:root {
  --background: #101311;
  --panel: #181c19;
  --panel-deep: #0c0f0d;
  --text: #d8d6ca;
  --muted: #85877f;
  --line: rgba(216, 214, 202, 0.18);
  --line-strong: rgba(200, 184, 125, 0.55);
  --signal: #c8b87d;
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 65% 35%, rgba(103, 112, 101, 0.18), transparent 35%),
    linear-gradient(115deg, #0d100f 0%, #171b18 50%, #0b0e0d 100%);
}

body.modal-open { overflow: hidden; }
button { font: inherit; }
a { color: inherit; }

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.18em;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.signal {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--signal);
  font: 11px Consolas, monospace;
  letter-spacing: 0.16em;
  white-space: nowrap;
}

.signal-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 16px var(--signal);
}

/* Archive */
.archive-body { padding: 28px; }

.archive-shell {
  width: min(1200px, 100%);
  min-height: calc(100vh - 56px);
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 26px;
}

.archive-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.archive-intro {
  max-width: 620px;
  margin: 16px 0 0;
  color: #aaa99f;
  font-size: 14px;
  line-height: 1.8;
}

.artifact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-content: center;
}

.artifact-card {
  position: relative;
  min-height: 210px;
  padding: 26px;
  overflow: hidden;
  border: 1px solid var(--line);
  text-decoration: none;
  background:
    linear-gradient(rgba(210, 210, 195, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(210, 210, 195, 0.028) 1px, transparent 1px),
    linear-gradient(145deg, rgba(31, 36, 32, 0.9), rgba(12, 15, 13, 0.96));
  background-size: 36px 36px, 36px 36px, auto;
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.artifact-card::before,
.artifact-card::after {
  content: "";
  position: absolute;
  width: 30px;
  height: 30px;
  opacity: 0.8;
}

.artifact-card::before {
  top: 12px;
  left: 12px;
  border-top: 1px solid var(--signal);
  border-left: 1px solid var(--signal);
}

.artifact-card::after {
  right: 12px;
  bottom: 12px;
  border-right: 1px solid var(--signal);
  border-bottom: 1px solid var(--signal);
}

.artifact-card:hover,
.artifact-card:focus-visible {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  outline: none;
  box-shadow: 8px 8px 0 rgba(200, 184, 125, 0.08);
}

.artifact-card-wide { grid-column: 1 / -1; }

.card-index,
.card-status,
.card-action {
  font-family: Consolas, monospace;
  letter-spacing: 0.14em;
}

.card-index { color: var(--signal); font-size: 11px; }
.card-status { float: right; color: var(--muted); font-size: 10px; }
.artifact-card h2 { margin: 46px 0 9px; font-size: 25px; font-weight: 500; letter-spacing: 0.08em; }
.artifact-card p { margin: 0; color: var(--muted); font: 11px Consolas, monospace; letter-spacing: 0.12em; }
.card-action { position: absolute; right: 26px; bottom: 24px; color: var(--text); font-size: 11px; }

.archive-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font: 10px Consolas, monospace;
  letter-spacing: 0.14em;
}

/* Artifact viewer */
.artifact-body { padding: 24px; }

.artifact-page {
  width: min(1200px, 100%);
  min-height: calc(100vh - 48px);
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 16px;
}

.artifact-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.archive-link {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--muted);
  font: 10px Consolas, monospace;
  letter-spacing: 0.14em;
  text-decoration: none;
}

.archive-link:hover { color: var(--signal); }

.viewer {
  position: relative;
  min-height: 560px;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(rgba(210, 210, 195, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(210, 210, 195, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 50% 45%, #3b403a 0%, #1b201d 38%, #101311 78%);
  background-size: 54px 54px, 54px 54px, auto;
}

model-viewer {
  width: 100%;
  height: 100%;
  min-height: 560px;
  --poster-color: transparent;
  --progress-bar-color: var(--signal);
}

.loading-note {
  position: absolute;
  left: 50%;
  top: 50%;
  margin: 0;
  color: var(--muted);
  font: 11px Consolas, monospace;
  letter-spacing: 0.16em;
  transform: translate(-50%, -50%);
}

model-viewer.loaded + .loading-note { display: none; }

.corner { position: absolute; width: 34px; height: 34px; pointer-events: none; }
.corner-top { top: 18px; left: 18px; border-top: 1px solid var(--signal); border-left: 1px solid var(--signal); }
.corner-bottom { right: 18px; bottom: 18px; border-right: 1px solid var(--signal); border-bottom: 1px solid var(--signal); }
.help { position: absolute; left: 28px; bottom: 20px; margin: 0; color: var(--muted); font-size: 11px; letter-spacing: 0.16em; pointer-events: none; }

.action-button {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--signal);
  border-radius: 0;
  color: var(--text);
  background: linear-gradient(110deg, rgba(24, 28, 25, 0.96), rgba(12, 15, 13, 0.94));
  font-family: Consolas, "Microsoft YaHei", monospace;
  font-size: 13px;
  letter-spacing: 0.16em;
  box-shadow: 6px 6px 0 rgba(200, 184, 125, 0.14), inset 0 0 18px rgba(200, 184, 125, 0.04);
  cursor: pointer;
  transition: 160ms ease;
}

