/* Calculator Engine — Magistral */
/* Design System: Trust & Authority (UI UX Pro Max) */
/* Style: Professional navy + blue CTA, WCAG AAA */
/* Typography: Calistoga (headings) + Inter (body) */

:root {
    /* Colors — Trust & Authority palette */
    --primary: #0F172A;
    --primary-hover: #1E293B;
    --accent: #0369A1;
    --accent-hover: #075985;
    --accent-light: #E0F2FE;
    --success: #059669;
    --success-hover: #047857;
    --error: #DC2626;
    --error-light: #FEF2F2;
    --bg: #F8FAFC;
    --card-bg: #FFFFFF;
    --text: #020617;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --border-hover: #CBD5E1;
    --muted: #E8ECF1;
    --ring: rgba(3, 105, 161, 0.2);

    /* Spacing — 8dp system */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;

    /* Radii */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows — layered for depth */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-xl: 0 8px 24px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.05);

    /* Typography */
    --font-display: 'Calistoga', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Dark theme */
[data-theme="dark"] {
    --primary: #E2E8F0;
    --accent: #38BDF8;
    --accent-hover: #0EA5E9;
    --accent-light: rgba(56,189,248,0.12);
    --success: #34D399;
    --success-hover: #10B981;
    --error: #F87171;
    --error-light: rgba(248,113,113,0.12);
    --bg: #0F172A;
    --card-bg: #1E293B;
    --text: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border: #334155;
    --border-hover: #475569;
    --muted: #1E293B;
    --ring: rgba(56,189,248,0.25);
}
[data-theme="dark"] .header {
    background: #020617;
}
[data-theme="dark"] .header__text {
    color: #F1F5F9;
}
[data-theme="dark"] .result-total-section {
    background: #0F172A;
    border-top-color: #E2E8F0;
}
[data-theme="dark"] .result-total {
    color: #F1F5F9;
}
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select,
[data-theme="dark"] .form-group textarea {
    background: #1E293B;
    color: #F1F5F9;
    border-color: #334155;
}
[data-theme="dark"] .extras-toggle {
    background: #1E293B;
    border-color: #334155;
    color: #94A3B8;
}
[data-theme="dark"] .category-card__icon {
    background: rgba(56,189,248,0.12);
    color: #38BDF8;
}
[data-theme="dark"] .result-calc-name {
    color: #F1F5F9;
    border-color: #334155;
}
[data-theme="dark"] .cart-item {
    background: #1E293B;
    border-color: #334155;
}
[data-theme="dark"] .toast {
    background: #1E293B;
    color: #F1F5F9;
}

/* Theme toggle button */
.theme-toggle {
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #FFFFFF;
    transition: background var(--transition-fast);
}
.theme-toggle:hover {
    background: rgba(255,255,255,0.2);
}
[data-theme="dark"] .theme-toggle {
    color: #FCD34D;
    background: rgba(252,211,77,0.1);
    border-color: rgba(252,211,77,0.2);
}
.header {
    position: relative;
}

/* Reset */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================
   Header — Trust bar
   ============================ */
.header {
    background: var(--primary);
    padding: var(--space-4) var(--space-6);
    text-align: center;
}
.header__logo-img {
    height: 80px;
    width: auto;
    display: block;
    margin: 0 auto;
}
.header__text {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 400;
    color: #FFFFFF;
    margin-top: var(--space-1);
    letter-spacing: 0.03em;
}

/* ============================
   Sections
   ============================ */
.section {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-4);
}
.section__title {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 400;
    color: var(--primary);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}
.section__subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    font-size: 15px;
    line-height: 1.6;
}

/* ============================
   Categories Grid
   ============================ */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

.category-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    cursor: pointer;
    transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
    text-align: center;
    position: relative;
}
.category-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
    transform: translateY(-2px);
}
.category-card:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}
.category-card:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.category-card__icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    border-radius: var(--radius-md);
    color: var(--accent);
    font-size: 24px;
}
.category-card__name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
    line-height: 1.3;
}
.category-card__desc {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.4;
    display: none;
}

/* ============================
   Form Layout
   ============================ */
.form-layout {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}
.form-panel {
    flex: 1;
}
.result-panel {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
}

