.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.88);
    z-index: 3000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.modal-overlay.open {
    opacity: 1;
    visibility: visible;
}

.modal-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 50px;
    max-width: 560px;
    width: 100%;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s;
}

.modal-overlay.open .modal-box {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-gray);
    background: none;
    border: none;
    transition: color 0.2s;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-white);
}

.modal-box h3 {
    font-family: var(--font-display);
    font-size: 2.2rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.modal-box>p {
    font-size: 0.88rem;
    color: var(--text-gray);
    margin-bottom: 30px;
    line-height: 1.6;
}

.size-calc {
    background: var(--black);
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 24px;
    margin-bottom: 28px;
}

.size-calc label {
    font-family: var(--font-condensed);
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-gray);
    display: block;
    margin-bottom: 10px;
}

.size-calc-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

.size-calc input {
    flex: 1;
    padding: 11px 14px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text-white);
    border-radius: 3px;
    outline: none;
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.size-calc input:focus {
    border-color: var(--cyan);
}

.size-calc-btn {
    padding: 11px 20px;
    background: var(--cyan);
    border: none;
    color: var(--black);
    font-family: var(--font-condensed);
    font-weight: 900;
    font-size: 0.8rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.size-calc-btn:hover {
    box-shadow: 0 0 20px var(--cyan-glow);
}

.size-result {
    margin-top: 14px;
    font-family: var(--font-display);
    font-size: 1.6rem;
    letter-spacing: 2px;
    color: var(--cyan);
    display: none;
}

.size-table {
    width: 100%;
    border-collapse: collapse;
}

.size-table th {
    font-family: var(--font-condensed);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--cyan);
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.size-table td {
    padding: 10px 14px;
    font-size: 0.88rem;
    color: var(--text-gray);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.size-table tr:hover td {
    color: var(--text-white);
}

.size-table td:first-child {
    font-family: var(--font-condensed);
    font-weight: 900;
    font-size: 1rem;
    color: var(--text-white);
}

.size-result--ok    { color: var(--cyan); }
.size-result--error { color: var(--error); }