/**
 * Utility Seva — Grade Calculator Stylesheet
 * Strict Compact UI Layout (< 768px desktop screen height compliance)
 * Fully responsive across desktop, tablet, and mobile with Dark Mode support
 */

:root {
  --primary-color: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-light: #f5f3ff;
  --primary-glow: rgba(124, 58, 237, 0.25);
  --success-color: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --warning-color: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);
  --danger-color: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
}

html[data-theme="dark"],
body.dark {
  --primary-color: #a78bfa;
  --primary-hover: #8b5cf6;
  --primary-light: rgba(167, 139, 250, 0.18);
  --primary-glow: rgba(167, 139, 250, 0.35);
  --success-color: #34d399;
  --success-bg: rgba(52, 211, 153, 0.18);
  --warning-color: #fbbf24;
  --warning-bg: rgba(251, 191, 36, 0.18);
  --danger-color: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.18);
}

/* ==========================================================================
   1. Header & Navigation (Utility Seva Standard Header Integration)
   ========================================================================== */
.site-header .nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}

.site-header .theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md, 8px);
  border: 1px solid var(--border-color, #e2e8f0);
  background-color: var(--bg-surface, #ffffff);
  color: var(--text-secondary, #64748b);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  padding: 0;
  transition: all var(--transition-fast, 0.15s ease);
  position: relative;
  overflow: hidden;
}

.site-header .theme-toggle-btn:hover {
  background-color: var(--bg-surface-alt, #f8fafc);
  color: var(--text-primary, #0f172a);
  border-color: var(--border-color-hover, #cbd5e1);
}

.site-header .theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  display: block;
  flex-shrink: 0;
  margin: auto;
  stroke: currentColor;
  stroke-width: 2;
  transition: transform var(--transition-fast, 0.15s ease);
}

.site-header .theme-toggle-btn .sun-icon {
  display: none;
}

.site-header .theme-toggle-btn .moon-icon {
  display: block;
}

html[data-theme="dark"] .site-header .theme-toggle-btn .sun-icon,
body.dark .site-header .theme-toggle-btn .sun-icon {
  display: block;
  color: #fbbf24;
}

html[data-theme="dark"] .site-header .theme-toggle-btn .moon-icon,
body.dark .site-header .theme-toggle-btn .moon-icon {
  display: none;
}

/* ==========================================================================
   2. Main Layout, Breadcrumbs & Top Bar
   ========================================================================== */
.converter-main {
  padding: 1rem 0 2.5rem;
  background-color: var(--bg-page, #f8fafc);
  min-height: calc(100vh - 140px);
}

html[data-theme="dark"] .converter-main,
body.dark .converter-main {
  background-color: #0b1120;
}

.converter-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.85rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.breadcrumb-nav-compact {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--text-muted, #94a3b8);
  margin-bottom: 0.3rem;
}

.breadcrumb-nav-compact a {
  color: var(--text-secondary, #64748b);
  transition: color var(--transition-fast, 0.15s ease);
  text-decoration: none;
}

.breadcrumb-nav-compact a:hover {
  color: var(--primary-color, #7c3aed);
}

.converter-title-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.converter-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary, #0f172a);
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.2;
}

html[data-theme="dark"] .converter-title,
body.dark .converter-title {
  color: #f8fafc;
}

.tool-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.74rem;
  font-weight: 600;
  background-color: var(--primary-light, #f5f3ff);
  color: var(--primary-color, #7c3aed);
  border: 1px solid var(--primary-glow, rgba(124, 58, 237, 0.25));
}

html[data-theme="dark"] .tool-badge-pill,
body.dark .tool-badge-pill {
  background-color: rgba(167, 139, 250, 0.15);
  color: #c4b5fd;
  border-color: rgba(167, 139, 250, 0.3);
}

.converter-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary, #64748b);
  margin: 0.25rem 0 0 0;
  line-height: 1.4;
}

html[data-theme="dark"] .converter-subtitle,
body.dark .converter-subtitle {
  color: #94a3b8;
}

/* ==========================================================================
   3. Controls & Settings Bar
   ========================================================================== */
.calc-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-md, 8px);
  padding: 0.5rem 0.85rem;
  margin-bottom: 1rem;
  gap: 0.75rem;
  flex-wrap: wrap;
}

html[data-theme="dark"] .calc-controls-bar,
body.dark .calc-controls-bar {
  background-color: #1e293b;
  border-color: #334155;
}

