/* ============================================================
   DocCompare - 合同文档智能对比系统
   Premium Design System
   ============================================================ */

/* ---------- CSS Variables / Design Tokens ---------- */
:root {
    /* Colors */
    --color-bg: #0d1117;
    --color-bg-secondary: #010409;
    --color-bg-card: rgba(13, 17, 23, 0.95);
    --color-border: #30363d;
    --color-border-hover: #8b949e;

    --color-text-primary: #c9d1d9;
    --color-text-secondary: #8b949e;
    --color-text-muted: #484f58;

    --color-accent: #238636;
    --color-accent-light: #2ea043;
    --color-accent-dark: #238636;

    --color-success: #2ea043;
    --color-danger: #f85149;
    --color-warning: #d29922;

  --color-original: #f85149;
  --color-scanned: #3fb950;

  /* Background Colors */
  --color-success-bg: rgba(46, 160, 67, 0.15);
  --color-warning-bg: rgba(210, 153, 34, 0.15);
  --color-danger-bg: rgba(248, 81, 73, 0.15);
  --color-original-bg: rgba(248, 81, 73, 0.15);
  --color-scanned-bg: rgba(63, 185, 80, 0.12);
  --color-surface: rgba(22, 27, 34, 0.8);
  --color-bg-card-hover: rgba(22, 27, 34, 1);
  --color-accent-glow: rgba(35, 134, 54, 0.4);

  /* Typography */
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px var(--color-accent-glow);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ---------- Background Decorations ---------- */
.bg-decoration {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

.bg-orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.bg-orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #8b5cf6 0%, transparent 70%);
    bottom: -150px;
    left: -150px;
    animation-delay: -7s;
}

.bg-orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #06b6d4 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(15px, 10px) scale(1.02); }
}

/* ---------- Navbar ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    background: rgba(10, 14, 26, 0.75);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-normal);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-accent), #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 0 20px var(--color-accent-glow);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.logo-badge {
    font-size: 0.65rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-accent), #8b5cf6);
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-links {
    display: flex;
    gap: var(--space-xs);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-primary);
    background: var(--color-surface);
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    z-index: 1;
    padding: 140px var(--space-xl) 60px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
}

.title-highlight {
    background: linear-gradient(135deg, var(--color-accent-light), #c084fc, #f472b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-2xl);
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.feature-chip {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 8px 18px;
    border-radius: var(--radius-full);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-normal);
}

.feature-chip:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

.feature-chip svg {
    opacity: 0.7;
}

/* ---------- Upload Section ---------- */
.upload-section {
    position: relative;
    z-index: 1;
    padding: var(--space-3xl) var(--space-xl);
}

.upload-container {
    max-width: 1000px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
}

.section-header p {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

.upload-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

@media (max-width: 768px) {
    .upload-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- Upload Card ---------- */
.upload-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    backdrop-filter: blur(10px);
    transition: var(--transition-normal);
}

.upload-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-glow);
}

.upload-card-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.upload-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
}

.original-icon {
    background: var(--color-original-bg);
    color: var(--color-original);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.scanned-icon {
    background: var(--color-scanned-bg);
    color: var(--color-scanned);
    border: 1px solid rgba(139, 148, 158, 0.2);
}

.upload-card-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.upload-card-header p {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ---------- Dropzone ---------- */
.upload-dropzone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.upload-dropzone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, var(--color-accent-glow));
    opacity: 0;
    transition: var(--transition-normal);
}

.upload-dropzone:hover,
.upload-dropzone.drag-over {
    border-color: var(--color-accent);
    background: rgba(99, 102, 241, 0.05);
}

.upload-dropzone:hover::before,
.upload-dropzone.drag-over::before {
    opacity: 1;
}

.dropzone-content {
    position: relative;
    z-index: 1;
}

.dropzone-icon {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    transition: var(--transition-normal);
}

.upload-dropzone:hover .dropzone-icon {
    color: var(--color-accent-light);
    transform: translateY(-4px);
}

.dropzone-text {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 4px;
}

.dropzone-hint {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.dropzone-formats {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    padding: 2px 10px;
    border-radius: var(--radius-full);
    background: var(--color-surface);
}

/* File Preview */
.file-preview {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.file-preview-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--color-accent-glow);
    color: var(--color-accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.file-preview-info {
    flex: 1;
    text-align: left;
    min-width: 0;
}

