/* ============================================================
   QuickQ 官网首页 —— index.css
   结构：01 基础重置 / 02 头部 / 03 底部 / 04 悬浮按钮
        05 Hero / 06 数据条 / 07 下载参数 / 08 节点地图
        09 订阅 / 10 关于 / 11 六大优势 / 12 连接性能
        13 智能链路 / 14 用户评价 / 15 使用指南 / 16 FAQ
        17 响应式
   ============================================================ */

/* ============================================================
   01  基础重置与设计变量
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4f7cff;
    --primary-dark: #3a5fd9;
    --primary-glow: rgba(79, 124, 255, .45);
    --accent: #00d4ff;
    --bg-base: #060b18;
    --bg-dark: #0a1122;
    --bg-card: #0f1a30;
    --bg-glass: rgba(15, 26, 48, .55);
    --text: #eaf0ff;
    --text-muted: rgba(255, 255, 255, .65);
    --text-dim: rgba(255, 255, 255, .35);
    --border: rgba(255, 255, 255, .08);
    --border-glow: rgba(79, 124, 255, .25);
    --shadow-card: 0 20px 60px rgba(0, 0, 0, .6);
    --shadow-glow: 0 0 80px rgba(79, 124, 255, .2);
    --radius: 1.25rem;
    --radius-sm: .75rem;
    --radius-full: 9999px;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    background: var(--bg-base);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { background: none; border: none; cursor: pointer; color: inherit; }
ul, ol, li { list-style: none; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 10px; }

.container {
    width: 96%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 通用按钮 */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .6rem;
    padding: .7rem 2rem;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 8px 32px rgba(79, 124, 255, .35);
    color: #fff;
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: .3px;
    position: relative;
    overflow: hidden;
    transition: transform .25s ease, box-shadow .3s ease;
}

.btn-primary::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(135deg, rgba(255, 255, 255, .15), transparent 60%);
    pointer-events: none;
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 14px 44px rgba(79, 124, 255, .5);
}

.btn-primary:active { transform: scale(.97); }

.btn-glow-wrap { position: relative; display: inline-block; }

.btn-glow-wrap::before {
    content: "";
    position: absolute;
    inset: -4px;
    z-index: -1;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--accent), var(--primary));
    background-size: 200% 200%;
    filter: blur(18px);
    opacity: .3;
    animation: glowPulse 3s ease-in-out infinite alternate;
}

@keyframes glowPulse {
    0%   { opacity: .2; transform: scale(.95); }
    100% { opacity: .6; transform: scale(1.05); }
}

/* 通用区块标题 */
.section-title {
    font-size: clamp(1.8rem, 4.5vw, 3.6rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -.02em;
    text-align: center;
    color: #fff;
}

.section-title .highlight {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-sub {
    max-width: 720px;
    margin: .5rem auto 0;
    color: var(--text-muted);
    font-size: clamp(.95rem, 1.2vw, 1.2rem);
    text-align: center;
}


/* ============================================================
   02  头部
   ============================================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: .4rem 0;
    background: #03050b;
    backdrop-filter: blur(18px) saturate(1.2);
    -webkit-backdrop-filter: blur(18px) saturate(1.2);
    transition: background .3s;
}

.header.scrolled {
    background: rgba(6, 11, 24, .85);
    backdrop-filter: blur(24px) saturate(1.4);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 96%;
    margin: 0 auto;
    padding: 1rem;
}

.logo img { height: 2rem; width: auto; transition: opacity .2s; }
.logo:hover img { opacity: .85; }

.nav-desktop {
    display: none;
    align-items: center;
    gap: .5rem;
    flex: 1;
    margin-left: 2.5rem;
}

@media (min-width: 820px) {
    .nav-desktop { display: flex; }
}

.nav-desktop > a {
    padding: .4rem .9rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: .9rem;
    font-weight: 500;
    letter-spacing: .2px;
    white-space: nowrap;
    transition: color .2s, background .2s;
}

.nav-desktop > a:hover {
    color: #fff;
    background: rgba(255, 255, 255, .06);
}

