/* ========================================
   Brainitor — Stealth Homepage Styles
   ======================================== */

/* --- Custom Properties --- */
:root {
  --bg-deep: #0a1628;
  --bg-mid: #0f2340;
  --bg-card: rgba(15, 35, 64, 0.6);
  --accent: #14b8a6;
  --accent-hover: #0d9488;
  --cta: #f97316;
  --cta-hover: #ea580c;
  --text-primary: #ffffff;
  --text-body: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border-subtle: rgba(148, 163, 184, 0.1);
  --border-card: rgba(148, 163, 184, 0.15);
  --font-heading: 'Source Serif 4', Georgia, serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;
  --container: 1120px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 8rem;
  --radius: 8px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
}

/* --- 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-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-body);
  background-color: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul {
  list-style: none;
}

/* --- Utilities --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 1000;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: var(--bg-deep);
  font-weight: 600;
  border-radius: var(--radius);
  transition: top var(--transition);
}

.skip-link:focus {
  top: 16px;
  color: var(--bg-deep);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  transition: background var(--transition), box-shadow var(--transition);
}

.nav--scrolled {
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border-subtle);
}

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

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--text-primary);
  text-decoration: none;
}

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

.nav__logo-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 6px;
}

.nav__logo-text {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--bg-deep);
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition), transform 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  background: var(--accent-hover);
  color: var(--bg-deep);
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.btn--small {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

.input {
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-body);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition), background var(--transition);
  width: 100%;
}

.input::placeholder {
  color: var(--text-dim);
}

.input:focus {
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.1);
}

/* --- Hero --- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 8rem 0 6rem;
  overflow: hidden;
}

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

.hero__overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 40%, rgba(20, 184, 166, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 80% 60% at 20% 80%, rgba(15, 35, 64, 0.8) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-deep) 0%, rgba(10, 22, 40, 0.3) 40%, var(--bg-deep) 100%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  max-width: 600px;
}

.hero__form-row {
  display: flex;
  gap: 0.75rem;
  max-width: 480px;
}

.hero__form-row .input {
  flex: 1;
}

.hero__form-note {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.hero__form-success p,
.cta__form-success p {
  color: var(--accent);
  font-weight: 500;
  font-size: 1.0625rem;
}

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

.section__header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-xl);
}

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: -0.015em;
}

.section__subtitle {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--text-muted);
  line-height: 1.7;
}

/* --- Stats --- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.stat {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
}

.stat__number {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3vw, 2.75rem);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.stat__label {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --- Cards --- */
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.card {
  padding: 2.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), transform var(--transition);
}

.card:hover {
  border-color: rgba(20, 184, 166, 0.3);
  transform: translateY(-2px);
}

.card__icon {
  margin-bottom: 1.25rem;
  opacity: 0.9;
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.625rem;
}

.card__text {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* --- Grid 2x2 (Why Now) --- */
.why-now {
  background:
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(20, 184, 166, 0.04) 0%, transparent 70%),
    var(--bg-deep);
}

.grid-2x2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.grid-item {
  padding: 2.25rem;
  border-left: 2px solid var(--border-card);
  transition: border-color var(--transition);
}

.grid-item:hover {
  border-left-color: var(--accent);
}

.grid-item__marker {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.grid-item__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.grid-item__text {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* --- Team --- */
.team__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.team-card {
  text-align: center;
  padding: 2.5rem 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
}

.team-card__avatar {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(20, 184, 166, 0.15), rgba(20, 184, 166, 0.05));
  border: 1px solid rgba(20, 184, 166, 0.25);
  border-radius: 50%;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
}

.team-card__photo {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.25rem;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(20, 184, 166, 0.25);
}

.team-card__name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.team-card__role {
  font-size: 0.9375rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1rem;
}

.team-card__details {
  margin-bottom: 1.25rem;
}

.team-card__details li {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 0.2rem 0;
}

.team-card__social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--text-muted);
  border: 1px solid var(--border-card);
  border-radius: 50%;
  transition: color var(--transition), border-color var(--transition);
}

.team-card__social:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* --- CTA --- */
.cta {
  padding: var(--space-2xl) 0;
}

.cta__inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  padding: 3.5rem 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
}

.cta__form {
  margin-top: 2rem;
}

.cta__form-row {
  display: flex;
  gap: 0.75rem;
  max-width: 420px;
  margin: 0 auto;
}

.cta__form-row .input {
  flex: 1;
}

.cta__form-success {
  margin-top: 1rem;
}

.cta__links {
  margin-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.cta__links a {
  color: var(--text-muted);
  transition: color var(--transition);
}

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

.cta__links-divider {
  color: var(--text-dim);
}

/* --- Footer --- */
.footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border-subtle);
}

.footer__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.footer__tagline {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-dim);
}

.footer__social {
  display: flex;
  gap: 1rem;
}

.footer__social a {
  color: var(--text-dim);
  transition: color var(--transition);
}

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

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__links a {
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.footer__links a:hover {
  color: var(--text-muted);
}

.footer__disclaimer {
  margin-top: 1.5rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  opacity: 0.7;
}

/* --- Scroll Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

  .card,
  .btn,
  .grid-item {
    transition: none;
  }

  .hero__canvas {
    display: none;
  }
}

/* --- Responsive: Tablet --- */
@media (max-width: 1024px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

  .section__header {
    margin-bottom: var(--space-lg);
  }

  .hero {
    padding: 7rem 0 4rem;
    min-height: auto;
  }

  .hero__form-row,
  .cta__form-row {
    flex-direction: column;
  }

  .hero__form-row .btn,
  .cta__form-row .btn {
    width: 100%;
  }

  .stats {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .stat {
    padding: 1.5rem;
  }

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

  .grid-2x2 {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .team__grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .footer__top {
    flex-direction: column;
    gap: 1.5rem;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }

  .cta__inner {
    padding: 2.5rem 1.5rem;
  }

  .cta__links {
    flex-direction: column;
    gap: 0.75rem;
  }

  .cta__links-divider {
    display: none;
  }
}