/* ============================================
   NES EMU — Design System
   ============================================ */

:root {
    /* Colors */
    --bg-primary:   #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card:      #1a1a26;
    --bg-hover:     #222233;
    --bg-input:     #16161f;

    --accent:       #6c5ce7;
    --accent-light: #a29bfe;
    --accent-glow:  rgba(108, 92, 231, 0.3);

    --success:      #00b894;
    --danger:       #ff6b6b;
    --warning:      #fdcb6e;

    --text-primary:   #e8e8f0;
    --text-secondary: #8888a0;
    --text-muted:     #555570;

    --border:       #2a2a3a;
    --border-light: #3a3a4a;

    /* Spacing */
    --gap-xs: 4px;
    --gap-sm: 8px;
    --gap-md: 12px;
    --gap-lg: 16px;
    --gap-xl: 24px;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Sizes */
    --header-h: 56px;
}

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

html, body {
    height: 100%;
    font-family: var(--font-sans);
    font-size: 14px;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
}

/* ============================================
   Layout
   ============================================ */

#app {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    height: var(--header-h);
    padding: 0 var(--gap-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
}

.header__logo-icon {
    font-size: 24px;
}

.header__logo h1 {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.accent {
    color: var(--accent);
}

.header__status {
    display: flex;
    align-items: center;
    gap: var(--gap-md);
}

.main {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* ============================================
   Game Panel
   ============================================ */

.game-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--gap-xl);
    gap: var(--gap-md);
    min-width: 0;
}

.screen-wrapper {
    position: relative;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow:
        0 0 0 1px var(--border),
        0 8px 40px rgba(0, 0, 0, 0.6),
        0 0 80px var(--accent-glow);
    /* CRT scanline effect applied via pseudo-element */
}

.screen-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.08) 0px,
        rgba(0, 0, 0, 0.08) 1px,
        transparent 1px,
        transparent 3px
    );
    pointer-events: none;
    z-index: 2;
}

#nes-screen {
    display: block;
    width: 512px;
    height: 480px;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    background: #111;
}

.screen-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(4px);
    z-index: 3;
    transition: opacity 0.3s ease;
}

.screen-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay-content {
    text-align: center;
    color: var(--text-secondary);
}

.overlay-icon {
    font-size: 48px;
    margin-bottom: var(--gap-md);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.05); }
}

.screen-controls {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
}

.frame-counter {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
}

/* ============================================
   Control Panel
   ============================================ */

.control-panel {
    width: 340px;
    border-left: 1px solid var(--border);
    background: var(--bg-secondary);
    overflow-y: auto;
    padding: var(--gap-lg);
    display: flex;
    flex-direction: column;
    gap: var(--gap-lg);
    flex-shrink: 0;
}

.panel-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--gap-lg);
}

.panel-title {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: var(--gap-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--gap-xs);
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn--primary {
    background: var(--accent);
    color: white;
    width: 100%;
}

.btn--primary:hover:not(:disabled) {
    background: #5a4dd4;
    box-shadow: 0 4px 16px var(--accent-glow);
}

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

.btn--secondary:hover:not(:disabled) {
    background: var(--border);
}

.btn--ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px dashed var(--border);
    width: 100%;
}

.btn--ghost:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}

.btn--danger {
    background: rgba(255, 107, 107, 0.15);
    color: var(--danger);
    border: 1px solid rgba(255, 107, 107, 0.3);
    width: 100%;
}

.btn--danger:hover {
    background: rgba(255, 107, 107, 0.25);
}

.btn--icon {
    width: 36px;
    height: 36px;
    padding: 0;
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.btn--icon:hover:not(:disabled) {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn--sm {
    padding: 4px 10px;
    font-size: 12px;
    height: 28px;
}

/* ============================================
   Forms
   ============================================ */

.form-group {
    margin-bottom: var(--gap-md);
}

.form-group label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--gap-xs);
}

.input-select, .input-text {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 13px;
    outline: none;
    transition: border-color 0.15s;
}

.input-select:focus, .input-text:focus {
    border-color: var(--accent);
}

.rom-select-wrapper {
    display: flex;
    gap: var(--gap-xs);
    margin-bottom: var(--gap-sm);
}

.rom-select-wrapper .input-select {
    flex: 1;
}

.upload-area {
    margin-bottom: var(--gap-sm);
}

.join-wrapper {
    display: flex;
    gap: var(--gap-xs);
}

.join-wrapper .input-text {
    flex: 1;
}

.mono {
    font-family: var(--font-mono);
    font-size: 11px;
}

/* ============================================
   Status Badges
   ============================================ */

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-badge--disconnected {
    background: rgba(255, 107, 107, 0.12);
    color: var(--danger);
}

.status-badge--disconnected .status-dot {
    background: var(--danger);
}

.status-badge--connected {
    background: rgba(0, 184, 148, 0.12);
    color: var(--success);
}

.status-badge--connected .status-dot {
    background: var(--success);
    animation: blink 2s ease-in-out infinite;
}

.status-badge--connecting {
    background: rgba(253, 203, 110, 0.12);
    color: var(--warning);
}

.status-badge--connecting .status-dot {
    background: var(--warning);
    animation: blink 0.8s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.ping-badge {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
    padding: 4px 10px;
    background: var(--bg-card);
    border-radius: 100px;
    border: 1px solid var(--border);
}

.ping-value {
    color: var(--success);
    font-weight: 600;
}

/* ============================================
   Controls Grid
   ============================================ */

.controls-grid {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.control-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    transition: background 0.1s;
}

.control-row:hover {
    background: var(--bg-hover);
}

.key-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.key-binding {
    font-size: 12px;
    color: var(--text-muted);
}

kbd {
    display: inline-block;
    padding: 2px 6px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-primary);
    box-shadow: 0 1px 0 var(--border-light);
}

.gamepad-info {
    margin-top: var(--gap-sm);
    padding: 8px;
    background: rgba(0, 184, 148, 0.08);
    border: 1px solid rgba(0, 184, 148, 0.2);
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--success);
}

/* ============================================
   Session Info
   ============================================ */

.session-info {
    display: flex;
    flex-direction: column;
    gap: var(--gap-sm);
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
}

.info-label {
    font-size: 12px;
    color: var(--text-muted);
}

.info-value {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
}

/* ============================================
   Sessions List
   ============================================ */

.sessions-list {
    display: flex;
    flex-direction: column;
    gap: var(--gap-sm);
    max-height: 200px;
    overflow-y: auto;
}

.session-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s;
}

.session-item:hover {
    border-color: var(--accent);
    background: var(--bg-hover);
}

.session-item__info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.session-item__id {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-primary);
}

.session-item__status {
    font-size: 11px;
    color: var(--text-muted);
}

.session-item__players {
    font-size: 12px;
    color: var(--accent-light);
    font-weight: 500;
}

.empty-text {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    padding: var(--gap-md);
}

/* ============================================
   Scrollbar
   ============================================ */

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

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

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 900px) {
    .main {
        flex-direction: column;
    }
    .control-panel {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border);
        flex-direction: row;
        flex-wrap: wrap;
        overflow-y: visible;
        max-height: 300px;
    }
    .panel-section {
        flex: 1;
        min-width: 200px;
    }
    #nes-screen {
        width: 100%;
        max-width: 512px;
        height: auto;
        aspect-ratio: 256 / 240;
    }
}