/* ===== CSS Variables & Base Styles ===== */
:root{ 
  --bg:#0f172a; 
  --card:#1e293b; 
  --muted:#94a3b8; 
  --text:#f1f5f9; 
  --accent:#22d3ee; 
  --warn:#f59e0b; 
  --good:#10b981; 
  --bad:#ef4444; 
  --border:#334155; 
  --chip:#1e293b; 
}

[data-theme="light"]{ 
  --bg:#f7fafc; 
  --card:#ffffff; 
  --muted:#4a5568; 
  --text:#0f172a; 
  --accent:#0ea5e9; 
  --warn:#d97706; 
  --good:#16a34a; 
  --bad:#dc2626; 
  --border:#e2e8f0; 
  --chip:#f1f5f9; 
}

*{box-sizing:border-box}
html,body{
  margin:0;
  padding:0;
  background:var(--bg);
  color:var(--text);
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;
  height:100%;
  overflow:hidden;
}

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

/* ===== Login Screen ===== */
.login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #0f1419 0%, #1a1f2e 100%);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.login-box {
  background: rgba(26, 31, 46, 0.95);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.login-logo {
  text-align: center;
  margin-bottom: 30px;
}

.login-logo h2 {
  font-size: 32px;
  background: linear-gradient(135deg, #22d3ee 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0;
}

.login-subtitle {
  text-align: center;
  color: var(--muted);
  margin-bottom: 30px;
  font-size: 14px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--muted);
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background: rgba(15, 20, 25, 0.6);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: 8px;
  color: #ffffff;
  font-size: 15px;
  transition: all 0.3s ease;
}

.form-input:focus {
  outline: none;
  border-color: #22d3ee;
  background: rgba(15, 20, 25, 0.8);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

.login-button {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, #22d3ee 0%, #06b6d4 100%);
  border: none;
  border-radius: 8px;
  color: #001018;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 10px;
}

.login-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(34, 211, 238, 0.3);
}

.error-message {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
  padding: 10px;
  border-radius: 6px;
  margin-top: 15px;
  font-size: 13px;
  display: none;
  text-align: center;
}

.main-app {
  display: none;
  height: 100vh;
  overflow: hidden;
}

.main-app.active {
  display: flex;
  flex-direction: column;
}

/* ===== Header Bar ===== */
.header-bar {
  min-height: 60px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  flex-shrink: 0;
  z-index: 100;
}

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

.header-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: 0;
}

.file-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  text-align: center;
  line-height: 1.3;
}

.file-info {
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  line-height: 1.3;
}

.suitability-rating {
  margin-top: 2px;
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
  display: inline-block;
  line-height: 1.4;
  white-space: nowrap;
}

.suitability-rating.green {
  background: rgba(16, 185, 129, 0.2);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.suitability-rating.yellow {
  background: rgba(245, 158, 11, 0.2);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.suitability-rating.red {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

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

.btn-primary {
  background: linear-gradient(90deg, #06b6d4, #22d3ee);
  color: #001018;
  border: none;
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background: linear-gradient(90deg, #0891b2, #06b6d4);
  transform: translateY(-1px);
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-icon:hover {
  background: var(--chip);
}

.logout-btn {
  background: transparent;
  border: 1px solid rgba(239, 68, 68, 0.5);
  color: #f87171;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.logout-btn:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: #f87171;
}

/* ===== Main Container ===== */
.main-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
  width: 250px;
  background: var(--card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo {
  font-size: 24px;
  margin: 0;
  background: linear-gradient(135deg, #22d3ee 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-version {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.sidebar-nav {
  flex: 1;
  padding: 12px 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  color: var(--text);
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background: var(--chip);
  color: var(--accent);
}

.nav-item.active {
  background: var(--chip);
  color: var(--accent);
  border-left-color: var(--accent);
}

.nav-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.nav-text {
  font-size: 14px;
  font-weight: 500;
}

/* ===== Content Area ===== */
.content-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg);
  padding: 24px;
}

.content-section {
  display: none;
}

.content-section.active {
  display: block;
}

.section-header {
  margin-bottom: 24px;
}

.section-header h2 {
  font-size: 24px;
  margin: 0;
  color: var(--text);
}

.section-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===== Common Components ===== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
}

