/* ============================================
   0HMail · 邮箱 · Outlook 风格三栏布局
   配色: 深蓝 + 亮蓝
   ============================================ */

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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-hover: #dbeafe;
    --accent: #1e293b;
    --bg: #f1f5f9;
    --bg-secondary: #f8fafc;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius: 10px;
    --radius-sm: 6px;
    --radius-xs: 4px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: 0.15s ease;
    --nav-width: 200px;
    --header-height: 52px;
    --footer-height: 40px;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --card-bg: #1e293b;
    --card-border: #334155;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --border-light: #1e293b;
    --primary-light: #1e293b;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--card-border);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Toast ===== */
#toastContainer {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 380px;
    width: 100%;
    pointer-events: none;
}

.toast {
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    transform: translateX(calc(100% + 24px));
    opacity: 0;
    transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 10px;
    border-left: 4px solid transparent;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}
.toast.hide {
    transform: translateX(calc(100% + 24px));
    opacity: 0;
}

.toast .icon {
    font-size: 18px;
    flex-shrink: 0;
}
.toast .msg {
    flex: 1;
}
.toast .close-btn {
    background: none;
    border: none;
    color: inherit;
    opacity: 0.5;
    cursor: pointer;
    font-size: 18px;
    padding: 0 4px;
}
.toast .close-btn:hover {
    opacity: 1;
}

.toast-success {
    background: #ecfdf5;
    color: #065f46;
    border-left-color: #22c55e;
}
.toast-error {
    background: #fef2f2;
    color: #991b1b;
    border-left-color: #ef4444;
}
.toast-info {
    background: var(--primary-light);
    color: var(--primary-dark);
    border-left-color: var(--primary);
}
.toast-loading {
    background: var(--card-bg);
    color: var(--text-secondary);
    border-left-color: var(--border);
}
.toast-warning {
    background: #fffbeb;
    color: #92400e;
    border-left-color: #f59e0b;
}

[data-theme="dark"] .toast-success {
    background: #052e16;
    color: #6ee7b7;
}
[data-theme="dark"] .toast-error {
    background: #2d0a0a;
    color: #fca5a5;
}
[data-theme="dark"] .toast-info {
    background: #1e293b;
    color: #93c5fd;
}
[data-theme="dark"] .toast-warning {
    background: #2d1a0a;
    color: #fcd34d;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
    white-space: nowrap;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}
.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1.5px solid var(--border);
}
.btn-outline:hover {
    background: var(--bg-secondary);
    color: var(--text);
    border-color: var(--text-muted);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover {
    background: var(--bg-secondary);
    color: var(--text);
}

.btn-sm {
    padding: 4px 12px;
    font-size: 12px;
}
.btn-block {
    width: 100%;
    justify-content: center;
}
.btn-danger {
    background: #ef4444;
    color: white;
}
.btn-danger:hover {
    background: #dc2626;
}

/* ===== 应用容器 ===== */
.app-wrapper {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-height: 100vh;
    overflow: hidden;
    background: var(--bg);
}

/* ===== 头部 ===== */
.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0 20px;
    height: var(--header-height);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    transition: background var(--transition), border-color var(--transition);
}

.header-inner {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

[data-theme="dark"] .logo {
    color: var(--text);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-btn {
    width: 34px;
    height: 34px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.header-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    flex-shrink: 0;
    transition: opacity var(--transition);
}

.header-avatar:hover {
    opacity: 0.85;
}

/* ===== 主体 ===== */
.app-body {
    display: flex;
    flex: 1;
    overflow: hidden;
    background: var(--bg);
}

/* ===== 左侧导航 ===== */
.app-nav {
    width: var(--nav-width);
    flex-shrink: 0;
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 12px 0;
    overflow-y: auto;
    transition: background var(--transition), border-color var(--transition);
}

.nav-compose {
    padding: 0 12px 12px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.nav-compose .btn {
    font-size: 13px;
    padding: 8px 12px;
}

