/* ==============================================
   BESS Energy Arbitrage Simulator – Stylesheet
   ============================================== */

/* ── CSS Variables ── */
:root {
    --primary-color:   #046BD2;
    --primary-dark:    #000000;
    --action-color:    #47A854;
    --action-color-dark: #3a8f47;
    --danger-color:    #8a1c1c;
    --negative-color:  #c62828;
    --warning-color:   #e57f1f;
    --maroon-color:    #7b1e2b;
    --text-color:      #111111;
    --text-light:      #505050;
    --panel-bg:        #ffffff;
    --page-bg:         #ffffff;
    --light-bg:        #f8f9fa;
    --muted-bg:        #f0f2f4;
    --border-color:    #c7c7c7;
    --border-strong:   #111111;
    --radius-sm:       0;
    --radius-md:       0;
}

/* ── Container ── */
.bess-simulator-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 24px 24px;
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
    font-size: 15px;
    color: var(--text-color);
    line-height: 1.6;
    background: var(--page-bg);
}

/* Hydrogen page typography hardening */
.h2-case-study-container,
.h2-case-study-container input,
.h2-case-study-container textarea,
.h2-case-study-container select,
.h2-case-study-container button {
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

.etrm-case-study-container,
.etrm-case-study-container input,
.etrm-case-study-container textarea,
.etrm-case-study-container select,
.etrm-case-study-container button {
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

.fleet-case-study-container,
.fleet-case-study-container input,
.fleet-case-study-container textarea,
.fleet-case-study-container select,
.fleet-case-study-container button {
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

/* ── Header ── */
.bess-header {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 28px 8px;
    margin-bottom: 2px;
}

.bess-header-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.78em;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 8px;
}

.bess-header-meta span {
    padding-right: 12px;
    border-right: 1px solid var(--border-color);
}

.bess-header-meta span:last-child {
    border-right: none;
    padding-right: 0;
}

.bess-header h1 {
    margin: 0 0 4px;
    font-size: 2.4em;
    font-weight: 500;
    letter-spacing: -0.03em;
    color: var(--primary-color);
    line-height: 1.2;
    padding-bottom: 6px;
    border-bottom: 3px solid var(--border-strong);
}

.bess-subtitle {
    margin: 0;
    font-size: 1em;
    color: #555;
    line-height: 1.35;
}

/* ── Info Section ── */
.bess-info-section {
    margin-top: 0;
    margin-bottom: 18px;
}

.info-box {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 22px;
    margin-bottom: 8px;
}

.info-box h3 {
    margin-top: 0;
    margin-bottom: 14px;
    font-size: 1.1em;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
}

.info-subheading {
    margin: 18px 0 6px;
    font-size: 0.95em;
    font-weight: 600;
    color: var(--text-color);
}

.info-list {
    margin: 4px 0 10px 18px;
    padding: 0;
    color: #444;
    font-size: 0.93em;
    line-height: 1.75;
}

.bess-diagram-figure {
    float: right;
    margin: 0 0 16px 20px;
    max-width: 240px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.bess-diagram-figure img {
    display: block;
    width: 100%;
    height: auto;
}

.bess-diagram-caption {
    display: block;
    padding: 6px 8px;
    font-size: 0.78em;
    color: #666;
    background: var(--muted-bg);
    text-align: center;
}

/* Hydrogen info section: keep text and diagram aligned with responsive behavior */
.h2-info-section .bess-diagram-figure {
    max-width: 290px;
    margin: 2px 0 14px 22px;
    border: 0;
}

/* Hydrogen page title + tighter subtitle to info-heading spacing */
.h2-case-study-container .bess-header h1 {
    font-weight: 500;
}

.h2-case-study-container .bess-header {
    margin-bottom: 0;
    padding-bottom: 4px;
}

.h2-case-study-container .bess-subtitle {
    margin-bottom: 0;
}

.h2-case-study-container .bess-info-section {
    margin-top: 0;
}

.h2-case-study-container .h2-info-section .info-box {
    padding-top: 10px;
}

/* ── Form Section ── */
.bess-form-section {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px 34px;
    margin-bottom: 28px;
}

.bess-form-section h2 {
    margin: 0 0 6px;
    font-size: 1.3em;
    border-bottom: 2px solid var(--border-strong);
    padding-bottom: 15px;
}

