/* GitHub-inspired CSS Variables */
:root {
    --color-canvas-default: #ffffff;
    --color-canvas-subtle: #f6f8fa;
    --color-border-default: #d0d7de;
    --color-border-muted: #d8dee4;
    --color-fg-default: #1f2328;
    --color-fg-muted: #656d76;
    --color-fg-subtle: #6e7781;
    --color-accent-fg: #0969da;
    --color-accent-emphasis: #0969da;
    --color-success-fg: #1a7f37;
    --color-danger-fg: #d1242f;
    --color-btn-bg: #f6f8fa;
    --color-btn-border: #d0d7de;
    --color-btn-text: #24292f;
    --color-btn-hover-bg: #f3f4f6;
    --color-btn-active-bg: #d0d7de;
    --color-header-bg: #24292f;
    --color-header-text: #ffffff;
    --color-box-bg: #ffffff;
    --color-box-border: #d0d7de;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-fg-default);
    background-color: var(--color-canvas-default);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header Styles */
.header {
    background-color: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border-default);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.repository-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.repository-header .site-logo {
    /* 默认样式，将被config.js动态更新 */
    height: 32px;
    width: 32px;
    border-radius: 6px;
    transition: all 0.3s ease;
    object-fit: cover;
    vertical-align: middle;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.repository-header .site-logo:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* Logo响应式设计 */
@media (max-width: 768px) {
    .repository-header .site-logo {
        height: 28px;
        width: 28px;
    }
}

@media (max-width: 480px) {
    .repository-header .site-logo {
        height: 24px;
        width: 24px;
    }
}

.repository-header svg {
    fill: var(--color-header-text);
}

.repo-info h1 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
    color: var(--color-header-text);
}

.repo-description {
    margin: 4px 0 0 0;
    color: #8b949e;
    font-size: 14px;
}

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

.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: none;
    border: 1px solid transparent;
    border-radius: 6px;
    color: #8b949e;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-header-text);
}

.nav-item.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-header-text);
}

/* Main Content */
.main {
    min-height: calc(100vh - 80px);
    padding: 24px 0;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

/* Section Styles */
.file-section, .preview-section {
    background-color: var(--color-box-bg);
    border: 1px solid var(--color-box-border);
    border-radius: 6px;
    overflow: hidden;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--color-border-default);
    background-color: var(--color-canvas-subtle);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb-item {
    color: var(--color-fg-default);
    font-weight: 600;
}

.file-actions {
    display: flex;
    gap: 8px;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.25;
    color: var(--color-btn-text);
    background-color: var(--color-btn-bg);
    border: 1px solid var(--color-btn-border);
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

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

.btn:active {
    background-color: var(--color-btn-active-bg);
}

.btn-sm {
    padding: 4px 8px;
    font-size: 12px;
}

.btn-primary {
    background-color: var(--color-accent-emphasis);
    border-color: var(--color-accent-emphasis);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #0860ca;
    border-color: #0860ca;
}

/* File List Styles */
.file-list {
    padding: 16px;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    border: 1px solid transparent;
}

.file-item:hover {
    background-color: var(--color-canvas-subtle);
}

.file-icon {
    width: 16px;
    height: 16px;
    margin-right: 12px;
    color: #dc2626;
}

.file-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.file-name {
    font-weight: 600;
    color: var(--color-accent-fg);
    text-decoration: none;
}

.file-name:hover {
    text-decoration: underline;
}

.file-meta {
    font-size: 12px;
    color: var(--color-fg-muted);
}

.file-size {
    margin-left: auto;
    font-size: 12px;
    color: var(--color-fg-muted);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 48px 16px;
    color: var(--color-fg-muted);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    margin: 0 0 8px 0;
    font-size: 16px;
    font-weight: 600;
}

.empty-state small {
    font-size: 14px;
}

/* Preview Section */
.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--color-border-default);
    background-color: var(--color-canvas-subtle);
}

.preview-info h2 {
    margin: 0 0 4px 0;
    font-size: 16px;
    font-weight: 600;
}

.preview-info span {
    font-size: 12px;
    color: var(--color-fg-muted);
}

.preview-actions {
    display: flex;
    gap: 8px;
}

.preview-content {
    height: 70vh;
    min-height: 400px;
}

#pdfViewer {
    border: none;
    background: #ffffff;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

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

.loading-overlay .spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

.loading-overlay p {
    color: #ffffff;
    font-size: 16px;
    margin: 0;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }
    
    .repository-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .header-nav {
        justify-content: center;
    }
    
    .section-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .file-actions {
        justify-content: flex-start;
    }
    
    .preview-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .preview-actions {
        justify-content: flex-start;
    }
    
    .preview-content {
        height: 60vh;
    }
}

/* File size formatting */
.file-size-unit {
    font-weight: 600;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--color-canvas-subtle);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-muted);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-border-default);
}