.nav-list {
    list-style: none;
    padding: 8px 8px;
    flex: 1;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-secondary);
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
}

.nav-item:hover {
    background: var(--bg-secondary);
    color: var(--text);
}

.nav-item.active {
    background: var(--primary-light);
    color: var(--primary);
}

.nav-item .nav-icon {
    width: 20px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-item .nav-label {
    flex: 1;
}

.nav-item .nav-badge {
    background: var(--bg-secondary);
    color: var(--text-muted);
    font-size: 11px;
    padding: 0 8px;
    border-radius: 10px;
    font-weight: 500;
}

.nav-item.active .nav-badge {
    background: var(--primary-light);
    color: var(--primary);
}

.nav-item.nav-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.nav-item.nav-disabled:hover {
    background: transparent;
    color: var(--text-secondary);
}

/* 导航底部用户 */
.nav-user {
    padding: 8px 12px;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.nav-user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 4px 0;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.nav-user-info:hover {
    background: var(--bg-secondary);
}

.nav-user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.nav-user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.nav-user-email {
    font-size: 11px;
    color: var(--text-muted);
}

/* ===== 中间：邮件列表 ===== */
.app-mail-list {
    flex: 1;
    min-width: 280px;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    transition: background var(--transition), border-color var(--transition);
}

.mail-list-toolbar {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    gap: 8px;
}

.mail-list-title {
    font-size: 15px;
    font-weight: 600;
}

.mail-list-count {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: auto;
}

.mail-list-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 0;
}

/* 邮件项 */
.mail-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-light);
    cursor: pointer;
    transition: background var(--transition);
    background: var(--card-bg);
}

.mail-item:hover {
    background: var(--bg-secondary);
}

.mail-item.unread {
    background: var(--primary-light);
}

.mail-item.unread:hover {
    background: var(--primary-hover);
}

.mail-item .avatar-small {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    color: white;
}

.mail-item .info {
    flex: 1;
    min-width: 0;
}

.mail-item .info .from {
    font-weight: 600;
    font-size: 13px;
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.mail-item .info .from .time {
    font-weight: 400;
    font-size: 11px;
    color: var(--text-muted);
}

.mail-item .info .subject {
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mail-item .info .subject .unread-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
    margin-right: 6px;
    flex-shrink: 0;
}

.mail-item.unread .info .subject {
    color: var(--text);
    font-weight: 500;
}

.mail-item .info .snippet {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mail-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
    text-align: center;
    height: 100%;
}

.mail-empty-state svg {
    margin-bottom: 12px;
    opacity: 0.4;
}

/* ===== 右侧：邮件内容 ===== */
.app-mail-content {
    flex: 2;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    transition: background var(--transition);
}

.mail-content-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    padding: 40px;
    text-align: center;
    flex: 1;
}

.mail-content-empty svg {
    margin-bottom: 12px;
    opacity: 0.4;
}

.mail-content-empty h3 {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 4px;
}

.mail-content-empty p {
    font-size: 14px;
}

/* 邮件阅读 */
.mail-read {
    display: none;
    flex-direction: column;
    height: 100%;
    padding: 20px 24px;
    flex: 1;
}

.mail-read-header {
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.mail-read-header .subject {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.mail-read-header .meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--text-secondary);
    flex-wrap: wrap;
}

.mail-read-header .meta .from-name {
    font-weight: 600;
    color: var(--text);
}

.mail-read-header .meta .dot {
    color: var(--text-muted);
}

.mail-read-header #readStatus {
    margin-left: auto;
    font-size: 12px;
    color: var(--text-muted);
}

.mail-read-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px 0 20px;
    font-size: 15px;
    line-height: 1.8;
    color: var(--text);
    white-space: pre-wrap;
    word-break: break-word;
}

.mail-read-body img {
    max-width: 100%;
}

.mail-read-footer {
    padding-top: 12px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

/* ===== 邮件编辑器 ===== */
.mail-compose {
    display: none;
    flex-direction: column;
    height: 100%;
    padding: 20px 24px;
    background: var(--card-bg);
    flex: 1;
}

