/* 邮件管理系统 - 全站样式 */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success-bg: #dcfce7;
    --success-fg: #166534;
    --danger-bg: #fee2e2;
    --danger-fg: #991b1b;
    --warning-bg: #fef3c7;
    --warning-fg: #92400e;
    --text: #333;
    --text-secondary: #666;
    --text-muted: #888;
    --border: #e5e7eb;
    --bg: #f5f6f8;
    --card: #fff;
    --topnav-bg: #1e293b;
    --topnav-text: #cbd5e1;
    --input-bg: #fff;
    --hover-bg: #f0f0f0;
    --row-hover: #f5f9ff;
    --row-active: #e8f0ff;
    --row-border: #f5f5f5;
    --head-bg: #fafbfc;
    --th-bg: #f8fafc;
    --radius-sm: 8px;
    --radius-md: 10px;
    --shadow: 0 1px 4px rgba(0, 0, 0, .06);
}

html[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --success-bg: #064e3b;
    --success-fg: #6ee7b7;
    --danger-bg: #7f1d1d;
    --danger-fg: #fca5a5;
    --warning-bg: #78350f;
    --warning-fg: #fcd34d;
    --text: #e5e7eb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border: #374151;
    --bg: #0f172a;
    --card: #1e293b;
    --topnav-bg: #020617;
    --topnav-text: #94a3b8;
    --input-bg: #0f172a;
    --hover-bg: #334155;
    --row-hover: #334155;
    --row-active: #1e40af;
    --row-border: #334155;
    --head-bg: #0f172a;
    --th-bg: #0f172a;
    --shadow: 0 1px 4px rgba(0, 0, 0, .3);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    font-size: 14px;
    line-height: 1.6;
    transition: background .2s, color .2s;
    -webkit-text-size-adjust: 100%;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: var(--head-bg); padding: 2px 6px; border-radius: 4px; font-size: 12px; font-family: "SF Mono", Consolas, monospace; color: var(--text); }
.container { max-width: 1000px; margin: 0 auto; }
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; flex-wrap: wrap; gap: 12px; }
.page-header h1 { font-size: 20px; margin: 0; font-weight: 600; }
.page-header .actions { display: flex; gap: 10px; align-items: center; font-size: 14px; }
.card { background: var(--card); border-radius: var(--radius-md); padding: 22px; box-shadow: var(--shadow); margin-bottom: 20px; }
.card h3 { margin: 0 0 18px; font-size: 16px; font-weight: 600; }
.btn { display: inline-block; padding: 9px 18px; border-radius: var(--radius-sm); border: none; font-size: 14px; font-family: inherit; cursor: pointer; text-decoration: none; text-align: center; transition: background .15s, color .15s; line-height: 1.4; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: var(--card); color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--hover-bg); }
.btn-block { width: 100%; }
.btn-sm { padding: 5px 11px; font-size: 13px; border-radius: 6px; border: none; cursor: pointer; text-decoration: none; display: inline-block; margin-right: 4px; transition: background .15s; }
.btn-sm:hover { text-decoration: none; }
.btn-test { background: #d1fae5; color: #065f46; }
.btn-edit { background: #e0e7ff; color: #3730a3; }
.btn-toggle { background: var(--warning-bg); color: var(--warning-fg); }
.btn-del { background: var(--danger-bg); color: var(--danger-fg); }
label { display: block; font-size: 13px; color: var(--text-secondary); margin: 16px 0 6px; font-weight: 500; }
label:first-of-type { margin-top: 0; }
input[type=text], input[type=password], input[type=search], select, textarea {
    width: 100%; padding: 11px 13px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); font-size: 14px; font-family: inherit;
    background: var(--input-bg); color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); }
input:disabled { background: var(--head-bg); color: var(--text-muted); cursor: not-allowed; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }
.checkbox-row { display: flex; align-items: center; gap: 8px; margin-top: 16px; font-size: 14px; }
.checkbox-row input[type=checkbox] { width: auto; margin: 0; }
.checkbox-row label { margin: 0; }
.form-tip { font-size: 12px; color: var(--text-muted); margin-top: 6px; line-height: 1.6; }
.form-tip.highlight { background: #fffbeb; color: var(--warning-fg); padding: 10px 12px; border-radius: 6px; border-left: 3px solid #f59e0b; margin-top: 10px; }
html[data-theme="dark"] .form-tip.highlight { background: #422006; }
.form-actions { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; }
.msg { font-size: 14px; padding: 12px 14px; border-radius: var(--radius-sm); margin-bottom: 18px; line-height: 1.6; word-break: break-word; }
.msg-ok { background: var(--success-bg); color: var(--success-fg); }
.msg-err { background: var(--danger-bg); color: var(--danger-fg); }
.msg-warn { background: var(--warning-bg); color: var(--warning-fg); }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 12px; text-align: left; font-size: 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table th { background: var(--th-bg); font-weight: 600; color: var(--text-secondary); font-size: 13px; white-space: nowrap; }
.table tr:last-child td { border-bottom: none; }
.table .actions-cell { white-space: nowrap; }
.badge { display: inline-block; padding: 3px 9px; border-radius: 10px; font-size: 12px; white-space: nowrap; }
.badge-on { background: #d1fae5; color: #065f46; }
.badge-off { background: #f3f4f6; color: #6b7280; }
.badge-mail { background: #e0e7ff; color: #3730a3; }
html[data-theme="dark"] .badge-on { background: #064e3b; color: #6ee7b7; }
html[data-theme="dark"] .badge-off { background: #334155; color: #cbd5e1; }
html[data-theme="dark"] .badge-mail { background: #1e40af; color: #bfdbfe; }
html[data-theme="dark"] .btn-test { background: #064e3b; color: #6ee7b7; }
html[data-theme="dark"] .btn-edit { background: #1e40af; color: #bfdbfe; }