.grid {
  display: grid;
  gap: 12px;
}

.grid.stats {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.stat {
  padding: 14px;
  border-radius: 14px;
  background: var(--chip);
  border: 1px solid var(--border);
}

.stat .k {
  font-size: 11px;
  color: var(--muted);
}

.stat .v {
  font-size: 18px;
  margin-top: 6px;
  font-weight: 600;
}

table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  background: var(--chip);
  border-radius: 12px;
  overflow: hidden;
}

th, td {
  padding: 10px;
  border-bottom: 1px solid var(--border);
  text-align: right;
  transition: background-color 0.2s ease;
}

th:first-child, td:first-child {
  text-align: left;
}

tr:hover td {
  background: color-mix(in srgb, var(--accent) 12%, var(--chip));
}

/* Better hover contrast for both themes */
[data-theme="dark"] tr:hover td {
  background: rgba(34, 211, 238, 0.15);
}

[data-theme="light"] tr:hover td {
  background: rgba(14, 165, 233, 0.12);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  border: 1px solid var(--border);
  background: var(--chip);
}

.badge.good {
  color: var(--good);
  border-color: rgba(16, 185, 129, 0.3);
}

.badge.bad {
  color: var(--bad);
  border-color: rgba(239, 68, 68, 0.3);
}

.pill {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--chip);
  margin-right: 8px;
}

.green { color: var(--good); }
.red { color: var(--bad); }
.muted { color: var(--muted); }

button {
  background: var(--chip);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 14px;
}

button:hover {
  background: var(--border);
}

input[type="text"], 
input[type="number"], 
input[type="file"], 
select {
  background: var(--chip);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  font-size: 14px;
}

input[type="checkbox"] {
  transform: scale(1.2);
}

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

canvas {
  background: var(--chip);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
}

/* Chart.js tooltip improvements */
.chartjs-tooltip {
  opacity: 1 !important;
  background: var(--card) !important;
  border: 1px solid var(--border) !important;
  color: var(--text) !important;
}

/* Details/summary improvements */
details summary {
  cursor: pointer;
  user-select: none;
  padding: 8px;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

details summary:hover {
  background: var(--chip);
}

details[open] summary {
  margin-bottom: 8px;
}

.log {
  background: var(--chip);
  border: 1px solid var(--border);
  padding: 10px;
  border-radius: 12px;
  max-height: 240px;
  overflow: auto;
  white-space: pre-wrap;
  font-family: monospace;
  font-size: 12px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -250px;
    top: 60px;
    height: calc(100vh - 60px);
    z-index: 200;
    transition: left 0.3s ease;
  }

  .sidebar.open {
    left: 0;
  }

  .content-area {
    padding: 16px;
  }

  .grid.stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== Heatmap Styles ===== */
.heat-wrap {
  overflow-x: auto;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
}

.heat-table {
  table-layout: fixed;
  border-collapse: collapse;
  min-width: 90%;
  width: 100%;
  border: 1px solid var(--border);
  background: var(--chip);
  border-radius: 12px;
  overflow: hidden;
}

.heat-table th,
.heat-table td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  text-align: right;
  white-space: nowrap;
  font-size: 12px;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.heat-table th:first-child,
.heat-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--card);
  text-align: left;
}

.heat-table tr:hover td:first-child {
  background: color-mix(in srgb, var(--accent) 12%, var(--card));
}

[data-theme="dark"] .heat-table tr:hover td:first-child {
  background: rgba(34, 211, 238, 0.15);
}

[data-theme="light"] .heat-table tr:hover td:first-child {
  background: rgba(14, 165, 233, 0.12);
}

/* ===== Additional Utilities ===== */
.row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.flex {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.grow {
  flex: 1;
}

.hint {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.filelist {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filepill {
  background: var(--chip);
  border: 1px solid var(--border);
  padding: 8px 10px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filepill:hover {
  background: var(--border);
  color: var(--accent);
}

.filepill.active {
  background: var(--accent);
  color: #001018;
  border-color: var(--accent);
}