.nav-cta { display: none; align-items: center; gap: .8rem; }

@media (min-width: 820px) {
    .nav-cta { display: flex; }
}

.nav-cta .btn-login {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .4rem 1.4rem;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 4px 16px rgba(79, 124, 255, .25);
    color: #fff;
    font-size: .85rem;
    font-weight: 600;
    transition: transform .2s, box-shadow .2s;
}

.nav-cta .btn-login:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 28px rgba(79, 124, 255, .4);
}

.hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: .35rem .7rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, .04);
    color: #fff;
    font-size: 1.1rem;
    transition: background .2s;
}

.hamburger:hover { background: rgba(255, 255, 255, .08); }

@media (min-width: 820px) { .hamburger { display: none; } }

.nav-mobile {
    display: none;
    width: 100%;
    margin: 0 auto;
    padding: .5rem .5rem 1rem;
    border-top: 1px solid var(--border);
    background: rgba(6, 11, 24, .92);
    backdrop-filter: blur(12px);
}

.nav-mobile.open {
    display: block;
    animation: slideDown .25s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.nav-mobile a {
    display: block;
    padding: .5rem .8rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: .95rem;
    transition: background .15s, color .15s;
}

.nav-mobile a:hover { background: rgba(255, 255, 255, .05); color: #fff; }

.nav-mobile .btn-login-mobile {
    margin-top: .5rem;
    padding: .6rem;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff !important;
    font-weight: 600;
    text-align: center;
}


/* ============================================================
   03  底部
   ============================================================ */
.footer {
    padding: 3.5rem 1rem 1.8rem;
    background: var(--bg-base);
    border-top: 1px solid var(--border);
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2.5rem 4rem;
    margin: 0 auto;
}

.footer-brand { flex: 0 0 auto; min-width: 200px; max-width: 320px; }

.footer-brand .logo-footer img {
    height: 2.6rem;
    width: auto;
    opacity: .9;
    transition: opacity .2s;
}

.footer-brand .logo-footer img:hover { opacity: 1; }

.footer-brand .brand-desc {
    margin-top: .6rem;
    color: var(--text-dim);
    font-size: .82rem;
    line-height: 1.7;
}

.footer-brand .brand-desc strong { color: #fff; }

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem 3rem;
    flex: 1;
    max-width: 560px;
}

.footer-links ul li:first-child {
    display: inline-block;
    position: relative;
    margin-bottom: .6rem;
    color: #fff;
    font-size: .9rem;
    font-weight: 700;
    letter-spacing: .4px;
}

.footer-links ul li:first-child::after {
    content: "";
    display: block;
    width: 24px;
    height: 2px;
    margin-top: .3rem;
    border-radius: 2px;
    background: var(--primary);
    opacity: .5;
}

.footer-links ul li { margin-bottom: .25rem; }

.footer-links ul a {
    display: inline-block;
    padding: .1rem 0;
    color: var(--text-dim);
    font-size: .82rem;
    transition: color .2s, padding-left .2s;
}

.footer-links ul a:hover { color: #fff; padding-left: .3rem; }

.footer-bottom {
    max-width: 1200px;
    margin: 2.8rem auto 0;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: .7rem;
    letter-spacing: .5px;
    text-align: center;
}

.footer-bottom .heart {
    display: inline-block;
    color: var(--accent);
    animation: heartBeat 2s ease-in-out infinite;
}

@keyframes heartBeat {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.15); }
}


/* ============================================================
   04  右下悬浮按钮
   ============================================================ */
.backfab {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 60;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.backfab button,
.backfab a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: rgba(15, 26, 48, .7);
    box-shadow: 0 8px 24px rgba(0, 0, 0, .3);
    color: var(--text-muted);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition: transform .2s, background .2s, color .2s, box-shadow .2s;
}

.backfab button:hover,
.backfab a:hover {
    transform: translateY(-2px) scale(1.04);
    border-color: rgba(79, 124, 255, .2);
    background: rgba(79, 124, 255, .15);
    box-shadow: 0 12px 32px rgba(79, 124, 255, .15);
    color: #fff;
}


/* ============================================================
   05  Hero 首屏
   ============================================================ */
.main-index { overflow: hidden; }

