:root[data-theme=light] {
    --text-primary: #1f2937;
}

:root[data-theme=dark] {
    --text-primary: #cbcbcb;
}

.lad-page {
    max-width: 1280px;
    margin: 0 auto;
    box-sizing: border-box;
}

.lad-hero {
    text-align: center;
    margin-bottom: 28px;
}

.lad-hero-badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(59, 130, 246, 0.08);
    color: #2563eb;
    margin-bottom: 12px;
}

.lad-hero-title {
    font-size: 32px;
    font-weight: 800;
    line-height: 1.25;
    margin: 0 0 10px;
}

.lad-hero-title span {
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    -webkit-text-fill-color: transparent;
    -webkit-background-clip: text;
}

.lad-hero-desc {
    max-width: 640px;
    margin: 0 auto;
    font-size: .92rem;
    line-height: 1.6;
}

.lad-card {
    margin-bottom: 24px;
    box-sizing: border-box;
}

.lad-mode-group {
    margin-bottom: 20px;
    padding-bottom: 16px;
}

.lad-radio-group {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: center;
}

.lad-radio-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: .82rem;
    font-weight: 600;
    user-select: none;
}

.lad-radio-label input[type="radio"] {
    width: 14px;
    height: 14px;
    cursor: pointer;
    margin: 0;
    accent-color: #2563eb;
}

.lad-form-row {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    flex-wrap: wrap;
}

.lad-form-group {
    position: relative;
    flex: 1;
    min-width: 140px;
}

.lad-date-group {
    flex: 1.5;
    min-width: 180px;
}

.lad-leap-group {
    flex: 0 0 auto;
    min-width: 120px;
}

.lad-form-section {
    margin-top: 30px;
}
.lad-submit-group {
    flex: 0 0 auto;
    min-width: 120px;
}

.lad-label {
    display: block;
    font-size: .92rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary, #1e293b);
}

.lad-date-hint {
    font-size: 12px;
    font-weight: 400;
    color: #94a3b8;
}

.lad-input {
    width: 100%;
    min-height: 42px;
    padding: 0 12px;
    border: 1px solid var(--border-color, #cbd5e1);
    border-radius: 8px;
    font-size: 15px;
    background: transparent;
    color: inherit;
    box-sizing: border-box;
    transition: border-color .2s;
}

.lad-input:focus {
    border-color: #2563eb;
    outline: none;
}

.lad-input.is-error {
    border-color: #ef4444 !important;
}

.lad-input-err-msg {
    display: block;
    color: #ef4444;
    font-size: 12px;
    margin-top: 5px;
    font-weight: 500;
    line-height: 1.4;
}

.lad-checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    min-height: 42px;
    user-select: none;
}

.lad-checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    margin: 0;
    accent-color: #2563eb;
}

.lad-btn-submit {
    min-height: 42px;
    padding: 0 24px;
    background: #2563eb;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    box-sizing: border-box;
    transition: background-color .2s;
}

.lad-btn-submit:hover {
    background: #1d4ed8;
}

.lad-btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.lad-spinner-svg {
    width: 18px;
    height: 18px;
    animation: lad-spin 1s linear infinite;
    stroke: currentColor;
}

@keyframes lad-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.lad-result-section {
    margin-bottom: 24px;
}

.lad-result-header {
    margin-bottom: 12px;
}

.lad-result-title {
    font-size: .92rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary, #0f172a);
}

.lad-result-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.lad-result-row {
    display: flex;
    align-items: baseline;
    gap: 8px;
    font-size: .92rem;
    line-height: 1.6;
}

.lad-row-spacing {
    margin-top: 8px;
}

.lad-result-label {
    min-width: 100px;
    font-weight: 500;
    color: var(--text-secondary, #64748b);
    flex-shrink: 0;
}

.lad-result-val {
    font-weight: 600;
    color: var(--text-primary, #0f172a);
}

.lad-about-section {
    padding-top: 20px;
    border-top: 1px dashed var(--border-color, #cbd5e1);
}

.lad-about-section p {
    font-size: .92rem;
}
@media (max-width: 640px) {
    .lad-hero-title {
        font-size: 26px;
    }
    .lad-form-row {
        flex-direction: column;
        gap: 14px;
    }
    .lad-form-group {
        width: 100%;
        min-width: 100%;
    }
}