/* ============ 设计系统 ============ */
:root {
    /* 深色调色板 */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-elevated: #22222f;
    --bg-hover: #2a2a3a;

    /* 边框 */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: rgba(255, 255, 255, 0.1);
    --border-active: rgba(59, 130, 246, 0.5);

    /* 文字 */
    --text-primary: #e8e8ed;
    --text-secondary: #8b8b9e;
    --text-tertiary: #5c5c72;
    --text-accent: #60a5fa;

    /* 强调色 */
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.15);

    /* 状态色 */
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);

    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

/* ============ 全局重置 ============ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-default);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* ============ 应用容器 ============ */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ============ 顶部导航 ============ */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    padding: 0 var(--space-xl);
    height: 56px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    position: relative;
    z-index: 10;
}

.header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0.3;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header h1 {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.header h1 span {
    color: var(--accent);
}

.subtitle {
    font-size: 11px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* ============ 按钮系统 ============ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 12px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
    user-select: none;
}

.btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-active);
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: white;
    box-shadow: 0 0 20px var(--accent-glow);
}

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

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

.btn-danger {
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: var(--danger-bg);
    border-color: var(--danger);
    color: var(--danger);
}

.btn-sm {
    padding: 4px 10px;
    font-size: 11px;
}

.btn-icon {
    padding: 6px;
    min-width: 32px;
    justify-content: center;
}

.btn-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 18px;
    padding: 4px;
    line-height: 1;
    transition: color 0.15s;
}

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

/* ============ 主内容区 ============ */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    gap: 1px;
    background: var(--border-subtle);
}

/* ============ 左侧边栏 ============ */
.sidebar {
    width: 200px;
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
}

.sidebar-header h2 {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-family: var(--font-mono);
}

.group-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
}

.group-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
    margin-bottom: 2px;
    gap: var(--space-sm);
    border: 1px solid transparent;
}

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

.group-item.active {
    background: var(--accent-glow);
    border-color: var(--border-active);
}

.group-item .group-icon {
    font-size: 14px;
    opacity: 0.7;
}

.group-item .group-name {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.group-item .group-count {
    font-size: 10px;
    color: var(--text-tertiary);
    background: var(--bg-primary);
    padding: 1px 6px;
    border-radius: 10px;
    font-family: var(--font-mono);
}

.group-item .group-delete {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 12px;
    padding: 2px 4px;
    border-radius: var(--radius-sm);
    opacity: 0;
    transition: all 0.15s;
}

.group-item:hover .group-delete {
    opacity: 1;
}

.group-item .group-delete:hover {
    color: var(--danger);
    background: var(--danger-bg);
}

.sidebar-footer {
    padding: var(--space-md);
    border-top: 1px solid var(--border-subtle);
}

/* ============ 面板通用 ============ */
.panel {
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.panel-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.search-bar {
    width: 100%;
}

.search-input {
    width: 100%;
    padding: 6px 10px;
    background: var(--bg-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 12px;
    transition: border-color 0.15s;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.panel-title {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
}

.panel-title h2 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.account-count {
    font-size: 10px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

.toolbar {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    align-items: center;
}

/* ============ 账号列表 ============ */
.account-panel {
    width: 320px;
    background: var(--bg-secondary);
}

.account-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
}

.account-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
    gap: var(--space-md);
    margin-bottom: 2px;
    border: 1px solid transparent;
}

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

.account-item.active {
    background: var(--accent-glow);
    border-color: var(--border-active);
}

.account-item input[type="checkbox"] {
    width: 14px;
    height: 14px;
    cursor: pointer;
    accent-color: var(--accent);
    flex-shrink: 0;
}

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

.account-email-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.account-email {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: var(--font-mono);
    flex: 1;
    min-width: 0;
}

.btn-action {
    background: var(--bg-hover);
    border: 1px solid var(--border-default);
    cursor: pointer;
    font-size: 12px;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    opacity: 0;
    transition: all 0.15s;
    flex-shrink: 0;
    line-height: 1;
    color: var(--text-secondary);
}

.account-item:hover .btn-action {
    opacity: 1;
}

.btn-action:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.btn-action-danger {
    color: var(--danger);
}

.btn-action-danger:hover {
    background: var(--danger);
    border-color: var(--danger);
    color: white;
}

