:root {
    --bg-color: #0a0a0c;
    --card-bg: rgba(255, 255, 255, 0.03);
    --border-color: rgba(255, 255, 255, 0.08);
    --accent-color: #ffffff;
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
    --error-color: #ff4d4d;
    --success-color: #4df3a9;
    --font-main: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
}

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

header {
    margin-bottom: 40px;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

main {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 32px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    transition: all 0.3s ease;
    animation: fadeIn 1s ease-out;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 40px 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.01);
    position: relative;
    pointer-events: auto;
}

.drop-zone * {
    pointer-events: none;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.04);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    pointer-events: none;
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.drop-zone:hover .upload-icon {
    transform: translateY(-5px);
    color: var(--accent-color);
}

.file-list {
    margin-top: 32px;
    text-align: left;
}

.file-list h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding-left: 4px;
}

#files-container {
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 24px;
}

#files-container::-webkit-scrollbar {
    width: 4px;
}

#files-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}

.file-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 12px;
    margin-bottom: 8px;
    font-size: 0.85rem;
    border: 1px solid transparent;
    transition: background 0.2s ease;
}

.file-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.file-name {
    text-align: center;
    word-break: break-word;
    margin-bottom: 6px;
    padding: 0 10px;
    width: 100%;
}

.actions {
    display: flex;
    gap: 12px;
}

.primary-btn {
    flex: 1;
    background: var(--accent-color);
    color: var(--bg-color);
    border: none;
    padding: 14px 24px;
    border-radius: 12px;
    font-weight: 600;
    font-family: var(--font-main);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.95rem;
}

.primary-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.primary-btn:active {
    transform: scale(0.98);
}

.secondary-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 14px 24px;
    border-radius: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.secondary-btn:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.hidden {
    display: none !important;
}

.status-container {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.loader {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.progress-bar-container {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
}

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

footer {
    margin-top: 40px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    opacity: 0.5;
}

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Custom styles for conversion success */
.success-msg {
    color: var(--success-color);
    font-weight: 500;
    margin-top: 10px;
}