.file-preview-name {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-preview-size {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.file-remove {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

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

/* ---------- Compare Button ---------- */
.submit-area {
    text-align: center;
    margin-top: var(--space-2xl);
}

.btn-compare {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 260px;
    height: 52px;
    padding: 0 32px;
    border: none;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-accent), #8b5cf6);
    color: white;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: 0 4px 20px var(--color-accent-glow);
    position: relative;
    overflow: hidden;
}

.btn-compare::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: var(--transition-fast);
}

.btn-compare:hover:not(:disabled)::before {
    opacity: 1;
}

.btn-compare:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px var(--color-accent-glow);
}

.btn-compare:active:not(:disabled) {
    transform: translateY(0);
}

.btn-compare:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-text {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-loading {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ---------- Progress Section ---------- */
.progress-section {
    position: relative;
    z-index: 1;
    padding: var(--space-2xl) var(--space-xl);
}

.progress-container {
    max-width: 700px;
    margin: 0 auto;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    backdrop-filter: blur(10px);
}

.progress-header {
    margin-bottom: var(--space-xl);
}

.progress-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-accent-glow);
    color: var(--color-accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
    position: relative;
}

.pulse-ring {
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
    animation: pulse-ring 1.5s ease-out infinite;
}

@keyframes pulse-ring {
    0% { transform: scale(1); opacity: 0.6; }
    100% { transform: scale(1.4); opacity: 0; }
}

.progress-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.progress-header p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.progress-bar-track {
    height: 6px;
    background: var(--color-surface);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-xl);
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-accent), #8b5cf6);
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    gap: var(--space-sm);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    flex: 1;
}

.step-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-text-muted);
    transition: var(--transition-normal);
}

.step.active .step-dot {
    background: var(--color-accent);
    border-color: var(--color-accent);
    box-shadow: 0 0 10px var(--color-accent-glow);
}

.step.done .step-dot {
    background: var(--color-success);
    border-color: var(--color-success);
}

.step span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    transition: var(--transition-normal);
}

.step.active span,
.step.done span {
    color: var(--color-text-primary);
}

/* ---------- Result Section ---------- */
.result-section {
    position: relative;
    z-index: 1;
    padding: var(--space-3xl) var(--space-xl);
}

.result-container {
    max-width: 1100px;
    margin: 0 auto;
}

/* Summary */
.result-summary {
    margin-bottom: var(--space-xl);
}

.summary-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-xl);
}

.summary-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.summary-meta {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

@media (max-width: 768px) {
    .summary-cards {
        grid-template-columns: 1fr;
    }
}

.summary-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    backdrop-filter: blur(10px);
    transition: var(--transition-normal);
}

.summary-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.summary-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
}

.similarity-card .summary-card-icon {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.diff-count-card .summary-card-icon {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.verdict-card .summary-card-icon {
    background: var(--color-accent-glow);
    color: var(--color-accent-light);
}

.summary-card-value {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.summary-card-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.similarity-bar {
    height: 4px;
    background: var(--color-surface);
    border-radius: var(--radius-full);
    margin-top: var(--space-md);
    overflow: hidden;
}

.similarity-bar-fill {
    height: 100%;
    width: 0%;
    border-radius: var(--radius-full);
    transition: width 1s ease;
}

/* Verdict States */
.verdict-card.safe {
    border-color: rgba(16, 185, 129, 0.3);
}
.verdict-card.safe .summary-card-icon {
    background: var(--color-success-bg);
    color: var(--color-success);
}
.verdict-card.safe .summary-card-value {
    color: var(--color-success);
}

.verdict-card.warning {
    border-color: rgba(245, 158, 11, 0.3);
}
.verdict-card.warning .summary-card-icon {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}
.verdict-card.warning .summary-card-value {
    color: var(--color-warning);
}

.verdict-card.danger {
    border-color: rgba(239, 68, 68, 0.3);
}
.verdict-card.danger .summary-card-icon {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}
.verdict-card.danger .summary-card-value {
    color: var(--color-danger);
}

/* File Info Bar */
.file-info-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.file-info-item {
    font-size: 0.875rem;
}