.calc-settings-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.setting-item-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary, #475569);
}

html[data-theme="dark"] .setting-item-inline {
  color: #cbd5e1;
}

.calc-select,
.calc-input-sm {
  padding: 0.3rem 0.55rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm, 6px);
  border: 1px solid var(--border-color, #cbd5e1);
  background-color: var(--bg-surface, #ffffff);
  color: var(--text-primary, #0f172a);
  outline: none;
  transition: all var(--transition-fast, 0.15s ease);
}

html[data-theme="dark"] .calc-select,
html[data-theme="dark"] .calc-input-sm {
  background-color: #0f172a;
  border-color: #334155;
  color: #f8fafc;
}

.calc-select:focus,
.calc-input-sm:focus {
  border-color: var(--primary-color, #7c3aed);
  box-shadow: 0 0 0 2px var(--primary-glow, rgba(124, 58, 237, 0.25));
}

.calc-checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  color: var(--text-secondary, #475569);
}

html[data-theme="dark"] .calc-checkbox-label {
  color: #cbd5e1;
}

.calc-checkbox-label input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--primary-color, #7c3aed);
  width: 15px;
  height: 15px;
}

.calc-quick-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.btn-ghost-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.76rem;
  font-weight: 600;
  border-radius: var(--radius-sm, 6px);
  border: 1px solid var(--border-color, #e2e8f0);
  background-color: var(--bg-surface, #ffffff);
  color: var(--text-secondary, #64748b);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast, 0.15s ease);
}

.btn-ghost-sm:hover {
  background-color: var(--bg-surface-alt, #f8fafc);
  color: var(--text-primary, #0f172a);
  border-color: var(--border-color-hover, #cbd5e1);
}

html[data-theme="dark"] .btn-ghost-sm {
  background-color: #1e293b;
  border-color: #334155;
  color: #94a3b8;
}

html[data-theme="dark"] .btn-ghost-sm:hover {
  background-color: #334155;
  color: #f8fafc;
}

/* Alert Notification Banner */
.converter-alert {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-md, 8px);
  background-color: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 0.85rem;
  animation: fadeIn 0.15s ease-in-out;
}

.converter-alert svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

html[data-theme="dark"] .converter-alert {
  background-color: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.35);
  color: #fca5a5;
}

/* ==========================================================================
   4. Main Workspace Grid: Two Columns (1366x768 Compact Layout)
   ========================================================================== */
.grade-workspace-grid {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 1rem;
  align-items: start;
}

@media (max-width: 1080px) {
  .grade-workspace-grid {
    grid-template-columns: 1fr;
  }
}

.grade-panel-card {
  background-color: var(--bg-surface, #ffffff);
  border-radius: var(--radius-lg, 12px);
  border: 1px solid var(--border-color, #e2e8f0);
  box-shadow: var(--shadow-sm, 0 1px 2px 0 rgba(0, 0, 0, 0.05));
  padding: 1rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: border-color var(--transition-fast, 0.15s ease);
}

html[data-theme="dark"] .grade-panel-card {
  background-color: #1e293b;
  border-color: #334155;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.panel-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border-color, #e2e8f0);
}

html[data-theme="dark"] .panel-header-row {
  border-bottom-color: #334155;
}

.panel-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.panel-title svg {
  width: 16px;
  height: 16px;
  color: var(--primary-color, #7c3aed);
}

html[data-theme="dark"] .panel-title {
  color: #f8fafc;
}

.panel-header-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ==========================================================================
   5. Subject Marks Table (Left Panel)
   ========================================================================== */
.table-scroll-container {
  max-height: 440px;
  overflow-y: auto;
  border-radius: var(--radius-md, 8px);
  border: 1px solid var(--border-color, #e2e8f0);
}

html[data-theme="dark"] .table-scroll-container {
  border-color: #334155;
}

.grade-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  text-align: left;
}

.grade-table th {
  background-color: var(--bg-surface-alt, #f8fafc);
  color: var(--text-secondary, #64748b);
  font-weight: 700;
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--border-color, #e2e8f0);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  position: sticky;
  top: 0;
  z-index: 2;
}

html[data-theme="dark"] .grade-table th {
  background-color: #0f172a;
  border-bottom-color: #334155;
  color: #94a3b8;
}

