:root {
    /* 核心颜色体系 - Nova Interactive 2.0 旗舰版 */
    --bg-dark: #020617;
    --bg-card: #0f172a;
    --primary: #38bdf8;
    --primary-glow: rgba(56, 189, 248, 0.4);
    --secondary: #818cf8;
    --accent: #c084fc;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --glass: rgba(15, 23, 42, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
    --grad-main: linear-gradient(135deg, var(--primary), var(--secondary));

    --font-main: 'Outfit', 'Inter', -apple-system, sans-serif;
    --transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

html {
    scroll-behavior: smooth;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    list-style: none;
    text-decoration: none;
}

body {
    font-family: var(--font-main);
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 宇宙底噪效果 */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background:
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.08), transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(192, 132, 252, 0.08), transparent 40%);
    opacity: 0.5;
    pointer-events: none;
}

#starfield-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    pointer-events: none;
    background: #020617;
}

/* 品牌加载仪式感 Preloader */
.preloader {
    position: fixed;
    inset: 0;
    background: #020617;
    z-index: 999999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.8s;
}

.preloader.fade-out {
    opacity: 0;
    visibility: hidden;
}

.preloader-logo {
    font-size: 4rem;
    font-weight: 900;
    letter-spacing: 20px;
    color: white;
    animation: loaderPulse 2.5s ease-in-out infinite;
    text-transform: uppercase;
    font-family: var(--font-main);
}

@keyframes loaderPulse {

    0%,
    100% {
        opacity: 0.2;
        transform: scale(0.95);
        letter-spacing: 20px;
        filter: blur(2px);
    }

    50% {
        opacity: 1;
        transform: scale(1.05);
        letter-spacing: 30px;
        filter: blur(0px);
    }
}

/* 金属流光标题 */
.shimmer {
    background: linear-gradient(120deg,
            rgba(255, 255, 255, 0) 30%,
            rgba(255, 255, 255, 0.8) 50%,
            rgba(255, 255, 255, 0) 70%);
    background-size: 200% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    animation: metallicShimmer 3s infinite linear;
}

@keyframes metallicShimmer {
    0% {
        background-position: -150% 0;
    }

    100% {
        background-position: 150% 0;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 极致导航 */
.header {
    position: fixed;
    top: 20px;
    /* 产生漂浮感 */
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 1200px;
    z-index: 10000;
    padding: 1.2rem 2.5rem;
    transition: var(--transition);
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(40px) saturate(180%);
    border-radius: 99px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.header.scrolled {
    background: rgba(15, 23, 42, 0.9);
    padding: 0.8rem 2.5rem;
    top: 10px;
}

main {
    padding-top: 180px;
    /* 增加顶距，预留出漂浮 Header 的空间 */
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.02em;
    position: relative;
    overflow: hidden;
    background: linear-gradient(90deg, #fff, #818cf8, #fff);
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: shine 5s linear infinite;
}

@keyframes shine {
    0% {
        background-position: -100% center;
    }

    50% {
        background-position: 200% center;
    }

    100% {
        background-position: -100% center;
    }
}

.logo:hover {
    text-shadow: 0 0 25px var(--primary-glow), 0 0 50px rgba(56, 189, 248, 0.2);
    transform: scale(1.03);
    letter-spacing: 0.02em;
}

.nav-links {
    display: flex;
    gap: 3rem;
    align-items: center;
}

.nav-links li {
    position: relative;
    padding: 0;
}

/* 导航链接基础样式 */
.nav-links>li>a {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: var(--transition);
    padding: 10px 0;
    display: block;
}

.nav-links>li>a:hover {
    color: var(--primary);
}

.dropdown-toggle {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
}

.dropdown-toggle::after {
    content: '▾';
    font-size: 0.8rem;
    opacity: 0.5;
}

/* 下拉菜单容器 - 初始彻底隐藏 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: #0f172a;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(25px);
    border-radius: 12px;
    padding: 8px;
    min-width: 180px;
    display: none;
    /* 使用 display 提高稳定性 */
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    z-index: 99999;
}

li:hover .dropdown-menu {
    display: block;
    /* 悬停显示 */
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu a {
    display: block !important;
    padding: 12px 20px !important;
    color: var(--text-muted) !important;
    font-size: 0.85rem !important;
    font-weight: 400 !important;
    border-radius: 8px;
    text-transform: none !important;
    white-space: nowrap;
    text-align: left;
    transition: 0.3s;
}

.dropdown-menu a:hover {
    background: rgba(56, 189, 248, 0.1) !important;
    color: var(--primary) !important;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: radial-gradient(circle at center, rgba(56, 189, 248, 0.05) 0%, transparent 70%);
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
    font-weight: 800;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 3rem;
    line-height: 1.8;
}

