/* ============================================================
   AAIRC — Advanced AI Research Corporation
   Dark Orange / Black Theme with Tile Layout
   ============================================================ */

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

:root {
  --bg:        #0a0a0a;
  --bg-card:   #141414;
  --bg-card-hover: #1c1c1c;
  --bg-nav:    rgba(10,10,10,0.95);
  --orange:    #FF6B00;
  --orange-lt: #FF8C00;
  --orange-dk: #E65100;
  --red:       #FF4500;
  --white:     #FFFFFF;
  --gray:      #999999;
  --gray-lt:   #b8b8b8;
  --gray-dk:   #333333;
  --border:    #222222;
  --font:      'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono:      'JetBrains Mono', 'Fira Code', monospace;
  --radius:    12px;
  --shadow:    0 4px 24px rgba(0,0,0,0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--gray-lt);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--orange); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--orange-lt); }

h1, h2, h3, h4 { color: var(--white); font-weight: 700; line-height: 1.2; }

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  max-width: 1200px;
  margin: 0 auto;
  height: 72px;
}

.nav-logo {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo svg { width: 40px; height: 40px; }

.nav-logo-text {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--orange);
  letter-spacing: 2px;
}

.nav-logo-text span { color: var(--white); }

.nav-logo-slogan {
  width: 100%;
  font-size: 0.7rem;
  color: var(--gray);
  letter-spacing: 1px;
  margin-top: -8px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  color: var(--gray-lt);
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
  background: rgba(255, 107, 0, 0.12);
}

.nav-links a.active { color: var(--orange); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all var(--transition);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 30%, rgba(255,107,0,0.08) 0%, transparent 70%),
    radial-gradient(circle at 20% 80%, rgba(255,69,0,0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,140,0,0.04) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 20px;
  border-radius: 100px;
  border: 1px solid rgba(255, 107, 0, 0.3);
  background: rgba(255, 107, 0, 0.08);
  color: var(--orange);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--white) 0%, var(--orange-lt) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--gray);
  max-width: 650px;
  margin: 0 auto 48px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--orange) 0%, var(--orange-dk) 100%);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(255, 107, 0, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 107, 0, 0.4);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--gray-dk);
}

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

/* ---------- Sections ---------- */
section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
}

.section-label {
  display: inline-block;
  color: var(--orange);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* ---------- Tile Grid ---------- */
.tile-grid {
  display: grid;
  gap: 24px;
}

.tile-grid-2 { grid-template-columns: repeat(2, 1fr); }
.tile-grid-3 { grid-template-columns: repeat(3, 1fr); }
.tile-grid-4 { grid-template-columns: repeat(4, 1fr); }

.tile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 32px;
  transition: all var(--transition);
}

.tile:hover {
  border-color: var(--orange);
  background: var(--orange);
  transform: translateY(-4px);
  color: #000;
}

.tile:hover h3,
.tile:hover p,
.tile:hover a,
.tile:hover .tile-tag,
.tile:hover .product-features li {
  color: #000;
}

.tile:hover .tile-icon {
  background: #000;
  color: var(--orange);
}

.tile-icon {
  width: 56px;
  height: 56px;
  border-radius: 0;
  background: rgba(255, 107, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--orange);
  font-size: 1.5rem;
}

.tile h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.tile p {
  color: var(--gray);
  font-size: 0.95rem;
  line-height: 1.6;
}

.tile-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 0;
  background: rgba(255, 107, 0, 0.1);
  color: var(--orange);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 16px;
}

/* ---------- Stats Row ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 60px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stat {
  text-align: center;
}

.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--orange);
  display: block;
}

.stat-label {
  color: var(--gray);
  font-size: 0.9rem;
  margin-top: 4px;
}

/* ---------- Product Cards ---------- */
.product-category {
  margin-bottom: 64px;
}

.product-category h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.product-category > p {
  color: var(--gray);
  margin-bottom: 32px;
  font-size: 1rem;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 32px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  border-color: var(--orange);
  background: var(--orange);
  transform: translateY(-4px);
  color: #000;
}

.product-card:hover h4,
.product-card:hover h4 + span,
.product-card:hover p,
.product-card:hover a,
.product-card:hover .product-features li {
  color: #000;
}

.product-card:hover .product-card-icon {
  background: #000;
  color: var(--orange);
}

.product-card-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}

.product-card-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 0;
  background: rgba(255, 107, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--orange);
  font-size: 1.3rem;
}

.product-card h4 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.product-card h4 + span {
  font-size: 0.8rem;
  color: var(--gray);
}

.product-card p {
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.product-features {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.product-features li {
  padding: 4px 10px;
  border-radius: 0;
  background: rgba(255, 107, 0, 0.08);
  color: var(--orange-lt);
  font-size: 0.75rem;
  font-weight: 500;
}

/* ---------- About Page ---------- */
.about-hero {
  padding: 140px 0 80px;
  text-align: center;
}

.about-hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin-bottom: 20px;
}

.about-hero p {
  font-size: 1.15rem;
  color: var(--gray);
  max-width: 700px;
  margin: 0 auto;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.about-text p {
  margin-bottom: 16px;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.value-tile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
}

.value-tile:hover {
  border-color: var(--orange);
  background: var(--orange);
  transform: translateY(-4px);
  color: #000;
}

.value-tile:hover h4,
.value-tile:hover p,
.value-tile:hover a,
.value-tile:hover .value-icon {
  color: #000;
}

.value-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.value-tile h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

/* ---------- Contact Form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  color: var(--white);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--white);
  font-family: var(--font);
  font-size: 1rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--orange);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.form-message {
  padding: 12px 16px;
  border-radius: 8px;
  margin-top: 16px;
  display: none;
  font-size: 0.9rem;
}

.form-message.success {
  background: rgba(34, 197, 94, 0.1);
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.2);
  display: block;
}

.form-message.error {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
  display: block;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-info-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 10px;
  background: rgba(255, 107, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--orange);
  font-size: 1.2rem;
}

.contact-info-item h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.contact-info-item p {
  color: var(--gray);
  font-size: 0.9rem;
}

/* ---------- Footer ---------- */
.footer {
  background: #050505;
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--gray);
  font-size: 0.9rem;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 20px;
  color: var(--white);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--gray);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--orange);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--gray);
}

/* ---------- CTA Section ---------- */
.cta-section {
  text-align: center;
  padding: 80px 24px;
  background: linear-gradient(135deg, rgba(255,107,0,0.05) 0%, rgba(255,69,0,0.03) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cta-section h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--gray);
  font-size: 1.1rem;
  margin-bottom: 32px;
}

/* ---------- Tech Stack Badge Row ---------- */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

.tech-badge {
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--gray-lt);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--mono);
}

/* ---------- Page Header (non-home pages) ---------- */
.page-header {
  padding: 140px 0 60px;
  text-align: center;
  position: relative;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 40%, rgba(255,107,0,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.page-header h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin-bottom: 16px;
  position: relative;
}

.page-header p {
  color: var(--gray);
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

/* ---------- Highlight Strip ---------- */
.highlight-strip {
  display: flex;
  align-items: center;
  gap: 48px;
  padding: 24px 0;
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.highlight-strip span {
  white-space: nowrap;
  color: var(--gray-dk);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
}

/* ---------- Spinner ---------- */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .tile-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .hamburger { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 4px;
  }

  .nav-links.open { display: flex; }

  .tile-grid-2,
  .tile-grid-3,
  .tile-grid-4 { grid-template-columns: 1fr; }

  .stats { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}