/* Caravan Tyre Pressure Calculator v1 - Smarter Towing */

.ctp {
    --ctp-purple: #332869;
    --ctp-purple-light: #4a3d8f;
    --ctp-green: #1b8a2e;
    --ctp-green-bg: #e8f5e9;
    --ctp-amber: #e68a00;
    --ctp-amber-bg: #fff8e1;
    --ctp-red: #c62828;
    --ctp-red-bg: #ffebee;
    --ctp-dark: #1a1a1a;
    --ctp-gray: #666;
    --ctp-light-gray: #999;
    --ctp-border: #ddd;
    --ctp-bg: #f7f8f9;
    --ctp-white: #fff;
    --ctp-radius: 8px;

    max-width: 840px;
    margin: 0 auto;
    padding: 24px 16px;
    font-family: urbane, Montserrat, -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--ctp-dark);
    line-height: 1.5;
}

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

/* Unit Toggles (slide switches) */
.ctp__toggles {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 12px 32px;
    margin-bottom: 24px;
}

.ctp__unit-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.ctp__unit-caption {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--ctp-gray);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-right: 2px;
}

.ctp__unit-text {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--ctp-light-gray);
    transition: color 0.3s;
    user-select: none;
}

.ctp__unit-text--active {
    color: var(--ctp-purple);
}

.ctp__switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.ctp__switch input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.ctp__slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--ctp-purple);
    border-radius: 28px;
    transition: background 0.3s;
}

.ctp__slider::before {
    content: '';
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: var(--ctp-white);
    border-radius: 50%;
    transition: transform 0.3s;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.ctp__switch input:checked + .ctp__slider {
    background: var(--ctp-purple-light);
}

.ctp__switch input:checked + .ctp__slider::before {
    transform: translateX(24px);
}

/* Sections */
.ctp__section {
    background: var(--ctp-white);
    border: 1px solid var(--ctp-border);
    border-radius: var(--ctp-radius);
    padding: 24px;
    margin-bottom: 20px;
}

.ctp__section--action {
    text-align: center;
}

.ctp__section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.ctp__section-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--ctp-purple);
    color: var(--ctp-white);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.ctp__section-label {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--ctp-dark);
}

/* Grid */
.ctp__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

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

/* Fields */
.ctp__field {
    display: flex;
    flex-direction: column;
}

.ctp__field--full-row {
    grid-column: 1 / -1;
}

.ctp__field label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ctp-dark);
    margin-bottom: 4px;
}

.ctp__hint {
    font-size: 0.75rem;
    color: var(--ctp-light-gray);
    margin-top: 3px;
    line-height: 1.3;
}

/* Inputs & Selects */
.ctp__input,
.ctp__select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--ctp-border);
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--ctp-dark);
    background: var(--ctp-white);
    transition: border-color 0.2s;
    -webkit-appearance: none;
    appearance: none;
}

.ctp__select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23666' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
    cursor: pointer;
}

.ctp__input:focus,
.ctp__select:focus {
    outline: none;
    border-color: var(--ctp-purple);
    box-shadow: 0 0 0 2px rgba(51, 40, 105, 0.15);
}

/* Hide number spinners */
.ctp__input::-webkit-outer-spin-button,
.ctp__input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.ctp__input[type=number] {
    -moz-appearance: textfield;
}

.ctp__checkbox {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    accent-color: var(--ctp-purple);
}

/* Load index helper */
.ctp__loadindex {
    margin-top: 8px;
}
.ctp__loadindex-label {
    display: block;
    font-size: 0.75rem;
    color: var(--ctp-light-gray);
    margin-bottom: 4px;
    line-height: 1.3;
}
.ctp__select--sm {
    padding: 7px 28px 7px 10px;
    font-size: 0.85rem;
    background-position: right 10px center;
}

/* Disclaimer checkbox */
.ctp__disclaimer-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    text-align: left;
    font-size: 0.85rem;
    color: var(--ctp-gray);
    margin-bottom: 20px;
    cursor: pointer;
    line-height: 1.4;
}