.file-info-label {
    color: var(--color-text-muted);
}

.file-info-value {
    color: var(--color-text-primary);
    font-weight: 500;
}

.file-info-divider {
    color: var(--color-accent-light);
    font-size: 1.25rem;
}

/* Tabs */
.result-tabs {
    display: flex;
    gap: 4px;
    padding: 4px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 10px 16px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-muted);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tab-btn:hover {
    color: var(--color-text-secondary);
    background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
    background: var(--color-bg-card);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- Three-Column Diff Table ---------- */

/* Table Header */
.diff-table-header {
    display: grid;
    grid-template-columns: 1fr 1fr 180px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    position: sticky;
    top: 64px;
    z-index: 10;
    backdrop-filter: blur(10px);
}

.diff-table-hcell {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 16px;
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--color-text-muted);
    border-right: 1px solid var(--color-border);
    letter-spacing: 0.03em;
}

.diff-table-hcell:last-child {
    border-right: none;
}

.original-hcell { color: #f87171; }
.scanned-hcell { color: #34d399; }
.info-hcell { color: var(--color-text-muted); }

/* Diff Rows - 关键修复：使用子网格确保两栏内容水平对齐 */
.diff-row {
  display: grid;
  grid-template-columns: 1fr 1fr 200px;
  background: #0d1117;
  border-bottom: 1px solid #30363d;
  transition: background 0.2s;
  animation: fadeIn 0.3s ease backwards;
  align-items: stretch; /* 强制三栏高度一致 */
}

.diff-row:hover {
    background: #161b22;
}

/* Diff Cells */
.diff-cell {
    padding: 20px 24px;
    font-size: 14px;
    line-height: 1.8;
    word-break: break-all;
    white-space: pre-wrap;
    position: relative;
    border-right: 1px solid #30363d;
}

.diff-cell:last-child {
    border-right: none;
}

.diff-row.delete .original, .diff-row.replace .original {
    background: rgba(248, 81, 73, 0.08); /* 稍微加深一点背景 */
    border-left: 4px solid #f85149;
}

.diff-row.insert .scanned, .diff-row.replace .scanned {
    background: rgba(63, 185, 80, 0.08);
    border-left: 4px solid #3fb950;
}

.diff-row.equal {
    opacity: 0.3; /* 进一步调暗完全相同的段落 */
    filter: brightness(0.7);
    transition: opacity 0.2s;
}

.diff-row.equal:hover {
    opacity: 0.8;
}

.diff-cell.info {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 20px 12px;
    background: rgba(0, 0, 0, 0.2);
}

.diff-cell-empty {
  color: var(--color-text-muted);
  font-style: italic;
  font-size: 0.8125rem;
  opacity: 0.7;
  background: repeating-linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.01),
    rgba(255, 255, 255, 0.01) 10px,
    rgba(255, 255, 255, 0.03) 10px,
    rgba(255, 255, 255, 0.03) 20px
  );
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 20px 16px;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/* Row number inside cell */
.diff-cell-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--color-surface);
    font-size: 0.7rem;
    color: var(--color-text-muted);
    font-weight: 700;
    margin-right: 8px;
    flex-shrink: 0;
    vertical-align: middle;
}

/* Badge in info column */
.diff-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.diff-badge.replace {
    background: var(--color-warning-bg);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

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

.diff-badge.insert {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid rgba(46, 160, 67, 0.2);
}

.diff-badge.equal {
    background: rgba(100, 116, 139, 0.05);
    color: rgba(148, 163, 184, 0.3);
    border: 1px solid rgba(100, 116, 139, 0.08);
}

.diff-desc {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.5;
}

.diff-location-text {
    font-size: 0.6875rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    opacity: 0.7;
}

/* ===== Inline Diff Highlights (Professional Colors) ===== */
.diff-same {
    color: #484f58; /* 没变动的文字使用深灰色 */
    opacity: 0.5;
}

.diff-del {
    background: rgba(248, 81, 73, 0.2);
    color: #f85149;
    padding: 2px 4px;
    border-radius: 2px;
    font-weight: 800;
}

.diff-ins {
    background: rgba(63, 185, 80, 0.15);
    color: #3fb950;
    padding: 2px 4px;
    border-radius: 2px;
    font-weight: 800;
}

