:root {
    --primary-color: #2D2D2D;
    --secondary-color: #6B7280;
    --accent-color: #0066F5;
    --background-color: #FFFFFF;
    --border-color: #E5E7EB;
    --hover-color: #F3F4F6;
    --error-color: #EF4444;
    --success-color: #10B981;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #F9FAFB;
    color: var(--primary-color);
    line-height: 1.5;
}

.app-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem;
}

.content-wrapper {
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    padding: 2rem;
}

header {
    margin-bottom: 2rem;
}

h1 {
    font-size: 1.875rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--secondary-color);
    font-size: 1rem;
}

.upload-container {
    margin-top: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    color: var(--primary-color);
    background-color: white;
    transition: all 0.2s;
    cursor: pointer;
}

select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 245, 0.1);
}

.file-upload-area {
    margin-bottom: 1.5rem;
}

.file-input {
    display: none;
}

.file-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.file-label:hover {
    background-color: var(--hover-color);
    border-color: var(--accent-color);
}

.upload-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.upload-text {
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--secondary-color);
}

.upload-button {
    width: 100%;
    padding: 0.875rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-button:hover:not(:disabled) {
    background-color: #0052CC;
}

.upload-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.3s;
}

.status.show {
    opacity: 1;
}

.status.success {
    background-color: #ECFDF5;
    color: var(--success-color);
}

.status.error {
    background-color: #FEF2F2;
    color: var(--error-color);
}

.status.loading {
    background-color: #F3F4F6;
    color: var(--secondary-color);
}