.ctp__disclaimer-label .ctp__checkbox {
    margin-top: 2px;
}

/* Calculate button */
.ctp__btn {
    display: inline-block;
    background: var(--ctp-purple);
    color: var(--ctp-white);
    padding: 14px 40px;
    border: none;
    border-radius: 6px;
    font-size: 1.05rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.2s, opacity 0.2s, transform 0.2s;
}

.ctp__btn:hover:not(:disabled) {
    background: var(--ctp-purple-light);
    transform: translateY(-1px);
}

.ctp__btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* Inline alert (validation) */
.ctp__alert {
    background: var(--ctp-red-bg);
    border-left: 4px solid var(--ctp-red);
    color: var(--ctp-red);
    text-align: left;
    padding: 14px 18px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.4;
}

/* Results */
.ctp__results {
    margin-top: 24px;
    animation: ctp-fade-in 0.4s ease;
}

@keyframes ctp-fade-in {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Verdict / main result */
.ctp__verdict {
    text-align: center;
    padding: 28px 24px;
    border-radius: var(--ctp-radius);
    margin-bottom: 24px;
}

.ctp__verdict--green {
    background: var(--ctp-green-bg);
    border: 2px solid var(--ctp-green);
}

.ctp__verdict--amber {
    background: var(--ctp-amber-bg);
    border: 2px solid var(--ctp-amber);
}

.ctp__verdict--red {
    background: var(--ctp-red-bg);
    border: 2px solid var(--ctp-red);
}

.ctp__verdict-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ctp-gray);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 8px;
}

.ctp__verdict-value {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 4px;
}

.ctp__verdict--green .ctp__verdict-value { color: var(--ctp-green); }
.ctp__verdict--amber .ctp__verdict-value { color: var(--ctp-amber); }
.ctp__verdict--red .ctp__verdict-value { color: var(--ctp-red); }

.ctp__verdict-secondary {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--ctp-gray);
    margin-bottom: 8px;
}

.ctp__verdict-detail {
    font-size: 0.9rem;
    color: var(--ctp-gray);
    max-width: 560px;
    margin: 0 auto;
}

/* Two-figure comparison (TRA standard + conservative) */
.ctp__figures {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin: 4px 0 14px;
}

.ctp__figure {
    flex: 1;
    max-width: 240px;
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    padding: 14px 12px;
}

.ctp__figure--primary {
    background: var(--ctp-white);
    border-width: 2px;
}

.ctp__verdict--green .ctp__figure--primary { border-color: var(--ctp-green); }
.ctp__verdict--amber .ctp__figure--primary { border-color: var(--ctp-amber); }
.ctp__verdict--red .ctp__figure--primary { border-color: var(--ctp-red); }

.ctp__figure-cap {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--ctp-gray);
    margin-bottom: 4px;
}

.ctp__figure-value {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--ctp-dark);
}

.ctp__verdict--green .ctp__figure--primary .ctp__figure-value { color: var(--ctp-green); }
.ctp__verdict--amber .ctp__figure--primary .ctp__figure-value { color: var(--ctp-amber); }
.ctp__verdict--red .ctp__figure--primary .ctp__figure-value { color: var(--ctp-red); }

.ctp__figure-sub {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ctp-gray);
    margin-top: 2px;
}

/* Warnings */
.ctp__warnings {
    margin-bottom: 24px;
}

.ctp__warnings:empty {
    display: none;
    margin: 0;
}

.ctp__warning-box {
    padding: 14px 18px;
    border-radius: 6px;
    margin-bottom: 10px;
    font-size: 0.88rem;
    line-height: 1.4;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.ctp__warning-box:last-child {
    margin-bottom: 0;
}

.ctp__warning-box--red {
    background: var(--ctp-red-bg);
    border-left: 4px solid var(--ctp-red);
    color: var(--ctp-red);
}

.ctp__warning-box--amber {
    background: var(--ctp-amber-bg);
    border-left: 4px solid var(--ctp-amber);
    color: #8a5600;
}

.ctp__warning-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

/* How we worked this out */
.ctp__working {
    background: var(--ctp-white);
    border: 1px solid var(--ctp-border);
    border-radius: var(--ctp-radius);
    padding: 0 20px;
    margin-bottom: 24px;
}

