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

/* CSS 变量定义：中式国风 · 水墨朱砂 */
:root {
    --primary-color: #b03a2e;
    --secondary-color: #8a2a21;
    --paper-color: #f6f1e7;
    --paper-raised: #fdfaf3;
    --paper-tint: #f1ebdc;
    --paper-bright: #fffdf7;
    --paper-status: #f3eee0;
    --ink-color: #2d2a26;
    --ink-strong: #3a3630;
    --ink-soft: #6d6553;
    --ink-faint: #9a917c;
    --line-color: #ddd2ba;
    --line-strong: #c6b898;
    --warning-color: #bf6516;
    --danger-color: #c0392b;
    --font-serif: "Songti SC", "STSong", "SimSun", "Noto Serif CJK SC", serif;
    --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    --border-radius: 14px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 1.3em;
    --font-size-xl: 2em;
}

body {
    font-family: var(--font-sans);
    background-color: var(--paper-color);
    background-image:
        radial-gradient(ellipse 90% 60% at 50% -10%, rgba(58, 54, 48, 0.07), transparent),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
    color: var(--ink-color);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--paper-raised);
    border: 1px solid var(--line-color);
    border-radius: var(--border-radius);
    box-shadow: 0 12px 36px rgba(69, 58, 36, 0.18);
    overflow: hidden;
}

.header {
    background: var(--paper-raised);
    color: var(--ink-color);
    padding: var(--spacing-lg);
    text-align: center;
    position: relative;
}

/* 题签式双钩线：上墨下朱 */
.header::after {
    content: "";
    display: block;
    width: min(460px, 74%);
    margin: 18px auto 0;
    padding-top: 4px;
    border-top: 2px solid var(--ink-strong);
    border-bottom: 1px solid var(--primary-color);
}

.header-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-bottom: 10px;
}

/* 朱文印章：尺寸跟随标题字号，保持与桌面端一致的比例 */
.header-seal {
    width: calc(var(--font-size-xl) * 1.6);
    height: calc(var(--font-size-xl) * 1.6);
    flex: none;
    border-radius: 7px;
}

.header h1 {
    font-family: var(--font-serif);
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 0.12em;
}

.header p {
    font-size: var(--font-size-sm);
    color: var(--ink-soft);
    letter-spacing: 0.05em;
}

.content {
    padding: var(--spacing-lg);
}

.local-save-status {
    background: var(--paper-status);
    border: 1px solid #e2d9c2;
    color: var(--ink-soft);
    border-radius: 8px;
    padding: 10px 12px;
    margin-bottom: var(--spacing-md);
    font-size: 13px;
}

.sync-status {
    display: block;
    margin-bottom: 4px;
    font-weight: 600;
}

.sync-status::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 6px;
    border-radius: 50%;
    background: #a77b22;
}

.sync-status-online::before {
    background: #367346;
}

.sync-status-offline::before {
    background: var(--primary-color);
}

.muted-note {
    color: var(--ink-soft);
    font-size: 0.9em;
}

.file-upload-title {
    font-size: 1.1em;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--primary-color);
}

.file-upload-note {
    color: var(--ink-faint);
    font-size: 0.85em;
}

.button-row-end {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 10px;
}

.student-id-input { width: 80px; }
.student-name-input { width: 120px; }
.full-width { width: 100%; }
.visually-hidden { display: none; }

.section {
    margin-bottom: var(--spacing-lg);
    background: #fbf7ec;
    border-radius: 12px;
    padding: var(--spacing-md);
    border: 1px solid var(--line-color);
    border-left: 4px solid var(--primary-color);
}

[data-admin-only][hidden] {
    display: none !important;
}

.admin-entry-button {
    position: absolute;
    top: 18px;
    right: 20px;
    background: transparent;
    color: var(--ink-soft);
    border: none;
    padding: 6px 4px;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: color 0.2s;
}

.admin-entry-button:hover {
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.admin-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.admin-panel-header .section-title {
    margin-bottom: 0;
}

.admin-logout-button {
    background: transparent;
    color: var(--ink-soft);
    border: 1px solid var(--line-color);
    border-radius: 6px;
    padding: 5px 12px;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
}

.admin-logout-button:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.admin-login-modal {
    position: fixed;
    inset: 0;
    background: rgba(45, 42, 38, 0.55);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.admin-login-modal[hidden] {
    display: none !important;
}