.diff-equal {
    color: #484f58;
    opacity: 0.4;
}

/* Page Alignment Placeholders */
.page-placeholder-empty {
    color: var(--color-text-muted);
    font-style: italic;
    background: repeating-linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.02),
        rgba(255, 255, 255, 0.02) 10px,
        rgba(255, 255, 255, 0.04) 10px,
        rgba(255, 255, 255, 0.04) 20px
    );
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-sm);
    padding: 30px 20px;
    text-align: center;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-placeholder-del {
    border-left: 4px solid var(--color-danger);
    padding-left: 15px;
}

.page-placeholder-ins {
    border-left: 4px solid var(--color-success);
    padding-left: 15px;
}

/* No Diff Message */
.no-diff-message {
    text-align: center;
    padding: var(--space-3xl);
}

.no-diff-icon {
    color: var(--color-success);
    margin-bottom: var(--space-lg);
}

.no-diff-message h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-success);
}

.no-diff-message p {
    color: var(--color-text-muted);
}

/* ---------- Side by Side (HTML Diff) ---------- */
.html-diff-wrapper {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: auto;
    max-height: 600px;
}

.html-diff-wrapper table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    font-family: var(--font-sans);
}

.html-diff-wrapper td {
    padding: 4px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    vertical-align: top;
}

.html-diff-wrapper th {
    padding: 10px 12px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: 0.8125rem;
    text-align: left;
    position: sticky;
    top: 0;
    z-index: 1;
}

.html-diff-wrapper .diff_header {
    background: var(--color-surface);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    text-align: right;
    width: 40px;
}

.html-diff-wrapper .diff_add {
    background: rgba(16, 185, 129, 0.08);
    color: var(--color-success);
}

.html-diff-wrapper .diff_sub {
    background: rgba(239, 68, 68, 0.08);
    color: var(--color-danger);
}

.html-diff-wrapper .diff_chg {
    background: rgba(245, 158, 11, 0.08);
    color: var(--color-warning);
}

/* ---------- Full Text ---------- */
.full-text-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

@media (max-width: 768px) {
    .full-text-grid {
        grid-template-columns: 1fr;
    }
}

.full-text-panel {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.panel-header {
    padding: var(--space-md) var(--space-lg);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.panel-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.panel-body {
    padding: var(--space-lg);
    max-height: 500px;
    overflow-y: auto;
    font-size: 0.875rem;
    line-height: 1.8;
    white-space: pre-wrap;
    word-break: break-all;
    color: var(--color-text-primary);
}

/* Custom Scrollbar */
.panel-body::-webkit-scrollbar,
.html-diff-wrapper::-webkit-scrollbar {
    width: 6px;
}

.panel-body::-webkit-scrollbar-track,
.html-diff-wrapper::-webkit-scrollbar-track {
    background: transparent;
}

.panel-body::-webkit-scrollbar-thumb,
.html-diff-wrapper::-webkit-scrollbar-thumb {
    background: var(--color-surface);
    border-radius: var(--radius-full);
}

/* ---------- Result Actions ---------- */
.result-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-2xl);
}

.btn-secondary,
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius-full);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

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

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent), #8b5cf6);
    color: white;
    box-shadow: 0 4px 20px var(--color-accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px var(--color-accent-glow);
}

/* ---------- How Section ---------- */
.how-section {
    position: relative;
    z-index: 1;
    padding: var(--space-3xl) var(--space-xl) 80px;
}

.how-container {
    max-width: 1000px;
    margin: 0 auto;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

@media (max-width: 768px) {
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

.step-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition-normal);
}

.step-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-glow);
}

.step-number {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 3rem;
    font-weight: 800;
    color: rgba(99, 102, 241, 0.08);
    line-height: 1;
}

.step-icon-wrap {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-lg);
    background: var(--color-accent-glow);
    color: var(--color-accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-lg);
    transition: var(--transition-normal);
}

.step-card:hover .step-icon-wrap {
    transform: scale(1.1);
    box-shadow: 0 0 30px var(--color-accent-glow);
}

.step-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.step-card p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ---------- Footer ---------- */
.footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl);
    text-align: center;
}

.footer-content p {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ---------- Animations ---------- */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.upload-card {
    animation: slideUp 0.5s ease backwards;
}