.form-description {
    color: #555;
    font-size: 0.93em;
    margin: 0 0 20px;
}

.form-description-small {
    font-size: 0.88em;
    color: #666;
    margin: 0 0 10px;
}

/* ── Preset Toolbar ── */
.preset-toolbar-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.preset-toolbar-group--section {
    margin-bottom: 16px;
}

.preset-toolbar-stack {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    align-items: start;
    margin-bottom: 16px;
}

.preset-toolbar-title {
    font-size: 0.78em;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #666;
    font-weight: 600;
}

.preset-top-buttons {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    align-items: flex-start;
}

.preset-btn {
    padding: 5px 10px;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
    cursor: pointer;
    font-size: 0.82em;
    font-family: inherit;
    color: var(--text-color);
    border-radius: var(--radius-sm);
    transition: background 0.15s, border-color 0.15s;
    white-space: nowrap;
}

.preset-btn:hover {
    border-color: var(--border-strong);
    background: var(--light-bg);
}

.preset-btn.is-selected {
    background: var(--text-color);
    color: var(--panel-bg);
    border-color: var(--border-strong);
}

/* Location select inside preset toolbar */
.location-select {
    width: 100%;
    padding: 5px 8px;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
    font-family: inherit;
    font-size: 0.88em;
    color: var(--text-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

/* ── Tab Headings ── */
.settings-tab-headings {
    display: flex;
    gap: 2px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 20px;
}

.settings-tab-trigger {
    flex: 1 1 50%;
    width: 50%;
    padding: 8px 18px;
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: 0.9em;
    color: #666;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: color 0.15s, border-color 0.15s;
    text-align: center;
}

.settings-tab-trigger.is-active {
    color: var(--text-color);
    border-bottom-color: var(--text-color);
    font-weight: 600;
}

.settings-tab-panel {
    display: none;
}

.settings-tab-panel.is-active {
    display: block;
}

/* ── Form Grid ── */
.bess-form-grid {
    display: grid;
    gap: 20px;
}

.basic-settings-grid {
    grid-template-columns: 1fr 1fr;
}

.advanced-settings-grid {
    grid-template-columns: 1fr 1fr;
}

.form-group-column {
    background: var(--muted-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 22px 22px 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group-column h3,
.form-group-column h4 {
    margin: 0 0 16px;
    font-size: 1em;
    font-weight: 600;
    color: var(--text-color);
}

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-size: 0.88em;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-color);
}

.form-group input[type="number"],
.form-group textarea {
    width: 100%;
    padding: 7px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.92em;
    color: var(--text-color);
    background: var(--panel-bg);
    box-sizing: border-box;
    transition: border-color 0.15s;
}

.form-group input[type="number"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--border-strong);
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 0.8em;
    color: #777;
}

/* Tooltip */
.tooltip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    position: relative;
    cursor: help;
    margin-left: 4px;
    vertical-align: middle;
    font-weight: normal;
    color: var(--text-light);
    font-size: 0.9em;
}

.tooltip:hover::after {
    content: attr(title);
    position: absolute;
    bottom: 125%;
    left: 0;
    min-width: 200px;
    background: #222;
    color: #fff;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.82em;
    line-height: 1.4;
    white-space: normal;
    z-index: 9999;
    pointer-events: none;
}

/* ── Chemistry Selector ── */
.chemistry-selector {
    display: flex;
    gap: 6px;
    margin-bottom: 6px;
}

.chemistry-btn {
    flex: 1;
    padding: 9px 6px;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
    cursor: pointer;
    text-align: center;
    font-size: 0.83em;
    font-family: inherit;
    color: var(--text-color);
    border-radius: var(--radius-sm);
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    white-space: nowrap;
}

.chemistry-btn:hover {
    border-color: var(--border-strong);
    background: var(--muted-bg);
}

.chemistry-btn.is-selected {
    border-color: var(--border-strong);
    background: var(--text-color);
    color: var(--panel-bg);
    font-weight: 600;
}

#chemistry-hint {
    display: block;
    margin-top: 4px;
    color: #666;
    font-size: 0.82em;
}

/* ── Run Button ── */
.form-group-full {
    margin-top: 22px;
    text-align: center;
}

.run-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--action-color);
    color: var(--panel-bg);
    border: 1px solid var(--action-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.95em;
    font-weight: 600;
    line-height: 1.2;
    min-height: 44px;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}

