:root {
    --brand-blue: #193963;
    --brand-blue-hover: #132b4f;
    --brand-blue-light: #3868a0;
    --bg-light: #f5f6f8;
    --bg-dark: #0e161e; /* Deep navy from screenshot */
    --bg-darker: #0a0f14;
    --text-dark: #111111;
    --text-gray: #444444;
    --text-light-gray: #767676;
    --font-main: 'Noto Sans SC', -apple-system, sans-serif;
    --container-width: 1440px;
    --header-height: 128px; /* top-nav 72px + sub-nav 54px + borders */
}

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

html {
    overflow-x: hidden;
}

body {
    font-family: var(--font-main);
    color: var(--text-dark);
    background-color: #ffffff;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    padding-top: var(--header-height);
    overflow-wrap: break-word;
    word-break: break-word;
}

a { text-decoration: none; color: inherit; transition: color 0.2s ease; }
ul { list-style: none; }
img { max-width: 100%; display: block; object-fit: cover; }

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 40px;
}

/* Typography - Emulating the thin, elegant style */
h1, h2, h3 { font-weight: 300; }

.btn-sharp-black {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--brand-blue);
    color: #fff;
    padding: 16px 32px;
    font-size: 15px;
    font-weight: 400;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
}
.btn-sharp-black:hover { background-color: var(--brand-blue-hover); }

.btn-sharp-blue {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--brand-blue);
    color: #fff;
    padding: 14px 28px;
    font-size: 14px;
    font-weight: 400;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
}
.btn-sharp-blue:hover { background-color: var(--brand-blue-hover); }

.link-arrow {
    color: var(--brand-blue);
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
}
.link-arrow i { transition: transform 0.3s ease; }
.link-arrow:hover i { transform: translateX(5px); }

/* === Site Header (fixed wrapper — use #site-header, not bare header/nav tags) === */
#site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1000;
    background: #fff;
}

/* === Header Tier 1 (Logo & Search) === */
.top-nav {
    border-bottom: 1px solid #e5e5e5;
    background: #fff;
}
.top-nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}
.brand-logo {
    font-size: 24px;
    font-weight: 300;
    color: var(--brand-blue);
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: -0.5px;
}
.brand-logo-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
    flex-shrink: 0;
    background-color: #fff;
}

.search-box-wrap {
    position: relative;
    flex: 0 1 500px;
}
.search-box {
    display: flex;
    align-items: center;
    border: 1px solid #767676;
    height: 40px;
    padding: 0 12px 0 16px;
    color: var(--text-light-gray);
    font-size: 14px;
    background: #fff;
}
.search-box:focus-within {
    border-color: var(--brand-blue);
    box-shadow: 0 0 0 1px var(--brand-blue);
}
.search-box-input {
    border: none;
    outline: none;
    width: 100%;
    font-family: inherit;
    font-size: inherit;
    background: transparent;
    color: #333;
}
.search-box-input::placeholder { color: #999; }
.search-box-input::-webkit-search-cancel-button { cursor: pointer; }
.search-box-submit {
    border: none;
    background: none;
    padding: 4px 0 4px 8px;
    cursor: pointer;
    color: var(--text-light-gray);
    line-height: 1;
    flex-shrink: 0;
}
.search-box-submit:hover { color: var(--brand-blue); }
.search-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: #fff;
    border: 1px solid #767676;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.12);
    max-height: min(420px, 60vh);
    overflow-y: auto;
    z-index: 1100;
}
.search-result-item {
    display: block;
    padding: 12px 16px;
    text-decoration: none;
    border-bottom: 1px solid #eee;
    transition: background 0.15s;
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover,
.search-result-item.is-active {
    background: #f2f7fc;
}
.search-result-type {
    display: inline-block;
    font-size: 10px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--brand-blue);
    margin-bottom: 4px;
}
.search-result-title {
    display: block;
    font-size: 14px;
    color: #111;
    line-height: 1.35;
    margin-bottom: 4px;
}
.search-result-desc {
    display: block;
    font-size: 12px;
    color: #666;
    line-height: 1.45;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.search-dropdown-empty {
    padding: 28px 20px;
    text-align: center;
    color: #666;
}
.search-dropdown-empty i {
    font-size: 22px;
    color: #ccc;
    margin-bottom: 12px;
    display: block;
}
.search-dropdown-empty p {
    font-size: 14px;
    color: #333;
    margin-bottom: 8px;
}
.search-dropdown-empty span {
    font-size: 12px;
    color: #999;
}