.main-index .hero {
    position: relative;
    display: flex;
    align-items: center;
    min-height: 88vh;
    overflow: hidden;
}

.main-index .hero .hero_background {
    position: absolute;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.main-index .hero::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        radial-gradient(circle at 20% 30%, rgba(79, 124, 255, .18), transparent 55%),
        radial-gradient(circle at 78% 65%, rgba(0, 212, 255, .12), transparent 55%),
        linear-gradient(135deg, rgba(6, 11, 24, .55), rgba(6, 11, 24, .2) 50%, rgba(6, 11, 24, .6));
}

.main-index .hero-content {
    position: relative;
    z-index: 2;
    margin-top: -3rem;
    padding: 3rem 1rem;
}

.main-index .hero-content .badge {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    margin-bottom: 1.2rem;
    padding: .2rem 1rem .2rem .6rem;
    border-radius: var(--radius-full);
    border: 1px solid rgba(79, 124, 255, .15);
    background: rgba(79, 124, 255, .12);
    color: var(--accent);
    font-size: .75rem;
    font-weight: 500;
    letter-spacing: .5px;
}

.main-index .hero-content .badge i { font-size: .5rem; }

.main-index .hero-content h1 {
    color: #fff;
    font-size: clamp(1.9rem, 5vw, 3rem);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -.03em;
    background: linear-gradient(135deg, #fff 0%, #cfe0ff 45%, #7ff0dc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-index .hero-content h1 .highlight {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-index .hero-content .sub-headline {
    max-width: 680px;
    margin-top: 1.2rem;
    color: var(--text-muted);
    font-size: clamp(1rem, 1.2vw, 1.25rem);
    line-height: 1.8;
}

.main-index .hero-content .sub-headline strong { color: #fff; font-weight: 600; }

.main-index .hero-content .sub-headline-list {
    display: grid;
    gap: .55rem;
    margin-top: 1rem;
    max-width: 760px;
}

.main-index .hero-content .sub-headline-list li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-muted);
    font-size: .92rem;
    line-height: 1.75;
}

.main-index .hero-content .sub-headline-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .62em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    box-shadow: 0 0 12px rgba(79, 124, 255, .6);
}

.main-index .hero-content .sub-headline-list strong { color: #fff; font-weight: 600; }

.main-index .hero-content .cta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

.main-index .hero-content .cta .sub-cta {
    display: flex;
    align-items: center;
    gap: .4rem;
    padding: .65rem 1.2rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, .03);
    color: var(--text-muted);
    font-size: .85rem;
    transition: color .2s, border-color .2s, background .2s;
}

.main-index .hero-content .cta .sub-cta:hover {
    color: #fff;
    border-color: rgba(79, 124, 255, .35);
    background: rgba(79, 124, 255, .08);
}

.main-index .hero-content .cta .sub-cta i { color: var(--accent); }

.main-index .platform-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 1.5rem;
    margin-top: 1.8rem;
}

.main-index .platform-badges span {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .3rem .8rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
    background: hsla(0, 0%, 100%, .04);
    color: var(--text-muted);
    font-size: .85rem;
}

.main-index .platform-badges i { color: var(--accent); font-size: 1rem; }

@keyframes fadeUp {
    0% { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.main-index .hero-content > * { animation: fadeUp .8s ease forwards; }
.main-index .hero-content .cta { animation-delay: .2s; }
.main-index .hero-content .platform-badges { animation-delay: .4s; }


/* ============================================================
   06  数据条
   ============================================================ */
.main-index .stats-bar {
    position: relative;
    overflow: hidden;
    padding: .8rem 0;
    background: var(--bg-dark);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.main-index .stats-bar::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(ellipse at 30% 50%, rgba(79, 124, 255, .08), transparent 70%);
}

.main-index .stats-bar-inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .6rem;
    padding: 0 1rem;
}

@media (min-width: 768px) {
    .main-index .stats-bar-inner {
        flex-direction: row;
        justify-content: space-between;
    }
}

.main-index .stats-people {
    display: flex;
    align-items: center;
    gap: .6rem;
    padding: .2rem .8rem .2rem .2rem;
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    background: hsla(0, 0%, 100%, .03);
    cursor: pointer;
    transition: background .2s;
}

