/* ============================================
   公共基础样式 - 变量、Reset、布局、组件
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Clean White Palette */
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    
    --color-text-primary: #111827;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    
    --color-brand: #2563eb;
    --color-brand-hover: #1d4ed8;
    --color-brand-light: #eff6ff;
    
    --color-success: #10b981;
    --color-success-bg: #ecfdf5;
    --color-error: #ef4444;
    --color-error-bg: #fef2f2;
    --color-warning: #f59e0b;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-y: scroll;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    min-height: 100vh;
}

/* Layout */
.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Header */
.header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) 0;
}

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

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.logo svg {
    color: var(--color-brand);
}

.subtitle {
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Page Title */
.page-title {
    padding-top: 20px;
    text-align: center;
}

.page-heading {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.page-heading svg {
    color: var(--color-brand);
}

/* Main */
.main {
    flex: 1;
    padding: var(--space-10) 0;
}

/* Section Titles */
.section-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Upload Section */
.upload-section {
    margin-bottom: var(--space-8);
}

.upload-card {
    background-color: var(--color-surface);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-12) var(--space-8);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.upload-card:hover {
    border-color: var(--color-brand);
    background-color: var(--color-brand-light);
}

.upload-card.dragover,
.upload-area.dragover {
    border-color: var(--color-brand);
    background-color: var(--color-brand-light);
    transform: scale(1.01);
}

.file-input {
    display: none;
}

.upload-icon {
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
}

.upload-card:hover .upload-icon {
    color: var(--color-brand);
}

.upload-text {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.upload-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* File List */
.file-list {
    margin-top: var(--space-6);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
}

.file-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
}

.file-count {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.file-count strong {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-semibold);
}

.file-items {
    list-style: none;
    max-height: 300px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.file-item:hover {
    background-color: var(--color-border-light);
}

.file-item-info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    overflow: hidden;
}

.file-icon {
    flex-shrink: 0;
    color: var(--color-error);
}

.file-name {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-status {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    margin-right: var(--space-2);
}

.file-status.pending {
    background-color: var(--color-border-light);
    color: var(--color-text-secondary);
}

.file-status.processing {
    background-color: #fff8e1;
    color: var(--color-warning);
}

.file-status.success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
}

.file-status.error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
}

.file-remove {
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.file-remove:hover {
    color: var(--color-error);
    background-color: var(--color-error-bg);
}

/* Actions */
.actions {
    margin-top: var(--space-6);
    display: flex;
    justify-content: center;
    gap: var(--space-3);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:focus-visible {
    outline: 2px solid var(--color-brand);
    outline-offset: 2px;
}

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

.btn-primary {
    background-color: var(--color-brand);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-brand-hover);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-success:hover:not(:disabled) {
    background-color: #699ef5;
    box-shadow: var(--shadow-md);
}

.btn-text {
    background: none;
    border: none;
    color: var(--color-brand);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-text:hover {
    background-color: var(--color-brand-light);
}

/* Results Section */
.results-section {
    animation: fadeIn var(--transition-slow);
}

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

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.results-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.results-actions {
    display: flex;
    gap: var(--space-3);
}

/* Table */
.table-container {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    overflow-x: auto;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.results-table th,
.results-table td {
    padding: var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
}

.results-table th {
    background-color: var(--color-bg);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.results-table tbody tr:hover {
    background-color: var(--color-bg);
}

.results-table tbody tr:last-child td {
    border-bottom: none;
}

.old-name {
    color: var(--color-text-tertiary);
    text-decoration: line-through;
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.new-name {
    color: var(--color-brand);
    font-weight: var(--font-weight-medium);
    max-width: 400px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Animation */
@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Icon Buttons */
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    margin: 0 var(--space-1);
}

.btn-icon:hover {
    background-color: var(--color-border-light);
}

.btn-icon.download-single {
    color: var(--color-success);
}

.btn-icon.download-single:hover {
    background-color: var(--color-success-bg);
}