.admin-login-content {
    width: min(420px, 100%);
    background: var(--paper-raised);
    border: 1px solid var(--line-strong);
    border-radius: 12px;
    padding: 26px;
    box-shadow: 0 20px 60px rgba(45, 42, 38, 0.35);
    position: relative;
    animation: modalIn 0.25s ease;
}

.admin-login-content h2 {
    font-family: var(--font-serif);
    color: var(--ink-color);
    margin-bottom: 18px;
}

.admin-login-content input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    background: #fffdf7;
    color: var(--ink-color);
    font-size: var(--font-size-sm);
    margin-bottom: 12px;
}

.admin-login-content input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(176, 58, 46, 0.12);
}

.admin-login-content .btn {
    min-height: 48px;
    padding: 14px 20px;
    font-size: 16px;
    border-radius: 8px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: var(--font-size-lg);
    color: var(--ink-color);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

/* 管理面板：国风书签式页签 */
.admin-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    border-bottom: 2px solid var(--line-strong);
    margin-bottom: var(--spacing-md);
}

.admin-tab {
    font-family: var(--font-serif);
    font-size: 15px;
    letter-spacing: 0.1em;
    padding: 10px 24px;
    background: var(--paper-tint);
    color: var(--ink-soft);
    border: 1px solid var(--line-color);
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    cursor: pointer;
    position: relative;
    top: 2px;
    transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.admin-tab:hover {
    color: var(--primary-color);
    border-color: var(--line-strong);
    background: var(--paper-raised);
    transform: translateY(-3px);
    box-shadow: 0 -4px 10px rgba(69, 58, 36, 0.15);
}

.admin-tab.active:hover {
    background: var(--primary-color);
    transform: none;
    box-shadow: none;
}

.admin-tab.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fdf8ee;
    font-weight: 700;
}

.today-pending-card {
    background: #fffdf7;
    border: 1px solid var(--line-color);
    border-left: 4px solid var(--primary-color);
    border-radius: 10px;
    margin: 0 0 var(--spacing-md);
    padding: 12px 14px;
}

.today-pending-heading {
    align-items: baseline;
    display: flex;
    gap: 10px;
    justify-content: space-between;
}

.today-pending-heading h3 {
    color: var(--ink-color);
    font-family: var(--font-serif);
    font-size: var(--font-size-md);
    margin: 0;
}

.today-pending-heading strong {
    color: var(--primary-color);
    font-family: var(--font-serif);
    font-size: 20px;
}

.today-pending-card p {
    color: var(--ink-soft);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin: 6px 0 0;
    overflow-wrap: anywhere;
}

.today-pending-toggle {
    background: transparent;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: var(--font-size-sm);
    margin-top: 6px;
    padding: 2px 0;
    transition: color 0.2s;
}

.today-pending-toggle:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* 签到日历内的统计图表视图 */
.chart-view {
    display: none;
}

.chart-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
    color: var(--ink-soft);
    font-size: var(--font-size-sm);
}

.chart-controls select {
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    color: var(--ink-color);
    background: var(--paper-bright);
    border: 1px solid var(--line-color);
    border-radius: 8px;
    padding: 6px 10px;
}

.chart-title {
    font-family: var(--font-serif);
    font-size: var(--font-size-md);
    color: var(--ink-strong);
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
    text-align: center;
}

.chart-container {
    width: 100%;
    height: 320px;
}

.chart-daily-trend {
    height: 260px;
}

.table-sort-button {
    appearance: none;
    border: 0;
    padding: 0;
    background: transparent;
    color: inherit;
    font: inherit;
    font-weight: inherit;
    cursor: pointer;
}

.table-sort-button::after {
    content: ' ↕';
    color: var(--ink-faint);
    font-size: 0.85em;
}

th[aria-sort="ascending"] .table-sort-button::after { content: ' ↑'; }
th[aria-sort="descending"] .table-sort-button::after { content: ' ↓'; }

.table-sort-button:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 3px;
}

.chart-fallback {
    padding: var(--spacing-md);
    color: var(--ink-soft);
    font-size: var(--font-size-sm);
    text-align: center;
    border: 1px dashed var(--line-strong);
    border-radius: 8px;
}

