:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --success-hover: #059669;
    --border: #334155;
    --danger: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    padding: 2rem;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 600px;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

header h1 {
    font-size: 1.75rem;
    color: var(--text-primary);
}

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

.card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border);
}

.card h2 {
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

/* Upload Section */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: 0.5rem;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 1.5rem;
    background-color: rgba(15, 23, 42, 0.5);
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary);
    background-color: rgba(59, 130, 246, 0.05);
}

.upload-icon {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.browse-btn {
    color: var(--primary);
    text-decoration: underline;
    font-weight: 500;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background-color: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
}

.file-info span {
    flex-grow: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.25rem;
}

.icon-btn:hover {
    color: var(--danger);
    background-color: rgba(239, 68, 68, 0.1);
}

/* Buttons */
button {
    width: 100%;
    padding: 0.875rem;
    border-radius: 0.5rem;
    border: none;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.primary-btn {
    background-color: var(--primary);
    color: white;
}

.primary-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.success-btn {
    background-color: var(--success);
    color: white;
    margin-top: 1.5rem;
    animation: pulse 2s infinite;
}

.success-btn:hover {
    background-color: var(--success-hover);
    animation: none;
}

.secondary-btn {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    margin-top: 1rem;
}

.secondary-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

/* Progress Section */
.progress-container {
    margin-bottom: 1.5rem;
}

.progress-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.progress-bar-bg {
    width: 100%;
    height: 8px;
    background-color: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary);
    width: 0%;
    transition: width 0.3s ease;
}

.status-msg {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.log-container {
    background-color: #0f172a;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    height: 400px;
    overflow-y: auto;
    font-family: monospace;
    font-size: 0.85rem;
}

.log-item {
    margin-bottom: 0.5rem;
    display: flex;
    gap: 0.5rem;
}

.log-time {
    color: var(--text-secondary);
}

.log-success { color: var(--success); }
.log-error { color: var(--danger); }
.log-info { color: var(--primary); }

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

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