/* ============================================================
   oneg.ai — Design System
   Intelligence, please.
   ============================================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@400;500;600;700&family=IBM+Plex+Sans:wght@300;400;500&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* --- Custom Properties --- */
:root {
  /* Palette — derived from logo */
  --bg-primary: #08080A;
  --bg-secondary: #0E0E12;
  --bg-surface: #141418;
  --bg-surface-hover: #1A1A20;

  --yellow: #E8E040;
  --yellow-dim: #C8C030;
  --yellow-glow: rgba(232, 224, 64, 0.12);
  --yellow-glow-strong: rgba(232, 224, 64, 0.25);

  --text-primary: #E8E8E8;
  --text-secondary: #909098;
  --text-dim: #606068;

  --border: rgba(232, 224, 64, 0.08);
  --border-hover: rgba(232, 224, 64, 0.18);

  /* Typography */
  --font-display: 'Chakra Petch', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 8rem;

  /* Sizes */
  --max-width: 960px;
  --header-height: 64px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 600ms;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
}

/* --- Dot Grid Background --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(
    circle at center,
    rgba(232, 224, 64, 0.035) 1px,
    transparent 1px
  );
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--text-primary);
}

h3 {
  font-size: 1rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--yellow);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

p {
  max-width: 60ch;
  color: var(--text-secondary);
}

a {
  color: var(--yellow);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--text-primary);
}

code, pre {
  font-family: var(--font-mono);
}

::selection {
  background: var(--yellow);
  color: var(--bg-primary);
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

.section {
  padding: var(--space-2xl) 0;
}

.section + .section {
  border-top: 1px solid var(--border);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  position: relative;
}

.hero__logo {
  width: min(480px, 85vw);
  height: auto;
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: fadeUp 0.8s var(--ease-out) 0.2s forwards;
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeUp 0.8s var(--ease-out) 0.5s forwards;
}

.hero__tagline em {
  font-style: normal;
  color: var(--yellow);
}

.hero__description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 48ch;
  text-align: center;
  line-height: 1.7;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease-out) 0.8s forwards;
}

.hero__scroll-hint {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeIn 0.8s var(--ease-out) 1.4s forwards;
}

.hero__scroll-hint::after {
  content: '';
  width: 1px;
  height: 32px;
  background: linear-gradient(to bottom, var(--text-dim), transparent);
  animation: pulse 2s ease-in-out infinite;
}

/* --- Domains Section --- */
.domains {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

@media (min-width: 640px) {
  .domains {
    grid-template-columns: 1fr 1fr;
  }
}

.domain-card {
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--bg-surface);
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.domain-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--yellow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-normal) var(--ease-out);
}

.domain-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-surface-hover);
}

.domain-card:hover::before {
  transform: scaleX(1);
}

.domain-card__arrow {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color var(--duration-normal) var(--ease-out);
}

.domain-card:hover .domain-card__arrow {
  color: var(--yellow);
}

.domain-card__label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: var(--space-sm);
}

.domain-card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.domain-card__text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Approach Section --- */
.approach__text {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 64ch;
}

.approach__text strong {
  color: var(--text-primary);
  font-weight: 500;
}

.approach__text .accent {
  color: var(--yellow);
}

/* --- Section Header --- */
.section-header {
  margin-bottom: var(--space-xl);
}

.section-header__label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: var(--space-sm);
  display: block;
}

.section-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  color: var(--text-primary);
}

/* --- Footer --- */
.footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

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

.footer__icon {
  width: 32px;
  height: auto;
  opacity: 0.6;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.footer__icon:hover {
  opacity: 1;
}

.footer__copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__link:hover {
  color: var(--yellow);
}

.footer__link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* --- Coming Soon Page --- */
.coming-soon {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
}

.coming-soon__icon {
  width: 64px;
  margin-bottom: var(--space-lg);
  opacity: 0.4;
}

.coming-soon__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.coming-soon__text {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.coming-soon__back {
  margin-top: var(--space-xl);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* --- Animations --- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

/* Reveal animation for scroll-triggered elements */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* Staggered reveal for grid children */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 300ms; }

/* --- Capsule Divider (matches slashed pill icon — left hollow, right filled, offset) --- */
.capsule-divider {
  margin: var(--space-xl) 0;
  opacity: 0.3;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.capsule-divider:hover {
  opacity: 0.55;
}

