/* ============================================================
   RUH PRODUCTIONS — Core Styles
   ============================================================ */

/* ---- Skip Link ---- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: var(--z-overlay);
  padding: var(--space-sm) var(--space-md);
  background: var(--gradient-brand);
  color: #fff;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  border-radius: var(--radius-md);
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-md);
}

/* ---- Theme Transition (targeted selectors) ---- */
body,
.nav,
.section,
.section--alt,
.about__pillar,
.capability-card,
.vision__principle,
.contact__btn,
.hero__cta,
.theme-toggle,
.footer {
  transition:
    background-color var(--duration-theme) var(--ease-out),
    color var(--duration-theme) var(--ease-out),
    border-color var(--duration-theme) var(--ease-out),
    box-shadow var(--duration-theme) var(--ease-out);
}

/* ---- Base ---- */
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--fs-base);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

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

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(var(--space-xl), env(safe-area-inset-right)) 0 max(var(--space-xl), env(safe-area-inset-left));
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-primary);
}

.nav__logo {
  height: 44px;
  width: auto;
}

.nav__logo svg {
  height: 100%;
  width: auto;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: var(--tracking-wide);
  transition: color var(--duration-normal) var(--ease-out);
}

.nav__links a:hover,
.nav__links a:focus-visible {
  color: var(--text-primary);
}

.nav__links a:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---- Hamburger (mobile only) ---- */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-normal) var(--ease-out);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Theme Toggle ---- */
.theme-toggle {
  position: relative;
  width: 48px;
  height: 26px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-secondary);
  cursor: pointer;
  transition: background var(--duration-normal) var(--ease-out),
              border-color var(--duration-theme) var(--ease-out);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: var(--accent-blue);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
}

.theme-toggle__indicator {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--gradient-brand);
  transition: transform var(--duration-normal) var(--ease-out);
}

[data-theme="light"] .theme-toggle__indicator {
  transform: translateX(22px);
}

.theme-toggle__icon {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  opacity: 0.5;
}

.theme-toggle__icon--moon { left: 6px; }
.theme-toggle__icon--sun { right: 6px; }

/* ---- Hero Section ---- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--nav-height) var(--space-xl) var(--space-4xl);
  overflow: hidden;
  scroll-margin-top: var(--nav-height);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: var(--z-bg);
  background: var(--gradient-hero);
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: var(--z-bg);
  background-image:
    linear-gradient(var(--border-primary) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-primary) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 50%, black 20%, transparent 70%);
  mask-image: radial-gradient(ellipse at 50% 50%, black 20%, transparent 70%);
}

.hero__content {
  position: relative;
  max-width: 720px;
}

.hero__logo {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-2xl);
}

.hero__title {
  font-size: var(--fs-hero);
  font-weight: var(--fw-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-lg);
}

.hero__title-accent {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__subtitle {
  font-size: var(--fs-lg);
  font-weight: var(--fw-regular);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 560px;
  margin: 0 auto var(--space-2xl);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  background: var(--gradient-brand);
  color: #fff;
  font-weight: var(--fw-medium);
  font-size: var(--fs-sm);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: var(--radius-full);
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-glow);
}

.hero__cta:hover,
.hero__cta:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.3), var(--shadow-glow);
}

.hero__cta:focus-visible {
  outline: 2px solid var(--accent-blue-bright);
  outline-offset: 3px;
}

.hero__cta:active {
  transform: translateY(0);
}

/* ---- Section Base ---- */
.section {
  padding: var(--space-section) 0;
  position: relative;
  scroll-margin-top: var(--nav-height);
}

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

.section__label {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: var(--space-md);
}

.section__title {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-lg);
}

.section__text {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 640px;
}

/* ---- About Section ---- */
.about {
  text-align: center;
}

.about .section__text {
  margin: 0 auto;
}

.about__pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.about__pillar {
  padding: var(--space-xl);
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out),
              background-color var(--duration-theme) var(--ease-out),
              color var(--duration-theme) var(--ease-out);
}

.about__pillar:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.about__pillar-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glow-primary);
  border-radius: var(--radius-md);
}

