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

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --secondary-color: #6b7280;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 2rem 1rem;
    color: var(--text-primary);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

/* Config Section */
.config-section {
    margin-bottom: 2rem;
}

.config-grid {
    display: grid;
    gap: 1.5rem;
}

.config-item {
    display: flex;
    flex-direction: column;
}

.config-item label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.config-item input {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.config-item input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.config-item small {
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Mode Section */
.mode-section {
    margin-bottom: 2rem;
}

.mode-toggle {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-color);
    padding: 0.5rem;
    border-radius: 12px;
}

.mode-btn {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid transparent;
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.mode-btn:hover {
    color: var(--primary-color);
}

.mode-btn.active {
    background: white;
    color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

/* Input/Output Section */
.input-section,
.output-section {
    margin-bottom: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.input-section textarea,
.output-section textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    transition: all 0.3s ease;
    background: var(--bg-color);
    color: var(--text-primary);
}

.input-section textarea:focus,
.output-section textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    background: white;
}

.output-section textarea {
    background: #f8fafc;
}

.btn-copy {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.btn-copy:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-copy:active {
    transform: translateY(0);
}

.btn-copy-log {
    background: var(--success-color);
}

.btn-copy-log:hover {
    background: var(--success-hover);
}

/* Upload Section */
.upload-section {
    margin-bottom: 2rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-color);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.05);
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    color: var(--primary-color);
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

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

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: 8px;
    margin-top: 1rem;
}

.file-name {
    color: var(--text-primary);
    font-weight: 500;
}

.btn-remove {
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.btn-remove:hover {
    background: var(--danger-hover);
    transform: scale(1.1);
}

/* Action Section */
.action-section {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn {
    flex: 1;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.6;
}

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

.btn-secondary:hover {
    background: #4b5563;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: var(--success-color);
    color: white;
    width: 100%;
}

.btn-success:hover {
    background: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(400px);
        opacity: 0;
    }
}

/* Log Section */
.log-section {
    margin-bottom: 2rem;
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.log-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-clear {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-clear:hover {
    background: var(--danger-hover);
}

.log-container {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1.5rem;
    border-radius: 8px;
    max-height: 400px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.log-entry {
    padding: 0.5rem 0;
    border-bottom: 1px solid #334155;
}

.log-entry:last-child {
    border-bottom: none;
}

.log-timestamp {
    color: #94a3b8;
    margin-right: 0.5rem;
}

.log-success {
    color: #34d399;
}

.log-error {
    color: #f87171;
}

.log-info {
    color: #60a5fa;
}

/* Result Section */
.result-section {
    margin-bottom: 1rem;
}

.result-stats {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    color: var(--text-primary);
    font-weight: 600;
}

.stat-value.success {
    color: var(--success-color);
}

.stat-value.error {
    color: var(--danger-color);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 2rem;
    color: white;
    font-size: 0.875rem;
}

/* Scrollbar Styles */
.log-container::-webkit-scrollbar {
    width: 8px;
}

.log-container::-webkit-scrollbar-track {
    background: #0f172a;
    border-radius: 4px;
}

.log-container::-webkit-scrollbar-thumb {
    background: #475569;
    border-radius: 4px;
}

.log-container::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    .container {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .action-section {
        flex-direction: column;
    }

    .upload-area {
        padding: 2rem 1rem;
    }
}