@charset "UTF-8";
:root {
    --blue: #168cf3;
    --blue-deep: #0875de;
    --blue-dark: #0756ad;
    --cyan: #72dcff;
    --ice: #edf8ff;
    --ice-deep: #dcedfb;
    --navy: #061a3a;
    --navy-soft: #0b2a56;
    --ink: #10203a;
    --text: #42516a;
    --muted: #75849b;
    --line: #d9e7f3;
    --white: #ffffff;
    --container: 1200px;
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 28px;
    --shadow: 0 24px 70px rgba(8, 66, 126, 0.13);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 82px;
}

body {
    margin: 0;
    min-width: 320px;
    color: var(--ink);
    background: var(--white);
    font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;
    line-height: 1.72;
    text-rendering: optimizeLegibility;
}

body.is-locked {
    overflow: hidden;
}

button,
a {
    color: inherit;
    font: inherit;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

button {
    appearance: none;
}

a {
    text-decoration: none;
}

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

ul,
ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

button:focus-visible,
a:focus-visible {
    outline: 3px solid #ffcf39;
    outline-offset: 4px;
}

.container {
    width: min(calc(100% - 48px), var(--container));
    margin-inline: auto;
}

.skip-link {
    position: fixed;
    z-index: 1300;
    top: 12px;
    left: 12px;
    padding: 10px 16px;
    color: var(--white);
    background: var(--navy);
    border-radius: 8px;
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: sticky;
    z-index: 900;
    top: 0;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid rgba(16, 32, 58, 0.1);
    backdrop-filter: blur(15px);
}

.nav-wrap {
    display: flex;
    align-items: center;
    min-height: 72px;
    gap: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    gap: 11px;
    color: var(--blue-deep);
    font-size: 20px;
    font-weight: 900;
    letter-spacing: -0.04em;
}

.brand img {
    width: 46px;
    height: 46px;
    object-fit: contain;
    border-radius: 13px;
    box-shadow: 0 7px 18px rgba(22, 140, 243, 0.2);
}

.main-nav {
    margin-left: auto;
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: 2px;
}

.main-nav a {
    position: relative;
    display: block;
    padding: 24px 11px 22px;
    color: #4d5b70;
    font-size: 13px;
    font-weight: 700;
    white-space: nowrap;
}

.main-nav a::after {
    position: absolute;
    right: 11px;
    bottom: 14px;
    left: 11px;
    height: 3px;
    content: "";
    background: var(--blue);
    border-radius: 999px;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 180ms ease;
}

.main-nav a:hover,
.main-nav a.is-active {
    color: var(--blue-deep);
}

.main-nav a:hover::after,
.main-nav a.is-active::after {
    transform: scaleX(1);
}

.nav-tools {
    display: flex;
    align-items: center;
    gap: 10px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 48px;
    padding: 0 24px;
    color: var(--white);
    background: var(--blue);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    box-shadow: 0 10px 25px rgba(14, 121, 223, 0.23);
    font-weight: 850;
    line-height: 1;
    cursor: pointer;
    transition: transform 170ms ease, background-color 170ms ease, box-shadow 170ms ease;
}

.button:hover {
    background: var(--blue-deep);
    box-shadow: 0 14px 32px rgba(14, 121, 223, 0.32);
    transform: translateY(-2px);
}

.button:active {
    box-shadow: 0 5px 14px rgba(14, 121, 223, 0.2);
    transform: translateY(1px);
}

.button-nav {
    min-height: 42px;
    padding-inline: 17px;
    font-size: 13px;
}

.button-large {
    min-height: 58px;
    padding-inline: 33px;
    font-size: 16px;
}

.button-primary .icon::before {
    filter: brightness(0) invert(1);
}

.button-white {
    color: var(--blue-deep);
    background: var(--white);
    border-color: rgba(255, 255, 255, 0.68);
    box-shadow: 0 16px 34px rgba(1, 39, 93, 0.25);
}

.button-white:hover {
    color: var(--navy);
    background: var(--ice);
}

.menu-button {
    display: none;
    width: 46px;
    height: 46px;
    padding: 0;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 11px;
    cursor: pointer;
}

.icon {
    display: inline-flex;
    width: 20px;
    height: 20px;
    flex: 0 0 20px;
}

