html, body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

:root {
    --theme-primary: #2563a8;
    --theme-accent: #d97706;
    --theme-fg: #1f2933;
    --theme-muted: #6b7280;
    --theme-subtle: #9aa3af;
    --theme-bg: #f5f6f8;
    --theme-surface: #ffffff;
    --theme-surface-hover: #f1f3f5;
    --theme-border: #e2e5e9;
    --theme-border-subtle: #eef0f3;
    --theme-success: #16a34a;
    --theme-warning: #d97706;
    --theme-danger: #dc2626;
    --theme-info: #2563eb;
    --theme-success-soft: #dcfce7;
    --theme-warning-soft: #fef3c7;
    --theme-danger-soft: #fee2e2;
    --theme-info-soft: #dbeafe;
    --theme-accent-soft: #fdf2e3;
    --theme-primary-soft: #eef4fb;
}

.page-header {
    margin-bottom: 24px;
}

    .page-header h1 {
        margin: 0;
        font-size: 24px;
        font-weight: 700;
        color: var(--theme-primary);
    }

    .page-header .page-sub {
        margin: 4px 0 0;
        color: var(--theme-muted);
        font-size: 14px;
    }

.studio-card {
    background: var(--theme-surface);
    border: 1px solid var(--theme-border);
    border-radius: 8px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
    padding: 16px;
}

.error-card {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--theme-danger);
    border-color: var(--theme-danger);
}

.capitalize {
    text-transform: capitalize;
}

.conf-chip {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    text-transform: capitalize;
}

    .conf-chip.conf-high {
        background: var(--theme-success-soft);
        color: #14532d;
    }

    .conf-chip.conf-medium {
        background: var(--theme-warning-soft);
        color: #78350f;
    }

    .conf-chip.conf-low {
        background: var(--theme-danger-soft);
        color: #7f1d1d;
    }

.progress-track {
    background: var(--theme-border-subtle);
    border-radius: 4px;
    height: 6px;
    overflow: hidden;
    width: 100%;
}

    .progress-track .progress-fill {
        height: 100%;
        background: var(--theme-primary);
        transition: width 0.2s;
    }

.indeterminate-bar {
    height: 4px;
    width: 100%;
    background: linear-gradient(90deg, transparent, var(--theme-primary), transparent);
    background-size: 40% 100%;
    background-repeat: no-repeat;
    animation: indeterminate 1.2s infinite linear;
    border-radius: 4px;
    margin: 8px 0;
}

@keyframes indeterminate {
    0% { background-position: -40% 0; }
    100% { background-position: 140% 0; }
}

.studio-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

    .studio-table th {
        text-align: left;
        font-weight: 600;
        color: var(--theme-muted);
        border-bottom: 1px solid var(--theme-border);
        padding: 8px 10px;
    }

    .studio-table td {
        border-bottom: 1px solid var(--theme-border-subtle);
        padding: 8px 10px;
    }

h1:focus {
    outline: none;
}

a, .btn-link {
    color: #006bb7;
}

.btn-primary {
    color: #fff;
    background-color: #1b6ec2;
    border-color: #1861ac;
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

.content {
    padding-top: 1.1rem;
}

h1 {
    font-size: 1.6rem;
}

h2 {
    font-size: 1.25rem;
}

.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid #e50000;
}

.validation-message {
    color: #e50000;
}

.loading-shell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    gap: 1rem;
    color: #5b6470;
}

.loading-spinner {
    width: 3rem;
    height: 3rem;
    border: 0.35rem solid #d6d9de;
    border-top-color: #1b6ec2;
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

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

#blazor-error-ui {
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
    }

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmcnIGhlaWdodD0nMjEnIHN0cm9rZT0nIzAwMCcgdmlld0JveD0nMCAwIDIxIDIxJyB3aWR0aD0nMjEnPjxnIGZpbGw9J25vbmUnIGZpbGwtcnVsZT0nZXZlbm9kZCcgdHJhbnNmb3JtPSd0cmFuc2xhdGUoMiAyKSc+PHBhdGggZD0nbTMuNiAzLjZoMTNhMiAyIDAgMCAxIDIgMnYxMGEyIDIgMCAwIDEtMiAyaC0xM2EyIDIgMCAwIDEtMi0ydi0xMGEyIDIgMCAwIDEgMi0yeicvPjxwYXRoIGQ9J20zLjYgMy42IDcuNCA2LjQgNy40LTYuNCcvPjwvZz48L3N2Zz4=) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

