*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #f2f2f2;
  --bg-surface: #ffffff;
  --text-accent: #ee0000;
  --text-primary: #000000;
  --text-secondary: #555555;
  --gfx-accent: #ee0000;
  --gfx-light: #ffffff;
  --gfx-dark: #000000;
  --border: #d2d2d2;
  --border-light: #e8e8e8;
  --hover-bg: #e8e8e8;
  --node-empty-fill: #ffffff;
  --node-empty-stroke: #cccccc;
  --tooltip-bg: #000000;
  --tooltip-text: #ffffff;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --radius: 8px;
  --transition: 0.25s ease;
}

[data-theme="dark"] {
  --bg-primary: #000000;
  --bg-surface: #292929;
  --text-accent: #ee0000;
  --text-primary: #ffffff;
  --text-secondary: #aaaaaa;
  --gfx-accent: #ee0000;
  --gfx-light: #ffffff;
  --gfx-dark: #000000;
  --border: #444444;
  --border-light: #3a3a3a;
  --hover-bg: #3a3a3a;
  --node-empty-fill: #292929;
  --node-empty-stroke: #555555;
  --tooltip-bg: #ffffff;
  --tooltip-text: #000000;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

html {
  font-size: 16px;
}

body {
  font-family: "Red Hat Text", system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* ── Header ───────────────────────────────────── */

header {
  background: var(--bg-surface);
  color: var(--text-primary);
  text-align: center;
  padding: 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
  position: relative;
  transition: background var(--transition), border-color var(--transition);
}

header h1 {
  font-family: "Red Hat Text", system-ui, sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-accent);
}

/* ── Theme Toggle ─────────────────────────────── */

#theme-toggle {
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.45rem;
  cursor: pointer;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

#theme-toggle:hover {
  border-color: var(--text-accent);
  color: var(--text-accent);
}

.icon-moon {
  display: none;
}

[data-theme="dark"] .icon-sun {
  display: none;
}

[data-theme="dark"] .icon-moon {
  display: block;
}

/* ── Main Layout ──────────────────────────────── */

main {
  display: flex;
  gap: 1.5rem;
  max-width: 1320px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
  align-items: flex-start;
}

/* ── Verify Box ───────────────────────────────── */

.verify-box {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.verify-box label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.verify-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.verify-row input {
  flex: 1 1 100%;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: "Red Hat Mono", monospace;
  background: var(--bg-primary);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}

.verify-row input:focus {
  border-color: var(--text-accent);
}

.verify-row input::placeholder {
  color: var(--text-secondary);
}

.verify-row button {
  padding: 0.55rem 0.85rem;
  font-family: "Red Hat Text", system-ui, sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
  transition: opacity var(--transition);
}

.verify-row button:hover {
  opacity: 0.85;
}

.verify-row button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#verify-btn {
  background: var(--text-accent);
  color: #ffffff;
}

#transcript-btn {
  background: var(--text-primary);
  color: var(--bg-surface);
}

.verify-status {
  font-size: 0.8rem;
  margin-top: 0.5rem;
  line-height: 1.4;
  min-height: 0;
}

.verify-status:empty {
  display: none;
}

.verify-status.error {
  color: var(--text-accent);
}

.verify-status.success {
  color: #3e8635;
}

.verify-status.loading {
  color: var(--text-secondary);
}

.verify-owner {
  font-size: 0.88rem;
  font-weight: 500;
  margin-top: 0.4rem;
  color: var(--text-primary);
}

.verify-owner:empty {
  display: none;
}

/* ── Exam Panel ───────────────────────────────── */

#exam-panel {
  flex: 0 0 380px;
  background: var(--bg-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  position: sticky;
  top: 1.5rem;
  max-height: calc(100vh - 3rem);
  display: flex;
  flex-direction: column;
  transition: background var(--transition), box-shadow var(--transition);
}

.panel-header {
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border);
}

.panel-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.panel-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

#exam-search {
  width: 100%;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: "Red Hat Text", system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

#exam-search:focus {
  border-color: var(--text-accent);
}

#exam-search::placeholder {
  color: var(--text-secondary);
}

#exam-list {
  overflow-y: auto;
  flex: 1;
  padding: 0.5rem 0;
}

/* Product group */

.exam-group {
  border-bottom: 1px solid var(--border-light);
}

.exam-group:last-child {
  border-bottom: none;
}

.group-toggle {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.7rem 1.25rem;
  border: none;
  background: none;
  cursor: pointer;
  font-family: "Red Hat Text", system-ui, sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  gap: 0.5rem;
  transition: background var(--transition);
}

.group-toggle:hover {
  background: var(--hover-bg);
}

.group-toggle .chevron {
  display: inline-block;
  width: 0.45rem;
  height: 0.45rem;
  border-right: 2px solid var(--text-secondary);
  border-bottom: 2px solid var(--text-secondary);
  transform: rotate(45deg);
  transition: transform var(--transition);
  flex-shrink: 0;
}

.exam-group.collapsed .chevron {
  transform: rotate(-45deg);
}

.group-exams {
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.exam-group.collapsed .group-exams {
  max-height: 0 !important;
}

