*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: "Segoe UI", system-ui, sans-serif;
    background: #f4f6f8;
    color: #1e293b;
    line-height: 1.6;
    padding: 2rem;
    font-size: 1rem;
}

.form-area {
    max-width: 1100px;
    margin: 0 auto;
}
.form-area label {
    display: block;
    font-size: 1rem;
    margin-bottom: 0.3rem;
    font-weight: 500;
}
.form-area input[type="number"],
.form-area input[type="text"],
.form-area select {
    width: 100%;
    padding: 0.5rem 0.7rem;
    border: 1px solid #cbd5e1;
    border-radius: 5px;
    font-size: 1rem;
    background: #fff;
    transition: border-color 0.15s;
}
.form-area input:focus,
.form-area select:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.18);
}
.form-area input:invalid:not(:placeholder-shown) {
    border-color: #ef4444;
}
.form-area .hint {
    font-size: 1rem;
    color: #64748b;
    margin-top: 0.15rem;
}
.form-area .req {
    color: #ef4444;
    font-weight: 700;
}
.form-area .row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem 1.5rem;
    margin-bottom: 0.7rem;
}
.form-area .row3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.8rem 1.5rem;
    margin-bottom: 0.7rem;
}
.form-area .field {
    margin-bottom: 0.5rem;
}
.form-area .ym {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.section {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 1.4rem 1.6rem;
    margin-bottom: 1.2rem;
}
.section h2 {
    font-size: 1.25rem;
    color: #334155;
    margin-bottom: 0.8rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 0.4rem;
}
.section h3 {
    font-size: 1.1rem;
    color: #475569;
    margin: 0.7rem 0 0.5rem;
}

details.adv {
    margin-top: 0.8rem;
    border-top: 1px dashed #cbd5e1;
    padding-top: 0.6rem;
}
details.adv > summary {
    cursor: pointer;
    font-size: 1rem;
    color: #6366f1;
    font-weight: 600;
    user-select: none;
    list-style: none;
}
details.adv > summary::before {
    content: "▸ ";
}
details.adv[open] > summary::before {
    content: "▾ ";
}
details.adv .adv-body {
    padding-top: 0.6rem;
}

.list-group {
    margin-bottom: 0.6rem;
}
.list-item {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 0.9rem 1.1rem;
    margin-bottom: 0.55rem;
    position: relative;
}
.list-item .item-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}
.list-item .item-head span {
    font-weight: 600;
    font-size: 1.05rem;
    color: #475569;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 1rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}
.btn-add {
    background: #dbeafe;
    color: #2563eb;
    margin-bottom: 0.6rem;
}
.btn-add:hover {
    background: #bfdbfe;
}
.btn-del {
    background: #fee2e2;
    color: #dc2626;
    font-size: 1rem;
    padding: 0.35rem 0.7rem;
}
.btn-del:hover {
    background: #fecaca;
}
.btn-primary {
    background: #3b82f6;
    color: #fff;
    font-size: 1.05rem;
    padding: 0.6rem 1.8rem;
    margin-top: 1rem;
}
.btn-primary:hover {
    background: #2563eb;
}
.btn-secondary {
    background: #e2e8f0;
    color: #334155;
    font-size: 1.05rem;
    padding: 0.6rem 1.4rem;
    margin-top: 1rem;
}
.btn-secondary:hover {
    background: #cbd5e1;
}

.page-head {
    text-align: left;
    margin-bottom: 1.5rem;
}
.page-head h1 {
    font-size: 1.6rem;
    color: #1e40af;
}
.page-head p {
    font-size: 1rem;
    color: #64748b;
}

.actions {
    display: flex;
    gap: 0.8rem;
    justify-content: center;
    flex-wrap: wrap;
}

.val-msg {
    display: none;
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fca5a5;
    border-radius: 6px;
    padding: 0.8rem 2rem;
    font-size: 1rem;
    margin-bottom: 0.8rem;
}
.val-msg.show {
    display: block;
}