/* ==========================================================================
   Septic Tank Size Calculator Pro – Scoped Styles (prefix: stc-)
   All styles are scoped under .stc-tool
   ========================================================================== */

.stc-tool {
    /* Variables – can be overridden by parent theme, but scoped */
    --stc-primary: #3B82F6;
    --stc-primary-hover: #5A9CFF;
    --stc-primary-text: #FFFFFF;
    --stc-bg: #111318;
    --stc-surface: #1A1D23;
    --stc-border: #2C2F38;
    --stc-text: #E3E5E9;
    --stc-text-secondary: #A0A4B0;
    --stc-danger: #EF4444;
    --stc-warning: #F59E0B;
    --stc-success: #10B981;
    --stc-focus-ring: 2px solid var(--stc-primary-hover);
    --stc-radius: 10px;
    --stc-transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;

    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: var(--stc-text);
    background-color: var(--stc-bg);
    padding: 2rem;
    line-height: 1.5;
    max-width: 960px;
    margin: 0 auto;
}

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

/* ---------- Typography ---------- */
.stc-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #FFFFFF;
}

.stc-subtitle {
    color: var(--stc-text-secondary);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.stc-disclaimer-note {
    font-size: 0.85rem;
    color: var(--stc-warning);
    margin-bottom: 1.5rem;
}

.stc-section-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #FFFFFF;
}

/* ---------- Mode Selector ---------- */
.stc-mode-selector {
    border: 0;
    margin-bottom: 2rem;
}

.stc-mode-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.stc-mode-tab {
    padding: 0.6rem 1.2rem;
    background: transparent;
    border: 1px solid var(--stc-border);
    border-radius: var(--stc-radius);
    color: var(--stc-text-secondary);
    cursor: pointer;
    font-weight: 500;
    transition: var(--stc-transition);
    outline: none;
}

.stc-mode-tab:hover {
    border-color: var(--stc-primary);
    color: #FFFFFF;
}

.stc-mode-tab:focus-visible {
    box-shadow: 0 0 0 2px var(--stc-primary-hover);
    border-color: var(--stc-primary);
}

.stc-mode-tab.stc-active,
.stc-mode-tab[aria-checked="true"] {
    background: rgba(59, 130, 246, 0.18);
    border-color: var(--stc-primary);
    color: #FFFFFF;
    font-weight: 600;
}

/* ---------- Input Form ---------- */
.stc-calculator {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stc-input-row {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.stc-field {
    flex: 1 1 200px;
}

.stc-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.4rem;
    color: var(--stc-text-secondary);
}

.stc-input,
.stc-select {
    width: 100%;
    padding: 0.65rem 0.8rem;
    background-color: var(--stc-surface);
    border: 1px solid var(--stc-border);
    border-radius: var(--stc-radius);
    color: var(--stc-text);
    font-size: 1rem;
    transition: var(--stc-transition);
    outline: none;
}

.stc-input:focus,
.stc-select:focus {
    border-color: var(--stc-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25);
}

.stc-hint {
    font-size: 0.8rem;
    color: var(--stc-text-secondary);
    margin-top: 0.25rem;
    display: block;
}

.stc-input-with-unit {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stc-input-with-unit .stc-input {
    flex: 1;
}

.stc-unit {
    font-size: 0.9rem;
    color: var(--stc-text-secondary);
    white-space: nowrap;
}

/* ---------- Radio / Unit Selector ---------- */
.stc-unit-selector {
    border: 0;
    padding: 0;
}

.stc-radio-group {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.stc-radio-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    color: var(--stc-text);
}

.stc-radio-input {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--stc-border);
    border-radius: 50%;
    background: transparent;
    transition: var(--stc-transition);
    position: relative;
    cursor: pointer;
}

.stc-radio-input:checked {
    border-color: var(--stc-primary);
    background: var(--stc-primary);
    box-shadow: inset 0 0 0 4px var(--stc-bg);
}

.stc-radio-input:focus-visible {
    outline: var(--stc-focus-ring);
    outline-offset: 2px;
}

/* ---------- Buttons ---------- */
.stc-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.stc-button {
    padding: 0.7rem 1.5rem;
    border-radius: var(--stc-radius);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--stc-transition);
    border: 1px solid transparent;
    outline: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.stc-button:focus-visible {
    box-shadow: 0 0 0 2px var(--stc-primary-hover);
    outline: none;
}

