/* ============ BASE VARIABLES ============ */
:root {
    --calc-primary: #f0cf4c;
    --calc-primary-dark: #e5c23c;
    --calc-bg: #f5f5f5;
    --calc-surface: #ffffff;
    --calc-surface-hover: #fafafa;
    --calc-text: #333333;
    --calc-text-secondary: #666666;
    --calc-text-muted: #999999;
    --calc-border: #e0e0e0;
    --calc-border-light: #f0f0f0;
    --calc-error: #f44336;
    
    --calc-radius: 8px;
    --calc-radius-lg: 12px;
    --calc-transition: 200ms ease;
}

.calculator-wrap {
    padding: 20px 0 60px;
    background: var(--calc-bg);
    min-height: 100vh;
    overflow-x: hidden;
}
.calculator-wrap--embed {
    min-height: 0;
    padding-top: 0;
    padding-bottom: 40px;
}

.calculator-wrap * { box-sizing: border-box; }

/* ============ BREADCRUMBS ============ */
.calc-breadcrumbs {
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--calc-text-muted);
}
.calc-breadcrumbs a {
    color: var(--calc-text-muted);
    text-decoration: none;
}
.calc-breadcrumbs a:hover {
    color: var(--calc-text);
}

/* ============ MAIN GRID ============ */
.calc-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 0;
    background: var(--calc-surface);
    border-radius: var(--calc-radius-lg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    overflow: hidden;
    min-height: 600px;
    max-width: 100%;
}

@media (max-width: 1024px) {
    .calc-grid { grid-template-columns: 1fr; }
}

/* ============ LEFT PANEL ============ */
.calc-left {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* ============ GROUP TABS ============ */
.calc-tabs {
    display: flex;
    background: var(--calc-surface);
    border-bottom: 1px solid var(--calc-border);
    padding: 0 20px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.calc-tabs::-webkit-scrollbar { display: none; }

.calc-tab {
    position: relative;
    padding: 16px 20px;
    background: transparent;
    border: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--calc-text-muted);
    cursor: pointer;
    transition: all var(--calc-transition);
    white-space: nowrap;
    flex-shrink: 0;
}

.calc-tab:hover { color: var(--calc-text-secondary); }
.calc-tab.active {
    color: var(--calc-text);
    font-weight: 600;
}
.calc-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--calc-primary);
    border-radius: 3px 3px 0 0;
}

/* ============ SECTIONS ============ */
.calc-section {
    padding: 24px 24px 16px;
    border-bottom: 1px solid var(--calc-border-light);
}
.calc-section:last-of-type { border-bottom: none; }

.calc-section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--calc-text);
    margin: 0 0 16px;
}

/* ============ PROFILE GRID ============ */
.calc-profiles {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 12px;
}

@media (max-width: 480px) {
    .calc-profiles {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
}

.calc-profile {
    position: relative;
    padding: 12px 8px;
    background: var(--calc-surface);
    border: 1px solid var(--calc-border);
    border-radius: var(--calc-radius);
    cursor: pointer;
    transition: all var(--calc-transition);
    text-align: center;
}

.calc-profile:hover {
    border-color: var(--calc-primary);
    background: var(--calc-surface-hover);
}

.calc-profile.active {
    border-color: var(--calc-primary);
    background: rgba(240, 207, 76, 0.05);
}

.calc-profile input {
    position: absolute;
    opacity: 0;
}

.calc-profile__radio {
    position: absolute;
    top: 8px;
    left: 8px;
    width: 14px;
    height: 14px;
    border: 2px solid var(--calc-border);
    border-radius: 50%;
    background: white;
}

.calc-profile.active .calc-profile__radio {
    border-color: var(--calc-primary);
    background: var(--calc-primary);
}

.calc-profile__radio::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 5px;
    height: 5px;
    background: white;
    border-radius: 50%;
    opacity: 0;
}

.calc-profile.active .calc-profile__radio::after { opacity: 1; }

.calc-profile__icon {
    width: 60px;
    height: 45px;
    margin: 8px auto 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-profile__icon svg {
    width: 100%;
    height: 100%;
}

.calc-profile__name {
    font-size: 11px;
    font-weight: 500;
    color: var(--calc-text);
    line-height: 1.3;
    display: block;
}

/* ============ FORM ============ */
.calc-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

@media (max-width: 640px) {
    .calc-form { grid-template-columns: 1fr; }
}

.calc-form__col {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.calc-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.calc-field__label {
    font-size: 12px;
    font-weight: 500;
    color: var(--calc-text);
}

.calc-field__label .required { color: var(--calc-error); }

.calc-select {
    width: 100%;
    padding: 12px 40px 12px 12px;
    background: var(--calc-surface);
    border: 1px solid var(--calc-border);
    border-radius: var(--calc-radius);
    font-size: 14px;
    color: var(--calc-text);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23999' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.calc-select:focus {
    outline: none;
    border-color: var(--calc-primary);
}

.calc-select:disabled {
    background-color: var(--calc-border-light);
    cursor: not-allowed;
    opacity: 0.6;
}

.calc-input-wrap {
    position: relative;
}

.calc-input {
    width: 100%;
    padding: 12px 40px 12px 12px;
    background: var(--calc-surface);
    border: 1px solid var(--calc-border);
    border-radius: var(--calc-radius);
    font-size: 14px;
    color: var(--calc-text);
}

.calc-input:focus {
    outline: none;
    border-color: var(--calc-primary);
}

.calc-input__unit {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12px;
    color: var(--calc-text-muted);
}

