/* ==============================
   项目18：灯塔光束效果
   Lighthouse Beacon
   ============================== */

/* ========== 全局样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    overflow: hidden;
    background: #000;
}

/* ========== 灯塔场景容器 ========== */
.lighthouse-scene {
    position: relative;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at center, #1a1a2e 0%, #0f0f1a 50%, #000 100%);
    overflow: hidden;
}

/* ========== 背景星星 ========== */
.stars-container {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.star {
    position: absolute;
    background: #fff;
    border-radius: 50%;
    animation: twinkle var(--duration, 3s) ease-in-out infinite;
    opacity: 0;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.2; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.5); }
}

/* ========== 主光束 ========== */
.beam-primary {
    position: absolute;

    /* ========== 🔧 发光中心位置 - 调整这里 ========== */
    /* 当前：右上角 (20%, 80%) */
    /* 垂直位置：top: 0%(顶部) ~ 100%(底部) */
    /* 水平位置：left: 0%(左侧) ~ 100%(右侧) */
    top: 20%;
    left: 120%;
    /* =========================================== */

    width: 250vmax; /* 宽度 */
    height: 250vmax; /* 高度 */
    transform: translate(-50%, -50%);

    background: conic-gradient(
        from 180deg,  /* 🔧 起始角度180度，光束朝向左上方 */

        transparent 0deg,
        transparent 30deg,

        /* ========== 🔧 光的强度 - 调整rgba的第4个值 ========== */
        /* 格式：rgba(红, 绿, 蓝, 透明度) */
        /* 透明度范围：0(完全透明) ~ 1(完全不透明) */
        /* 建议：0.05(很弱) ~ 0.8(很强)，不要超过0.8 */

        rgba(255, 230, 150, 0.1) 180deg,     /* 边缘淡光 - 已减弱 */
        rgba(255, 240, 180, 0.2) 195deg,     /* 中等亮度 - 已减弱 */
        rgba(255, 250, 200, 0.3) 210deg,     /* 核心亮光 - 已减弱 */
        rgba(255, 240, 180, 0.2) 225deg,     /* 中等亮度 - 已减弱 */
        rgba(255, 230, 150, 0.1) 240deg,     /* 边缘淡光 - 已减弱 */

        /* ==================================================== */

        transparent 270deg,
        transparent 360deg
    );
    /* 🔧 在左边60度范围（150-210度）内摆动 */
    animation: swing var(--rotation-speed, 10s) ease-in-out infinite alternate;
    will-change: transform;
    z-index: 2;
}





/* ========== 动画定义 ========== */

/* 🔧 摆动动画 - 在左边60度范围内摆动（150度到210度） */
@keyframes swing {
    from {
        transform: translate(-50%, -50%) rotate(150deg);  /* 左上 */
    }
    to {
        transform: translate(-50%, -50%) rotate(210deg);  /* 左下 */
    }
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes rotate-secondary {
    from { transform: translate(-50%, -50%) rotate(360deg); }
    to { transform: translate(-50%, -50%) rotate(0deg); }
}

@keyframes rotate-tertiary {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.9; }
}

@keyframes glow-pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.6; }
}

/* ========== 控制面板 ========== */
.control-panel {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 20px 30px;
    color: #fff;
    text-align: center;
    z-index: 100;
    min-width: 300px;
}

.control-panel h1 {
    font-size: 1.5rem;
    margin-bottom: 5px;
    background: linear-gradient(135deg, #ffeb3b, #ff9800);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-bottom: 20px;
    font-weight: 300;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.control-group label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    outline: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: #ffeb3b;
    border-radius: 50%;
    cursor: pointer;
}

#speedValue {
    font-size: 0.85rem;
    opacity: 0.8;
    margin-top: 5px;
}

.toggle-btn {
    padding: 8px 20px;
    background: linear-gradient(135deg, rgba(255, 235, 59, 0.2), rgba(255, 152, 0, 0.2));
    border: 1px solid rgba(255, 235, 59, 0.3);
    color: #ffeb3b;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.toggle-btn:hover {
    background: linear-gradient(135deg, rgba(255, 235, 59, 0.3), rgba(255, 152, 0, 0.3));
    border-color: rgba(255, 235, 59, 0.5);
    transform: translateY(-2px);
}