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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #edf5ff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-primary: #0f4ba5;
    --accent-hover: #1177bb;
    --accent-danger: #c75450;
    --accent-danger-hover: #d96965;
    --border-color: #e2e8f0;
    --success-color: #4ec9b0;
    --error-color: #f48771;
    --warning-color: #cca700;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--accent-primary), var(--success-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.options-bar {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.toggle input {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 50px;
    height: 26px;
    background-color: var(--bg-tertiary);
    border-radius: 13px;
    transition: background-color 0.3s;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background-color: var(--text-primary);
    border-radius: 50%;
    transition: transform 0.3s;
}

.toggle input:checked + .toggle-slider {
    background-color: var(--accent-primary);
}

.toggle input:checked + .toggle-slider::after {
    transform: translateX(24px);
}

.toggle-label {
    color: var(--text-primary);
    font-size: 0.95rem;
}

.panels {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    align-items: stretch;
}

.panel {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    min-height: 400px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.stats {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.panel-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 15px;
}

textarea {
    flex: 1;
    width: 100%;
    min-height: 200px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color 0.3s;
}

textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

textarea::placeholder {
    color: var(--text-secondary);
}

.file-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.file-name {
    color: var(--text-secondary);
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.validation-status {
    min-height: 24px;
    font-size: 0.85rem;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.3s;
}

.validation-status.valid {
    background-color: rgba(78, 201, 176, 0.1);
    color: var(--success-color);
}

.validation-status.invalid {
    background-color: rgba(244, 135, 113, 0.1);
    color: var(--error-color);
}

.panel-controls {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 15px;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-primary);
    border-color: var(--accent-primary);
}

.btn-danger {
    background-color: transparent;
    color: var(--accent-danger);
    border: 1px solid var(--accent-danger);
}

.btn-danger:hover {
    background-color: var(--accent-danger);
    color: white;
}

.action-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.action-buttons .btn {
    flex: 1;
    min-width: 100px;
}

.icon {
    width: 18px;
    height: 18px;
}

.error-message {
    margin-top: 20px;
    padding: 15px 20px;
    background-color: rgba(199, 84, 80, 0.1);
    border: 1px solid var(--accent-danger);
    border-radius: 8px;
    color: var(--error-color);
    display: none;
}

.error-message.show {
    display: block;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 900px) {
    .panels {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }

    .panel-controls {
        flex-direction: row;
        justify-content: center;
    }

    .panel {
        min-height: 300px;
    }
}

@media (max-width: 500px) {
    header h1 {
        font-size: 1.8rem;
    }

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

    .action-buttons .btn {
        width: 100%;
    }

    .panel-controls {
        flex-direction: column;
    }

    .panel-controls .btn {
        width: 100%;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-color);
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--success-color);
    color: var(--bg-primary);
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}