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

:root {
    --bg-primary: #0f1923;
    --bg-secondary: #1a2634;
    --bg-card: #1e2d3d;
    --text-primary: #e8edf2;
    --text-secondary: #8899aa;
    --accent: #4a9eff;
    --accent-hover: #3a8eef;
    --green: #27ae60;
    --green-bg: rgba(39, 174, 96, 0.15);
    --red: #e74c3c;
    --red-bg: rgba(231, 76, 60, 0.15);
    --amber: #f39c12;
    --amber-bg: rgba(243, 156, 18, 0.15);
    --gray: #5a6a7a;
    --gray-bg: rgba(90, 106, 122, 0.15);
    --border: #2a3a4a;
    --radius: 10px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === Header === */
header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 28px 0;
    text-align: center;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--accent);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 6px;
}

/* === Main === */
main {
    flex: 1;
    padding: 32px 0;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-scan {
    background: var(--green);
    color: #fff;
    width: 100%;
    padding: 14px;
    font-size: 1.05rem;
    margin-top: 16px;
}
.btn-scan:hover { background: #2ecc71; }

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

.btn-explain {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    width: 100%;
    padding: 14px;
    font-size: 1.05rem;
}
.btn-explain:hover { opacity: 0.9; }
.btn-explain:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.3rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
}
.btn-icon:hover { color: var(--red); background: var(--red-bg); }

/* === Drop Zone === */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-secondary);
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(74, 158, 255, 0.05);
}

.drop-zone-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.drop-zone-text {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.drop-zone-hint {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 12px;
}

/* === File Info === */
.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    border-radius: 8px;
    margin-top: 12px;
}

.file-info #file-name {
    flex: 1;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-info #file-size {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* === Progress === */
.progress-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    box-shadow: var(--shadow);
}

.progress-bar-container {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #667eea);
    border-radius: 3px;
    width: 0%;
    transition: width 0.5s ease;
    animation: progress-pulse 2s ease-in-out infinite;
}

@keyframes progress-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.status-text {
    color: var(--text-secondary);
    margin-top: 16px;
    font-size: 0.95rem;
}

/* === Summary Card === */
.summary-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    gap: 20px;
}

.summary-left {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 0;
}

.summary-left h2 {
    font-size: 1.1rem;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.verdict-badge {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.verdict-safe { background: var(--green-bg); color: var(--green); }
.verdict-malicious { background: var(--red-bg); color: var(--red); }
.verdict-suspicious { background: var(--amber-bg); color: var(--amber); }

.summary-right { text-align: right; flex-shrink: 0; }

.detection-ratio {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.1;
}

.detection-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 4px;
}

/* === Stats Bar === */
.stats-section {
    margin-top: 24px;
}

.stats-section h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.stats-bar {
    display: flex;
    height: 12px;
    border-radius: 6px;
    overflow: hidden;
    background: var(--bg-card);
}

.stats-bar .bar-segment {
    height: 100%;
    transition: width 0.5s ease;
}

.bar-malicious { background: var(--red); }
.bar-suspicious { background: var(--amber); }
.bar-harmless { background: var(--green); }
.bar-undetected { background: var(--gray); }

.stats-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 10px;
    font-size: 0.85rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* === Engine Table === */
.engines-section {
    margin-top: 24px;
}

.engines-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.engines-header h3 {
    font-size: 1rem;
    color: var(--text-secondary);
}

.engines-filter {
    display: flex;
    gap: 4px;
}

.filter-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn:hover { border-color: var(--accent); color: var(--text-primary); }
.filter-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.engine-table-wrapper {
    max-height: 400px;
    overflow-y: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

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

.engine-table thead {
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 1;
}

.engine-table th {
    padding: 10px 14px;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
}

.engine-table td {
    padding: 8px 14px;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border);
}

.engine-table tbody tr {
    background: var(--bg-card);
    transition: background 0.15s;
}

.engine-table tbody tr:hover { background: var(--bg-secondary); }

.category-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.cat-malicious { background: var(--red-bg); color: var(--red); }
.cat-suspicious { background: var(--amber-bg); color: var(--amber); }
.cat-harmless { background: var(--green-bg); color: var(--green); }
.cat-undetected { background: var(--gray-bg); color: var(--gray); }

/* === Explanation === */
.explain-section {
    margin-top: 24px;
}

.explanation-box {
    margin-top: 16px;
    background: var(--bg-card);
    border-left: 4px solid #764ba2;
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 20px;
}

.explanation-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #b39ddb;
}

.explanation-icon { font-size: 1.3rem; }

.explanation-text {
    color: var(--text-primary);
    line-height: 1.7;
    white-space: pre-wrap;
}

/* === Error === */
.error-card {
    background: var(--bg-card);
    border-left: 4px solid var(--red);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 24px;
    text-align: center;
}

.error-card h3 { color: var(--red); margin-bottom: 8px; }
.error-card p { color: var(--text-secondary); margin-bottom: 16px; }

/* === Scan Another === */
.scan-another {
    margin-top: 24px;
    text-align: center;
}

/* === Footer === */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 16px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray); }

/* === Responsive === */
@media (max-width: 600px) {
    .summary-card {
        flex-direction: column;
        text-align: center;
    }
    .summary-left { flex-direction: column; }
    .summary-right { text-align: center; }
    .engines-header { flex-direction: column; align-items: flex-start; }
    .detection-ratio { font-size: 1.6rem; }
}

/* === Fade-in Animation === */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

section:not([hidden]) {
    animation: fadeIn 0.3s ease;
}

/* === Spinner for explain button === */
.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}

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