:root {
    --primary-color: #00ff9d;
    --hover-color: #00cc7e;
    --bg-color: #0a0a0a;
    --card-bg: #151515;
    --text-color: #ffffff;
    --text-secondary: #888888;
    --border-color: #222;
    --shadow-color: rgba(0, 255, 157, 0.1);
}

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    background: linear-gradient(135deg, #0a0a0a 0%, #151515 100%);
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2.5rem;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 8px 32px var(--shadow-color);
    border: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    animation: containerFade 0.6s ease-out;
}

@keyframes containerFade {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 0;
    font-size: 3rem;
    letter-spacing: -1px;
    position: relative;
    animation: morphText 10s infinite;
}

@keyframes morphText {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); filter: hue-rotate(30deg); }
    100% { transform: scale(1); }
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-size: 1.1rem;
    opacity: 0.8;
}

.converter-box {
    margin: 3rem 0;
    position: relative;
    min-height: 200px;
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    transition: all 0.3s ease;
    padding: 2rem;
}

.converter-box.drag-over {
    border-color: var(--primary-color);
    background: rgba(0, 255, 157, 0.05);
    transform: scale(1.02);
}

.converter-box::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border-radius: 20px;
    background: linear-gradient(45deg, var(--primary-color), transparent);
    opacity: 0.1;
    filter: blur(20px);
    animation: glowPulse 4s infinite;
    z-index: -1;
}

@keyframes glowPulse {
    0% { opacity: 0.1; }
    50% { opacity: 0.2; }
    100% { opacity: 0.1; }
}

.file-input {
    text-align: center;
    margin-bottom: 2rem;
}

.drag-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    opacity: 0.5;
    transition: all 0.3s ease;
}

.converter-box.drag-over .drag-icon {
    opacity: 1;
    transform: scale(1.1);
}

.upload-btn {
    background: var(--card-bg);
    color: var(--primary-color);
    padding: 1rem 2rem;
    border-radius: 8px;
    cursor: pointer;
    display: inline-block;
    transition: all 0.3s ease;
    border: 1px solid var(--primary-color);
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.upload-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transition: 0.5s;
}

.upload-btn:hover::before {
    left: 100%;
}

.upload-btn:hover {
    background: var(--primary-color);
    color: var(--bg-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

select, button {
    width: 100%;
    padding: 1rem;
    margin: 0.5rem 0;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--card-bg);
    color: var(--text-color);
    transition: all 0.3s ease;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2300ff9d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 3rem;
}

select:hover:not(:disabled), button:hover:not(:disabled) {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

button {
    background: var(--primary-color);
    color: var(--bg-color);
    border: none;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

button:disabled {
    background: #333;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.status {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    min-height: 20px;
    transition: all 0.3s ease;
}

#loadingLibraries {
    color: var(--primary-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

.supported-formats {
    margin-top: 3rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.supported-formats:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.supported-formats summary {
    cursor: pointer;
    color: var(--primary-color);
    font-weight: 500;
    user-select: none;
    transition: all 0.3s ease;
}

.supported-formats summary:hover {
    color: var(--hover-color);
}

.supported-formats ul {
    margin-top: 1rem;
    color: var(--text-secondary);
    list-style-type: none;
    padding-left: 0;
}

.supported-formats li {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.supported-formats li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

#fileName {
    margin-left: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    opacity: 0.8;
}

.hidden {
    display: none;
}

.format-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
    min-height: 200px;
    position: relative;
    width: 100%;
}

.format-buttons > div {
    display: contents !important;
}

.format-button {
    background: var(--card-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    cursor: pointer;
    text-align: center;
    font-size: 0.9rem;
    position: relative;
    transform-origin: center center;
    will-change: transform, opacity;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    margin: 0;
    box-sizing: border-box;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.format-button:hover:not(.unavailable) {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.format-button.selected {
    background: var(--primary-color);
    color: var(--bg-color);
    border-color: var(--primary-color);
}

.format-button.unavailable {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    pointer-events: none;
    height: 45px;
}

.conversion-options {
    margin: 1.5rem 0;
}