.action-button::before { content: "●"; margin-right: 10px; color: var(--signal); font-size: 8px; vertical-align: 2px; text-shadow: 0 0 10px var(--signal); }
.action-button:hover,
.action-button:focus-visible { color: #f1e6b8; background: rgba(31, 35, 31, 0.98); outline: none; box-shadow: 4px 4px 0 rgba(200, 184, 125, 0.24), inset 0 0 22px rgba(200, 184, 125, 0.08); }

.desktop-project { position: absolute; right: 28px; top: 24px; z-index: 8; padding: 13px 18px; }
.ar-button { position: absolute; left: 50%; bottom: 68px; z-index: 10; min-width: 190px; padding: 14px 22px; transform: translateX(-50%); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.ar-button:active { transform: translate(-50%, 2px); }

.artifact-footer {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

dl { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 0; }
dt { margin-bottom: 7px; color: var(--muted); font-size: 10px; letter-spacing: 0.16em; }
dd { margin: 0; font: 13px Consolas, monospace; }
blockquote { margin: 0; color: #aaa99f; font-size: 14px; line-height: 1.8; text-align: right; }

.protocol-warning {
  position: fixed;
  left: 18px;
  right: 18px;
  bottom: 18px;
  z-index: 120;
  display: none;
  padding: 14px 18px;
  border: 1px solid #b56f62;
  color: #f0d0c9;
  background: rgba(38, 17, 14, 0.96);
  font-size: 13px;
  line-height: 1.6;
}

.protocol-warning.show { display: block; }

/* QR modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(5, 7, 6, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 180ms ease, visibility 180ms ease;
}

.modal.is-open { opacity: 1; visibility: visible; }

.modal-panel {
  position: relative;
  width: min(760px, 100%);
  padding: 34px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(135deg, rgba(25, 29, 26, 0.98), rgba(10, 13, 11, 0.99));
  box-shadow: 14px 14px 0 rgba(200, 184, 125, 0.09);
}

.modal-panel::before,
.modal-panel::after { content: ""; position: absolute; width: 38px; height: 38px; pointer-events: none; }
.modal-panel::before { top: 14px; left: 14px; border-top: 1px solid var(--signal); border-left: 1px solid var(--signal); }
.modal-panel::after { right: 14px; bottom: 14px; border-right: 1px solid var(--signal); border-bottom: 1px solid var(--signal); }
.modal-grid { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 42px; align-items: center; }
.modal-grid > * { min-width: 0; }
.modal-kicker { margin: 0 0 14px; color: var(--signal); font: 11px Consolas, monospace; letter-spacing: 0.2em; }
.modal h2 { margin: 0 0 16px; font-size: 30px; font-weight: 500; letter-spacing: 0.08em; }
.modal-copy { margin: 0 0 24px; color: #aaa99f; font-size: 14px; line-height: 1.9; }
.steps { margin: 0; padding: 0; list-style: none; counter-reset: step; }
.steps li { counter-increment: step; margin: 12px 0; color: var(--text); font-size: 13px; letter-spacing: 0.04em; }
.steps li::before { content: "0" counter(step); display: inline-block; width: 32px; margin-right: 10px; color: var(--signal); font-family: Consolas, monospace; }
.qr-frame { display: grid; place-items: center; width: 250px; max-width: 100%; min-height: 250px; padding: 17px; overflow: hidden; background: #ecebdd; border: 1px solid var(--signal); box-shadow: 8px 8px 0 rgba(200, 184, 125, 0.13); }
#qrcode img,
#qrcode canvas { display: block; width: 216px !important; height: 216px !important; }
.qr-error { color: #2b2d29; font: 12px/1.6 Consolas, monospace; text-align: center; }
.close-modal { position: absolute; top: 18px; right: 18px; width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 0; color: var(--text); background: transparent; cursor: pointer; font: 20px/1 Consolas, monospace; }
.close-modal:hover { border-color: var(--signal); color: var(--signal); }
.url-line { margin: 18px 0 0; overflow: hidden; color: var(--muted); font: 10px Consolas, monospace; text-overflow: ellipsis; white-space: nowrap; }

@media (max-width: 700px) {
  .archive-body,
  .artifact-body { padding: 14px; }
  .archive-shell,
  .artifact-page { min-height: calc(100vh - 28px); }
  .archive-header,
  .artifact-header { align-items: flex-start; }
  .archive-header .signal,
  .artifact-header .signal { font-size: 8px; }
  .artifact-grid { grid-template-columns: 1fr; }
  .artifact-card-wide { grid-column: auto; }
  .archive-footer { flex-direction: column; }
  .viewer,
  model-viewer { min-height: 480px; }
  .desktop-project { display: none; }
  .artifact-footer { grid-template-columns: 1fr; }
  dl { grid-template-columns: repeat(2, 1fr); }
  blockquote { text-align: left; }
  .modal-grid { grid-template-columns: 1fr; }
  .modal-panel { padding: 30px 24px; }
  .qr-frame { min-height: 220px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}