/* ==================== TOOLTIPS ==================== */
abbr[title] {
    text-decoration: underline dotted;
    text-decoration-color: var(--transcend-blue);
    text-underline-offset: 2px;
    cursor: help;
}

.tooltip-popup {
    position: fixed;
    background: #1a1a1a;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 400;
    line-height: 1.4;
    max-width: 280px;
    z-index: 10000;
    box-shadow: 0 2px 12px rgba(0,0,0,0.3);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.tooltip-popup.visible {
    opacity: 1;
}

/* ==================== LAYOUT ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

.main-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 40px;
    align-items: start;
}

.content-area {
    max-width: 800px;
}

@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    .sidebar-nav {
        display: none;
    }
    .mobile-toc {
        display: block;
    }

    .tool-brief {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .summary-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================== HEADER ==================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border-color);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-section a {
    display: flex;
    align-items: center;
}

.logo {
    height: 32px;
    width: auto;
}

.logo-divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
}

.logo-subtitle {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.15s ease;
}

.logo-subtitle:hover {
    color: var(--transcend-blue);
}

.logo-subtitle.active {
    color: var(--transcend-blue);
    font-weight: 600;
}

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.15s ease;
}

.nav-link:hover {
    color: var(--transcend-blue);
}

.nav-link.active {
    color: var(--transcend-blue);
    font-weight: 600;
}

/* ==================== BACK LINK ==================== */
.back-link {
    display: inline-block;
    color: var(--transcend-blue);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 20px;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--transcend-blue-dark);
    text-decoration: underline;
}

/* ==================== HERO ==================== */
.hero {
    background: linear-gradient(135deg, var(--transcend-blue) 0%, var(--transcend-blue-dark) 100%);
    color: white;
    padding: 48px 40px;
    border-radius: var(--radius-lg);
    margin-bottom: 32px;
}

.hero h1 {
    font-size: 2rem;
    margin: 0 0 16px 0;
    font-weight: 700;
}

.hero .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 24px;
    line-height: 1.6;
}

.hero .key-point {
    background: rgba(255,255,255,0.15);
    border-left: 4px solid white;
    padding: 16px 20px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.95rem;
    line-height: 1.6;
}

.hero .key-point .key-point-title {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
}

.hero .key-point p {
    margin: 0;
}

.tool-brief {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin: -8px 0 28px;
}

.tool-brief > div {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 14px;
    min-width: 0;
}

.brief-label {
    display: block;
    color: var(--transcend-blue);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.7px;
    margin-bottom: 5px;
    text-transform: uppercase;
}

.tool-brief strong {
    display: block;
    font-size: 0.82rem;
    line-height: 1.35;
}

.executive-summary {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 32px;
    padding: 24px;
}

.executive-summary h2 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin: 0 0 12px;
}

.executive-summary p {
    color: var(--text-primary);
    line-height: 1.65;
    margin: 0;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 18px;
}

.summary-grid > div {
    background: var(--bg-primary);
    border-left: 3px solid var(--transcend-blue);
    border-radius: 0 8px 8px 0;
    padding: 14px 16px;
}

.summary-grid h3 {
    color: var(--transcend-blue);
    font-size: 0.82rem;
    margin: 0 0 8px;
    text-transform: uppercase;
}

.summary-grid p {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

/* ==================== SIDEBAR NAVIGATION ==================== */
.sidebar-nav {
    position: sticky;
    top: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
}

.sidebar-nav h3 {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 0 0 16px 0;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    margin-bottom: 4px;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-item a:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.nav-item a.active {
    background: var(--transcend-light);
    color: var(--transcend-blue);
    border-left-color: var(--transcend-blue);
    font-weight: 500;
}

.nav-item .nav-num {
    background: var(--transcend-blue);
    color: white;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.nav-item a.active .nav-num {
    background: var(--transcend-blue-dark);
}

/* Mobile TOC fallback */
.mobile-toc {
    display: none;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 24px;
}

.mobile-toc h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 12px 0;
}

.mobile-toc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 8px;
}

.mobile-toc a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text-primary);
    font-size: 0.85rem;
    transition: all 0.2s;
}

.mobile-toc a:hover {
    background: var(--transcend-light);
    color: var(--transcend-blue);
}

.mobile-toc .num {
    background: var(--transcend-blue);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
}

