.modal-content button,
.modal-content .radio-button {
    display: block;
    margin: 24px auto 0 auto;
    min-width: 120px;
    max-width: 80%;
    text-align: center;
}
/* 基础样式与变量 */
:root {
    --radio-bg: #121a29;
    --panel-bg: #0a101f;
    --border-color: #2d4263;
    --accent-color: #c8a951;
    --text-color: #e2e8f0;
    --glow-green: rgba(0, 255, 0, 0.7);
    --glow-red: rgba(255, 50, 50, 0.8);
    --glow-yellow: rgba(255, 215, 0, 0.8);
    --knob-bg: #1e293b;
    --knob-border: #475569;
    --slider-track: #1e293b;
    --slider-fill: #c8a951;
    --button-bg: #2d3748;
    --button-hover: #4a5568;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Courier New', Courier, monospace;
}

body {
    background-color: #0f172a;
    color: var(--text-color);
    padding: 20px;
    line-height: 1.6;
}

/* 电台容器 */
.radio-container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--radio-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    position: relative;
}

/* 顶部标题区域 */
.radio-header {
    background-color: var(--panel-bg);
    padding: 15px 20px;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.radio-header h1 {
    color: var(--accent-color);
    font-size: 1.5rem;
    text-shadow: 0 0 5px rgba(200, 169, 81, 0.5);
}

/* 连接状态 */
#connectionStatus {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    padding: 5px 10px;
    border-radius: 4px;
    background-color: rgba(30, 41, 59, 0.5);
}

#connectionStatus i {
    margin-right: 5px;
    font-size: 0.8rem;
}

.status-connected i {
    color: #10b981;
}

.status-disconnected i {
    color: #ef4444;
}

/* 主显示区域 */
.main-display {
    padding: 20px;
    background-color: var(--radio-bg);
}

/* 频谱瀑布图容器 */
.waterfall-container {
    position: relative;
    height: 300px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    background-color: #050a1a;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.7);
}

#waterfallCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* 频谱上的频率标记 */
.waterfall-markers {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

/* 中心频率指示红线 - 降低透明度 */
.frequency-indicator {
    position: absolute;
    top: 0;
    width: 2px;
    height: 100%;
    background-color: var(--glow-red);
    box-shadow: 0 0 5px var(--glow-red), 0 0 10px var(--glow-red);
    opacity: 0.3; /* 降低透明度，使信号线更显眼 */
    z-index: 5;
    transform: translateX(-50%);
}

/* 频率刻度 */
.frequency-scale {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 20px;
    display: flex;
    align-items: flex-end;
    padding: 0 10px;
    color: var(--glow-green);
    z-index: 10;
    background-color: rgba(5, 10, 26, 0.8);
    white-space: nowrap;
}

.scale-marker {
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-right: 20px;
}

.scale-marker::before {
    content: '';
    width: 1px;
    height: 8px;
    background-color: var(--glow-green);
}

.scale-marker span {
    font-size: 11px;
    text-shadow: 0 0 3px var(--glow-green);
    position: absolute;
    bottom: -15px;
}

/* 频率显示 */
.frequency-display {
    margin-top: 15px;
    padding: 10px;
    background-color: var(--panel-bg);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    text-align: center;
}

#frequencyDigits {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--glow-green);
    text-shadow: 0 0 5px var(--glow-green), 0 0 10px var(--glow-green);
    letter-spacing: 2px;
}

/* 控制面板 */
.control-panel {
    display: flex;
    padding: 20px;
    background-color: var(--panel-bg);
    border-top: 2px solid var(--border-color);
    gap: 20px;
}

.control-section {
    flex: 1;
}

/* 控制组通用样式 */
.control-group {
    margin-bottom: 25px;
}

.control-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--accent-color);
}

/* 波段选择 */
.band-select {
    width: 100%;
    padding: 8px 12px;
    background-color: var(--radio-bg);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    font-size: 0.9rem;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23e2e8f0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 16px;
}