.ctp__working summary {
    cursor: pointer;
    padding: 16px 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--ctp-purple);
    list-style: none;
}

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

.ctp__working summary::before {
    content: '\25B6';
    display: inline-block;
    margin-right: 8px;
    font-size: 0.7rem;
    transition: transform 0.2s;
}

.ctp__working[open] summary::before {
    transform: rotate(90deg);
}

.ctp__working-body {
    padding-bottom: 16px;
}

.ctp__work-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.ctp__work-item {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas: "label value" "note note";
    row-gap: 2px;
    padding: 10px 0;
    border-top: 1px solid var(--ctp-border);
}

.ctp__work-label {
    grid-area: label;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ctp-dark);
}

.ctp__work-value {
    grid-area: value;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--ctp-purple);
}

.ctp__work-note {
    grid-area: note;
    font-size: 0.75rem;
    color: var(--ctp-light-gray);
}

/* 4 PSI rule check */
.ctp__fourpsi {
    background: var(--ctp-white);
    border: 1px solid var(--ctp-border);
    border-radius: var(--ctp-radius);
    padding: 20px 24px;
    margin-bottom: 24px;
}

.ctp__fourpsi-head {
    font-size: 1rem;
    font-weight: 700;
    color: var(--ctp-dark);
    margin-bottom: 6px;
}

.ctp__fourpsi-intro {
    font-size: 0.85rem;
    color: var(--ctp-gray);
    line-height: 1.5;
    margin: 0 0 16px;
}

.ctp__fourpsi-list {
    margin: 0 0 16px;
    padding-left: 20px;
    font-size: 0.85rem;
    color: var(--ctp-gray);
    line-height: 1.5;
}

.ctp__fourpsi-list li {
    margin-bottom: 6px;
}

.ctp__fourpsi-row {
    display: flex;
    align-items: flex-end;
    gap: 12px;
}

.ctp__fourpsi-row .ctp__field {
    flex: 1;
}

.ctp__btn--secondary {
    padding: 12px 28px;
    font-size: 0.95rem;
    flex-shrink: 0;
}

.ctp__fourpsi-alert {
    background: var(--ctp-red-bg);
    border-left: 4px solid var(--ctp-red);
    color: var(--ctp-red);
    padding: 12px 16px;
    border-radius: 6px;
    margin-top: 14px;
    font-size: 0.88rem;
    font-weight: 600;
}

.ctp__fourpsi-result {
    padding: 14px 18px;
    border-radius: 6px;
    margin-top: 14px;
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.45;
}

.ctp__fourpsi-result--green {
    background: var(--ctp-green-bg);
    border-left: 4px solid var(--ctp-green);
    color: var(--ctp-green);
}

.ctp__fourpsi-result--amber {
    background: var(--ctp-amber-bg);
    border-left: 4px solid var(--ctp-amber);
    color: var(--ctp-amber);
}

.ctp__fourpsi-result--red {
    background: var(--ctp-red-bg);
    border-left: 4px solid var(--ctp-red);
    color: var(--ctp-red);
}

/* Non-dismissible disclaimer block */
.ctp__disclaimer-block {
    background: var(--ctp-bg);
    border-left: 4px solid var(--ctp-purple);
    border-radius: 6px;
    padding: 16px 18px;
    margin-bottom: 24px;
}

.ctp__disclaimer-block p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--ctp-gray);
    line-height: 1.5;
}

/* ── Responsive - Mobile ──────────────────────────────── */
@media (max-width: 600px) {
    .ctp {
        padding: 16px 12px;
    }

    .ctp__grid,
    .ctp__grid--2col {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .ctp__section {
        padding: 16px;
    }

    .ctp__btn {
        width: 100%;
        padding: 14px 20px;
    }

    .ctp__fourpsi-row {
        flex-direction: column;
        align-items: stretch;
    }

    .ctp__figures {
        flex-direction: column;
        align-items: stretch;
    }

    .ctp__figure {
        max-width: none;
    }

    .ctp__verdict-value {
        font-size: 2.4rem;
    }
}