.exam-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.5rem 1.25rem 0.5rem 2rem;
  cursor: pointer;
  transition: background var(--transition);
  user-select: none;
}

.exam-item:hover {
  background: var(--hover-bg);
}

.exam-item.hidden {
  display: none;
}

.exam-item input[type="checkbox"] {
  accent-color: var(--text-accent);
  margin-top: 0.2rem;
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  cursor: pointer;
}

.exam-item label {
  cursor: pointer;
  font-size: 0.88rem;
  line-height: 1.4;
}

.exam-item label .exam-code {
  font-family: "Red Hat Mono", monospace;
  font-weight: 600;
  color: var(--text-primary);
}

.exam-item label .exam-name {
  color: var(--text-secondary);
}

.panel-actions {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border);
}

#clear-all {
  padding: 0.45rem 1rem;
  font-family: "Red Hat Text", system-ui, sans-serif;
  font-size: 0.82rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition);
}

#clear-all:hover {
  border-color: var(--text-accent);
  color: var(--text-accent);
}

/* ── Map Panel ────────────────────────────────── */

#map-panel {
  flex: 1;
  background: var(--bg-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  min-width: 0;
  transition: background var(--transition), box-shadow var(--transition);
}

#map-panel h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.product-row {
  margin-bottom: 1.5rem;
}

.product-row:last-child {
  margin-bottom: 0;
}

.product-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.product-row svg {
  display: block;
  width: 100%;
  overflow: visible;
}

/* SVG styles */

.level-node {
  transition: fill var(--transition), stroke var(--transition), filter var(--transition);
}

.level-node.achieved {
  fill: var(--gfx-accent);
  stroke: var(--gfx-accent);
  filter: drop-shadow(0 0 6px rgba(238, 0, 0, 0.3));
}

.level-node.not-achieved {
  fill: var(--node-empty-fill);
  stroke: var(--node-empty-stroke);
}

.level-node.partial {
  fill: var(--node-empty-fill);
  stroke: #e67e22;
}

.partial-fill {
  fill: #e67e22;
  opacity: 0.85;
}

.level-label.partial {
  fill: #e67e22;
  font-weight: 500;
}

.level-connector {
  stroke: var(--node-empty-stroke);
  transition: stroke var(--transition);
}

.level-connector.achieved {
  stroke: var(--gfx-accent);
}

.level-connector-hover {
  stroke: transparent;
  cursor: pointer;
}

.level-label {
  font-family: "Red Hat Text", system-ui, sans-serif;
  font-size: 11px;
  fill: var(--text-secondary);
  text-anchor: middle;
}

.level-label.achieved {
  fill: var(--gfx-accent);
  font-weight: 600;
}

.arrowhead {
  fill: var(--node-empty-stroke);
  transition: fill var(--transition);
}

.arrowhead.achieved {
  fill: var(--gfx-accent);
}

/* ── Tooltip ──────────────────────────────────── */

.tooltip {
  position: fixed;
  z-index: 1000;
  background: var(--tooltip-bg);
  color: var(--tooltip-text);
  font-size: 0.82rem;
  line-height: 1.45;
  padding: 0.6rem 0.85rem;
  border-radius: 6px;
  max-width: 280px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

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

/* ── Footer ───────────────────────────────────── */

footer {
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

footer a {
  color: var(--text-accent);
  text-decoration: none;
  font-weight: 500;
}

footer a:hover {
  text-decoration: underline;
}

/* ── Responsive ───────────────────────────────── */

@media (max-width: 860px) {
  main {
    flex-direction: column;
  }

  #exam-panel {
    flex: none;
    width: 100%;
    position: static;
    max-height: none;
  }

  #exam-list {
    max-height: 40vh;
  }

  #map-panel {
    width: 100%;
  }
}

@media (max-width: 600px) {
  header {
    padding: 1rem 3rem 1rem 1rem;
  }

  header h1 {
    font-size: 1.2rem;
    text-align: left;
  }

  #theme-toggle {
    right: 0.75rem;
  }

  main {
    padding: 0 0.5rem;
    margin: 0.5rem auto;
    gap: 0.5rem;
  }

  .verify-box {
    padding: 1rem;
  }

  .verify-row button {
    flex: 1 1 calc(50% - 0.25rem);
    font-size: 0.75rem;
    padding: 0.5rem 0.5rem;
  }

  .panel-header {
    padding: 1rem;
  }

  .panel-subtitle {
    font-size: 0.78rem;
  }

  .exam-item {
    padding: 0.5rem 1rem 0.5rem 1.5rem;
  }

  .exam-item label {
    font-size: 0.82rem;
  }

  .group-toggle {
    padding: 0.6rem 1rem;
    font-size: 0.8rem;
  }

  #exam-list {
    max-height: 35vh;
  }

  #map-panel {
    padding: 1rem;
  }

  #map-panel h2 {
    font-size: 1rem;
    margin-bottom: 1rem;
  }

  .product-label {
    font-size: 0.78rem;
  }

  .product-row {
    margin-bottom: 1rem;
  }

  .level-label {
    font-size: 9px;
  }

  footer {
    padding: 1rem 0.75rem;
    font-size: 0.78rem;
  }
}