/* 亮色主题（默认） */
:root {
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    --card-bg: #ffffff;
    --card-header-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border-color: #e9ecef;
    --stat-bg: #f8f9fa;
    --stat-hover-bg: #e9ecef;
    --time-row-bg: #ffffff;
    --utc-badge-bg: #e3f2fd;
    --utc-badge-text: #1976d2;
    --local-badge-bg: #f3e5f5;
    --local-badge-text: #7b1fa2;
    --repo-url-bg: #fff;
    --repo-url-border: #e9ecef;
    --repo-url-text: #495057;
    --empty-state-icon: #ddd;
    --lang-btn-bg: rgba(255,255,255,0.2);
    --lang-btn-border: rgba(255,255,255,0.3);
    --lang-btn-text: #ffffff;
    --lang-btn-hover-bg: #ffffff;
    --lang-btn-hover-text: #667eea;
}

/* 暗色主题 */
[data-theme="dark"] {
    --bg-gradient-start: #1a1a2e;
    --bg-gradient-end: #16213e;
    --card-bg: #1f2937;
    --card-header-bg: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --border-color: #374151;
    --stat-bg: #2d3748;
    --stat-hover-bg: #4a5568;
    --time-row-bg: #1f2937;
    --utc-badge-bg: #1e3a5f;
    --utc-badge-text: #93c5fd;
    --local-badge-bg: #4c1d95;
    --local-badge-text: #c4b5fd;
    --repo-url-bg: #111827;
    --repo-url-border: #374151;
    --repo-url-text: #d1d5db;
    --empty-state-icon: #4b5563;
    --lang-btn-bg: rgba(255,255,255,0.1);
    --lang-btn-border: rgba(255,255,255,0.2);
    --lang-btn-text: #e5e7eb;
    --lang-btn-hover-bg: #374151;
    --lang-btn-hover-text: #93c5fd;
}

body {
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    padding: 20px 0;
    transition: all 0.3s ease;
}

.layui-container {
    max-width: 900px;
}

.layui-card {
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    background: var(--card-bg);
}

.layui-card-body {
    background: var(--card-bg) !important;
    color: var(--text-primary) !important;
}

.layui-card-header {
    background: var(--card-header-bg);
    color: var(--text-primary);
    border-radius: 15px 15px 0 0;
    padding: 20px;
}

.layui-card-header h2 {
    margin: 0;
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 表单元素暗黑主题 */
.layui-form-label {
    color: var(--text-primary) !important;
}

.layui-input {
    background-color: var(--repo-url-bg) !important;
    border-color: var(--repo-url-border) !important;
    color: var(--repo-url-text) !important;
}

.layui-input:focus {
    border-color: #667eea !important;
}

.layui-btn-primary {
    background-color: var(--card-bg) !important;
    color: var(--text-primary) !important;
    border-color: var(--border-color) !important;
}

.layui-btn-primary:hover {
    border-color: #667eea !important;
    color: #667eea !important;
}

.result-card {
    margin-top: 20px;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.stat-item {
    background: var(--stat-bg);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 15px;
    transition: all 0.3s;
    border-left: 4px solid #667eea;
}

.stat-item:hover {
    background: var(--stat-hover-bg);
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    font-weight: 500;
}

.stat-icon {
    font-size: 20px;
    margin-right: 10px;
    color: #667eea;
}

.time-section {
    margin-bottom: 10px;
}

.time-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    padding: 8px 12px;
    background: var(--time-row-bg);
    border-radius: 6px;
}

.time-label {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

.time-value {
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    font-family: 'Courier New', monospace;
}

.utc-badge {
    display: inline-block;
    background: var(--utc-badge-bg);
    color: var(--utc-badge-text);
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    margin-left: 8px;
}

.local-badge {
    display: inline-block;
    background: var(--local-badge-bg);
    color: var(--local-badge-text);
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    margin-left: 8px;
}

.time-diff-badge {
    display: inline-flex;
    align-items: center;
    background: var(--card-header-bg);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-top: 10px;
    box-shadow: 0 3px 10px rgba(102, 126, 234, 0.4);
}

.time-diff-badge i {
    margin-right: 6px;
    font-size: 16px;
}

.repo-url {
    background: var(--repo-url-bg);
    border: 2px solid var(--repo-url-border);
    border-radius: 8px;
    padding: 12px 16px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    color: var(--repo-url-text);
    word-break: break-all;
}

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

.empty-state i {
    font-size: 64px;
    margin-bottom: 15px;
    display: block;
    color: var(--empty-state-icon);
}

.lang-switch {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.lang-btn {
    background: var(--lang-btn-bg);
    border: 1px solid var(--lang-btn-border);
    color: var(--lang-btn-text);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.3s;
    margin-left: 5px;
}

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

.export-buttons {
    margin-top: 15px;
    text-align: center;
}

.export-buttons button {
    margin: 0 5px;
}

/* 主题切换按钮图标 */
#themeToggle i {
    font-size: 16px;
}