/* ============ 双栏邮件界面 ============ */
.mail-app {
    display: grid;
    grid-template-columns: 360px minmax(0, 1fr);
    gap: 16px;
    height: calc(100vh - 160px);
    min-height: 500px;
}
.mail-sidebar {
    background: var(--card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}
.sidebar-toolbar { padding: 12px; border-bottom: 1px solid var(--border); }
.sidebar-search { display: flex; flex-wrap: wrap; gap: 6px; }
.sidebar-search select,
.sidebar-search input[type=text] { padding: 7px 10px; font-size: 13px; border-radius: 6px; }
.sidebar-search select { flex: 0 0 100%; }
.sidebar-search input[type=text] { flex: 1; min-width: 100px; }
.sidebar-search .btn { padding: 7px 14px; font-size: 13px; }

.sidebar-actions {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 12px; border-bottom: 1px solid var(--border);
    font-size: 13px; background: var(--head-bg);
}
.check-all-label { display: flex; align-items: center; gap: 5px; margin: 0; font-size: 13px; color: var(--text-secondary); cursor: pointer; }
.check-all-label input { margin: 0; }
.sidebar-count { color: var(--text-muted); font-size: 12px; margin-right: auto; }
.sidebar-actions .btn-sm { padding: 4px 9px; font-size: 12px; }

.mail-list-scroll { flex: 1; overflow-y: auto; overflow-x: hidden; -webkit-overflow-scrolling: touch; }
.mail-list-scroll::-webkit-scrollbar { width: 6px; }
.mail-list-scroll::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.mail-row {
    display: flex; gap: 8px; align-items: flex-start;
    padding: 10px 12px; border-bottom: 1px solid var(--row-border);
    cursor: pointer; transition: background .12s;
}
.mail-row:hover { background: var(--row-hover); }
.mail-row.active { background: var(--row-active); border-left: 3px solid var(--primary); padding-left: 9px; }
.mail-row input[type=checkbox] { margin-top: 4px; flex-shrink: 0; }
.mail-row-body { flex: 1; min-width: 0; }
.mail-row-head { display: flex; justify-content: space-between; gap: 8px; align-items: baseline; margin-bottom: 3px; }
.mail-row-subject { font-weight: 600; font-size: 13px; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.mail-row-date { font-size: 11px; color: var(--text-muted); white-space: nowrap; flex-shrink: 0; }
.mail-row-meta { display: flex; gap: 6px; align-items: center; font-size: 12px; color: var(--text-secondary); min-width: 0; }
.mail-row-from { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.mail-row .badge { font-size: 10px; padding: 2px 6px; }

