:root {
  color-scheme: dark;
  --navy: #0b1d3a;
  --navy-2: #0f2648;
  --line: #5c8ac9;
  --line-soft: rgba(92, 138, 201, 0.35);
  --line-faint: rgba(92, 138, 201, 0.14);
  --paper: #f2ecdd;
  --paper-dim: #e4dcc7;
  --ink: #10233f;
  --coral: #ff6b4a;
  --text: #eaf0fa;
  --muted: #93a8c9;
  --border: rgba(140, 170, 220, 0.28);
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background-color: var(--navy);
  background-image: linear-gradient(var(--line-faint) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-faint) 1px, transparent 1px),
    linear-gradient(rgba(92, 138, 201, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(92, 138, 201, 0.07) 1px, transparent 1px);
  background-size: 88px 88px, 88px 88px, 22px 22px, 22px 22px;
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
}

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

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

.container {
  width: min(1160px, calc(100% - 2.5rem));
  margin: 0 auto;
}

/* ---- drafting frame ---- */
.frame {
  position: fixed;
  inset: 14px;
  border: 1px solid var(--line-soft);
  pointer-events: none;
  z-index: 40;
}

.corner {
  position: absolute;
  width: 18px;
  height: 18px;
}

.corner::before,
.corner::after {
  content: '';
  position: absolute;
  background: var(--line);
}

.corner::before {
  width: 100%;
  height: 1px;
  top: 50%;
}

.corner::after {
  width: 1px;
  height: 100%;
  left: 50%;
}

.corner-tl {
  top: -9px;
  left: -9px;
}

.corner-tr {
  top: -9px;
  right: -9px;
}

.corner-bl {
  bottom: -9px;
  left: -9px;
}

.corner-br {
  bottom: -9px;
  right: -9px;
}

/* ---- header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(11, 29, 58, 0.86);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.1em;
}

.brand-mark {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: var(--coral);
  stroke-width: 2.4;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.nav-links {
  display: flex;
  gap: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.nav-links a {
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--coral);
  transition: width 220ms ease;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a:hover::after {
  width: 100%;
}

.controls {
  display: flex;
  align-items: center;
}

.control-select {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem 0.6rem;
  font: 0.8rem var(--font-mono);
  letter-spacing: 0.08em;
}

/* ---- hero ---- */
.hero {
  padding: 4.5rem 0 3rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--coral);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
}

h1,
h2,
h3 {
  margin-top: 0;
  font-family: var(--font-display);
  font-weight: 600;
}

h1 {
  font-size: clamp(2rem, 3.2vw, 3.3rem);
  line-height: 1.12;
  margin-bottom: 1.1rem;
  letter-spacing: -0.01em;
}

.hero-text {
  color: var(--muted);
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.3rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--coral);
  color: #10131a;
  font-weight: 600;
  box-shadow: 0 14px 28px rgba(255, 107, 74, 0.22);
}

.btn-primary:hover {
  box-shadow: 0 18px 34px rgba(255, 107, 74, 0.3);
}

.btn-secondary {
  border-color: var(--border);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--line);
}

/* ---- hero schematic diagram ---- */
.hero-diagram {
  position: relative;
}

.schema-svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

.schema-svg line {
  fill: none;
  stroke: var(--line);
  stroke-width: 2;
  stroke-dasharray: var(--len, 0);
  stroke-dashoffset: var(--len, 0);
  transition: stroke-dashoffset 900ms ease;
}

.schema-svg.is-drawn line {
  stroke-dashoffset: 0;
}

.schema-svg .s-node {
  fill: var(--navy);
  stroke: var(--line);
  stroke-width: 2;
  opacity: 0;
  transform-origin: center;
  transition: opacity 400ms ease, r 400ms ease;
}

.schema-svg .s-node-center {
  fill: var(--coral);
  stroke: var(--coral);
}

.schema-svg .s-label {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--muted);
  letter-spacing: 0.04em;
  opacity: 0;
  transition: opacity 500ms ease;
}

.schema-svg .s-label-center {
  fill: var(--text);
  font-size: 15px;
  font-weight: 600;
  text-anchor: middle;
}

.schema-svg.is-drawn .s-node {
  opacity: 1;
}

.schema-svg.is-drawn .s-label {
  opacity: 1;
}

@keyframes centerPulse {
  0%,
  100% {
    r: 15;
  }
  50% {
    r: 17;
  }
}

.schema-svg.is-drawn .s-node-center {
  animation: centerPulse 3.2s ease-in-out infinite;
}

