/* ═══════════════════════════════════════════════════════════
   PDFax — Unified Design System
   All-in-one PDF Accessibility Toolkit
   ═══════════════════════════════════════════════════════════ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ══════════════════════════════════════
   1. DESIGN TOKENS (CSS Custom Properties)
   ══════════════════════════════════════ */
:root {
    /* ── Background Layers ── */
    --bg-base:        #0B1120;
    --bg-surface:     #111827;
    --bg-elevated:    #1A2332;
    --bg-sidebar:     #0D1526;
    --bg-topbar:      #0F172A;
    --bg-statusbar:   #080E1A;

    /* ── Primary Accent ── */
    --accent-primary:      #3B82F6;
    --accent-hover:        #60A5FA;
    --accent-glow:         rgba(59, 130, 246, 0.12);
    --accent-glow-strong:  rgba(59, 130, 246, 0.25);

    /* ── Tool-Specific Accents ── */
    --tool-injection:       #8B5CF6;
    --tool-injection-hover: #A78BFA;
    --tool-injection-glow:  rgba(139, 92, 246, 0.15);
    --tool-injection-bg:    rgba(139, 92, 246, 0.08);

    --tool-extractor:       #06B6D4;
    --tool-extractor-hover: #22D3EE;
    --tool-extractor-glow:  rgba(6, 182, 212, 0.15);
    --tool-extractor-bg:    rgba(6, 182, 212, 0.08);

    --tool-originality:       #F59E0B;
    --tool-originality-hover: #FBBF24;
    --tool-originality-glow:  rgba(245, 158, 11, 0.15);
    --tool-originality-bg:    rgba(245, 158, 11, 0.08);

    /* ── Text ── */
    --text-primary:    #F1F5F9;
    --text-secondary:  #94A3B8;
    --text-muted:      #64748B;
    --text-disabled:   #475569;

    /* ── Semantic ── */
    --success:         #10B981;
    --success-bg:      rgba(16, 185, 129, 0.12);
    --warning:         #F59E0B;
    --warning-bg:      rgba(245, 158, 11, 0.12);
    --danger:          #EF4444;
    --danger-bg:       rgba(239, 68, 68, 0.12);
    --info:            #3B82F6;
    --info-bg:         rgba(59, 130, 246, 0.12);

    /* ── Borders ── */
    --border-subtle:   #1E293B;
    --border-active:   #334155;
    --border-focus:    var(--accent-primary);

    /* ── Glassmorphism ── */
    --glass-bg:        rgba(17, 24, 39, 0.70);
    --glass-border:    rgba(30, 41, 59, 0.50);
    --glass-blur:      12px;

    /* ── Shadows ── */
    --shadow-sm:   0 1px 2px rgba(0, 0, 0, 0.25);
    --shadow-md:   0 4px 12px rgba(0, 0, 0, 0.30);
    --shadow-lg:   0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 20px var(--accent-glow);

    /* ── Layout ── */
    --topbar-h:    56px;
    --sidebar-w:   72px;
    --statusbar-h: 30px;

    /* ── Typography ── */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono:    'JetBrains Mono', 'Cascadia Code', 'Consolas', monospace;

    /* ── Transitions ── */
    --ease-out:   cubic-bezier(0.0, 0.0, 0.2, 1);
    --ease-in:    cubic-bezier(0.4, 0.0, 1, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* ── Radii ── */
    --radius-sm:   6px;
    --radius-md:   10px;
    --radius-lg:   14px;
    --radius-xl:   20px;
    --radius-pill: 999px;
}

/* ══════════════════════════════════════
   2. RESET & BASE
   ══════════════════════════════════════ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-base);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

a { color: var(--accent-primary); text-decoration: none; }
a:hover { color: var(--accent-hover); }