.mail-compose-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
    flex-shrink: 0;
}

.mail-compose-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
}

.compose-field {
    margin-bottom: 14px;
}

.compose-field label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 3px;
}

.compose-field input,
.compose-field textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    transition: all var(--transition);
    box-sizing: border-box;
}

.compose-field input:focus,
.compose-field textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.compose-body-field {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.compose-body-field label {
    flex-shrink: 0;
}

.compose-body-field textarea {
    resize: none;
    flex: 1;
    min-height: 200px;
}

.compose-actions {
    display: flex;
    gap: 8px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

/* ===== iOS 风格开关 ===== */
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
    gap: 16px;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.toggle-label svg {
    flex-shrink: 0;
    color: var(--text-secondary);
}

.toggle-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
}

.toggle-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 1px;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 28px;
    flex-shrink: 0;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: #cbd5e1;
    border-radius: 30px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--primary);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.toggle-switch input:focus + .toggle-slider {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

[data-theme="dark"] .toggle-slider {
    background: #475569;
}

[data-theme="dark"] .toggle-switch input:checked + .toggle-slider {
    background: var(--primary);
}

/* ===== 模态框 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(6px);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--card-bg);
    border-radius: var(--radius);
    max-width: 480px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 32px 28px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--card-border);
    animation: modalIn 0.25s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.94) translateY(12px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal .modal-close {
    float: right;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0 4px;
    transition: color var(--transition);
    line-height: 1;
}

.modal .modal-close:hover {
    color: var(--text);
}

.modal h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}

.modal .subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.modal .form-group {
    margin-bottom: 14px;
}

.modal .form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.modal .form-group input,
.modal .form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    transition: all var(--transition);
    box-sizing: border-box;
}

.modal .form-group input:focus,
.modal .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.modal .form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.modal .form-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 4px;
}

.modal .form-actions .btn {
    justify-content: center;
}

.modal .form-footer {
    text-align: center;
    margin-top: 14px;
    font-size: 14px;
    color: var(--text-secondary);
}

.modal .form-footer a {
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
}

.modal .form-footer a:hover {
    text-decoration: underline;
}

/* ===== 设置页面 ===== */
.settings-page {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: var(--bg);
    flex-direction: column;
}

.settings-page.active {
    display: flex;
}

.settings-back {
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--card-bg);
    flex-shrink: 0;
}

.settings-back .btn {
    font-size: 13px;
}

.settings-body {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.settings-nav {
    width: 200px;
    flex-shrink: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 16px 0;
    overflow-y: auto;
}

.settings-nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 18px;
    color: var(--text-secondary);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-size: 14px;
    font-family: var(--font);
    transition: all var(--transition);
    border-left: 2px solid transparent;
}

.settings-nav-item:hover {
    background: var(--border-light);
    color: var(--text);
}

.settings-nav-item.active {
    background: var(--primary-light);
    color: var(--primary);
    border-left-color: var(--primary);
}

.settings-content {
    flex: 1;
    padding: 28px 32px;
    overflow-y: auto;
}

.settings-content .section-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
}

.settings-content .section-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.settings-content .setting-group {
    margin-bottom: 20px;
}

.settings-content .setting-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.settings-content .setting-group .hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.settings-content .setting-group input,
.settings-content .setting-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    transition: all var(--transition);
    box-sizing: border-box;
}

.settings-content .setting-group input:focus,
.settings-content .setting-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.settings-content .setting-group textarea {
    resize: vertical;
    min-height: 80px;
}

.settings-content .divider {
    height: 1px;
    background: var(--border);
    margin: 24px 0;
}

.settings-content .danger-zone {
    border: 1px solid #fecaca;
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    background: #fef2f2;
}

[data-theme="dark"] .settings-content .danger-zone {
    background: #2d0a0a;
    border-color: #7f1d1d;
}

.settings-content .danger-zone h4 {
    color: #dc2626;
    margin-bottom: 8px;
}