.sidebar-pagination { display: flex; flex-wrap: wrap; gap: 4px; padding: 8px 10px; border-top: 1px solid var(--border); justify-content: center; }
.sidebar-pagination a { padding: 3px 8px; font-size: 12px; border-radius: 4px; border: 1px solid var(--border); background: var(--card); color: var(--text); }
.sidebar-pagination a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.mail-content {
    background: var(--card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    overflow-y: auto; overflow-x: hidden;
    padding: 0; display: flex; flex-direction: column;
    min-width: 0;
}
.mail-content::-webkit-scrollbar { width: 8px; }
.mail-content::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.mail-content-empty { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text-muted); font-size: 14px; gap: 10px; }
.mail-content-empty .empty-icon { font-size: 48px; opacity: .4; }

.mail-view-head {
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--card);
    position: relative;
}
.mail-view-subject { font-size: 18px; font-weight: 600; margin: 0 0 12px; word-break: break-word; line-height: 1.4; color: var(--text); padding-right: 100px; }
.mail-view-info { font-size: 13px; color: var(--text-secondary); line-height: 1.8; }
.mail-view-info strong { color: var(--text-secondary); font-weight: 500; }

.mail-view-body { padding: 0; min-width: 0; overflow-x: hidden; width: 100%; background: var(--card); }
.mail-view-body iframe { display: block; width: 100%; border: none; min-height: 100px; transition: height .15s; }

.empty { text-align: center; color: var(--text-muted); padding: 48px 20px; line-height: 1.8; }
.topnav {
    background: var(--topnav-bg); color: #fff;
    height: 56px; display: flex; align-items: center; gap: 24px;
    padding: 0 24px; margin: -20px -20px 16px;
    transition: background .2s;
    overflow-x: auto;
}
.topnav strong { font-size: 15px; white-space: nowrap; }
.topnav a { color: var(--topnav-text); font-size: 14px; text-decoration: none; white-space: nowrap; }
.topnav a:hover, .topnav a.active { color: #fff; text-decoration: none; }
.topnav .spacer { flex: 1; min-width: 8px; }

.theme-toggle {
    background: transparent;
    border: 1px solid var(--topnav-text);
    color: var(--topnav-text);
    padding: 5px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    transition: all .15s;
    flex-shrink: 0;
}
.theme-toggle:hover {
    background: rgba(255, 255, 255, .1);
    color: #fff;
    border-color: #fff;
}

.login-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.login-box { background: var(--card); padding: 36px 32px; border-radius: 12px; width: 100%; max-width: 340px; box-shadow: 0 4px 24px rgba(0, 0, 0, .08); }
.login-box h1 { font-size: 20px; margin: 0 0 24px; text-align: center; font-weight: 600; }
.login-box .btn { margin-top: 20px; }
.login-tip { color: var(--text-muted); font-size: 12px; text-align: center; margin-top: 16px; }
.text-muted { color: var(--text-muted); }
.text-small { font-size: 13px; }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.mb-0 { margin-bottom: 0; }
.mb-16 { margin-bottom: 16px; }
.mb-20 { margin-bottom: 20px; }
.word-break { word-break: break-all; }

/* ============ 邮件列表增强 ============ */

.mail-row.unread .mail-row-subject { font-weight: 700; }
.mail-row.unread { background: rgba(37, 99, 235, .04); }
html[data-theme="dark"] .mail-row.unread { background: rgba(59, 130, 246, .08); }

.icon-star { color: #f59e0b; margin-right: 3px; }
.icon-attach { font-size: 12px; opacity: .7; }

.filter-tabs {
    display: flex;
    gap: 4px;
    margin-top: 10px;
}
.filter-tabs a {
    flex: 1;
    text-align: center;
    padding: 6px 0;
    font-size: 13px;
    border-radius: 6px;
    background: var(--head-bg);
    color: var(--text-secondary);
    text-decoration: none;
    transition: background .15s;
}
.filter-tabs a:hover { background: var(--hover-bg); text-decoration: none; }
.filter-tabs a.active { background: var(--primary); color: #fff; }

.mail-view-actions {
    position: absolute;
    top: 20px;
    right: 24px;
    display: flex;
    gap: 6px;
}
.mail-action-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 16px;
    cursor: pointer;
    color: var(--text);
    transition: background .15s;
    line-height: 1.2;
}
.mail-action-btn:hover { background: var(--hover-bg); }

/* 附件区 */
.mail-attachments {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}
.attach-title {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-weight: 500;
}
.attach-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.attach-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card);
    color: var(--text);
    text-decoration: none;
    font-size: 13px;
    transition: all .15s;
    max-width: 100%;
}
.attach-item:hover {
    background: var(--hover-bg);
    text-decoration: none;
    border-color: var(--primary);
}
.attach-icon { font-size: 16px; }
.attach-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 240px;
}
.attach-size { color: var(--text-muted); font-size: 12px; }

