/* ============================================
   1. 全局变量与基础重置
   ============================================ */
:root {
    --cyan: #009BF7;
    --cyan-d: #0f93c6;
    --amber: #f97316;
    --amber-d: #e07e00;
    --ink: #14263a;
    --muted: #5b6b7b;
    --line: #e7edf3;
    --bg: #fff;
    --bg-soft: #f4f9fc;
    --bg-dark: #0e1b29;
    --radius: 12px;
    --shadow: 0 24px 60px rgba(20, 40, 60, .12);
    --maxw: 1200px;
}

/* Search-friendly documentation guides. */
.seo-guides { padding-top:44px; background:var(--bg-soft); }
.seo-guide-grid {  
    display: grid;
    grid-template-columns:repeat(3, 1fr);
    gap: 20px;
}
.seo-guide-grid .card { padding:26px; }
.seo-guide-grid h3 { margin-bottom:10px; font-size:19px; }
.seo-guide-grid p { color:var(--muted); }
.seo-guide-action { margin:30px 0 58px; text-align:center; }
.seo-faq { max-width:860px; margin:0 auto; }
.seo-faq h2 { margin-bottom:18px; text-align:center; font-size:28px; }
.seo-faq details { padding:16px 18px; border-top:1px solid var(--line); background:#fff; }
.seo-faq details:last-child { border-bottom:1px solid var(--line); }
.seo-faq summary { color:var(--ink); font-weight:700; cursor:pointer; }
.seo-faq p { margin:10px 0 0; color:var(--muted); }
@media (max-width:920px) { .seo-guide-grid { grid-template-columns:1fr; } }
.feature-detail-link { color:var(--ink); text-decoration:none; }
.feature-detail-link:hover { color:var(--cyan); text-decoration:underline; }
.seo-detail { max-width:900px; }
.seo-detail h1 { margin:10px 0 14px; font-size:36px; }
.seo-detail .lead { max-width:760px; margin-bottom:28px; color:var(--muted); font-size:18px; }
.seo-detail .compare-table { margin:26px 0; }
.seo-detail .seo-article { max-width:none; margin:24px 0; }

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei UI", "Segoe UI", system-ui, sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ============================================
   2. 通用组件
   ============================================ */

/* 2.1 容器 */
.wrap {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 16px;
}

/* 2.2 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 999px;
    padding: 10px 30px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: .18s;
    white-space: nowrap;
}

.btn-primary {
    background: var(--cyan);
    color: #fff;
}
.btn-primary:hover {
    background: var(--cyan-d);
    transform: translateY(-1px);
}

.btn-amber {
    background: var(--amber);
    color: #fff;
    box-shadow: 0 12px 26px rgba(247, 166, 0, .34);
}
.btn-amber:hover {
    background: var(--amber-d);
    transform: translateY(-1px);
}

.btn-ghost {
    background: #fff;
    color: var(--ink);
    border: 1.5px solid var(--line);
}
.btn-ghost:hover {
    border-color: var(--cyan);
    color: var(--cyan-d);
}

/* 2.3 装饰元素 */
.eyebrow {
    display: inline-block;
    color: var(--cyan);
    background: rgba(22, 171, 227, .10);
    font-weight: 700;
    font-size: 14px;
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: 16px;
}

.highlight-orange {
    color: #f97316;
}

/* 2.4 通用区块 */
.sec {
    padding: 96px 0;
}

.sec-head {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 56px;
}
.sec-head h2 {
    font-size: 36px;
    letter-spacing: -.6px;
}
.sec-head p {
    color: var(--muted);
    margin-top: 14px;
    font-size: 17px;
}

/* 2.5 媒体容器 */
.media-frame {
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* 2.6 滚动入场动画 */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: .7s cubic-bezier(.2, .7, .2, 1);
}
.reveal.in {
    opacity: 1;
    transform: none;
}

/* ============================================
   3. 顶部导航
   ============================================ */
header {
    position: sticky;
    top: 0;
    z-index: 60;
    background: rgba(255, 255, 255, .85);
    backdrop-filter: saturate(160%) blur(12px);
    border-bottom: 1px solid transparent;
    transition: .2s;
}
header.scrolled {
    border-color: var(--line);
    box-shadow: 0 4px 20px rgba(20, 40, 60, .05);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 90px;
}