/* ==================== CONTENT SECTIONS ==================== */
.content-section {
    margin-bottom: 48px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-color);
}

.section-header .num {
    background: var(--transcend-blue);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    flex-shrink: 0;
}

.section-header h2 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--text-primary);
}

.subsection {
    margin-bottom: 32px;
}

.subsection h3 {
    font-size: 1.15rem;
    color: var(--transcend-blue);
    margin: 0 0 16px 0;
    font-weight: 600;
}

.subsection p {
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: 16px;
}

/* ==================== CALLOUT BOXES ==================== */
.callout {
    padding: 20px 24px;
    border-radius: var(--radius-sm);
    margin: 20px 0;
}

.callout-blue {
    background: var(--transcend-light);
    border-left: 4px solid var(--transcend-blue);
}

.callout-green {
    background: var(--green-light);
    border-left: 4px solid var(--metric-green);
}

.callout-amber {
    background: var(--amber-light);
    border-left: 4px solid var(--warning-amber);
}

.callout-red {
    background: var(--red-light);
    border-left: 4px solid var(--danger-red);
}

.callout-title {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
}

.callout-blue .callout-title { color: var(--transcend-blue); }
.callout-green .callout-title { color: #166534; }
.callout-amber .callout-title { color: #92400e; }
.callout-red .callout-title { color: #991b1b; }

.callout p {
    margin: 0;
    line-height: 1.6;
}

/* ==================== TABLES ==================== */
.table-wrapper {
    overflow-x: auto;
    margin: 20px 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.table-wrapper-tight {
    margin-top: 16px;
}

.danger-text {
    color: var(--danger-red);
}

.success-text {
    color: var(--metric-green);
}

.inline-code {
    background: rgba(0,0,0,0.1);
    border-radius: 3px;
    padding: 2px 6px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th {
    background: var(--transcend-blue);
    color: white;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

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

tr:nth-child(even) {
    background: var(--bg-primary);
}

/* ==================== CODE BLOCKS ==================== */
.code-block {
    background: #1e293b;
    color: #e2e8f0;
    padding: 20px;
    border-radius: var(--radius-sm);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.85rem;
    overflow-x: auto;
    margin: 20px 0;
    line-height: 1.5;
}

.code-block .comment {
    color: #94a3b8;
}

/* ==================== FLOW DIAGRAM ==================== */
.flow-diagram {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 24px 0;
}

.flow-step {
    background: white;
    border: 2px solid var(--transcend-blue);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-bottom: 16px;
}

.flow-step h4 {
    color: var(--transcend-blue);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 12px 0;
}

.flow-step ul {
    margin: 0;
    padding-left: 20px;
    color: var(--text-primary);
}

.flow-step li {
    margin-bottom: 6px;
}

.flow-arrow {
    text-align: center;
    color: var(--transcend-blue);
    font-size: 1.5rem;
    margin: 8px 0;
}

/* ==================== CHECKLIST ==================== */
.checklist {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 20px 0;
}

.checklist h4 {
    font-size: 1rem;
    margin: 0 0 16px 0;
    color: var(--text-primary);
}

.checklist-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.checklist-item:last-child {
    border-bottom: none;
}

.checklist-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    accent-color: var(--transcend-blue);
}

.checklist-item label {
    flex: 1;
    cursor: pointer;
}

.checklist-item.checked label {
    color: var(--text-secondary);
    text-decoration: line-through;
}

.priority-badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
}

.priority-p0 {
    background: var(--red-light);
    color: #991b1b;
}

.priority-p1 {
    background: var(--amber-light);
    color: #92400e;
}

.priority-p2 {
    background: #e0e7ff;
    color: #3730a3;
}

/* ==================== MISTAKE CARDS ==================== */
.mistake-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 16px;
}

.mistake-card h4 {
    color: var(--danger-red);
    font-size: 1rem;
    margin: 0 0 12px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mistake-card .mistake {
    background: var(--red-light);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.mistake-card .reality {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.mistake-card .fix {
    background: var(--green-light);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: #166534;
}

/* ==================== CALCULATOR EMBED ==================== */
.calculator-embed {
    background: var(--bg-card);
    border: 2px solid var(--metric-green);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 32px 0;
}

