/* =============================================================
   COMPONENTS — nav, footer, buttons, cards, tags, timeline
   ============================================================= */

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: rgba(6, 10, 18, 0.55);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out);
}

.nav.is-scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(6, 10, 18, 0.82);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  color: var(--color-text);
  flex-shrink: 0;
}

.nav__brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-s);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-cyan);
  background: var(--color-cyan-dim);
  position: relative;
  transform: rotate(45deg);
}

.nav__brand-mark span {
  transform: rotate(-45deg);
  display: block;
}

.nav__brand-text {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav__brand-text span {
  color: var(--color-cyan);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0 auto;
  padding: 0;
}

.nav__link {
  position: relative;
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
  transition: color var(--dur-fast) var(--ease-out);
}

.nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-cyan);
  transition: width var(--dur-base) var(--ease-out);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--color-text);
}

.nav__link:hover::before,
.nav__link.is-active::before {
  width: 100%;
}

.nav__link.is-active {
  color: var(--color-cyan);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

.nav__status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.nav__status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-green-signal);
  box-shadow: 0 0 0 0 rgba(109, 255, 176, 0.6);
  animation: pulse-dot 2.4s var(--ease-in-out) infinite;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  background: transparent;
  cursor: pointer;
  padding: 0;
}

.nav__toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin-inline: auto;
  background: var(--color-text);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav__links .nav__link-cta {
  display: none;
}

@media (max-width: 900px) {
  .nav__links {
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    display: none;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    gap: var(--space-5);
    padding: var(--space-7) var(--container-pad);
    background: rgba(6, 10, 18, 0.97);
    backdrop-filter: blur(16px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-base) var(--ease-out);
    margin: 0;
    border-left: 1px solid var(--color-border);
    overflow-x: hidden;
  }

  .nav__links.is-open {
    display: flex;
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    font-size: var(--fs-body-l);
    font-family: var(--font-display);
    text-transform: none;
    letter-spacing: 0.02em;
  }

  .nav__status {
    display: none;
  }

  .nav__toggle {
    display: flex;
  }

  .nav .btn--nav-cta {
    display: none;
  }

  .nav__links .nav__link-cta {
    display: inline-flex;
    margin-top: var(--space-3);
  }
}

/* ---------- 3D scene fallback ---------- */
[data-scene-wrapper].scene-fallback canvas {
  display: none;
}

[data-scene-wrapper].scene-fallback::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 65% 35%, var(--color-cyan-dim), transparent 55%),
    radial-gradient(circle at 30% 75%, var(--color-violet-dim), transparent 60%);
}

[data-scene-wrapper].scene-fallback::after {
  content: "";
  position: absolute;
  inset: 12% 8%;
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-l);
  opacity: 0.4;
}

/* ---------- Buttons ---------- */
.btn {
  --btn-fg: var(--color-text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-s);
  border: 1px solid var(--color-border-strong);
  background: transparent;
  color: var(--btn-fg);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
    background var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out);
  white-space: nowrap;
}

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

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--color-cyan);
  border-color: var(--color-cyan);
  color: var(--color-text-on-accent);
  font-weight: 600;
}

.btn--primary:hover {
  box-shadow: var(--glow-cyan);
  background: var(--color-cyan-bright);
  border-color: var(--color-cyan-bright);
}

.btn--ghost {
  border-color: transparent;
  color: var(--color-text-muted);
}

.btn--ghost:hover {
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.btn--sm {
  padding: var(--space-3) var(--space-5);
  font-size: 0.7rem;
}

.btn--icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-s);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ---------- Section heading ---------- */
.section {
  padding-block: var(--space-9);
  position: relative;
}

.section--tight {
  padding-block: var(--space-7);
}

.section__head {
  max-width: 760px;
  margin-bottom: var(--space-7);
}

.section__head--center {
  margin-inline: auto;
  text-align: center;
}

.section__title {
  font-size: var(--fs-display-l);
  margin-top: var(--space-3);
}

.section__lede {
  margin-top: var(--space-4);
  font-size: var(--fs-body-l);
  max-width: 60ch;
}

.section__head--center .section__lede {
  margin-inline: auto;
}

.section__index {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  color: var(--color-text-dim);
  letter-spacing: 0.2em;
}

/* ---------- Corner-frame panel (HUD card) ---------- */
.frame {
  position: relative;
  border: 1px solid var(--color-border);
  background: linear-gradient(165deg, var(--color-surface), var(--color-surface-2));
  border-radius: var(--radius-m);
}

.frame::before,
.frame::after,
.frame > .frame__corner-tl,
.frame > .frame__corner-br {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-cyan);
  opacity: 0.55;
  transition: opacity var(--dur-base) var(--ease-out);
}

.frame::before {
  top: -1px;
  left: -1px;
  border-right: none;
  border-bottom: none;
}

.frame::after {
  bottom: -1px;
  right: -1px;
  border-left: none;
  border-top: none;
}

.frame:hover::before,
.frame:hover::after {
  opacity: 1;
}

/* ---------- Tag / badge ---------- */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.02);
}