.logo img {
    height: 40px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 50px;
    font-weight: 600;
    font-size: 1rem;
}
.nav-links a {
    color: var(--ink);
    font-weight: 600;
    font-size: 18px;
}
.nav-links a:hover {
    color: var(--amber);
}

/* 3.1 汉堡菜单按钮（移动端） */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 69;
}
.menu-toggle span {
    display: block;
    width: 26px;
    height: 2.5px;
    background: var(--ink);
    border-radius: 2px;
    transition: 0.3s ease;
}
.menu-toggle.active span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* 3.2 语言选择器 */
.lang-selector {
    position: relative;
    display: inline-block;
    background-color: #eeeeee;
    border-radius: 99px;
    padding: 2px;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    background: transparent;
    border: none;
    color: var(--ink);
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 99px;
    transition: 0.2s;
}
.lang-btn:hover {
    background: rgba(0, 155, 247, 0.08);
}

.lang-current {
    font-size: 15px;
}

.lang-arrow {
    transition: transform 0.25s ease;
}
.lang-selector.open .lang-arrow {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    min-width: 120px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: 0 16px 48px rgba(20, 40, 60, 0.14);
    padding: 6px 0;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px) scale(0.96);
    transition: 0.2s ease;
    transform-origin: top right;
    z-index: 100;
}
.lang-selector.open .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.lang-dropdown li {
    padding: 8px 18px;
    font-size: 14px;
    color: var(--ink);
    cursor: pointer;
    transition: 0.15s;
}
.lang-dropdown li:hover {
    background: rgba(0, 155, 247, 0.08);
    color: var(--cyan-d);
}
.lang-dropdown li.active-lang {
    color: var(--cyan);
    font-weight: 600;
}

/* ============================================
   4. Hero 区域
   ============================================ */
.hero {
    position: relative;
    overflow: hidden;
    text-align: center;
    background:
        radial-gradient(1200px 520px at 50% -12%, rgba(22, 171, 227, .2), transparent 60%),
        radial-gradient(700px 360px at 12% 6%, rgba(247, 166, 0, .2), transparent 60%),
        var(--bg-soft);
}

.hero-inner {
    padding: 80px 16px;
}

.hero h1 {
    font-size: 58px;
    line-height: 1.1;
    letter-spacing: -1.6px;
    max-width: 1180px;
    margin: 0 auto;
}
.hero h1 .hl {
    color: var(--cyan);
}
.hero h1 .hl2 {
    color: var(--amber);
}

.hero .lead {
    font-size: 20px;
    color: var(--muted);
    max-width: 620px;
    margin: 24px auto 32px;
}

.hero-actions {
    display: flex;
    gap: 38px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-meta {
    margin-top: 18px;
    color: var(--muted);
    font-size: 14px;
}

.hero-shot {
    max-width: 1200px;
    margin: 64px auto -120px;
    position: relative;
}
.hero-shot .ph {
    height: 910px;
}

/* ============================================
   5. 信任条
   ============================================ */
.strip {
    background: var(--bg);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.strip-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    padding: 40px 0;
    text-align: center;
}

.strip .n {
    font-size: 30px;
    font-weight: 800;
    color: var(--cyan);
}
.strip .l {
    color: var(--muted);
    font-size: 14px;
    margin-top: 4px;
}

/* ============================================
   6. 功能展示
   ============================================ */
.show {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    padding: 60px 0;
}
.show.reverse .show-text {
    order: 2;
}

.show-text h3 {
    font-size: 30px;
    letter-spacing: -.5px;
}
.show-text p {
    color: var(--muted);
    margin-top: 14px;
    font-size: 17px;
}

.show-list {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 11px;
}
.show-list li {
    list-style: none;
    display: flex;
    gap: 10px;
    align-items: flex-start;
    color: #33485c;
    font-size: 15.5px;
}
.show-list li svg {
    width: 21px;
    height: 21px;
    flex: 0 0 21px;
    margin-top: 3px;
    stroke: var(--cyan);
    fill: none;
    stroke-width: 2.4;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.show.amber .show-list li svg {
    stroke: var(--amber);
}

/* ============================================
   7. 更多功能卡片
   ============================================ */
.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 24px;
    transition: .2s;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: transparent;
}

