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

:root {
    --primary-blue: #0F52BA;
    --secondary-blue: #0096FF;
    --dark-bg: #0a0e1a;
    --panel-bg: #151923;
    --panel-border: #1e2838;
    --text-primary: #e8f1ff;
    --text-secondary: #8b9dc3;
    --glow-primary: rgba(15, 82, 186, 0.6);
    --glow-secondary: rgba(0, 150, 255, 0.6);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, #0a0e1a 0%, #1a1f2e 50%, #0a0e1a 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    overflow-x: hidden;
    position: relative;
}

/* Animated stars background */
.stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.star {
    position: absolute;
    width: 2px;
    height: 2px;
    background: white;
    border-radius: 50%;
    animation: twinkle 3s infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 1; }
}

/* Main container */
.radio-container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    width: 100%;
}

/* Radio panel */
.radio-panel {
    background: linear-gradient(145deg, var(--panel-bg) 0%, #0f1419 100%);
    border-radius: 20px;
    border: 2px solid var(--panel-border);
    padding: 2rem;
    box-shadow:
        0 0 0 1px rgba(0, 150, 255, 0.1),
        0 20px 60px rgba(0, 0, 0, 0.8),
        0 0 80px rgba(15, 82, 186, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
    animation: panelGlow 4s ease-in-out infinite;
}

@keyframes panelGlow {
    0%, 100% {
        box-shadow:
            0 0 0 1px rgba(0, 150, 255, 0.1),
            0 20px 60px rgba(0, 0, 0, 0.8),
            0 0 80px rgba(15, 82, 186, 0.2),
            inset 0 1px 0 rgba(255, 255, 255, 0.05);
    }
    50% {
        box-shadow:
            0 0 0 1px rgba(0, 150, 255, 0.2),
            0 20px 60px rgba(0, 0, 0, 0.8),
            0 0 100px rgba(0, 150, 255, 0.3),
            inset 0 1px 0 rgba(255, 255, 255, 0.05);
    }
}

.radio-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue), var(--primary-blue));
    background-size: 200% 100%;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Panel top */
.panel-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--panel-border);
}

.brand {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--secondary-blue);
    letter-spacing: 3px;
    text-shadow: 0 0 10px var(--glow-secondary);
}

.status-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-led {
    width: 10px;
    height: 10px;
    background: var(--secondary-blue);
    border-radius: 50%;
    box-shadow:
        0 0 5px var(--secondary-blue),
        0 0 10px var(--secondary-blue),
        0 0 15px var(--glow-secondary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.95); }
}

.status-text {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--secondary-blue);
    letter-spacing: 2px;
    text-shadow: 0 0 5px var(--glow-secondary);
}

/* Frequency section */
.frequency-section {
    background: #0a0e14;
    padding: 1.5rem;
    border-radius: 12px;
    border: 2px solid var(--panel-border);
    margin-bottom: 1.5rem;
    box-shadow:
        inset 0 2px 8px rgba(0, 0, 0, 0.6),
        0 0 20px rgba(15, 82, 186, 0.1);
    text-align: center;
}

.frequency-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.frequency-display {
    font-family: 'Courier New', monospace;
    margin-bottom: 1rem;
}

.freq-digits {
    font-size: 4rem;
    font-weight: 700;
    color: var(--secondary-blue);
    text-shadow:
        0 0 15px var(--secondary-blue),
        0 0 30px var(--secondary-blue),
        0 0 45px var(--primary-blue);
    letter-spacing: 0.3rem;
    display: inline-block;
    animation: digitGlow 2s ease-in-out infinite;
}

@keyframes digitGlow {
    0%, 100% {
        text-shadow:
            0 0 15px var(--secondary-blue),
            0 0 30px var(--secondary-blue),
            0 0 45px var(--primary-blue);
    }
    50% {
        text-shadow:
            0 0 20px var(--secondary-blue),
            0 0 40px var(--secondary-blue),
            0 0 60px var(--primary-blue);
    }
}

.freq-unit {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

.mode-display {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.mode-value,
.band-value {
    color: var(--primary-blue);
    font-weight: 600;
    margin-left: 0.3rem;
}

/* Waterfall container */
.waterfall-container {
    background: #0a0e14;
    padding: 1rem;
    border-radius: 12px;
    border: 2px solid var(--panel-border);
    margin-bottom: 1.5rem;
    box-shadow:
        inset 0 2px 8px rgba(0, 0, 0, 0.6),
        0 0 20px rgba(0, 150, 255, 0.1);
}

.waterfall-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.waterfall-title {
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 2px;
    font-weight: 600;
}

.signal-meter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.meter-label {
    font-size: 0.65rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.meter-bars {
    display: flex;
    gap: 3px;
}

.meter-bar {
    width: 4px;
    height: 16px;
    background: #1a2030;
    border-radius: 2px;
    transition: all 0.2s ease;
}

.meter-bar.active {
    background: linear-gradient(to top, var(--primary-blue), var(--secondary-blue));
    box-shadow: 0 0 8px var(--glow-secondary);
}

