:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #1e293b;
    --muted: #64748b;
    --border: #e2e8f0;
    --danger: #dc2626;
    --ok: #16a34a;
    --warn: #d97706;
    --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    font-size: 16px;
    line-height: 1.6;
}

main {
    max-width: 720px;
    margin: 0 auto;
    padding: 16px 16px 60px;
}

h1 { font-size: 1.3rem; margin: 0; }
h2 { font-size: 1.05rem; margin: 0; }
p { margin: 6px 0; }

.muted { color: var(--muted); font-size: .9rem; }
.center { text-align: center; }

.topbar {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(15, 23, 42, .08);
    padding: 18px;
    margin-bottom: 16px;
}

.card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.notice {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
}

.alert {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    border-radius: 10px;
    padding: 12px 14px;
    margin-bottom: 14px;
}

.alert p { margin: 4px 0; }

.alert-ok {
    background: #f0fdf4;
    border-color: #bbf7d0;
    color: #166534;
}

.btn {
    display: inline-block;
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 10px;
    padding: 10px 18px;
    font-size: .95rem;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.btn-primary:active { background: var(--primary-dark); }

.btn-ghost { background: transparent; }

.btn-block { display: block; width: 100%; }

.btn-sm { padding: 6px 10px; font-size: .85rem; border-radius: 8px; }

.btn-danger { color: var(--danger); border-color: #fecaca; }

.actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 14px;
}

.inline-form { display: inline; }

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-hint { margin: 0 0 12px; }

.form-foot { margin-top: 4px; }

.search-box { margin-bottom: 14px; }

.search-box input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    background: var(--card);
}

.student-grid {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
}

.student-btn {
    width: 100%;
    padding: 10px 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    color: var(--text);
    box-shadow: 0 1px 2px rgba(15, 23, 42, .05);
}

.student-btn:active { background: #eff6ff; border-color: var(--primary); }

.btn-name { font-size: .98rem; line-height: 1.3; }

.btn-progress {
    font-size: .72rem;
    line-height: 1.2;
    padding: 1px 8px;
    border-radius: 999px;
    background: #f1f5f9;
    color: var(--muted);
}

.btn-progress.done { background: #dcfce7; color: var(--ok); font-weight: 600; }

.btn-progress.pending { background: #fef3c7; color: var(--warn); }

.student-grid li.hidden { display: none; }

.filter-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 8px 16px;
    border-radius: 999px;
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: .9rem;
    cursor: pointer;
}

.filter-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    font-weight: 600;
}

.gender-section { margin-bottom: 20px; }

.gender-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: .95rem;
    color: var(--text);
    margin: 0 0 10px;
}

.gender-title .count {
    background: #eef2ff;
    color: var(--primary);
    border-radius: 999px;
    padding: 1px 10px;
    font-size: .8rem;
    font-weight: 500;
}

.footer-note {
    text-align: center;
    margin-top: 28px;
    font-size: .85rem;
}

.footer-note a { color: var(--muted); text-decoration: none; }

/* 验证弹窗 */
.verify-dialog {
    border: none;
    border-radius: 20px;
    padding: 0;
    width: min(90vw, 340px);
    box-shadow: 0 24px 60px rgba(15, 23, 42, .28);
    overflow: hidden;
}

.verify-dialog[open] { animation: dialog-pop .2s ease-out; }

@keyframes dialog-pop {
    from { opacity: 0; transform: scale(.9) translateY(10px); }
    to   { opacity: 1; transform: none; }
}

.verify-dialog::backdrop {
    background: rgba(15, 23, 42, .55);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
}

.verify-form {
    padding: 28px 24px 24px;
    text-align: center;
}

.verify-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 18px rgba(37, 99, 235, .3);
}

.verify-icon svg { width: 28px; height: 28px; }

.verify-form h2 {
    font-size: 1.2rem;
    margin: 0 0 4px;
}

.verify-student {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 18px;
}

.verify-label {
    display: block;
    font-size: .88rem;
    color: var(--muted);
    margin-bottom: 8px;
}