.card .ico {
    width: 44px;
    height: 44px;
    border-radius: 11px;
    display: grid;
    place-items: center;
    margin-bottom: 14px;
    background: rgba(22, 171, 227, .12);
}
.card .ico svg {
    width: 23px;
    height: 23px;
    stroke: var(--cyan-d);
    fill: none;
    stroke-width: 1.9;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.card:nth-child(2n) .ico {
    background: rgba(247, 166, 0, .14);
}
.card:nth-child(2n) .ico svg {
    stroke: var(--amber-d);
}

.card h4 {
    font-size: 16.5px;
    margin-bottom: 6px;
}
.card p {
    color: var(--muted);
    font-size: 14px;
}

/* ============================================
   8. 下载区
   ============================================ */
.download {
    background: var(--bg-dark);
    color: #fff;
}

.dl-grid {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 48px;
    align-items: center;
}
.dl-grid h2 {
    font-size: 38px;
    letter-spacing: -.6px;
}
.dl-grid p {
    color: #9fb3c4;
    margin-top: 14px;
    font-size: 17px;
}

.dl-card {
    background: #13243a;
    border: 1px solid #21384f;
    border-radius: var(--radius);
    padding: 34px;
}

.dl-card .ver {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 18px;
}
.dl-card .ver b {
    font-size: 24px;
}
.dl-card .ver span {
    color: #8fa6ba;
    font-size: 14px;
}

.dl-meta {
    display: flex;
    flex-direction: column;
    gap: 9px;
    margin: 20px 0 24px;
    color: #b9c9d6;
    font-size: 14px;
}
.dl-meta div {
    display: flex;
    gap: 9px;
}
.dl-meta svg {
    width: 18px;
    height: 18px;
    stroke: var(--cyan);
    fill: none;
    stroke-width: 2;
    flex: 0 0 18px;
}

.dl-card .btn-primary {
    width: 100%;
    justify-content: center;
}

.dl-card .hist {
    display: block;
    text-align: center;
    margin-top: 14px;
    color: #8fa6ba;
    font-size: 13px;
}
.dl-card .hist:hover {
    color: #fff;
}

/* ============================================
   9. 价格版块
   ============================================ */
.price-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.plan {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 36px 32px;
    position: relative;
}
.plan.pro {
    border: 2px solid var(--cyan);
    box-shadow: var(--shadow);
}
.plan.max {
    border: 2px solid var(--amber);
    box-shadow: var(--shadow);
}

.plan .protag {
    position: absolute;
    top: -18px;
    right: 28px;
    background: var(--cyan);
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    padding: 4px 13px;
    border-radius: 999px;
}
.plan .maxtag {
    position: absolute;
    top: -18px;
    right: 28px;
    background: var(--amber);
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    padding: 4px 13px;
    border-radius: 999px;
}

.plan h3 {
    font-size: 21px;
}

.plan .price {
    font-size: 42px;
    font-weight: 800;
    margin: 12px 0 2px;
}
.plan .price small {
    font-size: 15px;
    font-weight: 600;
    color: var(--muted);
}

.plan ul {
    margin: 20px 0 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.plan li {
    list-style: none;
    display: flex;
    gap: 9px;
    color: #3a4f61;
    font-size: 14.5px;
}
.plan li svg {
    width: 19px;
    height: 19px;
    flex: 0 0 19px;
    margin-top: 3px;
    stroke: var(--cyan);
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.plan.pro li svg {
    stroke: var(--amber);
}

.plan .btn {
    width: 100%;
    justify-content: center;
}

/* ============================================
   10. FAQ
   ============================================ */
.faq {
    max-width: 800px;
    margin: 0 auto;
}

details {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 2px 22px;
    margin-bottom: 14px;
}

summary {
    cursor: pointer;
    font-weight: 600;
    padding: 18px 0;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
summary::-webkit-details-marker {
    display: none;
}
summary::after {
    content: "+";
    color: var(--cyan);
    font-size: 22px;
}
details[open] summary::after {
    content: "–";
}

details p {
    color: var(--muted);
    padding: 0 0 18px;
    font-size: 15px;
}

/* ============================================
   11. 页脚
   ============================================ */
footer {
    background: var(--bg-soft);
    border-top: 1px solid var(--line);
    padding: 64px 0 40px;
}