.icon::before {
    width: 100%;
    height: 100%;
    content: "";
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.icon-download::before { background-image: url("../icons/download.svg"); }
.icon-menu::before { background-image: url("../icons/menu.svg"); }
.icon-arrow::before { background-image: url("../icons/arrow.svg"); }
.icon-compass::before { background-image: url("../icons/compass.svg"); }
.icon-refresh::before { background-image: url("../icons/refresh.svg"); }
.icon-devices::before { background-image: url("../icons/devices.svg"); }
.icon-star::before { background-image: url("../icons/star.svg"); }
.icon-bookmark::before { background-image: url("../icons/bookmark.svg"); }
.icon-zoom::before { background-image: url("../icons/zoom.svg"); }
.icon-comic::before { background-image: url("../icons/comic.svg"); }
.icon-text::before { background-image: url("../icons/text.svg"); }
.icon-image::before { background-image: url("../icons/image.svg"); }
.icon-play::before { background-image: url("../icons/play.svg"); }
.icon-search::before { background-image: url("../icons/search.svg"); }
.icon-bookshelf::before { background-image: url("../icons/bookshelf.svg"); }
.icon-bell::before { background-image: url("../icons/bell.svg"); }
.icon-reader::before { background-image: url("../icons/reader.svg"); }
.icon-layout::before { background-image: url("../icons/layout.svg"); }
.icon-folder::before { background-image: url("../icons/folder.svg"); }
.icon-shield::before { background-image: url("../icons/shield.svg"); }
.icon-desktop::before { background-image: url("../icons/desktop.svg"); }
.icon-tablet::before { background-image: url("../icons/tablet.svg"); }
.icon-mobile::before { background-image: url("../icons/mobile.svg"); }
.icon-chevron::before { background-image: url("../icons/chevron.svg"); }
.icon-close::before { background-image: url("../icons/close.svg"); }

.hero {
    position: relative;
    overflow: hidden;
    min-height: 730px;
    color: var(--white);
    background:
        radial-gradient(circle at 77% 22%, rgba(114, 220, 255, 0.35), transparent 22%),
        radial-gradient(circle at 10% 85%, rgba(0, 54, 160, 0.42), transparent 31%),
        linear-gradient(125deg, #13a5ff 0%, #0878e6 48%, #064eaa 100%);
}

.hero::after {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 170px;
    content: "";
    background: linear-gradient(to top, rgba(1, 43, 108, 0.3), transparent);
    pointer-events: none;
}

.orbit {
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 50%;
    pointer-events: none;
}

.orbit::before,
.orbit::after {
    position: absolute;
    width: 10px;
    height: 10px;
    content: "";
    background: var(--white);
    border-radius: 50%;
    box-shadow: 0 0 18px 4px rgba(255, 255, 255, 0.72);
}

.orbit-large {
    top: 36px;
    right: -180px;
    width: 820px;
    height: 490px;
    transform: rotate(-18deg);
}

.orbit-large::before { top: 54px; left: 160px; }
.orbit-large::after { right: 110px; bottom: 73px; }

.orbit-small {
    bottom: -210px;
    left: -210px;
    width: 610px;
    height: 410px;
    transform: rotate(24deg);
}

.orbit-small::before { top: 32px; right: 154px; }
.orbit-small::after { right: 88px; bottom: 40px; }

.stars i {
    position: absolute;
    z-index: 1;
    width: 4px;
    height: 4px;
    background: var(--white);
    border-radius: 50%;
    box-shadow: 0 0 12px 3px rgba(255, 255, 255, 0.7);
}

.stars i:nth-child(1) { top: 12%; left: 8%; }
.stars i:nth-child(2) { top: 20%; left: 42%; }
.stars i:nth-child(3) { top: 68%; left: 51%; }
.stars i:nth-child(4) { top: 37%; right: 6%; }
.stars i:nth-child(5) { bottom: 13%; right: 37%; }
.stars i:nth-child(6) { top: 8%; right: 28%; }

.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: minmax(0, 0.88fr) minmax(520px, 1.12fr);
    align-items: center;
    min-height: 730px;
    gap: 58px;
    padding-block: 74px 88px;
}

.hero-copy {
    max-width: 580px;
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 11px;
    margin-bottom: 15px;
    color: var(--blue-deep);
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0.16em;
}