.calculator-intro {
    margin-bottom: 24px;
}

.calculator-embed .calc-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.calculator-embed .calc-header .icon {
    background: var(--metric-green);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.calculator-embed .calc-header h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.calculator-embed .calc-header p {
    margin: 4px 0 0 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Form styling */
.calc-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

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

.form-group-full {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: border-color 0.2s;
    min-width: 0;
    width: 100%;
}

.form-group select {
    min-width: 200px;
}

.form-group input[type="number"] {
    min-width: 120px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--transcend-blue);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
    font-family: monospace;
}

.form-group .hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--transcend-blue);
    color: white;
}

.btn-primary:hover {
    background: var(--transcend-blue-dark);
}

.btn-secondary {
    background: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-row {
    display: flex;
    gap: 12px;
}

/* Results */
.results-panel {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin-top: 20px;
    display: none;
}

.results-panel.visible {
    display: block;
}

.results-panel h4 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 12px 0;
}

.result-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.result-row:last-child {
    border-bottom: none;
}

.result-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.result-value {
    font-weight: 600;
    color: var(--text-primary);
}

.result-value.highlight {
    color: var(--transcend-blue);
    font-size: 1.1rem;
}

.result-value.success { color: var(--metric-green); }
.result-value.warning { color: var(--warning-amber); }
.result-value.danger { color: var(--danger-red); }

.result-formula {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    font-family: monospace;
    font-size: 0.8rem;
    margin-top: 12px;
    overflow-x: auto;
}

.result-recommendation {
    background: var(--transcend-light);
    border-left: 3px solid var(--transcend-blue);
    padding: 12px 16px;
    margin-top: 12px;
    font-size: 0.9rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.result-recommendation-spaced {
    margin-top: 16px;
}

.signin-secondary,
.footer-note,
.comments-empty-help {
    margin-top: 8px;
}

.result-warning {
    background: var(--amber-light);
    border-left: 3px solid var(--warning-amber);
    padding: 12px 16px;
    margin-top: 12px;
    font-size: 0.9rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.error-message {
    background: var(--red-light);
    border: 1px solid var(--danger-red);
    color: #991b1b;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

/* Outcome badges */
.outcome-badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.outcome-badge.positive { background: var(--green-light); color: #166534; }
.outcome-badge.negative { background: var(--red-light); color: #991b1b; }
.outcome-badge.mixed { background: var(--amber-light); color: #92400e; }
.outcome-badge.neutral { background: #f3f4f6; color: var(--text-secondary); }

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.results-column {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px;
}

.results-column h5 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0 0 12px 0;
    text-transform: uppercase;
}

/* ==================== QUICK REFERENCE ==================== */
.quick-ref {
    background: var(--transcend-light);
    border: 1px solid var(--transcend-blue);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 32px 0;
}

.quick-ref h3 {
    color: var(--transcend-blue);
    margin: 0 0 16px 0;
}

/* ==================== RED FLAGS ==================== */
.red-flags {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 24px 0;
}

.red-flags h3 {
    color: var(--danger-red);
    margin: 0 0 16px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.red-flag-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 8px 0;
    font-size: 0.9rem;
}

.red-flag-item .x {
    color: var(--danger-red);
    font-weight: bold;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .logo-section {
        justify-content: center;
    }

    .auth-section {
        width: 100%;
        justify-content: center;
    }

    .hero {
        padding: 32px 24px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .toc-grid {
        grid-template-columns: 1fr;
    }

    .calc-form {
        grid-template-columns: 1fr;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .btn-row {
        flex-direction: column;
    }

    .btn-row .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 16px;
    }

    .tool-brief {
        grid-template-columns: 1fr;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .section-header .num {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }

    .section-header h2 {
        font-size: 1.25rem;
    }
}

/* ==================== FOOTER ==================== */
.footer {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

.footer p {
    margin: 0;
}

.footer p + p {
    margin-top: 8px;
}

/* ==================== LIST STYLES ==================== */
.content-list {
    margin: 16px 0;
    padding-left: 24px;
    line-height: 1.8;
}

.content-list li {
    margin-bottom: 8px;
    color: var(--text-primary);
}

.content-list li strong {
    color: var(--text-primary);
}

@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .content-area {
        max-width: none;
        min-width: 0;
    }

    .sidebar-nav {
        display: none;
    }

    .mobile-toc {
        display: block;
    }

    .tool-brief {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .summary-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .tool-brief {
        grid-template-columns: 1fr;
    }
}