.btn-icon.delete-single {
    color: var(--color-error);
}

.btn-icon.delete-single:hover {
    background-color: var(--color-error-bg);
}

/* Status Badges */
.status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-sm);
}

.status-success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
}

.status-error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.empty-icon {
    color: var(--color-border);
    margin-bottom: var(--space-4);
}

.empty-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.empty-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    max-width: 400px;
    margin: 0 auto;
}

/* Footer */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--space-6) 0;
    text-align: center;
}

.footer p {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

/* Toast */
.toast {
    position: fixed;
    bottom: var(--space-6);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--color-text-primary);
    color: white;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

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

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

/* Privacy Notice */
.privacy-notice {
    background-color: var(--color-success-bg);
    border: 1px solid #a7f3d0;
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-5);
    margin-bottom: var(--space-8);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-sm);
    color: #065f46;
}

.privacy-notice svg {
    flex-shrink: 0;
    color: var(--color-success);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .main {
        padding: var(--space-6) 0;
    }
    
    .upload-card {
        padding: var(--space-8) var(--space-4);
    }
    
    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .results-actions {
        width: 100%;
    }
    
    .results-actions .btn {
        flex: 1;
    }
    
    .results-table {
        font-size: var(--font-size-xs);
    }
    
    .results-table th,
    .results-table td {
        padding: var(--space-3);
    }
    
    .actions {
        flex-direction: column;
    }
    
    .actions .btn {
        width: 100%;
    }
}

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

/* ============================================
   公共组件样式 - Header & Footer
   ============================================ */

/* 导航栏样式 */
.navbar {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: var(--space-8) !important;
}

.logo {
    display: inline-flex !important;
    align-items: center !important;
    gap: var(--space-3) !important;
    font-size: var(--font-size-lg) !important;
    font-weight: var(--font-weight-semibold) !important;
    color: var(--color-text-primary) !important;
    text-decoration: none !important;
    transition: color var(--transition-fast) !important;
    outline: none !important;
}

.logo:hover {
    color: var(--color-brand) !important;
}

.logo svg {
    flex-shrink: 0 !important;
    color: var(--color-brand) !important;
}

.nav-menu {
    display: flex !important;
    align-items: center !important;
    gap: var(--space-2) !important;
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
}

.nav-link {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: var(--space-2) !important;
    padding: var(--space-2) var(--space-4) !important;
    font-size: var(--font-size-sm) !important;
    font-weight: var(--font-weight-medium) !important;
    color: var(--color-text-secondary) !important;
    text-decoration: none !important;
    border-radius: var(--radius-md) !important;
    transition: all var(--transition-fast) !important;
}

.nav-link:hover {
    color: var(--color-text-primary) !important;
    background-color: var(--color-border-light) !important;
}

.nav-link.active {
    color: var(--color-brand) !important;
    background-color: var(--color-brand-light) !important;
}

.header.is-transitioning .logo,
.header.is-transitioning .nav-link {
    pointer-events: none !important;
}

.header.is-transitioning .logo:not(.is-loading),
.header.is-transitioning .nav-link:not(.is-loading) {
    opacity: 0.55;
}

.logo.is-loading,
.nav-link.is-loading {
    color: var(--color-brand) !important;
}

.logo.is-loading::after,
.nav-link.is-loading::after {
    content: '';
    width: 14px;
    height: 14px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 999px;
    flex-shrink: 0;
    animation: nav-loading-spin 0.7s linear infinite;
}

@keyframes nav-loading-spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* 简洁页脚样式 */
.footer-simple {
    padding: var(--space-6) 0 !important;
    text-align: center !important;
}

.footer-simple p {
    font-size: var(--font-size-sm) !important;
    color: var(--color-text-tertiary) !important;
    margin: 0 !important;
}

/* 响应式适配 */
@media (max-width: 640px) {
    .navbar {
        flex-direction: column !important;
        gap: var(--space-4) !important;
    }

    .nav-menu {
        width: 100% !important;
        justify-content: center !important;
    }
}