.user-actions {
    display: flex;
    gap: 28px;
    font-size: 13px;
    color: var(--text-gray);
    align-items: center;
}
.action-item {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.action-item:hover { color: var(--brand-blue); }

/* === Language switcher (header & footer) === */
.lang-switcher {
    position: relative;
}
.lang-switcher-trigger {
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    padding: 0;
}
.lang-switcher-trigger:hover {
    color: var(--brand-blue);
}
.lang-switcher-chevron {
    font-size: 10px;
    transition: transform 0.2s ease;
}
.lang-switcher.is-open .lang-switcher-chevron {
    transform: rotate(180deg);
}
.lang-switcher-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 196px;
    margin: 0;
    padding: 8px 0;
    list-style: none;
    background: #fff;
    border: 1px solid #e5e5e5;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.12);
    z-index: 1100;
}
.lang-switcher--footer .lang-switcher-menu {
    right: auto;
    left: 0;
}
.lang-switcher-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 18px;
    font-size: 13px;
    color: var(--text-gray);
    transition: background 0.15s ease, color 0.15s ease;
}
.lang-switcher-option a {
    display: flex;
    align-items: center;
    flex: 1;
    color: inherit;
}
.lang-switcher-option a:hover {
    color: var(--brand-blue);
}
.lang-switcher-option:hover {
    background: #f5f8fc;
}
.lang-switcher-option.is-active {
    color: var(--brand-blue);
    font-weight: 500;
    background: #f0f5fa;
    cursor: default;
}
.lang-switcher-option.is-active .fa-check {
    font-size: 12px;
    color: var(--brand-blue-light);
}

/* === Header Tier 2 (Main Links) === */
.sub-nav {
    border-bottom: 1px solid #e5e5e5;
    background: #fff;
}
.sub-nav-inner {
    display: flex;
    height: 54px;
    align-items: center;
    gap: 40px;
    font-size: 14px;
    color: var(--text-gray);
}
.sub-nav-inner a {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 100%;
}
.sub-nav-inner a:hover { color: var(--brand-blue); }
.sub-nav-inner a i { font-size: 10px; color: var(--text-light-gray); }

.sub-nav-link {
    position: relative;
}
.sub-nav-link.is-active {
    color: var(--brand-blue);
    font-weight: 500;
}
.sub-nav-link.is-active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--brand-blue);
}

/* === Hero Section === */
.hero {
    background-color: var(--bg-light);
    padding: 100px 0 80px; /* Large negative space */
    position: relative;
}
.hero-layout {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.hero-text {
    flex: 0 0 35%;
    z-index: 10;
}
.hero-badge {
    font-size: 15px;
    color: #333;
    margin-bottom: 20px;
    font-weight: 400;
}
.hero-title {
    font-size: 52px;
    line-height: 1.15;
    color: #000;
    margin-bottom: 24px;
    font-weight: 100; /* Extremely thin */
    letter-spacing: 1px;
}
.hero-desc {
    font-size: 16px;
    color: #444;
    margin-bottom: 24px;
    font-weight: 300;
}
.hero-platforms {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 32px;
}
.hero-platform-tab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border: 1px solid #d0d5dd;
    color: var(--brand-blue);
    font-size: 14px;
    font-weight: 400;
    background: #fff;
    transition: border-color 0.25s ease, background-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}
.hero-platform-tab i {
    font-size: 15px;
}
.hero-platform-tab:hover {
    border-color: var(--brand-blue);
    background: var(--brand-blue);
    color: #fff;
    transform: translateY(-2px);
}
.hero-visual {
    flex: 0 0 65%;
    position: relative;
    display: flex;
    justify-content: flex-end;
}
.hero-carousel {
    width: 85%;
    position: relative;
}
.hero-slides {
    position: relative;
    aspect-ratio: 3 / 2;
    overflow: hidden;
    background: #111;
}
.hero-slide {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.6s ease;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.1);
    pointer-events: none;
}
.hero-slide.is-active {
    opacity: 1;
    z-index: 1;
    pointer-events: auto;
}
.hero-controls {
    position: absolute;
    bottom: 0;
    right: 0;
    z-index: 2;
    display: flex;
    align-items: stretch;
    background: #fff;
}
.hero-pagination {
    padding: 0 20px;
    font-size: 13px;
    color: var(--brand-blue);
    display: flex;
    gap: 15px;
    align-items: center;
}
.hero-nav {
    border: none;
    background: transparent;
    color: inherit;
    padding: 0;
    cursor: pointer;
    line-height: 1;
    font-size: 13px;
}
.hero-nav:hover {
    opacity: 0.7;
}
.hero-counter {
    min-width: 2.5em;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