::selection {
    background: var(--accent-glow-strong);
    color: var(--text-primary);
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--border-active);
    border-radius: var(--radius-pill);
}
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ══════════════════════════════════════
   3. APP SHELL LAYOUT
   ══════════════════════════════════════ */
.app-shell {
    display: grid;
    grid-template-rows: var(--topbar-h) 1fr var(--statusbar-h);
    grid-template-columns: var(--sidebar-w) 1fr;
    grid-template-areas:
        "topbar  topbar"
        "sidebar content"
        "sidebar statusbar";
    height: 100vh;
    width: 100vw;
}

/* ══════════════════════════════════════
   4. TOP BAR
   ══════════════════════════════════════ */
.topbar {
    grid-area: topbar;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    background: var(--bg-topbar);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 100;
    position: relative;
}

/* Subtle accent glow under topbar */
.topbar::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--accent-primary) 30%,
        var(--accent-hover) 50%,
        var(--accent-primary) 70%,
        transparent 100%
    );
    opacity: 0.3;
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    user-select: none;
}

.topbar-logo {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent-primary), #6366F1);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
    transition: transform 0.2s var(--ease-smooth), box-shadow 0.2s var(--ease-smooth);
}

.topbar-brand:hover .topbar-logo {
    transform: scale(1.08);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
}

.topbar-logo svg {
    width: 18px;
    height: 18px;
    color: #fff;
}

.topbar-title {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.topbar-title h1 {
    font-size: 17px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.topbar-title span {
    font-size: 11px;
    font-weight: 400;
    color: var(--text-muted);
    margin-top: 2px;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.topbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.15s var(--ease-smooth);
}

.topbar-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.topbar-btn svg { width: 18px; height: 18px; }

/* ══════════════════════════════════════
   5. SIDEBAR RAIL
   ══════════════════════════════════════ */
.sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 0;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-subtle);
    gap: 4px;
    z-index: 90;
    position: relative;
}

/* Active indicator slider (animated) */
.sidebar-indicator {
    position: absolute;
    left: 0;
    width: 3px;
    height: 40px;
    background: var(--accent-primary);
    border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
    transition: top 0.3s var(--ease-smooth), background-color 0.3s var(--ease-smooth);
    opacity: 0;
    box-shadow: 0 0 8px var(--accent-glow);
}

.sidebar-indicator.visible {
    opacity: 1;
}

.sidebar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s var(--ease-smooth);
    position: relative;
    gap: 4px;
    -webkit-user-select: none;
    user-select: none;
}

.sidebar-item svg {
    width: 22px;
    height: 22px;
    transition: transform 0.2s var(--ease-smooth);
    flex-shrink: 0;
}

.sidebar-item .sidebar-label {
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.3px;
    text-transform: uppercase;
    white-space: nowrap;
    opacity: 0.7;
    transition: opacity 0.2s var(--ease-smooth);
}

/* Hover */
.sidebar-item:hover {
    background: var(--bg-elevated);
    color: var(--text-secondary);
}

.sidebar-item:hover svg {
    transform: scale(1.1);
}

.sidebar-item:hover .sidebar-label {
    opacity: 1;
}

/* Active states per tool */
.sidebar-item.active {
    color: var(--text-primary);
}

.sidebar-item.active .sidebar-label {
    opacity: 1;
}

.sidebar-item[data-tool="injection"].active {
    color: var(--tool-injection);
    background: var(--tool-injection-bg);
}

.sidebar-item[data-tool="extractor"].active {
    color: var(--tool-extractor);
    background: var(--tool-extractor-bg);
}

.sidebar-item[data-tool="originality"].active {
    color: var(--tool-originality);
    background: var(--tool-originality-bg);
}

/* Glow behind active icon */
.sidebar-item.active::before {
    content: '';
    position: absolute;
    inset: 4px;
    border-radius: var(--radius-md);
    opacity: 0.4;
    filter: blur(8px);
    z-index: -1;
    transition: opacity 0.3s;
}

.sidebar-item[data-tool="injection"].active::before {
    background: var(--tool-injection);
}

.sidebar-item[data-tool="extractor"].active::before {
    background: var(--tool-extractor);
}

.sidebar-item[data-tool="originality"].active::before {
    background: var(--tool-originality);
}