.main-index .stats-people:hover {
    background: hsla(0, 0%, 100%, .06);
    border-color: var(--border);
}

.main-index .stats-people .avatars { display: flex; }

.main-index .stats-people .avatars img {
    width: clamp(38px, 2.6vw, 50px);
    height: clamp(38px, 2.6vw, 50px);
    margin-left: -.5rem;
    border: 2px solid var(--bg-dark);
    border-radius: 50%;
    object-fit: cover;
    transition: transform .2s;
}

.main-index .stats-people .avatars img:first-child { margin-left: 0; }
.main-index .stats-people .avatars img:hover { transform: scale(1.08); z-index: 10; }

.main-index .stats-people .count {
    color: var(--text-muted);
    font-size: clamp(.8rem, .9vw, 1rem);
    font-weight: 500;
}

.main-index .stats-people .count span { color: #fff; font-weight: 700; }

.main-index .stats-metrics {
    display: flex;
    gap: clamp(1.2rem, 5vw, 3.5rem);
    justify-content: space-around;
    width: 100%;
    color: var(--text-muted);
}

@media (min-width: 768px) {
    .main-index .stats-metrics {
        justify-content: flex-end;
        width: auto;
    }
}

.main-index .stats-metrics li { text-align: center; }

.main-index .stats-metrics .number {
    display: inline-block;
    min-width: 1.2em;
    color: #fff;
    font-size: clamp(1.4rem, 2vw, 2.2rem);
    font-weight: 700;
}

.main-index .stats-metrics .label {
    display: block;
    margin-top: .05rem;
    color: var(--text-dim);
    font-size: clamp(.65rem, .75vw, .85rem);
}


/* ============================================================
   07  下载参数
   ============================================================ */
.main-index .download-details {
    padding: 2rem 1rem 3rem;
    background: var(--bg-card);
}

.main-index .download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-top: 1.8rem;
    text-align: center;
}

.main-index .download-item {
    position: relative;
    padding: 1.2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: rgba(15, 26, 48, .6);
    overflow: hidden;
    transition: transform .3s, border-color .3s, box-shadow .3s;
}

.main-index .download-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent), transparent);
    opacity: .8;
}

.main-index .download-item:hover {
    border-color: rgba(79, 124, 255, .3);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, .45);
}

.main-index .download-item .os { color: #fff; font-size: 1.1rem; font-weight: 700; }
.main-index .download-item .version { color: var(--text-muted); font-size: .85rem; }
.main-index .download-item .sys { color: var(--text-dim); font-size: .75rem; }


/* ============================================================
   08  节点地图
   ============================================================ */
.main-index .map-section {
    position: relative;
    padding: 3rem 0 4rem;
    background: var(--bg-card);
    overflow: hidden;
}

.main-index .map-section::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(ellipse at 60% 40%, rgba(79, 124, 255, .06), transparent 70%);
}

.main-index .map-container {
    position: relative;
    width: 100%;
    max-width: 90%;
    aspect-ratio: 24 / 10;
    margin: 2rem auto 0;
    border-radius: var(--radius);
    overflow: hidden;
}

.main-index .map-container img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: .9;
}

.main-index .map-nodes { position: relative; width: 100%; height: 100%; }

.main-index .map-node {
    position: absolute;
    z-index: 10;
    cursor: pointer;
    transform: translate(-50%, -50%);
}

.main-index .map-node .dot {
    position: relative;
    z-index: 2;
    width: .5rem;
    height: .5rem;
    border-radius: 50%;
    background: linear-gradient(135deg, #93c5fd, var(--primary));
    box-shadow: 0 0 0 0 rgba(79, 124, 255, .5);
    transition: transform .3s, box-shadow .3s;
}

.main-index .map-node:hover .dot {
    transform: scale(1.7);
    box-shadow: 0 0 0 8px rgba(79, 124, 255, .15);
}

.main-index .map-node .ripple {
    position: absolute;
    inset: -2.5rem;
    pointer-events: none;
}