.import-methods {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.import-box {
    background: var(--paper-raised);
    border: 1px solid var(--line-color);
    border-radius: 12px;
    padding: var(--spacing-md);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.import-box:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(176, 58, 46, 0.12);
}

.import-label {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: var(--font-size-sm);
}

.date-selector {
    background: var(--paper-tint);
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    padding: 10px;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.date-selector label {
    font-weight: 600;
    color: var(--primary-color);
    font-size: var(--font-size-sm);
}

.date-selector input[type="date"] {
    padding: 8px;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    background: #fffdf7;
    color: var(--ink-color);
    font-size: var(--font-size-sm);
}

textarea {
    width: 100%;
    min-height: 140px;
    padding: 12px;
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    background: #fffdf7;
    color: var(--ink-color);
    font-size: var(--font-size-sm);
    resize: vertical;
    transition: border-color 0.3s, box-shadow 0.3s;
    font-family: var(--font-sans);
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(176, 58, 46, 0.12);
}

.file-upload {
    border: 2px dashed var(--primary-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s;
    background: var(--paper-tint);
}

.file-upload:hover {
    background: #ece2c8;
}

.file-upload.is-dragover {
    background: #ece2c8;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: background-color 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s, transform 0.2s;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    justify-content: center;
    white-space: nowrap;
}

.btn-primary { background: var(--primary-color); color: #fdf8ee; }
.btn-success { background: #3a3630; color: #f6f1e7; }
.btn-danger { background: var(--danger-color); color: #fdf8ee; }
.btn-warning { background: var(--warning-color); color: #fdf8ee; }
.btn-info { background: transparent; color: #3a3630; border: 1px solid #8a8069; }
.btn-secondary { background: var(--paper-tint); color: var(--ink-color); border: 1px solid var(--line-strong); }

/* 印章式描边按钮 */
.btn-seal {
    background: transparent;
    color: var(--primary-color);
    border: 1.5px solid var(--primary-color);
    border-radius: 4px;
    font-family: var(--font-serif);
    letter-spacing: 0.08em;
}

.btn-seal:hover {
    background: var(--primary-color);
    color: #fdf8ee;
}

.btn:focus-visible,
.admin-tab:focus-visible,
.admin-entry-button:focus-visible,
.admin-logout-button:focus-visible,
.today-pending-toggle:focus-visible,
.view-btn:focus-visible,
.report-month-display-button:focus-visible,
.report-month-icon-button:focus-visible,
.report-month-cell:focus-visible,
.report-month-nav-button:focus-visible,
.report-month-title-button:focus-visible,
.month-nav button:focus-visible,
.back-to-top:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(69, 58, 36, 0.25);
}

.form-group {
    display: flex;
    gap: 10px;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

/* 统计报告操作按钮：始终保持一行，两个按钮等宽 */
.report-actions {
    display: flex;
    gap: 10px;
    width: 100%;
}

.report-actions .btn {
    flex: 1;
}

input[type="text"], input[type="number"], input[type="month"] {
    padding: 10px;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    background: #fffdf7;
    color: var(--ink-color);
    font-size: var(--font-size-sm);
}

input[type="text"]:focus, input[type="number"]:focus, input[type="month"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(176, 58, 46, 0.12);
}

.report-month-picker {
    position: relative;
    display: inline-flex;
    align-items: stretch;
    min-width: 190px;
}

.report-month-display-button,
.report-month-icon-button {
    border: 1px solid var(--line-strong);
    background: #fffdf7;
    color: var(--ink-color);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

.report-month-display-button {
    min-width: 142px;
    padding: 10px 12px;
    border-radius: 8px 0 0 8px;
    text-align: left;
    font-weight: 600;
}

.report-month-icon-button {
    width: 44px;
    border-left: 0;
    border-radius: 0 8px 8px 0;
}

.report-month-display-button:hover,
.report-month-icon-button:hover,
.report-month-display-button[aria-expanded="true"],
.report-month-icon-button[aria-expanded="true"] {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--paper-tint);
}

.report-month-popover {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    z-index: 20;
    width: min(280px, calc(100vw - 40px));
    background: var(--paper-raised);
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    box-shadow: 0 16px 40px rgba(69, 58, 36, 0.22);
    padding: 12px;
}