.band-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* 音量和音调旋钮并排显示 */
.knob-controls-row {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 20px;
}

/* 旋钮控制 */
.knob-control {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.knob-container {
    position: relative;
    margin-bottom: 15px;
}

/* 旋钮大小设置 - 增大所有旋钮尺寸 */
.large-knob {
    width: 180px;
    height: 180px;
}

.medium-knob {
    width: 140px;
    height: 140px;
}

.knob {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #2d3748, #1a202c);
    border: 4px solid var(--knob-border);
    box-shadow: 
        0 0 10px rgba(0, 0, 0, 0.5),
        inset 0 0 10px rgba(0, 0, 0, 0.7),
        inset 0 2px 2px rgba(255, 255, 255, 0.1);
    position: relative;
    cursor: grab;
    transition: transform 0.05s ease-out;
}

.knob:active {
    cursor: grabbing;
    box-shadow: 
        0 0 10px rgba(200, 169, 81, 0.3),
        inset 0 0 10px rgba(0, 0, 0, 0.7),
        inset 0 2px 2px rgba(255, 255, 255, 0.1);
}

.knob-marker {
    position: absolute;
    top: 10px;
    left: 50%;
    width: 3px;
    height: 15px;
    background-color: var(--accent-color);
    transform: translateX(-50%);
    box-shadow: 0 0 5px rgba(200, 169, 81, 0.8);
}

.knob::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: #121a29;
    border: 2px solid var(--knob-border);
    transform: translate(-50%, -50%);
    box-shadow: inset 0 0 3px rgba(0, 0, 0, 0.5);
}

/* 发报键 */
.key-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.morse-key {
    width: 120px;
    height: 120px;
    position: relative;
    margin: 10px 0 20px;
}

/* 双桨自动键UI */
.paddle-keyer { margin: 8px 0 16px; }

.paddles {
    position: relative;
    width: 80px;
    height: 150px;
    display: flex;
    border: none; 
    border-radius: 10px;
    overflow: visible;
    box-shadow: none;
    background: transparent;
    cursor: pointer;
}

.paddles .paddle.half {
    flex: 1;
    position: relative;
}

.paddles .paddle.left { border-right: none; }
.paddles .paddle.right { border-left: none; }

.paddles .paddle.left::after,
.paddles .paddle.right::after {
    content: '';
    position: absolute;
    top: 2%;
    width: 45%;
    height: 96%;
    background: radial-gradient(circle at 30% 20%, #4b5563, #111827);
    border: 2px solid var(--border-color);
    border-radius: 50% 50% 65% 65% / 85% 85% 70% 70%;
    box-shadow: inset 0 2px 4px rgba(255,255,255,0.06), 0 4px 10px rgba(0,0,0,0.5);
    transition: transform 120ms ease;
    transform-origin: 50% 0%; /* 顶部为旋转中心 */
}
.paddles .paddle.left::after { left: 1%; right: auto; transform: rotate(2deg); }
.paddles .paddle.right::after { right: 1%; left: auto; transform: rotate(-2deg); }

.paddles .paddle.active { background-color: rgba(51,65,85,0.35); }

.paddles .paddle.left.active::after { transform: rotate(-8deg); }
.paddles .paddle.right.active::after { transform: rotate(8deg); }

.key-top {
    width: 100%;
    height: 60px;
    background: radial-gradient(circle at 50% 30%, #4a5568, #1a202c);
    border: 3px solid var(--border-color);
    border-radius: 8px 8px 50% 50%;
    position: relative;
    box-shadow: 
        0 4px 6px rgba(0, 0, 0, 0.5),
        inset 0 2px 2px rgba(255, 255, 255, 0.1);
    transition: all 0.1s ease;
    cursor: pointer;
}

.key-top::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 20px;
    background-color: #121a29;
    border: 2px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 4px 4px;
}