/* ============================
   Back Button
   ============================ */
.btn-back {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 14px;
    cursor: pointer;
    padding: var(--space-2) 0;
    font-family: var(--font-body);
    font-weight: 500;
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
}
.btn-back:hover { color: var(--accent-hover); }
.btn-back:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ============================
   Form Groups
   ============================ */
.form-group {
    margin-bottom: var(--space-5);
}
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-2);
    color: var(--text-secondary);
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 16px;
    font-family: var(--font-body);
    color: var(--text);
    background: var(--card-bg);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    min-height: 48px;
}
.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
    border-color: var(--border-hover);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--ring);
}
.form-group input.error,
.form-group select.error {
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}
.form-group .field-error {
    color: var(--error);
    font-size: 13px;
    margin-top: var(--space-1);
    font-weight: 500;
}
.form-group .help-text {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: var(--space-1);
}

/* Number input */
input[type="number"] { -moz-appearance: textfield; }
input[type="number"]::-webkit-inner-spin-button { opacity: 1; }

/* ============================
   Checkbox group
   ============================ */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
    padding: var(--space-2) 0;
    min-height: 44px;
}
.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
    cursor: pointer;
    flex-shrink: 0;
}
.checkbox-group label {
    font-size: 14px;
    font-weight: 400;
    text-transform: none;
    letter-spacing: normal;
    margin-bottom: 0;
    cursor: pointer;
    color: var(--text);
}

/* ============================
   Extras Section
   ============================ */
.extras-section {
    margin-top: var(--space-4);
    margin-bottom: var(--space-5);
}
.extras-toggle {
    background: var(--bg);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px var(--space-4);
    width: 100%;
    text-align: left;
    font-size: 14px;
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color var(--transition-fast), background var(--transition-fast);
    min-height: 48px;
}
.extras-toggle:hover {
    border-color: var(--accent);
    background: var(--accent-light);
}
.extras-arrow {
    transition: transform var(--transition-base);
    font-size: 12px;
}
.extras-toggle.open .extras-arrow { transform: rotate(180deg); }
.extras-fields {
    padding: var(--space-4) 0;
}

/* ============================
   Buttons
   ============================ */
.btn-primary {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    padding: 14px var(--space-6);
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    width: 100%;
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    min-height: 48px;
    letter-spacing: 0.01em;
}
.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 2px 8px rgba(3, 105, 161, 0.3);
}
.btn-primary:active {
    transform: scale(0.98);
}
.btn-primary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}
.btn-primary:disabled {
    background: var(--muted);
    color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
}

.btn-lead {
    background: var(--success);
    margin-bottom: var(--space-2);
}
.btn-lead:hover {
    background: var(--success-hover);
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.3);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px var(--space-6);
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-body);
    cursor: pointer;
    width: 100%;
    transition: border-color var(--transition-fast), background var(--transition-fast);
    min-height: 44px;
}
.btn-secondary:hover {
    border-color: var(--accent);
    background: var(--accent-light);
}
.btn-secondary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ============================
   Result Panel
   ============================ */
.result-placeholder {
    text-align: center;
    color: var(--text-muted);
    padding: var(--space-10) var(--space-4);
    font-size: 14px;
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
}
.result-loading {
    text-align: center;
    padding: var(--space-10) var(--space-4);
}
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--muted);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--space-3);
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-title {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 400;
    color: var(--primary);
    margin-bottom: var(--space-3);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--accent-light);
}
.result-calc-name {
    width: 100%;
    padding: 8px 12px;
    border: 1.5px dashed var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font-body);
    color: var(--text);
    background: transparent;
    margin-bottom: var(--space-3);
    transition: border-color var(--transition-fast);
}
.result-calc-name:focus {
    outline: none;
    border-color: var(--accent);
    border-style: solid;
}
.result-calc-name::placeholder { color: var(--text-muted); }
.result-dimensions {
    font-size: 13px;
    color: var(--accent);
    background: var(--accent-light);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-4);
    font-weight: 500;
}

/* ============================
   Breakdown Table
   ============================ */
.result-breakdown {
    margin-bottom: var(--space-4);
}
.breakdown-row {
    display: flex;
    align-items: baseline;
    padding: 10px 0;
    font-size: 14px;
    border-bottom: 1px solid var(--muted);
    gap: var(--space-2);
}
.breakdown-check {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    flex-shrink: 0;
    cursor: pointer;
    margin-top: 2px;
}
.breakdown-row:has(.breakdown-check:not(:checked)) {
    opacity: 0.4;
    text-decoration: line-through;
}
.breakdown-row:last-child { border-bottom: none; }
.breakdown-item {
    flex: 1;
    color: var(--text);
}
.breakdown-qty {
    color: var(--text-muted);
    font-size: 12px;
    margin: 0 var(--space-2);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}
.breakdown-total {
    font-weight: 700;
    white-space: nowrap;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