.foot-grid {
    display: grid;
    grid-template-columns: 2.5fr 1fr 1fr 1fr 1fr;
    gap: 32px;
}
.foot-grid h5 {
    font-size: 14px;
    color: var(--ink);
    margin-bottom: 16px;
}
.foot-grid a,
.foot-grid p {
    display: block;
    color: var(--muted);
    font-size: 14px;
    margin-bottom: 10px;
}
.foot-grid a:hover {
    color: var(--cyan-d);
}

.foot-bottom {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
    text-align: center;
    color: var(--muted);
    font-size: 13px;
}

/* ============================================
   12. 返回顶部按钮
   ============================================ */
.go-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, #009BF7, #0f93c6);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    box-shadow: 0 8px 28px rgba(0, 155, 247, 0.35);
    border: none;
    cursor: pointer;
    transition: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    opacity: 0;
    visibility: hidden;
    transform: scale(0.7) translateY(20px);
    z-index: 70;
    text-decoration: none;
}
.go-top.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1) translateY(0);
}
.go-top:hover {
    transform: scale(1.1) translateY(-2px);
    box-shadow: 0 12px 36px rgba(0, 155, 247, 0.45);
}
.go-top:active {
    transform: scale(0.92);
}

.go-top::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 155, 247, 0.2), rgba(247, 166, 0, 0.15));
    z-index: -1;
    animation: goTopPulse 2.4s ease-in-out infinite;
}
@keyframes goTopPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.25);
        opacity: 0.15;
    }
}

.go-top svg {
    width: 24px;
    height: 24px;
    fill: none;
    stroke: #fff;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* ============================================
   13. 轮播字符动画
   ============================================ */
#carousel-wrapper {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 60px;
    min-height: 1.4em;
    position: relative;
}

#carousel-word {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    font-weight: 700;
    color: #fbbf24;
    letter-spacing: 0.02em;
    position: relative;
    white-space: nowrap;
}

.char {
    display: inline-block;
    opacity: 0;
    transform: scale(0.6) translateY(8px);
    animation: charPop 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    will-change: transform, opacity;
    position: relative;
}
@keyframes charPop {
    0% {
        opacity: 0;
        transform: scale(0.6) translateY(10px);
        filter: blur(2px);
    }
    40% {
        opacity: 1;
        transform: scale(1.12) translateY(-2px);
        filter: blur(0);
    }
    70% {
        transform: scale(0.96) translateY(1px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
        filter: blur(0);
    }
}

.char.hl-color {
    color: #f97316;
}
.char.hl2-color {
    color: #009BF7;
}
.char.default-color {
    color: #fbbf24;
}

#carousel-word.pop-glow {
    animation: glowPulse 0.6s ease-out;
}
@keyframes glowPulse {
    0% {
        text-shadow: 0 0 0 rgba(251, 191, 36, 0);
    }
    30% {
        text-shadow: 0 0 30px rgba(251, 191, 36, 0.3), 0 0 60px rgba(251, 191, 36, 0.1);
    }
    100% {
        text-shadow: 0 0 0 rgba(251, 191, 36, 0);
    }
}

/* ============================================
   14. 内页通用组件
   ============================================ */

/* 14.1 Banner */
.page-banner {
    padding: 80px 0 60px;
    text-align: center;
    background:
        radial-gradient(ellipse 800px 400px at 20% 30%, rgba(0, 155, 247, 0.25) 0%, transparent 70%),
        radial-gradient(ellipse 600px 400px at 80% 70%, rgba(247, 166, 0, 0.18) 0%, transparent 70%),
        var(--bg-soft);
    border-bottom: 1px solid var(--line);
    position: relative;
    overflow: hidden;
}
.page-banner::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cyan), var(--amber), transparent);
    opacity: 0.5;
}
.page-banner h1 {
    font-size: 42px;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}
.page-banner p {
    color: var(--muted);
    font-size: 18px;
    max-width: 560px;
    margin: 0 auto;
}

/* 14.2 侧边栏布局 */
.page-main {
    display: flex;
    gap: 0;
    padding: 48px 0 80px;
    align-items: flex-start;
}