.main-index .map-node .ripple span {
    position: absolute;
    left: 50%;
    top: 50%;
    width: .5rem;
    height: .5rem;
    margin: -.25rem;
    border-radius: 50%;
    border: 1px solid rgba(79, 124, 255, .4);
    opacity: 0;
    transform: scale(1);
}

.main-index .map-node:hover .ripple span { animation: ripple-wave 2s infinite; }
.main-index .map-node:hover .ripple span:nth-child(2) { animation-delay: .4s; }
.main-index .map-node:hover .ripple span:nth-child(3) { animation-delay: .8s; }

@keyframes ripple-wave {
    0%  { opacity: .7; transform: scale(1); }
    to  { opacity: 0; transform: scale(20); }
}

.main-index .map-node .tooltip {
    position: absolute;
    left: 50%;
    bottom: calc(100% + 8px);
    z-index: 20;
    padding: .3rem .8rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: rgba(6, 11, 24, .92);
    box-shadow: 0 8px 24px rgba(0, 0, 0, .5);
    color: #fff;
    font-size: .7rem;
    white-space: nowrap;
    backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(4px);
    transition: opacity .25s, transform .25s, visibility .25s;
}

.main-index .map-node:hover .tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.main-index .map-node .tooltip > div {
    margin-top: .1rem;
    color: var(--text-dim);
    font-size: .66rem;
}

.main-index .map-node .tooltip .status { color: #4ade80; font-weight: 500; }


/* ============================================================
   09  订阅
   ============================================================ */
.main-index .subscription {
    position: relative;
    display: flex;
    align-items: center;
    min-height: 60vh;
    overflow: hidden;
    background: var(--bg-dark);
}

.main-index .subscription::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(79, 124, 255, .06), transparent 70%),
        radial-gradient(ellipse at 85% 80%, rgba(0, 212, 255, .12), transparent 55%);
}

.main-index .subs-inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    width: 100%;
    min-height: 60vh;
    padding: 4rem 1rem;
}

.main-index .subs-left {
    flex: 0 1 auto;
    width: 100%;
    max-width: 640px;
    text-align: center;
}

.main-index .subs-left h2 {
    color: #fff;
    font-size: clamp(2rem, 4.5vw, 3rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -.02em;
}

.main-index .subs-left h2 .highlight {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-index .subs-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .6rem 1.8rem;
    margin: 1.5rem 0;
}

.main-index .subs-features li {
    display: flex;
    align-items: center;
    gap: .5rem;
    color: var(--text-muted);
    font-size: .95rem;
}

.main-index .subs-features li::before {
    content: "\f00c";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    color: var(--accent);
    font-size: .7rem;
}

.main-index .subs-timer {
    display: flex;
    gap: .8rem;
    justify-content: center;
    margin: 1.2rem 0;
}

.main-index .subs-timer > div {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.main-index .subs-timer .time-box {
    min-width: 2.8rem;
    padding: .2rem .7rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(79, 124, 255, .3);
    background: rgba(0, 0, 0, .5);
    box-shadow: inset 0 0 20px rgba(79, 124, 255, .08);
    color: #fff;
    font-size: 1.4rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    text-align: center;
    backdrop-filter: blur(4px);
}

.main-index .subs-timer .time-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: .2rem;
    color: var(--text-dim);
    font-size: .65rem;
    letter-spacing: 1px;
}


/* ============================================================
   10  关于
   ============================================================ */
.main-index .about-section {
    padding: 3rem 1rem 4rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}

.main-index .about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 2.5rem;
}

@media (min-width: 768px) {
    .main-index .about-grid { grid-template-columns: 1fr 1fr; }
}

.main-index .about-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.main-index .about-text h3 {
    margin-bottom: .8rem;
    color: #fff;
    font-size: 1.6rem;
    font-weight: 700;
}

.main-index .about-text p {
    margin-bottom: .8rem;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.8;
}

.main-index .about-text p strong { color: #fff; }
.main-index .about-text .highlight { color: var(--accent); }

.main-index .about-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: .5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.main-index .about-meta span {
    display: flex;
    align-items: center;
    gap: .4rem;
    color: var(--text-dim);
    font-size: .85rem;
}

