/* ========================================
   UUID Generator — Clean Dark Theme
   ======================================== */
:root {
    --primary: #10B981;
    --primary-hover: #059669;
    --primary-glow: rgba(16, 185, 129, 0.2);
    --bg: #0C1015;
    --bg-card: rgba(14, 18, 24, 0.85);
    --bg-hover: #161C24;
    --bg-input: rgba(10, 14, 20, 0.7);
    --border: rgba(16, 185, 129, 0.12);
    --border-hover: rgba(16, 185, 129, 0.3);
    --text: #E8ECF0;
    --text-secondary: #9CA3AF;
    --text-muted: #6B7280;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    --font: 'Inter', -apple-system, sans-serif;
    --transition: 0.2s ease;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.app {
    max-width: 640px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

.header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.3rem;
}

.logo-icon {
    font-size: 1.4rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), #34D399);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.15rem;
    margin-bottom: 1rem;
}

.controls {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: flex-end;
    margin-bottom: 0.75rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.control-group label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.control-group select,
.control-group input[type="number"] {
    padding: 0.45rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.82rem;
    outline: none;
}

.control-group select:focus,
.control-group input:focus {
    border-color: var(--primary);
}

.control-group input[type="number"] {
    width: 70px;
}

input[type="checkbox"] {
    accent-color: var(--primary);
}

.toggle-group {
    flex-direction: row;
    gap: 0.75rem;
    align-items: center;
}

.toggle-group label {
    font-size: 0.78rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.btn-row {
    display: flex;
    gap: 0.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.5rem 0.85rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    flex: 1;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), #34D399);
    color: #0C1015;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-secondary {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--text);
}

.btn-secondary:hover {
    background: rgba(16, 185, 129, 0.18);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.card-title {
    font-size: 0.85rem;
    font-weight: 700;
}

.count-badge {
    font-size: 0.7rem;
    background: rgba(16, 185, 129, 0.15);
    color: var(--primary);
    padding: 0.1rem 0.4rem;
    border-radius: 100px;
    font-weight: 600;
}

.results-list {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.uuid-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.6rem;
    background: rgba(16, 185, 129, 0.04);
    border: 1px solid rgba(16, 185, 129, 0.08);
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.uuid-item:hover {
    background: rgba(16, 185, 129, 0.08);
}

.uuid-text {
    flex: 1;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    word-break: break-all;
    user-select: all;
}

.uuid-copy {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0.2rem;
    transition: transform 0.15s;
}

.uuid-copy:hover {
    transform: scale(1.15);
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 0.55rem 1rem;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.82rem;
    font-weight: 500;
    box-shadow: var(--shadow);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 100;
    pointer-events: none;
}

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

.hidden {
    display: none !important;
}

@media (max-width: 480px) {
    .app {
        padding: 1rem 0.85rem 3rem;
    }

    .controls {
        flex-direction: column;
    }
}