.eyebrow::before {
    width: 34px;
    height: 2px;
    content: "";
    background: currentColor;
}

.eyebrow b {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    color: var(--ink);
    border: 1px solid currentColor;
    border-radius: 50%;
    letter-spacing: 0;
}

.eyebrow-light {
    color: var(--cyan);
}

.eyebrow-light b {
    color: var(--white);
}

.hero h1 {
    margin-bottom: 4px;
    font-size: clamp(50px, 5.8vw, 84px);
    font-weight: 950;
    line-height: 1.06;
    letter-spacing: -0.075em;
}

.hero h2 {
    margin: 12px 0 22px;
    font-size: clamp(27px, 3vw, 42px);
    font-weight: 850;
    line-height: 1.24;
    letter-spacing: -0.045em;
}

.hero-copy > p:not(.eyebrow) {
    max-width: 550px;
    margin-bottom: 30px;
    color: rgba(255, 255, 255, 0.84);
    font-size: 16px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 28px;
}

.ghost-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding-block: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
    font-size: 14px;
    font-weight: 750;
}

.ghost-link .icon {
    width: 17px;
    height: 17px;
    filter: brightness(0) invert(1);
    transition: transform 170ms ease;
}

.ghost-link:hover .icon {
    transform: translateX(4px);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    margin-top: 38px;
    color: rgba(255, 255, 255, 0.78);
    font-size: 12px;
    font-weight: 700;
}

.hero-tags li {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-tags .icon {
    width: 17px;
    height: 17px;
    filter: brightness(0) invert(1);
    opacity: 0.9;
}

.hero-devices {
    position: relative;
    min-height: 570px;
}

.device-glow {
    position: absolute;
    top: 40px;
    left: 50%;
    width: 460px;
    height: 460px;
    background: rgba(119, 224, 255, 0.28);
    border-radius: 50%;
    filter: blur(50px);
    transform: translateX(-50%);
}

.phone {
    position: absolute;
    overflow: hidden;
    background: var(--white);
    border: 8px solid var(--navy);
    border-radius: 42px;
    box-shadow: 0 35px 70px rgba(0, 28, 77, 0.36);
}

.phone img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
}

.phone-notch {
    position: absolute;
    z-index: 2;
    top: 7px;
    left: 50%;
    width: 78px;
    height: 18px;
    background: var(--navy);
    border-radius: 0 0 13px 13px;
    transform: translateX(-50%);
}

.phone-primary {
    z-index: 3;
    top: 8px;
    left: 58px;
    width: 298px;
    height: 562px;
    transform: rotate(-2deg);
}

.phone-secondary {
    z-index: 2;
    right: -5px;
    bottom: 6px;
    width: 274px;
    height: 515px;
    transform: rotate(8deg);
}

.float-card {
    position: absolute;
    z-index: 5;
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 12px 15px;
    color: var(--blue-deep);
    background: rgba(255, 255, 255, 0.94);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 13px;
    box-shadow: 0 13px 30px rgba(0, 42, 101, 0.24);
    font-size: 12px;
    font-weight: 850;
    backdrop-filter: blur(8px);
}

.float-card .icon {
    width: 18px;
    height: 18px;
}

.float-card-top {
    top: 84px;
    right: 18px;
}

.float-card-bottom {
    bottom: 32px;
    left: 8px;
}

.section {
    padding-block: 112px;
}

.section-head {
    display: grid;
    grid-template-columns: minmax(300px, 0.95fr) minmax(360px, 1.05fr);
    align-items: end;
    gap: 70px;
    margin-bottom: 48px;
}

.section-head h2,
.follow-head h2,
.device-panel h2,
.faq-panel h2 {
    margin-bottom: 0;
    font-size: clamp(34px, 4vw, 54px);
    font-weight: 950;
    line-height: 1.1;
    letter-spacing: -0.055em;
}

.section-head > p,
.follow-head > p,
.device-panel > p {
    margin-bottom: 0;
    color: var(--text);
    font-size: 15px;
}