.main-index .about-meta i { color: var(--accent); }


/* ============================================================
   11  六大核心优势
   ============================================================ */
.main-index .advantages-section {
    padding: 3rem 1rem 4rem;
    background: var(--bg-dark);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.main-index .advantages-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.8rem;
    margin-top: 2.5rem;
}

@media (min-width: 640px)  { .main-index .advantages-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .main-index .advantages-grid { grid-template-columns: repeat(3, 1fr); } }

.main-index .advantage-card {
    position: relative;
    padding: 1.8rem 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: rgba(15, 26, 48, .5);
    backdrop-filter: blur(4px);
    overflow: hidden;
    transition: transform .3s, border-color .3s, box-shadow .3s;
}

.main-index .advantage-card::after {
    content: "";
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200px;
    height: 200px;
    pointer-events: none;
    background: radial-gradient(circle, rgba(79, 124, 255, .14), transparent 70%);
    opacity: 0;
    transition: opacity .35s ease;
}

.main-index .advantage-card:hover {
    border-color: rgba(79, 124, 255, .3);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, .3), 0 0 0 1px rgba(79, 124, 255, .1);
}

.main-index .advantage-card:hover::after { opacity: 1; }

.main-index .advantage-card .icon {
    margin-bottom: .6rem;
    color: var(--accent);
    font-size: 2rem;
}

.main-index .advantage-card h3 {
    margin-bottom: .4rem;
    color: #fff;
    font-size: 1.2rem;
    font-weight: 700;
}

.main-index .advantage-card p {
    color: var(--text-muted);
    font-size: .95rem;
    line-height: 1.7;
}


/* ============================================================
   12  连接性能
   ============================================================ */
.main-index .game-section {
    position: relative;
    padding: 3rem 1rem 4rem;
    background: var(--bg-card);
    overflow: hidden;
}

.main-index .game-section::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(ellipse at 30% 80%, rgba(79, 124, 255, .04), transparent 60%);
}

.main-index .game-cards-wrap {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 100%;
    aspect-ratio: 1200 / 420;
    margin: 2rem auto 0;
    overflow: hidden;
}

.main-index .game-card {
    position: absolute;
    width: 56%;
    max-width: 56%;
    aspect-ratio: 881 / 420;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: 0 16px 48px rgba(0, 0, 0, .5);
    overflow: hidden;
    transition:
        transform .6s cubic-bezier(.34, 1.56, .64, 1),
        opacity .5s ease,
        z-index .1s;
}

.main-index .game-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.main-index .game-card p {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 1.2rem 1.5rem .8rem;
    background: linear-gradient(0deg, rgba(6, 11, 24, .8) 0%, transparent);
    color: #fff;
    font-size: clamp(.6rem, .9vw, .95rem);
    font-weight: 400;
    letter-spacing: .2px;
    text-align: center;
    text-shadow: 0 4px 12px rgba(0, 0, 0, .4);
    opacity: .9;
}

.main-index .game-card[data-pos="center"] {
    z-index: 30;
    opacity: 1;
    transform: translateX(0) scale(1);
}

.main-index .game-card[data-pos="left"] {
    z-index: 10;
    opacity: .55;
    transform: translateX(-64%) scale(.8);
}

.main-index .game-card[data-pos="right"] {
    z-index: 10;
    opacity: .55;
    transform: translateX(64%) scale(.8);
}

.main-index .game-title,
.main-index .game-sub {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity .6s ease, transform .6s ease;
}

.main-index .game-sub {
    transform: translateX(-60px);
    transition-delay: .08s;
}

.main-index .game-title.visible,
.main-index .game-sub.visible {
    opacity: 1;
    transform: translateX(0);
}

@media (max-width: 768px) {
    .main-index .game-card[data-pos="center"] { max-width: 82%; }
    .main-index .game-card[data-pos="left"],
    .main-index .game-card[data-pos="right"] { max-width: 68%; }

    .main-index .game-card p {
        font-size: .6rem;
        padding: .8rem .8rem .4rem;
    }
}


/* ============================================================
   13  智能加速链路
   ============================================================ */
.main-index .ecommerce-section {
    padding: 3rem 1rem 4rem;
    background: var(--bg-dark);
}

.main-index .ecommerce-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.8rem;
    margin-top: 2.5rem;
}

