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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* Header Styles */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-img {
    width: 200px;
    height: 40px;
    object-fit: contain;
}

.nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: background-color 0.3s ease;
    font-weight: 500;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(255, 255, 255, 0.25);
}

/* Search Section */
.search-section {
    padding: 2rem 0;
    background: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.search-box {
    display: flex;
    gap: 0.5rem;
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 2px solid #e0e0e0;
    border-radius: 30px;
    font-size: 1rem;
    transition: all 0.3s ease;
    outline: none;
}

.search-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-btn {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

/* Main Content */
.main {
    padding: 2rem 0;
}

/* Tools Section */
.tools {
    padding: 2rem 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.tool-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    text-align: center;
    border: 1px solid #e8e8e8;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.tool-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.tool-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: #667eea;
    font-weight: 600;
}

.tool-description {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
    font-size: 0.95rem;
}

.tool-btn {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.8rem 2rem;
    border-radius: 25px;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
    box-shadow: 0 4px 6px rgba(102, 126, 234, 0.25);
}

.tool-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(102, 126, 234, 0.4);
}

.tool-card.hidden {
    display: none;
}

/* Footer Styles */
.footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-text {
    opacity: 0.9;
}

/* Converter Tool Styles */
.converter {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    max-width: 900px;
    margin: 2rem auto;
    border: 1px solid #e8e8e8;
}

.converter-title {
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 700;
}

.converter-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.form-label {
    font-weight: 600;
    color: #333;
    font-size: 1rem;
}

.form-input {
    padding: 0.9rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.file-input-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.file-input {
    font-size: 1rem;
    padding: 1rem;
    background: #f8f9fa;
    border: 2px dashed #d0d0d0;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    width: 100%;
    color: #666;
}

.file-input:hover {
    background: #f0f0f0;
    border-color: #667eea;
    color: #667eea;
}

#file-upload {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

.preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 10px;
}

.preview-title {
    font-weight: 600;
    color: #333;
    font-size: 0.95rem;
}

.preview-image {
    max-width: 100%;
    max-height: 280px;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    object-fit: contain;
    background: white;
}

.preview-ico {
    max-width: 120px;
    max-height: 120px;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    background: white;
}

.actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.9rem 2rem;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    min-width: 120px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 6px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(102, 126, 234, 0.4);
}

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

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.download-btn {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    box-shadow: 0 4px 6px rgba(17, 153, 142, 0.3);
}

.download-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(17, 153, 142, 0.4);
}

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

.message {
    padding: 1rem 1.5rem;
    border-radius: 10px;
    margin: 1rem 0;
    text-align: center;
    font-weight: 500;
}

.message-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .search-box {
        flex-direction: column;
    }

    .search-btn {
        width: 100%;
    }

    .converter-form {
        grid-template-columns: 1fr;
    }

    .actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    .nav {
        gap: 1rem;
    }

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

    .tool-card {
        padding: 1.5rem;
    }

    .tool-title {
        font-size: 1.3rem;
    }

    .converter {
        padding: 1.5rem;
    }

    .converter-title {
        font-size: 1.5rem;
    }
}