.schema-link {
  cursor: pointer;
}

.schema-link .s-node {
  transform-box: fill-box;
  transform-origin: center;
  transition: transform 200ms ease, fill 200ms ease, stroke-width 200ms ease;
}

.schema-link .s-label {
  transition: fill 200ms ease;
}

.schema-link:hover .s-node,
.schema-link:focus-visible .s-node {
  transform: scale(1.6);
  fill: var(--coral);
  stroke: var(--coral);
}

.schema-link:hover .s-label,
.schema-link:focus-visible .s-label {
  fill: var(--text);
}

.schema-link:focus-visible {
  outline: none;
}

.schema-link:focus-visible .s-label {
  fill: var(--coral);
}

/* ---- dimension strip ---- */
.dimension-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin-top: 2.5rem;
  padding-top: 1.4rem;
  border-top: 1px dashed var(--border);
}

.dim-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 120px;
}

.dim-value {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--text);
}

.dim-tick {
  width: 100%;
  height: 1px;
  background: var(--line);
  position: relative;
}

.dim-tick::before,
.dim-tick::after {
  content: '';
  position: absolute;
  top: -3px;
  width: 1px;
  height: 7px;
  background: var(--line);
}

.dim-tick::before {
  left: 0;
}

.dim-tick::after {
  right: 0;
}

.dim-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ---- sections ---- */
.section {
  padding: 4.5rem 0;
  position: relative;
}

.section-alt {
  background: rgba(20, 40, 74, 0.35);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-heading {
  margin-bottom: 2rem;
}

.section-heading h2 {
  font-size: clamp(1.5rem, 2.4vw, 2.1rem);
  max-width: 30ch;
}

.about-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: start;
}

.about-grid > p {
  color: var(--muted);
  max-width: 52ch;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-content: flex-start;
}

.pill-list span {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.83rem;
}

.pill-node {
  width: 6px;
  height: 6px;
  background: var(--coral);
  display: inline-block;
  flex-shrink: 0;
}

/* ---- project cards ---- */
.project-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.project-card {
  padding: 1.6rem;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--paper-dim);
  transition: transform 200ms ease, box-shadow 200ms ease;
  position: relative;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 26px 44px rgba(4, 10, 24, 0.35);
}

.project-icon {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.6;
  stroke-linecap: square;
  stroke-linejoin: miter;
  margin-bottom: 0.9rem;
}

.project-icon circle {
  fill: var(--coral);
  stroke: none;
}

.project-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--coral);
  margin-bottom: 0.6rem;
  font-weight: 600;
}

.project-card p {
  color: #3c4a63;
}

.project-card a {
  display: inline-block;
  margin-top: 0.9rem;
  color: var(--ink);
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border-bottom: 1px solid var(--ink);
}

/* ---- team cards ---- */
.team-grid {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.team-card {
  padding: 1.4rem;
  border: 1px solid var(--border);
  position: relative;
  transition: transform 200ms ease, border-color 200ms ease;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.team-card:hover {
  transform: translateY(-4px);
  border-color: var(--line);
}

.team-code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--coral);
  border: 1px solid var(--border);
  padding: 0.25rem 0.5rem;
  margin-bottom: 0.9rem;
}

.team-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.team-card p {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* ---- reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ---- footer title block ---- */
.site-footer {
  padding: 2.5rem 0 3rem;
}

.title-block {
  border: 1px solid var(--line-soft);
}

.tb-row {
  border-bottom: 1px solid var(--line-soft);
}

.tb-row:last-child {
  border-bottom: none;
}

.tb-head {
  padding: 0.9rem 1.2rem;
}

.tb-project {
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  color: var(--text);
}

.tb-cells {
  display: grid;
  grid-template-columns: repeat(3, 1fr) 2fr;
}

.tb-cell {
  padding: 0.9rem 1.2rem;
  border-right: 1px solid var(--line-soft);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.tb-cell:last-child {
  border-right: none;
}

.tb-key {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.tb-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
}

.tb-contact {
  padding: 1.4rem 1.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.tb-contact-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
}

.tb-contact-text {
  color: var(--muted);
  margin: 0;
  max-width: 40ch;
}

.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;
}

@media (max-width: 860px) {
  .hero-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .tb-cells {
    grid-template-columns: repeat(2, 1fr);
  }

  .tb-cell {
    border-bottom: 1px solid var(--line-soft);
  }
}

@media (max-width: 760px) {
  .nav-links {
    display: none;
  }

  .controls {
    margin-left: auto;
  }

  .hero {
    padding-top: 3.2rem;
  }

  .frame {
    inset: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}