/* --- 1. 变量与基础重置 --- */
:root {
    --bg-color: #ffffff;
    --text-main: #0d3f44;
    --text-sub: #5d888d;
    --brand-color: rgb(0, 153, 168);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
    --particle-color: rgba(0, 153, 168, 0.6);
    --particle-connect: rgba(0, 153, 168, 0.15);
    --card-glow: rgba(0, 153, 168, 0.1);
}

[data-theme="dark"] {
    --bg-color: #050505;
    --text-main: #ffffff;
    --text-sub: #a0b1c0;
    --brand-color: #00ffea;
    --glass-bg: rgba(20, 20, 20, 0.6);
    --glass-border: rgba(255, 255, 255, 0.15);
    --particle-color: #00ffea;
    --particle-connect: rgba(0, 255, 234, 0.15);
    --card-glow: rgba(0, 255, 234, 0.2);
}

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

/* 强制锁定全站宽度，根除任何可能导致手机端左右摇摆的溢出 */
html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: "Sarasa Gothic SC", "PingFang SC", -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background-color 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* --- 2. 视觉背景层 --- */
#particleCanvas { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; pointer-events: none; }

.scroll-container::before, .scroll-container::after {
    content: ''; position: absolute; width: clamp(300px, 50vw, 600px); height: clamp(300px, 50vw, 600px); border-radius: 50%;
    filter: blur(120px); opacity: 0.08; z-index: -1; animation: floatOrb 15s infinite alternate ease-in-out;
}
.scroll-container::before { top: -10%; left: -10%; background: radial-gradient(circle, var(--brand-color), transparent); }
.scroll-container::after { bottom: 10%; right: -5%; background: radial-gradient(circle, #0099a8, transparent); animation-delay: -5s; }

@keyframes floatOrb { 0% { transform: translate(0, 0) scale(1); } 100% { transform: translate(50px, 80px) scale(1.1); } }

/* --- 3. 导航岛 --- */
.nav-island {
    position: fixed; top: 30px; left: 50%; transform: translateX(-50%);
    width: 90%; max-width: 1200px; height: 70px;
    background: var(--glass-bg); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border); border-radius: 100px;
    display: flex; justify-content: space-between; align-items: center; padding: 0 30px; z-index: 100;
}
.nav-logo-img { height: 40px; width: auto; }
.nav-menu { display: flex; gap: 40px; }
.nav-link { 
    font-size: 18px; font-weight: 700; color: var(--text-main); 
    text-decoration: none; transition: 0.3s; position: relative;
}
.nav-link:hover, .nav-link.active { color: var(--brand-color); text-shadow: 0 0 10px var(--particle-connect); }

/* 昼夜切换小圆点 */
.theme-dot { width: 24px; height: 24px; border-radius: 50%; border: 2px solid var(--text-main); cursor: pointer; position: relative; overflow: hidden; flex-shrink: 0; }
.theme-dot::after { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: var(--text-main); transform: scale(0); transition: transform 0.3s; border-radius: 50%; }
[data-theme="dark"] .theme-dot::after { transform: scale(0.6); }

/* 移动端汉堡菜单按钮（电脑端隐藏） */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 26px;
    height: 18px;
    cursor: pointer;
    z-index: 101;
    margin-left: auto; /* 核心修复：把按钮往右边推 */
    margin-right: 25px; /* 核心修复：跟昼夜切换小圆点保持舒适的间距 */
}
.menu-toggle span {
    display: block; width: 100%; height: 2px;
    background-color: var(--text-main); transition: all 0.3s ease; border-radius: 2px;
}

/* --- 4. 核心组件 (卡片) --- */
.glass-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
    backdrop-filter: blur(20px); border: 1px solid rgba(255, 255, 255, 0.1);
    padding: clamp(20px, 5vw, 40px); border-radius: 24px; transition: all 0.4s ease; cursor: pointer;
    word-break: break-word; /* 防止长文本撑破卡片 */
}
.glass-card:hover { transform: translateY(-10px); border-color: var(--brand-color); box-shadow: 0 20px 50px var(--card-glow); }

/* --- 5. 动画与布局 --- */
.big-text { font-size: clamp(40px, 7vw, 100px); font-weight: 900; line-height: 1.2; opacity: 0; transform: translateY(50px); transition: 1s; }
.section.active .big-text { opacity: 1; transform: translateY(0); }

.icp-link:hover { color: var(--brand-color) !important; border-bottom: 1px solid var(--brand-color); }

/* --- 6. 移动端菜单与导航栏适配 --- */
@media (max-width: 900px) { /* 扩大匹配范围，覆盖大部分手机及竖屏平板 */
    .nav-island { width: 92%; padding: 0 20px; top: 15px; height: 60px; }
    .nav-logo-img { height: 30px; }
    
    /* 核心修复：强制显示汉堡按钮 */
    .menu-toggle { display: flex !important; }
    
    .nav-menu {
        position: absolute; top: 75px; left: 0; width: 100%;
        background: var(--glass-bg); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border); border-radius: 20px;
        flex-direction: column; align-items: center; padding: 25px 0; gap: 20px;
        opacity: 0; visibility: hidden; transform: translateY(-20px);
        transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    }
    
    .nav-menu.active { opacity: 1; visibility: visible; transform: translateY(0); }
    
    .menu-toggle.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .menu-toggle.active span:nth-child(2) { opacity: 0; }
    .menu-toggle.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
}