#run-arbitrage-btn {
    padding: 12px 26px;
}

.run-button:hover {
    background: var(--action-color-dark);
    border-color: var(--action-color-dark);
}

.run-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.button-icon {
    font-size: 1.1em;
    vertical-align: middle;
}

.error-message {
    display: none;
    color: #c62828;
    font-size: 0.88em;
    margin-top: 8px;
}

.error-message.show {
    display: block;
}

/* ── Results Section ── */
.bess-hidden {
    display: none;
}

.bess-results-section {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
}

.bess-results-section h2 {
    margin: 0 0 20px;
    font-size: 1.3em;
    border-bottom: 2px solid var(--border-strong);
    padding-bottom: 15px;
}

.section-icon {
    vertical-align: middle;

}

/* ── KPI Dashboard ── */

/* Hide h3 section headings by default (show only when results are populated) */
.bess-results-section h3 {
    display: none;
}

.bess-results-section.h2-show-headings h3 {
    display: block;
}
.kpi-dashboard {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.kpi-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    text-align: left;
    padding: 20px;
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--border-color);
    transition: border-color 0.2s;
}

.kpi-card:hover {
    border-color: var(--border-strong);
}

.kpi-card.positive {
    border-left-color: #47a854;
}

.kpi-card.negative {
    border-left-color: var(--negative-color);
}

.kpi-card.maroon {
    border-left-color: var(--maroon-color);
}

.kpi-card.warning {
    border-left-color: var(--warning-color);
}

.kpi-card.info {
    border-left-color: var(--border-color);
}

.kpi-label {
    font-size: 0.75em;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #666;
    margin-bottom: 4px;
}

.kpi-number {
    font-size: 1.45em;
    font-weight: 700;
    color: var(--text-color);
    line-height: 1.1;
    word-break: normal;
}

.kpi-card.positive .kpi-number {
    color: #47a854;
}

.kpi-card.negative .kpi-number {
    color: var(--negative-color);
}

.kpi-card.maroon .kpi-number {
    color: var(--maroon-color);
}

.kpi-card.warning .kpi-number {
    color: var(--warning-color);
}

.kpi-unit {
    font-size: 0.82em;
    color: #888;
    margin-top: 0;
}

/* Break-Even Warning Banner */
.kpi-breakeven-warning {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    margin: 10px 0 0;
    border-left: 4px solid #c62828;
    background: #fff5f5;
    color: #b71c1c;
    font-size: 0.92em;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    line-height: 1.5;
}

.kpi-breakeven-warning .dashicons {
    flex-shrink: 0;
    margin-top: 2px;
    color: #c62828;
}

.kpi-breakeven-warning a {
    color: #b71c1c;
    text-decoration: underline;
}

/* ── Charts ── */
.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 28px;
    margin-top: 20px;
}

.chart-container {
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px;
}

/* For hydrogen results: make the third chart use the full row width */
.h2-timeseries-container {
    grid-column: 1 / -1;
}

.h2-timeseries-container canvas {
    max-height: 320px;
}

.chart-container canvas {
    display: block;
    width: 100% !important;
}

.chart-container h3 {
    margin: 0 0 12px;
    font-size: 0.95em;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-strong);
    padding-bottom: 10px;
}

.h2-chart-controls {
    margin: 8px 0 12px;
}

.h2-chart-controls-title {
    font-size: 0.78em;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #666;
    margin-bottom: 6px;
    font-weight: 600;
}

.h2-radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.h2-radio-option {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.86em;
    color: var(--text-color);
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
}

.h2-chart-window-note {
    margin-top: 8px;
    font-size: 0.82em;
    color: #666;
}

.india-resolution-toolbar {
    display: flex;
    justify-content: flex-start;
    margin: 0 0 14px;
}

.india-resolution-pill {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    background: #f1f3f7;
    border: 1px solid #d8dce8;
    border-radius: 999px;
    padding: 2px;
}

.india-resolution-btn {
    border: none;
    background: transparent;
    color: #020244;
    border-radius: 999px;
    padding: 7px 13px;
    font-size: 12px;
    line-height: 1;
    cursor: pointer;
    transition: background-color 0.18s ease, color 0.18s ease;
}

