icon {
  position: absolute;
  width: 18px;
  height: 18px;
  color: var(--color-text);
  transition: opacity var(--transition);
}

.theme-toggle__icon--sun { opacity: 0; }
.theme-toggle__icon--moon { opacity: 1; }

[data-theme="dark"] .theme-toggle__icon--sun { opacity: 1; }
[data-theme="dark"] .theme-toggle__icon--moon { opacity: 0; }

/* ---------- Hero ---------- */
.hero {
  padding-top: calc(var(--nav-height) + var(--space-xxl));
  padding-bottom: var(--space-xxl);
  text-align: center;
}

.hero h1 {
  font-size: var(--fs-xxl);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.hero__subtitle {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto var(--space-lg);
  line-height: 1.5;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: 980px;
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform 0.15s ease;
  text-decoration: none;
}

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

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

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

/* ---------- Sections ---------- */
.section {
  padding: var(--space-xxl) 0;
}

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

.section h2 {
  font-size: var(--fs-xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-xs);
}

.section__lead {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--fs-md);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

/* ---------- Card Grid ---------- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.card__title {
  font-size: var(--fs-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.card p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.card__list {
  padding-left: 0;
}

.card__list li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}

.card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ---------- CTA ---------- */
.cta {
  padding: var(--space-xxl) 0;
  text-align: center;
  background: var(--color-bg-alt);
}

.cta h2 {
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.cta p {
  color: var(--color-text-muted);
  font-size: var(--fs-md);
  margin-bottom: var(--space-lg);
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-lg) 0;
  text-align: center;
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   Responsive Breakpoints
   ============================================================ */

/* Tablet (max 768px) */
@media (max-width: 768px) {
  :root {
    --fs-xxl: 2.25rem;
    --fs-xl:  1.875rem;
    --fs-lg:  1.375rem;
    --space-xxl: 4rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .nav__list {
    gap: var(--space-sm);
  }
}

/* Mobile (max 540px) */
@media (max-width: 540px) {
  :root {
    --fs-xxl: 1.75rem;
    --fs-xl:  1.5rem;
    --fs-lg:  1.25rem;
    --fs-md:  1.0625rem;
    --space-xxl: 3rem;
    --space-xl: 2.5rem;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-lg);
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 99;
  }

  .nav__menu.is-open {
    transform: translateX(0);
  }

  body.menu-open main {
    filter: blur(10px);
    pointer-events: none;
    user-select: none;
    transition: filter var(--transition);
  }

  .nav__list {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }

  .nav__link {
    font-size: var(--fs-lg);
  }

  .hero {
    padding-top: calc(var(--nav-height) + var(--space-xl));
  }

  .card {
    padding: var(--space-md);
  }
}

/* Hide mobile toggle on desktop */
@media (min-width: 541px) {
  .nav__toggle {
    display: none;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- High contrast ---------- */
@media (forced-colors: active) {
  .btn--primary {
    border: 2px solid ButtonText;
  }

  .card {
    border: 2px solid CanvasText;
  }
}