.interface-section {
    background: var(--white);
}

.interface-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.interface-card {
    display: flex;
    flex-direction: column;
    min-width: 0;
    padding: 12px;
    text-align: left;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 35px rgba(12, 81, 148, 0.07);
    cursor: zoom-in;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.interface-card:hover {
    border-color: #8fc8f7;
    box-shadow: 0 20px 48px rgba(7, 91, 172, 0.17);
    transform: translateY(-7px);
}

.card-top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    min-height: 47px;
    padding: 3px 4px 10px;
}

.card-top b {
    color: var(--blue);
    font-size: 29px;
    font-style: italic;
    line-height: 1;
}

.card-top small {
    color: var(--muted);
    font-size: 9px;
    font-weight: 900;
    letter-spacing: 0.14em;
}

.shot-frame {
    display: block;
    overflow: hidden;
    width: 100%;
    aspect-ratio: 4 / 5;
    background: var(--ice);
    border: 1px solid #cfe4f5;
    border-radius: 12px;
}

.shot-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    transition: transform 250ms ease;
}

.interface-card:hover .shot-frame img {
    transform: scale(1.035);
}

.card-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 17px 4px 5px;
}

.card-bottom > span {
    display: grid;
    gap: 2px;
}

.card-bottom strong {
    font-size: 16px;
}

.card-bottom small {
    color: var(--muted);
    font-size: 11px;
}

.card-bottom .icon {
    width: 22px;
    height: 22px;
}

.channels-section {
    background: var(--ice);
}

.channel-tabs {
    display: flex;
    overflow-x: auto;
    gap: 8px;
    margin-bottom: 26px;
    padding: 5px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid #d0e8fa;
    border-radius: 13px;
    scrollbar-width: none;
}

.channel-tabs::-webkit-scrollbar {
    display: none;
}

.channel-tabs button {
    flex: 0 0 auto;
    min-width: 96px;
    min-height: 40px;
    padding: 8px 17px;
    color: #53647d;
    background: transparent;
    border: 0;
    border-radius: 9px;
    font-size: 12px;
    font-weight: 800;
    cursor: pointer;
}

.channel-tabs button:hover,
.channel-tabs button.is-active {
    color: var(--white);
    background: var(--blue);
}

.channel-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(330px, 0.85fr);
    gap: 24px;
}

.channel-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.channel-card {
    position: relative;
    min-height: 235px;
    padding: 27px;
    background: var(--white);
    border: 1px solid #d2e8f8;
    border-radius: var(--radius-md);
    box-shadow: 0 12px 38px rgba(19, 94, 159, 0.08);
    transition: opacity 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.channel-card[hidden] {
    display: none;
}

.channel-card:hover {
    box-shadow: 0 18px 44px rgba(19, 94, 159, 0.15);
    transform: translateY(-4px);
}

.channel-featured {
    color: var(--white);
    background: linear-gradient(140deg, var(--blue), var(--blue-dark));
    border-color: transparent;
}

.channel-card > .icon {
    width: 36px;
    height: 36px;
}

.channel-featured > .icon {
    filter: brightness(0) invert(1);
}

.channel-index {
    position: absolute;
    top: 24px;
    right: 24px;
    color: var(--blue);
    font-size: 11px;
    font-weight: 900;
}

.channel-featured .channel-index {
    color: rgba(255, 255, 255, 0.74);
}

.channel-card h3 {
    margin: 30px 0 8px;
    font-size: 22px;
    line-height: 1.2;
}

.channel-card p {
    margin-bottom: 18px;
    color: var(--text);
    font-size: 13px;
}

.channel-featured p {
    color: rgba(255, 255, 255, 0.8);
}

.channel-card small {
    color: var(--blue-deep);
    font-size: 10px;
    font-weight: 850;
    letter-spacing: 0.06em;
}

.channel-featured small {
    color: var(--cyan);
}

.channel-preview {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    overflow: hidden;
    min-height: 484px;
    padding: 36px 20px 0 32px;
    color: var(--white);
    background:
        radial-gradient(circle at 85% 12%, rgba(114, 220, 255, 0.35), transparent 24%),
        linear-gradient(150deg, var(--navy-soft), var(--navy));
    border-radius: var(--radius-lg);
}

.channel-preview::before {
    position: absolute;
    top: 42px;
    left: -90px;
    width: 280px;
    height: 170px;
    content: "";
    border: 1px solid rgba(114, 220, 255, 0.26);
    border-radius: 50%;
    transform: rotate(-20deg);
}