.upload-card:nth-child(2) {
    animation-delay: 0.1s;
}

.step-card {
    animation: slideUp 0.5s ease backwards;
}

.step-card:nth-child(2) { animation-delay: 0.15s; }
.step-card:nth-child(3) { animation-delay: 0.3s; }

/* Counter Animation */
@keyframes countUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.summary-card {
    animation: slideUp 0.5s ease backwards;
}

.summary-card:nth-child(2) { animation-delay: 0.1s; }
.summary-card:nth-child(3) { animation-delay: 0.2s; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
    .hero {
        padding: 110px var(--space-md) 40px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle br {
        display: none;
    }

    .upload-section, .result-section, .how-section {
        padding-left: var(--space-md);
        padding-right: var(--space-md);
    }

    .upload-card {
        padding: var(--space-lg);
    }

    .diff-item-body {
        grid-template-columns: 1fr;
    }

    .summary-header {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .file-info-bar {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

/* ---------- Aligned Synchronized Viewer ---------- */
/* 核心：同步对齐查看器，确保回件新增内容时，原文侧自动产生高度对等的占位 */
.aligned-viewer {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    max-height: 85vh; /* 适配大屏幕高度 */
    backdrop-filter: blur(20px);
    margin-top: var(--space-md);
}

.aligned-header {
    display: grid;
    grid-template-columns: 48px 1fr 1fr;
    background: var(--color-surface);
    border-bottom: 2px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-col {
    padding: 16px 24px;
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--color-text-primary);
    text-align: center;
    border-right: 1px solid var(--color-border);
    background: rgba(10, 14, 26, 0.9);
    backdrop-filter: blur(10px);
}

.header-col:last-child {
    border-right: none;
}

.aligned-body {
    overflow-y: auto;
    padding: 0;
    background: rgba(0, 0, 0, 0.2);
    /* 自定义美化滚动条 */
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.aligned-body::-webkit-scrollbar {
    width: 6px;
}
.aligned-body::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 99px;
}

.aligned-row {
    display: grid;
    grid-template-columns: 48px 1fr 1fr;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: background 0.1s;
    align-items: stretch; /* 强制两侧高度保持一致 */
}

.aligned-row:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* ===== 大条行（主锚点）===== */
.aligned-row.major-anchor {
    border-top: 2px solid rgba(255, 255, 255, 0.08);
    margin-top: 4px;
    background: rgba(22, 27, 34, 0.5);
}

.aligned-row.major-anchor .aligned-cell {
    font-weight: 600;
}

.aligned-row.major-anchor .aligned-num {
    background: rgba(0, 0, 0, 0.35);
}

.aligned-row.major-anchor.equal {
    opacity: 0.5;
}

/* 大条序号标签 */
.major-anchor-num {
    font-size: 0.65rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: #8b949e;
    white-space: pre-wrap;
    word-break: break-all;
    text-align: center;
    line-height: 1.3;
}

.aligned-row.major-anchor.replace .major-anchor-num,
.aligned-row.major-anchor.delete .major-anchor-num {
    color: #f85149;
}

.aligned-row.major-anchor.insert .major-anchor-num {
    color: #3fb950;
}

/* 普通行中间点 */
.row-dot {
    font-size: 1.1rem;
    color: #30363d;
    line-height: 1;
}

/* 序号单元格 */
.aligned-num {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6875rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: #30363d;
    background: rgba(0, 0, 0, 0.25);
    border-right: 1px solid rgba(255, 255, 255, 0.06);
    user-select: none;
}

.aligned-row.replace .aligned-num,
.aligned-row.delete .aligned-num,
.aligned-row.insert .aligned-num {
    color: #8b949e;
}

.aligned-cell {
    padding: 24px 36px;
    font-size: 0.9375rem;
    line-height: 1.8;
    white-space: pre-wrap;
    word-break: break-all;
    border-right: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.aligned-cell:last-child {
    border-right: none;
}

/* 次锚点行（1. 2. 3. 等）：比普通行更突出，比主锚点更低调 */
.aligned-row.minor-anchor {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.015);
}

.aligned-row.minor-anchor .aligned-num {
    background: rgba(139, 148, 158, 0.12);
}

.aligned-row.minor-anchor.replace .aligned-num,
.aligned-row.minor-anchor.delete .aligned-num {
    background: rgba(248, 81, 73, 0.1);
}

