/* 全局样式 */
:root {
    --primary-bg: #0a0a0a;
    --secondary-bg: #1a1a2e;
    --accent-cyan: #00d4ff;
    --accent-blue: #0099cc;
    --accent-purple: #8b5cf6;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: var(--primary-bg);
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--text-primary);
    user-select: none;
}

/* Canvas 容器 */
#canvas-container {
    width: 100%;
    height: 100vh;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

/* 浏览器不支持提示 */
#browser-not-supported {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--secondary-bg);
    padding: 40px;
    border-radius: 10px;
    border: 2px solid var(--accent-cyan);
    z-index: 1000;
    text-align: center;
    max-width: 500px;
}

#browser-not-supported.show {
    display: block;
}

/* 加载提示 */
#loading {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 100;
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* UI 层 */
#ui-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

/* 顶部控制栏 */
#top-bar {
    position: absolute;
    top: 20px;
    left: 20px;
    pointer-events: auto;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 15px 25px;
    min-width: 220px;
}

.brand-link {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--accent-cyan);
    text-decoration: none;
    margin-bottom: 6px;
    opacity: 0.85;
    transition: opacity 0.2s;
}

.brand-link:hover {
    opacity: 1;
    text-decoration: underline;
}

#top-bar h1 {
    font-size: 1.6rem;
    margin-bottom: 10px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.level-indicator {
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

#current-level-name {
    font-weight: bold;
    color: var(--accent-cyan);
}

.level-progress {
    margin-top: 12px;
    height: 3px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

#level-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 2px;
    transition: width 0.4s ease;
}

/* 层级导航 */
#level-navigation {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    pointer-events: auto;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 10px;
    flex-wrap: nowrap;
    justify-content: flex-start;
    max-width: min(96%, 1100px);
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-cyan) transparent;
}

#level-navigation::-webkit-scrollbar {
    height: 4px;
}

#level-navigation::-webkit-scrollbar-thumb {
    background: var(--accent-cyan);
    border-radius: 2px;
}

.level-btn {
    padding: 8px 14px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.level-btn:hover {
    background: var(--accent-cyan);
    color: var(--primary-bg);
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
}

.level-btn.active {
    background: var(--accent-cyan);
    color: var(--primary-bg);
    border-color: var(--accent-cyan);
}

/* 控制按钮 */
#controls {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: auto;
}

#controls button {
    padding: 10px 18px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 5px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    text-align: left;
}

#controls button:hover:not(:disabled) {
    background: var(--accent-cyan);
    color: var(--primary-bg);
    border-color: var(--accent-cyan);
}

#controls button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

#hint-toast {
    position: absolute;
    bottom: 90px;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 8px 18px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 1;
    transition: opacity 0.6s ease;
    white-space: nowrap;
}

#hint-toast.fade-out {
    opacity: 0;
}

/* 信息面板 */
#info-panel {
    position: fixed;
    right: -400px;
    top: 0;
    width: 380px;
    height: 100vh;
    background: rgba(26, 26, 46, 0.92);
    backdrop-filter: blur(14px);
    border-left: 1px solid var(--glass-border);
    z-index: 20;
    pointer-events: auto;
    transition: right 0.3s ease;
    overflow-y: auto;
    padding: 20px;
}

#info-panel.show {
    right: 0;
}

.info-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.info-header h2 {
    font-size: 1.4rem;
    color: var(--accent-cyan);
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s ease;
}

.close-btn:hover {
    color: var(--accent-cyan);
}

.info-section {
    margin-bottom: 25px;
}

.info-section h3 {
    font-size: 1.05rem;
    color: var(--accent-purple);
    margin-bottom: 12px;
}

#info-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

#info-table td {
    padding: 8px;
    border-bottom: 1px solid var(--border-color);
}

#info-table td:first-child {
    color: var(--text-secondary);
    width: 40%;
}

#info-table td:last-child {
    color: var(--text-primary);
    font-weight: 500;
}

#info-description,
#info-evolution {
    color: var(--text-secondary);
    line-height: 1.65;
    font-size: 0.9rem;
}

/* 帮助面板 */
.overlay-panel {
    position: fixed;
    inset: 0;
    z-index: 30;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    pointer-events: auto;
}

.overlay-panel[hidden] {
    display: none;
}

.overlay-card {
    background: rgba(26, 26, 46, 0.96);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 24px;
    max-width: 420px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

.help-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 18px;
}

.help-list li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.help-list kbd {
    display: inline-block;
    min-width: 1.6em;
    padding: 2px 7px;
    margin-right: 2px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.06);
    color: var(--accent-cyan);
    font-size: 0.8rem;
    text-align: center;
    font-family: inherit;
}

.help-foot {
    font-size: 0.78rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    #top-bar {
        top: 10px;
        left: 10px;
        padding: 10px 14px;
        min-width: 160px;
    }

    #top-bar h1 {
        font-size: 1.15rem;
    }

    .level-indicator {
        font-size: 0.8rem;
    }

    #controls {
        top: 10px;
        right: 10px;
        gap: 5px;
    }

    #controls button {
        padding: 7px 10px;
        font-size: 0.72rem;
    }

    #level-navigation {
        bottom: 10px;
        padding: 8px;
        gap: 5px;
    }

    .level-btn {
        padding: 6px 10px;
        font-size: 0.7rem;
    }

    #hint-toast {
        bottom: 72px;
        font-size: 0.7rem;
        padding: 6px 12px;
        white-space: normal;
        text-align: center;
        max-width: 90%;
    }

    #info-panel {
        width: 100%;
        right: -100%;
    }

    #info-panel.show {
        right: 0;
    }
}