.preview-copy {
    position: relative;
    z-index: 2;
}

.preview-copy small {
    color: var(--cyan);
    font-size: 9px;
    font-weight: 900;
    letter-spacing: 0.14em;
}

.preview-copy h3 {
    margin: 18px 0 15px;
    font-size: 31px;
    line-height: 1.28;
}

.preview-copy p {
    margin-bottom: 0;
    color: #a9c0db;
    font-size: 12px;
}

.preview-device {
    align-self: end;
    overflow: hidden;
    height: 405px;
    background: var(--white);
    border: 6px solid #020c20;
    border-bottom: 0;
    border-radius: 27px 27px 0 0;
    box-shadow: -20px 0 45px rgba(0, 0, 0, 0.28);
    transform: rotate(3deg) translateY(6px);
}

.preview-device img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
}

.follow-section {
    position: relative;
    overflow: hidden;
    color: var(--white);
    background:
        radial-gradient(circle at 82% 60%, rgba(22, 140, 243, 0.2), transparent 24%),
        linear-gradient(135deg, #061a3a, #07152d 70%);
}

.orbit-follow {
    top: -180px;
    right: -190px;
    width: 720px;
    height: 440px;
    border-color: rgba(114, 220, 255, 0.17);
    transform: rotate(17deg);
}

.follow-head {
    position: relative;
    z-index: 1;
    max-width: 720px;
    margin-bottom: 44px;
}

.follow-head h2 {
    margin-bottom: 15px;
}

.follow-head > p {
    color: #aebed2;
}

.flow-steps {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: 44px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(151, 195, 234, 0.22);
    border-radius: var(--radius-md);
}

.flow-steps li {
    position: relative;
    display: grid;
    justify-items: center;
    min-height: 160px;
    padding: 25px 20px 20px;
    text-align: center;
    border-right: 1px solid rgba(151, 195, 234, 0.18);
}

.flow-steps li:last-child {
    border-right: 0;
}

.flow-steps li:not(:last-child)::after {
    position: absolute;
    z-index: 2;
    top: 49px;
    right: -12px;
    display: grid;
    place-items: center;
    width: 24px;
    height: 24px;
    content: "›";
    color: var(--cyan);
    background: var(--navy);
    border: 1px solid rgba(114, 220, 255, 0.4);
    border-radius: 50%;
}

.flow-steps li > span {
    position: absolute;
    top: 15px;
    left: 16px;
    color: #55718f;
    font-size: 9px;
    font-weight: 900;
}

.flow-steps .icon {
    width: 38px;
    height: 38px;
    margin-bottom: 11px;
    filter: brightness(0) invert(1);
}

.flow-steps strong {
    font-size: 15px;
}

.flow-steps small {
    color: #8fa3ba;
    font-size: 10px;
}

.follow-main {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(250px, 0.65fr) minmax(290px, 0.8fr) minmax(340px, 1fr);
    align-items: center;
    gap: 26px;
}

.detail-phone {
    position: relative;
    overflow: hidden;
    width: 272px;
    height: 510px;
    justify-self: center;
    background: var(--white);
    border: 7px solid #020b1c;
    border-radius: 39px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.34);
}

.detail-phone img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
}

.progress-panel,
.update-panel {
    padding: 26px;
    background: rgba(13, 47, 88, 0.78);
    border: 1px solid rgba(139, 188, 231, 0.19);
    border-radius: var(--radius-md);
    backdrop-filter: blur(8px);
}

.panel-label {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 18px;
    border-bottom: 1px solid rgba(167, 201, 232, 0.18);
}

.panel-label > .icon {
    width: 30px;
    height: 30px;
    filter: brightness(0) invert(1);
}

.panel-label > span {
    display: grid;
}

.panel-label small,
.update-title small {
    color: var(--cyan);
    font-size: 8px;
    font-weight: 900;
    letter-spacing: 0.14em;
}

.panel-label strong {
    font-size: 17px;
}

.progress-book {
    display: grid;
    gap: 7px;
    margin-top: 22px;
    padding: 21px;
    background: rgba(255, 255, 255, 0.07);
    border-radius: 12px;
}