#verifyTail {
    width: 100%;
    padding: 10px 6px;
    font-size: 1.2rem;
    letter-spacing: .3em;
    text-indent: .3em;
    text-align: center;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    background: #f8fafc;
    color: var(--text);
    transition: border-color .15s, box-shadow .15s;
}

#verifyTail:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}

.verify-actions {
    display: flex;
    gap: 10px;
    margin-top: 18px;
}

.verify-actions .btn {
    flex: 1;
    padding: 12px 0;
    border-radius: 12px;
    font-size: 1rem;
}

/* 表单 */
.form label {
    display: block;
    margin-bottom: 16px;
}

.field-label { display: block; margin-bottom: 5px; font-size: .92rem; color: #334155; }

.req { color: var(--danger); }

.form input[type="text"],
.form input[type="tel"],
.form input[type="password"],
.form input[type="number"],
.form input[type="date"],
.form select,
.form textarea {
    width: 100%;
    padding: 11px 13px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    background: #f8fafc;
    color: var(--text);
}

.form textarea { resize: vertical; }

.form input:focus, .form select:focus, .form textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
}

.has-error input, .has-error textarea, .has-error select { border-color: var(--danger) !important; }

.err { color: var(--danger); font-size: .82rem; }

.help { color: var(--muted); font-size: .8rem; display: block; margin-top: 4px; }

.field-help { max-width: 180px; }

/* 字段两列并排布局 */
.fields-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 12px;
}

.fields-grid .field-cell { min-width: 0; }

.fields-grid .field-cell.full { grid-column: 1 / -1; }

.fields-grid > *:not(.field-cell) { grid-column: 1 / -1; }

.fields-grid .form-grid,
.fields-grid .checkbox-group { grid-column: 1 / -1; }

.field-section {
    grid-column: 1 / -1;
    margin: 20px 0 10px;
    font-size: .98rem;
    color: var(--primary);
    border-left: 3px solid var(--primary);
    padding-left: 10px;
}

.field-section:first-child { margin-top: 0; }

.hidden-field { display: none !important; }

.radio-group {
    display: flex;
    gap: 16px;
    padding: 6px 0;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    margin-bottom: 0 !important;
    font-size: 1rem;
    color: var(--text);
}

.radio-option input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
    flex-shrink: 0;
}

.radio-option.on {
    color: var(--primary);
    font-weight: 600;
}

.quick-guardian {
    grid-column: 1 / -1;
    background: #eff6ff;
    border: 1px dashed #bfdbfe;
    border-radius: 12px;
    padding: 12px;
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    font-size: .9rem;
    margin-bottom: 8px;
}

.quick-guardian .btn { margin: 0; }

.quick-hint {
    width: 100%;
    margin: 2px 0 0;
    font-size: .8rem;
}

.badge-btn {
    border: 1px solid var(--border);
    background: #f1f5f9;
    color: var(--muted);
    border-radius: 999px;
    padding: 4px 12px;
    font-size: .8rem;
    cursor: pointer;
}

.badge-btn-on {
    background: #fee2e2;
    color: var(--danger);
    border-color: #fecaca;
    font-weight: 600;
}

.batch-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 10px;
    margin-bottom: 12px;
}

.batch-tip { font-size: .88rem; color: var(--muted); }

.th-check, .td-check { width: 32px; text-align: center; }

.th-check input, .td-check input { width: 16px; height: 16px; cursor: pointer; }

.form-inline {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.form-inline input[type="text"],
.form-inline input[type="tel"] {
    flex: 1;
    min-width: 120px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: .95rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 14px;
}

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

.checkbox-group { display: flex; gap: 18px; align-items: center; }

.checkbox-group label { margin-bottom: 0; display: flex; align-items: center; gap: 6px; }

