/* ============================================
    CSS Variables & Theme
    ============================================ */
:root {
    --bg-primary: #0a0e14;
    --bg-secondary: #12171f;
    --bg-card: #181f2a;
    --bg-input: #1e2734;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #5a6370;
    --border-color: #2d3748;
    --accent-primary: #06b6d4;
    --accent-primary-dim: rgba(6, 182, 212, 0.15);
    --accent-success: #22c55e;
    --accent-success-dim: rgba(34, 197, 94, 0.15);
    --accent-warning: #eab308;
    --accent-warning-dim: rgba(234, 179, 8, 0.15);
    --accent-error: #ef4444;
    --accent-error-dim: rgba(239, 68, 68, 0.15);
    --accent-info: #8b5cf6;
    --accent-info-dim: rgba(139, 92, 246, 0.15);
    --accent-secondary: #6366f1;
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);

    /* Chart-specific colors */
    --chart-saturation: #f59e0b;
    --chart-rh-line: rgba(6, 182, 212, 0.5);
    --chart-enthalpy: rgba(34, 197, 94, 0.6);
    --chart-volume: rgba(139, 92, 246, 0.5);
    --chart-point: #ef4444;
    --chart-grid: rgba(91, 99, 115, 0.3);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-input: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #cbd5e1;
    --accent-primary-dim: rgba(6, 182, 212, 0.1);
    --accent-success-dim: rgba(34, 197, 94, 0.1);
    --accent-warning-dim: rgba(234, 179, 8, 0.1);
    --accent-error-dim: rgba(239, 68, 68, 0.1);
    --accent-info-dim: rgba(139, 92, 246, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
}

*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 24px;
}

/* ============================================
    Header
    ============================================ */
header {
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.15s ease;
}

.back-link svg {
    width: 18px;
    height: 18px;
}

.back-link:hover {
    color: var(--text-primary);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.tool-icon-header {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--accent-primary-dim);
    border: 1px solid rgba(6, 182, 212, 0.35);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-icon-header svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.tagline {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 4px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.status-badges {
    display: flex;
    gap: 8px;
}

.status-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.status-badge.ok {
    background: var(--accent-success-dim);
    border-color: var(--accent-success);
    color: var(--accent-success);
}

.status-badge.warn {
    background: var(--accent-warning-dim);
    border-color: var(--accent-warning);
    color: var(--accent-warning);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    gap: 6px;
    padding: 4px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    border-radius: 10px;
}

.theme-toggle button {
    width: 36px;
    height: 36px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.theme-toggle button svg {
    width: 18px;
    height: 18px;
}

.theme-toggle button:hover {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

html[data-theme="light"] .theme-toggle button[data-theme-toggle="light"],
html:not([data-theme="light"]) .theme-toggle button[data-theme-toggle="dark"] {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

/* ============================================
    Main Layout
    ============================================ */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 24px;
}

@media (max-width: 1200px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.panel-title {
    font-size: 0.9375rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.panel-title svg {
    width: 18px;
    height: 18px;
    stroke: var(--accent-primary);
}

.panel-body {
    padding: 20px;
}

/* ============================================
    Chart Area
    ============================================ */
.chart-area {
    padding: 20px;
    display: flex;
    flex-direction: column;
}

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

.chart-legend {
    display: flex;
    gap: 16px;
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
}

.legend-line {
    width: 20px;
    height: 3px;
    border-radius: 2px;
}

.legend-line.saturation { background: var(--chart-saturation); height: 4px; }
.legend-line.rh { background: var(--chart-rh-line); }
.legend-line.enthalpy { background: var(--chart-enthalpy); border-style: dashed; }
.legend-line.volume { background: var(--chart-volume); border-style: dotted; }
.legend-line.point { background: var(--chart-point); height: 8px; border-radius: 50%; width: 8px; }

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

.tool-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.tool-btn:hover:not(:disabled) {
    border-color: var(--accent-primary);
    background: var(--bg-card);
}

.tool-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.chart-container {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    min-height: 500px;
    position: relative;
}