/* 手机端返回按钮（桌面隐藏） */
.mobile-back-btn { display: none; }

/* ============ 手机端：抽屉式切换 ============ */
@media (max-width: 768px) {
    body { padding: 12px; }
    .topnav {
        gap: 14px;
        padding: 0 14px;
        font-size: 13px;
        height: 50px;
        margin: -12px -12px 12px;
    }
    .topnav strong { font-size: 14px; }
    .topnav a { font-size: 13px; }
    .page-header h1 { font-size: 17px; }
    .page-header .actions { font-size: 13px; }

    /* 双栏改成单栏，两个视图互斥 */
    .mail-app {
        grid-template-columns: 1fr;
        height: calc(100vh - 120px);
        min-height: 400px;
        position: relative;
    }

    /* 默认显示列表 */
    .mail-sidebar {
        max-height: none;
        height: 100%;
    }

    /* 默认隐藏详情 */
    .mail-content {
        display: none;
        min-height: 0;
        height: 100%;
    }

    /* body 有 .mobile-reading 时，切到详情视图 */
    body.mobile-reading .mail-sidebar { display: none; }
    body.mobile-reading .mail-content { display: flex; }

    /* 手机端返回按钮 */
    .mobile-back-btn {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        background: transparent;
        border: none;
        color: var(--primary);
        font-size: 14px;
        cursor: pointer;
        padding: 0;
        margin-bottom: 8px;
        font-weight: 500;
    }
    .mobile-back-btn:hover { text-decoration: underline; }

    /* 详情页内边距紧凑 */
    .mail-view-head { padding: 14px 16px 12px; }
    .mail-view-subject {
        font-size: 16px;
        padding-right: 70px;
    }
    .mail-view-actions {
        top: 12px;
        right: 12px;
    }
    .mail-action-btn {
        padding: 3px 8px;
        font-size: 14px;
    }

    /* 列表行触控区域大一点 */
    .mail-row { padding: 12px 14px; }
    .mail-row-subject { font-size: 14px; }

    /* 附件按钮更大 */
    .attach-item { padding: 10px 14px; font-size: 13px; }
    .attach-name { max-width: 180px; }

    /* 侧栏操作栏紧凑 */
    .sidebar-actions { padding: 8px 10px; font-size: 12px; }
    .sidebar-actions .btn-sm { padding: 5px 10px; font-size: 12px; }

    /* 卡片紧凑 */
    .card { padding: 16px; }
    .card h3 { font-size: 15px; margin-bottom: 14px; }
    .table { font-size: 13px; }
    .table th, .table td { padding: 10px 8px; font-size: 13px; }

    /* 表单按钮全宽 */
    .form-actions .btn { flex: 1; min-width: 120px; }

    /* 底部工具栏固定 */
    .toolbar { position: sticky; bottom: 0; background: var(--bg); padding: 8px 0; z-index: 5; }
}

/* 超小屏优化 */
@media (max-width: 400px) {
    body { padding: 8px; }
    .topnav {
        gap: 10px;
        padding: 0 10px;
        margin: -8px -8px 10px;
        height: 46px;
    }
    .topnav strong { font-size: 13px; }
    .topnav a { font-size: 12px; }
    .theme-toggle { padding: 4px 8px; font-size: 13px; }
    .page-header h1 { font-size: 16px; }
    .mail-row { padding: 10px 12px; }
    .mail-row-subject { font-size: 13px; }
    .mail-view-subject { font-size: 15px; }
}
/* ============ 设置网格 ============ */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 18px;
}
@media (max-width: 640px) {
    .settings-grid { grid-template-columns: 1fr; }
}
.settings-item {
    background: var(--head-bg);
    border-radius: 8px;
    padding: 14px 16px;
    border: 1px solid var(--border);
}
.settings-item label {
    margin-top: 0;
    font-weight: 600;
    color: var(--text);
}
.settings-item .btn { padding: 7px 16px; font-size: 13px; }

.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}
@media (max-width: 560px) {
    .stats-row { grid-template-columns: repeat(2, 1fr); }
}
.stat-item {
    text-align: center;
    padding: 10px;
    background: var(--head-bg);
    border-radius: 8px;
}
.stat-num {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.2;
}
.stat-lbl {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}