.india-resolution-btn:hover {
    background: #e5eaf7;
}

.india-resolution-btn.is-active {
    background: #020244;
    color: #ffffff;
}

/* ── Insights ── */
.insights-section {
    margin-bottom: 28px;
}

.insights-section h3 {
    font-size: 1.15em;
    margin: 0 0 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 2px solid var(--border-strong);
    padding-bottom: 15px;
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 20px;
}

/* For hydrogen optimization tables: two cards should fill full available width */
.h2-table-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.h2-table-grid .insight-card {
    width: 100%;
}

.insight-card {
    background: var(--light-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 20px;
}

.insight-card h4 {
    margin-top: 0;
    margin-bottom: 18px;
    color: var(--text-color);
    font-size: 1.1em;
    position: relative;
    padding-bottom: 10px;
}

.insight-card h4::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 3px;
    background: var(--border-strong);
}

.simulation-settings-summary {
    margin-bottom: 18px;
}

.settings-summary-card {
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    padding: 16px 18px;
}

.settings-summary-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px 16px;
}

.settings-summary-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.settings-summary-label {
    font-size: 0.76em;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-light);
}

.settings-summary-value {
    font-size: 0.95em;
    color: var(--text-color);
    font-weight: 600;
}

.insight-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95em;
}

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

.insight-label {
    font-weight: 400;
    color: var(--text-color);
}

.insight-value {
    color: var(--text-color);
    font-weight: 700;
}

.insight-subsection {
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-color);
}

.insight-subsection:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.insight-subsection h5 {
    font-size: 0.9em;
    font-weight: 700;
    color: var(--text-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0 0 10px 0;
    padding-bottom: 6px;
    border-bottom: 2px solid var(--accent-color);
}

.insights-list {
    list-style: none;
    padding: 0;
    margin: 10px 0 0 0;
    font-size: 0.9em;
    line-height: 1.6;
}

.insights-list li {
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
    color: var(--text-color);
}

.insights-list li::before {
    content: "▸";
    position: absolute;
    left: 0;
    font-weight: 700;
    color: var(--accent-color);
}

.insights-list strong {
    font-weight: 700;
    color: var(--text-color);
}

/* ── Advanced Details ── */
.advanced-details {
    border: 1px solid var(--border-color);
    background: var(--muted-bg);
    padding: 18px 20px 8px;
    border-radius: var(--radius-sm);
}

.advanced-summary {
    cursor: pointer;
    font-weight: 600;
    margin-bottom: 10px;
    list-style: none;
}

.advanced-summary::-webkit-details-marker {
    display: none;
}

/* ── Sensitivity Dashboard ── */
.sensitivity-dashboard {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 25px;
    margin-top: 30px;
}

.sensitivity-dashboard h3 {
    margin: 0 0 14px;
    color: var(--text-color);
    font-size: 1.2em;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 2px solid var(--border-strong);
    padding-bottom: 15px;
}

.sensitivity-intro {
    font-size: 0.9em;
    color: #555;
    margin: 4px 0 14px;
}

.sensitivity-table-wrap {
    overflow-x: auto;
    margin-top: 4px;
}

.sensitivity-matrix {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9em;
}

.sensitivity-matrix th {
    padding: 8px 14px;
    background: var(--text-color);
    color: var(--panel-bg);
    text-align: center;
    font-weight: 600;
    white-space: nowrap;
}

.sensitivity-matrix th.row-header {
    text-align: left;
}

.etrm-case-study-container .checkbox-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 14px;
    margin-top: 8px;
}

.etrm-case-study-container .checkbox-grid label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.92em;
    color: var(--text-color);
}

.etrm-case-study-container .checkbox-grid input[type="checkbox"] {
    width: 16px;
    height: 16px;
}

.fleet-case-study-container .fleet-info-section .info-box {
    padding-top: 14px;
}

.fleet-case-study-container .summary-table th:first-child,
.fleet-case-study-container .summary-table td:first-child {
    white-space: nowrap;
}

.fleet-case-study-container #fleet-scenario-table .summary-table {
    min-width: 920px;
}

.fleet-case-study-container #fleet-kpi-cards .kpi-card:first-child .kpi-number {
    font-size: 1.05em;
    line-height: 1.25;
}

.fleet-case-study-container .chart-container canvas {
    max-height: 340px;
}

.sensitivity-matrix td {
    padding: 8px 14px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.sensitivity-matrix td.row-header {
    font-weight: 600;
    text-align: left;
    background: var(--light-bg);
    white-space: nowrap;
}