.aligned-row.minor-anchor.insert .aligned-num {
    background: rgba(63, 185, 80, 0.1);
}

/* 次锚点序号标签 */
.minor-anchor-num {
    font-size: 0.7rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: #8b949e;
    white-space: nowrap;
    letter-spacing: 0.01em;
}

.aligned-row.replace .minor-anchor-num,
.aligned-row.delete .minor-anchor-num {
    color: #f85149;
}

.aligned-row.insert .minor-anchor-num {
    color: #3fb950;
}

/* 空白对齐占位（对面有内容，本侧缺失） */
.align-placeholder {
    height: 100%;
    min-height: 60px;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 4px,
        rgba(255, 255, 255, 0.02) 4px,
        rgba(255, 255, 255, 0.02) 8px
    );
    border-radius: 4px;
}

/* 页分隔条 */
.page-separator-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 12px;
    padding: 10px 24px;
    background: rgba(99, 102, 241, 0.08);
    border-top: 2px solid rgba(99, 102, 241, 0.25);
    border-bottom: 2px solid rgba(99, 102, 241, 0.25);
}

.page-separator-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: rgba(99, 102, 241, 0.9);
    text-align: center;
    padding: 3px 12px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 4px;
    white-space: nowrap;
}

.page-separator-line {
    width: 40px;
    height: 2px;
    background: rgba(99, 102, 241, 0.3);
    border-radius: 1px;
}

/* 在对齐视图中覆盖 equal 默认样式，提高阅读清晰度 */
.aligned-row.equal {
    opacity: 0.4;
}

.aligned-row.delete .original {
    background: rgba(248, 81, 73, 0.15); /* 加深红区 */
    border-right: 2px solid rgba(248, 81, 73, 0.3);
}

.aligned-row.insert .scanned {
    background: rgba(63, 185, 80, 0.08);
    border-left: 2px solid rgba(63, 185, 80, 0.3);
}

.aligned-row.replace .original {
    background: rgba(248, 81, 73, 0.1);
    border-right: 1px solid rgba(248, 81, 73, 0.2);
}

.aligned-row.replace .scanned {
    background: rgba(63, 185, 80, 0.08);
    border-left: 1px solid rgba(63, 185, 80, 0.2);
}

/* 核心对齐占位符：当回件新增内容时，在原文侧显示的自适应空白区 */
.aligned-row .page-placeholder-empty {
    min-height: 80px;
    padding: 30px;
    opacity: 0.4;
    color: var(--color-text-muted);
    font-style: italic;
    background: repeating-linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.01),
        rgba(255, 255, 255, 0.01) 10px,
        rgba(255, 255, 255, 0.03) 10px,
        rgba(255, 255, 255, 0.03) 20px
    );
    border: 1px dashed rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 100%; /* 确保填满 grid 单元格 */
}

@media (max-width: 992px) {
    .aligned-cell {
        padding: 16px 20px;
        font-size: 0.875rem;
    }
}

/* ---------- Batch Mode ---------- */
.mode-toggle {
    display: flex;
    gap: 0;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    width: fit-content;
}
.mode-btn {
    padding: 8px 20px;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}
.mode-btn.active {
    background: var(--color-accent);
    color: #fff;
}
.mode-btn:hover:not(.active) {
    background: rgba(255,255,255,0.05);
}
/* Batch row */
.batch-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    margin-bottom: 8px;
    transition: border-color 0.3s;
}
.batch-row .row-idx {
    color: var(--color-accent-light);
    font-weight: 700;
    font-size: 1rem;
    min-width: 30px;
    text-align: center;
}
.batch-row .row-files {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
}
.batch-row .file-pick {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: rgba(255,255,255,0.04);
    border: 1px dashed var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    min-height: 44px;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}
.batch-row .file-pick:hover {
    border-color: var(--color-accent);
    background: rgba(35,134,54,0.05);
}
.batch-row .file-pick.has-file {
    border-style: solid;
    border-color: var(--color-border);
    color: var(--color-text-primary);
}
.batch-row .file-pick .pick-label {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    min-width: 40px;
}
.batch-row .row-arrow {
    color: var(--color-text-muted);
    font-size: 1.2rem;
    flex-shrink: 0;
}
.batch-row .row-remove {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s;
    flex-shrink: 0;
}
.batch-row .row-remove:hover {
    color: #f85149;
    background: rgba(248,81,73,0.1);
}
.batch-row .row-status {
    font-size: 0.8rem;
    min-width: 80px;
    text-align: right;
}
.batch-row.processing {
    border-color: #f0883e;
}
.batch-row.done {
    border-color: var(--color-accent);
}
.batch-row.error {
    border-color: #f85149;
}
.btn-add-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: rgba(255,255,255,0.04);
    border: 1px dashed var(--color-border);
    border-radius: 8px;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    margin: 8px 0 16px;
}
.btn-add-row:hover {
    border-color: var(--color-accent);
    color: var(--color-accent-light);
    background: rgba(35,134,54,0.05);
}
.batch-add-row {
    display: flex;
    justify-content: center;
}
.batch-log {
    margin-top: 16px;
    padding: 16px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    max-height: 300px;
    overflow-y: auto;
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
}
.batch-log .log-success { color: var(--color-accent-light); }
.batch-log .log-error { color: #f85149; }
.batch-log .log-info { color: #f0883e; }