/* ============================
   Totals
   ============================ */
.result-total-section {
    background: var(--bg);
    margin: 0 calc(-1 * var(--space-6));
    padding: var(--space-4) var(--space-6);
    margin-bottom: var(--space-4);
    border-top: 2px solid var(--primary);
}
.result-subtotal {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    margin-bottom: var(--space-1);
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}
.result-discount {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: var(--success);
    margin-bottom: var(--space-1);
    font-variant-numeric: tabular-nums;
}
.result-total-line {
    border-top: 1px solid var(--border);
    margin: var(--space-2) 0;
}
.result-total {
    display: flex;
    justify-content: space-between;
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
}

.result-days {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.result-min-order {
    font-size: 13px;
    color: var(--error);
    margin-bottom: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--error-light);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(220, 38, 38, 0.15);
}
.result-disclaimer {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: var(--space-4);
    font-style: italic;
}

.result-error {
    text-align: center;
    padding: var(--space-6) var(--space-4);
    color: var(--error);
}
/* Warning rows in breakdown */
.breakdown-row .breakdown-item:has(+ .breakdown-qty:empty) {
    color: var(--error);
}
.breakdown-warning {
    color: var(--error);
    font-size: 13px;
    font-weight: 500;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--muted);
}

/* ============================
   Modal
   ============================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalIn 0.2s ease;
}
@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(8px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    background: var(--bg);
    border: 1px solid var(--border);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast), color var(--transition-fast);
}
.modal-close:hover {
    background: var(--muted);
    color: var(--text);
}
.modal-content h3 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 400;
    color: var(--primary);
    margin-bottom: var(--space-1);
}
.modal-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: var(--space-6);
}

/* ============================
   Toast
   ============================ */
.toast {
    position: fixed;
    bottom: var(--space-6);
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: #fff;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    z-index: 2000;
    box-shadow: var(--shadow-xl);
    animation: toastIn 0.3s ease;
}
@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ============================
   Cart Panel (multi-category)
   ============================ */
.cart-panel {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-6) var(--space-4);
}
.cart-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}
.cart-header h3 {
    font-family: var(--font-display);
    font-size: 20px;
    color: var(--primary);
}
.cart-badge {
    background: var(--accent);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 12px;
}
.cart-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    margin-bottom: var(--space-2);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.cart-item-name { font-size: 14px; font-weight: 500; }
.cart-item-total { font-size: 14px; font-weight: 700; white-space: nowrap; }
.cart-item-remove {
    background: none; border: none; color: var(--error); cursor: pointer;
    font-size: 18px; padding: 0 var(--space-2); line-height: 1;
}
.cart-total {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    text-align: right;
    padding: var(--space-3) 0;
    border-top: 2px solid var(--primary);
    margin-bottom: var(--space-4);
}
.cart-actions { display: flex; gap: var(--space-2); flex-direction: column; }
.breakdown-warning {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--error);
    font-size: 13px;
    font-weight: 500;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--muted);
}
.breakdown-warning .breakdown-check {
    width: 16px; height: 16px; accent-color: var(--error); cursor: pointer;
}

/* ============================
   Footer
   ============================ */
.footer {
    text-align: center;
    padding: var(--space-6) var(--space-4);
    color: var(--text-muted);
    font-size: 13px;
    border-top: 1px solid var(--border);
    margin-top: var(--space-8);
}

/* ============================
   Tablet (768px+)
   ============================ */
@media (min-width: 768px) {
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-4);
    }
    .category-card { padding: var(--space-6); }
    .category-card__name { font-size: 15px; }
    .category-card__desc { display: block; }
    .category-card__icon { width: 56px; height: 56px; font-size: 28px; }

    .form-layout {
        flex-direction: row;
        align-items: flex-start;
        gap: var(--space-8);
    }
    .form-panel { flex: 1; }
    .result-panel {
        width: 400px;
        flex-shrink: 0;
        position: sticky;
        top: var(--space-4);
    }

    .section { padding: var(--space-10) var(--space-6); }
    .section__title { font-size: 28px; }

    .fields-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--space-4);
    }
}

/* ============================
   Desktop (1280px+)
   ============================ */
@media (min-width: 1280px) {
    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .section { padding: var(--space-12) var(--space-8); }
    .section__title { font-size: 32px; }
    .result-panel { width: 440px; }
}

/* ============================
   Mobile sticky total
   ============================ */
@media (max-width: 767px) {
    .result-panel.has-result {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        box-shadow: 0 -4px 24px rgba(0,0,0,0.12);
        max-height: 60vh;
        overflow-y: auto;
        z-index: 100;
        padding: var(--space-4);
    }
    .form-panel {
        padding-bottom: 220px;
    }
}