.page-content {
    flex: 1;
    min-width: 0;
    padding-right: 48px;
}
.page-content h2 {
    font-size: 28px;
    margin-top: 0;
    margin-bottom: 16px;
    letter-spacing: -0.3px;
}
.page-content h3 {
    font-size: 20px;
    margin-top: 32px;
    margin-bottom: 10px;
}
.page-content p {
    color: var(--muted);
    line-height: 1.8;
    margin-bottom: 16px;
}
.page-content ul {
    color: var(--muted);
    line-height: 1.8;
    padding-left: 22px;
    margin-bottom: 16px;
}
.page-content li {
    margin-bottom: 4px;
}

.page-sidebar {
    width: 220px;
    flex-shrink: 0;
    padding-left: 32px;
    border-left: 1.5px solid var(--line);
}
.page-sidebar .sidebar-title {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--muted);
    margin-bottom: 18px;
}
.page-sidebar a {
    display: block;
    padding: 8px 0;
    font-size: 15px;
    color: var(--muted);
    border-bottom: 1px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}
.page-sidebar a:hover {
    color: var(--cyan);
    border-bottom-color: var(--cyan);
}
.page-sidebar a.active {
    color: var(--ink);
    font-weight: 600;
    border-bottom-color: var(--cyan);
}

/* 14.3 联系方式 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin: 60px 0 70px;
}

.contact-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 32px 28px 28px;
    box-shadow: 0 8px 30px rgba(20, 40, 60, 0.06);
    border: 1px solid var(--line);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    text-align: center;
}
.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 50px rgba(20, 40, 60, 0.10);
    border-color: var(--cyan);
}

.contact-card .icon-wrap {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(0, 155, 247, 0.08);
    color: var(--cyan);
    font-size: 26px;
    font-weight: 600;
    margin-bottom: 16px;
}
.contact-card h4 {
    font-size: 18px;
    margin-bottom: 6px;
}
.contact-card .email {
    display: block;
    font-size: 20px;
    font-weight: 600;
    color: var(--cyan);
    margin: 10px 0 12px;
    word-break: break-all;
}
.contact-card .email:hover {
    color: var(--cyan-d);
}
.contact-card .desc {
    color: var(--muted);
    font-size: 14px;
    line-height: 1.7;
}

/* 14.4 二维码 */
.qr-section {
    text-align: center;
    padding: 30px 0 20px;
    border-top: 1px solid var(--line);
}
.qr-section h3 {
    font-size: 26px;
    margin-bottom: 10px;
}
.qr-section .sub {
    color: var(--muted);
    margin-bottom: 32px;
}

.qr-grid {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
}

.qr-item {
    text-align: center;
}
.qr-item .qr-box {
    width: 130px;
    height: 130px;
    background: #f8fafc;
    border-radius: var(--radius);
    border: 2px dashed var(--line);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    transition: border-color 0.2s;
    font-size: 13px;
    color: var(--muted);
}
.qr-item:hover .qr-box {
    border-color: var(--cyan);
}
.qr-item .label {
    font-weight: 600;
    font-size: 15px;
}
.qr-item .label small {
    font-weight: 400;
    color: var(--muted);
    font-size: 13px;
}

/* 14.5 版本信息条 */
.version-strip {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    flex-wrap: wrap;
    padding: 16px 0 8px;
    font-size: 14px;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
}
.version-strip .tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 155, 247, 0.08);
    color: var(--cyan);
    padding: 4px 14px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 13px;
}
.version-strip .tag svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}
.version-strip .date {
    display: flex;
    align-items: center;
    gap: 6px;
}
.version-strip .date svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

/* 14.6 下载卡片 */
.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 40px 0 50px;
}

.download-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 32px 28px 28px;
    text-align: center;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    position: relative;
    overflow: hidden;
}
.download-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow);
    border-color: var(--cyan);
}
.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--cyan), var(--amber), var(--cyan));
    background-size: 200% 100%;
    opacity: 0;
    transition: opacity 0.4s ease;
}
.download-card:hover::before {
    opacity: 1;
    animation: shimmer 2s infinite linear;
}
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

.download-card .os-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
}
.download-card h3 {
    font-size: 22px;
    margin-bottom: 4px;
}
.download-card .os-desc {
    color: var(--muted);
    font-size: 14px;
    margin-bottom: 18px;
}
.download-card .file-info {
    color: var(--muted);
    font-size: 13px;
    margin-bottom: 18px;
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}
.download-card .file-info span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.download-card .btn {
    width: 100%;
    justify-content: center;
    font-size: 16px;
    padding: 12px 20px;
}

