@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --color-ink: #08080a;
  --color-ink-subtle: #0f0f12;
  --color-ink-card: #121216;
  --color-ink-card-hover: #18181f;
  
  --color-primary: #ffffff;
  --color-secondary: #9ca3af;
  --color-tertiary: #6b7280;
  
  --color-hairline: rgba(255, 255, 255, 0.08);
  --color-hairline-hover: rgba(255, 255, 255, 0.18);
  --color-glow: rgba(56, 189, 248, 0.14);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, Monaco, monospace;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: all 0.2s var(--ease-out);
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--color-ink);
  color: var(--color-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-ink);
  color: var(--color-primary);
  line-height: 1.55;
  overflow-x: hidden;
  position: relative;
}

.container {
  width: 100%;
  max-width: 1160px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.75rem;
  padding-right: 1.75rem;
}

.container-narrow {
  max-width: 820px;
}

.bg-atmosphere {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 850px;
  background: 
    radial-gradient(ellipse 900px 480px at 50% 12%, rgba(24, 119, 242, 0.14), transparent 65%),
    radial-gradient(ellipse 600px 320px at 50% 28%, rgba(99, 102, 241, 0.08), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background-color 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s ease;
  border-bottom: 1px solid transparent;
}

.nav-header.scrolled {
  background: rgba(8, 8, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-color: var(--color-hairline);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--color-primary);
}

.nav-brand-logo {
  width: 38px;
  height: 38px;
  display: block;
  flex-shrink: 0;
}

.nav-brand-text {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #ffffff;
}

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

.nav-menu a {
  text-decoration: none;
  color: var(--color-secondary);
  font-size: 14.5px;
  font-weight: 400;
  transition: color 0.15s ease;
}

.nav-menu a:hover {
  color: var(--color-primary);
}

.nav-cta-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: 9999px;
  font-size: 14.5px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-sans);
  border: 1px solid transparent;
}

.btn-white {
  background-color: #ffffff;
  color: #08080a;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.btn-white:hover {
  background-color: #f1f1f4;
  transform: translateY(-1px);
}

.btn-glass {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-primary);
  border-color: var(--color-hairline);
  backdrop-filter: blur(10px);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-hairline-hover);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 13px 30px;
  font-size: 15.5px;
}

.hero-section {
  position: relative;
  z-index: 1;
  padding-top: 170px;
  padding-bottom: 90px;
  text-align: center;
}

.hero-logo-center {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 92px;
  height: 92px;
  margin-bottom: 32px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-hairline);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 40px var(--color-glow);
  padding: 14px;
  transition: transform 0.3s var(--ease-out);
}

.hero-logo-center:hover {
  transform: scale(1.05);
}

.hero-logo-img {
  width: 100%;
  height: 100%;
}

.hero-title {
  font-size: clamp(40px, 6.2vw, 76px);
  line-height: 1.04;
  font-weight: 700;
  letter-spacing: -0.04em;
  margin-bottom: 22px;
  color: #ffffff;
}

.hero-title-dim {
  color: rgba(255, 255, 255, 0.45);
  font-weight: 500;
  display: block;
}

.hero-subtitle {
  font-size: clamp(17px, 2.1vw, 20px);
  color: var(--color-secondary);
  font-weight: 400;
  max-width: 760px;
  margin: 0 auto 40px;
  line-height: 1.55;
  letter-spacing: -0.01em;
}

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

.stack-section {
  position: relative;
  z-index: 1;
  padding: 40px 0 80px;
  border-bottom: 1px solid var(--color-hairline);
}

.stack-label {
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-tertiary);
  margin-bottom: 24px;
}

.stack-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.stack-card {
  background: var(--color-ink-subtle);
  border: 1px solid var(--color-hairline);
  border-radius: 14px;
  padding: 18px 14px;
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.stack-card:hover {
  background: var(--color-ink-card);
  border-color: var(--color-hairline-hover);
  transform: translateY(-2px);
}

.stack-card-icon {
  font-size: 22px;
  font-weight: 700;
  font-family: var(--font-mono);
}

.stack-card-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.stack-card-role {
  font-size: 12.5px;
  color: var(--color-secondary);
  line-height: 1.4;
}

.stack-java .stack-card-icon { color: #f89820; }
.stack-dotnet .stack-card-icon { color: #512bd4; }
.stack-rust .stack-card-icon { color: #f74c00; }
.stack-python .stack-card-icon { color: #3776ab; }
.stack-ts .stack-card-icon { color: #3178c6; }