/* === Black Grid Section (Downloads) === */
.grid-band {
    background-color: #000;
    padding-bottom: 20px;
}
.grid-band-inner {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px; /* Thin black borders between gray cards */
    background-color: #000;
    padding: 4px;
}
.grid-card {
    background-color: #a4a9ad; /* The specific slate gray from screenshot */
    height: 280px;
    position: relative;
    padding: 20px;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: opacity 0.3s;
    overflow: hidden;
}
.grid-card:hover { opacity: 0.85; }
.grid-card-title {
    font-size: 15px;
    color: #111;
    font-weight: 400;
    z-index: 2;
}
.grid-card img {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 200px;
    object-fit: contain;
    object-position: bottom center;
    z-index: 1;
}
/* Color variations for the gray cards to match screenshot */
.grid-card:nth-child(1) { background-color: #b0b8bd; }
.grid-card:nth-child(2) { background-color: #a2adb3; }
.grid-card:nth-child(3) { background-color: #929ea5; }
.grid-card:nth-child(4) { background-color: #849198; }
.grid-card:nth-child(5) { background-color: #79868d; }

/* === Overlapping Highlight Section === */
.highlight-section {
    background-color: var(--bg-dark);
    padding: 120px 0;
}
.highlight-header {
    margin-bottom: 60px;
}
.highlight-header p { color: #aaa; font-size: 13px; margin-bottom: 8px; }
.highlight-header h2 { color: #fff; font-size: 36px; font-weight: 300; }

.overlap-container {
    position: relative;
    height: 600px;
    width: 100%;
}
.overlap-image {
    position: absolute;
    right: 0;
    top: 0;
    width: 80%;
    height: 100%;
    background: url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') center/cover no-repeat;
}
.overlap-card-white {
    position: absolute;
    left: 10%;
    top: 50%;
    transform: translateY(-50%);
    background: #fff;
    padding: 50px;
    width: 420px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    z-index: 10;
}
.overlap-card-white p.tag { font-size: 13px; color: #555; margin-bottom: 16px; }
.overlap-card-white h3 { font-size: 32px; color: #111; margin-bottom: 20px; font-weight: 300; }
.overlap-card-white p.desc { font-size: 15px; color: #444; margin-bottom: 30px; line-height: 1.6; }
.links-col { display: flex; flex-direction: column; gap: 4px; }

/* === Video/Trust Banner === */
.video-banner {
    position: relative;
    height: 500px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}
.video-banner-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 0;
}
.video-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    background: rgba(14, 22, 30, 0.55);
    pointer-events: none;
}
.video-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}
.video-content p.eyebrow { font-size: 13px; color: #ccc; margin-bottom: 12px; }
.video-content h2 { font-size: 42px; font-weight: 100; margin-bottom: 20px; letter-spacing: 2px; }
.video-content p.desc { font-size: 14px; color: #aaa; margin-bottom: 40px; line-height: 1.6; }
.video-links { margin-top: 40px; display: flex; justify-content: center; gap: 40px; }
.video-links a { color: #fff; font-size: 14px; border-bottom: 1px solid #fff; padding-bottom: 4px; }

/* === Icon Grid (Support/Features) === */
.support-section {
    background-color: var(--bg-dark);
    padding: 80px 0 100px;
}
.support-header { margin-bottom: 40px; }
.support-header h2 { color: #fff; font-size: 32px; font-weight: 300; margin-bottom: 12px; }
.support-header p { color: #aaa; font-size: 14px; }

