/* ===========================
   CSS Variables & Design System
   =========================== */
:root {
    /* Color Palette - Vibrant Gradients */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --accent-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);

    /* Solid Colors */
    --bg-dark: #0f0f23;
    --bg-card: #1a1a2e;
    --bg-input: #16162a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --text-muted: #6b6b8f;
    --border-color: rgba(102, 126, 234, 0.2);
    --border-hover: rgba(102, 126, 234, 0.4);

    /* Status Colors */
    --success: #43e97b;
    --warning: #ffd93d;
    --error: #f5576c;
    --info: #4facfe;

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

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ===========================
   Reset & Base Styles
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ===========================
   Background Effects
   =========================== */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(67, 233, 123, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

/* ===========================
   Container & Layout
   =========================== */
.container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===========================
   Header
   =========================== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.6s ease;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: #667eea;
    filter: drop-shadow(0 0 20px rgba(102, 126, 234, 0.5));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

.header h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
    margin-top: var(--spacing-xs);
}

/* ===========================
   Main Content
   =========================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ===========================
   Cards
   =========================== */
.comparison-card,
.results-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    animation: fadeInUp 0.6s ease;
}

.comparison-card:hover,
.results-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header,
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.card-header h2,
.results-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===========================
   Status Indicator
   =========================== */
.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(67, 233, 123, 0.1);
    border-radius: var(--radius-full);
    border: 1px solid rgba(67, 233, 123, 0.3);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.2);
    }
}

.status-text {
    font-size: 0.875rem;
    color: var(--success);
    font-weight: 500;
}

/* ===========================
   Form Styles
   =========================== */
.comparison-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-wrapper {
    position: relative;
}

.input-wrapper input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3.5rem;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-base);
    outline: none;
}

.input-wrapper input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

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

.input-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    pointer-events: none;
    transition: color var(--transition-base);
}

.input-wrapper input:focus+.input-icon {
    color: #667eea;
}

/* ===========================
   VS Divider
   =========================== */
.vs-divider {
    position: relative;
    text-align: center;
    margin: var(--spacing-sm) 0;
}

.vs-text {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--secondary-gradient);
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    animation: scaleIn 0.6s ease 0.3s both;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===========================
   Buttons
   =========================== */
.compare-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.compare-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.compare-button:hover::before {
    left: 100%;
}

.compare-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.compare-button:active {
    transform: translateY(0);
}

.button-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-base);
}

.compare-button:hover .button-icon {
    transform: translateX(4px);
}

.reset-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-base);
}

.reset-button svg {
    width: 16px;
    height: 16px;
}

.reset-button:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

/* ===========================
   Results Card
   =========================== */
.results-card {
    display: none;
}

.results-card.visible {
    display: block;
    animation: fadeInUp 0.6s ease;
}

/* ===========================
   Score Display
   =========================== */
.score-display {
    display: flex;
    justify-content: center;
    margin: var(--spacing-xl) 0;
}

.score-circle {
    position: relative;
    width: 200px;
    height: 200px;
}

.score-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.score-ring-background {
    fill: none;
    stroke: var(--bg-input);
    stroke-width: 12;
}

.score-ring-progress {
    fill: none;
    stroke: url(#scoreGradient);
    stroke-width: 12;
    stroke-linecap: round;
    stroke-dasharray: 534;
    stroke-dashoffset: 534;
    transition: stroke-dashoffset 1s ease;
}

.score-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.score-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 3rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.score-percent {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-left: 4px;
}

/* ===========================
   Comparison Details
   =========================== */
.comparison-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-sm);
    transition: background var(--transition-base);
}

.detail-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.detail-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.detail-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.detail-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-badge.excellent {
    background: rgba(67, 233, 123, 0.2);
    color: var(--success);
    border: 1px solid rgba(67, 233, 123, 0.4);
}

.detail-badge.good {
    background: rgba(74, 172, 254, 0.2);
    color: var(--info);
    border: 1px solid rgba(74, 172, 254, 0.4);
}

.detail-badge.fair {
    background: rgba(255, 217, 61, 0.2);
    color: var(--warning);
    border: 1px solid rgba(255, 217, 61, 0.4);
}

.detail-badge.poor {
    background: rgba(245, 87, 108, 0.2);
    color: var(--error);
    border: 1px solid rgba(245, 87, 108, 0.4);
}

/* ===========================
   Batch Comparison Card
   =========================== */
.batch-card,
.batch-results-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.batch-card:hover,
.batch-results-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.batch-results-card {
    display: none;
}

.batch-results-card.visible {
    display: block;
    animation: fadeInUp 0.6s ease;
}

/* ===========================
   Upload Section
   =========================== */
.upload-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.upload-area {
    position: relative;
    padding: var(--spacing-xl);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.02);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

.upload-area:hover {
    border-color: var(--border-hover);
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-2px);
}

.upload-area.drag-over {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

.upload-area:hover .upload-icon {
    color: #667eea;
    transform: translateY(-4px);
}

.upload-area h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.file-format {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
}

/* ===========================
   CSV Info
   =========================== */
.csv-info {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.csv-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.csv-info ul {
    list-style: none;
    padding: 0;
}

.csv-info li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.csv-info li::before {
    content: '•';
    color: #667eea;
    font-weight: bold;
    font-size: 1.25rem;
}

.csv-info code {
    padding: 2px 8px;
    background: var(--bg-input);
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: #667eea;
}

/* ===========================
   Progress Bar
   =========================== */
.batch-progress {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

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

.progress-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.progress-count {
    font-size: 0.875rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
}

.progress-bar-container {
    height: 8px;
    background: var(--bg-input);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
    width: 0%;
}

/* ===========================
   Batch Actions
   =========================== */
.batch-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.download-template-button,
.export-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.download-template-button svg,
.export-button svg {
    width: 16px;
    height: 16px;
}

.download-template-button:hover,
.export-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===========================
   Batch Statistics
   =========================== */
.batch-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===========================
   Results Table
   =========================== */
.results-table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.results-table thead {
    background: rgba(255, 255, 255, 0.05);
}

.results-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.results-table td {
    padding: var(--spacing-md);
    color: var(--text-primary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.results-table tbody tr {
    transition: background var(--transition-base);
}

.results-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

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

.results-table .row-number {
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.results-table .score-cell {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 1rem;
}

.results-table .quality-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.results-table .quality-badge.excellent {
    background: rgba(67, 233, 123, 0.2);
    color: var(--success);
}

.results-table .quality-badge.good {
    background: rgba(74, 172, 254, 0.2);
    color: var(--info);
}

.results-table .quality-badge.fair {
    background: rgba(255, 217, 61, 0.2);
    color: var(--warning);
}

.results-table .quality-badge.poor {
    background: rgba(245, 87, 108, 0.2);
    color: var(--error);
}

/* ===========================
   Footer
   =========================== */
.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: auto;
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .header h1 {
        font-size: 1.75rem;
    }

    .logo-icon {
        width: 36px;
        height: 36px;
    }

    .comparison-card,
    .results-card {
        padding: var(--spacing-md);
    }

    .score-circle {
        width: 160px;
        height: 160px;
    }

    .score-number {
        font-size: 2.5rem;
    }

    .score-percent {
        font-size: 1.25rem;
    }

    .detail-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}

@media (max-width: 480px) {

    .card-header,
    .results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .reset-button {
        align-self: flex-end;
    }
}