:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #f72585;
    --secondary-dark: #dc1c76;
    --success-color: #4cc9f0;
    --text-color: #2b2d42;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #6c757d;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-gray);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 120px auto 20px;
    background-color: var(--white);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.main-header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    padding: 15px 0;
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    height: 90px;
    display: flex;
    align-items: center;
}

.header-content {
    max-width: 900px;
    margin: 0 20;
    width: 100%;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.app-logo {
    width: 200px;
    height: auto;
    transition: var(--transition);
}

.header-text {
    text-align: right;
    flex-grow: 1;
    padding-right: 20px;
}

.header-text h1 {
    margin: 0;
    font-size: 1.3rem;
    color: var(--primary-color);
    font-weight: 600;
}

.tagline {
    color: var(--dark-gray);
    font-size: 0.9rem;
    margin: 2px 0 0;
}

@media (max-width: 768px) {
    body {
        padding: 0;
    }
    
    .container {
        padding: 20px;
        margin: 100px 10px 10px;
        border-radius: 0;
    }
    
    .main-header {
        padding: 10px 0;
        height: 80px;
    }
    
    .header-content {
        padding: 0 15px;
    }
    
    .app-logo {
        width: 140px;
    }

    .header-text {
        padding-right: 10px;
    }
    
    .drop-area {
        padding: 30px 15px;
    }
    
    .button-group {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .app-logo {
        width: 120px;
    }
    
    .header-text {
        padding-right: 5px;
    }
    
    .header-text h1 {
        font-size: 1.1rem;
        line-height: 1.2;
    }
    
    .tagline {
        font-size: 0.75rem;
    }
    
    .drop-icon {
        font-size: 2.5rem;
    }
    
    .drop-area p {
        font-size: 1rem;
    }
    
    label[for="fileInput"] {
        padding: 10px 20px;
    }
}

.drop-area {
    border: 2px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: 40px 20px;
    text-align: center;
    margin-bottom: 25px;
    background-color: rgba(67, 97, 238, 0.05);
    transition: var(--transition);
    cursor: pointer;
}

.drop-area.highlight {
    background-color: rgba(67, 97, 238, 0.1);
    border-color: var(--primary-dark);
    transform: scale(1.01);
}

.drop-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.drop-area p {
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: var(--dark-gray);
}

#fileInput {
    display: none;
}

label[for="fileInput"] {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    margin-top: 10px;
}

label[for="fileInput"]:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.file-list-container {
    margin-bottom: 25px;
}

.file-list {
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 15px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    animation: fadeIn 0.5s ease;
}

.file-list h3 {
    margin-bottom: 10px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.file-items-container {
    max-height: 200px;
    overflow-y: auto;
    border-radius: var(--border-radius);
    border: 1px solid var(--medium-gray);
    background-color: var(--white);
}

.file-item {
    padding: 10px 15px;
    border-bottom: 1px solid var(--medium-gray);
    display: flex;
    align-items: center;
}

.file-item i {
    margin-right: 8px;
    color: var(--primary-color);
}

.file-item:last-child {
    border-bottom: none;
}

.status {
    margin: 20px 0;
    padding: 15px;
    border-radius: var(--border-radius);
    background-color: var(--light-gray);
    display: none;
    animation: fadeIn 0.3s ease;
}

.status.show {
    display: block;
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 10px;
}

.progress-bar {
    flex: 1;
    background-color: var(--medium-gray);
    height: 12px;
    border-radius: 10px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background-color: var(--success-color);
    border-radius: 10px;
    width: 0%;
    transition: width 0.3s;
}

#progressText {
    font-weight: 600;
    min-width: 40px;
    color: var(--dark-gray);
}

#statusText {
    font-size: 1rem;
    padding: 5px 0;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.btn {
    flex: 1;
    padding: 12px 16px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.primary {
    background-color: var(--primary-color);
    color: white;
}

.primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.secondary {
    background-color: var(--secondary-color);
    color: white;
}

.secondary:hover:not(:disabled) {
    background-color: var(--secondary-dark);
    transform: translateY(-2px);
}

.btn:disabled {
    background-color: var(--medium-gray);
    cursor: not-allowed;
    transform: none;
    opacity: 0.7;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: var(--dark-gray);
    font-size: 0.9rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}