.stc-button-primary {
    background: var(--stc-primary);
    color: var(--stc-primary-text);
    border-color: var(--stc-primary);
}

.stc-button-primary:hover {
    background: var(--stc-primary-hover);
    border-color: var(--stc-primary-hover);
    transform: translateY(-1px);
}

.stc-button-secondary {
    background: rgba(59, 130, 246, 0.12);
    color: #F1F3F9;
    border-color: transparent;
}

.stc-button-secondary:hover {
    background: rgba(59, 130, 246, 0.22);
    color: #FFFFFF;
}

.stc-button-outline {
    background: transparent;
    color: var(--stc-text-secondary);
    border: 1px solid var(--stc-border);
}

.stc-button-outline:hover {
    border-color: var(--stc-primary);
    color: #FFFFFF;
    background: rgba(59, 130, 246, 0.08);
}

/* ---------- Result Cards ---------- */
.stc-results {
    margin-top: 2.5rem;
}

.stc-result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
    margin: 1rem 0 1.5rem;
}

.stc-card {
    background: var(--stc-surface);
    border: 1px solid var(--stc-border);
    border-radius: var(--stc-radius);
    padding: 1.2rem;
    text-align: center;
    transition: var(--stc-transition);
}

.stc-card--primary {
    border-color: var(--stc-primary);
    background: rgba(59, 130, 246, 0.08);
}

.stc-card-header {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--stc-text-secondary);
    margin-bottom: 0.5rem;
}

.stc-card-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: #FFFFFF;
    word-break: break-word;
}

.stc-card-sub {
    font-size: 0.85rem;
    color: var(--stc-text-secondary);
    margin-top: 0.3rem;
}

.stc-result-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.stc-copy-feedback {
    font-size: 0.9rem;
    color: var(--stc-success);
    min-height: 1.2rem;
}

/* ---------- Warnings ---------- */
.stc-warnings {
    margin-top: 1rem;
}

.stc-warning-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stc-warning-item {
    background: rgba(245, 158, 11, 0.08);
    border-left: 3px solid var(--stc-warning);
    padding: 0.6rem 1rem;
    border-radius: 6px;
    color: var(--stc-warning);
    font-size: 0.9rem;
}

/* ---------- Education / SEO ---------- */
.stc-education {
    margin-top: 2.5rem;
    background: var(--stc-surface);
    border: 1px solid var(--stc-border);
    border-radius: var(--stc-radius);
    padding: 1.5rem;
}

.stc-formula-box {
    background: rgba(59, 130, 246, 0.06);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
}

.stc-formula-box code {
    display: block;
    margin: 0.5rem 0;
    font-size: 1.1rem;
    color: var(--stc-primary-hover);
}

.stc-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.95rem;
}

.stc-table th,
.stc-table td {
    padding: 0.7rem;
    border: 1px solid var(--stc-border);
    text-align: left;
}

.stc-table th {
    background: rgba(255, 255, 255, 0.05);
    color: #FFFFFF;
}

/* ---------- SEO Content & FAQ ---------- */
.stc-seo-content,
.stc-faq {
    margin-top: 2.5rem;
    color: var(--stc-text-secondary);
}

.stc-seo-content h2,
.stc-faq h2 {
    color: #FFFFFF;
    margin-top: 1.8rem;
}

.stc-faq-list {
    margin: 1rem 0;
}

.stc-faq-list dt {
    font-weight: 600;
    color: var(--stc-text);
    margin-top: 1.2rem;
    cursor: default;
}

.stc-faq-list dd {
    margin-left: 0;
    margin-top: 0.4rem;
    color: var(--stc-text-secondary);
}

/* ---------- Disclaimer ---------- */
.stc-disclaimer {
    margin-top: 2.5rem;
    padding: 1.2rem;
    border: 1px solid var(--stc-warning);
    border-radius: var(--stc-radius);
    background: rgba(245, 158, 11, 0.05);
    font-size: 0.9rem;
}

.stc-disclaimer strong {
    color: var(--stc-warning);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
    .stc-tool {
        padding: 1.25rem;
    }

    .stc-title {
        font-size: 1.5rem;
    }

    .stc-mode-tabs {
        flex-direction: column;
    }

    .stc-input-row {
        flex-direction: column;
    }

    .stc-result-grid {
        grid-template-columns: 1fr;
    }

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