.tag--cyan {
  color: var(--color-cyan);
  border-color: rgba(46, 230, 214, 0.3);
  background: var(--color-cyan-dim);
}

.tag--amber {
  color: var(--color-amber);
  border-color: rgba(255, 180, 84, 0.3);
  background: var(--color-amber-dim);
}

.tag--violet {
  color: var(--color-violet);
  border-color: rgba(180, 139, 255, 0.3);
  background: var(--color-violet-dim);
}

/* ---------- Pill stat ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  background: var(--color-surface);
}

.stat__value {
  font-family: var(--font-display);
  font-size: var(--fs-display-s);
  font-weight: 700;
  color: var(--color-cyan);
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.stat__label {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- Card ---------- */
.card {
  display: flex;
  flex-direction: column;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  background: var(--color-surface);
  transition: transform var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
  height: 100%;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-lift);
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-7);
  padding-left: var(--space-7);
  border-left: 1px dashed var(--color-border-strong);
}

.timeline__item {
  position: relative;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: calc(var(--space-7) * -1 - 5px);
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-cyan);
  box-shadow: 0 0 0 4px var(--color-bg), 0 0 14px rgba(46, 230, 214, 0.5);
}

.timeline__period {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  color: var(--color-cyan);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.timeline__title {
  margin-top: var(--space-2);
  font-size: var(--fs-display-s);
}

.timeline__org {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--fs-body-s);
  color: var(--color-text-muted);
}

.timeline__body {
  margin-top: var(--space-3);
  max-width: 70ch;
}

.timeline__body p + p {
  margin-top: var(--space-3);
}

.timeline__body ul {
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
}

.timeline__body li {
  position: relative;
  padding-left: var(--space-5);
  color: var(--color-text-muted);
}

.timeline__body li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-cyan);
}

/* ---------- Footer ---------- */
.footer {
  position: relative;
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-9);
  padding-block: var(--space-8) var(--space-6);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-8);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 360px;
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: var(--fs-display-s);
}

.footer__heading {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__links a {
  color: var(--color-text-muted);
  font-size: var(--fs-body-s);
  transition: color var(--dur-fast) var(--ease-out);
}

.footer__links a:hover {
  color: var(--color-cyan);
}

.footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  color: var(--color-text-dim);
}

.footer__bottom a {
  color: var(--color-text-dim);
}

.footer__bottom a:hover {
  color: var(--color-cyan);
}

.social-row {
  display: flex;
  gap: var(--space-3);
}

.social-row a {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  color: var(--color-text-muted);
  transition: color var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}

.social-row a:hover {
  color: var(--color-cyan);
  border-color: var(--color-border-accent);
  transform: translateY(-3px);
}

.social-row svg {
  width: 18px;
  height: 18px;
}

@media (max-width: 800px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-7);
  }
}

/* ---------- Back to top ---------- */
.to-top {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  z-index: var(--z-overlay);
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-s);
  border: 1px solid var(--color-border-strong);
  background: rgba(13, 20, 34, 0.85);
  backdrop-filter: blur(10px);
  color: var(--color-cyan);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}

.to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.to-top:hover {
  border-color: var(--color-border-accent);
  box-shadow: var(--glow-cyan);
}

/* ---------- Breadcrumb / page header ---------- */
.page-header {
  padding-top: calc(var(--nav-height) + var(--space-8));
  padding-bottom: var(--space-8);
  position: relative;
  overflow: hidden;
}

.page-header__crumbs {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.page-header__crumbs a {
  color: var(--color-text-dim);
}

.page-header__crumbs a:hover {
  color: var(--color-cyan);
}

.page-header__title {
  margin-top: var(--space-4);
  font-size: var(--fs-display-xl);
}

.page-header__lede {
  margin-top: var(--space-5);
  font-size: var(--fs-body-l);
  max-width: 64ch;
}

/* ---------- Filter bar ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-strong);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--dur-base) var(--ease-out);
}

.filter-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border-accent);
}

.filter-btn.is-active {
  color: var(--color-text-on-accent);
  background: var(--color-cyan);
  border-color: var(--color-cyan);
}

/* ---------- Divider ---------- */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-strong), transparent);
  margin-block: var(--space-8);
}

/* ---------- CTA panel ---------- */
.cta__panel {
  max-width: 780px;
  margin-inline: auto;
  padding: var(--space-9) var(--space-7);
  text-align: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  background:
    radial-gradient(circle at 50% 0%, var(--color-cyan-dim), transparent 65%),
    var(--color-surface);
}

.cta__title {
  margin-inline: auto;
}

.cta__panel .section__lede {
  margin-inline: auto;
}

@media (max-width: 600px) {
  .cta__panel {
    padding: var(--space-7) var(--space-5);
  }
}

/* ---------- Arrow link ---------- */
.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-cyan);
  transition: gap var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
}

.project-card__link:hover {
  gap: var(--space-3);
  color: var(--color-text);
}

.project-card__link svg {
  transition: transform var(--dur-base) var(--ease-out);
}

.project-card__link:hover svg {
  transform: translateX(2px);
}