:root {
    --bg-gradient: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --primary-color: #00f2fe;
    --primary-hover: #4facfe;
    --text-primary: #ffffff;
    --text-secondary: #b3c5d1;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #4facfe 0%, #00f2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    transition: transform 0.3s ease;
}

.upload-area {
    border: 2px dashed var(--glass-border);
    border-radius: 16px;
    padding: 2.5rem 1rem;
    text-align: center;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(0, 242, 254, 0.05);
}

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

.upload-area h3 {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

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

.btn-select {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn-select:hover {
    background: rgba(255, 255, 255, 0.2);
}

.settings-group {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.setting-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-item label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

select {
    width: 100%;
    padding: 0.8rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: white;
    font-family: inherit;
    font-size: 1rem;
    appearance: none;
    outline: none;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

select:focus {
    border-color: var(--primary-color);
}

select option {
    background: #1e293b;
    color: white;
}

.btn-primary {
    width: 100%;
    background: linear-gradient(to right, #4facfe 0%, #00f2fe 100%);
    border: none;
    padding: 1rem;
    border-radius: 12px;
    color: #0f2027;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: opacity 0.3s ease, transform 0.1s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: inherit;
}

.btn-primary:hover:not(:disabled) {
    opacity: 0.9;
}

.btn-primary:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-primary:disabled {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.3);
    cursor: not-allowed;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(15, 32, 39, 0.3);
    border-top-color: #0f2027;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.hidden {
    display: none !important;
}

#progress-container {
    margin-top: 1.5rem;
    text-align: center;
}

#progress-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

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

@media (max-width: 600px) {
    .settings-group {
        flex-direction: column;
    }
}