:root {
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --text: #0F172A;
  --text-secondary: #64748B;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --line: rgba(15, 23, 42, 0.09);
  --radius: 18px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.03);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.07), 0 2px 6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.09), 0 4px 12px rgba(15, 23, 42, 0.05);
  --serif: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', 'SFMono-Regular', Menlo, monospace;
}

:root[data-theme="dark"] {
  --bg: #0B1220;
  --card: #131B2C;
  --text: #E8EDF7;
  --text-secondary: #92A0B8;
  --accent: #5B8DEF;
  --accent-hover: #7DA3F5;
  --line: rgba(232, 237, 247, 0.09);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25), 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35), 0 2px 6px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45), 0 4px 12px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
  transition: background-color 0.35s ease, color 0.35s ease;
}

:root[data-theme="dark"] body {
  background-image:
    linear-gradient(rgba(232, 237, 247, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 237, 247, 0.05) 1px, transparent 1px);
}

/* subtle film-grain overlay for texture / non-flat feel */
.grain {
  position: fixed;
  inset: 0;
  z-index: 500;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
:root[data-theme="dark"] .grain {
  opacity: 0.06;
  mix-blend-mode: overlay;
}

.skip-link {
  position: absolute;
  left: -9999px;
  background: var(--accent);
  color: white;
  padding: 12px 20px;
  border-radius: 8px;
  z-index: 999;
}
.skip-link:focus { left: 16px; top: 16px; }

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

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  transition: background 0.35s ease, box-shadow 0.35s ease, backdrop-filter 0.35s ease;
}
.navbar.scrolled {
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.04);
}
:root[data-theme="dark"] .navbar.scrolled {
  background: rgba(11, 18, 32, 0.8);
  box-shadow: 0 1px 0 rgba(232, 237, 247, 0.06), 0 8px 24px rgba(0, 0, 0, 0.3);
}
.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 22px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 20px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
  font-optical-sizing: auto;
}
.nav-links {
  display: flex;
  gap: 8px;
  flex: 1;
  justify-content: center;
  font-family: var(--mono);
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.01em;
  transition: color 0.2s ease;
  position: relative;
  padding: 8px 14px;
}
.nav-links a::before { content: '/ '; color: rgba(37, 99, 235, 0.45); }
.nav-links a:hover { color: var(--accent); }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: rgba(248,250,252,0.98);
  backdrop-filter: blur(12px);
  padding: 8px 24px 24px;
  box-shadow: var(--shadow-md);
  font-family: var(--mono);
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 14px 4px;
  font-size: 15px;
  border-bottom: 1px solid var(--line);
}
.mobile-nav .btn { margin-top: 14px; text-align: center; font-family: var(--sans); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 11px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1.5px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.15), 0 4px 12px rgba(37, 99, 235, 0.18);
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.28);
}
.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}
.btn-secondary:hover {
  border-color: rgba(15, 23, 42, 0.24);
  background: rgba(15, 23, 42, 0.02);
  transform: translateY(-1px);
}
.btn-nav { padding: 10px 20px; font-size: 13.5px; font-family: var(--sans); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1.5px solid var(--line);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: rgba(37, 99, 235, 0.35);
  color: var(--accent);
  transform: translateY(-1px);
}
.theme-toggle svg { display: none; }
.theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ---------- Layout helpers ---------- */
.section { padding: 128px 32px; position: relative; }
.section-alt { background: rgba(15, 23, 42, 0.025); }
.section-inner { max-width: 1200px; margin: 0 auto; }
.center { text-align: center; margin-left: auto; margin-right: auto; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: flex-start;
  color: var(--accent);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.04em;
  margin-bottom: 20px;
}
.eyebrow.center { justify-content: center; }
.eyebrow-index {
  color: rgba(37, 99, 235, 0.4);
  font-weight: 400;
}
.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

h1, h2, h3 {
  font-family: var(--serif);
  font-optical-sizing: auto;
  letter-spacing: -0.01em;
  font-weight: 600;
}
h2 { font-size: 38px; margin-bottom: 48px; max-width: 640px; line-height: 1.15; }
.section h2.center { max-width: 620px; margin-left: auto; margin-right: auto; }

.body-text {
  color: var(--text-secondary);
  font-size: 17.5px;
  margin-bottom: 18px;
  max-width: 540px;
}
.contact-text { max-width: 540px; margin-left: auto; margin-right: auto; margin-bottom: 52px; }