    .blazor-error-boundary::after {
        content: "An error has occurred."
    }

.toast-stack {
    position: fixed;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 1200;
    width: min(90vw, 32rem);
}

.toast-item {
    background: #323232;
    color: #fff;
    border-radius: 6px;
    padding: 0.7rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.3);
}

    .toast-item.error {
        background: #b32121;
    }

    .toast-item button {
        background: none;
        border: none;
        color: inherit;
        font-weight: 600;
        cursor: pointer;
    }

/* ---- Spatial learning blocks ---- */
.block-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.block-section {
    padding: 16px 18px;
}

.block-step {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    margin: 0 0 10px;
    color: var(--theme-fg);
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--theme-primary);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    flex: none;
}

.formula {
    background: var(--theme-surface-hover);
    border: 1px solid var(--theme-border-subtle);
    border-radius: 6px;
    padding: 12px 14px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13px;
    white-space: pre-wrap;
    margin: 0;
    color: var(--theme-fg);
}

.field-map {
    width: 100%;
    max-width: 360px;
    height: auto;
    background: var(--theme-surface-hover);
    border: 1px solid var(--theme-border-subtle);
    border-radius: 6px;
}

.boundary-shape {
    fill: var(--theme-primary-soft);
    stroke: var(--theme-primary);
    stroke-width: 2;
}

.metric-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 12px;
}

.metric {
    flex: 1 1 140px;
    background: var(--theme-surface-hover);
    border: 1px solid var(--theme-border-subtle);
    border-radius: 6px;
    padding: 10px 12px;
}

.metric-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--theme-muted);
}

.metric-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--theme-primary);
}

.metric-sub {
    font-size: 12px;
    color: var(--theme-muted);
}

.sim-steps {
    margin: 0;
    padding-left: 20px;
    color: var(--theme-fg);
}

    .sim-steps li {
        margin-bottom: 4px;
    }

.recommendation {
    color: var(--theme-fg);
}

.quiz {
    border: 1px solid var(--theme-border);
    border-radius: 8px;
    padding: 12px 14px;
    margin-top: 8px;
}

    .quiz legend {
        font-weight: 600;
        padding: 0 6px;
    }

.quiz-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
    cursor: pointer;
}

.check-btn {
    margin-top: 10px;
    background: var(--theme-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 8px 16px;
    font-weight: 600;
    cursor: pointer;
}

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

.quiz-result {
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

    .quiz-result.ok {
        color: var(--theme-success);
    }

    .quiz-result.bad {
        color: var(--theme-danger);
    }

/* Terrain grid */
.terrain-grid {
    display: grid;
    gap: 2px;
    max-width: 360px;
    margin-bottom: 12px;
}

.terrain-cell {
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 3px;
    font-size: 15px;
    color: #1f2933;
}

    .terrain-cell.sink {
        outline: 2px solid var(--theme-info);
        outline-offset: -2px;
        font-weight: 700;
    }

.terrain-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 12px;
    color: var(--theme-muted);
    margin-bottom: 8px;
}

.legend-swatch {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 3px;
    vertical-align: -2px;
    margin-right: 4px;
}

/* ---------------------------------------------------------------------------
   ML / Machine Learning shared styles
   --------------------------------------------------------------------------- */

/* Shared between Insights, Optimizer, Benchmark, Dashboard ML column */
.ml-disclaimer {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    background: var(--theme-info-soft);
    border-color: var(--theme-info);
    font-size: 13px;
    margin-bottom: 20px;
}

.ml-disclaimer .bi {
    color: var(--theme-info);
    flex-shrink: 0;
    font-size: 16px;
    margin-top: 1px;
}

.field-selector-card {
    margin-bottom: 20px;
}

.selector-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--theme-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.selector-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.studio-select {
    padding: 7px 12px;
    border: 1px solid var(--theme-border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--theme-fg);
    background: var(--theme-surface);
    min-width: 200px;
    cursor: pointer;
}

.studio-select:focus {
    outline: none;
    border-color: var(--theme-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 168, 0.12);
}

.explanation-card {
    line-height: 1.6;
}

.explanation-text {
    font-size: 14px;
    color: var(--theme-fg);
    margin-bottom: 12px;
}

.disclaimer-text {
    font-size: 12px;
    color: var(--theme-muted);
    border-top: 1px solid var(--theme-border-subtle);
    padding-top: 10px;
    margin: 0;
}

.btn-primary {
    padding: 7px 18px;
    background: var(--theme-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s;
}

.btn-primary:hover:not(:disabled) { opacity: 0.88; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.dash-placeholder {
    color: var(--theme-subtle);
    font-size: 14px;
}