:root {
    --bg-color: #e0f7fa;
    --card-bg: rgba(255, 255, 255, 0.90);
    --border-color: rgba(26, 75, 140, 0.15);
    --primary: #1a4b8c;
    --primary-hover: #123666;
    --secondary: #0cabc4;
    --accent: #f09201;
    --success: #0cabc4; 
    --danger: #f09201; 
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --glass-shadow: 0 8px 32px rgba(26, 75, 140, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Myriad Pro', Myriad, 'Segoe UI', Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.88)),
        url('background.jpg');
    background-size: cover;
    background-attachment: fixed;
    background-position: center center;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    text-align: center;
    margin-bottom: 1rem;
    position: relative;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

header p {
    color: var(--text-muted);
}

.upload-section {
    display: flex;
    gap: 2rem;
    justify-content: space-between;
}

@media (max-width: 768px) {
    .upload-section {
        flex-direction: column;
    }
}

.drop-zone {
    flex: 1;
    background: var(--card-bg);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary);
    background: rgba(26, 75, 140, 0.02);
    transform: translateY(-2px);
}

.drop-zone .icon {
    font-size: 3rem;
    color: var(--secondary);
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.drop-zone:hover .icon {
    transform: scale(1.1);
}

.drop-zone h3 {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary);
}

.drop-zone p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.file-name {
    display: block;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
    word-break: break-all;
    margin-top: 0.5rem;
}

.controls {
    display: flex;
    justify-content: center;
    margin: 1rem 0;
}

.btn {
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.btn.primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 15px rgba(26, 75, 140, 0.2);
}

.btn.primary:not(:disabled):hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 75, 140, 0.3);
}

.btn:disabled {
    background: #e2e8f0;
    color: #94a3b8;
    cursor: not-allowed;
    box-shadow: none;
}

.btn.sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    border-radius: 6px;
}

.btn.secondary {
    background: var(--secondary);
    color: white;
    box-shadow: 0 4px 15px rgba(12, 171, 196, 0.2);
}

.btn.secondary:hover {
    background: #0a90a4;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(12, 171, 196, 0.3);
}

.results-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.results-container.hidden {
    display: none;
    opacity: 0;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.card.added .card-icon {
    background: rgba(12, 171, 196, 0.1);
    color: var(--secondary);
}

.card.removed .card-icon {
    background: rgba(240, 146, 1, 0.1);
    color: var(--accent);
}

.card.unchanged .card-icon {
    background: rgba(26, 75, 140, 0.05);
    color: var(--primary);
}

.card-info h4 {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.card-info span {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.details-section {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.list-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.list-header h3 {
    margin-bottom: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    color: var(--primary);
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.95rem;
    background: rgba(26, 75, 140, 0.03);
    white-space: nowrap;
}

tbody tr {
    transition: background 0.2s ease;
}

tbody tr:hover {
    background: rgba(12, 171, 196, 0.03);
}

.empty-message {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-style: italic;
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer strong {
    color: var(--primary);
    font-weight: 600;
}

.site-logo {
    position: absolute;
    left: 0;
    top: -10px;
    max-width: 90px;
    height: auto;
}

.footer-logo {
    max-width: 60px;
    height: auto;
    margin: 0 auto 1rem auto;
    display: block;
    opacity: 0.8;
}