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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    min-height: 100vh;
    color: #ffffff;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, #4a9eff, #00d4ff);
    border-radius: 2px;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #4a9eff, #00d4ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.1rem;
    color: #b0b0b0;
    font-weight: 300;
}

.tabs {
    display: flex;
    background: rgba(45, 45, 45, 0.3);
    border-radius: 15px;
    padding: 8px;
    margin-bottom: 30px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tab {
    flex: 1;
    padding: 15px 20px;
    text-align: center;
    background: transparent;
    border: none;
    color: #b0b0b0;
    cursor: pointer;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.tab.active {
    background: linear-gradient(135deg, #4a9eff, #0066cc);
    color: white;
    box-shadow: 0 4px 15px rgba(74, 158, 255, 0.3);
}

.tab:hover:not(.active) {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.tab-content.active {
    display: block;
}

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

.card {
    background: rgba(45, 45, 45, 0.4);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 25px;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.card-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ffffff;
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.file-input {
    display: none;
}

.file-input-label {
    flex: 1;
    padding: 15px 20px;
    background: rgba(61, 61, 61, 0.6);
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #b0b0b0;
}

.file-input-label:hover {
    border-color: #4a9eff;
    background: rgba(74, 158, 255, 0.1);
    color: #ffffff;
}

.file-input-label.has-file {
    border-color: #4ade80;
    background: rgba(74, 222, 128, 0.1);
    color: #4ade80;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    min-width: 150px;
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(135deg, #4a9eff, #0066cc);
    color: white;
    box-shadow: 0 4px 15px rgba(74, 158, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 158, 255, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.textarea {
    width: 100%;
    min-height: 120px;
    padding: 15px;
    background: rgba(61, 61, 61, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: #ffffff;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    resize: vertical;
    transition: border-color 0.3s ease;
}

.textarea:focus {
    outline: none;
    border-color: #4a9eff;
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.1);
}

.result-area {
    background: rgba(35, 35, 35, 0.8);
    border-radius: 12px;
    padding: 20px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    min-height: 150px;
    border-left: 4px solid #4a9eff;
}

.success {
    border-left-color: #4ade80;
    background: rgba(74, 222, 128, 0.1);
}

.error {
    border-left-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.help-content {
    line-height: 1.8;
    color: #e0e0e0;
}

.help-section {
    margin-bottom: 25px;
}

.help-section h3 {
    color: #4a9eff;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.help-section ul {
    list-style: none;
    padding-left: 0;
}

.help-section li {
    padding: 5px 0;
    padding-left: 20px;
    position: relative;
}

.help-section li::before {
    content: '•';
    color: #4a9eff;
    position: absolute;
    left: 0;
    font-weight: bold;
}

.warning {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 12px;
    padding: 15px;
    margin: 20px 0;
}

.loading {
    display: none;
    text-align: center;
    padding: 20px;
}

.spinner {
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid #4a9eff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.copy-btn {
    margin-top: 10px;
    padding: 8px 15px;
    font-size: 0.8rem;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .tabs {
        flex-direction: column;
        gap: 5px;
    }
    
    .card {
        padding: 20px;
    }
    
    .file-input-wrapper {
        flex-direction: column;
    }
}