#psychoCanvas {
    cursor: crosshair;
    width: 100%;
    height: 100%;
}

/* ============================================
    Controls Panel
    ============================================ */
.section {
    margin-bottom: 20px;
}

.section:last-child {
    margin-bottom: 0;
}

.section-header {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

/* Input Mode Toggle */
.mode-toggle {
    display: flex;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    flex-wrap: wrap;
}

.mode-toggle button {
    flex: 1;
    min-width: 80px;
    padding: 10px 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.mode-toggle button:hover {
    color: var(--text-primary);
    background: var(--bg-input);
}

.mode-toggle button.active {
    background: var(--accent-primary);
    color: #000;
    font-weight: 600;
}

/* Input Grid */
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

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

.field label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.field input,
.field select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 12px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s;
}

.field input:focus,
.field select:focus {
    border-color: var(--accent-primary);
}

.field input::placeholder {
    color: var(--text-muted);
}

.unit-toggle {
    display: flex;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.unit-toggle button {
    flex: 1;
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.15s;
}

.unit-toggle button:hover {
    color: var(--text-primary);
}

.unit-toggle button.active {
    background: var(--accent-primary);
    color: #000;
    font-weight: 600;
}

/* Values Card */
.values-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.values-header {
    padding: 12px 16px;
    background: var(--bg-input);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-success);
}

.status-dot.warn {
    background: var(--accent-warning);
}

.values-body {
    padding: 12px 16px;
}

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

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

.value-name {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.value-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.value-number.muted {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.75rem;
}

.value-sub {
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* ============================================
    Chart Overlays Toggle
    ============================================ */
.toggle-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.toggle-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
}

.toggle-item:hover {
    border-color: var(--accent-primary);
}

.toggle-item input[type="checkbox"] {
    display: none;
}

.toggle-box {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    flex-shrink: 0;
}

.toggle-item input:checked + .toggle-box {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toggle-box svg {
    width: 10px;
    height: 10px;
    stroke: #000;
    stroke-width: 3;
    opacity: 0;
}

.toggle-item input:checked + .toggle-box svg {
    opacity: 1;
}

.toggle-label {
    font-size: 0.7rem;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
}

/* ============================================
    Foldable Calculation Details
    ============================================ */
.foldable-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.foldable-header:hover {
    border-color: var(--accent-primary);
    background: var(--bg-input);
}

.foldable-header.active {
    border-radius: 8px 8px 0 0;
    border-bottom-color: transparent;
}

.foldable-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.foldable-title svg {
    width: 16px;
    height: 16px;
    stroke: var(--accent-primary);
}

.foldable-chevron {
    width: 16px;
    height: 16px;
    stroke: var(--text-muted);
    transition: transform 0.2s;
}

.foldable-header.active .foldable-chevron {
    transform: rotate(180deg);
}

.foldable-content {
    display: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 8px 8px;
    padding: 16px;
    max-height: 400px;
    overflow-y: auto;
}

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

.calc-section {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.calc-section:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.calc-header {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}

.calc-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
    font-size: 0.75rem;
}

.calc-label {
    color: var(--text-secondary);
}

.calc-value {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    font-weight: 500;
}

.calc-value.calc-small {
    font-size: 0.6875rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* Calculation Error Message */
.calculation-error {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    margin-bottom: 16px;
    background: var(--accent-error-dim);
    border: 1px solid var(--accent-error);
    border-radius: 8px;
    color: var(--accent-error);
    font-size: 0.875rem;
}

.calculation-error svg {
    flex-shrink: 0;
}

.calculation-error span {
    flex: 1;
}

.calc-value.calc-result {
    color: var(--accent-primary);
    font-size: 0.875rem;
    font-weight: 600;
}

.calc-value.calc-success {
    color: var(--accent-success);
}

.calc-equation {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-primary);
    border-radius: 6px;
    padding: 12px 14px;
}

.eq-name {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.eq-formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    color: var(--text-primary);
}

.calc-iterations {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    background: var(--bg-input);
    border-radius: 6px;
    padding: 10px 12px;
    max-height: 120px;
    overflow-y: auto;
}

