/* ============================================
   主站点样式 - 数字胡焕庸线沉浸式体验
   ============================================ */

:root {
    /* 主题色彩系统 */
    --color-bg-primary: #0a0e1a;
    --color-bg-secondary: #121826;
    --color-bg-tertiary: #1a2332;
    
    --color-accent-cyan: #00ffff;
    --color-accent-blue: #0066ff;
    --color-accent-gold: #ffd700;
    --color-accent-orange: #ff6b35;
    --color-accent-green: #00ff88;
    
    --color-text-primary: rgba(255, 255, 255, 0.95);
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-muted: rgba(255, 255, 255, 0.5);
    
    /* 导航栏样式 */
    --nav-height: 80px;
    --nav-bg: rgba(10, 14, 26, 0.95);
    --nav-border: rgba(0, 255, 255, 0.2);
    --nav-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    
    /* 动画曲线 */
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
    --ease-in-out-circ: cubic-bezier(0.85, 0, 0.15, 1);
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "Segoe UI", sans-serif;
    background: radial-gradient(ellipse at top, var(--color-bg-secondary), var(--color-bg-primary));
    color: var(--color-text-primary);
}

/* ============================================
   全局导航栏
   ============================================ */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--nav-border);
    box-shadow: var(--nav-shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    z-index: 1000;
    transition: all 0.3s var(--ease-out-expo);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--color-accent-cyan);
    text-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
}

.brand-icon {
    font-size: 28px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

/* 进度条 */
.nav-progress {
    flex: 1;
    max-width: 600px;
    margin: 0 40px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, 
        var(--color-accent-cyan) 0%, 
        var(--color-accent-blue) 50%, 
        var(--color-accent-gold) 100%);
    width: 0%;
    transition: width 0.6s var(--ease-in-out-circ);
    box-shadow: 0 0 10px var(--color-accent-cyan);
}

/* 章节导航 */
.nav-chapters {
    display: flex;
    gap: 8px;
    flex: 2;
    justify-content: center;
}

.chapter-btn {
    position: relative;
    padding: 10px 20px;
    background: transparent;
    border: 1px solid rgba(0, 255, 255, 0.2);
    color: var(--color-text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s var(--ease-out-expo);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-width: 120px;
}

.chapter-btn:hover {
    background: rgba(0, 255, 255, 0.1);
    border-color: var(--color-accent-cyan);
    color: var(--color-text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 255, 255, 0.2);
}

.chapter-btn.active {
    background: rgba(0, 255, 255, 0.15);
    border-color: var(--color-accent-cyan);
    color: var(--color-accent-cyan);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}

.chapter-num {
    font-size: 10px;
    letter-spacing: 1px;
    opacity: 0.7;
}

.chapter-name {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 1px;
}

/* 控制按钮 */
.nav-controls {
    display: flex;
    gap: 12px;
}

.control-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 255, 255, 0.2);
    color: var(--color-accent-cyan);
    cursor: pointer;
    transition: all 0.3s var(--ease-out-expo);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.control-btn:hover {
    background: rgba(0, 255, 255, 0.2);
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.4);
}

/* ============================================
   场景容器
   ============================================ */
.scene-container {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--nav-height));
    overflow: hidden;
    opacity: 1;
    filter: none;
    transition: opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1),
                filter 0.65s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, filter;
}

.scene-container.is-transitioning {
    opacity: 0.22;
    filter: blur(3px) saturate(1.08);
}

.scene {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s var(--ease-in-out-circ), visibility 0.6s;
}

.scene.active {
    opacity: 1;
    visibility: visible;
    z-index: 10;
}

.scene iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ============================================
   转场动画
   ============================================ */
.transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, 
        rgba(0, 255, 255, 0.1) 0%, 
        rgba(10, 14, 26, 0.98) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.55s cubic-bezier(0.22, 1, 0.36, 1),
                visibility 0.55s;
}

.transition-overlay.active {
    opacity: 1;
    visibility: visible;
}

.transition-content {
    text-align: center;
}

.transition-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(0, 255, 255, 0.2);
    border-top-color: var(--color-accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}

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

.transition-text {
    font-size: 18px;
    letter-spacing: 3px;
    color: var(--color-accent-cyan);
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
}

/* ============================================
   首屏加载提示
   ============================================ */
.intro-loader {
    position: fixed;
    inset: 0;
    z-index: 2500;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center,
        rgba(0, 255, 255, 0.08) 0%,
        rgba(10, 14, 26, 0.96) 100%);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s var(--ease-out-expo), visibility 0.4s;
}

.intro-loader.active {
    opacity: 1;
    visibility: visible;
}

.intro-loader-card {
    width: min(520px, 90vw);
    padding: 28px 32px;
    background: rgba(18, 24, 38, 0.92);
    border: 1px solid var(--color-accent-cyan);
    border-radius: 16px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.6),
                0 0 30px rgba(0, 255, 255, 0.2);
    text-align: center;
}

.intro-loader-title {
    font-size: 20px;
    color: var(--color-accent-cyan);
    letter-spacing: 2px;
    margin-bottom: 18px;
}

.intro-loader-bar {
    width: 100%;
    height: 8px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.intro-loader-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg,
        var(--color-accent-cyan),
        var(--color-accent-blue),
        var(--color-accent-gold));
    box-shadow: 0 0 12px rgba(0, 255, 255, 0.5);
    transition: width 0.2s ease;
}