/* 14.7 下载注意事项 */
.download-notes {
    margin: 0 auto 30px;
    padding: 28px 32px;
    background: var(--bg-soft);
    border-radius: var(--radius);
    border: 1px solid var(--line);
}
.download-notes h4 {
    font-size: 16px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.download-notes ul {
    padding-left: 20px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.9;
}
.download-notes ul li {
    margin-bottom: 2px;
}
.download-notes ul li strong {
    color: var(--ink);
}

/* 14.8 专业版介绍 */
.pro-intro {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 40px;
    padding: 32px 28px;
    background: linear-gradient(135deg, rgba(0, 155, 247, 0.04), rgba(247, 166, 0, 0.04));
    border-radius: var(--radius);
    border: 1px solid var(--line);
}
.pro-intro .badge {
    display: inline-block;
    background: var(--amber);
    color: #fff;
    font-weight: 700;
    font-size: 13px;
    padding: 4px 16px;
    border-radius: 999px;
    margin-bottom: 12px;
}
.pro-intro h3 {
    font-size: 24px;
    margin-bottom: 8px;
}
.pro-intro h3 .highlight {
    color: var(--amber);
}
.pro-intro p {
    color: var(--muted);
    font-size: 16px;
    line-height: 1.8;
}
.pro-intro .price-tag {
    display: inline-block;
    margin-top: 12px;
    font-size: 28px;
    font-weight: 700;
    color: var(--ink);
}
.pro-intro .price-tag small {
    font-size: 16px;
    font-weight: 400;
    color: var(--muted);
}

/* 14.9 对比表格 */
.compare-wrap {
    overflow-x: auto;
    margin: 20px 0 40px;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: 0 4px 20px rgba(20, 40, 60, 0.04);
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
    min-width: 600px;
}

/* 表头 */
.compare-table thead th {
    padding: 16px 20px;
    text-align: left;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.3px;
    color: var(--muted);
    background: var(--bg-soft);
    border-bottom: 2px solid var(--line);
}
.compare-table thead th:first-child {
    width: 28%;
}
.compare-table thead th:nth-child(2),
.compare-table thead th:nth-child(3) {
    width: 16%;
    text-align: center;
}
.compare-table thead th:last-child {
    width: 40%;
}

.compare-table thead .version-name {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 16px;
    font-weight: 700;
    color: var(--ink);
}
.compare-table thead .version-name .free-tag {
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
    background: var(--bg-soft);
    padding: 2px 10px;
    border-radius: 999px;
}
.compare-table thead .version-name .pro-tag {
    font-size: 12px;
    font-weight: 600;
    color: #fff;
    background: var(--amber);
    padding: 2px 10px;
    border-radius: 999px;
}

/* 表格行 - 交替颜色 */
.compare-table tbody tr:nth-child(odd) {
    background: #fff;
}
.compare-table tbody tr:nth-child(even) {
    background: var(--bg-soft);
}

.compare-table tbody td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--line);
    vertical-align: middle;
    line-height: 1.6;
}

/* 第一列：功能名称 */
.compare-table tbody td:first-child {
    font-weight: 600;
    color: var(--ink);
    font-size: 15px;
}

/* 第二、三列：✓ / ✗ 符号 */
.compare-table tbody td:nth-child(2),
.compare-table tbody td:nth-child(3) {
    text-align: center;
    font-size: 22px;
    font-weight: 700;
}

.compare-table .icon-check {
    color: var(--cyan);
}
.compare-table .icon-check-pro {
    color: var(--amber);
}
.compare-table .icon-cross {
    color: #d1d5db;
}
.compare-table .icon-partial {
    color: var(--cyan);
    font-weight: 700;
}

/* 第四列：说明文字 */
.compare-table tbody td:last-child {
    color: var(--muted);
    font-size: 14px;
}
.compare-table tbody td:last-child strong {
    color: var(--ink);
    font-weight: 600;
}

/* 最后一行无边框 */
.compare-table tbody tr:last-child td {
    border-bottom: none;
}

/* 表格底部操作 */
.compare-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    padding: 20px 0 10px;
}
.compare-actions .btn {
    min-width: 160px;
    justify-content: center;
}

/* 14.10 帮助中心 - 两栏布局 */
.help-wrapper {
    display: flex;
    gap: 0;
    margin: 50px auto 70px;
    align-items: stretch;
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.02);
}