.sensitivity-matrix .cell-green {
    color: #2e7d32;
    font-weight: 700;
}

.sensitivity-matrix .cell-amber {
    color: #e65100;
    font-weight: 600;
}

.sensitivity-matrix .cell-red {
    color: #c62828;
}

.sensitivity-note {
    font-size: 0.8em;
    color: #777;
    margin: 10px 0 0;
    font-style: italic;
}

/* ── Summary Section ── */
.summary-section {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 25px;
    margin-top: 30px;
}

.summary-section h3 {
    margin-top: 0;
    color: var(--text-color);
    font-size: 1.2em;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 2px solid var(--border-strong);
    padding-bottom: 12px;
}

.summary-text {
    line-height: 1.8;
    color: var(--text-color);
    margin: 12px 0;
}

.summary-highlight {
    background-color: var(--muted-bg);
    padding: 12px;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--border-strong);
    margin: 12px 0;
}

.summary-highlight.is-positive {
    border-left-color: var(--action-color);
}

.summary-highlight.is-negative {
    border-left-color: var(--maroon-color);
}

.summary-highlight-title {
    font-size: 1.2em;
}

.summary-highlight-title.is-positive,
.summary-text .is-positive {
    color: var(--action-color);
}

.summary-highlight-title.is-negative,
.summary-text .is-negative {
    color: var(--maroon-color);
}

.summary-text .is-caution {
    color: var(--warning-color);
}

.summary-panel {
    padding: 15px;
    margin-top: 10px;
    line-height: 1.8;
    border: 1px solid var(--border-color);
}

.summary-list {
    margin: 8px 0 15px 20px;
    line-height: 1.8;
}

.summary-table-wrap {
    overflow-x: auto;
    margin-top: 10px;
}

.summary-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    border: none !important;
}

.summary-table th,
.summary-table td {
    padding: 8px 10px;
    border: none !important;
}

.summary-table th {
    text-align: left;
    background: #ffffff;
    color: var(--text-color);
    font-weight: 600;
}

.summary-table th:nth-child(n + 2),
.summary-table td:nth-child(n + 2) {
    text-align: right;
}

/* Inner vertical lines only */
.summary-table th + th,
.summary-table td + td {
    border-left: 1px solid var(--border-strong) !important;
}

/* Inner horizontal lines only */
.summary-table tbody td {
    border-top: 1px solid var(--border-strong) !important;
}

.summary-table tbody tr:first-child td {
    border-top: 2px solid var(--border-strong) !important;
}

.summary-table th:nth-child(2),
.summary-table td:nth-child(2) {
    border-left: 2px solid var(--border-strong) !important;
}

.summary-table td.is-negative {
    color: var(--danger-color);
}

.summary-table td.is-positive {
    color: var(--text-color);
}

/* ── Results Actions ── */
.results-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    justify-content: flex-start;
}

.results-error {
    margin-top: 10px;
}

/* Request Demo modal */
body.bashpa-modal-open {
    overflow: hidden;
}

.bashpa-request-demo-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
}

.bashpa-request-demo-modal.is-open {
    display: block;
}

.bashpa-request-demo-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.58);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.bashpa-request-demo-modal__dialog {
    position: relative;
    width: min(780px, 100%);
    max-height: 90vh;
    overflow: auto;
    background: var(--panel-bg);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 20px 20px 18px;
}

.bashpa-request-demo-close {
    position: absolute;
    top: 8px;
    right: 10px;
    border: 0;
    background: transparent;
    color: var(--text-color);
    font-size: 28px;
    line-height: 1;
    cursor: pointer;
    padding: 0;
}

.bashpa-request-demo-modal__dialog h3 {
    display: block;
    margin: 0 0 14px;
    padding-right: 28px;
    font-size: 1.3em;
}

.bashpa-request-demo-form-wrap {
    min-height: 80px;
}

.demo-form-fallback {
    margin: 0;
    color: var(--danger-color);
    font-size: 0.92em;
}

/* ── Disclaimer ── */
.bess-disclaimer {
    margin-top: 20px;
    padding: 12px 16px;
    background: var(--muted-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.8em;
    color: #666;
    line-height: 1.6;
}

