:root {
    --bg-color: #050505;
    --card-bg: rgba(20, 20, 22, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #e0e0e0;
    --text-secondary: #888;
    --accent-color: #00ff88;
    --accent-hover: #00cc6a;
    --danger-color: #ff3333;
    --glass-blur: blur(16px);
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    background-image: radial-gradient(circle at 50% 0%, rgba(0, 255, 136, 0.05), transparent 50%);
}

#app-container {
    width: 100%;
    max-width: 900px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon { font-size: 1.5rem; }
.logo-text { font-family: var(--font-mono); font-weight: 800; letter-spacing: 2px; font-size: 1.25rem; }

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-color);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(0, 255, 136, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0); }
}

/* Views & Cards */
.view {
    display: none;
    animation: fadeIn 0.3s ease-out;
}
.view.active { display: block; }
.hidden { display: none !important; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.glass-card h2 {
    font-family: var(--font-mono);
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}
.subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

/* Buttons */
button {
    cursor: pointer;
    border: none;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-weight: 600;
    transition: all 0.2s;
}

.btn-primary, .btn-secondary, .btn-danger, .btn-success {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-primary { background: var(--accent-color); color: #000; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }

.btn-secondary { background: rgba(255, 255, 255, 0.1); color: var(--text-primary); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: rgba(255, 255, 255, 0.15); }

.btn-danger { background: var(--danger-color); color: #fff; font-family: var(--font-mono); font-weight: 700; letter-spacing: 1px;}
.btn-danger:hover { background: #ff4d4d; }

.btn-success { background: var(--accent-color); color: #000; font-size: 1.1rem; }

.btn-action { background: rgba(255,255,255,0.1); color: #fff; padding: 0.5rem 1rem; }
.btn-action:hover { background: rgba(255,255,255,0.2); }

.back-btn { background: none; color: var(--text-secondary); margin-bottom: 1rem; padding: 0; font-size: 0.9rem;}
.back-btn:hover { color: var(--text-primary); }

.w-100 { width: 100%; }
.mt-4 { margin-top: 1.5rem; }

/* Role Selector */
.role-selector {
    display: flex;
    gap: 1rem;
}
.role-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    gap: 1rem;
    height: 100%;
}
.role-btn .btn-icon { font-size: 2rem; }
.role-btn .btn-text { text-align: left; display: flex; flex-direction: column; gap: 0.25rem; }
.role-btn .btn-text span { font-size: 0.8rem; opacity: 0.8; font-weight: 400; }

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.2s;
    background: rgba(0,0,0,0.2);
}
.upload-zone:hover { border-color: var(--accent-color); background: rgba(0, 255, 136, 0.02); }
.hidden-input { display: none; }
.upload-label { cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.upload-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.file-limits { font-size: 0.8rem; color: var(--text-secondary); }

/* Active State & Inputs */
.file-details { display: flex; justify-content: space-between; background: rgba(0,0,0,0.3); padding: 1rem; border-radius: 6px; margin-bottom: 1.5rem; font-family: var(--font-mono); }
.file-size { color: var(--text-secondary); }

.invite-section { margin-bottom: 2rem; }
.invite-label { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 0.5rem; font-family: var(--font-mono); }
.invite-box { display: flex; gap: 0.5rem; }
.invite-box input { flex: 1; background: rgba(0,0,0,0.4); border: 1px solid var(--border-color); color: var(--accent-color); padding: 0.75rem; border-radius: 4px; font-family: var(--font-mono); font-size: 0.9rem; }
.security-note { font-size: 0.75rem; color: #ffaa00; margin-top: 0.5rem; }

.input-group { margin-bottom: 1.5rem; }
.input-group label { display: block; margin-bottom: 0.5rem; font-size: 0.9rem; color: var(--text-secondary); font-family: var(--font-mono); }
.tech-input { width: 100%; background: rgba(0,0,0,0.4); border: 1px solid var(--border-color); color: #fff; padding: 0.75rem; border-radius: 4px; font-family: var(--font-mono); font-size: 1rem; }
.tech-input:focus { outline: none; border-color: var(--accent-color); }

/* Video & Canvas Monitor */
.broadcast-monitor {
    background: #000;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}
.monitor-header {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: rgba(255,255,255,0.05);
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.freq-display { color: var(--accent-color); font-weight: bold; }
.video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    background: #111;
}
canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    /* Optional: Green tint effect via CSS */
    filter: sepia(100%) hue-rotate(90deg) saturate(300%) brightness(0.8);
}
.overlay-stats {
    position: absolute;
    bottom: 10px;
    left: 10px;
    color: var(--accent-color);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-shadow: 0 0 4px #000;
}

/* Receiver specific */
.scanline-effect::after {
    content: " ";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    z-index: 2;
    background-size: 100% 2px, 3px 100%;
    pointer-events: none;
}

.progress-bar-container {
    width: 100%;
    max-width: 300px;
    height: 4px;
    background: rgba(255,255,255,0.2);
    margin-top: 5px;
    border-radius: 2px;
}
.progress-bar {
    height: 100%;
    background: var(--accent-color);
    width: 0%;
    transition: width 0.1s;
}

/* Burnout Timer */
#burnout-container {
    margin-top: 1.5rem;
    text-align: center;
}
.burnout-alert {
    background: rgba(255, 51, 51, 0.1);
    border: 1px solid var(--danger-color);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}
.burnout-alert h3 { color: var(--danger-color); font-family: var(--font-mono); margin-bottom: 0.5rem; }
.timer-text { font-size: 1.5rem; font-weight: 800; font-family: var(--font-mono); color: #fff; }

.pulse { animation: buttonPulse 1s infinite; }
@keyframes buttonPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
}

.toast {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    border-left: 4px solid var(--accent-color);
    color: #fff;
    padding: 1rem 1.5rem;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    opacity: 0;
    transform: translateX(100%);
    animation: toastSlideIn 0.3s forwards;
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.success {
    border-left-color: var(--accent-color);
}

.toast.fade-out {
    animation: toastFadeOut 0.3s forwards;
}

@keyframes toastSlideIn {
    to { opacity: 1; transform: translateX(0); }
}
@keyframes toastFadeOut {
    to { opacity: 0; transform: translateY(-10px); }
}

/* Responsive / Mobile View */
@media (max-width: 768px) {
    #app-container {
        padding: 1rem;
        gap: 1.5rem;
    }
    
    .role-selector {
        flex-direction: column;
    }
    
    .glass-card {
        padding: 1.5rem;
    }
    
    .logo-text {
        font-size: 1.1rem;
    }
    
    .status-indicator {
        font-size: 0.75rem;
    }
    
    .invite-box {
        flex-direction: column;
    }
    
    .invite-box .btn-action {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
    
    .file-details {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
    
    .monitor-header {
        flex-direction: column;
        gap: 0.25rem;
        align-items: flex-start;
    }
}