/* ==============================================================
   GRADEX - Modern Student Grade Calculator & Presentation UI
   JECRC Foundation • Internship Demonstration
   ============================================================== */

:root {
  --primary: #0f2b5c;
  --primary-light: #1e3a8a;
  --primary-dark: #091a36;
  --accent-orange: #f97316;
  --accent-amber: #f59e0b;
  --accent-cyan: #06b6d4;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --info: #3b82f6;
  --bg-main: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 20px rgba(15, 43, 92, 0.15);
  --radius: 12px;
}

[data-theme="dark"] {
  --bg-main: #0a0f1d;
  --card-bg: #111827;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --border-color: #1f2937;
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.2);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color 0.25s, color 0.25s;
  min-height: 100vh;
}

/* Institutional Top Bar */
.institution-bar {
  background: linear-gradient(135deg, #0b1e3d 0%, #172554 100%);
  color: #ffffff;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 3px solid var(--accent-orange);
  box-shadow: var(--shadow-md);
}

.institution-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-badge {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  color: white;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 2px 6px rgba(220, 38, 38, 0.4);
}

.brand-title h1 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-title p {
  font-size: 0.8rem;
  color: #cbd5e1;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-ctrl {
  background: rgba(255, 255, 255, 0.12);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.btn-ctrl:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

/* Tabs Bar */
.tabs-nav {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: center;
  padding: 0 20px;
  gap: 8px;
  position: sticky;
  top: 0;
  z-index: 40;
}

.tab-btn {
  background: none;
  border: none;
  padding: 14px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 3px solid transparent;
  transition: all 0.2s;
}

.tab-btn:hover {
  color: var(--primary);
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--accent-orange);
  font-weight: 700;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

/* Pipeline Stage Banner */
.pipeline-banner {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 20px 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.pipeline-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.badge-tag {
  background: #fff7ed;
  color: #c2410c;
  border: 1px solid #ffedd5;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.pipeline-stepper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  position: relative;
}

.pipeline-step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-main);
  border-radius: 10px;
  border: 2px solid transparent;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.pipeline-step.active {
  background: rgba(15, 43, 92, 0.05);
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.pipeline-step.completed {
  border-color: var(--success);
}

.step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
  transition: all 0.2s;
}

.pipeline-step.active .step-num {
  background: var(--primary);
  color: white;
}

.pipeline-step.completed .step-num {
  background: var(--success);
  color: white;
}

.step-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.step-info p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Quick Demo Presets */
.preset-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  padding: 12px 16px;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.preset-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.preset-btn {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.preset-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Main Grid Layout */
.app-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
}

/* Card Common */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

/* Form Styles */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.input-field {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-main);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.input-field:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 43, 92, 0.1);
}

/* Subject Marks Table */
.subjects-wrapper {
  margin-top: 16px;
}

.subject-item {
  display: grid;
  grid-template-columns: 1.3fr 1.2fr 80px 36px;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  background: var(--bg-main);
  border-radius: 8px;
  margin-bottom: 10px;
  border: 1px solid var(--border-color);
  transition: border-color 0.2s;
}

.subject-item.fail {
  border-color: #fca5a5;
  background: rgba(239, 68, 68, 0.05);
}

.subject-item.distinction {
  border-color: #86efac;
}

.subject-name-col {
  display: flex;
  flex-direction: column;
}

.sub-title {
  font-weight: 600;
  font-size: 0.9rem;
}

.sub-status {
  font-size: 0.72rem;
  font-weight: 600;
}

.sub-status.pass { color: var(--success); }
.sub-status.fail { color: var(--danger); }

.subject-slider-col {
  display: flex;
  align-items: center;
}

.slider-input {
  width: 100%;
  accent-color: var(--primary);
  cursor: pointer;
}

.subject-item.fail .slider-input {
  accent-color: var(--danger);
}

.subject-val-col input {
  width: 100%;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-primary);
  font-weight: 700;
  text-align: center;
}

.btn-del-sub {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  transition: all 0.2s;
}

.btn-del-sub:hover {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
}

.add-sub-bar {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

/* Live Analytics Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 16px 12px;
  border-radius: 10px;
  text-align: center;
}

.stat-val {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Grade Decision Matrix */
.grade-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-top: 8px;
}

.grade-table th, .grade-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.grade-table th {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
}

.grade-row.active {
  background: rgba(16, 185, 129, 0.12);
  font-weight: 700;
  border-left: 4px solid var(--success);
}

.grade-row.active.fail {
  background: rgba(239, 68, 68, 0.12);
  border-left-color: var(--danger);
}

.grade-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 800;
  font-size: 0.8rem;
}

.grade-badge.a-plus { background: #dcfce7; color: #15803d; }
.grade-badge.a { background: #dcfce7; color: #166534; }
.grade-badge.b { background: #e0f2fe; color: #0369a1; }
.grade-badge.c { background: #e0e7ff; color: #4338ca; }
.grade-badge.d { background: #fef3c7; color: #b45309; }
.grade-badge.e { background: #fef3c7; color: #92400e; }
.grade-badge.f { background: #fee2e2; color: #b91c1c; }