/* ── Premium upsell banner ── */
.bess-premium-upsell {
    margin: 32px 0 20px;
    border: 2px solid #f0a500;
    border-radius: var(--radius-sm, 6px);
    background: #fffbf0;
    overflow: hidden;
}
.bess-premium-upsell__inner {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 24px 28px;
}
.bess-premium-upsell__icon {
    font-size: 2.4rem;
    flex-shrink: 0;
    line-height: 1;
}
.bess-premium-upsell__heading {
    margin: 0 0 8px;
    font-size: 1.15em;
    font-weight: 700;
    color: #92540a;
}
.bess-premium-upsell__text {
    margin: 0 0 12px;
    font-size: 0.95em;
    color: #555;
    line-height: 1.6;
}
.bess-premium-upsell__feature-list {
    margin: 0 0 18px;
    padding: 0;
    list-style: none;
    font-size: 0.9em;
    color: #444;
}
.bess-premium-upsell__feature-list li {
    padding: 3px 0;
}
.bess-premium-upsell__cta {
    display: inline-block;
    padding: 10px 22px;
    background: #f0a500;
    color: #fff !important;
    font-weight: 700;
    font-size: 0.95em;
    border-radius: 4px;
    text-decoration: none;
    transition: background 0.2s;
}
.bess-premium-upsell__cta:hover {
    background: #d4900a;
}
.bess-premium-upsell__login-hint {
    margin: 12px 0 0;
    font-size: 0.85em;
    color: #777;
}
@media (max-width: 540px) {
    .bess-premium-upsell__inner {
        flex-direction: column;
        gap: 12px;
    }
}


/* ── Premium lock overlay ── */
.bess-locked-section {
    position: relative;
    min-height: 80px;
    pointer-events: none;
}
.bess-locked-section > *:not(.bess-lock-overlay) {
    filter: blur(4px);
    user-select: none;
}
.bess-lock-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.72);
    backdrop-filter: blur(2px);
    border-radius: var(--radius-sm, 6px);
    gap: 10px;
    z-index: 10;
    pointer-events: none;
}
.bess-lock-icon {
    font-size: 2rem;
    line-height: 1;
}
.bess-lock-label {
    font-size: 0.9em;
    font-weight: 600;
    color: #555;
    text-align: center;
    padding: 0 16px;
}
.run-button.is-locked {
    opacity: 0.45;
    cursor: not-allowed;
}

