/* ============================================================
   课堂签到系统 公共样式（自适应：手机/平板/电脑）
   ============================================================ */

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #16a34a;
    --success-light: #dcfce7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --warn: #d97706;
    --warn-light: #fef3c7;
    --gray: #6b7280;
    --gray-light: #f3f4f6;
    --border: #e5e7eb;
    --text: #1f2937;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    color: var(--text);
    background: #f5f7fb;
    font-size: 15px;
    line-height: 1.6;
}

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

/* ---------- 页面背景 ---------- */
.public-bg {
    background: linear-gradient(160deg, #eef4ff 0%, #f0fdf4 55%, #f5f7fb 100%);
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 24px 12px 60px;
}
.admin-bg { background: #f5f7fb; min-height: 100vh; }

/* ---------- 容器 ---------- */
.container-narrow { width: 100%; max-width: 560px; }
.admin-container { max-width: 1080px; margin: 0 auto; padding: 20px 14px 60px; }

/* ---------- 卡片 ---------- */
.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 18px;
}
.public-card { padding: 26px 22px; }
.card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}
.card-head h2 { font-size: 17px; }

/* ---------- 品牌区 ---------- */
.brand { text-align: center; margin-bottom: 20px; }
.brand-sm { margin-bottom: 10px; }
.brand-icon {
    width: 58px; height: 58px;
    margin: 0 auto 10px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 28px;
    line-height: 58px;
    text-align: center;
    box-shadow: 0 6px 16px rgba(37,99,235,.35);
}
.brand h1 { font-size: 22px; margin-bottom: 4px; }
.brand p { color: var(--gray); font-size: 14px; }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-block;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 9px 16px;
    font-size: 14px;
    cursor: pointer;
    text-align: center;
    transition: background .15s, color .15s, border-color .15s;
    background: var(--gray-light);
    color: var(--text);
    line-height: 1.4;
}
.btn:hover { filter: brightness(.96); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; color: #fff; }
.btn-outline { background: #fff; border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 13px 20px; font-size: 16px; border-radius: 10px; }
.btn-sm { padding: 4px 10px; font-size: 13px; border-radius: 6px; }
.btn-block { display: block; width: 100%; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* ---------- 表单 ---------- */
.form-grid { display: flex; flex-direction: column; gap: 14px; }
.form-row { margin-bottom: 4px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.form-inline { display: flex; align-items: center; gap: 8px; }
.inline-flex { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.field-label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.req { color: var(--danger); }
.input {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    background: #fff;
    color: var(--text);
}
.input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.input-lg { padding: 14px 16px; font-size: 17px; border-radius: 10px; }
.input-sm { padding: 6px 10px; font-size: 13px; width: auto; }
textarea.input { resize: vertical; }
.form-tip { font-size: 12px; color: var(--gray); margin-top: 6px; }
.check-label { display: flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; }

/* ---------- 提示条 ---------- */
.alert {
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 14px;
    border: 1px solid transparent;
}
.alert-success { background: var(--success-light); color: #166534; border-color: #bbf7d0; }
.alert-error   { background: var(--danger-light); color: #991b1b; border-color: #fecaca; }
.alert-warn    { background: var(--warn-light); color: #92400e; border-color: #fde68a; }
.alert-info    { background: var(--primary-light); color: #1e40af; border-color: #bfdbfe; }

/* ---------- 签到页表单 ---------- */
.checkin-form { margin-top: 6px; }
.checkin-form .field-label { font-size: 15px; margin-top: 12px; }
.checkin-form .btn { margin-top: 14px; }

.success-box {
    text-align: center;
    padding: 18px 0 8px;
    animation: pop .35s ease;
}
@keyframes pop {
    0% { transform: scale(.8); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}
.success-icon {
    width: 72px; height: 72px;
    margin: 0 auto 12px;
    border-radius: 50%;
    background: var(--success);
    color: #fff;
    font-size: 38px;
    line-height: 72px;
}
.success-text { font-size: 20px; font-weight: 700; color: var(--success); }

/* ---------- 信息栅格（签到页时间） ---------- */
.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 12px 0 6px; }
.info-cell {
    background: var(--gray-light);
    border-radius: 8px;
    padding: 10px 12px;
    text-align: center;
}
.info-label { font-size: 12px; color: var(--gray); }
.info-value { font-size: 16px; font-weight: 600; }

/* ---------- 任务列表 ---------- */
.task-list { display: flex; flex-direction: column; gap: 12px; }
.task-item {
    display: block;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 16px;
    color: var(--text);
    transition: box-shadow .15s, border-color .15s;
}
.task-item:hover { border-color: var(--primary); box-shadow: var(--shadow); color: var(--text); }
.task-item-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.task-title { font-size: 16px; font-weight: 700; }
.task-desc { font-size: 13px; color: var(--gray); margin-top: 4px; }
.task-desc-center { text-align: center; margin: 4px 0 10px; }
.task-time { font-size: 13px; color: var(--gray); margin-top: 6px; }
.task-meta {
    background: #fff; border: 1px solid var(--border); border-radius: 8px;
    padding: 10px 14px; font-size: 13px; color: var(--gray);
    margin-bottom: 16px; word-break: break-all;
}
.task-title-cell { font-weight: 600; }
.task-desc-cell { font-size: 12px; color: var(--gray); }

