/* Cratos — full-width docs, red accent */

:root {
  --bg: #0a0a0a;
  --fg: #d8d8d8;
  --dim: #6b6b6b;
  --red: #c41e28;
  --red-dim: #8a1520;
  --line: #2e2e2e;
  --line-accent: #3d1519;
  --mono: "JetBrains Mono", "Consolas", "Courier New", monospace;
  --pad-x: clamp(1.25rem, 4vw, 3.5rem);
  --img-max: min(100%, 22rem);
  --img-pcb-layout: min(100%, 13rem);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--red-dim);
  color: #fff;
}

a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--red);
  text-underline-offset: 3px;
}

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

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

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: var(--pad-x);
  top: 1rem;
  z-index: 99;
  background: var(--bg);
  padding: 0.5rem;
}

/* —— motion —— */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(1.25rem);
    transition:
      opacity 0.65s var(--ease),
      transform 0.65s var(--ease);
  }

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

  .text-reveal {
    opacity: 0;
    transform: translateY(0.65rem);
    transition:
      opacity 0.5s var(--ease),
      transform 0.5s var(--ease);
  }

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

  .intro__hero {
    animation: fadeDown 0.85s var(--ease) both;
  }

  .top {
    transition:
      transform 0.4s var(--ease),
      background 0.35s ease,
      border-color 0.35s ease,
      box-shadow 0.35s ease;
  }

  .top.is-scrolled {
    background: rgba(10, 10, 10, 0.92);
    backdrop-filter: blur(10px);
    border-bottom-color: var(--line-accent);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  }

  .intro__logo {
    transition: transform 0.5s var(--ease);
  }

  .intro__hero:hover .intro__logo {
    transform: scale(1.03);
  }

  .top__brand img {
    transition: transform 0.4s var(--ease);
  }

  .top__brand:hover img {
    transform: scale(1.05);
  }

  .top nav a {
    position: relative;
    transition: color 0.25s ease;
  }

  .top nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.2rem;
    width: 0;
    height: 1px;
    background: var(--red);
    transition: width 0.3s var(--ease);
  }

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

  .toggle summary {
    transition: color 0.25s ease, padding-left 0.3s var(--ease);
  }

  .toggle[open] summary {
    padding-left: 0.35rem;
  }

  .toggle__body {
    animation: fadeIn 0.45s var(--ease) both;
  }

  .figure img {
    transition:
      transform 0.4s var(--ease),
      border-color 0.35s ease,
      box-shadow 0.4s ease;
  }

  .figure:hover img {
    transform: scale(1.02);
    border-color: var(--red-dim);
    box-shadow: 0 12px 40px rgba(196, 30, 40, 0.12);
  }

  .divider--accent {
    transform: scaleX(0.3);
    transform-origin: left;
    transition: transform 0.8s var(--ease);
  }

  .divider--accent.is-visible {
    transform: scaleX(1);
  }
}

@keyframes fadeDown {
  from {
    opacity: 0;
    transform: translateY(-0.75rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .text-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .top.is-hidden {
    transform: none;
    pointer-events: auto;
  }
}

/* —— header —— */
.top {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  padding: 1.15rem var(--pad-x);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem 1.5rem;
}

.top__brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.top__brand img {
  height: clamp(2.75rem, 5vw, 3.5rem);
  width: auto;
}

.top nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 0.5rem 1.5rem;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  flex: 1;
  min-width: 0;
}

.top nav a {
  color: var(--dim);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.top nav a:hover {
  color: var(--red);
}

.lang-toggle {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--line);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  flex-shrink: 0;
  letter-spacing: 0.04em;
}

.lang-toggle:hover {
  color: var(--red);
  border-color: var(--red-dim);
}

.flight-frame {
  width: 100%;
  border: 1px solid var(--line);
  margin: 1rem 0 2rem;
  background: #0a0a0a;
}

.flight-frame--3d {
  height: min(92vh, 920px);
}

.flight-frame--chart {
  height: 460px;
  margin-bottom: 2.5rem;
}

.flight-frame--chart-bode {
  height: 560px;
}

.flight-charts-embed h4 {
  margin: 2rem 0 0.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--red);
  letter-spacing: 0.03em;
}

.flight-telemetry-gallery {
  display: grid;
  gap: 1.5rem;
  margin: 1.25rem 0 2.5rem;
}

@media (min-width: 900px) {
  .flight-telemetry-gallery {
    grid-template-columns: 1fr 1fr;
  }
}