/* ── Case Study Articles ── */
.bess-case-study {
    width: 100%;
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 24px;
    box-sizing: border-box;
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
    font-size: 15px;
    line-height: 1.65;
    color: var(--text-color);
    background: var(--page-bg);
}
.bess-case-study__header {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--panel-bg);
    padding: 18px 24px 16px;
    margin-bottom: 18px;
}
.bess-case-study__label {
    font-size: 0.78em;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-light);
    margin-bottom: 8px;
}
.bess-case-study__title {
    font-size: 2.05em;
    font-weight: 500;
    line-height: 1.18;
    margin: 0 0 10px;
    color: var(--primary-color);
    padding-bottom: 10px;
    border-bottom: 3px solid var(--border-strong);
}
.bess-case-study__meta {
    font-size: 0.82em;
    color: var(--text-light);
    margin: 0;
}
.bess-case-study__section {
    margin-bottom: 18px;
    padding: 22px 24px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--panel-bg);
}
.bess-case-study__section h2 {
    font-size: 1.18em;
    font-weight: 600;
    line-height: 1.25;
    border-left: 0;
    border-bottom: 2px solid var(--border-strong);
    padding: 0 0 12px;
    margin: 0 0 14px;
    color: var(--text-color);
}
.bess-case-study__section p {
    margin: 0 0 12px;
    color: var(--text-color);
}
.bess-case-study__section p:last-child {
    margin-bottom: 0;
}
.bess-case-study__section ul {
    margin: 6px 0 0 18px;
    padding: 0;
    color: var(--text-color);
    line-height: 1.75;
}
.bess-case-study__section li {
    margin-bottom: 6px;
}
.bess-case-study__section strong {
    color: var(--text-color);
    font-weight: 700;
}
.bess-case-study__table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.88em;
    margin: 16px 0 4px;
    border: none !important;
}
.bess-case-study__table caption {
    text-align: left;
    font-size: 0.85em;
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 6px;
    caption-side: top;
}
.bess-case-study__table th,
.bess-case-study__table td {
    border: none !important;
    padding: 8px 10px;
    text-align: left;
    vertical-align: top;
}
.bess-case-study__table th {
    background: #ffffff;
    color: var(--text-color);
    font-weight: 600;
    border-bottom: 2px solid var(--border-strong) !important;
}
.bess-case-study__table th + th,
.bess-case-study__table td + td {
    border-left: 1px solid var(--border-strong) !important;
}
.bess-case-study__table tbody td {
    border-top: 1px solid var(--border-color) !important;
}
.bess-case-study__table tbody tr:first-child td {
    border-top: 2px solid var(--border-strong) !important;
}
.bess-case-study__cta-section {
    background: var(--muted-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: left;
}
.bess-case-study__cta-section h2 {
    border-bottom-color: var(--border-strong);
}
.bess-case-study__cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    margin-top: 10px;
    padding: 11px 24px;
    background: var(--action-color);
    color: #fff !important;
    border: 1px solid var(--action-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95em;
    line-height: 1.2;
    text-decoration: none;
    transition: background 0.2s, border-color 0.2s;
}
.bess-case-study__cta-btn:hover {
    background: var(--action-color-dark);
    border-color: var(--action-color-dark);
    color: #fff !important;
}
.bess-case-study__footer {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--muted-bg);
    padding: 14px 18px;
    font-size: 0.82em;
    color: var(--text-light);
    line-height: 1.6;
}
.bess-case-study__footer p {
    margin: 0 0 8px;
}
.bess-case-study__footer p:last-child {
    margin-bottom: 0;
}
.bess-case-study__footer a {
    color: var(--primary-color);
    text-decoration: underline;
}
.bess-case-study__disclaimer {
    color: var(--text-light);
    font-style: italic;
}
@media (max-width: 600px) {
    .bess-case-study {
        padding: 0 10px;
        font-size: 14px;
    }
    .bess-case-study__header,
    .bess-case-study__section,
    .bess-case-study__cta-section,
    .bess-case-study__footer {
        padding: 16px 14px;
    }
    .bess-case-study__title { font-size: 1.45em; }
    .bess-case-study__table { font-size: 0.78em; }
    .bess-case-study__table th,
    .bess-case-study__table td { padding: 6px 8px; }
}

/* ── Loading spinner ── */
.loading {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 3px solid rgba(255,255,255,0.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── Responsive ── */
@media (max-width: 960px) {
    .kpi-dashboard {
        grid-template-columns: repeat(3, 1fr);
    }

    .basic-settings-grid,
    .advanced-settings-grid {
        grid-template-columns: 1fr;
    }

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

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

    .preset-toolbar-stack,
    .settings-summary-grid {
        grid-template-columns: 1fr;
    }

    .h2-info-section .bess-diagram-figure {
        max-width: 230px;
        margin-left: 16px;
    }
}

@media (max-width: 768px) {
    .bess-simulator-container {
        padding: 6px 10px 10px;
    }

    .bess-header {
        padding: 12px 14px 8px;
        margin-bottom: 6px;
    }

    .bess-header-meta {
        margin-bottom: 6px;
        letter-spacing: 0.06em;
    }

    .bess-header h1 {
        font-size: 1.8em;
    }

    .settings-tab-trigger {
        width: 50%;
        padding: 10px 12px;
    }

    .bess-form-section {
        padding: 20px;
    }

    .form-group-column {
        padding: 18px;
    }

    .bess-results-section {
        padding: 20px;
    }

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

    .preset-toolbar {
        grid-template-columns: 1fr;
    }

    .chemistry-selector {
        flex-wrap: wrap;
    }

    .chemistry-btn {
        flex: 1 1 45%;
    }

    .kpi-breakeven-warning {
        font-size: 0.87em;
    }

    .bess-diagram-figure {
        float: none;
        max-width: 100%;
        margin: 0 0 16px;
    }

    .h2-info-section .bess-diagram-figure {
        float: none;
        width: min(100%, 290px);
        max-width: 290px;
        margin: 0 auto 16px;
    }

    .h2-info-section .bess-diagram-figure img {
        margin: 0 auto;
    }

    .results-actions {
        flex-direction: column;
    }

    .bashpa-request-demo-modal__backdrop {
        padding: 14px;
        align-items: flex-start;
    }

    .bashpa-request-demo-modal__dialog {
        width: 100%;
        max-height: 92vh;
        margin-top: 12px;
        padding: 18px 14px 14px;
    }
}