.about__pillar-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--accent-blue);
}

.about__pillar-title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.about__pillar-desc {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  line-height: var(--leading-normal);
}

/* ---- Capabilities Section ---- */
.capabilities__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.capabilities__grid .capability-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  max-width: calc(50% - var(--space-xl) / 2);
  justify-self: center;
}

.capability-card {
  padding: var(--space-2xl);
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out),
              background-color var(--duration-theme) var(--ease-out),
              color var(--duration-theme) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.capability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.capability-card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
}

.capability-card:hover::before {
  opacity: 1;
}

.capability-card__title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-sm);
}

.capability-card__desc {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* ---- Vision Section ---- */
.vision {
  text-align: center;
}

.vision .section__text {
  margin: 0 auto var(--space-3xl);
}

.vision__principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.vision__principle {
  padding: var(--space-xl) var(--space-lg);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  letter-spacing: var(--tracking-wide);
  transition: border-color var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out),
              background var(--duration-normal) var(--ease-out);
}

.vision__principle:hover {
  border-color: var(--border-accent);
  color: var(--text-primary);
  background: var(--glow-primary);
}

/* ---- Contact Section ---- */
.contact {
  text-align: center;
}

.contact .section__text {
  margin: 0 auto var(--space-2xl);
}

.contact__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  border: 1px solid var(--border-accent);
  color: var(--accent-blue);
  font-weight: var(--fw-medium);
  font-size: var(--fs-sm);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: var(--radius-full);
  transition: background var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out),
              border-color var(--duration-theme) var(--ease-out);
}

.contact__btn:hover,
.contact__btn:focus-visible {
  background: var(--accent-blue);
  color: #fff;
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.contact__btn:focus-visible {
  outline: 2px solid var(--accent-blue-bright);
  outline-offset: 3px;
}

/* ---- Footer ---- */
.footer {
  padding: var(--space-2xl) 0;
  padding-bottom: max(var(--space-2xl), env(safe-area-inset-bottom));
  border-top: 1px solid var(--border-primary);
  text-align: center;
}

.footer__text {
  font-size: var(--fs-xs);
  color: var(--text-muted);
  letter-spacing: var(--tracking-wide);
}

/* ---- Animations (Reveal on Scroll) ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--delay-1 { transition-delay: 80ms; }
.reveal--delay-2 { transition-delay: 160ms; }
.reveal--delay-3 { transition-delay: 240ms; }
.reveal--delay-4 { transition-delay: 320ms; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .nav {
    padding: 0 var(--space-lg);
  }

  .nav__hamburger {
    display: flex;
    order: 1;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-primary);
    padding: var(--space-lg);
    gap: var(--space-md);
  }

  .nav__links--open {
    display: flex;
  }

  .theme-toggle {
    order: 2;
  }

  .hero {
    padding: var(--nav-height) var(--space-lg) var(--space-3xl);
  }

  .section__title {
    font-size: var(--fs-3xl);
  }

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

  .capabilities__grid .capability-card:last-child:nth-child(odd) {
    max-width: none;
    grid-column: auto;
  }

  .hero__logo {
    width: 64px;
    height: 64px;
  }
}

@media (max-width: 480px) {
  .hero__subtitle {
    font-size: var(--fs-base);
  }

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

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

@media (max-width: 400px) {
  .about__pillars {
    grid-template-columns: 1fr;
  }
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---- Print ---- */
@media print {
  .nav,
  .hero__bg,
  .hero__grid,
  .hero__logo,
  .theme-toggle,
  .skip-link,
  .nav__hamburger {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .hero {
    min-height: auto;
    padding: var(--space-xl);
  }

  .section {
    padding: var(--space-xl) 0;
    break-inside: avoid;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .hero__cta {
    display: none !important;
  }

  .contact__btn {
    border: none;
    padding: 0;
    color: #000;
    text-transform: none;
  }

  .section--alt {
    background: none;
  }

  .capability-card::before {
    display: none;
  }

  a[href^="mailto:"]::after {
    content: " (" attr(href) ")";
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
  }
}