@media (min-width: 768px) {
    .main-index .ecommerce-grid { grid-template-columns: 1fr 1fr; }
}

.main-index .ecommerce-grid .glass {
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-glass);
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(18px);
    overflow: hidden;
    transition: transform .3s, box-shadow .3s;
}

.main-index .ecommerce-grid .glass:hover {
    transform: translateY(-4px);
    box-shadow: 0 24px 64px rgba(0, 0, 0, .6);
}

.main-index .ecommerce-grid .glass img {
    display: block;
    width: 100%;
    height: auto;
}


/* ============================================================
   14  用户评价
   ============================================================ */
.main-index .reviews-section {
    padding: 3rem 1rem 4rem;
    background: var(--bg-card);
}

.main-index .reviews-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 2.5rem;
}

@media (min-width: 640px)  { .main-index .reviews-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .main-index .reviews-grid { grid-template-columns: repeat(3, 1fr); } }

.main-index .review-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 210px;
    padding: 1.5rem 1.2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: rgba(15, 26, 48, .6);
    box-shadow: 0 12px 32px rgba(0, 0, 0, .3);
    color: var(--text-muted);
    font-size: .85rem;
    backdrop-filter: blur(6px);
    transition: transform .3s, border-color .3s, box-shadow .3s;
}

.main-index .review-card:hover {
    border-color: rgba(79, 124, 255, .25);
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, .5);
}

.main-index .review-card .stars {
    color: #ffc857;
    font-size: .85rem;
    letter-spacing: 2px;
}

.main-index .review-card > p {
    flex: 1;
    line-height: 1.7;
}

.main-index .review-card .user {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .6rem;
    margin-top: .8rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.main-index .review-card .user img {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    border: 2px solid var(--border);
    border-radius: 50%;
    object-fit: cover;
}

.main-index .review-card .user .name {
    color: #fff;
    font-size: .85rem;
    font-weight: 600;
}

.main-index .review-card .user .role {
    color: var(--text-dim);
    font-size: .7rem;
}

.main-index .review-card .tag {
    margin-left: auto;
    padding: .1rem .6rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(79, 124, 255, .1);
    background: rgba(79, 124, 255, .08);
    color: var(--text-muted);
    font-size: .6rem;
    font-weight: 500;
    letter-spacing: .3px;
    white-space: nowrap;
}

@media (max-width: 480px) {
    .main-index .review-card {
        min-height: 180px;
        padding: 1rem .8rem;
        font-size: .75rem;
    }
    .main-index .review-card .user img { width: 30px; height: 30px; }
    .main-index .review-card .tag { font-size: .5rem; padding: .05rem .4rem; }
}


/* ============================================================
   15  使用指南（图标版）
   ============================================================ */
.main-index .guides-section {
    padding: 3rem 1rem 4rem;
    background: var(--bg-dark);
}

.main-index .guides-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 2.5rem;
}

@media (min-width: 640px)  { .main-index .guides-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .main-index .guides-grid { grid-template-columns: repeat(3, 1fr); } }

.main-index .guide-card {
    display: flex;
    flex-direction: column;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: rgba(15, 26, 48, .6);
    overflow: hidden;
    transition: transform .3s, border-color .3s, box-shadow .3s;
}

.main-index .guide-card:hover {
    border-color: rgba(79, 124, 255, .3);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, .4);
}

/* 图标形态的封面 */
.main-index .guide-img {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    overflow: hidden;
    background: #0f1a30;
}

.main-index .guide-img.guide-icon {
    height: 200px;
}

.main-index .guide-img.guide-icon i {
    transition: transform .4s ease;
}

.main-index .guide-card:hover .guide-img.guide-icon i {
    transform: scale(1.12) rotate(-4deg);
}

/* 图片形态的封面（保留兼容） */
.main-index .guide-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .4s ease;
}

.main-index .guide-card:hover .guide-img img { transform: scale(1.04); }

.main-index .guide-content {
    display: flex;
    flex: 1;
    flex-direction: column;
    padding: 1.2rem 1.5rem 1.5rem;
}

