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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
    padding-top: 40px;
}

.header h1 {
    font-size: 36px;
    margin-bottom: 10px;
    font-weight: 700;
}

.header p {
    font-size: 18px;
    opacity: 0.95;
}

.container {
    background: white;
    border-radius: 20px;
    padding: 50px;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 12px;
    padding: 60px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: #f8f9ff;
}

.upload-area:hover {
    border-color: #764ba2;
    background: #f0f2ff;
    transform: translateY(-2px);
}

.upload-area.dragover {
    border-color: #764ba2;
    background: #e8ebff;
}

.upload-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.upload-area h3 {
    color: #333;
    font-size: 22px;
    margin-bottom: 10px;
    font-weight: 600;
}

.upload-area p {
    color: #666;
    font-size: 14px;
}

.file-input {
    display: none;
}

.btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 30px;
    transition: all 0.2s;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.loading {
    display: none;
    text-align: center;
    margin-top: 30px;
}

.loading.show {
    display: block;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.result {
    display: none;
    margin-top: 30px;
    padding: 25px;
    background: #e8f5e9;
    border-radius: 8px;
    border-left: 4px solid #4caf50;
}

.result.show {
    display: block;
}

.result h3 {
    color: #2e7d32;
    margin-bottom: 15px;
    font-size: 18px;
}

.link-box {
    display: flex;
    gap: 10px;
}

.link-box input {
    flex: 1;
    padding: 12px;
    border: 2px solid #4caf50;
    border-radius: 6px;
    font-size: 14px;
    font-family: 'Courier New', monospace;
}

.copy-btn {
    padding: 12px 24px;
    background: #4caf50;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

.copy-btn:hover {
    background: #45a049;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
    text-align: center;
}

.feature {
    padding: 20px;
}

.feature-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.feature h4 {
    font-size: 16px;
    color: #333;
    margin-bottom: 5px;
    font-weight: 600;
}

.feature p {
    font-size: 13px;
    color: #666;
}

.footer {
    text-align: center;
    color: white;
    margin-top: 40px;
    opacity: 0.8;
    font-size: 14px;
}

@media (max-width: 768px) {
    .container {
        padding: 30px 20px;
    }

    .header h1 {
        font-size: 28px;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .upload-area {
        padding: 40px 20px;
    }
}