#waterfall {
    width: 100%;
    height: auto;
    max-height: 300px;
    border-radius: 8px;
    border: 1px solid var(--panel-border);
    display: block;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.freq-markers {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

/* Operator section */
.operator-section {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: rgba(15, 82, 186, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(0, 150, 255, 0.1);
}

.callsign-display {
    font-family: 'Courier New', monospace;
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--secondary-blue);
    text-shadow:
        0 0 20px var(--secondary-blue),
        0 0 40px var(--primary-blue);
    letter-spacing: 0.5rem;
    margin-bottom: 0.5rem;
    animation: callsignPulse 3s ease-in-out infinite;
}

@keyframes callsignPulse {
    0%, 100% {
        text-shadow:
            0 0 20px var(--secondary-blue),
            0 0 40px var(--primary-blue);
    }
    50% {
        text-shadow:
            0 0 30px var(--secondary-blue),
            0 0 60px var(--primary-blue),
            0 0 80px var(--primary-blue);
    }
}

.operator-name {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
    font-weight: 500;
}

.operator-title {
    font-size: 0.9rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

/* Controls panel */
.controls-panel {
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: rgba(10, 14, 20, 0.5);
    border-radius: 12px;
    border: 1px solid var(--panel-border);
}

.control-group {
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 2rem;
}

.knob {
    position: relative;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, #2a3040 0%, #1a1f2e 100%);
    border-radius: 50%;
    border: 3px solid var(--panel-border);
    cursor: grab;
    transition: all 0.2s ease;
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.6),
        inset 0 -2px 8px rgba(0, 0, 0, 0.4),
        inset 0 2px 4px rgba(255, 255, 255, 0.05);
}

.knob:hover {
    border-color: var(--primary-blue);
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.6),
        0 0 20px var(--glow-primary),
        inset 0 -2px 8px rgba(0, 0, 0, 0.4),
        inset 0 2px 4px rgba(255, 255, 255, 0.05);
}

.knob-indicator {
    position: absolute;
    top: 10%;
    left: 50%;
    width: 4px;
    height: 35%;
    background: var(--secondary-blue);
    transform-origin: bottom center;
    transform: translateX(-50%);
    border-radius: 2px;
    box-shadow: 0 0 8px var(--glow-secondary);
}

.knob-label {
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
    white-space: nowrap;
}

.power-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.power-icon {
    width: 70px;
    height: 70px;
    background: radial-gradient(circle, var(--primary-blue) 0%, #0a3080 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    border: 3px solid var(--secondary-blue);
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.6),
        0 0 20px var(--glow-primary),
        inset 0 -2px 8px rgba(0, 0, 0, 0.4);
    transition: all 0.3s ease;
}

.power-button:hover .power-icon {
    background: radial-gradient(circle, var(--secondary-blue) 0%, var(--primary-blue) 100%);
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.6),
        0 0 30px var(--glow-secondary),
        inset 0 -2px 8px rgba(0, 0, 0, 0.4);
    transform: scale(1.05);
}

.power-button:active .power-icon {
    transform: scale(0.95);
}

.power-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

/* Links section */
.links-section {
    margin-bottom: 1.5rem;
}

.links-header {
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 3px;
    margin-bottom: 1rem;
    text-align: center;
    font-weight: 600;
}

.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1rem;
    background: linear-gradient(135deg, rgba(15, 82, 186, 0.1), rgba(0, 150, 255, 0.05));
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    color: var(--secondary-blue);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 150, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.social-link:hover::before {
    left: 100%;
}

.social-link:hover {
    background: linear-gradient(135deg, rgba(15, 82, 186, 0.2), rgba(0, 150, 255, 0.1));
    border-color: var(--secondary-blue);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.4),
        0 0 20px var(--glow-secondary);
}

.link-icon {
    font-size: 1.2rem;
    min-width: 24px;
    text-align: center;
}

/* Footer */
.panel-footer {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid var(--panel-border);
}

.footer-text {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    letter-spacing: 3px;
    margin-bottom: 0.3rem;
}

.qth {
    font-size: 0.7rem;
    color: var(--text-secondary);
    opacity: 0.6;
}

/* Responsive design */
@media (max-width: 768px) {
    .radio-panel {
        padding: 1.5rem;
    }

    .freq-digits {
        font-size: 2.5rem;
        letter-spacing: 0.2rem;
    }

    .callsign-display {
        font-size: 2.5rem;
        letter-spacing: 0.3rem;
    }

    .control-group {
        gap: 1rem;
    }

    .knob {
        width: 60px;
        height: 60px;
    }

    .power-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .social-grid {
        grid-template-columns: 1fr;
    }

    #waterfall {
        max-height: 200px;
    }
}

@media (max-width: 480px) {
    .freq-digits {
        font-size: 2rem;
    }

    .callsign-display {
        font-size: 2rem;
        letter-spacing: 0.2rem;
    }

    .panel-top {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
}

/* Power off state */
body.powered-off .radio-panel {
    opacity: 0.3;
    pointer-events: none;
}

body.powered-off .status-led,
body.powered-off .freq-digits,
body.powered-off .callsign-display {
    animation: none;
    text-shadow: none;
    box-shadow: none;
}