.report-month-popover[hidden] {
    display: none !important;
}

.report-month-picker-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
}

.report-month-nav-button,
.report-month-title-button,
.report-month-cell {
    border: 1px solid var(--line-color);
    background: #fffdf7;
    color: var(--ink-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

.report-month-nav-button {
    width: 36px;
    height: 34px;
}

.report-month-title-button {
    flex: 1;
    height: 34px;
    font-weight: 700;
}

.report-month-grid,
.report-year-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.report-month-cell {
    min-height: 38px;
    font-weight: 600;
}

.report-month-nav-button:hover:not(:disabled),
.report-month-title-button:hover,
.report-month-cell:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--paper-tint);
}

.report-month-cell.selected {
    border-color: var(--primary-color);
    background: #f3dcd7;
    color: var(--primary-color);
}

.report-month-cell:disabled,
.report-month-nav-button:disabled {
    cursor: not-allowed;
    opacity: 0.42;
    background: var(--paper-tint);
}

.search-box {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    background: #fffdf7;
    color: var(--ink-color);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.search-box:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(176, 58, 46, 0.12);
}

/* 表格容器 - 用于移动端横向滚动 */
.table-container {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fffdf7;
    border-radius: 8px;
    overflow: hidden;
    min-width: 600px;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ebe2cc;
    font-size: var(--font-size-sm);
}

th {
    background: #3a3630;
    color: #f6f1e7;
    font-family: var(--font-serif);
    letter-spacing: 0.08em;
    white-space: nowrap;
    border-bottom: 2px solid var(--primary-color);
}

tbody tr {
    transition: background-color 0.15s;
}

tr:hover {
    background: #f5eedd;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.stat-card {
    background: #fffdf7;
    padding: var(--spacing-md);
    border-radius: 10px;
    border: 1px solid var(--line-color);
    border-left: 4px solid var(--primary-color);
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    animation: fadeUp 0.45s ease both;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(69, 58, 36, 0.18);
}

.stat-card:nth-child(2) { animation-delay: 0.05s; }
.stat-card:nth-child(3) { animation-delay: 0.1s; }
.stat-card:nth-child(4) { animation-delay: 0.15s; }

@keyframes fadeUp {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.stat-number {
    font-family: var(--font-serif);
    font-size: var(--font-size-xl);
    font-weight: bold;
    color: var(--primary-color);
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--ink-soft);
    margin-top: 5px;
}

.import-coverage-panel {
    background: #fffdf7;
    border: 1px solid var(--line-color);
    border-radius: 8px;
    padding: 14px;
    margin: 12px 0 16px;
}

.coverage-summary {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 12px;
}

.coverage-summary-item {
    background: var(--paper-tint);
    border-radius: 8px;
    padding: 10px;
    text-align: center;
}

.coverage-summary-value {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 700;
    color: var(--primary-color);
}

.coverage-summary-label {
    color: var(--ink-soft);
    font-size: 12px;
    margin-top: 3px;
}

.import-coverage-calendar {
    display: grid;
    grid-template-columns: repeat(7, minmax(32px, 1fr));
    gap: 6px;
}

.coverage-day {
    min-height: 34px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 13px;
    border: 1px solid transparent;
}

.coverage-day.imported {
    background: #dde8d3;
    border-color: #a3b98c;
    color: #46652f;
}

.coverage-day.missing {
    background: #f3dcd7;
    border-color: #d9a296;
    color: var(--secondary-color);
}

.coverage-day.future {
    background: var(--paper-tint);
    border-color: var(--line-color);
    color: var(--ink-faint);
}

.missing-import-dates {
    color: #8a6410;
    font-size: 13px;
    line-height: 1.5;
    margin-top: 10px;
}

.calendar-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(45, 42, 38, 0.6);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 10px;
}

.calendar-content {
    background: var(--paper-raised);
    border: 1px solid var(--line-strong);
    border-radius: 16px;
    width: 100%;
    max-width: 900px;
    max-height: 95vh;
    overflow-y: auto;
    animation: modalIn 0.25s ease;
    padding: var(--spacing-md);
}

@keyframes modalIn {
    from { transform: scale(0.96); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: 15px;
    border-bottom: 1px solid var(--line-color);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.calendar-heading {
    flex: 1;
    min-width: 0;
}