/* Tooltip */
.sidebar-item .sidebar-tooltip {
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%) translateX(-4px);
    padding: 6px 12px;
    background: var(--bg-elevated);
    color: var(--text-primary);
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-active);
    box-shadow: var(--shadow-md);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s var(--ease-smooth), transform 0.15s var(--ease-smooth);
    z-index: 200;
}

.sidebar-item:hover .sidebar-tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

/* Divider */
.sidebar-divider {
    width: 32px;
    height: 1px;
    background: var(--border-subtle);
    margin: 8px 0;
}

/* Home button (in sidebar) */
.sidebar-home {
    margin-bottom: 4px;
}

/* ══════════════════════════════════════
   6. MAIN CONTENT AREA
   ══════════════════════════════════════ */
.content-area {
    grid-area: content;
    overflow: hidden;
    position: relative;
    background: var(--bg-base);
}

/* Tool panels */
.tool-panel {
    position: absolute;
    inset: 0;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 28px 32px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(20px);
    transition:
        opacity 0.3s var(--ease-smooth),
        transform 0.3s var(--ease-smooth),
        visibility 0s 0.3s;
}

.tool-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
    transition:
        opacity 0.3s var(--ease-smooth) 0.05s,
        transform 0.3s var(--ease-smooth) 0.05s,
        visibility 0s;
}

/* ══════════════════════════════════════
   7. STATUS BAR
   ══════════════════════════════════════ */
.statusbar {
    grid-area: statusbar;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    background: var(--bg-statusbar);
    border-top: 1px solid var(--border-subtle);
    font-size: 11px;
    color: var(--text-muted);
    z-index: 80;
    position: relative;
    overflow: hidden;
}

/* Top-edge progress bar */
.statusbar-progress {
    position: absolute;
    top: 0;
    left: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-hover));
    border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
    width: 0%;
    transition: width 0.4s var(--ease-smooth);
}

.statusbar-progress.shimmer {
    background: linear-gradient(90deg,
        var(--accent-primary) 0%,
        var(--accent-hover) 50%,
        var(--accent-primary) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 2s linear infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.statusbar-left,
.statusbar-center,
.statusbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.statusbar-left { flex: 0 0 auto; }
.statusbar-center { flex: 1; justify-content: center; }
.statusbar-right { flex: 0 0 auto; }

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
    transition: background 0.3s, box-shadow 0.3s;
}

.status-dot.processing {
    background: var(--warning);
    box-shadow: 0 0 6px var(--warning);
    animation: pulse-dot 1.5s ease-in-out infinite;
}

.status-dot.error {
    background: var(--danger);
    box-shadow: 0 0 6px var(--danger);
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ══════════════════════════════════════
   8. WELCOME / HOME SCREEN
   ══════════════════════════════════════ */
.welcome-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    padding: 40px;
}

.welcome-header {
    text-align: center;
    margin-bottom: 48px;
    animation: fadeInUp 0.6s var(--ease-smooth);
}

.welcome-header h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.welcome-header p {
    font-size: 15px;
    color: var(--text-secondary);
    max-width: 440px;
    line-height: 1.6;
}

.welcome-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    width: 100%;
}

.welcome-card {
    position: relative;
    padding: 32px 28px;
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    cursor: pointer;
    transition: all 0.3s var(--ease-smooth);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    overflow: hidden;
}

.welcome-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, transparent, transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s var(--ease-smooth);
}

.welcome-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.welcome-card:hover::before {
    opacity: 1;
}

/* Tool-specific card accents */
.welcome-card[data-tool="injection"]:hover {
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.2);
}
.welcome-card[data-tool="injection"]::before {
    background: linear-gradient(135deg, var(--tool-injection), transparent 60%);
}
.welcome-card[data-tool="injection"]:hover::before { opacity: 1; }

.welcome-card[data-tool="extractor"]:hover {
    box-shadow: 0 8px 32px rgba(6, 182, 212, 0.2);
}
.welcome-card[data-tool="extractor"]::before {
    background: linear-gradient(135deg, var(--tool-extractor), transparent 60%);
}