/* Products / Showcase Section */
.products {
    padding: 10rem 0;
}

.section-intro {
    text-align: center;
    margin-bottom: 8rem;
}

.section-intro h2 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.product-grid {
    width: 100%;
}

/* 信任层网格样式 */
.trust-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 4rem;
}

.trust-card {
    padding: 3rem;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    transition: var(--transition);
}

.trust-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary);
    transform: translateY(-5px);
}

/* 极致自定义光标 */
.custom-cursor {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--primary-glow), transparent 70%);
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transform: translate(-50%, -50%);
    mix-blend-mode: screen;
    opacity: 0.2;
    transition: width 0.3s, height 0.3s;
}

/* 通用卡片样式 */
.product-card,
.feature-card-large {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px) saturate(150%);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.product-card:hover,
.feature-card-large:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(15, 23, 42, 0.8);
    transform: translateY(-5px);
}

/* 磁力流光特效 */
.product-card::after,
.feature-card-large::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(600px circle at var(--x, 0px) var(--y, 0px), rgba(56, 189, 248, 0.15), transparent 40%);
    opacity: 0;
    transition: opacity 0.5s;
    pointer-events: none;
}

.product-card:hover::after,
.feature-card-large:hover::after {
    opacity: 1;
}

/* 按钮样式 */
.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--text-main);
    color: var(--bg-dark);
    border-radius: 99px;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.phone-display-container:hover {
    transform: translateY(-10px) scale(1.02);
    filter: brightness(1.1);
    box-shadow: 0 70px 140px -20px rgba(0, 0, 0, 0.6), 0 0 80px var(--primary-glow);
}

.cta-button:hover {
    transform: scale(1.05) translateY(-2px);
    background: var(--primary);
    color: white;
    box-shadow: 0 15px 40px var(--primary-glow);
}

/* 旗舰商店徽章 */
.store-badges {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 3rem;
    opacity: 0.8;
}

.store-badge {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    cursor: not-allowed;
    transition: var(--transition);
    text-align: left;
}

.store-badge:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.store-badge .icon-svg {
    height: 22px;
    width: 22px;
    flex-shrink: 0;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
}

.store-badge .apple-icon {
    /* 采用自然宽高比 */
}

.store-badge .play-icon {
    width: 22px;
}

.store-badge .text-box {
    display: flex;
    flex-direction: column;
}

.store-badge .top-text {
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.store-badge .bottom-text {
    font-size: 0.9rem;
    font-weight: 700;
    color: white;
}

/* 滚动提示 */
.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    opacity: 0.5;
    animation: bounce 2s infinite;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* 语言下拉菜单极致设计 */
.lang-dropdown {
    position: relative;
    display: inline-block;
}

.lang-switch {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(10px);
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.lang-switch::after {
    content: '▾';
    font-size: 0.7rem;
    opacity: 0.5;
    transition: transform 0.3s ease;
}

.lang-dropdown:hover .lang-switch {
    border-color: var(--primary);
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.08);
}

.lang-dropdown:hover .lang-switch::after {
    transform: rotate(180deg);
}

.lang-menu {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(25px);
    border-radius: 16px;
    padding: 10px;
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1000;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.lang-dropdown:hover .lang-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.lang-option:hover {
    background: rgba(56, 189, 248, 0.1);
    color: var(--primary);
}

.lang-option.active {
    color: var(--primary);
    background: rgba(56, 189, 248, 0.05);
}

.lang-option.active::after {
    content: '✓';
    font-size: 0.8rem;
}

/* Footer */
.footer {
    padding: 3rem 0 2rem;
    border-top: 1px solid var(--glass-border);
    background: rgba(2, 6, 23, 0.5);
    text-align: center;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    text-align: left;
}

.footer-grid ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-grid li {
    margin-bottom: 0.8rem;
    list-style-type: none;
    /* 彻底移除圆点 */
}

.footer-grid h4 {
    color: white;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.8rem;
}

.footer-grid p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
    max-width: 300px;
}

.footer-grid a {
    color: var(--text-muted);
    transition: var(--transition);
}

.footer-grid a:hover {
    color: var(--primary);
}

.footer-rights {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 1px;
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex !important;
        flex-direction: column;
        gap: 6px;
        cursor: pointer;
        z-index: 10001;
    }

    .menu-toggle span {
        width: 25px;
        height: 2px;
        background: var(--text-main);
        transition: 0.3s;
    }

    .nav-links {
        display: flex !important;
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(2, 6, 23, 0.98);
        backdrop-filter: blur(30px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        padding: 2rem;
    }

    .nav-links.active {
        right: 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);
    }

    .hero h1 {
        font-size: 3.5rem;
    }

    .advantage-grid {
        grid-template-columns: 1fr !important;
    }

    .section-intro h2 {
        font-size: 2.5rem;
    }

    #starfield-canvas {
        display: none;
        /* 移动端关闭 Canvas 以节省电量 */
    }
}