.calendar-title {
    font-family: var(--font-serif);
    font-size: 1.3em;
    color: var(--primary-color);
    font-weight: bold;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.view-toggle {
    display: flex;
    gap: 5px;
    background: var(--paper-tint);
    padding: 5px;
    border-radius: 8px;
}

.view-btn {
    padding: 6px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
    color: var(--ink-soft);
    transition: background-color 0.3s, color 0.3s;
    font-size: var(--font-size-xs);
}

.view-btn.active {
    background: var(--primary-color);
    color: #fdf8ee;
}

.year-view {
    display: block;
}

.year-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.month-box {
    border: 1px solid var(--line-color);
    border-radius: 12px;
    padding: 10px;
    background: #fffdf7;
}

.month-title {
    font-family: var(--font-serif);
    text-align: center;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 1em;
}

.month-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    text-align: center;
}

.day-header {
    font-size: 0.75em;
    color: var(--ink-faint);
    padding: 3px;
    font-weight: 600;
}

.day-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-size: 0.8em;
    cursor: default;
    position: relative;
    min-height: 24px;
}

.day-cell.other-month {
    color: #c9c0ab;
}

.day-cell.checked {
    background: var(--primary-color);
    color: #fdf8ee;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(176, 58, 46, 0.3);
}

/* 同周连续签到日圆角衔接，形成连续功线 */
.day-cell.checked:has(+ .day-cell.checked) {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.day-cell.checked + .day-cell.checked {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.day-cell.today {
    border: 3px solid var(--primary-color);
    font-weight: 700;
}

.day-cell.checked.today {
    border-color: #74251c;
    box-shadow:
        inset 0 0 0 3px #fffdf7,
        0 2px 4px rgba(176, 58, 46, 0.35);
}

.day-cell.future {
    color: var(--ink-faint);
    opacity: 0.68;
}

.calendar-toggleable:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.legend {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--line-color);
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--font-size-sm);
    color: var(--ink-soft);
}

.legend-item.today-legend {
    color: var(--primary-color);
    font-weight: 700;
}

.legend-box {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.legend-box.checked {
    background: var(--primary-color);
}

.legend-box.today {
    border: 3px solid var(--primary-color);
    background: #fffdf7;
    box-shadow: 0 0 0 1px rgba(176, 58, 46, 0.18);
}

.close-btn {
    float: right;
    font-size: 28px;
    cursor: pointer;
    color: var(--ink-faint);
    line-height: 1;
    background: transparent;
    border: 0;
    padding: 0;
}

.close-btn:hover {
    color: var(--ink-color);
}

.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    left: 20px;
    background: #3a3630;
    color: #f6f1e7;
    padding: 12px 20px;
    border-radius: 8px;
    display: none;
    z-index: 2000;
    max-width: 100%;
    text-align: center;
    font-size: var(--font-size-sm);
}

.toast.show {
    display: block;
    animation: slideUp 0.3s;
}

@keyframes slideUp {
    from { transform: translateY(100px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.export-area {
    background: #f7f2e4;
    padding: var(--spacing-md);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    white-space: pre-wrap;
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--line-color);
    display: none;
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.month-detail-view {
    display: none;
}

.month-calendar {
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
}

.month-detail-view .day-cell {
    padding: 10px;
    text-align: center;
    border-radius: 8px;
}

.month-detail-view .day-cell:not(.checked) {
    background: var(--paper-tint);
}

.month-nav,
.year-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.month-nav button,
.year-nav button {
    background: var(--paper-tint);
    border: 1px solid var(--line-color);
    color: var(--ink-color);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-sm);
}

.month-nav button:hover,
.year-nav button:hover:not(:disabled) {
    background: #ece2c8;
    border-color: var(--line-strong);
}

.year-nav button:disabled {
    cursor: not-allowed;
    opacity: 0.42;
}

.current-month-display {
    font-family: var(--font-serif);
    font-size: 1.1em;
    font-weight: bold;
    color: var(--primary-color);
}

.edit-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(45, 42, 38, 0.55);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 10px;
}

.edit-modal-content {
    background: var(--paper-raised);
    border: 1px solid var(--line-strong);
    padding: var(--spacing-md);
    border-radius: 16px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalIn 0.25s ease;
}