.calc-iter-row {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.calc-iter-row:last-child {
    border-bottom: none;
    color: var(--accent-success);
    font-weight: 500;
}

.calc-warning {
    background: var(--accent-warning-dim);
    border: 1px solid rgba(234, 179, 8, 0.3);
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 0.75rem;
    color: var(--accent-warning);
}

/* Nested Foldable */
.nested-foldable-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    margin-top: 10px;
    background: var(--bg-input);
    border: 1px dashed var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    color: var(--text-secondary);
}

.nested-foldable-header:hover {
    border-color: var(--accent-info);
    color: var(--accent-info);
    background: var(--accent-info-dim);
}

.nested-foldable-header.active {
    border-style: solid;
    border-color: var(--accent-info);
    border-radius: 6px 6px 0 0;
    border-bottom: none;
    color: var(--accent-info);
}

.nested-chevron {
    width: 14px;
    height: 14px;
    transition: transform 0.2s;
}

.nested-foldable-header.active .nested-chevron {
    transform: rotate(180deg);
}

.nested-foldable-content {
    display: none;
    background: var(--bg-input);
    border: 1px solid var(--accent-info);
    border-top: none;
    border-radius: 0 0 6px 6px;
    padding: 14px;
}

.nested-foldable-content.active {
    display: block;
}

/* Steps Container */
.steps-container {
    font-size: 0.75rem;
}

.step-group {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--border-color);
}

.step-group:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.step-group-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--accent-info);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 8px;
    padding: 8px 10px;
    background: var(--bg-secondary);
    border-radius: 4px;
    border-left: 2px solid var(--border-color);
}

.step-item.highlight {
    border-left-color: var(--accent-primary);
    background: var(--accent-primary-dim);
}

.step-item.result {
    border-left-color: var(--accent-success);
    background: var(--accent-success-dim);
}

.step-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.625rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 20px;
}

.step-content {
    flex: 1;
}

.step-desc {
    color: var(--text-secondary);
    margin-bottom: 4px;
    line-height: 1.4;
}

.step-math {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    padding: 6px 10px;
    border-radius: 4px;
    overflow-x: auto;
    white-space: nowrap;
}

/* ============================================
    Info Buttons
    ============================================ */
.info-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.info-btn {
    flex: 1 1 auto;
    min-width: fit-content;
    padding: 10px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.info-btn:hover {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

/* ============================================
    Modal
    ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 14, 20, 0.85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 24px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    max-width: 700px;
    width: 100%;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-secondary);
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.modal-body h3 {
    font-size: 0.9375rem;
    font-weight: 700;
    margin: 20px 0 12px;
    color: var(--accent-primary);
}

.modal-body h3:first-child {
    margin-top: 0;
}

.modal-body p {
    margin-bottom: 12px;
}

.modal-body ul, .modal-body ol {
    margin: 12px 0;
    padding-left: 24px;
}

.modal-body li {
    margin-bottom: 6px;
}

.modal-body code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    background: var(--bg-input);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--accent-info);
}

.modal-body .equation {
    display: block;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-primary);
    padding: 16px 20px;
    border-radius: 8px;
    margin: 16px 0;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    text-align: center;
    color: var(--text-primary);
}

.modal-body .warning-box {
    background: var(--accent-warning-dim);
    border: 1px solid rgba(234, 179, 8, 0.3);
    border-radius: 8px;
    padding: 14px 18px;
    margin: 16px 0;
    font-size: 0.875rem;
}

.modal-body .warning-box strong {
    color: var(--accent-warning);
}

.modal-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 0.8125rem;
}

.modal-body th, .modal-body td {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.modal-body th {
    background: var(--bg-secondary);
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.modal-body td {
    color: var(--text-primary);
}

.modal-body a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: opacity 0.15s;
}

.modal-body a:hover {
    text-decoration: underline;
    opacity: 0.8;
}

/* ============================================
    Disclaimer & Footer
    ============================================ */
.disclaimer-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 24px;
}

.disclaimer-content {
    padding: 24px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    text-align: center;
    opacity: 0.8;
}

