/* 小N学术站 - 全局样式 */
/* Nature Classic 配色 + Times New Roman/宋体 字体 */

:root {
    /* 小N学术站配色 - 蓝绿主调 */
    --primary: #4DBBD5;        /* 主基调 - 蓝色（按钮、标题、强调） */
    --primary-light: #6DCCE8;
    --secondary: #00A087;       /* 主基调 - 绿色（成功状态、卡片边框） */
    --secondary-light: #00C49A;
    
    /* 文字颜色 */
    --text: #3C5488;           /* 主要文字（正文） */
    --text-secondary: #8491B4;  /* 次要信息（作者、出版日期等） */
    --text-muted: #AAAAAA;
    
    /* 语义化颜色 */
    --success: #00A087;        /* 成功状态 */
    --warning: #F39B7F;        /* 强调/警告色 */
    --danger: #E64B35;         /* 错误提示 - 仅用于错误 */
    --info: #4DBBD5;
    
    /* 背景与边框 */
    --bg: #FAFAFA;
    --bg-secondary: #F5F5F5;
    --card-bg: #FFFFFF;
    --card-bg-hover: #F8F8F8;
    --border: #E0E0E0;
    --border-accent: #00A087;   /* 卡片边框强调 */
    
    /* 其他 */
    --radius: 8px;
    --shadow: 0 2px 12px rgba(60, 84, 136, 0.1);
}

/* 字体设置：英文数字Times New Roman，中文宋体 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Times New Roman', SimSun, serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.8;
    min-height: 100vh;
}

/* 英文和数字使用 Times New Roman */
.en, .english, code, pre, .code {
    font-family: 'Times New Roman', serif;
}

/* 中文使用宋体 - 自动处理 */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 隐藏类 */
.hidden {
    display: none !important;
}

/* Header */
.header {
    background: var(--card-bg);
    border-bottom: 2px solid var(--primary);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
}

.logo-icon {
    font-size: 1.6rem;
}

.nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radius);
    transition: all 0.2s;
    font-size: 0.95rem;
}

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

.nav-link.active {
    background: var(--primary);
    color: white;
}

.menu-toggle {
    display: none;
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1.2rem;
}

/* Main */
.main {
    padding: 32px 0;
}

/* Section */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
}

.main-tab-btn {
    cursor: pointer;
    padding: 4px 12px;
    border-radius: 6px;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.main-tab-btn:hover {
    color: var(--text);
    background: var(--hover-bg);
}

.main-tab-btn.active {
    color: var(--primary);
    font-weight: 600;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    border: 1px solid var(--border);
    transition: transform 0.2s, border-color 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 4px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    font-family: 'Times New Roman', SimSun, serif;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-light);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--border);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #008B74;
}

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

.btn-danger:hover:not(:disabled) {
    background: #D43D2A;
}

.btn-warning {
    background: var(--warning);
    color: var(--text);
}

.btn-warning:hover:not(:disabled) {
    background: #E88A6A;
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-outline:hover:not(:disabled) {
    background: var(--bg-secondary);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.1rem;
}

.btn-block {
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background: var(--card-bg);
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: 'Times New Roman', SimSun, serif;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(230, 75, 53, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    font-family: 'Times New Roman', SimSun, serif;
}

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

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Filter Bar */
.filter-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    align-items: center;
}

/* Lists */
.list {
    display: grid;
    gap: 16px;
}

.list-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.list-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.list-item-main {
    flex: 1;
    min-width: 0;
}

.list-item-title {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.list-item-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Paper Cards */
.paper-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all 0.2s;
}

.paper-card:hover {
    border-color: var(--secondary);
    box-shadow: var(--shadow);
}

.paper-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
    line-height: 1.5;
}

.paper-card-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.paper-card-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-primary {
    background: rgba(230, 75, 53, 0.1);
    color: var(--primary);
}

.badge-secondary {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.badge-success {
    background: rgba(0, 160, 135, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(243, 155, 127, 0.2);
    color: #C77A5E;
}

.badge-info {
    background: rgba(77, 187, 213, 0.1);
    color: var(--info);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(60, 84, 136, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    box-shadow: 0 10px 40px rgba(60, 84, 136, 0.2);
}

.modal-lg {
    max-width: 800px;
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.2rem;
    color: var(--text);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    line-height: 1;
}

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

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* Toast */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius);
    color: white;
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s ease;
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--danger);
}