.edit-modal-title {
    margin-bottom: var(--spacing-md);
    color: var(--ink-color);
}

.edit-field { margin-bottom: 15px; }
.edit-field-large { margin-bottom: var(--spacing-md); }
.edit-field label {
    display: block;
    margin-bottom: 5px;
}
.edit-field input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--line-color);
    border-radius: 8px;
    background: var(--paper-bright);
}
.edit-checkin-dates {
    max-height: 150px;
    overflow-y: auto;
    background: var(--paper-tint);
    padding: 10px;
    border-radius: 8px;
}

.empty-state {
    text-align: center;
    color: var(--ink-faint);
    padding: 40px;
}

.checkin-count { color: var(--primary-color); }
.checkin-date-empty { color: var(--ink-faint); }
.checkin-date-tag {
    display: inline-flex;
    align-items: center;
    background: var(--primary-color);
    color: var(--paper-raised);
    padding: 4px 12px;
    border-radius: 20px;
    margin: 4px;
    font-size: 0.9em;
}
.remove-checkin-date {
    margin-left: 8px;
    cursor: pointer;
    font-weight: bold;
}

.range-info {
    background: #f3e9d2;
    border-left: 4px solid #c9a227;
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    color: #7a5b12;
    font-size: var(--font-size-xs);
}

.detected-date {
    background: #f3dcd7;
    border: 1px solid #d9a296;
    color: var(--secondary-color);
    padding: 8px 12px;
    border-radius: 6px;
    margin-bottom: 10px;
    font-size: var(--font-size-xs);
    display: none;
}

.detected-date.show {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.paste-hint {
    font-size: var(--font-size-xs);
    color: var(--ink-soft);
    margin-bottom: 8px;
    background: #f7f0dc;
    padding: 8px;
    border-radius: 6px;
    border-left: 3px solid #c9a227;
}

.paste-hint strong {
    color: #7a5b12;
}

/* 操作按钮组 */
.action-buttons {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.action-buttons .btn {
    padding: 6px 10px;
    font-size: var(--font-size-xs);
}

/* “更多”操作菜单：收纳高风险操作（清空数据、删除等） */
.more-actions {
    position: relative;
    display: inline-block;
}

.more-menu {
    position: fixed;
    min-width: 120px;
    background: var(--paper-bright);
    border: 1px solid var(--line-color);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(69, 58, 36, 0.22);
    padding: 4px;
    z-index: 1200;
}

.more-menu-item {
    display: block;
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: none;
    border-radius: 6px;
    text-align: left;
    font-size: var(--font-size-sm);
    font-family: inherit;
    color: var(--ink-color);
    cursor: pointer;
}

.more-menu-item:hover,
.more-menu-item:focus-visible {
    background: var(--paper-tint);
    outline: none;
}

.more-menu-danger {
    color: var(--danger-color);
    font-weight: 600;
}

.more-menu-danger:hover,
.more-menu-danger:focus-visible {
    background: rgba(192, 57, 43, 0.1);
}

/* ==================== 响应式设计 ==================== */

/* 平板端：768px - 1024px */
@media (max-width: 1024px) {
    :root {
        --spacing-lg: 24px;
        --spacing-md: 16px;
        --font-size-xl: 1.8em;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .year-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .import-methods {
        grid-template-columns: 1fr;
    }

    .calendar-content {
        max-width: 95vw;
    }
}

/* 手机端：小于 768px */
@media (max-width: 768px) {
    :root {
        --border-radius: 12px;
        --spacing-xs: 6px;
        --spacing-sm: 10px;
        --spacing-md: 14px;
        --spacing-lg: 16px;
        --font-size-xs: 11px;
        --font-size-sm: 13px;
        --font-size-md: 14px;
        --font-size-lg: 1.1em;
        --font-size-xl: 1.5em;
    }

    body {
        padding: 10px;
    }

    .header {
        padding: 40px var(--spacing-md) var(--spacing-md);
    }

    .admin-entry-button {
        top: 10px;
        right: 12px;
    }

    .header h1 {
        font-size: var(--font-size-xl);
    }

    .header-title-row {
        gap: 10px;
    }

    .header p {
        font-size: var(--font-size-xs);
    }

    .content {
        padding: var(--spacing-sm);
    }

    .section {
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }

    .table-container.is-scrollable:not(.is-scrolled-to-end) {
        -webkit-mask-image: linear-gradient(to right, #000 calc(100% - 32px), transparent);
        mask-image: linear-gradient(to right, #000 calc(100% - 32px), transparent);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .stat-card {
        padding: var(--spacing-sm);
    }

