/* ===========================================================
   班级管家 · 基础样式（PC 后台与 H5 共用）
   =========================================================== */
:root {
    --primary: #2f6fed;
    --primary-dark: #2456c4;
    --primary-soft: #eaf1ff;
    --success: #16a34a;
    --success-soft: #e7f7ee;
    --warn: #f59e0b;
    --warn-soft: #fef4e2;
    --danger: #dc2626;
    --danger-soft: #fdecec;
    --info: #0ea5e9;
    --info-soft: #e6f6fe;
    --text: #1f2733;
    --text-sub: #5b6675;
    --muted: #8b95a5;
    --border: #e3e8f0;
    --bg: #f4f6fa;
    --card-bg: #ffffff;
    --radius: 10px;
    --radius-sm: 6px;
    --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 4px 16px rgba(16, 24, 40, .04);
    --sidebar-bg: #1f2a44;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; min-height: 100%; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

h1, h2, h3, h4 { margin: 0; font-weight: 600; line-height: 1.4; }
h1 { font-size: 22px; }
h2 { font-size: 18px; }
h3 { font-size: 16px; }
p { margin: 0 0 8px; }

/* ---------------------------------------------------------- 卡片 */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 16px;
    overflow: hidden;
}
.card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}
.card-title { font-size: 16px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.card-title .sub { font-size: 12px; color: var(--muted); font-weight: 400; }
.card-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.card-body { padding: 16px; }
.card-body.no-pad { padding: 0; }
.card-foot { padding: 12px 16px; border-top: 1px solid var(--border); background: #fbfcfe; }

/* ---------------------------------------------------------- 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: .15s ease;
    white-space: nowrap;
    text-decoration: none;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn:active { transform: translateY(1px); }
.btn:disabled, .btn.disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }
.btn-success { background: var(--success); border-color: var(--success); color: #fff; }
.btn-success:hover { filter: brightness(.94); color: #fff; }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(.94); color: #fff; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--primary); }
.btn-ghost:hover { background: var(--primary-soft); }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-lg { padding: 11px 22px; font-size: 15px; }
.btn-block { display: flex; width: 100%; }
.btn-group { display: inline-flex; gap: 6px; flex-wrap: wrap; }

/* ---------------------------------------------------------- 表单 */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px 16px; }
.form-item { margin-bottom: 14px; }
.form-grid .form-item { margin-bottom: 0; }
.form-item > label, .form-label {
    display: block; margin-bottom: 6px; font-size: 13px; color: var(--text-sub); font-weight: 500;
}
.form-item .required::after, label.required::after { content: " *"; color: var(--danger); }
.input, .select, .textarea,
input[type=text], input[type=password], input[type=number], input[type=date],
input[type=datetime-local], input[type=tel], input[type=email], select, textarea {
    width: 100%;
    padding: 8px 10px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: .15s ease;
}
.input:focus, .select:focus, .textarea:focus,
input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(47, 111, 237, .12);
}
textarea, .textarea { min-height: 84px; resize: vertical; }
.input-sm { padding: 4px 8px; font-size: 13px; }
.input-error, .has-error .input { border-color: var(--danger) !important; }
.field-error { display: block; margin-top: 4px; font-size: 12px; color: var(--danger); }
.form-tip { margin-top: 4px; font-size: 12px; color: var(--muted); }
.checkbox, .radio { display: inline-flex; align-items: center; gap: 6px; margin-right: 14px; font-size: 14px; cursor: pointer; }
.checkbox input, .radio input { width: auto; margin: 0; }
.radio-group, .check-group { display: flex; flex-wrap: wrap; gap: 6px 14px; }
.form-actions { display: flex; gap: 10px; align-items: center; margin-top: 18px; flex-wrap: wrap; }

/* 快捷选择按钮组（考勤 / 值日常用） */
.seg-group { display: flex; flex-wrap: wrap; gap: 6px; }
.seg {
    padding: 5px 12px; border: 1px solid var(--border); border-radius: 999px;
    background: #fff; font-size: 13px; cursor: pointer; user-select: none;
}
.seg:hover { border-color: var(--primary); color: var(--primary); }
.seg.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.seg.ok.active { background: var(--success); border-color: var(--success); }
.seg.warn.active { background: var(--warn); border-color: var(--warn); }
.seg.danger.active { background: var(--danger); border-color: var(--danger); }
.seg.info.active { background: var(--info); border-color: var(--info); }

/* ---------------------------------------------------------- 表格 */
.table-wrap { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
.table th { background: #f7f9fc; color: var(--text-sub); font-weight: 600; font-size: 13px; }
.table tbody tr:hover { background: #f9fbff; }
.table td.wrap, .table th.wrap { white-space: normal; min-width: 180px; }
.table-compact th, .table-compact td { padding: 6px 8px; }
.table .col-num { text-align: right; font-variant-numeric: tabular-nums; }
.table tfoot td { background: #f7f9fc; font-weight: 600; }