/* Rule callout */
.rule-callout {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-top: 14px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.rule-callout.success {
  background: var(--success-bg);
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.rule-callout.fail {
  background: var(--danger-bg);
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* Institutional Report Card */
.report-card-preview {
  background: #ffffff;
  color: #0f172a;
  border: 2px solid #0f2b5c;
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow-md);
  position: relative;
}

.report-header {
  text-align: center;
  border-bottom: 2px solid #0f2b5c;
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.report-institution {
  font-size: 1.15rem;
  font-weight: 900;
  color: #0f2b5c;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.report-sub {
  font-size: 0.8rem;
  font-weight: 600;
  color: #475569;
}

.report-badge-intern {
  display: inline-block;
  background: #0f2b5c;
  color: white;
  font-size: 0.7rem;
  padding: 2px 10px;
  border-radius: 4px;
  font-weight: 700;
  margin-top: 4px;
}

.report-meta-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 16px;
  font-size: 0.85rem;
  margin-bottom: 16px;
  padding: 10px 14px;
  background: #f8fafc;
  border-radius: 6px;
  border: 1px solid #e2e8f0;
}

.meta-item span:first-child {
  font-weight: 600;
  color: #64748b;
  margin-right: 6px;
}

.meta-item span:last-child {
  font-weight: 700;
  color: #0f172a;
}

.report-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
  font-size: 0.85rem;
}

.report-table th, .report-table td {
  padding: 8px 12px;
  border: 1px solid #cbd5e1;
  text-align: center;
}

.report-table th {
  background: #0f2b5c;
  color: white;
  font-weight: 700;
}

.report-table td:nth-child(2) {
  text-align: left;
  font-weight: 600;
}

.report-summary-box {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 2px solid #0f2b5c;
  border-radius: 6px;
  overflow: hidden;
  text-align: center;
  margin-bottom: 20px;
}

.sum-cell {
  padding: 10px;
  background: #f8fafc;
  border-right: 1px solid #cbd5e1;
}

.sum-cell:last-child {
  border-right: none;
}

.sum-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0f2b5c;
}

.sum-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  font-weight: 700;
  color: #64748b;
}

.report-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px dashed #cbd5e1;
  font-size: 0.75rem;
  color: #64748b;
}

.sign-line {
  width: 160px;
  border-top: 1px solid #0f172a;
  text-align: center;
  padding-top: 4px;
  font-weight: 700;
  color: #0f172a;
}

/* Action Buttons */
.action-bar {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
  box-shadow: 0 2px 4px rgba(15, 43, 92, 0.2);
}

.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: var(--bg-main);
}

/* Presentation Slide Tab View */
.slide-replica {
  background: #ffffff;
  color: #0f172a;
  border: 3px solid #0f2b5c;
  border-radius: 12px;
  padding: 36px 40px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-lg);
  background-image: radial-gradient(#cbd5e1 1.2px, transparent 1.2px);
  background-size: 24px 24px;
}

.slide-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid #0f2b5c;
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.slide-title-area h2 {
  font-size: 2rem;
  font-weight: 900;
  color: #0f2b5c;
}

.slide-flowchart {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 32px 0;
  flex-wrap: wrap;
}

.flow-box {
  background: #0f2b5c;
  color: white;
  padding: 16px 24px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: var(--shadow-md);
}

.flow-box.light {
  background: #cbd5e1;
  color: #0f2b5c;
}

.flow-arrow {
  color: #0f2b5c;
  font-size: 1.6rem;
  font-weight: 900;
}

.slide-steps-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 24px 0;
}

.slide-step-item {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 1.1rem;
  font-weight: 600;
}

.step-circle {
  width: 32px;
  height: 32px;
  background: #ea580c;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

/* Leaderboard Table */
.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.leaderboard-table th, .leaderboard-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.leaderboard-table th {
  background: var(--bg-main);
  font-weight: 700;
  color: var(--text-muted);
}

/* Code Viewer */
.code-container {
  background: #0b1120;
  color: #e2e8f0;
  border-radius: 10px;
  padding: 20px;
  font-family: "Cascadia Code", "Fira Code", Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  overflow-x: auto;
  border: 1px solid #1e293b;
}

/* Print Stylesheet */
@media print {
  body {
    background: white !important;
    color: black !important;
  }

  .institution-bar,
  .tabs-nav,
  .pipeline-banner,
  .preset-bar,
  .app-grid > div:first-child,
  .action-bar,
  .tab-content:not(#tab-calculator),
  .card:not(#card-report) {
    display: none !important;
  }

  .app-grid {
    display: block !important;
  }

  .container {
    max-width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .report-card-preview {
    border: 2px solid black !important;
    box-shadow: none !important;
    padding: 20px !important;
    page-break-inside: avoid;
  }
}

/* Mobile Responsiveness */
@media (max-width: 880px) {
  .app-grid {
    grid-template-columns: 1fr;
  }
  .pipeline-stepper {
    grid-template-columns: 1fr 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .report-summary-box {
    grid-template-columns: 1fr 1fr;
  }
}