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

:root {
    --primary-color: #FFA300;
    --secondary-color: #FFA300;
    --dark-bg: #2a2c24;
    --card-bg: #3a3d32;
    --text-primary: #F6EDDD;
    --text-secondary: #b8b0a0;
    --border-color: #5a5d4e;
    --success-color: #FFA300;
    --danger-color: #ff4444;
    --glow-color: rgba(255, 163, 0, 0.4);
    --scanline-color: rgba(255, 163, 0, 0.03);
}

html, body {
    width: 100%;
    height: 100%;
    font-family: 'Orbitron', monospace, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    overflow-x: hidden;
}

body {
    display: flex;
    flex-direction: column;
    background-image:
        repeating-linear-gradient(
            0deg,
            var(--scanline-color) 0px,
            var(--scanline-color) 1px,
            transparent 1px,
            transparent 3px
        );
}

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0 auto;
    padding: 0;
    max-width: 600px;
    width: 100%;
}

header {
    background: linear-gradient(135deg, #46493C 0%, #3a3d32 100%);
    padding: 20px;
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    padding-top: max(20px, env(safe-area-inset-top));
    box-shadow: 0 4px 20px rgba(255, 163, 0, 0.15);
}

header h1 {
    font-size: 28px;
    margin-bottom: 5px;
    font-weight: 700;
    letter-spacing: 4px;
    text-transform: uppercase;
    text-shadow: 0 0 10px var(--glow-color), 0 0 20px var(--glow-color);
    color: var(--primary-color);
}

.subtitle {
    font-size: 10px;
    color: var(--text-secondary);
    letter-spacing: 6px;
    text-transform: uppercase;
}

main {
    flex: 1;
    padding: 20px;
    padding-bottom: max(20px, env(safe-area-inset-bottom));
    overflow-y: auto;
}

footer {
    padding: 15px 20px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 9px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Sections */
section {
    margin-bottom: 25px;
}

section h3 {
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--primary-color);
    letter-spacing: 3px;
    text-transform: uppercase;
}

/* Status Section */
.status-section {
    text-align: center;
    padding: 15px;
    background-color: var(--card-bg);
    border-radius: 2px;
    border: 1px solid var(--border-color);
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.3);
}

.status-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 10px;
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--success-color);
    animation: pulse 2s infinite;
    box-shadow: 0 0 8px var(--glow-color);
}

.status-dot.inactive {
    background-color: var(--text-secondary);
    animation: none;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

#statusText {
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.status-message {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 5px 0 0 0;
}

/* Control Section */
.control-section {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    font-family: 'Orbitron', monospace;
    font-size: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--dark-bg);
    border-color: var(--primary-color);
}

.btn-primary:hover:not(:disabled) {
    background-color: #ffb733;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--glow-color);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-tertiary {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-tertiary:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: var(--dark-bg);
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Readings Section */
.readings-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: 12px;
}

.reading-card {
    background-color: var(--card-bg);
    border: 1px solid var(--primary-color);
    border-radius: 2px;
    padding: 15px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.3), 0 0 10px rgba(255, 163, 0, 0.05);
}

.reading-card:hover {
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.3), 0 0 15px var(--glow-color);
}

.reading-label {
    font-size: 8px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 8px;
    font-weight: 600;
}

.reading-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'Orbitron', monospace;
    text-shadow: 0 0 10px var(--glow-color);
}

/* Statistics Section */
.stats-section {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: 15px;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.3);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 2px;
    border-left: 3px solid var(--primary-color);
}

.stat-label {
    font-size: 9px;
    color: var(--text-secondary);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.stat-value {
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'Orbitron', monospace;
}

/* Settings Section */
.settings-section {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: 15px;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.3);
}

.setting-group {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.setting-group label {
    font-size: 9px;
    font-weight: 600;
    flex: 0 0 auto;
    min-width: 140px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

#frequencyInput {
    flex: 1;
    padding: 8px;
    border: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.3);
    color: var(--primary-color);
    border-radius: 2px;
    font-size: 13px;
    font-family: 'Orbitron', monospace;
}

#frequencyInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 8px var(--glow-color);
    background-color: rgba(255, 163, 0, 0.05);
}

.slider {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 2px;
    background: var(--primary-color);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 6px var(--glow-color);
}

.slider::-webkit-slider-thumb:hover {
    background: #ffb733;
    box-shadow: 0 0 12px var(--glow-color);
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 2px;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    box-shadow: 0 0 6px var(--glow-color);
}

.slider::-moz-range-thumb:hover {
    background: #ffb733;
    box-shadow: 0 0 12px var(--glow-color);
}

.setting-group span {
    font-size: 11px;
    color: var(--primary-color);
    font-weight: 600;
    min-width: 50px;
    text-align: right;
    font-family: 'Orbitron', monospace;
}

/* Visualization Section */
.visualization-section {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: 15px;
    text-align: center;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.3);
}

#frequencyCanvas {
    width: 100%;
    height: auto;
    background-color: rgba(0, 0, 0, 0.4);
    border-radius: 2px;
    border: 1px solid var(--border-color);
    display: block;
}

.canvas-label {
    margin-top: 10px;
    font-size: 8px;
    color: var(--text-secondary);
    letter-spacing: 3px;
    text-transform: uppercase;
}

/* Info Section */
.info-section {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: 15px;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.3);
}

.info-section p {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
    font-family: 'Orbitron', monospace;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.feature {
    background-color: rgba(255, 163, 0, 0.05);
    padding: 10px;
    border-radius: 2px;
    border-left: 3px solid var(--primary-color);
    font-size: 9px;
    color: var(--primary-color);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* Responsive */
@media (max-width: 480px) {
    header h1 {
        font-size: 24px;
    }

    .control-section {
        grid-template-columns: 1fr 1fr;
    }

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

    .reading-card {
        padding: 12px;
    }

    .reading-value {
        font-size: 24px;
    }
}

/* Safe Area Support */
@supports (padding: max(0px)) {
    main {
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
    }
}