.welcome-card[data-tool="originality"]:hover {
    box-shadow: 0 8px 32px rgba(245, 158, 11, 0.2);
}
.welcome-card[data-tool="originality"]::before {
    background: linear-gradient(135deg, var(--tool-originality), transparent 60%);
}

.welcome-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s var(--ease-spring);
}

.welcome-card:hover .welcome-card-icon {
    transform: scale(1.1);
}

.welcome-card[data-tool="injection"] .welcome-card-icon {
    background: var(--tool-injection-bg);
    color: var(--tool-injection);
    box-shadow: 0 0 20px var(--tool-injection-glow);
}

.welcome-card[data-tool="extractor"] .welcome-card-icon {
    background: var(--tool-extractor-bg);
    color: var(--tool-extractor);
    box-shadow: 0 0 20px var(--tool-extractor-glow);
}

.welcome-card[data-tool="originality"] .welcome-card-icon {
    background: var(--tool-originality-bg);
    color: var(--tool-originality);
    box-shadow: 0 0 20px var(--tool-originality-glow);
}

.welcome-card-icon svg {
    width: 28px;
    height: 28px;
}

.welcome-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.welcome-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.55;
}

.welcome-card-arrow {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 4px;
    transition: color 0.2s, gap 0.2s;
}

.welcome-card:hover .welcome-card-arrow {
    gap: 10px;
}

.welcome-card[data-tool="injection"]:hover .welcome-card-arrow { color: var(--tool-injection); }
.welcome-card[data-tool="extractor"]:hover .welcome-card-arrow { color: var(--tool-extractor); }
.welcome-card[data-tool="originality"]:hover .welcome-card-arrow { color: var(--tool-originality); }

.welcome-card-arrow svg { width: 14px; height: 14px; }

/* Staggered card entrance animation */
.welcome-card:nth-child(1) { animation: fadeInUp 0.5s var(--ease-smooth) 0.1s both; }
.welcome-card:nth-child(2) { animation: fadeInUp 0.5s var(--ease-smooth) 0.2s both; }
.welcome-card:nth-child(3) { animation: fadeInUp 0.5s var(--ease-smooth) 0.3s both; }

.welcome-hint {
    margin-top: 40px;
    font-size: 13px;
    color: var(--text-muted);
    animation: fadeInUp 0.5s var(--ease-smooth) 0.5s both;
}

.welcome-hint kbd {
    display: inline-block;
    padding: 2px 8px;
    margin: 0 2px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-secondary);
    background: var(--bg-elevated);
    border: 1px solid var(--border-active);
    border-radius: 4px;
}

/* ══════════════════════════════════════
   9. SHARED TOOL PANEL COMPONENTS
   ══════════════════════════════════════ */

/* Panel header */
.panel-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.panel-header-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.panel-header h2 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.panel-header p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* Step cards */
.step-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
    transition: border-color 0.2s;
}

.step-card:hover {
    border-color: var(--border-active);
}

.step-card-accent {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    border-radius: var(--radius-pill);
}

.step-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.step-badge {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.5px;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    text-transform: uppercase;
}

.step-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Pill toggle (Single / Batch) */
.pill-toggle {
    display: inline-flex;
    background: var(--bg-base);
    border-radius: var(--radius-pill);
    padding: 3px;
    border: 1px solid var(--border-subtle);
    gap: 2px;
}

.pill-toggle-btn {
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius-pill);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-primary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s var(--ease-smooth);
    position: relative;
}

.pill-toggle-btn:hover:not(.active) {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.pill-toggle-btn.active {
    background: var(--accent-primary);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
}

/* Form fields */
.field-group {
    margin-bottom: 16px;
}

.field-label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.field-row {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.field-input {
    flex: 1;
    height: 42px;
    padding: 0 14px;
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.field-input::placeholder {
    color: var(--text-muted);
}

.field-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.field-input:read-only {
    color: var(--text-secondary);
    cursor: default;
}

