/* -------------------------------------------------------------------------- */
/* 全局样式与变量定义（冷峻科幻、低饱和、硬朗质感） */
/* -------------------------------------------------------------------------- */
:root {
    --bg-color: #0d0f12;
    --card-bg: #14181f;
    --border-color: #262f3d;
    
    /* 恒纪元/正常状态下的主题色：低饱和金色与冰蓝 */
    --accent-color: #c5a059;
    --accent-glow: rgba(197, 160, 89, 0.15);
    --text-primary: #e2e8f0;
    --text-muted: #64748b;
    
    --transition-speed: 0.5s;
}

/* 乱纪元状态下的全局变量覆盖：警报红、高压高亮 */
body.era-chaotic {
    --accent-color: #ca3e3e;
    --accent-glow: rgba(202, 62, 62, 0.2);
    --border-color: #451a1a;
    --card-bg: #1a1313;
}

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

html {
    scroll-behavior: smooth;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

.font-mono {
    font-family: "Courier New", Courier, monospace;
    letter-spacing: 1px;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

#universe-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    transition: background var(--transition-speed);
}

/* -------------------------------------------------------------------------- */
/* 顶部状态栏与纪元切换 */
/* -------------------------------------------------------------------------- */
.status-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 48px;
    background: rgba(13, 15, 18, 0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    z-index: 100;
    transition: border-color var(--transition-speed);
}

.status-indicator {
    display: flex;
    align-items: center;
    font-size: 12px;
    position: relative;
}

.status-label {
    color: var(--text-muted);
    margin-right: 8px;
}

.status-value {
    color: var(--accent-color);
    transition: color var(--transition-speed);
}

.era-switcher {
    display: flex;
    border: 1px solid var(--border-color);
    background: #000;
}

.btn-era {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 6px 16px;
    font-size: 12px;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.3s ease;
}

.btn-era:hover {
    color: var(--text-primary);
}

.btn-era.active {
    background: var(--accent-color);
    color: #000;
    font-weight: bold;
}

/* -------------------------------------------------------------------------- */
/* Hero 首屏 */
/* -------------------------------------------------------------------------- */
.hero-section {
    padding: 160px 0 100px 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
}

.hero-content {
    max-width: 680px;
}

.project-tag {
    font-size: 13px;
    color: var(--accent-color);
    margin-bottom: 16px;
    transition: color var(--transition-speed);
}

.project-title {
    font-size: 64px;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.1;
    margin-bottom: 16px;
    text-transform: uppercase;
}

body.era-chaotic .project-title {
    animation: textGlitch 0.2s infinite alternate;
}

.project-subtitle {
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: 32px;
    line-height: 1.4;
    font-weight: 300;
}

.hero-description {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 40px;
    border-left: 2px solid var(--border-color);
    padding-left: 16px;
}

.hero-cta {
    display: flex;
    gap: 16px;
}

/* 按钮通用样式（硬朗直角） */
.btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    border-radius: 0px; /* 严禁过度圆角 */
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-color);
    color: #000;
}

.btn-primary:hover {
    opacity: 0.9;
    box-shadow: 0 0 15px var(--accent-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--accent-color);
}

/* -------------------------------------------------------------------------- */
/* 通用区块排版 */
/* -------------------------------------------------------------------------- */
.section {
    padding: 100px 0;
    border-top: 1px solid var(--border-color);
    transition: border-color var(--transition-speed);
}

.section-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 48px;
}

.section-num {
    font-size: 14px;
    color: var(--accent-color);
    transition: color var(--transition-speed);
}

.section-header h2 {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

/* 2. 核心定位 */
.concept-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.concept-lead {
    font-size: 20px;
    line-height: 1.5;
    color: var(--text-primary);
    font-weight: 400;
}

.concept-body {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-muted);
}

/* 3. 核心系统卡片 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.sys-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 32px;
    position: relative;
    transition: all var(--transition-speed) ease;
}

.sys-card h3 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.sys-card p {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-muted);
}

.sys-card:hover {
    border-color: var(--accent-color);
}

/* 4. 玩家循环流动图 */
.loop-flow {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
}

.loop-step {
    background: rgba(255, 255, 255, 0.01);
    border: 1px dashed var(--border-color);
    padding: 24px;
    flex: 1;
    text-align: center;
}

.step-num {
    font-size: 12px;
    color: var(--accent-color);
    margin-bottom: 8px;
}

.loop-step h4 {
    font-size: 16px;
    margin-bottom: 8px;
}

.loop-step p {
    font-size: 13px;
    color: var(--text-muted);
}

.loop-arrow {
    color: var(--border-color);
    font-weight: bold;
}

.loop-summary {
    text-align: center;
    font-size: 14px;
    color: var(--accent-color);
    padding: 16px;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border-color);
}

/* 5. S1 Demo */
.demo-wrapper {
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(13,15,18,0.5) 100%);
    border: 1px solid var(--border-color);
    padding: 48px;
}

.demo-subtitle {
    color: var(--accent-color);
    font-size: 15px;
    margin-bottom: 16px;
}

.demo-desc {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 800px;
}

.demo-features-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    font-size: 13px;
    color: var(--text-primary);
}

/* 6. 路线图 */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 32px;
    position: relative;
    padding-left: 24px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--border-color);
}

.time-node {
    position: relative;
}

.time-node::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 6px;
    width: 9px;
    height: 9px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
}

.time-node.active::before {
    background: var(--accent-color);
    border-color: var(--accent-color);
    box-shadow: 0 0 8px var(--accent-color);
}

.node-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.time-node p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* -------------------------------------------------------------------------- */
/* 页脚 */
/* -------------------------------------------------------------------------- */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 32px 0;
    font-size: 11px;
    color: var(--text-muted);
}

.footer .container {
    display: flex;
    justify-content: space-between;
}

.footer-left {
    display: flex;
    gap: 16px;
}

/* -------------------------------------------------------------------------- */
/* 响应式适配 */
/* -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    .concept-grid, .card-grid, .demo-features-list {
        grid-template-columns: 1fr;
    }
    .loop-flow {
        flex-direction: column;
    }
    .loop-arrow {
        transform: rotate(90deg);
        margin: 4px 0;
    }
    .project-title {
        font-size: 44px;
    }
}

/* 特效：乱纪元下的标题微颤动 */
@keyframes textGlitch {
    0% { transform: skew(0.5deg); }
    100% { transform: skew(-0.5deg); }
}