.section-y {
  padding-top: 100px;
  padding-bottom: 100px;
  position: relative;
  z-index: 1;
}

.border-hairline-t {
  border-top: 1px solid var(--color-hairline);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-head-tag {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #38bdf8;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.14;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--color-primary);
  margin-bottom: 14px;
}

.section-head p {
  font-size: 16.5px;
  color: var(--color-secondary);
  line-height: 1.6;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  background: var(--color-ink-card);
  border: 1px solid var(--color-hairline);
  border-radius: 18px;
  padding: 32px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  background: var(--color-ink-card-hover);
  border-color: var(--color-hairline-hover);
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

.service-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.service-card p {
  font-size: 14.5px;
  color: var(--color-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.service-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--color-hairline);
}

.service-badge {
  font-size: 12px;
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-hairline);
  color: #d1d5db;
  padding: 3px 8px;
  border-radius: 6px;
}

.arch-flow-list {
  max-width: 960px;
  margin: 0 auto;
  border-top: 1px solid var(--color-hairline);
}

.arch-flow-row {
  display: grid;
  grid-template-columns: 80px 1fr 220px;
  align-items: baseline;
  gap: 32px;
  padding: 38px 16px;
  border-bottom: 1px solid var(--color-hairline);
  transition: background-color 0.2s var(--ease-out), padding-left 0.2s var(--ease-out);
  border-radius: 8px;
}

.arch-flow-row:hover {
  background: rgba(255, 255, 255, 0.02);
  padding-left: 24px;
}

.arch-flow-index {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-tertiary);
  letter-spacing: -0.02em;
  transition: color 0.2s ease;
}

.arch-flow-row:hover .arch-flow-index {
  color: #ffffff;
}

.arch-flow-body h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin-bottom: 8px;
}

.arch-flow-body p {
  font-size: 14.5px;
  color: var(--color-secondary);
  line-height: 1.6;
}

.arch-flow-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
  font-family: var(--font-mono);
  font-size: 12px;
}

.arch-flow-meta span {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-hairline);
  padding: 4px 12px;
  border-radius: 6px;
  color: #a1a1aa;
}

.site-footer {
  border-top: 1px solid var(--color-hairline);
  padding: 64px 0 36px;
  color: var(--color-secondary);
  font-size: 14px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 48px;
  flex-wrap: wrap;
  gap: 36px;
}

.footer-brand {
  max-width: 360px;
}

.footer-brand-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.footer-brand-logo {
  width: 32px;
  height: 32px;
}

.footer-brand-title {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 17px;
}

.footer-brand p {
  font-size: 13.5px;
  color: var(--color-tertiary);
  line-height: 1.6;
}

.footer-nav {
  display: flex;
  gap: 56px;
}

.footer-links-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-col h5 {
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.footer-links-col a {
  color: var(--color-secondary);
  text-decoration: none;
  font-size: 13.5px;
  transition: color 0.15s ease;
}

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

.footer-bottom {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--color-hairline);
  color: var(--color-tertiary);
  font-size: 13px;
}

@media (max-width: 1024px) {
  .stack-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .arch-bento-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .hero-section {
    padding-top: 130px;
    padding-bottom: 60px;
  }
  .hero-logo-center {
    width: 76px;
    height: 76px;
  }
  .stack-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .arch-bento-grid {
    grid-template-columns: 1fr;
  }
  .footer-top,
  .footer-bottom {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
}

.faq-list {
  max-width: 780px;
  margin: 0 auto;
  border-top: 1px solid var(--color-hairline);
}

.faq-item {
  border-bottom: 1px solid var(--color-hairline);
}

.faq-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  background: none;
  border: none;
  outline: none;
  color: var(--color-primary);
  font-size: 17px;
  font-weight: 500;
  font-family: var(--font-sans);
  text-align: left;
  cursor: pointer;
  letter-spacing: -0.01em;
  transition: color 0.15s ease, opacity 0.15s ease;
}

.faq-trigger:hover {
  color: #ffffff;
  opacity: 0.9;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--color-tertiary);
  transition: transform 0.25s var(--ease-out), color 0.15s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-trigger {
  color: #ffffff;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: #ffffff;
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  color: var(--color-secondary);
  font-size: 15px;
  line-height: 1.65;
}

.faq-inner {
  padding-bottom: 24px;
}