.help-content {
    flex: 1;
    padding: 40px 48px 48px 48px;
    min-height: 420px;
}
.help-content h2 {
    font-size: 26px;
    margin-top: 0;
    margin-bottom: 16px;
    color: var(--text);
}
.help-content p {
    color: var(--muted);
    line-height: 1.8;
    margin-bottom: 18px;
}
.help-content img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 24px auto;
}
.help-content hr {
    border: 0;
    border-top: 1px solid var(--line);
    margin: 28px 0;
}
.help-content a {
    color: var(--cyan);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.help-content ul,
.help-content ol {
    margin: 14px 0 18px;
    padding-left: 1.7em;
    color: var(--muted);
}
.help-content li {
    margin: 7px 0;
    padding-left: 4px;
}
html[dir="rtl"] body {
    direction: rtl;
    text-align: right;
}
html[dir="rtl"] .nav,
html[dir="rtl"] .nav-links,
html[dir="rtl"] .hero-actions,
html[dir="rtl"] .foot-grid,
html[dir="rtl"] .show,
html[dir="rtl"] .show.reverse {
    direction: rtl;
}
html[dir="rtl"] .help-sidebar {
    border-left: none;
    border-right: 1px solid #e5e7eb;
}
html[dir="rtl"] .help-content ul,
html[dir="rtl"] .help-content ol {
    padding-left: 0;
    padding-right: 1.7em;
}
html[dir="rtl"] .help-content li {
    padding-left: 0;
    padding-right: 4px;
}
.help-content .meta {
    font-size: 14px;
    color: var(--muted-light);
    border-top: 1px solid var(--line);
    padding-top: 20px;
    margin-top: 30px;
}

.help-sidebar {
    width: 240px;
    flex-shrink: 0;
    padding: 40px 20px 48px 28px;
    border-left: 1px solid #e5e7eb;
    background: #fafbfc;
}
.help-sidebar h5 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--muted-light);
    margin: 0 0 16px 0;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--line);
}
.help-sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.help-sidebar li {
    margin-bottom: 2px;
}
.help-sidebar a {
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--text);
    font-size: 15px;
    transition: background 0.15s, color 0.15s;
    text-decoration: none;
}
.help-sidebar a:hover {
    background: rgba(0, 155, 247, 0.06);
    color: var(--cyan);
}
.help-sidebar a.active {
    background: rgba(0, 155, 247, 0.08);
    color: var(--cyan);
    font-weight: 600;
}

.help-sidebar .has-sub > a {
    position: relative;
}
.help-sidebar .has-sub > a::after {
    content: '▾';
    position: absolute;
    right: 12px;
    font-size: 12px;
    color: var(--muted-light);
    transition: transform 0.2s;
}
.help-sidebar .has-sub.open > a::after {
    transform: rotate(180deg);
}

.help-sidebar .sub-menu {
    list-style: none;
    padding: 0;
    margin: 2px 0 6px 12px;
    display: none;
    border-left: 2px solid var(--line);
    padding-left: 12px;
}
.help-sidebar .has-sub.open .sub-menu {
    display: block;
}
.help-sidebar .sub-menu a {
    font-size: 14px;
    padding: 6px 12px;
    color: var(--muted);
}
.help-sidebar .sub-menu a:hover {
    color: var(--cyan);
    background: transparent;
}

/* ============================================
   15. 响应式
   ============================================ */

/* 15.1 平板设备 (≤ 920px) */
@media (max-width: 920px) {

    /* 导航 */
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        right: -100%;
        width: 220px;
        height: 100vh;
        background: #fff;
        flex-direction: column;
        padding: 80px 28px 32px;
        gap: 6px;
        box-shadow: -8px 0 40px rgba(20, 40, 60, 0.10);
        transition: right 0.35s cubic-bezier(0.22, 1, 0.36, 1);
        overflow-y: auto;
        z-index: 60;
        border-left: 1px solid var(--line);
    }
    .nav-links.open {
        right: 0;
        display: flex;
    }

    .nav-links a {
        display: block;
        padding: 12px 16px;
        font-size: 18px;
        border-radius: 10px;
        transition: 0.15s;
    }
    .nav-links a:hover {
        background: rgba(0, 155, 247, 0.06);
    }