.grade-table td {
  padding: 0.45rem 0.65rem;
  border-bottom: 1px solid var(--border-color, #e2e8f0);
  vertical-align: middle;
}

html[data-theme="dark"] .grade-table td {
  border-bottom-color: #334155;
}

.grade-table tr:last-child td {
  border-bottom: none;
}

.table-input {
  width: 100%;
  padding: 0.35rem 0.55rem;
  font-size: 0.82rem;
  border-radius: var(--radius-sm, 6px);
  border: 1px solid var(--border-color, #cbd5e1);
  background-color: var(--bg-surface, #ffffff);
  color: var(--text-primary, #0f172a);
  outline: none;
  transition: all var(--transition-fast, 0.15s ease);
}

html[data-theme="dark"] .table-input {
  background-color: #0f172a;
  border-color: #334155;
  color: #f8fafc;
}

.table-input:focus {
  border-color: var(--primary-color, #7c3aed);
  box-shadow: 0 0 0 2px var(--primary-glow, rgba(124, 58, 237, 0.25));
}

.table-input.input-error {
  border-color: var(--danger-color, #ef4444) !important;
  background-color: #fff5f5 !important;
}

html[data-theme="dark"] .table-input.input-error {
  background-color: rgba(239, 68, 68, 0.15) !important;
}

.btn-del-row {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  border: none;
  background-color: transparent;
  color: var(--text-muted, #94a3b8);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast, 0.15s ease);
}

.btn-del-row:hover {
  background-color: #fee2e2;
  color: #dc2626;
}

html[data-theme="dark"] .btn-del-row:hover {
  background-color: rgba(239, 68, 68, 0.25);
  color: #f87171;
}

.btn-del-row svg {
  width: 14px;
  height: 14px;
}

.table-footer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.35rem;
}

.btn-add-row {
  padding: 0.4rem 0.85rem;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: var(--radius-sm, 6px);
  border: 1px dashed var(--primary-color, #7c3aed);
  background-color: var(--primary-light, #f5f3ff);
  color: var(--primary-color, #7c3aed);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast, 0.15s ease);
}

.btn-add-row:hover {
  background-color: var(--primary-color, #7c3aed);
  color: #ffffff;
}

html[data-theme="dark"] .btn-add-row {
  background-color: rgba(167, 139, 250, 0.12);
  border-color: #a78bfa;
  color: #c4b5fd;
}

html[data-theme="dark"] .btn-add-row:hover {
  background-color: #a78bfa;
  color: #0f172a;
}

.table-stats-hint {
  font-size: 0.75rem;
  color: var(--text-muted, #94a3b8);
}

/* Custom Grading Scale Collapsible Section */
.custom-scale-editor-card {
  border: 1px dashed var(--border-color, #cbd5e1);
  border-radius: var(--radius-md, 8px);
  background-color: var(--bg-surface-alt, #f8fafc);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

html[data-theme="dark"] .custom-scale-editor-card {
  background-color: #0f172a;
  border-color: #334155;
}

.custom-scale-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
}

html[data-theme="dark"] .custom-scale-header {
  color: #f8fafc;
}

.custom-scale-notice {
  font-size: 0.72rem;
  color: var(--text-muted, #94a3b8);
  line-height: 1.35;
}

.custom-bands-grid {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  max-height: 200px;
  overflow-y: auto;
}

.custom-band-row {
  display: grid;
  grid-template-columns: 80px 1fr 1fr 30px;
  gap: 0.45rem;
  align-items: center;
}

/* ==========================================================================
   6. Results & Analytics (Right Panel)
   ========================================================================== */
.right-result-column {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.status-pill-badge {
  padding: 0.18rem 0.55rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 700;
  background-color: #f1f5f9;
  color: #64748b;
  border: 1px solid #e2e8f0;
}

html[data-theme="dark"] .status-pill-badge {
  background-color: #334155;
  color: #94a3b8;
  border-color: #475569;
}

.status-pill-badge.pass {
  background-color: var(--success-bg, rgba(16, 185, 129, 0.12));
  color: var(--success-color, #10b981);
  border-color: rgba(16, 185, 129, 0.25);
}

.status-pill-badge.fail {
  background-color: var(--danger-bg, rgba(239, 68, 68, 0.12));
  color: var(--danger-color, #ef4444);
  border-color: rgba(239, 68, 68, 0.25);
}