.settings-content .danger-zone p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 8px 16px;
    color: var(--text-muted);
    font-size: 12px;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    background: var(--card-bg);
}

/* ===== 加载骨架 ===== */
.mail-skeleton {
    animation: shimmer 1.2s ease-in-out infinite;
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-light) 50%, var(--bg-secondary) 75%);
    background-size: 200px 100%;
    border-radius: var(--radius-xs);
    min-height: 16px;
}

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

.mail-skeleton-item {
    display: flex;
    gap: 12px;
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-light);
}

.mail-skeleton-item .avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.mail-skeleton-item .lines {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.mail-skeleton-item .lines .line1 {
    width: 60%;
    height: 14px;
    background: var(--bg-secondary);
    border-radius: 4px;
}

.mail-skeleton-item .lines .line2 {
    width: 80%;
    height: 12px;
    background: var(--bg-secondary);
    border-radius: 4px;
}

.mail-skeleton-item .lines .line3 {
    width: 40%;
    height: 12px;
    background: var(--bg-secondary);
    border-radius: 4px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .app-mail-list {
        max-width: 340px;
        min-width: 240px;
    }
    .app-mail-content {
        min-width: 240px;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-width: 56px;
    }

    .app-mail-list {
        max-width: none;
        min-width: 0;
        flex: 1;
    }

    .app-mail-content {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 500;
        background: var(--card-bg);
    }

    .app-mail-content.mobile-open {
        display: flex;
    }

    .nav-label,
    .nav-badge,
    .nav-user-name,
    .nav-user-email,
    .nav-compose .btn span {
        display: none;
    }

    .nav-compose .btn {
        justify-content: center;
        padding: 8px;
    }

    .nav-item {
        justify-content: center;
        padding: 10px;
    }

    .nav-user {
        padding: 8px;
    }

    .nav-user-info {
        justify-content: center;
    }

    .app-nav {
        width: var(--nav-width);
    }

    .mail-list-title {
        font-size: 14px;
    }

    .mail-read {
        padding: 14px 16px;
    }

    .mail-read-header .subject {
        font-size: 17px;
    }

    .mail-compose {
        padding: 14px 16px;
    }
    .compose-body-field textarea {
        min-height: 140px;
    }

    .settings-body {
        flex-direction: column;
    }
    .settings-nav {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        display: flex;
        overflow-x: auto;
        padding: 8px 12px;
        gap: 4px;
    }
    .settings-nav-item {
        padding: 8px 14px;
        white-space: nowrap;
        border-left: none;
        border-bottom: 2px solid transparent;
        width: auto;
    }
    .settings-nav-item.active {
        border-bottom-color: var(--primary);
        border-left-color: transparent;
    }
    .settings-content {
        padding: 20px 16px;
    }
}

@media (max-width: 480px) {
    .app-mail-list {
        flex: 1;
    }
    .mail-item {
        padding: 8px 12px;
    }
    .mail-item .info .from {
        font-size: 12px;
    }
    .mail-item .info .subject {
        font-size: 12px;
    }
    .mail-list-toolbar {
        padding: 8px 12px;
    }
    .mail-read {
        padding: 12px 14px;
    }
    .mail-compose {
        padding: 12px 14px;
    }
    .compose-body-field textarea {
        min-height: 100px;
    }
    .modal {
        padding: 20px 16px;
        margin: 10px;
    }
    .settings-content {
        padding: 16px 12px;
    }
}

/* 移动端返回按钮（JS 控制） */
.mobile-back-btn {
    display: none;
}

@media (max-width: 768px) {
    .mobile-back-btn {
        display: inline-flex;
    }
}
/* ============================================
   修复：设置页面样式
   ============================================ */

/* 设置页面 - 覆盖之前的样式 */
.settings-page {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: var(--bg);
    flex-direction: column;
    overflow: hidden;
}

.settings-page.active {
    display: flex;
}

/* 设置页面头部 */
.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    min-height: 56px;
}