.icon-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}
.icon-box {
    background-color: #1a2530; /* Lighter navy */
    padding: 50px 20px;
    text-align: center;
    transition: background 0.3s;
    cursor: pointer;
}
.icon-box:hover { background-color: #243444; }
.icon-box i {
    display: block;
    margin: 0 auto 20px;
    font-size: 36px;
    line-height: 1;
    color: var(--brand-blue-light);
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-style: normal;
}
.icon-box h4 { color: #fff; font-size: 14px; font-weight: 400; }

/* === Dark Overlap (GitHub/Community) === */
.dark-overlap-section {
    background-color: var(--bg-dark);
    padding-bottom: 120px;
}
.dark-overlap-container {
    position: relative;
    display: flex;
    align-items: center;
    height: 500px;
}
.dark-overlap-img {
    width: 60%;
    height: 100%;
    background: url('https://images.unsplash.com/photo-1618401471353-b98afee0b2eb?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
}
.dark-card {
    background-color: #121a24;
    width: 480px;
    padding: 60px 50px;
    position: absolute;
    right: 5%;
    color: #fff;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}
.dark-card h3 { font-size: 32px; font-weight: 300; text-align: center; margin-bottom: 20px; }
.dark-card p { font-size: 14px; color: #aaa; text-align: center; margin-bottom: 40px; line-height: 1.6; }
.dark-card-actions { display: flex; justify-content: center; gap: 30px; align-items: center; margin-bottom: 50px; }
.dark-card-actions a.plain-link { font-size: 14px; color: #fff; }
.btn-outline-white { border: 1px solid #fff; background: transparent; color: #fff; padding: 12px 24px; font-size: 14px; cursor: pointer; transition: all 0.3s; }
.btn-outline-white:hover { background: #fff; color: #000; }

.dark-icons { display: flex; justify-content: space-between; border-top: 1px solid #2a3543; padding-top: 30px; }
.di-item { text-align: center; }
.di-item i { font-size: 28px; color: #fff; margin-bottom: 12px; }
.di-item span { display: block; font-size: 12px; color: #aaa; }


/* === Footer === */
.site-footer {
    background-color: #f5f6f8;
    padding: 60px 0 30px;
    color: #444;
    font-size: 12px;
}
.footer-top {
    display: flex;
    gap: 40px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 30px;
    margin-bottom: 40px;
}
.footer-top-item { display: flex; align-items: center; gap: 8px; font-size: 13px; cursor: pointer; }
.footer-top .lang-switcher { z-index: 10; }

.footer-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 60px;
}
.footer-col h5 { font-size: 14px; font-weight: 500; color: #111; margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { color: #666; }
.footer-col ul li a:hover { color: var(--brand-blue); }

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
    padding-top: 20px;
}
.footer-bottom a { color: #666; }
.footer-bottom a:hover { color: var(--brand-blue); }
.copyright-text { margin-right: auto; color: #888; }

/* === Mobile Menu Button (hamburger) === */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    padding: 6px;
    cursor: pointer;
    flex-shrink: 0;
}
.mobile-menu-bar {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--brand-blue);
    border-radius: 1px;
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform-origin: center;
}
.mobile-menu-btn.is-open .mobile-menu-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.mobile-menu-btn.is-open .mobile-menu-bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.mobile-menu-btn.is-open .mobile-menu-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* === Mobile Menu Panel === */
.mobile-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: #fff;
    z-index: 901;
    overflow-y: auto;
    border-top: 1px solid #e5e5e5;
    flex-direction: column;
}
/* hidden 属性会被 display:flex 覆盖，需显式处理 */
.mobile-menu[hidden] { display: none !important; }
.mobile-menu:not([hidden]) { display: flex; }
body.mobile-menu-open { overflow: hidden; }

