/* =============================================
   0. Custom Properties
   ============================================= */
:root {
  --color-bg: #09090B;
  --color-surface: #111113;
  --color-surface-elevated: #18181B;
  --color-border: #27272A;
  --color-border-subtle: #1E1E22;
  --color-primary: #EA580C;
  --color-primary-hover: #F97316;
  --color-primary-light: #FB923C;
  --color-primary-glow: rgba(234, 88, 12, 0.12);
  --color-text: #FAFAFA;
  --color-text-secondary: #A1A1AA;
  --color-text-muted: #71717A;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --section-padding: clamp(64px, 10vw, 128px);
  --container-max: 1200px;
  --container-padding: clamp(20px, 4vw, 48px);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* =============================================
   1. Reset & Base
   ============================================= */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

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

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* =============================================
   2. Layout
   ============================================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* =============================================
   3. Components — Buttons
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: 0 0 24px var(--color-primary-glow);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface);
}

.btn--sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn--full {
  width: 100%;
  justify-content: center;
}

/* =============================================
   4. Components — Tags
   ============================================= */
.tag {
  display: inline-flex;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  background: var(--color-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
}

/* =============================================
   5. Header
   ============================================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition-base);
}

.header.is-scrolled {
  background: rgba(9, 9, 11, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: 12px 0;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  z-index: 10;
}

.header__logo-icon {
  width: 26px;
  height: 30px;
  color: var(--color-primary);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header__link {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.header__link:hover {
  color: var(--color-text);
}

.header__mobile-cta {
  display: none;
}

.header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 10;
}

.header__toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all var(--transition-base);
  transform-origin: center;
}

.header__toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.header__toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =============================================
   6. Hero
   ============================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 1;
  pointer-events: none;
}

.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 40%, rgba(234, 88, 12, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, transparent 0%, var(--color-bg) 70%),
    linear-gradient(to bottom, transparent 60%, var(--color-bg) 100%);
  z-index: 1;
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 160px 0 80px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--color-primary-light);
  background: var(--color-primary-glow);
  border: 1px solid rgba(234, 88, 12, 0.2);
  border-radius: var(--radius-full);
  margin-bottom: 32px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  animation: fadeUp 0.8s ease 0.2s both;
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.hero__title {
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero__title-line {
  display: block;
}

.hero__title--accent {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeUp 0.8s ease 0.4s both;
}

.hero__title-line:nth-child(2) {
  animation: fadeUp 0.8s ease 0.5s both;
}

.hero__subtitle {
  max-width: 640px;
  margin: 0 auto 40px;
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: var(--color-text-secondary);
  animation: fadeUp 0.8s ease 0.7s both;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 80px;
  animation: fadeUp 0.8s ease 0.9s both;
}

.hero__pillars {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  animation: fadeUp 0.8s ease 1.1s both;
}

.hero__pillar {
  text-align: center;
}

.hero__pillar-label {
  display: block;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.hero__pillar-value {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.hero__pillar-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

/* =============================================
   7. Sections (shared)
   ============================================= */
.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section__header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section__label {
  display: inline-block;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.section__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section__desc {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* =============================================
   8. Research
   ============================================= */
.research__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.research__card {
  padding: 36px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-slow);
}

.research__card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 40px var(--color-primary-glow), 0 8px 32px rgba(0, 0, 0, 0.3);
  transform: translateY(-4px);
}

.research__number {
  display: inline-block;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.research__card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.research__card-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.research__card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* =============================================
   9. Approach
   ============================================= */
.approach__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.approach__card {
  padding: 36px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-slow);
}

.approach__card:hover {
  border-color: var(--color-border);
  transform: translateY(-2px);
}

.approach__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-glow);
  border: 1px solid rgba(234, 88, 12, 0.15);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  margin-bottom: 24px;
}

.approach__card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.approach__card-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* =============================================
   9b. Manifesto Quote & Mission
   ============================================= */
.manifesto-quote {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 48px;
  padding: 48px;
  border: none;
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
}

.manifesto-quote p {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 500;
  line-height: 1.5;
  color: var(--color-text);
  font-style: italic;
}

.mission-card {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  padding: 48px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-slow);
}

.mission-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 40px var(--color-primary-glow);
}

.mission-card .section__label {
  margin-bottom: 12px;
}

.mission-card__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.mission-card__desc {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* =============================================
   10. About
   ============================================= */
.about__features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.about__feature {
  padding: 32px;
  border-left: 2px solid var(--color-border);
  transition: border-color var(--transition-base);
}

.about__feature:hover {
  border-left-color: var(--color-primary);
}

.about__feature-icon {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 16px;
  font-weight: 600;
}

.about__feature-title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.about__feature-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* =============================================
   11. Contact
   ============================================= */
.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact__desc {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact__info-item {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.contact__info-item svg {
  flex-shrink: 0;
}

.contact__info-item:hover {
  color: var(--color-primary);
}

.contact__form {
  padding: 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
}

.form__group {
  margin-bottom: 20px;
}

.form__group:last-of-type {
  margin-bottom: 24px;
}

.form__label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 8px;
}

.form__input {
  width: 100%;
  padding: 12px 16px;
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form__input::placeholder {
  color: var(--color-text-muted);
}

.form__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

/* =============================================
   12. Footer
   ============================================= */
.footer {
  padding: 64px 0 32px;
  border-top: 1px solid var(--color-border-subtle);
}

.footer__top {
  display: flex;
  justify-content: space-between;
  gap: 64px;
  margin-bottom: 48px;
}

.footer__brand {
  max-width: 280px;
}

.footer__tagline {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 12px;
}

.footer__links {
  display: flex;
  gap: 64px;
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__col-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.footer__link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-subtle);
}

.footer__copyright {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer__social {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer__social-link {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

[data-animate]:nth-child(2) { transition-delay: 0.1s; }
[data-animate]:nth-child(3) { transition-delay: 0.2s; }
[data-animate]:nth-child(4) { transition-delay: 0.3s; }

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

/* =============================================
   14. Responsive
   ============================================= */
@media (max-width: 768px) {
  .header__nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 32px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }

  .header__nav.is-open {
    opacity: 1;
    visibility: visible;
  }

  .header__nav .header__link {
    font-size: 1.5rem;
  }

  .header__mobile-cta {
    display: inline-flex;
  }

  .header__cta {
    display: none;
  }

  .header__toggle {
    display: flex;
  }

  .hero__inner {
    padding: 140px 0 60px;
  }

  .hero__actions {
    flex-direction: column;
    gap: 12px;
  }

  .hero__actions .btn {
    width: 100%;
    justify-content: center;
  }

  .hero__pillars {
    flex-direction: column;
    gap: 24px;
  }

  .hero__pillar-divider {
    width: 40px;
    height: 1px;
  }

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

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

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

  .contact__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer__top {
    flex-direction: column;
    gap: 40px;
  }

  .footer__links {
    flex-wrap: wrap;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .research__card,
  .approach__card,
  .contact__form {
    padding: 24px;
  }

  .about__feature {
    padding: 24px;
  }
}