:root {
    --bg-app: #0f172a;
    /* Tailwind Slate 900 */
    --bg-card: #1e293b;
    /* Tailwind Slate 800 */
    --bg-card-hover: #334155;
    /* Tailwind Slate 700 */

    --text-main: #f8fafc;
    --text-muted: #94a3b8;

    --accent-cyan: #06b6d4;
    --accent-purple: #a855f7;
    --accent-green: #10b981;
    --accent-pink: #ec4899;

    --font-ui: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-ui);
    background-color: var(--bg-app);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Welcome Screen */
.welcome-screen {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-app);
    z-index: 100;
    transition: opacity 0.3s, visibility 0.3s;
}

.welcome-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.welcome-content {
    text-align: center;
    max-width: 600px;
    padding: 2rem;
}

.welcome-content h1 {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.1;
    background: linear-gradient(135deg, #38bdf8, #818cf8, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.welcome-content p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* App Layout */
.app-layout {
    display: flex;
    flex-wrap: wrap;
    /* Fallback for extreme small screens, but mostly flex row/column */
    height: 100vh;
    opacity: 1;
    transition: opacity 0.3s;
}

.app-layout.hidden {
    display: none;
}

/* Topbar */
.topbar {
    width: 100%;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-muted);
}

.brand-icon {
    color: var(--accent-cyan);
}

/* Controls */
.controls {
    display: flex;
    align-items: center;
}

.toggle-switch {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.toggle-switch input {
    display: none;
}

.slider {
    position: relative;
    width: 38px;
    height: 22px;
    background-color: var(--bg-card);
    border-radius: 22px;
    transition: .2s;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.slider::before {
    content: "";
    position: absolute;
    height: 16px;
    width: 16px;
    left: 2px;
    bottom: 2px;
    background-color: var(--text-muted);
    border-radius: 50%;
    transition: .2s;
}

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

.toggle-switch input:checked+.slider::before {
    transform: translateX(16px);
    background-color: white;
}

.label-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.toggle-switch:hover .label-text {
    color: var(--text-main);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 2rem;
    overflow-y: auto;
}

/* Hero */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 0 4rem 0;
    flex-shrink: 0;
}

.key-name-banner {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
    padding: 0.5rem 1.5rem;
    border-radius: 30px;
    margin-bottom: 1rem;
    font-family: var(--font-mono);
    max-width: 90%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.huge-number {
    font-size: 12rem;
    font-weight: 900;
    line-height: 1;
    color: var(--text-main);
    text-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Properties Grid */
.properties-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.prop-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

.prop-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
}

.prop-card:active {
    transform: translateY(0);
}

.prop-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.prop-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    font-family: var(--font-mono);
    word-break: break-all;
}

.prop-value.boolean-val[data-state="true"] {
    color: var(--accent-green);
}

.prop-value.boolean-val[data-state="false"] {
    color: var(--accent-pink);
}

.badge {
    font-size: 0.65rem;
    background: rgba(236, 72, 153, 0.2);
    color: var(--accent-pink);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-ui);
    text-transform: uppercase;
    font-weight: 700;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: rgba(0, 0, 0, 0.2);
    border-left: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.sidebar-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header .badge {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
}

.history-list {
    list-style: none;
    overflow-y: auto;
    flex: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    border: 1px solid transparent;
    transition: all 0.2s;
}

.history-item.new-item {
    animation: slideIn 0.3s ease-out forwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }

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

.hist-key {
    color: var(--text-main);
    font-weight: 600;
}

.hist-code {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: white;
    color: var(--bg-app);
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.9rem;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

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

/* Responsiveness */
@media (max-width: 900px) {
    .app-layout {
        flex-direction: column;
        overflow-y: auto;
    }

    .main-content {
        overflow: visible;
    }

    .sidebar {
        width: 100%;
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.05);
        height: 400px;
    }
}