/* ---------- Hero ---------- */
.hero {
  padding: 172px 32px 96px;
  max-width: 1200px;
  margin: 0 auto;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.hero-text h1 {
  font-size: 58px;
  line-height: 1.05;
  margin-bottom: 26px;
  font-weight: 500;
}
.hero-text h1 span {
  color: var(--accent);
  font-weight: 600;
  font-style: italic;
}
.subtitle {
  font-size: 21px;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 20px;
  max-width: 540px;
  line-height: 1.5;
}
.hero-text .body-text {
  margin-bottom: 36px;
  font-family: var(--mono);
  font-size: 14.5px;
  border-left: 2px solid var(--line);
  padding-left: 16px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  transform: rotate(1.2deg);
}
.hero-image img {
  width: 100%;
  max-width: 440px;
  height: auto;
  aspect-ratio: 1023 / 1537;
  object-fit: cover;
  border-radius: 22px;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255,255,255,0.6);
  align-self: flex-start;
}
.hero-image-glow {
  position: absolute;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(37,99,235,0.16) 0%, rgba(37,99,235,0) 70%);
  top: 6%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 0;
}
.hero-image::after {
  content: '';
  position: absolute;
  inset: 6% 10%;
  border: 1.5px dashed rgba(37, 99, 235, 0.25);
  border-radius: 28px;
  z-index: 0;
  transform: rotate(-2.4deg);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding-top: 8px;
}
.mini-card {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 26px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.mini-card:nth-child(2) { margin-top: 22px; }
.mini-card:nth-child(4) { margin-top: 22px; }
.mini-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(37, 99, 235, 0.25);
}
.mini-icon {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.mini-card h3 { font-size: 18px; margin-bottom: 8px; font-weight: 600; }
.mini-card p { color: var(--text-secondary); font-size: 14.5px; }

/* ---------- Stats ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 8px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat-card {
  background: var(--card);
  padding: 48px 24px;
  text-align: center;
  transition: background 0.3s ease;
}
.stat-card:hover { background: rgba(37, 99, 235, 0.03); }
.stat-number {
  display: block;
  font-family: var(--serif);
  font-size: 46px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.stat-text { font-size: 32px; font-style: italic; }
.stat-card p {
  color: var(--text-secondary);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* ---------- Tech grid ---------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 8px;
}
.tech-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 24px 16px;
  text-align: center;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 14.5px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}
.tech-card span::before { content: '#'; color: rgba(37, 99, 235, 0.4); margin-right: 2px; }
.tech-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  color: var(--accent);
  border-color: rgba(37, 99, 235, 0.3);
}

/* ---------- Philosophy ---------- */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 8px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.philosophy-card {
  background: var(--card);
  padding: 40px 32px;
  transition: background 0.3s ease;
  position: relative;
}
.philosophy-card:hover { background: rgba(37, 99, 235, 0.025); }
.philosophy-mark {
  font-family: var(--mono);
  font-size: 12px;
  color: rgba(37, 99, 235, 0.4);
  display: block;
  margin-bottom: 20px;
}
.philosophy-card h3 { font-size: 20px; margin-bottom: 12px; font-weight: 600; }
.philosophy-card p { color: var(--text-secondary); font-size: 15.5px; }

/* ---------- Contact ---------- */
.contact-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn-contact {
  background: var(--card);
  color: var(--text);
  border: 1.5px solid var(--line);
  box-shadow: var(--shadow-sm);
  padding: 16px 32px;
}
.btn-contact:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ---------- Footer ---------- */
.footer {
  padding: 52px 32px;
  border-top: 1px solid var(--line);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}
.footer-inner p { color: var(--text-secondary); font-size: 14px; font-family: var(--mono); }
.footer-sub { margin-top: 6px; }
.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-top: 20px;
  font-family: var(--mono);
}
.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13.5px;
  transition: color 0.2s ease;
}
.footer-links a:hover { color: var(--accent); }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.4,0,0.2,1), transform 0.7s cubic-bezier(0.4,0,0.2,1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero-image { order: -1; transform: none; }
  .hero-image img { max-width: 300px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(3, 1fr); }
  .philosophy-grid { grid-template-columns: 1fr; }
  .mini-card:nth-child(2), .mini-card:nth-child(4) { margin-top: 0; }
}

@media (max-width: 768px) {
  .nav-links, .btn-nav { display: none; }
  .menu-toggle { display: flex; }
  .hero { padding: 136px 24px 68px; }
  .hero-text h1 { font-size: 38px; }
  .subtitle { font-size: 18.5px; }
  .section { padding: 84px 24px; }
  h2 { font-size: 28px; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-buttons { flex-direction: column; align-items: stretch; }
  .navbar.mobile-open .menu-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .navbar.mobile-open .menu-toggle span:nth-child(2) { opacity: 0; }
  .navbar.mobile-open .menu-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
}