* {
    box-sizing: border-box;
}

:root {
    --bg: #f6f9ff;
    --panel: #ffffff;
    --panel-soft: #f9fbff;
    --text: #21314f;
    --muted: #677895;
    --primary: #3f7cff;
    --primary-weak: #ebf2ff;
    --border: #dde7f8;
    --danger: #df5252;
    --success: #1f9d66;
    --shadow: 0 8px 20px rgba(60, 90, 140, 0.08);
}

body {
    margin: 0;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
}

.app-layout {
    display: grid;
    grid-template-columns: 208px minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    background: #fff;
    border-right: 1px solid var(--border);
    padding: 18px 12px;
    display: flex;
    flex-direction: column;
}

.sidebar h1 {
    margin: 0 0 12px;
    padding: 0 8px;
    font-size: 18px;
}

.sidebar ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sidebar li + li {
    margin-top: 6px;
}

.sidebar a {
    display: block;
    padding: 9px 10px;
    border-radius: 10px;
    color: #4b5f84;
    text-decoration: none;
}

.sidebar a:hover,
.sidebar a.active {
    color: #2452c2;
    background: var(--primary-weak);
}

.sidebar-user {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding: 12px 8px 0;
}

.sidebar-user p {
    margin: 0 0 8px;
    font-size: 13px;
}

.sidebar-user a {
    color: #d04a4a;
    padding: 0;
}

.content {
    min-width: 0;
    padding: 18px;
}

.content-inner {
    max-width: 920px;
}

h2 {
    margin: 0;
    font-size: 24px;
}

h3 {
    margin: 0 0 8px;
    font-size: 17px;
}

p {
    color: var(--muted);
    margin: 8px 0 0;
}

.panel {
    width: 100%;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px;
    box-shadow: var(--shadow);
    display: grid;
    gap: 12px;
}

.section-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    background: var(--panel-soft);
}

.form-grid {
    display: grid;
    gap: 10px;
}

.form-grid.two-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.form-grid.three-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.item-grid {
    grid-template-columns: 1.2fr 1.2fr 0.8fr 1.4fr;
}

.full-width {
    grid-column: 1 / -1;
}

label {
    display: grid;
    gap: 6px;
    font-weight: 600;
    font-size: 14px;
    color: #2f4368;
}

input,
textarea,
select,
button {
    font: inherit;
}

input,
textarea,
select {
    width: 100%;
    border: 1px solid #cedbf2;
    border-radius: 9px;
    padding: 9px 10px;
    background: #fff;
    color: var(--text);
    outline: none;
}

input:focus,
textarea:focus,
select:focus {
    border-color: #8caefc;
    box-shadow: 0 0 0 3px rgba(74, 126, 255, 0.15);
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.item-row {
    border: 1px dashed #c8d8f4;
    border-radius: 10px;
    padding: 10px;
    background: #fff;
}

.item-row + .item-row {
    margin-top: 8px;
}

.form-actions {
    display: flex;
    gap: 10px;
}

button {
    border: none;
    border-radius: 9px;
    padding: 9px 13px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
}

button.secondary {
    background: #95a5c0;
}

button.danger,
.danger {
    margin-top: 8px;
    background: var(--danger);
}

.alert {
    margin: 12px 0;
    padding: 11px 12px;
    border-radius: 10px;
    font-weight: 600;
}

.alert.success {
    background: #e8f8f0;
    border: 1px solid #bde8d1;
    color: #15784c;
}

.alert.error {
    background: #feefef;
    border: 1px solid #f4c7c7;
    color: #ab2d2d;
}

.result-wrap {
    margin-top: 12px;
}

.result-card {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
    background: #fff;
}

.result-card + .result-card {
    margin-top: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 8px;
    border-radius: 8px;
    overflow: hidden;
}

th,
td {
    border: 1px solid var(--border);
    padding: 8px;
    text-align: left;
    font-size: 14px;
}

th {
    background: #f0f5ff;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-top: 12px;
}

.stat-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px;
    box-shadow: var(--shadow);
}

.stat-card h3 {
    margin-bottom: 8px;
    color: #5e7192;
    font-size: 14px;
}

.stat-card strong {
    font-size: 22px;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
}

.login-wrap {
    width: 100%;
    max-width: 420px;
}

.login-panel {
    gap: 10px;
}

@media (max-width: 900px) {
    .app-layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .content {
        padding: 14px;
    }

    .form-grid.two-cols,
    .form-grid.three-cols,
    .item-grid {
        grid-template-columns: 1fr;
    }

    .section-head {
        align-items: flex-start;
        flex-direction: column;
    }
}