/* ========== 上传提示 ========== */
.upload-tip {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 12px 16px;
    margin-bottom: 16px;
    border-radius: 8px;
    background: rgba(210,153,34,0.08);
    border: 1px solid rgba(210,153,34,0.25);
    color: #d29922;
    font-size: 0.82rem;
    line-height: 1.6;
}
.upload-tip svg {
    flex-shrink: 0;
    margin-top: 2px;
}

.usage-tip {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 10px 14px;
    margin-bottom: 12px;
    border-radius: 8px;
    background: rgba(56,139,253,0.08);
    border: 1px solid rgba(56,139,253,0.25);
    color: #58a6ff;
    font-size: 13px;
    line-height: 1.5;
}
.usage-tip svg {
    flex-shrink: 0;
    margin-top: 2px;
}

/* ========== 用户导航栏 ========== */
.nav-user {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 16px;
}
.btn-nav-login {
    padding: 6px 18px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-accent);
    background: transparent;
    color: var(--color-accent-light);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-sans);
}
.btn-nav-login:hover {
    background: var(--color-accent);
    color: #fff;
}
.nav-user-info {
    display: flex;
    align-items: center;
    gap: 8px;
}
.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
}
.user-name {
    color: var(--color-text-primary);
    font-size: 0.85rem;
    font-weight: 500;
}
.vip-badge {
    padding: 1px 8px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, #d29922, #f0883e);
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}
.btn-nav-logout {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    transition: var(--transition-fast);
}
.btn-nav-logout:hover {
    color: var(--color-danger);
}

/* ========== 弹窗 ========== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.modal-box {
    background: #161b22;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 36px 32px;
    width: 380px;
    max-width: 90vw;
    position: relative;
    box-shadow: 0 16px 48px rgba(0,0,0,0.5);
    animation: slideUp 0.25s ease;
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.modal-close {
    position: absolute;
    top: 14px;
    right: 14px;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
    transition: var(--transition-fast);
}
.modal-close:hover { color: var(--color-text-primary); }
.modal-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--color-border);
}
.modal-tab {
    flex: 1;
    padding: 10px 0;
    text-align: center;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: -2px;
    transition: var(--transition-fast);
    font-family: var(--font-sans);
}
.modal-tab.active {
    color: var(--color-accent-light);
    border-bottom-color: var(--color-accent);
}
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
}
.form-group input {
    width: 100%;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    background: rgba(0,0,0,0.3);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    transition: var(--transition-fast);
}
.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(35,134,54,0.2);
}
.form-error {
    padding: 8px 12px;
    border-radius: 6px;
    background: rgba(248,81,73,0.1);
    border: 1px solid rgba(248,81,73,0.3);
    color: #f85149;
    font-size: 0.8rem;
    margin-bottom: 12px;
}
.btn-auth-submit {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: none;
    background: linear-gradient(135deg, var(--color-accent), #2ea043);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-sans);
}
.btn-auth-submit:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}
.btn-vip {
    background: linear-gradient(135deg, #d29922, #f0883e);
}
.modal-header-icon {
    text-align: center;
    margin-bottom: 12px;
}
.modal-title {
    text-align: center;
    font-size: 1.2rem;
    color: var(--color-text-primary);
    margin-bottom: 6px;
}
.modal-desc {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