.toast.warning {
    background: var(--warning);
    color: var(--text);
}

.toast.info {
    background: var(--info);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--border);
    border-radius: 24px;
    transition: 0.3s;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: 0.3s;
}

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

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

/* Settings Row */
.settings-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.settings-row:last-child {
    border-bottom: none;
}

.settings-label {
    font-weight: 500;
    color: var(--text);
}

/* Alert */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 0.9rem;
}

.alert-warning {
    background: rgba(243, 155, 127, 0.15);
    color: #B8694F;
    border: 1px solid rgba(243, 155, 127, 0.3);
}

.alert-info {
    background: rgba(77, 187, 213, 0.1);
    color: #2D8A9F;
    border: 1px solid rgba(77, 187, 213, 0.3);
}

.alert-success {
    background: rgba(0, 160, 135, 0.1);
    color: #006B59;
    border: 1px solid rgba(0, 160, 135, 0.3);
}

/* Text Utilities */
.text-muted {
    color: var(--text-muted);
}

.text-secondary {
    color: var(--text-secondary);
}

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

.text-success {
    color: var(--success);
}

.text-center {
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--card-bg);
        flex-direction: column;
        padding: 16px;
        border-top: 1px solid var(--border);
        box-shadow: var(--shadow);
    }
    
    .nav.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-bar > * {
        width: 100%;
    }
    
    .modal-content {
        margin: 10px;
        max-height: 85vh;
    }
    
    .list-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .paper-card-actions {
        flex-direction: column;
    }
    
    .paper-card-actions .btn {
        width: 100%;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text);
}

/* Selection */
::selection {
    background: rgba(230, 75, 53, 0.2);
    color: var(--text);
}

/* Links */
a {
    color: var(--secondary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary);
}

/* Progress Bar */
.progress-bar {
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* Loading Spinner */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Code blocks */
code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Times New Roman', monospace;
    font-size: 0.9em;
}

pre {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: var(--radius);
    overflow-x: auto;
    font-family: 'Times New Roman', monospace;
}

pre code {
    background: none;
    padding: 0;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

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

th {
    font-weight: 600;
    color: var(--text);
    background: var(--bg-secondary);
}

tr:hover {
    background: var(--bg-secondary);
}

/* Divider */
.divider {
    height: 1px;
    background: var(--border);
    margin: 20px 0;
}

/* Chip / Tag */
.chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    background: var(--bg-secondary);
    border-radius: 16px;
    font-size: 0.85rem;
    color: var(--text);
}

.chip-primary {
    background: rgba(230, 75, 53, 0.1);
    color: var(--primary);
}

.chip-secondary {
    background: rgba(77, 187, 213, 0.1);
    color: var(--secondary);
}

/* 期刊选择样式 */
.journal-category {
    margin-bottom: 16px;
}

.journal-category-title {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border);
}

.journal-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    margin: 4px 0;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.journal-item.selected {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.journal-item.selected .journal-item-name {
    color: white;
}

.journal-item.selected .journal-item-if {
    color: rgba(255, 255, 255, 0.8);
}

.journal-item-name {
    font-size: 0.95rem;
    color: var(--text);
}

.journal-item-if {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* 词汇学习全屏模式 */
.study-fullscreen {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 9999 !important;
    margin: 0 !important;
    padding: 20px !important;
    overflow-y: auto !important;
    background: var(--bg) !important;
    border-radius: 0 !important;
    box-shadow: none !important;
}

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

.study-fullscreen .question-area {
    min-height: calc(100vh - 200px);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.study-fullscreen .options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 20px;
}

@media (max-width: 600px) {
    .study-fullscreen .options-grid {
        grid-template-columns: 1fr;
    }
}

/* 全屏模式下的进度信息 */
.fullscreen-queue-info {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    padding: 12px 20px;
    z-index: 10000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}


/* 摘要翻译练习样式 */
.trans-section {
    margin-bottom: 20px;
}

.trans-done-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
}

.trans-done-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.trans-done-title {
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    margin-right: 12px;
}

.trans-done-date {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
}

.trans-done-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn-small {
    padding: 4px 12px;
    font-size: 12px;
    border-radius: 4px;
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.2s;
}

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

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

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

.btn-success {
    background: var(--success);
    color: white;
    border: none;
}

.btn-success:hover {
    opacity: 0.9;
}