/* Hero Final Grade Banner */
.hero-grade-banner {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.08) 0%, rgba(124, 58, 237, 0.02) 100%);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius-md, 8px);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

html[data-theme="dark"] .hero-grade-banner {
  background: linear-gradient(135deg, rgba(167, 139, 250, 0.12) 0%, rgba(167, 139, 250, 0.03) 100%);
  border-color: rgba(167, 139, 250, 0.3);
}

.hero-grade-score-group {
  display: flex;
  flex-direction: column;
}

.hero-grade-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary, #64748b);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

html[data-theme="dark"] .hero-grade-label {
  color: #94a3b8;
}

.hero-grade-row {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
}

.hero-grade-val {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-color, #7c3aed);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

html[data-theme="dark"] .hero-grade-val {
  color: #a78bfa;
}

.hero-percentage-sub {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
}

html[data-theme="dark"] .hero-percentage-sub {
  color: #f8fafc;
}

.hero-status-pill {
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.hero-status-pill.pass {
  background-color: var(--success-bg, rgba(16, 185, 129, 0.12));
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.hero-status-pill.fail {
  background-color: var(--danger-bg, rgba(239, 68, 68, 0.12));
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

html[data-theme="dark"] .hero-status-pill.pass {
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.35);
}

html[data-theme="dark"] .hero-status-pill.fail {
  color: #f87171;
  border-color: rgba(248, 113, 113, 0.35);
}

/* 4-Stat Metric Tiles Grid */
.grade-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.stat-item-box {
  background-color: var(--bg-surface-alt, #f8fafc);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-sm, 6px);
  padding: 0.55rem 0.75rem;
  display: flex;
  flex-direction: column;
}

html[data-theme="dark"] .stat-item-box {
  background-color: #0f172a;
  border-color: #334155;
}

.stat-item-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted, #94a3b8);
  text-transform: uppercase;
}

.stat-item-val {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
}

html[data-theme="dark"] .stat-item-val {
  color: #f8fafc;
}

/* Grade Distribution Badges */
.distribution-card {
  background-color: var(--bg-surface-alt, #f8fafc);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-sm, 6px);
  padding: 0.65rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

html[data-theme="dark"] .distribution-card {
  background-color: #0f172a;
  border-color: #334155;
}

.distribution-title {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--text-secondary, #64748b);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

html[data-theme="dark"] .distribution-title {
  color: #94a3b8;
}

.distribution-pills-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.dist-pill {
  padding: 0.18rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 700;
  border: 1px solid var(--border-color, #cbd5e1);
  background-color: var(--bg-surface, #ffffff);
  color: var(--text-primary, #0f172a);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

html[data-theme="dark"] .dist-pill {
  background-color: #1e293b;
  border-color: #334155;
  color: #f8fafc;
}

.dist-pill-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.02rem 0.32rem;
  border-radius: 9999px;
  font-size: 0.65rem;
  background-color: rgba(0, 0, 0, 0.08);
}

html[data-theme="dark"] .dist-pill-badge {
  background-color: rgba(255, 255, 255, 0.15);
}

/* Subject-wise Result Mini Table */
.subject-results-card {
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-sm, 6px);
  overflow: hidden;
  max-height: 220px;
  overflow-y: auto;
}

html[data-theme="dark"] .subject-results-card {
  border-color: #334155;
}

.res-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
}

.res-table th {
  background-color: var(--bg-surface-alt, #f8fafc);
  color: var(--text-secondary, #64748b);
  font-weight: 700;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--border-color, #e2e8f0);
  position: sticky;
  top: 0;
  z-index: 1;
}

html[data-theme="dark"] .res-table th {
  background-color: #0f172a;
  border-bottom-color: #334155;
  color: #94a3b8;
}

.res-table td {
  padding: 0.38rem 0.6rem;
  border-bottom: 1px solid var(--border-color, #e2e8f0);
}

html[data-theme="dark"] .res-table td {
  border-bottom-color: #334155;
}

.res-table tr:last-child td {
  border-bottom: none;
}

.grade-badge-sm {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.05rem 0.4rem;
  border-radius: 4px;
  font-weight: 800;
  font-size: 0.72rem;
  background-color: var(--primary-light, #f5f3ff);
  color: var(--primary-color, #7c3aed);
}

html[data-theme="dark"] .grade-badge-sm {
  background-color: rgba(167, 139, 250, 0.2);
  color: #c4b5fd;
}