.account-status {
    font-size: 9px;
    padding: 1px 6px;
    border-radius: 10px;
    display: inline-block;
    margin-top: 4px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-valid {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.status-invalid {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.status-unknown {
    background: var(--bg-hover);
    color: var(--text-tertiary);
    border: 1px solid var(--border-default);
}

/* ============ 邮件区域 ============ */
.email-panel {
    flex: 1;
    min-width: 0;
    background: var(--bg-primary);
}

.email-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.email-list-view,
.email-detail-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.email-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
}

.email-item {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
    margin-bottom: 2px;
    border: 1px solid transparent;
    position: relative;
}

.email-item:hover {
    background: var(--bg-hover);
    border-color: var(--border-subtle);
}

.email-item.unread {
    background: var(--bg-secondary);
    border-color: var(--border-default);
}

.email-item.unread::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--accent);
    border-radius: 0 2px 2px 0;
}

.email-subject {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.email-from {
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.email-preview {
    font-size: 11px;
    color: var(--text-tertiary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.email-time {
    font-size: 10px;
    color: var(--text-tertiary);
    margin-top: 4px;
    font-family: var(--font-mono);
}

/* ============ 邮件详情 ============ */
.email-detail {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-xl);
}

.email-detail-header {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
}

.email-detail-subject {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.email-detail-meta {
    font-size: 12px;
    color: var(--text-secondary);
}

.email-detail-meta p {
    margin-bottom: 6px;
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
}

.email-detail-meta strong {
    color: var(--text-tertiary);
    font-weight: 500;
    min-width: 50px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.email-detail-body {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-primary);
}

.email-detail-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

/* ============ 弹窗系统 ============ */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 100;
    justify-content: center;
    align-items: center;
}

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

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    width: 500px;
    max-width: 90vw;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    animation: modalSlideIn 0.2s ease;
}

.modal-sm {
    width: 380px;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-xl);
    flex: 1;
    overflow-y: auto;
}

.modal-footer {
    padding: var(--space-md) var(--space-xl);
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
}

/* ============ 表单控件 ============ */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-size: 11px;
    font-weight: 500;
    color: var(--text-tertiary);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group textarea,
.form-group input[type="text"] {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 12px;
    font-family: var(--font-mono);
    resize: vertical;
    line-height: 1.6;
    transition: border-color 0.15s;
}

.form-group textarea:focus,
.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea::placeholder,
.form-group input[type="text"]::placeholder {
    color: var(--text-tertiary);
}

.form-select {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 12px;
    cursor: pointer;
    transition: border-color 0.15s;
}

.form-select:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group input[type="file"] {
    width: 100%;
    padding: var(--space-md);
    background: var(--bg-primary);
    border: 1px dashed var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 12px;
}

.form-group input[type="file"]:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.move-count {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.move-count strong {
    color: var(--accent);
    font-family: var(--font-mono);
}

/* ============ 空状态 ============ */
.empty-state {
    text-align: center;
    color: var(--text-tertiary);
    padding: 60px var(--space-xl);
    font-size: 13px;
}

.empty-state::before {
    content: '📭';
    display: block;
    font-size: 32px;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

/* ============ 提示框 ============ */
.toast {
    position: fixed;
    top: var(--space-xl);
    right: var(--space-xl);
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-size: 12px;
    z-index: 200;
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.2s ease;
    pointer-events: none;
    max-width: 360px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast.success {
    border-color: rgba(34, 197, 94, 0.3);
    background: linear-gradient(135deg, var(--bg-elevated), rgba(34, 197, 94, 0.1));
}

.toast.error {
    border-color: rgba(239, 68, 68, 0.3);
    background: linear-gradient(135deg, var(--bg-elevated), rgba(239, 68, 68, 0.1));
}

.toast.info {
    border-color: rgba(59, 130, 246, 0.3);
    background: linear-gradient(135deg, var(--bg-elevated), rgba(59, 130, 246, 0.1));
}

/* ============ 加载动画 ============ */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-tertiary);
    font-size: 12px;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-default);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: var(--space-sm);
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============ 响应式 ============ */
@media (max-width: 900px) {
    .sidebar {
        width: 160px;
    }
    .account-panel {
        width: 260px;
    }
}

@media (max-width: 700px) {
    .main-content {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        max-height: 120px;
    }
    .group-list {
        display: flex;
        gap: var(--space-sm);
        overflow-x: auto;
        padding: var(--space-sm);
    }
    .group-item {
        flex-shrink: 0;
    }
    .account-panel {
        width: 100%;
        max-height: 35vh;
    }
}