.main-index .guide-content h3 a {
    display: block;
    margin-bottom: .4rem;
    color: #fff;
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.45;
    transition: color .2s;
}

.main-index .guide-content h3 a:hover { color: var(--accent); }

.main-index .guide-content p {
    flex: 1;
    color: var(--text-muted);
    font-size: .88rem;
    line-height: 1.7;
}

.main-index .guide-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: .8rem;
    padding-top: .6rem;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: .8rem;
}

.main-index .guide-meta .date {
    display: flex;
    align-items: center;
    gap: .3rem;
}

.main-index .guide-meta .read-more {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    color: var(--accent);
    font-weight: 500;
    transition: gap .2s;
}

.main-index .guide-meta .read-more:hover { gap: .8rem; }
.main-index .guide-meta .read-more i { font-size: .7rem; }


/* ============================================================
   16  FAQ
   ============================================================ */
.main-index .faq-section {
    padding: 3rem 1rem 4rem;
    background: var(--bg-dark);
}

.main-index .faq-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.2rem;
    margin-top: 2.5rem;
}

@media (min-width: 768px) {
    .main-index .faq-grid { grid-template-columns: repeat(2, 1fr); }
}

.main-index .faq-card {
    padding: 1.4rem 1.6rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: rgba(10, 17, 34, .5);
    backdrop-filter: blur(6px);
    cursor: pointer;
    transition: border-color .3s, box-shadow .3s, transform .3s;
}

.main-index .faq-card:hover {
    border-color: rgba(79, 124, 255, .3);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, .4);
}

.main-index .faq-card .faq-q {
    display: flex;
    align-items: center;
    gap: .6rem;
    margin-bottom: .6rem;
    color: #fff;
    font-size: clamp(1rem, 1.1vw, 1.15rem);
    font-weight: 700;
}

.main-index .faq-card .faq-q i {
    flex-shrink: 0;
    color: var(--accent);
    font-size: .9rem;
}

.main-index .faq-card > div:not(.faq-q) {
    padding: .5rem 0 0 1.8rem;
    color: var(--text-muted);
    font-size: .9rem;
    line-height: 1.8;
}

.main-index .faq-card > div:not(.faq-q) strong {
    color: #eaf0ff;
    font-weight: 600;
}

@media (max-width: 480px) {
    .main-index .faq-card { padding: 1rem 1.2rem; }
    .main-index .faq-card > div:not(.faq-q) {
        padding-left: .8rem;
        font-size: .82rem;
    }
}


/* ============================================================
   17  响应式
   ============================================================ */
@media (max-width: 820px) {
    .container { width: 100%; }
    .logo img { height: 1.2rem; }

    .main-index .hero { min-height: 44vh; }
    .main-index .subs-inner { min-height: auto; padding: 2.5rem 1rem; }
    .main-index .subscription { min-height: auto; }

    .footer-inner {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
        text-align: center;
    }
    .footer-brand { max-width: 100%; text-align: center; }
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem 2rem;
        max-width: 100%;
        width: 100%;
    }
    .footer-links ul li:first-child::after {
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 480px) {
    .main-index .hero-content .badge { font-size: .65rem; }
    .main-index .subs-timer .time-box {
        min-width: 2.2rem;
        padding: .1rem .5rem;
        font-size: 1rem;
    }
    .main-index .stats-metrics { gap: .8rem; }
    .main-index .download-grid { grid-template-columns: 1fr; }
    .main-index .download-item { padding: 1rem; }
    .main-index .guide-img { height: 170px; }
    .main-index .guide-content { padding: 1rem 1.2rem 1.2rem; }
    .main-index .guide-content h3 a { font-size: .95rem; }
    .main-index .guide-content p { font-size: .82rem; }

    .footer { padding: 2.5rem .5rem 1.2rem; }
    .footer-links { grid-template-columns: 1fr 1fr; gap: 1.2rem; }
    .footer-links ul li:first-child { font-size: .8rem; }
    .footer-links ul a { font-size: .75rem; }
    .footer-brand .logo-footer img { height: 2rem; }
    .footer-brand .brand-desc { font-size: .75rem; }
    .footer-bottom { margin-top: 2rem; padding-top: 1rem; font-size: .6rem; }
}