.morse-key.key-press .key-top {
    transform: translateY(5px);
    box-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.5),
        inset 0 2px 2px rgba(0, 0, 0, 0.3);
    background: radial-gradient(circle at 50% 30%, #374151, #111827);
}

.key-hint {
    font-size: 0.85rem;
    color: var(--text-color);
    text-align: center;
}

/* 按钮组 */
.button-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.radio-button {
    background-color: var(--button-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    padding: 8px 12px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.radio-button:hover {
    background-color: var(--button-hover);
    border-color: var(--accent-color);
}

.radio-button:active {
    transform: translateY(1px);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.search-button {
    background-color: #1e3a8a;
}

.search-button:hover {
    background-color: #3b82f6;
}

/* 静音按钮特殊样式 */
.mute-button {
    margin-top: 10px;
    width: 100px;
}

/* 模式开关与WPM */
.toggle-row {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
}

.switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--slider-track);
    border: 2px solid var(--border-color);
    -webkit-transition: .2s;
    transition: .2s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 2px;
    background-color: var(--accent-color);
    -webkit-transition: .2s;
    transition: .2s;
}

input:checked + .slider {
    background-color: #1e3a8a;
}

input:checked + .slider:before {
    -webkit-transform: translateX(22px);
    -ms-transform: translateX(22px);
    transform: translateX(22px);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

.wpm-slider {
    width: 100%;
    accent-color: var(--accent-color);
}

/* 模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    pointer-events: auto;
    z-index: 9999;
    padding: 32px 0;
    box-sizing: border-box;
}

.modal:not(.show) {
    display: none !important;
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background-color: var(--panel-bg);
    border: 2px solid var(--accent-color);
    border-radius: 10px;
    padding: 32px 24px 24px 24px;
    width: 100%;
    max-width: 420px;
    min-width: 260px;
    text-align: center;
    box-shadow: 0 0 24px rgba(200, 169, 81, 0.3);
    margin: 0 16px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.modal-content h3 {
    color: var(--accent-color);
    margin-bottom: 20px;
}

/* 噪声控制滑块样式 */
.noise-controls {
    background-color: var(--panel-bg); /* 使用面板统一背景色 */
    padding: 15px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    margin-top: 20px;
}

.noise-controls .control-row {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    gap: 10px;
}

.noise-controls label {
    color: var(--accent-color);
    font-size: 0.9rem;
    width: 120px; /* 固定标签宽度 */
}

.noise-controls input[type="range"] {
    flex: 1; /* 自适应剩余宽度 */
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--slider-track);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    outline: none;
}

.noise-controls input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: 1px solid var(--knob-border);
    box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
}

.noise-controls input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: 1px solid var(--knob-border);
    box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
}
/* 进度条 */
.progress-bar {
    height: 8px;
    background-color: var(--slider-track);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 15px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 0.3s ease;
}

/* 工具类 */
.hidden {
    display: none !important;
}

/* 动画 */
@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

@keyframes blink {
    0% { opacity: 0.4; }
    50% { opacity: 1; }
    100% { opacity: 0.4; }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .control-panel {
        flex-direction: column;
    }
    
    .control-section {
        width: 100%;
    }
    
    /* Reorder control sections for small screens */
    .control-section.key-section {
        order: 1; /* Morse key and mode toggle at the top */
    }
    
    .control-section.frequency-section {
        order: 2; /* Frequency knob below morse key */
    }
    
    .control-section.knobs-section {
        order: 3; /* Volume and tone knobs at the bottom */
    }
    
    .knob-controls-row {
        justify-content: space-around;
    }
    
    .button-group {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .radio-button {
        flex: 1;
        min-width: 120px;
    }
    
    .frequency-display {
        padding: 8px;
    }
    
    #frequencyDigits {
        font-size: 1.5rem;
    }
    
    /* 响应式调整旋钮大小 */
    .large-knob {
        width: 150px;
        height: 150px;
    }
    
    .medium-knob {
        width: 120px;
        height: 120px;
    }
}