.flight-telemetry-shot {
  margin: 0;
}

.flight-telemetry-shot img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  display: block;
}

.flight-telemetry-shot figcaption {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.press-figure {
  margin: 1.25rem 0 2rem;
  max-width: 52rem;
}

.press-figure a {
  display: block;
  text-decoration: none;
}

.press-figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  display: block;
  transition: border-color 0.2s var(--ease);
}

.press-figure a:hover img {
  border-color: var(--red-dim);
}

.press-figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.45;
}

.flight-stats {
  max-width: 28rem;
  margin: 0 0 1.5rem;
}

.flight-stats th {
  color: var(--red);
  font-weight: 500;
  width: 55%;
}

.flight-charts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.flight-charts li {
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--line);
}

.flight-charts a {
  text-decoration: none;
}

.flight-charts a:hover {
  color: var(--red);
}

.flight-method {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.flight-method h4 {
  margin: 1.75rem 0 0.65rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--red);
  letter-spacing: 0.03em;
}

.flight-pipeline {
  font-family: var(--mono, ui-monospace, monospace);
  font-size: 0.8rem;
  line-height: 1.45;
  padding: 1rem 1.1rem;
  margin: 0.75rem 0 1.25rem;
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.6);
  overflow-x: auto;
  white-space: pre;
}

.flight-method .formula {
  font-family: var(--mono, ui-monospace, monospace);
  font-size: 0.95rem;
  margin: 0.5rem 0 0.75rem;
  color: var(--text);
}

.flight-conclusions {
  margin: 0.75rem 0 0;
  padding-left: 1.25rem;
}

.flight-conclusions li {
  margin-bottom: 0.85rem;
  line-height: 1.55;
}

/* —— layout —— */
.doc {
  width: 100%;
  max-width: none;
  padding: 2.5rem var(--pad-x) 5rem;
}

.divider {
  border: none;
  height: 1px;
  background: var(--line);
  margin: 3rem 0;
}

.divider--accent {
  background: var(--red);
  opacity: 0.35;
}

.intro {
  width: 100%;
}

.intro__hero {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem 2.5rem;
  margin-bottom: 1.75rem;
}

.intro__logo {
  height: clamp(6.5rem, 18vw, 10.5rem);
  width: auto;
  flex-shrink: 0;
}

.intro__titles {
  flex: 1;
  min-width: min(100%, 16rem);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 500;
  color: #fff;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 500;
  color: #fff;
  margin: 0 0 1.25rem;
  letter-spacing: -0.01em;
  border-left: 3px solid var(--red);
  padding-left: 0.85rem;
}

h3 {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  font-weight: 500;
  color: var(--red);
  margin: 2rem 0 0.85rem;
}

.meta {
  color: var(--dim);
  margin: 0 0 1.75rem;
  font-size: 0.85rem;
}

.meta span::after {
  content: " · ";
  color: var(--line);
}

.meta span:last-child::after {
  content: "";
}

p {
  margin: 0 0 1rem;
  max-width: 52rem;
}

ul {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
  max-width: 52rem;
}

ul li {
  margin-bottom: 0.4rem;
}

ul li::marker {
  color: var(--red);
}

.chain {
  margin: 1rem 0 1.25rem;
  color: var(--dim);
  font-size: 0.85rem;
  max-width: 56rem;
}

.chain strong {
  color: var(--fg);
  font-weight: 500;
}

.kv {
  margin: 1.25rem 0 1.75rem;
  max-width: 40rem;
}

.kv dt {
  color: var(--red);
  font-weight: 500;
  margin-top: 0.65rem;
}

.kv dd {
  margin: 0.2rem 0 0 0;
  color: var(--fg);
}

/* —— collapsible —— */
.toggle {
  margin: 1.5rem 0 2rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.toggle + .toggle {
  margin-top: -1px;
}

.toggle summary {
  cursor: pointer;
  list-style: none;
  padding: 1rem 0;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--fg);
  user-select: none;
}

.toggle summary::-webkit-details-marker {
  display: none;
}

.toggle summary::before {
  content: "+ ";
  color: var(--red);
  font-weight: 500;
}

.toggle[open] summary::before {
  content: "− ";
}

.toggle summary:hover {
  color: var(--red);
}

.toggle__body {
  padding: 0 0 1.5rem;
}

/* —— images (smaller; logo excluded via .brand) —— */
.fig-gallery {
  display: grid;
  gap: 1.25rem 1.5rem;
  grid-template-columns: 1fr;
}