/* === Mobile Menu Header (title + close button) === */
.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #e5e5e5;
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 1;
}
.mobile-menu-title {
    font-size: 13px;
    color: var(--text-light-gray);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    flex: 1;
}
.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 24px;
    font-size: 15px;
    color: var(--text-dark);
    border-bottom: 1px solid #f0f0f0;
    font-weight: 400;
    transition: background 0.15s ease, color 0.15s ease;
}
.mobile-nav-link i {
    width: 18px;
    text-align: center;
    color: var(--text-light-gray);
    font-size: 14px;
}
.mobile-nav-link:hover {
    background: #f5f8fc;
    color: var(--brand-blue);
}
.mobile-nav-link:hover i { color: var(--brand-blue); }
.mobile-nav-link.is-active {
    color: var(--brand-blue);
    font-weight: 500;
    background: #f0f5fa;
}
.mobile-nav-link.is-active i { color: var(--brand-blue); }
.mobile-nav-github {
    color: var(--brand-blue) !important;
    margin-top: auto;
    border-top: 1px solid #e5e5e5;
}
.mobile-menu-lang {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 16px 24px;
    border-top: 1px solid #f0f0f0;
}
.mobile-menu-github {
    border-top: 1px solid #f0f0f0;
}
.mobile-lang-icon {
    color: var(--text-muted, #999);
    font-size: 14px;
}
.mobile-lang-link {
    flex-shrink: 0;
    display: inline-block;
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-dark);
    background: #f4f4f4;
    border: 1px solid #e5e5e5;
    text-decoration: none;
    white-space: nowrap;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.mobile-lang-link:hover {
    background: var(--brand-blue);
    border-color: var(--brand-blue);
    color: #fff;
}
.mobile-lang-link.is-active {
    background: var(--brand-blue);
    border-color: var(--brand-blue);
    color: #fff;
    cursor: default;
}

/* === Responsive adjustments === */
@media (max-width: 1200px) {
    .hero-title { font-size: 42px; }
    .overlap-card-white, .dark-card { width: 380px; padding: 40px; }
}
@media (max-width: 992px) {
    :root { --header-height: 72px; }
    .top-nav-inner { justify-content: space-between; }
    .search-box-wrap, .user-actions { display: none; }
    .sub-nav { display: none; }
    .sub-nav-inner { display: none; }
    .mobile-menu-btn { display: flex; }
    .hero-layout { flex-direction: column; text-align: center; padding-top: 40px; }
    .hero-text { margin-bottom: 40px; }
    .hero-platforms { justify-content: center; }
    .hero-visual { justify-content: center; }
    .grid-band-inner, .icon-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; padding: 10px; background: #000; }
    .overlap-container, .dark-overlap-container { height: auto; display: flex; flex-direction: column; }
    .overlap-image, .dark-overlap-img { position: relative; width: 100%; height: 400px; right: auto; left: auto; }
    .overlap-card-white { position: relative; width: 90%; left: auto; transform: none; margin: -50px auto 0; }
    .dark-card { position: relative; width: 90%; right: auto; margin: -50px auto 0; }
    .footer-nav { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .grid-band-inner, .icon-grid { grid-template-columns: 1fr; }
    .footer-nav { grid-template-columns: 1fr; }
    .video-banner { height: auto; min-height: 400px; padding: 60px 0; }
    .video-content h2 { font-size: 28px; }
    .video-content p.desc { font-size: 13px; }
    .video-links { flex-direction: column; align-items: center; gap: 20px; }
    .container { padding: 0 16px; }
    .hero { padding: 60px 0 50px; }
    .hero-title { font-size: 32px; }
    .hero-desc { font-size: 14px; }
    .hero-platforms { gap: 8px; }
    .hero-platform-tab { padding: 7px 14px; font-size: 13px; }
    .overlap-card-white h3 { font-size: 24px; }
    .dark-card h3 { font-size: 24px; }
    .dark-card { padding: 40px 28px; }
    .overlap-card-white { padding: 32px 24px; }
}

/* ============================================================
   NEW SECTIONS
   ============================================================ */