.settings-header .settings-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
}

.settings-header .btn {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 6px 12px;
}

.settings-header .btn:hover {
    color: var(--text);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.settings-header .btn svg {
    flex-shrink: 0;
}

/* 设置页面主体 */
.settings-body {
    display: flex;
    flex: 1;
    overflow: hidden;
    background: var(--bg);
}

/* 设置导航 */
.settings-nav {
    width: 220px;
    flex-shrink: 0;
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    padding: 16px 0;
    overflow-y: auto;
}

.settings-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    color: var(--text-secondary);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-size: 14px;
    font-family: var(--font);
    transition: all var(--transition);
    border-left: 3px solid transparent;
    font-weight: 500;
}

.settings-nav-item:hover {
    background: var(--bg-secondary);
    color: var(--text);
}

.settings-nav-item.active {
    background: var(--primary-light);
    color: var(--primary);
    border-left-color: var(--primary);
}

.settings-nav-item svg {
    flex-shrink: 0;
}

/* 设置内容 */
.settings-content {
    flex: 1;
    padding: 32px 40px;
    overflow-y: auto;
    background: var(--bg);
}

.settings-content .section-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.settings-content .section-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 28px;
}

.settings-content .setting-group {
    margin-bottom: 22px;
    max-width: 480px;
}

.settings-content .setting-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.settings-content .setting-group .hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.settings-content .setting-group input,
.settings-content .setting-group textarea,
.settings-content .setting-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font);
    background: var(--card-bg);
    color: var(--text);
    transition: all var(--transition);
    box-sizing: border-box;
}

.settings-content .setting-group input:focus,
.settings-content .setting-group textarea:focus,
.settings-content .setting-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.settings-content .setting-group textarea {
    resize: vertical;
    min-height: 80px;
}

.settings-content .divider {
    height: 1px;
    background: var(--border);
    margin: 28px 0;
    max-width: 480px;
}

.settings-content .danger-zone {
    border: 1px solid #fecaca;
    border-radius: var(--radius-sm);
    padding: 18px 22px;
    background: #fef2f2;
    max-width: 480px;
}

[data-theme="dark"] .settings-content .danger-zone {
    background: #2d0a0a;
    border-color: #7f1d1d;
}

.settings-content .danger-zone h4 {
    color: #dc2626;
    font-size: 15px;
    margin-bottom: 6px;
}

.settings-content .danger-zone p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* 设置面板切换 */
.settings-panel {
    display: block;
}

.settings-panel[style*="display:none"] {
    display: none !important;
}

/* ===== 设置页面响应式 ===== */
@media (max-width: 768px) {
    .settings-header {
        padding: 10px 16px;
        min-height: 48px;
    }
    
    .settings-header .settings-title {
        font-size: 16px;
    }

    .settings-body {
        flex-direction: column;
    }

    .settings-nav {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        display: flex;
        overflow-x: auto;
        padding: 8px 12px;
        gap: 4px;
        flex-shrink: 0;
    }

    .settings-nav-item {
        padding: 8px 14px;
        white-space: nowrap;
        border-left: none;
        border-bottom: 2px solid transparent;
        width: auto;
        font-size: 13px;
        gap: 6px;
    }

    .settings-nav-item.active {
        border-bottom-color: var(--primary);
        border-left-color: transparent;
    }

    .settings-nav-item svg {
        width: 16px;
        height: 16px;
    }

    .settings-content {
        padding: 20px 16px;
    }

    .settings-content .section-title {
        font-size: 19px;
    }

    .settings-content .setting-group {
        max-width: 100%;
    }

    .settings-content .danger-zone {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .settings-header {
        padding: 8px 12px;
    }

    .settings-header .settings-title {
        font-size: 15px;
    }

    .settings-content {
        padding: 16px 12px;
    }

    .settings-content .section-title {
        font-size: 17px;
    }

    .settings-nav-item {
        font-size: 12px;
        padding: 6px 10px;
    }
}