:root {
    --main-bg: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --accent: #38bdf8;
    --accent-hover: #7dd3fc;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --success: #4ade80;
    --error: #f87171;
    --glass-border: rgba(255, 255, 255, 0.1);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--main-bg);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.glass-bg {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.2) 0%, transparent 70%);
    filter: blur(100px);
    z-index: -1;
    transform: translate(-50%, -50%);
}

.container {
    width: 90%;
    max-width: 900px;
    height: 80vh;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 30px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

header h1 {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -1px;
    margin: 0;
}

header p {
    color: var(--text-secondary);
    font-size: 16px;
    margin-top: 5px;
}

.settings {
    display: flex;
    gap: 20px;
    background: rgba(0, 0, 0, 0.2);
    padding: 20px;
    border-radius: 16px;
}

.checkbox-group {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
}

.drop-zone {
    flex: 1;
    border: 2px dashed var(--accent);
    border-radius: 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(56, 189, 248, 0.03);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.drop-zone.active {
    background: rgba(56, 189, 248, 0.1);
    transform: scale(0.98);
}

.drop-content {
    text-align: center;
}

.drop-content .icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.file-list {
    display: none;
    flex: 1;
    overflow-y: auto;
    gap: 12px;
}

.file-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.btn-primary {
    background: var(--accent);
    color: var(--main-bg);
    border: none;
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 800;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
    flex: 1;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3);
}

.btn-item {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 12px;
    cursor: pointer;
}

.btn-item.download {
    background: var(--accent);
    color: var(--main-bg);
}

.progress-bar-container {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 15px;
}

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

footer {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-buttons {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn-secondary {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 800;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
    flex: 0 0 auto;
}

.btn-secondary:hover {
    background: rgba(56, 189, 248, 0.1);
    transform: translateY(-2px);
}

.btn-success {
    background: var(--success);
    color: var(--main-bg);
    border: none;
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 800;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
}

.btn-success:hover {
    background: #22c55e;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 222, 128, 0.3);
}

.file-meta {
    font-size: 11px;
    color: var(--text-secondary);
    margin-left: 8px;
    opacity: 0.7;
}

.stats-panel {
    display: flex;
    gap: 16px;
    background: rgba(0, 0, 0, 0.2);
    padding: 16px 20px;
    border-radius: 12px;
    justify-content: space-around;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-value {
    font-size: 18px;
    font-weight: 800;
    color: var(--accent);
}

.stat-label {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}