/* Checkboxes */
.checkbox-group {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.checkbox-item input[type="checkbox"] {
    display: none;
}

.checkbox-mark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-active);
    border-radius: 5px;
    background: var(--bg-base);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s var(--ease-spring);
    flex-shrink: 0;
}

.checkbox-mark svg {
    width: 12px;
    height: 12px;
    color: #fff;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.2s var(--ease-spring);
}

.checkbox-item input:checked + .checkbox-mark {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.checkbox-item input:checked + .checkbox-mark svg {
    opacity: 1;
    transform: scale(1);
}

.checkbox-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

/* ══════════════════════════════════════
   10. BUTTONS
   ══════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s var(--ease-smooth);
    white-space: nowrap;
    user-select: none;
}

.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.btn-primary {
    background: var(--accent-primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    border-color: var(--border-active);
    background: var(--border-subtle);
}

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

.btn-success:hover {
    background: #34D399;
    transform: translateY(-1px);
}

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

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

.btn-lg {
    height: 46px;
    font-size: 14px;
    font-weight: 700;
    border-radius: var(--radius-lg);
    padding: 0 28px;
}

.btn-sm {
    height: 30px;
    padding: 0 12px;
    font-size: 11px;
    border-radius: var(--radius-sm);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Tool-colored buttons */
.btn-injection {
    background: var(--tool-injection);
    color: #fff;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.2);
}
.btn-injection:hover {
    background: var(--tool-injection-hover);
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.3);
    transform: translateY(-1px);
}

.btn-extractor {
    background: var(--tool-extractor);
    color: #fff;
    box-shadow: 0 2px 8px rgba(6, 182, 212, 0.2);
}
.btn-extractor:hover {
    background: var(--tool-extractor-hover);
    box-shadow: 0 4px 16px rgba(6, 182, 212, 0.3);
    transform: translateY(-1px);
}

.btn-originality {
    background: var(--tool-originality);
    color: #0B1120;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.2);
}
.btn-originality:hover {
    background: var(--tool-originality-hover);
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
    transform: translateY(-1px);
}

/* ══════════════════════════════════════
   11. PROGRESS BAR
   ══════════════════════════════════════ */
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-elevated);
    border-radius: var(--radius-pill);
    overflow: hidden;
    position: relative;
}

.progress-bar-fill {
    height: 100%;
    border-radius: var(--radius-pill);
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-hover));
    width: 0%;
    transition: width 0.4s var(--ease-smooth);
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.15) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: shimmer 2s linear infinite;
}

/* Thicker variant */
.progress-bar.thick { height: 8px; }

/* ══════════════════════════════════════
   12. CONSOLE LOG
   ══════════════════════════════════════ */
.console-container {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.console-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.console-header-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.console-body {
    padding: 12px 16px;
    max-height: 160px;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.7;
    color: var(--text-secondary);
    background: var(--bg-base);
}

.console-line {
    animation: fadeIn 0.2s var(--ease-smooth);
}

.console-line .console-time {
    color: var(--text-muted);
    margin-right: 8px;
}

.console-line.error { color: var(--danger); }
.console-line.success { color: var(--success); }
.console-line.warning { color: var(--warning); }

/* ══════════════════════════════════════
   13. BADGES
   ══════════════════════════════════════ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 11px;
    font-weight: 600;
}

.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger  { background: var(--danger-bg);  color: var(--danger); }
.badge-info    { background: var(--info-bg);    color: var(--info); }

/* ══════════════════════════════════════
   14. DROP ZONE (Upload area)
   ══════════════════════════════════════ */
.drop-zone {
    border: 2px dashed var(--border-active);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s var(--ease-smooth);
    background: transparent;
    position: relative;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: var(--accent-glow);
}

.drop-zone.drag-over {
    transform: scale(1.01);
    box-shadow: 0 0 30px var(--accent-glow);
}

.drop-zone-icon {
    margin-bottom: 16px;
    color: var(--text-muted);
    transition: color 0.2s, transform 0.2s;
}

.drop-zone:hover .drop-zone-icon {
    color: var(--accent-primary);
    transform: translateY(-2px);
}