/* === Protocol Support Marquee === */
.proto-band {
    background: #fff;
    border-top: 1px solid #e0e0e0;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    align-items: stretch;
    height: 52px;
    overflow: hidden;
}
.proto-band-label {
    flex-shrink: 0;
    background: #000;
    color: #fff;
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 0 28px;
    display: flex;
    align-items: center;
    white-space: nowrap;
}
.proto-scroll-wrapper {
    overflow: hidden;
    flex: 1;
    display: flex;
    align-items: center;
}
.proto-scroll-track {
    display: flex;
    align-items: center;
    gap: 20px;
    white-space: nowrap;
    animation: proto-scroll 28s linear infinite;
    font-size: 13px;
    color: #555;
    padding: 0 32px;
    font-weight: 300;
}
.proto-scroll-track span { letter-spacing: 0.3px; }
.proto-scroll-track .proto-sep { color: #ccc; font-weight: 100; }
.proto-band:hover .proto-scroll-track { animation-play-state: paused; }
@keyframes proto-scroll {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* === Trust Stats Section === */
.stats-section {
    background: #fff;
    padding: 90px 0 100px;
    border-top: 1px solid #ebebeb;
}
.stats-eyebrow {
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--brand-blue);
    text-transform: uppercase;
    margin-bottom: 56px;
}
.stats-row {
    display: flex;
    align-items: flex-start;
}
.stat-item {
    flex: 1;
    padding: 0 48px;
}
.stat-item:first-child { padding-left: 0; }
.stat-item:last-child  { padding-right: 0; }
.stat-figure {
    display: flex;
    align-items: flex-start;
    line-height: 1;
    margin-bottom: 18px;
}
.stat-num {
    font-size: 80px;
    font-weight: 100;
    color: #000;
    letter-spacing: -4px;
    line-height: 0.9;
}
.stat-unit {
    font-size: 22px;
    font-weight: 300;
    color: #000;
    margin-top: 10px;
    margin-left: 4px;
}
.stat-label {
    font-size: 15px;
    font-weight: 500;
    color: #111;
    margin-bottom: 8px;
}
.stat-sub {
    font-size: 13px;
    color: #888;
    line-height: 1.6;
}
.stat-divider {
    flex-shrink: 0;
    width: 1px;
    height: 110px;
    background: #e0e0e0;
    align-self: center;
}

/* === Interactive Feature Explorer === */
.feature-explorer {
    background: #f5f6f8;
    padding: 100px 0;
}
.fe-header { margin-bottom: 56px; }
.fe-eyebrow {
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--brand-blue);
    text-transform: uppercase;
    margin-bottom: 14px;
}
.fe-header h2 {
    font-size: 38px;
    font-weight: 100;
    color: #000;
}
.fe-body {
    display: flex;
    height: 500px;
}
.fe-list {
    flex: 0 0 360px;
    display: flex;
    flex-direction: column;
    border-top: 1px solid #d8d8d8;
}
.fe-item {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 20px 22px;
    border-bottom: 1px solid #d8d8d8;
    cursor: pointer;
    background: #fff;
    transition: background 0.2s ease, color 0.2s ease;
    user-select: none;
}
.fe-item.active,
.fe-item:hover { background: #000; }
.fe-item.active .fe-num,
.fe-item:hover .fe-num { color: #555; }
.fe-item.active .fe-item-text h4,
.fe-item:hover .fe-item-text h4 { color: #fff; }
.fe-item.active .fe-item-text p,
.fe-item:hover .fe-item-text p { color: #888; }
.fe-item.active i,
.fe-item:hover i { color: #fff; opacity: 1; }
.fe-num {
    font-size: 11px;
    color: #bbb;
    font-weight: 300;
    flex-shrink: 0;
    letter-spacing: 1px;
}
.fe-item-text { flex: 1; }
.fe-item-text h4 { font-size: 14px; font-weight: 400; color: #111; margin-bottom: 4px; }
.fe-item-text p  { font-size: 12px; color: #999; line-height: 1.4; }
.fe-item i { font-size: 11px; color: #d0d0d0; opacity: 0.6; flex-shrink: 0; }
.fe-panels { flex: 1; position: relative; overflow: hidden; }
.fe-panel {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}
.fe-panel.active { opacity: 1; pointer-events: auto; }
.fe-panel-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: brightness(0.3);
    transition: filter 0.4s ease;
}
.fe-panel.active .fe-panel-bg { filter: brightness(0.32); }
.fe-panel-content {
    position: relative;
    z-index: 2;
    padding: 52px 60px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}
.fe-panel-content h3 { font-size: 30px; font-weight: 100; color: #fff; margin-bottom: 18px; }
.fe-panel-content p  { font-size: 14px; color: #bbb; line-height: 1.75; max-width: 520px; }
.fe-panel-sub { margin-top: 12px !important; font-size: 12px !important; color: #666 !important; }
.fe-panel-link {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: 8px;
    color: var(--brand-blue-light);
    font-size: 13px;
    margin-top: 28px;
    border-bottom: 1px solid transparent;
    padding-bottom: 2px;
    transition: border-color 0.2s;
}
.fe-panel-link:hover { border-color: var(--brand-blue-light); }
.fe-panel-link i { transition: transform 0.3s; }
.fe-panel-link:hover i { transform: translateX(4px); }