.calc-hint {
    font-size: 11px;
    color: var(--calc-text-muted);
}

.calc-density-display {
    padding: 12px;
    background: var(--calc-border-light);
    border-radius: var(--calc-radius);
    font-size: 14px;
    color: var(--calc-text);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calc-density-display__value {
    font-weight: 600;
    color: var(--calc-text);
}

/* ============ BUTTON ============ */
.calc-btn-wrap {
    padding: 20px 24px 24px;
    margin-top: auto;
}

.calc-btn {
    width: 100%;
    padding: 16px 24px;
    background: var(--calc-primary);
    border: none;
    border-radius: var(--calc-radius);
    font-size: 15px;
    font-weight: 600;
    color: var(--calc-text);
    cursor: pointer;
    transition: all var(--calc-transition);
}

.calc-btn:hover {
    background: var(--calc-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(240, 207, 76, 0.4);
}

/* ============ RIGHT PANEL ============ */
.calc-right {
    background: #fafafa;
    border-left: 1px solid var(--calc-border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

@media (max-width: 1024px) {
    .calc-right {
        border-left: none;
        border-top: 1px solid var(--calc-border);
    }
}

.calc-right__title {
    font-size: 16px;
    font-weight: 600;
    color: var(--calc-text);
    margin: 0 0 20px;
}

/* ============ DIAGRAM ============ */
.calc-diagram {
    background: white;
    border-radius: var(--calc-radius);
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid var(--calc-border);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-diagram svg {
    max-width: 100%;
    max-height: 160px;
}

/* ============ SPECS ============ */
.calc-specs {
    margin-bottom: 20px;
}

.calc-specs__row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--calc-border-light);
}

.calc-specs__row:last-child { border-bottom: none; }

.calc-specs__label {
    font-size: 13px;
    color: var(--calc-text-muted);
}

.calc-specs__value {
    font-size: 13px;
    font-weight: 500;
    color: var(--calc-text);
}

/* ============ RESULT ============ */
.calc-result {
    background: white;
    border-radius: var(--calc-radius);
    padding: 20px;
    border: 1px solid var(--calc-border);
    margin-top: auto;
    margin-bottom: 16px;
}

.calc-result__label {
    font-size: 12px;
    color: var(--calc-text-muted);
    margin-bottom: 8px;
}

.calc-result__value {
    font-size: 32px;
    font-weight: 700;
    color: var(--calc-text);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.calc-result__unit {
    font-size: 14px;
    font-weight: 500;
    color: var(--calc-text-secondary);
}

/* ============ PDF BUTTON ============ */
.calc-pdf {
    width: 100%;
    padding: 12px 20px;
    background: var(--calc-primary);
    border: none;
    border-radius: var(--calc-radius);
    font-size: 14px;
    font-weight: 500;
    color: var(--calc-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.calc-pdf:hover { background: var(--calc-primary-dark); }

/* ============ MOBILE / ADAPTIVE ============ */
@media (max-width: 768px) {
    .calculator-wrap {
        padding: 12px 0 40px;
    }
    .calculator-wrap .container.category-page {
        padding-left: 12px;
        padding-right: 12px;
        max-width: 100%;
    }
    .calc-grid {
        border-radius: var(--calc-radius);
        min-height: auto;
    }
    .calc-tabs {
        padding: 0 12px;
    }
    .calc-tab {
        padding: 12px 14px;
        font-size: 13px;
    }
    .calc-section {
        padding: 16px 16px 12px;
    }
    .calc-section-title {
        font-size: 13px;
        margin-bottom: 12px;
    }
    .calc-profile__name {
        font-size: 10px;
    }
    .calc-profile__icon {
        width: 48px;
        height: 36px;
    }
    .calc-form {
        gap: 16px;
    }
    .calc-right {
        padding: 16px;
    }
    .calc-diagram {
        padding: 16px;
        min-height: 140px;
    }
    .calc-diagram svg {
        max-height: 120px;
    }
    .calc-result {
        padding: 16px;
    }
    .calc-result__value {
        font-size: 26px;
    }
    .category-hero__title {
        font-size: 18px;
        line-height: 1.35;
    }
    .category-hero__subtitle {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .calculator-wrap .container.category-page {
        padding-left: 10px;
        padding-right: 10px;
    }
    .calc-tab {
        padding: 10px 12px;
        font-size: 12px;
    }
    .calc-section {
        padding: 12px 12px 10px;
    }
    .calc-select,
    .calc-input {
        padding: 10px 36px 10px 10px;
        font-size: 13px;
    }
    .calc-btn {
        padding: 14px 20px;
        font-size: 14px;
    }
    .calc-pdf {
        padding: 10px 16px;
        font-size: 13px;
    }
    .calc-result__value {
        font-size: 22px;
    }
    .calc-specs__row {
        padding: 8px 0;
    }
    .calc-specs__label,
    .calc-specs__value {
        font-size: 12px;
    }
}

/* Ссылки на справочник */
.calc-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: #6586D5;
    font-size: 12px;
    text-decoration: none;
    transition: color 0.2s;
}

.calc-link:hover {
    color: #3E4B68;
    text-decoration: underline;
}

.calc-specs__value[href]:hover {
    text-decoration: underline !important;
}

/* Блок ГОСТов */
.calc-gosts {
    background: white;
    border-radius: var(--calc-radius);
    padding: 12px;
    border: 1px solid var(--calc-border);
    margin-bottom: 16px;
}

.calc-gost-tag {
    display: inline-block;
    padding: 4px 10px;
    background: #f0f4f8;
    border: 1px solid #d0d7de;
    border-radius: 100px;
    font-size: 11px;
    color: #3E4B68;
    text-decoration: none;
    transition: all 0.2s;
}

.calc-gost-tag:hover {
    background: #e1e7ed;
    border-color: #6586D5;
    color: #6586D5;
}