:root {
    --bg-color: #f9f9f9;
    --surface: #ffffff;
    --primary: #333333;
    --primary-hover: #000000;
    --text-main: #333333;
    --text-muted: #666666;
    --border: #e0e0e0;
    --border-hover: #bbbbbb;
    --success: #10b981;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.container {
    background-color: var(--surface);
    width: 100%;
    max-width: 600px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    padding: 2.5rem;
    border: 1px solid var(--border);
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

#file-input {
    display: none;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2.5rem 1.5rem;
    border: 1px dashed var(--border);
    border-radius: 8px;
    background-color: #fafafa;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.upload-label:hover, .upload-label.dragover {
    border-color: var(--primary);
    background-color: #f0f0f0;
}

.upload-text {
    font-size: 0.95rem;
    color: var(--text-main);
}

.file-name {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    font-weight: bold;
    word-break: break-all;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.settings {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    background-color: #fafafa;
    font-size: 0.9rem;
}

.settings select {
    background-color: transparent;
    border: none;
    font-family: inherit;
    font-size: 0.9rem;
    color: var(--primary);
    cursor: pointer;
    outline: none;
}

.btn {
    width: 100%;
    padding: 0.85rem;
    border: 1px solid var(--primary);
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--surface);
    color: var(--primary);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    border-color: var(--border);
    color: var(--text-muted);
}

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

.primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.notification-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: -0.5rem;
}

.progress-section, .result-section {
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background-color: #fafafa;
    margin-bottom: 1.5rem;
}

.status-text {
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background-color: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary);
    width: 0%;
    transition: width 0.3s ease;
}

.log-container {
    height: 80px;
    background-color: var(--surface);
    color: var(--text-muted);
    font-family: monospace;
    font-size: 0.75rem;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    overflow-y: auto;
}

.result-section {
    text-align: center;
}

.result-section h3 {
    color: var(--success);
    margin-bottom: 0.5rem;
}

.result-section p {
    font-size: 0.9rem;
    color: var(--text-muted);
}