/* === Quick Start Steps === */
.quickstart-section {
    background: #fff;
    padding: 100px 0;
}
.qs-header { margin-bottom: 72px; }
.qs-eyebrow {
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--brand-blue);
    text-transform: uppercase;
    margin-bottom: 14px;
}
.qs-header h2 { font-size: 38px; font-weight: 100; color: #000; margin-bottom: 16px; }
.qs-sub { font-size: 15px; color: #666; max-width: 580px; line-height: 1.65; }
.qs-steps {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 60px;
}
.qs-step { flex: 1; min-width: 0; }
.qs-step-num {
    font-size: 52px;
    font-weight: 100;
    color: #ececec;
    line-height: 1;
    margin-bottom: 14px;
    letter-spacing: -2px;
}
.qs-step-icon {
    width: 48px;
    height: 48px;
    border: 1px solid #d8d8d8;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 22px;
}
.qs-step-icon i { font-size: 18px; color: var(--brand-blue); }
.qs-step h4 { font-size: 16px; font-weight: 400; color: #111; margin-bottom: 12px; line-height: 1.4; }
.qs-step p  { font-size: 14px; color: #666; line-height: 1.7; }
/* 与图标垂直居中：序号区(52+14) + 图标高度一半(24) = 90px */
.qs-connector {
    flex: 0 0 56px;
    align-self: flex-start;
    margin-top: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}
.qs-connector span { flex: 1; height: 1px; background: #ddd; }
.qs-connector i { font-size: 9px; color: #bbb; }
.qs-cta { display: flex; align-items: center; gap: 40px; }
.qs-doc-link {
    color: var(--brand-blue);
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.qs-doc-link i { transition: transform 0.3s; }
.qs-doc-link:hover i { transform: translateX(4px); }

/* === FAQ Section === */
.faq-section {
    background: #0a0f14;
    padding: 100px 0;
}
.faq-header { margin-bottom: 60px; }
.faq-eyebrow {
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--brand-blue-light);
    text-transform: uppercase;
    margin-bottom: 14px;
}
.faq-header h2 {
    font-size: 36px;
    font-weight: 100;
    color: #fff;
    max-width: 600px;
    line-height: 1.3;
}
.faq-list { max-width: 840px; }
.faq-item { border-bottom: 1px solid #182232; }
.faq-item:first-child { border-top: 1px solid #182232; }
.faq-q {
    width: 100%;
    background: none;
    border: none;
    color: #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 26px 0;
    font-size: 15px;
    font-weight: 300;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
    gap: 24px;
    line-height: 1.5;
    transition: color 0.2s;
}
.faq-q:hover { color: #fff; }
.faq-q span { flex: 1; }
.faq-q i {
    font-size: 13px;
    color: var(--brand-blue-light);
    transition: transform 0.35s ease;
    flex-shrink: 0;
}
.faq-q[aria-expanded="true"] i { transform: rotate(45deg); }
.faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding-bottom 0.3s ease;
}
.faq-a.open {
    max-height: 400px;
    padding-bottom: 28px;
}
.faq-a p { font-size: 14px; color: #7a92a8; line-height: 1.85; }

