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

:root {
    --white: #ffffff;
    --bg-alt: #f0f0f0;
    --black: #000000;
    --text: #171717;
    --gray: #999;
    --gray-dark: #666;
    --gray-light: #e5e7eb;
    --radius: 1rem;
    --font: 'Manrope', sans-serif;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--white);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* === Header === */
.header {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--gray-light);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--black);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.header-phone {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--black);
    text-decoration: none;
    transition: opacity 0.2s;
}

.header-phone:hover { opacity: 0.6; }

/* === Page Title === */
.page-title {
    padding: 3rem 0 1rem;
}

.page-title h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--black);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

/* === Cards === */
.products {
    padding: 2rem 0 5rem;
}

.cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius);
    overflow: hidden;
}

/* === Card Image === */
.card-image {
    width: 100%;
    height: 300px;
    background: var(--bg-alt);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-image::after {
    content: 'Фото изделия';
    color: var(--gray);
    font-size: 0.875rem;
    font-weight: 400;
}

.card-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--black);
    color: var(--white);
    padding: 0.35rem 1rem;
    border-radius: 2rem;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

/* === Card Body === */
.card-body {
    padding: 1.5rem;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.btn-action {
    padding: 0.5rem 1rem;
    background: none;
    border: 1px solid var(--gray-light);
    border-radius: 0.5rem;
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-action:hover {
    border-color: var(--black);
}

.card-link {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-dark);
    text-decoration: none;
    border-bottom: 1px dashed var(--gray);
    margin-bottom: 1.25rem;
    transition: color 0.2s;
}

.card-link:hover { color: var(--black); }

.card-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 0.25rem;
}

.card-price {
    font-size: 2rem;
    font-weight: 800;
    color: var(--black);
    margin-bottom: 1.25rem;
}

.card-price span {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--gray);
}

/* === Buttons === */
.btn-calc {
    display: block;
    width: 100%;
    padding: 0.9rem;
    background: var(--black);
    color: var(--white);
    border: none;
    border-radius: 0.5rem;
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-calc:hover { opacity: 0.85; }

.btn-calc.active {
    background: var(--gray-dark);
}

.btn-secondary {
    padding: 0.4rem 1rem;
    background: none;
    border: 1px solid var(--gray-light);
    border-radius: 0.5rem;
    font-family: var(--font);
    font-size: 0.8rem;
    color: var(--text);
    cursor: pointer;
    transition: border-color 0.2s;
}

.btn-secondary:hover { border-color: var(--black); }

.btn-submit {
    display: block;
    width: 100%;
    padding: 1rem;
    background: var(--black);
    color: var(--white);
    border: none;
    border-radius: 0.5rem;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-submit:hover { opacity: 0.85; }
.btn-submit:disabled { opacity: 0.4; cursor: not-allowed; }

/* === Form === */
.calc-form {
    border-top: 1px solid var(--gray-light);
}

/* Zebra striping */
.form-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
}

.form-row:nth-child(odd) {
    background: var(--white);
}

.form-row:nth-child(even) {
    background: var(--bg-alt);
}

.form-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
    flex-shrink: 0;
    margin-right: 1rem;
}

.form-field {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.form-field input[type="number"],
.form-field input[type="text"],
.form-field input[type="date"],
.form-field select {
    width: 120px;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-light);
    border-radius: 0.5rem;
    font-family: var(--font);
    font-size: 0.85rem;
    color: var(--text);
    background: var(--white);
    transition: border-color 0.2s;
}

.form-field input:focus,
.form-field select:focus {
    outline: none;
    border-color: var(--black);
}

.form-unit {
    font-size: 0.8rem;
    color: var(--gray);
}

/* Checkbox row */
.form-check {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
}

.form-check input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--black);
    cursor: pointer;
    flex-shrink: 0;
}

/* Option row with price */
.form-row--option {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.form-price {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--black);
    white-space: nowrap;
}

/* Full width row */
.form-row--full {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
}

.form-row--full textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-light);
    border-radius: 0.5rem;
    font-family: var(--font);
    font-size: 0.85rem;
    color: var(--text);
    background: var(--white);
    resize: vertical;
    transition: border-color 0.2s;
}

.form-row--full textarea:focus {
    outline: none;
    border-color: var(--black);
}

/* Computed value */
.form-computed {
    font-size: 0.85rem;
    color: var(--gray);
    padding: 0.5rem 0.75rem;
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: 0.5rem;
    min-width: 120px;
    display: inline-block;
}

/* === Collapse === */
.form-collapse {
    border-top: 1px solid var(--gray-light);
}

.form-collapse-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.85rem 1.5rem;
    background: none;
    border: none;
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    transition: color 0.2s;
}

.form-collapse-toggle:hover { color: var(--gray-dark); }

.form-collapse-toggle svg {
    transition: transform 0.2s;
}

.form-collapse-toggle.active svg {
    transform: rotate(180deg);
}

.form-collapse-body {
    border-top: 1px solid var(--gray-light);
}

/* === Total === */
.form-total {
    border-top: 1px solid var(--gray-light);
    padding: 1rem 1.5rem;
}

.form-total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--black);
}

.form-total-price {
    font-size: 1.5rem;
    font-weight: 800;
}

/* Submit */
.form-submit {
    padding: 1rem 1.5rem 1.5rem;
}

/* Success message */
.form-success {
    text-align: center;
    padding: 3rem 1.5rem;
}

.form-success-icon {
    width: 56px;
    height: 56px;
    background: var(--black);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.form-success h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.form-success p {
    font-size: 0.9rem;
    color: var(--gray);
}

/* === Footer === */
.footer {
    border-top: 1px solid var(--gray-light);
    padding: 2rem 0;
}

.footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.footer-logo {
    font-size: 1rem;
    font-weight: 700;
    color: var(--black);
}

.footer-copy {
    font-size: 0.75rem;
    color: var(--gray);
}

/* === Responsive === */
@media (max-width: 768px) {
    .cards { grid-template-columns: 1fr; }

    .page-title h1 { font-size: 2.5rem; }
    .page-title { padding: 2rem 0 0.5rem; }

    .card-price { font-size: 1.75rem; }
    .card-actions { flex-wrap: wrap; }

    .form-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
        padding: 0.65rem 1rem;
    }

    .form-row--option {
        flex-direction: row;
        align-items: center;
    }

    .form-field { width: 100%; }
    .form-field input,
    .form-field select { width: 100%; }

    .form-total { padding: 0.75rem 1rem; }
    .form-submit { padding: 0.75rem 1rem 1.25rem; }
    .form-collapse-toggle { padding: 0.75rem 1rem; }
}

@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .page-title h1 { font-size: 2rem; }
    .card-body { padding: 1rem; }
    .card-image { height: 220px; }
}