.intro-loader-meta {
    display: flex;
    justify-content: space-between;
    margin-top: 12px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.intro-loader-skip {
    margin-top: 18px;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid rgba(0, 255, 255, 0.4);
    background: rgba(0, 255, 255, 0.08);
    color: var(--color-accent-cyan);
    cursor: pointer;
    transition: all 0.3s var(--ease-out-expo);
}

.intro-loader-skip:hover {
    background: rgba(0, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* ============================================
   引导面板
   ============================================ */

/* ???? */
.scene-container.is-transitioning iframe {
    animation: sceneFadeOut 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes sceneFadeOut {
    0% { opacity: 1; transform: scale(1); }
    100% { opacity: 0.15; transform: scale(1.015); }
}

.transition-overlay.active .transition-content {
    animation: transitionPop 0.8s cubic-bezier(0.19, 1, 0.22, 1) both;
}

@keyframes transitionPop {
    0% { opacity: 0; transform: translateY(14px) scale(0.97); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}

.guide-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: min(600px, 90vw);
    max-height: 80vh;
    overflow-y: auto;
    background: rgba(18, 24, 38, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-accent-cyan);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7),
                0 0 40px rgba(0, 255, 255, 0.2);
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s var(--ease-out-expo);
}

.guide-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.guide-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--color-text-primary);
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s var(--ease-out-expo);
    display: flex;
    align-items: center;
    justify-content: center;
}

.guide-close:hover {
    background: rgba(0, 255, 255, 0.2);
    transform: rotate(90deg);
}

.guide-panel h3 {
    font-size: 28px;
    color: var(--color-accent-cyan);
    margin-bottom: 20px;
    text-align: center;
    letter-spacing: 2px;
    text-shadow: 0 0 15px rgba(0, 255, 255, 0.5);
}

.guide-content p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    text-align: center;
}

.guide-content h4 {
    font-size: 18px;
    color: var(--color-accent-gold);
    margin: 24px 0 12px;
    letter-spacing: 1px;
}

.guide-content ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 16px;
}

.guide-content li {
    padding: 8px 0;
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.guide-content kbd {
    display: inline-block;
    padding: 4px 10px;
    font-size: 13px;
    font-family: monospace;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: var(--color-accent-cyan);
    margin: 0 4px;
}

.guide-hint {
    margin-top: 30px;
    text-align: center;
    font-size: 14px;
    color: var(--color-text-muted);
    animation: fadeInOut 2s ease-in-out infinite;
}

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

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .main-nav {
        padding: 0 20px;
    }
    
    .nav-chapters {
        gap: 4px;
    }
    
    .chapter-btn {
        min-width: 80px;
        padding: 8px 12px;
    }
    
    .chapter-num {
        font-size: 9px;
    }
    
    .chapter-name {
        font-size: 10px;
    }
}

@media (max-width: 768px) {
    .main-nav {
        flex-wrap: wrap;
        height: auto;
        padding: 16px 20px;
        gap: 12px;
    }
    
    .nav-brand {
        font-size: 16px;
    }
    
    .nav-progress {
        order: 3;
        width: 100%;
        margin: 0;
    }
    
    .nav-chapters {
        order: 2;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-controls {
        order: 1;
    }
    
    .scene-container {
        top: calc(var(--nav-height) + 60px);
        height: calc(100vh - var(--nav-height) - 60px);
    }
}

/* ============================================
   辅助类
   ============================================ */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.6s var(--ease-out-expo);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}


/* ============================================
   ???????
   ============================================ */
.handcam {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 220px;
    height: 165px;
    background: rgba(0, 0, 0, 0.75);
    border: 1px solid rgba(0, 255, 255, 0.4);
    border-radius: 10px;
    overflow: hidden;
    z-index: 1500;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
}

.handcam.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.handcam video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1);
    position: absolute;
    inset: 0;
}

.handcam-header {
    position: absolute;
    top: 6px;
    left: 8px;
    right: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 3;
}

.handcam-label {
    padding: 3px 8px;
    font-size: 12px;
    letter-spacing: 1px;
    color: var(--color-text-primary);
    background: rgba(0, 0, 0, 0.6);
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.handcam-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ff4d4f;
    box-shadow: 0 0 10px rgba(255, 77, 79, 0.8);
}

.handcam-sub {
    position: absolute;
    top: 34px;
    left: 8px;
    right: 8px;
    padding: 6px 8px;
    font-size: 12px;
    line-height: 1.4;
    color: var(--color-text-secondary);
    background: rgba(0, 0, 0, 0.55);
    border-radius: 6px;
    z-index: 2;
}

.handcam-action {
    position: absolute;
    left: 8px;
    right: 8px;
    bottom: 8px;
    padding: 8px 10px;
    font-size: 12px;
    color: #ffffff;
    border-radius: 999px;
    border: 1px solid rgba(0, 255, 255, 0.6);
    background: rgba(0, 255, 255, 0.2);
    cursor: pointer;
    z-index: 3;
    transition: all 0.3s var(--ease-out-expo);
}

.handcam-action:hover {
    background: rgba(0, 255, 255, 0.35);
    transform: translateY(-1px);
}

.handcam.status-red .handcam-dot {
    background: #ff4d4f;
    box-shadow: 0 0 12px rgba(255, 77, 79, 0.9);
}

.handcam.status-yellow .handcam-dot {
    background: #f7b500;
    box-shadow: 0 0 12px rgba(247, 181, 0, 0.9);
}

.handcam.status-green .handcam-dot {
    background: #00d27a;
    box-shadow: 0 0 12px rgba(0, 210, 122, 0.9);
}