.checkbox-group input { width: auto; }

/* 成功页 */
.center-page {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.success-card { text-align: center; padding: 36px 24px; }

.success-card .actions { justify-content: center; }

.success-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 12px;
    border-radius: 50%;
    background: var(--ok);
    color: #fff;
    font-size: 2rem;
    line-height: 64px;
}

/* 安装/登录页 */
.install-page { padding-top: 8vh; }

.install-card, .login-card { max-width: 440px; margin: 0 auto; }

code {
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 6px;
    font-size: .85em;
}

.reset-warn {
    background: #fef3c7;
    border: 1px solid #fde68a;
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 14px;
    font-size: .9rem;
}

.reset-warn label { display: flex; gap: 8px; align-items: flex-start; margin: 0; }

.reset-warn input { width: auto; margin-top: 3px; }

/* 管理后台 */
.admin-topbar { position: static; }

.admin-nav {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 8px 16px;
}

.admin-nav a {
    white-space: nowrap;
    padding: 8px 14px;
    border-radius: 10px;
    color: var(--muted);
    text-decoration: none;
    font-size: .9rem;
}

.admin-nav a.active {
    background: #eff6ff;
    color: var(--primary);
    font-weight: 600;
}

.stat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
    margin-bottom: 16px;
}

.stat-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 16px 10px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(15, 23, 42, .08);
}

.stat-card strong { display: block; font-size: 1.6rem; }

.stat-card span { font-size: .82rem; color: var(--muted); }

.stat-card.ok strong { color: var(--ok); }

.stat-card.warn strong { color: var(--warn); }

.stat-card.male strong { color: #2563eb; }

.stat-card.female strong { color: #ec4899; }

.admin-main { max-width: 1100px; }

.gender-badge {
    display: inline-block;
    min-width: 34px;
    text-align: center;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: .82rem;
    background: #f1f5f9;
    color: var(--muted);
}

.gender-badge.male { background: #dbeafe; color: #1d4ed8; }

.gender-badge.female { background: #fce7f3; color: #db2777; }

.table-scroll { overflow-x: auto; }

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: .9rem;
}

.table th, .table td {
    text-align: left;
    padding: 10px 8px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.table th { color: var(--muted); font-weight: 500; white-space: nowrap; }

.row-actions { white-space: nowrap; }

.row-actions .inline-form { display: inline-flex; gap: 6px; margin-left: 6px; }

.row-disabled { opacity: .55; }

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: .8rem;
    background: #f1f5f9;
    color: var(--muted);
}

.badge-ok { background: #dcfce7; color: var(--ok); }

.badge-warn { background: #fef3c7; color: var(--warn); }

.input-sm {
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 100%;
    min-width: 90px;
    font-size: .9rem;
}

.student-list { display: flex; flex-direction: column; gap: 10px; }

.student-row {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.student-row .input-sm { flex: 1; min-width: 90px; }

.student-row .tail { max-width: 130px; }

.student-row .row-actions { display: flex; gap: 6px; }

.steps {
    padding-left: 18px;
    color: #334155;
    font-size: .92rem;
    margin: 10px 0 18px;
}

.steps li { margin-bottom: 5px; }

@media (max-width: 480px) {
    main { padding: 12px 12px 50px; }
    .topbar { padding: 12px; }
    .form-grid { grid-template-columns: 1fr; }
    .verify-dialog { width: min(82vw, 300px); }
    .verify-form { padding: 18px 14px 16px; }
    .verify-icon { width: 42px; height: 42px; margin-bottom: 10px; }
    .verify-icon svg { width: 20px; height: 20px; }
    .verify-student { font-size: 1.1rem; margin-bottom: 10px; }
    #verifyTail { font-size: 1.05rem; padding: 8px 4px; letter-spacing: .25em; }
    .verify-actions { margin-top: 12px; }
    .verify-actions .btn { padding: 10px 0; font-size: .95rem; }
}