:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #334155;
    --success-color: #10b981;
}

* {
    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;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 4rem); /* Full height minus body padding */
}

header {
    margin-bottom: 2rem;
    text-align: center;
    flex-shrink: 0;
}

main {
    flex: 1; /* Pushes footer down */
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.controls {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-group input {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.input-group input:focus {
    border-color: var(--accent-color);
}

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

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

.primary-btn:active {
    transform: translateY(1px);
}

.secondary-btn {
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.secondary-btn:hover:not(:disabled) {
    background-color: rgba(59, 130, 246, 0.1);
    border-color: var(--accent-color);
}

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

.results-container {
    background-color: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.results-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#result-count {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.uuid-list {
    list-style: none;
    max-height: 400px;
    overflow-y: auto;
}

.uuid-item {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary); /* Default slightly dimmed */
    transition: background-color 0.2s;
}

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

.uuid-item:hover {
    background-color: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
}

.copy-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: color 0.2s;
}

.copy-btn:hover {
    color: var(--accent-color);
    background-color: rgba(59, 130, 246, 0.1);
}

/* Scrollbar Styles */
.uuid-list::-webkit-scrollbar {
    width: 8px;
}

.uuid-list::-webkit-scrollbar-track {
    background: var(--bg-color);
}

.uuid-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.uuid-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.uuid-item {
    animation: fadeIn 0.3s ease-out forwards;
}

footer {
    margin-top: 3rem;
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s;
}

footer a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}