.drop-zone-icon svg { width: 48px; height: 48px; }

.drop-zone h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.drop-zone p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.drop-zone-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.drop-zone-divider {
    color: var(--text-muted);
    font-size: 12px;
}

/* ══════════════════════════════════════
   15. ORIGINALITY CHECKER LAYOUT
   ══════════════════════════════════════ */
.originality-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-subtle);
    margin: 0 8px;
}

.toolbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 32px;
    padding: 0 12px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    font-family: var(--font-primary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s var(--ease-smooth);
    white-space: nowrap;
}

.toolbar-btn:hover {
    background: var(--border-subtle);
    color: var(--text-primary);
    border-color: var(--border-active);
}

.toolbar-btn.active {
    background: var(--accent-glow);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toolbar-btn svg { width: 14px; height: 14px; }

.viewer-container {
    display: grid;
    grid-template-columns: 1fr 4px 1fr;
    gap: 0;
    height: calc(100vh - var(--topbar-h) - var(--statusbar-h) - 180px);
    min-height: 400px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-subtle);
}

.viewer-panel {
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.viewer-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-subtle);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.viewer-panel-body {
    flex: 1;
    display: block;
    background: var(--bg-base);
    color: var(--text-muted);
    font-size: 14px;
    overflow: auto;
    padding: 24px 16px;
    box-sizing: border-box;
    text-align: center;
}

.viewer-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
}

.page-render-wrapper {
    position: relative;
    display: inline-block;
    text-align: left;
    vertical-align: top;
    margin: 0 auto;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    border-radius: 4px;
    background: #ffffff;
    transition: width 0.12s ease-out;
}

.page-render-wrapper .page-image {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 4px;
}

.viewer-divider {
    background: var(--border-subtle);
    cursor: col-resize;
    transition: background 0.2s;
}

.viewer-divider:hover {
    background: var(--accent-primary);
}

.similarity-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    margin-top: 16px;
}

.similarity-score {
    font-size: 18px;
    font-weight: 700;
}

.similarity-score.high { color: var(--success); }
.similarity-score.medium { color: var(--warning); }
.similarity-score.low { color: var(--danger); }

/* ══════════════════════════════════════
   16. PIPELINE FLOW (Injection)
   ══════════════════════════════════════ */
.pipeline-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    margin-top: 20px;
}

.pipeline-step {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    font-size: 12px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.pipeline-step .step-num {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--tool-injection-bg);
    color: var(--tool-injection);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
}

.pipeline-arrow {
    color: var(--text-muted);
    font-size: 14px;
}

/* ══════════════════════════════════════
   17. ANIMATIONS
   ══════════════════════════════════════ */
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(16px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.92);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

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

/* ══════════════════════════════════════
   18. RESPONSIVE (secondary priority)
   ══════════════════════════════════════ */
@media (max-width: 1199px) {
    .sidebar-item .sidebar-label { display: none; }
    .sidebar-item { width: 48px; height: 48px; }
    :root { --sidebar-w: 60px; }
}

@media (max-width: 899px) {
    .app-shell {
        grid-template-columns: 1fr;
        grid-template-rows: var(--topbar-h) auto 1fr var(--statusbar-h);
        grid-template-areas:
            "topbar"
            "sidebar"
            "content"
            "statusbar";
    }
    .sidebar {
        flex-direction: row;
        padding: 0 12px;
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
        gap: 8px;
        justify-content: center;
    }
    .sidebar-indicator { display: none; }
    .sidebar-item .sidebar-label { display: none; }
    .sidebar-item .sidebar-tooltip { display: none; }
    .welcome-cards {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
    .viewer-container {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 4px 1fr;
    }
    .viewer-divider { cursor: row-resize; }
}

/* ══════════════════════════════════════
   19. UTILITY CLASSES
   ══════════════════════════════════════ */
.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    margin: -1px; padding: 0;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mb-4 { margin-bottom: 16px; }
.gap-3 { gap: 12px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-full { width: 100%; }