.status-text-pass {
  color: #059669;
  font-weight: 700;
}

html[data-theme="dark"] .status-text-pass {
  color: #34d399;
}

.status-text-fail {
  color: #dc2626;
  font-weight: 700;
}

html[data-theme="dark"] .status-text-fail {
  color: #f87171;
}

/* Action Buttons Bar */
.action-buttons-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.btn-calc-primary {
  padding: 0.45rem 0.95rem;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-sm, 6px);
  border: 1px solid var(--primary-hover, #6d28d9);
  background-color: var(--primary-color, #7c3aed);
  color: #ffffff;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast, 0.15s ease);
}

.btn-calc-primary:hover {
  background-color: var(--primary-hover, #6d28d9);
  box-shadow: 0 2px 6px rgba(124, 58, 237, 0.35);
}

.btn-calc-secondary {
  padding: 0.45rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-sm, 6px);
  border: 1px solid var(--border-color, #cbd5e1);
  background-color: var(--bg-surface, #ffffff);
  color: var(--text-primary, #0f172a);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast, 0.15s ease);
}

.btn-calc-secondary:hover:not(:disabled) {
  background-color: var(--bg-surface-alt, #f8fafc);
  border-color: var(--border-color-hover, #94a3b8);
}

.btn-calc-secondary:disabled,
.btn-calc-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

html[data-theme="dark"] .btn-calc-secondary {
  background-color: #1e293b;
  border-color: #334155;
  color: #f8fafc;
}

html[data-theme="dark"] .btn-calc-secondary:hover:not(:disabled) {
  background-color: #334155;
}

.btn-calc-ghost {
  padding: 0.45rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-sm, 6px);
  border: 1px solid transparent;
  background-color: transparent;
  color: var(--text-secondary, #64748b);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast, 0.15s ease);
}

.btn-calc-ghost:hover {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--text-primary, #0f172a);
}

html[data-theme="dark"] .btn-calc-ghost {
  color: #94a3b8;
}

html[data-theme="dark"] .btn-calc-ghost:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: #f8fafc;
}

/* Toast Notification */
.copy-feedback-toast {
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md, 8px);
  background-color: #1e293b;
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
  animation: fadeIn 0.2s ease-in-out;
  align-self: center;
}

.copy-feedback-toast svg {
  stroke: #10b981;
}

html[data-theme="dark"] .copy-feedback-toast {
  background-color: #334155;
  color: #f8fafc;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   7. Bottom Educational Guidance Section (3 Columns)
   ========================================================================== */
.educational-guide-section {
  margin-top: 1.5rem;
}

.guide-grid-3col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

@media (max-width: 900px) {
  .guide-grid-3col {
    grid-template-columns: 1fr;
  }
}

.guide-card {
  background-color: var(--bg-surface, #ffffff);
  border-radius: var(--radius-lg, 12px);
  border: 1px solid var(--border-color, #e2e8f0);
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

html[data-theme="dark"] .guide-card {
  background-color: #1e293b;
  border-color: #334155;
}

.guide-card-header {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.guide-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md, 8px);
  background-color: var(--primary-light, #f5f3ff);
  color: var(--primary-color, #7c3aed);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

html[data-theme="dark"] .guide-icon {
  background-color: rgba(167, 139, 250, 0.15);
  color: #c4b5fd;
}

.guide-icon svg {
  width: 17px;
  height: 17px;
}

.guide-card-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
  margin: 0;
}

html[data-theme="dark"] .guide-card-title {
  color: #f8fafc;
}

.guide-card p {
  font-size: 0.78rem;
  color: var(--text-secondary, #64748b);
  line-height: 1.5;
  margin: 0;
}

html[data-theme="dark"] .guide-card p {
  color: #94a3b8;
}

/* ==========================================================================
   8. Print Stylesheet
   ========================================================================== */
@media print {
  .site-header,
  .site-footer,
  .converter-top-bar,
  .calc-controls-bar,
  .educational-guide-section,
  .table-footer-actions,
  .btn-del-row,
  .action-buttons-bar,
  .copy-feedback-toast {
    display: none !important;
  }

  body,
  .converter-main {
    background: #ffffff !important;
    color: #000000 !important;
    padding: 0 !important;
  }

  .grade-workspace-grid {
    display: block !important;
  }

  .grade-panel-card {
    border: 1px solid #000000 !important;
    box-shadow: none !important;
    padding: 0.5rem !important;
    margin-bottom: 1rem !important;
  }

  .table-scroll-container,
  .subject-results-card {
    max-height: none !important;
    overflow: visible !important;
  }
}