/* ── Reset & base ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0d1117;
  --bg2:         #161b22;
  --bg3:         #21262d;
  --border:      #30363d;
  --text:        #e6edf3;
  --text-muted:  #8b949e;
  --accent:      #58a6ff;
  --accent2:     #3fb950;
  --critical:    #f85149;
  --high:        #ff7b72;
  --medium:      #e3b341;
  --low:         #3fb950;
  --radius:      8px;
  --font:        'Inter', system-ui, -apple-system, sans-serif;
  --shadow:      none;
}

[data-theme="light"] {
  --bg:          #f6f8fa;
  --bg2:         #ffffff;
  --bg3:         #f0f2f5;
  --border:      #d0d7de;
  --text:        #1f2328;
  --text-muted:  #656d76;
  --accent:      #0969da;
  --accent2:     #1a7f37;
  --critical:    #cf222e;
  --high:        #bc4c00;
  --medium:      #9a6700;
  --low:         #1a7f37;
  --shadow:      0 1px 3px rgba(0,0,0,0.08);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Header ───────────────────────────────────────────────────────────── */
header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon { font-size: 24px; }

.brand h1 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.brand-sub {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.header-links {
  display: flex;
  gap: 20px;
}

.header-links a {
  font-size: 13px;
  color: var(--text-muted);
}

.header-links a:hover { color: var(--text); text-decoration: none; }

.theme-toggle {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 15px;
  padding: 3px 10px;
  line-height: 1.6;
  transition: border-color 0.15s, color 0.15s;
  display: flex;
  align-items: center;
  gap: 5px;
}

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

/* ── Main layout ──────────────────────────────────────────────────────── */
main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  width: 100%;
}

/* ── Cards ────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  cursor: pointer;
  margin-bottom: 0;
  user-select: none;
}

.card-header + #group-panel {
  margin-top: 16px;
}

.collapse-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: var(--radius);
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, transform 0.2s;
  flex-shrink: 0;
  margin-top: 2px;
}

.collapse-btn:hover { color: var(--accent); border-color: var(--accent); }
.collapse-btn.collapsed { transform: rotate(180deg); }

#group-panel {
  overflow: hidden;
  transition: max-height 0.25s ease, opacity 0.2s ease;
  max-height: 2000px;
  opacity: 1;
}

#group-panel.collapsed {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
}

.selected-badge {
  display: inline-block;
  background: rgba(88,166,255,0.15);
  border: 1px solid rgba(88,166,255,0.4);
  color: var(--accent);
  border-radius: 12px;
  padding: 1px 10px;
  font-size: 12px;
  font-weight: 500;
  margin-left: 10px;
  vertical-align: middle;
}

.step-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 6px;
}

.card h2 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.hint {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 16px;
}

.optional {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
}

/* ── Group search & grid ──────────────────────────────────────────────── */
.search-row { margin-bottom: 16px; }

input[type="text"] {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 8px 12px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}

input[type="text"]:focus { border-color: var(--accent); }

.group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.group-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
}

.group-card:hover { border-color: var(--accent); background: var(--bg3); }

.group-card.selected {
  border-color: var(--accent);
  background: var(--bg3);
  box-shadow: 0 0 0 1px var(--accent);
}

.group-name {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 3px;
}

.group-id {
  font-size: 11px;
  color: var(--accent);
  font-family: monospace;
  margin-bottom: 4px;
}

.group-aliases {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.group-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.group-tech-count {
  display: inline-block;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1px 8px;
  font-size: 11px;
}

.loading-spinner { color: var(--text-muted); padding: 20px 0; }

/* ── Upload area ──────────────────────────────────────────────────────── */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: border-color 0.15s;
  margin-bottom: 12px;
  cursor: pointer;
}

.upload-area:hover, .upload-area.drag-over {
  border-color: var(--accent);
}

.upload-area input[type="file"] {
  display: none;
}

.upload-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--text-muted);
}

.upload-icon { font-size: 28px; }

.upload-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.yaml-status {
  font-size: 13px;
  color: var(--accent2);
}

.yaml-status.error { color: var(--critical); }

/* ── Buttons ──────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
  white-space: nowrap;
}

.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) { background: #79b8ff; }

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

.btn-ghost:hover { background: var(--bg3); border-color: var(--accent); }

.btn-large { padding: 12px 28px; font-size: 15px; }

.btn-icon { font-size: 16px; }

.step-action {
  display: flex;
  align-items: center;
  gap: 20px;
}

.analyze-hint {
  color: var(--text-muted);
  font-size: 13px;
}

/* ── Results header ───────────────────────────────────────────────────── */
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
  gap: 16px;
}