    .stat-number {
        font-size: 1.5em;
    }

    .stat-label {
        font-size: var(--font-size-xs);
    }

    .form-group {
        gap: 8px;
    }

    .form-group input[type="text"],
    .form-group input[type="number"] {
        flex: 1;
        min-width: 60px;
    }

    .btn {
        padding: 8px 14px;
        font-size: var(--font-size-xs);
    }

    .report-actions .btn {
        min-height: 44px;
    }

    .admin-tabs {
        flex-wrap: nowrap;
        gap: 6px;
    }

    .admin-tab {
        flex: 1;
        padding: 10px 6px;
        font-size: 14px;
        letter-spacing: 0.05em;
        text-align: center;
        white-space: nowrap;
    }

    .date-selector {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .year-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .chart-container {
        height: 260px;
    }

    .month-box {
        padding: 8px;
    }

    .day-cell {
        font-size: 0.75em;
        min-height: 28px;
    }

    .calendar-content {
        padding: var(--spacing-sm);
        max-height: 95vh;
    }

    .calendar-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .calendar-title {
        font-size: 1.1em;
    }

    .calendar-heading {
        align-self: stretch;
    }

    .view-toggle {
        align-self: stretch;
        justify-content: center;
    }

    .view-btn {
        flex: 1;
        text-align: center;
    }

    .legend {
        gap: var(--spacing-sm);
    }

    .action-buttons {
        flex-wrap: nowrap;
    }

    .action-buttons .btn {
        padding: 5px 8px;
        margin: 0;
    }

    th, td {
        padding: 8px;
        font-size: var(--font-size-xs);
        white-space: nowrap;
    }

    .edit-modal-content {
        padding: var(--spacing-md);
    }

    .toast {
        left: 10px;
        right: 10px;
        bottom: 10px;
    }

    .export-area {
        max-height: 200px;
    }

    #localSaveStatus {
        font-size: 11px !important;
        padding: 8px !important;
    }
}

/* 超小屏幕：小于 480px */
@media (max-width: 480px) {
    :root {
        --font-size-xl: 1.3em;
        --font-size-lg: 1em;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
    }

    .stat-number {
        font-size: 1.3em;
    }

    .header h1 {
        font-size: 1.2em;
    }

    .header-seal {
        width: calc(1.2em * 1.6);
        height: calc(1.2em * 1.6);
    }

    .section-title {
        font-size: 1em;
    }

    .btn {
        padding: 6px 10px;
        font-size: 11px;
    }

    .form-group {
        flex-direction: column;
        width: 100%;
    }

    .form-group input,
    .form-group .btn {
        width: 100%;
    }

    .report-actions .btn {
        min-height: 48px;
        font-size: var(--font-size-sm);
    }
}

/* 横屏手机 */
@media (max-height: 500px) and (orientation: landscape) {
    .calendar-content {
        max-height: 95vh;
    }

    .year-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .month-box {
        padding: 6px;
    }
}

/* 大桌面屏幕 */
@media (min-width: 1400px) {
    :root {
        --font-size-xl: 2.2em;
        --font-size-lg: 1.4em;
    }

    .container {
        max-width: 1600px;
    }

    .year-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* 尊重系统减弱动效设置 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 回到顶部 */
.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 76px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1.5px solid var(--primary-color);
    background: var(--paper-raised);
    color: var(--primary-color);
    font-size: 19px;
    font-family: var(--font-serif);
    font-weight: 700;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.25s, transform 0.25s, visibility 0.25s, background-color 0.2s, color 0.2s;
    z-index: 900;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-color);
    color: #fdf8ee;
}

/* 打印样式 */
@media print {
    body {
        background: white;
        padding: 0;
    }

    .container {
        box-shadow: none;
    }

    .btn, .form-group, .section:first-of-type, .back-to-top, .local-save-status, .search-box, .admin-entry-button, .admin-logout-button {
        display: none !important;
    }

    .calendar-modal, .edit-modal {
        display: none !important;
    }
}