    /* 语言选择器（移动端适配） */
    .lang-selector {
        margin-top: 4px;
    }
    .lang-btn {
        width: 100%;
        justify-content: space-between;
        padding: 10px 14px;
        border-radius: 99px;
        font-size: 17px;
    }
    .lang-btn:hover {
        background: rgba(0, 155, 247, 0.06);
    }
    .lang-dropdown {
        position: absolute;
        top: calc(100% + 6px);
        min-width: 120px;
        background: #fff;
        border: 1px solid var(--line);
        border-radius: 12px;
        box-shadow: 0 16px 48px rgba(20, 40, 60, 0.14);
        padding: 6px 0;
        list-style: none;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-6px) scale(0.96);
        transition: 0.2s ease;
        transform-origin: top right;
        z-index: 59;
    }
    .lang-selector.open .lang-dropdown {
        max-height: 600px;
        padding: 4px 0 8px 16px;
    }
    .lang-dropdown li {
        padding: 8px 16px;
    }

    /* 布局 */
    .show,
    .dl-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .show.reverse .show-text {
        order: 0;
    }

    .grid {
        grid-template-columns: 1fr 1fr;
    }

    .strip-grid {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }

    .price-grid {
        grid-template-columns: 1fr;
    }

    .foot-grid {
        grid-template-columns: 1fr 1fr;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero-shot {
        margin-bottom: -60px;
    }
    .hero-shot .ph {
        height: auto;
    }

    .sec {
        padding: 64px 0;
    }

    /* 内页 */
    .page-banner {
        padding: 60px 0 40px;
    }
    .page-banner h1 {
        font-size: 32px;
    }

    .page-main {
        flex-direction: column-reverse;
        padding: 32px 0 60px;
    }
    .page-content {
        padding-right: 0;
    }
    .page-sidebar {
        width: 100%;
        padding-left: 0;
        padding-bottom: 24px;
        margin-bottom: 32px;
        border-left: none;
        border-bottom: 1.5px solid var(--line);
    }

    .help-wrapper {
        flex-direction: column;
        margin: 30px 0 50px;
    }
    .help-sidebar {
        width: 100%;
        border-left: none;
        border-top: 1px solid #e5e7eb;
        padding: 24px 20px 20px;
        order: 2;
    }
    .help-content {
        padding: 30px 24px;
        order: 1;
    }
    .help-sidebar .sub-menu {
        margin-left: 8px;
        padding-left: 10px;
    }

    .contact-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
    .download-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
    .qr-grid {
        gap: 30px;
    }
    .qr-item .qr-box {
        width: 110px;
        height: 110px;
    }
    .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 999px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: .18s;
    white-space: nowrap;
    }
    .strip .n {
    font-size: 20px;
    font-weight: 800;
    color: var(--cyan);
    }
    .plan .protag {
    position: absolute;
    top: -18px;
    right: 28px;
    background: var(--cyan);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    padding: 4px 13px;
    border-radius: 999px;
    }
}

/* 15.2 手机设备 (≤ 600px) */
@media (max-width: 600px) {

    .page-banner h1 {
        font-size: 26px;
    }
    .page-banner p {
        font-size: 15px;
    }

    .page-content {
        padding: 24px 18px;
    }
    .page-content h2 {
        font-size: 22px;
    }

    .page-sidebar {
        padding: 18px 16px;
    }
    .page-sidebar a {
        font-size: 14px;
        padding: 6px 10px;
    }

    .help-content {
        padding: 24px 18px;
    }
    .help-content h2 {
        font-size: 22px;
    }
    .help-sidebar {
        padding: 18px 16px;
    }
    .help-sidebar a {
        font-size: 14px;
        padding: 6px 10px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        margin: 40px 0 50px;
    }
    .contact-card {
        padding: 24px 18px;
    }
    .contact-card .email {
        font-size: 17px;
    }

    .download-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .qr-grid {
        gap: 24px;
    }
    .qr-item .qr-box {
        width: 100px;
        height: 100px;
    }
    .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 999px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: .18s;
    white-space: nowrap;
    }
    .strip .n {
    font-size: 20px;
    font-weight: 800;
    color: var(--cyan);
    }
    .plan .protag {
    position: absolute;
    top: -18px;
    right: 28px;
    background: var(--cyan);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    padding: 4px 13px;
    border-radius: 999px;
    }
}