/* === Blog Preview Section === */
.blog-preview-section {
    background: #fff;
    padding: 100px 0;
    border-top: 1px solid #ebebeb;
}
.bp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 48px;
}
.bp-eyebrow {
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--brand-blue);
    text-transform: uppercase;
    margin-bottom: 12px;
}
.bp-header h2 { font-size: 38px; font-weight: 100; color: #000; }
.bp-all-link {
    color: var(--brand-blue);
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    margin-bottom: 8px;
}
.bp-all-link i { transition: transform 0.3s; }
.bp-all-link:hover i { transform: translateX(4px); }
.bp-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2px;
    background: #e5e5e5;
}
.bp-main {
    display: flex;
    flex-direction: column;
    background: #fff;
    overflow: hidden;
}
.bp-main-img {
    height: 340px;
    background-size: cover;
    background-position: center;
    transition: transform 0.5s ease;
}
.bp-main:hover .bp-main-img { transform: scale(1.03); }
.bp-main-content { padding: 36px 40px; flex: 1; }
.bp-tag {
    display: inline-block;
    font-size: 10px;
    letter-spacing: 1.5px;
    color: var(--brand-blue);
    text-transform: uppercase;
    margin-bottom: 12px;
}
.bp-main-content h3 {
    font-size: 22px;
    font-weight: 300;
    color: #111;
    margin-bottom: 12px;
    line-height: 1.45;
}
.bp-main-content p { font-size: 14px; color: #666; line-height: 1.6; }
.bp-side {
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: #e5e5e5;
}
.bp-small {
    flex: 1;
    background: #fff;
    display: flex;
    overflow: hidden;
    transition: background 0.2s;
}
.bp-small:hover { background: #fafafa; }
.bp-small-img {
    flex: 0 0 130px;
    background-size: cover;
    background-position: center;
    transition: transform 0.5s ease;
}
.bp-small:hover .bp-small-img { transform: scale(1.06); }
.bp-small-content {
    padding: 24px 26px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.bp-small-content h4 {
    font-size: 14px;
    font-weight: 400;
    color: #111;
    margin-bottom: 8px;
    line-height: 1.45;
}
.bp-small-content p { font-size: 12px; color: #888; line-height: 1.55; }

/* ============================================================
   RESPONSIVE — NEW SECTIONS
   ============================================================ */
@media (max-width: 1100px) {
    .stats-row { flex-wrap: wrap; gap: 50px 0; }
    .stat-item { flex: 0 0 50%; padding: 0 40px; }
    .stat-item:nth-child(odd) { padding-left: 0; }
    .stat-divider { display: none; }
    .fe-body { height: auto; flex-direction: column; }
    .fe-list { flex: none; flex-direction: row; flex-wrap: wrap; border: none; }
    .fe-item { flex: 0 0 50%; border: 1px solid #d8d8d8; margin: -1px 0 0 -1px; }
    .fe-panels { height: 360px; }
    .bp-grid { grid-template-columns: 1fr; }
    .bp-side { flex-direction: row; }
    .bp-small { flex-direction: column; }
    .bp-small-img { flex: 0 0 180px; }
}
@media (max-width: 768px) {
    .proto-band { height: 44px; }
    .proto-band-label { padding: 0 18px; font-size: 10px; }
    .stats-section { padding: 60px 0; }
    .stat-item { flex: 0 0 100%; padding: 0; }
    .stat-num { font-size: 60px; }
    .feature-explorer { padding: 60px 0; }
    .fe-list { flex-direction: column; }
    .fe-item { flex: none; }
    .fe-panels { height: 300px; }
    .fe-panel-content { padding: 32px 28px; }
    .fe-panel-content h3 { font-size: 22px; }
    .fe-panel-content p { font-size: 13px; word-break: break-word; overflow-wrap: break-word; }
    .quickstart-section { padding: 60px 0; }
    .qs-steps { flex-direction: column; gap: 40px; }
    .qs-step { padding-right: 0; }
    .qs-step-num { font-size: 36px; }
    .qs-step h4 { word-break: break-word; overflow-wrap: break-word; }
    .qs-step p { word-break: break-word; overflow-wrap: break-word; }
    .qs-connector { display: none; }
    .qs-cta { flex-direction: column; align-items: flex-start; gap: 20px; }
    .faq-section { padding: 60px 0; }
    .faq-header h2 { font-size: 26px; }
    .faq-q { font-size: 14px; }
    .faq-a p { font-size: 13px; word-break: break-word; overflow-wrap: break-word; }
    .blog-preview-section { padding: 60px 0; }
    .bp-header { flex-direction: column; align-items: flex-start; gap: 16px; }
    .bp-header h2 { font-size: 26px; }
    .bp-grid { grid-template-columns: 1fr; }
    .bp-side { flex-direction: column; }
    .bp-small { flex-direction: row; }
    .bp-main-img { height: 220px; }
    .bp-main-content { padding: 24px 20px; }
    .bp-main-content h3 { font-size: 18px; word-break: break-word; overflow-wrap: break-word; }
    .bp-small-content h4 { font-size: 13px; word-break: break-word; overflow-wrap: break-word; }
    .footer-top { flex-wrap: wrap; gap: 16px; }
    .footer-bottom { gap: 12px; }
}