/* ========== VIP 套餐卡片 ========== */
.modal-box-wide {
    width: 480px;
}
.vip-plans {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}
.vip-plan {
    position: relative;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 16px 8px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
    background: rgba(0,0,0,0.2);
}
.vip-plan:hover {
    border-color: #d29922;
    background: rgba(210,153,34,0.05);
}
.vip-plan.selected {
    border-color: #d29922;
    background: rgba(210,153,34,0.12);
    box-shadow: 0 0 0 2px rgba(210,153,34,0.3);
}
.plan-tag {
    position: absolute;
    top: -9px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #d29922, #f0883e);
    color: #fff;
    font-size: 0.6rem;
    font-weight: 700;
    padding: 1px 10px;
    border-radius: 10px;
    white-space: nowrap;
}
.plan-duration {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 6px;
}
.plan-price {
    font-size: 1.3rem;
    font-weight: 800;
    color: #d29922;
    margin-bottom: 4px;
}
.price-symbol {
    font-size: 0.8rem;
    font-weight: 600;
}
.plan-unit {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}
.plan-discount {
    color: #f0883e;
    font-weight: 600;
}
/* ========== 安全声明 ========== */
.security-notice {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
    padding: 10px 16px;
    color: #4caf50;
    font-size: 0.8rem;
    font-weight: 500;
}
.security-notice svg {
    flex-shrink: 0;
}

/* ========== 支付按钮 ========== */
.pay-section {
    margin-bottom: 16px;
}
.pay-buttons {
    display: flex;
    gap: 12px;
}
.btn-pay {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-sans);
    transition: var(--transition-fast);
}
.btn-pay:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.btn-pay-alipay {
    background: rgba(0, 130, 236, 0.1);
    color: #1677ff;
    border-color: rgba(0, 130, 236, 0.3);
}
.btn-pay-alipay:hover:not(:disabled) {
    background: rgba(0, 130, 236, 0.2);
    border-color: #1677ff;
}
.btn-pay-wechat {
    background: rgba(7, 193, 96, 0.1);
    color: #07c160;
    border-color: rgba(7, 193, 96, 0.3);
}
.btn-pay-wechat:hover:not(:disabled) {
    background: rgba(7, 193, 96, 0.2);
    border-color: #07c160;
}

.vip-activate-section {
    border-top: 1px solid var(--color-border);
    padding-top: 16px;
}
.vip-activate-hint {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-bottom: 10px;
    text-align: center;
}
.vip-activate-form {
    display: flex;
    gap: 10px;
}
.vip-activate-form input {
    flex: 1;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    background: rgba(0,0,0,0.3);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    font-family: var(--font-sans);
}
.vip-activate-form input:focus {
    outline: none;
    border-color: #d29922;
    box-shadow: 0 0 0 3px rgba(210,153,34,0.2);
}
.vip-activate-form .btn-vip {
    width: auto;
    padding: 10px 24px;
    white-space: nowrap;
    flex-shrink: 0;
}
.vip-current-status {
    margin-top: 12px;
    padding: 10px 14px;
    border-radius: 8px;
    background: rgba(46,160,67,0.08);
    border: 1px solid rgba(46,160,67,0.2);
    color: var(--color-accent-light);
    font-size: 0.8rem;
    text-align: center;
}

/* ========== VIP 锁定覆盖 ========== */
.vip-lock-overlay {
    position: relative;
}
.vip-lock-mask {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(13,17,23,0.85);
    backdrop-filter: blur(4px);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    cursor: pointer;
    transition: var(--transition-fast);
}
.vip-lock-mask:hover {
    background: rgba(13,17,23,0.75);
}
.vip-lock-icon {
    color: #d29922;
    margin-bottom: 8px;
}
.vip-lock-text {
    color: #d29922;
    font-size: 0.9rem;
    font-weight: 600;
}
.vip-lock-hint {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    margin-top: 4px;
}


/* SEO 内容：对爬虫可见，对用户隐藏（不要用 display:none，否则爬虫会忽略） */
.seo-content {
    position: absolute;
    left: -9999px;
    top: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}