.results-title h2 { font-size: 20px; }
.results-desc { color: var(--text-muted); font-size: 13px; margin-top: 4px; max-width: 600px; }

.results-actions { display: flex; gap: 10px; flex-shrink: 0; }

/* ── Summary cards ────────────────────────────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.summary-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  border-top-width: 3px;
}

.summary-card.critical { border-top-color: var(--critical); }
.summary-card.high     { border-top-color: var(--high); }
.summary-card.covered  { border-top-color: var(--accent); }
.summary-card.total    { border-top-color: var(--text-muted); }

.summary-num {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 4px;
}

.summary-label { font-size: 12px; color: var(--text-muted); }

/* ── Filter bar ───────────────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.filter-label { font-size: 12px; color: var(--text-muted); }

.filter-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 20px;
  padding: 3px 12px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.filter-btn.active, .filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg2);
}

.filter-bar input[type="text"] {
  width: auto;
  flex: 1;
  min-width: 180px;
  padding: 4px 12px;
  font-size: 13px;
}

/* ── Table ────────────────────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

thead {
  background: var(--bg3);
  position: sticky;
  top: 60px;
  z-index: 10;
}

th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

th:hover { color: var(--text); }

td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tbody tr:last-child td { border-bottom: none; }

tbody tr:hover { background: var(--bg3); }

.tech-id {
  font-family: monospace;
  font-size: 12px;
  color: var(--accent);
}

.tech-name { font-weight: 500; }

.tactic-pill {
  display: inline-block;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1px 7px;
  font-size: 10px;
  color: var(--text-muted);
  margin: 1px 2px;
  white-space: nowrap;
}

.score-bar {
  display: flex;
  align-items: center;
  gap: 8px;
}

.score-pip-row {
  display: flex;
  gap: 2px;
}

.score-pip {
  width: 8px;
  height: 14px;
  border-radius: 2px;
  background: var(--bg3);
  border: 1px solid var(--border);
}

.score-pip.filled { background: var(--accent); border-color: var(--accent); }
.score-pip.filled.zero { background: var(--critical); border-color: var(--critical); }

.score-num {
  font-size: 12px;
  color: var(--text-muted);
  min-width: 18px;
}

/* Priority badges */
.priority-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border-radius: 12px;
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.priority-badge.critical { background: rgba(248,81,73,0.15); color: var(--critical); border: 1px solid rgba(248,81,73,0.3); }
.priority-badge.high     { background: rgba(255,123,114,0.15); color: var(--high);     border: 1px solid rgba(255,123,114,0.3); }
.priority-badge.medium   { background: rgba(227,179,65,0.15); color: var(--medium);   border: 1px solid rgba(227,179,65,0.3); }
.priority-badge.low      { background: rgba(63,185,80,0.15);  color: var(--low);      border: 1px solid rgba(63,185,80,0.3); }

.d3fend-count {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
}

.d3fend-count.has-controls { color: var(--accent2); }
.d3fend-count.no-controls  { color: var(--text-muted); }

/* ── Empty techniques section ─────────────────────────────────────────── */
.empty-section-row td { padding: 0; border-top: 1px dashed var(--border); }

.empty-details {
  padding: 10px 14px;
}

.empty-details summary {
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.empty-details summary::before { content: "▶"; font-size: 10px; transition: transform 0.15s; }
.empty-details[open] summary::before { transform: rotate(90deg); }

.empty-list {
  padding: 10px 0 4px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.empty-tid {
  font-family: monospace;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  text-decoration: none;
}

.empty-tid:hover { color: var(--accent); border-color: var(--accent); }

/* ── Expand row ───────────────────────────────────────────────────────── */
.expand-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  padding: 4px 6px;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
  line-height: 1;
}

.expand-btn:hover { color: var(--accent); background: var(--bg3); }

.detail-row td {
  background: var(--bg3);
  padding: 0;
}

.detail-inner {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
}

.detail-inner h4 {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.d3fend-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 8px;
}

.d3fend-item {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
}

.d3fend-item a {
  font-weight: 500;
  font-size: 13px;
}

.d3fend-tactic {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
}

.no-d3fend {
  color: var(--text-muted);
  font-size: 13px;
  font-style: italic;
}

.detail-links {
  margin-top: 14px;
  display: flex;
  gap: 10px;
}

/* ── Loading overlay ──────────────────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.loading-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px 48px;
  text-align: center;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-sub { color: var(--text-muted); font-size: 12px; margin-top: 6px; }

/* ── Utilities ────────────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Footer ───────────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
}

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
  .results-header { flex-direction: column; }
  .step-action { flex-direction: column; align-items: flex-start; }
  .header-links { display: none; }
}