:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --bg-color: #f8fafc;
    --panel-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --input-bg: #f1f5f9;
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 0.5rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-secondary);
}

/* Tabs */
.tab-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

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

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Layout */
.panel-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.full-width-panel {
    grid-column: 1 / -1;
    margin-bottom: 0;
    /* Removing excess margin if handled by grid gap */
}

@media (max-width: 768px) {
    .panel-grid {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--panel-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

h2,
h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
}

h2 {
    border-bottom: 2px solid var(--border-color);
}

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

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

textarea,
input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background-color: var(--input-bg);
    font-family: 'Inter', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: all 0.2s;
    resize: vertical;
}

textarea:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-with-button {
    display: flex;
    gap: 0.5rem;
}

button {
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    transition: all 0.2s;
}

.primary-btn {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary-color);
    color: white;
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

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

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

.secondary-btn {
    padding: 0 1rem;
    background-color: white;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

.textarea-wrapper {
    position: relative;
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.25rem 0.5rem;
    background-color: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

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