.disclaimer-content strong {
    color: var(--text-secondary);
    font-weight: 600;
}

footer {
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
    margin-top: 0;
}

.footer-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 16px;
    font-size: 0.8125rem;
    transition: color 0.15s;
}

.footer-links a:hover {
    color: var(--accent-primary);
}

/* ============================================
    Disclaimer Box
    ============================================ */
.disclaimer-box {
    background: var(--accent-warning-dim);
    border: 1px solid var(--accent-warning);
    border-left: 4px solid var(--accent-warning);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
}

.disclaimer-title {
    color: var(--accent-warning);
    font-size: 0.75rem;
    text-transform: uppercase;
    margin-bottom: 10px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.05em;
}

.disclaimer-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.disclaimer-text p {
    margin-bottom: 8px;
}

.disclaimer-text p:last-child {
    margin-bottom: 0;
}

.disclaimer-text strong {
    color: var(--text-primary);
}

/* ============================================
    Responsive
    ============================================ */
@media (max-width: 768px) {
    .toggle-grid {
        grid-template-columns: 1fr;
    }

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

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ========================================
    VALIDATION MODAL STYLES
    ======================================== */
.validation-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

.validation-modal.active {
    opacity: 1;
    visibility: visible;
}

.validation-content {
    background: var(--bg-card);
    border-radius: 12px;
    max-width: 700px;
    width: 90%;
    max-height: 85vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
}

.validation-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.validation-header h2 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    font-family: 'Space Grotesk', sans-serif;
    color: var(--text-primary);
}

.validation-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 8px;
    line-height: 1;
    border-radius: 4px;
    transition: background 0.15s, color 0.15s;
}

.validation-close:hover {
    background: var(--bg-input);
    color: var(--text-primary);
}

.validation-summary {
    padding: 16px 24px;
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    border-bottom: 1px solid var(--border-color);
}

.validation-results {
    padding: 16px 24px;
    overflow-y: auto;
    flex: 1;
}

.validation-test {
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
    border: 1px solid;
}

.validation-test.passed {
    background: rgba(34, 197, 94, 0.1);
    border-color: var(--accent-success);
}

.validation-test.failed {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--accent-error);
}

.validation-test:last-child {
    margin-bottom: 0;
}

.validation-test-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.validation-test-name {
    font-weight: 600;
    font-family: 'Space Grotesk', sans-serif;
    color: var(--text-primary);
}

.validation-test-status {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    font-weight: 600;
}

.validation-test.passed .validation-test-status {
    color: var(--accent-success);
}

.validation-test.failed .validation-test-status {
    color: var(--accent-error);
}

.validation-test-inputs {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.validation-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}

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

.validation-table th {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    color: var(--text-secondary);
}

.validation-table td {
    font-family: 'JetBrains Mono', monospace;
}

.validation-table .check-pass {
    color: var(--accent-success);
}

.validation-table .check-fail {
    color: var(--accent-error);
    font-weight: 600;
}

.validation-warning {
    margin-top: 12px;
    padding: 10px 14px;
    background: rgba(245, 158, 11, 0.1);
    border-left: 3px solid var(--accent-warning);
    border-radius: 4px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.validation-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
    display: flex;
    justify-content: flex-end;
}

.validation-btn {
    padding: 10px 24px;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: opacity 0.15s;
}

.validation-btn:hover {
    opacity: 0.9;
}

/* ========================================
    CALCULATION TRAIL STYLES
    ======================================== */
.calc-trail-section {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.calc-trail-section:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.calc-trail-section h4 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin: 0 0 12px 0;
}

.calc-step {
    background: var(--bg-input);
    border-radius: 6px;
    padding: 12px;
    border-left: 3px solid var(--accent-primary);
}

.step-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
    flex-wrap: wrap;
    gap: 8px;
}

.step-formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    color: var(--accent-primary);
    font-weight: 500;
    margin-bottom: 8px;
}

.step-inputs {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.step-calc {
    margin-top: 8px;
}

.step-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.step-input {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    color: var(--text-primary);
}

.step-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.step-result {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-success);
}

.trail-copy-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.8125rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s;
}

.trail-copy-btn:hover {
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
}