/* ---------- 标签 ---------- */
.tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 12px;
    white-space: nowrap;
}
.tag-green { background: var(--success-light); color: #166534; }
.tag-red   { background: var(--danger-light); color: #991b1b; }
.tag-gray  { background: #e5e7eb; color: #374151; }

/* ---------- 统计卡片 ---------- */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}
.stat-grid-sm { grid-template-columns: repeat(2, 1fr); max-width: 420px; }
.stat-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 10px;
    text-align: center;
    box-shadow: var(--shadow);
}
.stat-num { font-size: 26px; font-weight: 800; color: var(--primary); }
.stat-ok .stat-num { color: var(--success); }
.stat-bad .stat-num { color: var(--danger); }
.stat-late .stat-num { color: var(--warn); }
.stat-label { font-size: 12px; color: var(--gray); margin-top: 4px; }

/* ---------- 双栏 ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-qr { align-items: start; }

/* ---------- 姓名云 ---------- */
.name-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.name-chip {
    background: var(--gray-light);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 12px;
    font-size: 14px;
}

/* ---------- 最近签到 ---------- */
.recent-list { display: flex; flex-direction: column; }
.recent-row {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 0; border-bottom: 1px dashed var(--border);
}
.recent-row:last-child { border-bottom: none; }
.recent-name { font-weight: 600; min-width: 90px; }
.recent-time { margin-left: auto; font-size: 13px; color: var(--gray); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table { width: 100%; border-collapse: collapse; min-width: 520px; }
.table th, .table td {
    padding: 9px 10px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    font-size: 14px;
    vertical-align: top;
}
.table th { background: var(--gray-light); font-weight: 600; white-space: nowrap; }
.table tr:last-child td { border-bottom: none; }
.table-narrow { min-width: 0; }
.table-narrow th { background: transparent; }

.ops { white-space: nowrap; }
.ops .inline-form { display: inline-block; }
.ops .btn { margin-right: 4px; margin-bottom: 4px; }
.inline-form { display: inline; }

.muted { color: var(--gray); }
.device-cell { max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- 出勤率 ---------- */
.rate { font-weight: 700; }
.rate-good { color: var(--success); }
.rate-mid { color: var(--warn); }
.rate-bad { color: var(--danger); }

/* ---------- 空提示 / 分页 ---------- */
.empty-tip { color: var(--gray); padding: 10px 0; }
.pager { display: flex; align-items: center; gap: 10px; margin-top: 14px; }
.pager-info { font-size: 13px; color: var(--gray); }

/* ---------- 顶栏 ---------- */
.topbar {
    background: #111827;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.topbar-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 52px;
    position: relative;
}
.topbar-brand { color: #fff; font-weight: 700; font-size: 16px; }
.topbar-brand:hover { color: #93c5fd; }
.nav-toggle {
    display: none;
    background: none; border: none;
    color: #fff; font-size: 22px;
    cursor: pointer; padding: 6px;
}
.topnav { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.topnav a {
    color: #cbd5e1;
    padding: 8px 12px;
    font-size: 14px;
    border-radius: 6px;
}
.topnav a:hover { color: #fff; background: rgba(255,255,255,.08); }
.topnav a.active { color: #fff; background: var(--primary); }
.nav-logout { color: #fca5a5 !important; }

/* ---------- 工具栏 ---------- */
.toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 14px;
    margin-bottom: 16px;
}
.toolbar .input { width: auto; min-width: 160px; }

/* ---------- 二维码预览 ---------- */
.qr-preview {
    display: flex;
    justify-content: center;
    padding: 8px 0 14px;
}
.qr-preview img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
}

/* ---------- 页脚链接 ---------- */
.foot-link { text-align: center; margin-top: 18px; font-size: 13px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
    .stat-grid { grid-template-columns: repeat(3, 1fr); }
    .grid-2 { grid-template-columns: 1fr; }
    .form-row-3 { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    body { font-size: 15px; }
    .public-bg { padding: 12px 10px 50px; }
    .card { padding: 16px 14px; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .stat-num { font-size: 22px; }
    .toolbar .input { width: 100%; }
    .topnav {
        display: none;
        position: absolute;
        top: 52px; left: 0; right: 0;
        background: #111827;
        flex-direction: column;
        align-items: stretch;
        padding: 8px 12px 14px;
        border-top: 1px solid rgba(255,255,255,.1);
    }
    .topnav.open { display: flex; }
    .topnav a { padding: 11px 12px; }
    .nav-toggle { display: block; }
    .info-grid { grid-template-columns: 1fr; }
}