:root {
  --bg: #e8edf2;
  --bg-deep: #d8e0e8;
  --surface: #ffffff;
  --surface-2: #f4f7fa;
  --surface-3: #edf2f6;
  --panel-dark: #17212b;
  --panel-dark-2: #202c38;
  --text: #10202f;
  --text-soft: #536475;
  --text-inverse: #eff4f8;
  --accent: #2d5d7b;
  --accent-2: #3e7a56;
  --border: #cad5df;
  --border-strong: #b5c2ce;
  --shadow: 0 10px 24px rgba(16, 32, 47, 0.08);
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 6px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, #f2f5f8 0%, var(--bg) 100%);
}

body {
  min-height: 100vh;
}

a {
  color: inherit;
}

.layout {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 20px 0 40px;
}

.hero {
  display: grid;
  gap: 10px;
  padding: 0 0 18px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}

.hero-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.eyebrow,
.section-kicker,
.hero-tag,
.viewer-select-label {
  margin: 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow,
.section-kicker {
  color: var(--accent);
}

.hero-tag {
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text-soft);
}

.hero h1,
.viewer-sidebar h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.04;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-copy,
.model-description,
.panel-meta,
.project-description {
  color: var(--text-soft);
  line-height: 1.5;
}

.hero-copy {
  max-width: 760px;
  margin: 0;
  font-size: 1rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.panel-header h2 {
  margin: 4px 0 0;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

.panel-meta {
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  white-space: nowrap;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.project-card {
  display: flex;
  flex-direction: column;
  min-height: 190px;
  padding: 18px;
  text-decoration: none;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  transition: background-color 120ms ease, border-color 120ms ease;
}

.project-card:hover,
.project-card:focus-visible {
  background: #f7fafc;
  border-color: var(--border-strong);
}

.project-card h3 {
  margin: 10px 0 8px;
  font-size: 1.18rem;
  line-height: 1.16;
  font-weight: 700;
}

.project-description {
  margin: 0;
}

.project-card-footer {
  margin-top: auto;
  padding-top: 16px;
  color: var(--accent);
  font-weight: 600;
}

.empty-state {
  padding: 28px 18px;
  color: var(--text-soft);
  text-align: center;
}

.viewer-page {
  display: grid;
  grid-template-columns: 340px 1fr;
  background: #d9e2ea;
  min-height: 100vh;
  min-height: 100dvh;
}

.viewer-sidebar {
  min-height: 100vh;
  padding: 18px;
  background:
    linear-gradient(180deg, var(--panel-dark) 0%, var(--panel-dark-2) 100%);
  color: var(--text-inverse);
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.viewer-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1 1 auto;
}

.viewer-panel[open] {
  display: flex;
}

.viewer-sidebar-bar {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
  list-style: none;
  cursor: default;
}

.viewer-sidebar-bar::-webkit-details-marker {
  display: none;
}

.viewer-sidebar-heading {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.viewer-sidebar-details {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
  flex: 1 1 auto;
}

.viewer-sidebar-top {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.viewer-panel-toggle {
  display: none;
  padding: 7px 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-inverse);
  font: inherit;
}

.back-link {
  width: fit-content;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.04);
  text-decoration: none;
  color: rgba(239, 244, 248, 0.92);
}

.viewer-select-label {
  color: rgba(239, 244, 248, 0.62);
}

.viewer-select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-inverse);
  font: inherit;
}

.viewer-select option {
  color: var(--text);
}

.model-description {
  color: rgba(239, 244, 248, 0.72);
  margin: 0;
}

.status-box {
  margin-top: auto;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(98, 136, 169, 0.32);
  background: rgba(45, 93, 123, 0.16);
  color: rgba(239, 244, 248, 0.92);
}

#cesiumContainer {
  width: 100%;
  height: 100vh;
  height: 100dvh;
  border-left: 1px solid rgba(16, 32, 47, 0.08);
}

.cesium-viewer-toolbar {
  top: 12px;
  right: 12px;
  padding: 6px;
  border: 1px solid rgba(16, 32, 47, 0.12);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 8px 18px rgba(16, 32, 47, 0.14);
}

.cesium-button {
  border-radius: 6px !important;
  border: 1px solid rgba(16, 32, 47, 0.1) !important;
  background: #ffffff !important;
}

.cesium-button:hover {
  background: #f1f5f8 !important;
}

@media (max-width: 900px) {
  .layout {
    width: min(100%, calc(100% - 20px));
    padding: 16px 0 28px;
  }

  .hero-bar,
  .panel-header {
    flex-direction: column;
    align-items: start;
  }

  .viewer-page {
    display: block;
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
  }

  .viewer-sidebar {
    position: absolute;
    z-index: 20;
    top: 10px;
    left: 10px;
    right: 10px;
    min-height: auto;
    padding: 12px;
    gap: 10px;
    border-right: 0;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    background: rgba(23, 33, 43, 0.88);
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 24px rgba(16, 32, 47, 0.28);
  }

  .viewer-sidebar-bar {
    align-items: center;
    cursor: pointer;
  }

  .viewer-sidebar-heading {
    gap: 2px;
  }

  .viewer-sidebar h1 {
    font-size: 1.35rem;
    line-height: 1.08;
  }

  .viewer-panel-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
  }

  .viewer-sidebar-details {
    display: none;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }

  .viewer-panel[open] .viewer-sidebar-details {
    display: flex;
  }

  .viewer-sidebar-top {
    gap: 6px;
    padding-bottom: 8px;
  }

  .model-description {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 0.95rem;
  }

  .viewer-select {
    padding: 9px 10px;
  }

  .status-box {
    margin-top: 0;
    padding: 10px 11px;
    font-size: 0.92rem;
  }

  #cesiumContainer {
    height: 100vh;
    height: 100dvh;
    border-left: 0;
  }

  .cesium-viewer-toolbar {
    top: auto;
    bottom: 14px;
    right: 12px;
  }
}

@media (max-width: 560px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .panel-header {
    padding: 14px 14px;
  }

  .project-card {
    min-height: 170px;
    padding: 15px;
  }

  .viewer-sidebar {
    top: 8px;
    left: 8px;
    right: 8px;
    padding: 10px;
  }

  .back-link {
    padding: 6px 8px;
  }

  .viewer-sidebar h1 {
    font-size: 1.2rem;
  }

  .eyebrow,
  .section-kicker,
  .hero-tag,
  .viewer-select-label {
    font-size: 0.68rem;
  }
}