.capsule-divider svg {
  display: block;
  width: 60px;
  height: 26px;
}

/* --- Clickable Domain Cards --- */
.domain-card__link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.domain-card__link:hover {
  color: inherit;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  :root {
    --space-2xl: 5rem;
  }

  .hero {
    padding-top: var(--space-xl);
    min-height: 90vh;
  }

  .hero__logo {
    width: min(300px, 85vw);
  }

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

  .site-header__nav {
    gap: var(--space-md);
  }

  .lang-switch {
    margin-left: var(--space-md);
    padding-left: var(--space-md);
  }

  .contact__channel {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .footer__inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-lg);
  }

  .footer__legal {
    justify-content: center;
  }
}

/* --- Site Header (internal pages) --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(8, 8, 10, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  display: flex;
  align-items: center;
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-header__home {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.site-header__home:hover {
  color: var(--yellow);
}

.site-header__nav {
  display: flex;
  gap: var(--space-lg);
}

.site-header__nav-link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.site-header__nav-link:hover,
.site-header__nav-link.active {
  color: var(--yellow);
}

/* --- Page Layout --- */
.page {
  padding-top: calc(var(--header-height) + var(--space-xl));
  padding-bottom: var(--space-2xl);
  min-height: 100vh;
}

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

.page-header__label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: var(--space-sm);
  display: block;
}

.page-header__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.page-header__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 56ch;
  line-height: 1.7;
}

/* --- Page Prose --- */
.prose {
  max-width: 64ch;
}

.prose p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.prose p strong {
  color: var(--text-primary);
  font-weight: 500;
}

.prose p .accent {
  color: var(--yellow);
}

.prose h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  text-transform: none;
  letter-spacing: 0.02em;
}

/* --- Project Cards --- */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

@media (min-width: 640px) {
  .project-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.project-card {
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--bg-surface);
  transition: border-color var(--duration-normal) var(--ease-out);
}

.project-card:hover {
  border-color: var(--border-hover);
}

.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.project-card__name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 2px;
}

.badge--planned  { background: rgba(255,255,255,0.06); color: var(--text-dim); }
.badge--in-dev   { background: rgba(232,224,64,0.12); color: var(--yellow); }
.badge--alpha    { background: rgba(59,130,246,0.12); color: #3B82F6; }
.badge--live     { background: rgba(16,185,129,0.12); color: #10B981; }

.project-card__description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-dim);
}

.project-card__link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--yellow);
}

/* --- Research Item --- */
.research-item {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
}

.research-item:last-child {
  border-bottom: none;
}

.research-item__label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: var(--space-xs);
}

.research-item__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.research-item__text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Blog Entry --- */
.blog-entry {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
}

.blog-entry__date {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: var(--space-xs);
}

.blog-entry__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.blog-entry__title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.blog-entry__title a:hover {
  color: var(--yellow);
}

.blog-entry__excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Language Switcher --- */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: var(--space-lg);
  border-left: 1px solid var(--border);
  padding-left: var(--space-lg);
}

.lang-switch__link {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  padding: 4px 6px;
  border-radius: 2px;
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.lang-switch__link:hover {
  color: var(--text-primary);
}

.lang-switch__link.active {
  color: var(--yellow);
  background: var(--yellow-glow);
}

.lang-switch__sep {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.5rem;
  opacity: 0.3;
  user-select: none;
}

/* --- Contact Section --- */
.contact {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

.contact__channels {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

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

.contact__channel-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yellow);
  min-width: 64px;
}

.contact__email-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.contact__email-btn:hover {
  border-color: var(--border-hover);
  background: var(--bg-surface-hover);
}

.contact__email-btn.copied {
  border-color: var(--yellow);
  color: var(--yellow);
}

.contact__email-btn svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
  flex-shrink: 0;
}

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

.contact__social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.contact__social-link:hover {
  color: var(--text-primary);
}

.contact__social-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  flex-shrink: 0;
}

/* --- Legal Pages --- */
.legal {
  max-width: 64ch;
}

.legal h2 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.legal p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.legal ul {
  list-style: none;
  padding-left: var(--space-md);
  margin-bottom: var(--space-md);
}

.legal ul li {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  position: relative;
  padding-left: var(--space-md);
}

.legal ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-dim);
}

.legal a {
  color: var(--yellow);
}

.legal strong {
  color: var(--text-primary);
  font-weight: 500;
}

.legal__updated {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: var(--space-xl);
}

/* --- Footer Legal Links --- */
.footer__legal {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer__legal-link {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__legal-link:hover {
  color: var(--text-secondary);
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

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