/* ============================================================
   Fasten-Trade Calculator Styles
   Professional, strict, clean design
   Font: Roboto Slab | Accent: #cb0037 | BG: #ffffff
   ============================================================ */

.calc-wrapper {
    font-family: 'Roboto Slab', 'Roboto', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: #2d2d2d;
    background: #ffffff;
    max-width: 960px;
    margin: 0 auto;
    padding: 0;
}

.calc-wrapper h1 {
    font-family: 'Roboto Slab', serif;
    font-size: 26px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0 0 8px 0;
    padding-bottom: 12px;
    border-bottom: 2px solid #cb0037;
    letter-spacing: 0.02em;
}

.calc-wrapper h2 {
    font-family: 'Roboto Slab', serif;
    font-size: 20px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 28px 0 16px 0;
    padding-bottom: 8px;
    border-bottom: 1px solid #e0e0e0;
}

.calc-wrapper h3 {
    font-family: 'Roboto Slab', serif;
    font-size: 17px;
    font-weight: 600;
    color: #1a1a1a;
    margin: 20px 0 12px 0;
}

.calc-wrapper p {
    margin: 0 0 14px 0;
    line-height: 1.75;
}

.calc-wrapper a {
    color: #cb0037;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.calc-wrapper a:hover {
    color: #a0002c;
    border-bottom-color: #cb0037;
}

.calc-section {
    background: #ffffff;
    border-left: 4px solid #cb0037;
    padding: 24px 28px;
    margin: 24px 0;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.calc-section h2 {
    margin-top: 0;
}

.calc-form {
    background: #fafafa;
    padding: 20px 24px;
    margin: 16px 0;
    border-left: 3px solid #cb0037;
}

.calc-form label {
    display: block;
    font-weight: 600;
    color: #1a1a1a;
    margin: 12px 0 4px 0;
    font-size: 14px;
}

.calc-form select,
.calc-form input[type="number"],
.calc-form input[type="text"] {
    width: 100%;
    max-width: 400px;
    padding: 10px 12px;
    border: 1px solid #d0d0d0;
    font-family: inherit;
    font-size: 15px;
    color: #2d2d2d;
    background: #ffffff;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.calc-form select:focus,
.calc-form input:focus {
    border-color: #cb0037;
    outline: none;
    box-shadow: 0 0 0 2px rgba(203,0,55,0.1);
}

.calc-form .input-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.calc-form .input-group > div {
    flex: 1;
    min-width: 180px;
}

.calc-btn {
    display: inline-block;
    padding: 12px 32px;
    background: #cb0037;
    color: #ffffff;
    border: none;
    font-family: 'Roboto Slab', serif;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin: 16px 0;
    transition: background 0.2s;
}

.calc-btn:hover {
    background: #a0002c;
}

.calc-btn-print {
    background: #555555;
    margin-left: 8px;
}

.calc-btn-print:hover {
    background: #333333;
}

.calc-result {
    background: #ffffff;
    border: 1px solid #e0e0e0;
    border-left: 4px solid #2d7d2d;
    padding: 20px 24px;
    margin: 16px 0;
    display: none;
}

.calc-result.visible {
    display: block;
}

.calc-result h3 {
    color: #2d7d2d;
    margin-top: 0;
}

.calc-result table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 14px;
}

.calc-result table th {
    background: #2d7d2d;
    color: #ffffff;
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
}

.calc-result table td {
    padding: 10px 14px;
    border-bottom: 1px solid #e8e8e8;
}

.calc-result table tr:nth-child(even) td {
    background: #f9f9f9;
}

.calc-result .result-value {
    font-size: 22px;
    font-weight: 700;
    color: #cb0037;
}

.calc-result .result-label {
    font-size: 13px;
    color: #777777;
}

.normative-block {
    background: #fafafa;
    border-top: 3px solid #cb0037;
    padding: 16px 20px;
    margin: 24px 0 0 0;
    font-size: 14px;
}

.normative-block h3 {
    margin-top: 0;
    font-size: 15px;
}

.normative-block ul {
    list-style: none;
    padding: 0;
    margin: 8px 0;
}

.normative-block ul li {
    padding: 4px 0 4px 16px;
    border-left: 2px solid #e0e0e0;
    margin: 0;
    font-size: 13px;
    color: #555555;
}

.normative-block ul li:hover {
    border-left-color: #cb0037;
    color: #2d2d2d;
}

.calc-error {
    background: #fff5f5;
    border: 1px solid #eecccc;
    border-left: 4px solid #cc0000;
    padding: 12px 16px;
    margin: 12px 0;
    color: #990000;
    font-size: 14px;
    display: none;
}

.calc-error.visible {
    display: block;
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
    body * {
        visibility: hidden;
    }
    .calc-wrapper,
    .calc-wrapper * {
        visibility: visible;
    }
    .calc-wrapper {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        max-width: 100%;
        color: #000000;
    }
    .calc-btn,
    .calc-btn-print {
        display: none;
    }
    .calc-section {
        box-shadow: none;
        border-left: 2px solid #000000;
        break-inside: avoid;
    }
    .calc-result table th {
        background: #000000;
    }
    .normative-block {
        border-top-color: #000000;
    }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .calc-wrapper {
        font-size: 15px;
        padding: 0 8px;
    }
    .calc-section {
        padding: 16px;
    }
    .calc-form {
        padding: 14px;
    }
    .calc-form .input-group {
        flex-direction: column;
    }
    .calc-form select,
    .calc-form input {
        max-width: 100%;
    }
}