.figure {
  margin: 0;
}

.figure img {
  border: 1px solid var(--line);
  width: 100%;
  max-width: var(--img-max);
  margin-inline: auto;
}

.figure--layout img {
  max-width: var(--img-pcb-layout);
}

.figure--layout .fig-label {
  max-width: var(--img-pcb-layout);
}

.fig-label {
  display: block;
  margin-top: 0.5rem;
  color: var(--dim);
  font-size: 0.75rem;
  max-width: var(--img-max);
  margin-inline: auto;
  text-align: center;
}

.fig-label strong {
  color: var(--red);
  font-weight: 500;
}

/* wide laptop: side by side */
@media (min-width: 900px) {
  .fig-gallery--2 {
    grid-template-columns: repeat(2, 1fr);
    align-items: start;
  }

  .fig-gallery--3 {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }

  .fig-gallery--2 .figure:not(.figure--layout) img,
  .fig-gallery--3 .figure img {
    max-width: 100%;
  }

  .fig-gallery--2 .figure:not(.figure--layout) .fig-label,
  .fig-gallery--3 .fig-label {
    max-width: 100%;
  }

  .fig-gallery--2 .figure--layout img {
    max-width: var(--img-pcb-layout);
  }
}

/* medium: 3-up becomes 2+1 */
@media (min-width: 600px) and (max-width: 899px) {
  .fig-gallery--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .fig-gallery--3 .figure:last-child {
    grid-column: 1 / -1;
  }

  .fig-gallery--3 .figure:last-child img {
    max-width: var(--img-max);
  }
}

.placeholder {
  margin: 1rem 0 0;
  padding: 1.25rem 1.5rem;
  border: 1px dashed var(--line-accent);
  color: var(--dim);
  font-size: 0.82rem;
  max-width: 40rem;
}

.placeholder strong {
  color: var(--red);
  font-weight: 500;
}

/* component table */
.table-wrap {
  overflow-x: auto;
  margin: 1rem 0 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

th,
td {
  text-align: left;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--line);
}

th {
  color: var(--red);
  font-weight: 500;
}

td {
  color: var(--fg);
}

.bom-table td:nth-child(3),
.bom-table td:nth-child(4),
.bom-table th:nth-child(3),
.bom-table th:nth-child(4) {
  text-align: right;
  white-space: nowrap;
}

.bom-table tfoot th {
  text-align: right;
  font-weight: 500;
}

.bom-total td {
  background: rgba(251, 191, 36, 0.12);
}

.bom-flight td {
  background: rgba(74, 222, 128, 0.1);
}

.footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.8rem;
}

.section-block {
  margin-bottom: 0.5rem;
}

.team-list {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  max-width: 36rem;
}

.team-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.15rem 0.5rem;
}

.team-list li:last-child {
  border-bottom: none;
}

.team-name {
  color: var(--fg);
  font-weight: 500;
}

.team-meta {
  color: var(--dim);
  font-size: 0.82rem;
}

.team-meta::before {
  content: " · ";
}

.team-role {
  flex: 1 1 100%;
  color: var(--red);
  font-size: 0.8rem;
  margin-top: 0.15rem;
}

.team-list--teachers,
.team-list--thanks {
  margin-bottom: 0;
}

.team-list--thanks .team-role {
  color: var(--dim);
}

@media (max-width: 768px) {
  .top {
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-areas:
      "brand . lang"
      "nav nav nav";
    align-items: center;
    padding: 0.85rem var(--pad-x);
    gap: 0.6rem 0.5rem;
    will-change: transform;
  }

  .top.is-hidden {
    transform: translateY(-100%);
    pointer-events: none;
  }

  .top__brand {
    grid-area: brand;
    justify-content: flex-start;
  }

  .lang-toggle {
    grid-area: lang;
    justify-self: end;
  }

  .top nav {
    grid-area: nav;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.4rem 0.5rem;
    width: 100%;
    font-size: 0.78rem;
    flex: none;
  }

  .top nav a {
    text-align: center;
    padding: 0.45rem 0.35rem;
    line-height: 1.25;
    border: 1px solid var(--line);
  }

  .top nav a:hover {
    border-color: var(--red-dim);
  }

  .flight-frame--3d {
    height: min(70vh, 640px);
  }

  .flight-frame--chart {
    height: 380px;
  }

  .flight-frame--chart-bode {
    height: 460px;
  }
}

@media (max-width: 380px) {
  .top nav {
    grid-template-columns: repeat(2, 1fr);
    font-size: 0.72rem;
  }
}