.progress-book > span,
.progress-book > small {
    color: #93a9c1;
    font-size: 10px;
}

.progress-book > strong {
    font-size: 14px;
}

.progress-book > div {
    overflow: hidden;
    height: 6px;
    margin-top: 6px;
    background: #183c67;
    border-radius: 999px;
}

.progress-book > div i {
    display: block;
    width: 66%;
    height: 100%;
    background: linear-gradient(90deg, var(--blue), var(--cyan));
}

.shelf-row {
    margin-top: 19px;
}

.shelf-row > span {
    color: #a8bad0;
    font-size: 11px;
    font-weight: 800;
}

.shelf-row > div {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 10px;
}

.shelf-row > div i {
    display: block;
    height: 72px;
    background:
        linear-gradient(145deg, transparent 45%, rgba(255, 255, 255, 0.2) 46%),
        linear-gradient(160deg, #168cf3, #113867);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 7px;
}

.shelf-row > div i:nth-child(2) { background-color: #6b50da; filter: hue-rotate(45deg); }
.shelf-row > div i:nth-child(3) { background-color: #2d91ad; filter: hue-rotate(-25deg); }
.shelf-row > div i:nth-child(4) { background-color: #3857a9; filter: hue-rotate(82deg); }

.update-title {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    padding-bottom: 17px;
    border-bottom: 1px solid rgba(167, 201, 232, 0.2);
}

.update-title > span {
    display: grid;
}

.update-title h3 {
    margin: 4px 0 0;
    font-size: 25px;
}

.update-title em {
    padding: 5px 8px;
    color: var(--cyan);
    background: rgba(114, 220, 255, 0.1);
    border: 1px solid rgba(114, 220, 255, 0.25);
    border-radius: 6px;
    font-size: 9px;
    font-style: normal;
    font-weight: 800;
    white-space: nowrap;
}

.update-panel li {
    display: grid;
    grid-template-columns: 76px 1fr auto;
    align-items: center;
    gap: 10px;
    padding: 17px 0;
    border-bottom: 1px solid rgba(167, 201, 232, 0.14);
}

.update-panel li:last-child {
    border-bottom: 0;
}

.update-panel li b {
    font-size: 12px;
}

.update-panel li span {
    color: #9fb2c9;
    font-size: 11px;
}

.update-panel li i {
    color: var(--cyan);
    font-size: 9px;
    font-style: normal;
    white-space: nowrap;
}

.versions-section {
    background: var(--white);
}

.version-timeline {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 36px;
}

.version-timeline::before {
    position: absolute;
    top: 39px;
    right: 13%;
    left: 13%;
    height: 1px;
    content: "";
    background: repeating-linear-gradient(to right, #9ecbf1 0 7px, transparent 7px 13px);
}

.version-timeline li {
    position: relative;
    z-index: 1;
    text-align: center;
}

.timeline-dot {
    display: grid;
    place-items: center;
    width: 78px;
    height: 78px;
    margin: 0 auto 23px;
    background: var(--white);
    border: 1px solid #afd4f4;
    border-radius: 50%;
    box-shadow: 0 10px 28px rgba(22, 140, 243, 0.14);
}

.timeline-dot .icon {
    width: 30px;
    height: 30px;
}

.version-timeline small {
    color: var(--blue-deep);
    font-size: 10px;
    font-weight: 900;
}

.version-timeline h3 {
    margin: 6px 0 9px;
    font-size: 19px;
}

.version-timeline p {
    max-width: 320px;
    margin: 0 auto;
    color: var(--text);
    font-size: 13px;
}

.support-section {
    padding-block: 0;
    background: var(--ice);
    border-block: 1px solid #cfe5f5;
}

.support-grid {
    display: grid;
    grid-template-columns: 0.94fr 1.06fr;
}

.device-panel,
.faq-panel {
    padding: 88px 54px 92px;
}

.device-panel {
    border-right: 1px solid #c6dff2;
}

.device-panel h2,
.faq-panel h2 {
    margin-bottom: 15px;
}

.device-types {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    margin: 32px 0;
}

.device-types span {
    display: grid;
    justify-items: center;
    gap: 9px;
    color: var(--text);
    font-size: 11px;
}

.device-types .icon {
    width: 43px;
    height: 43px;
}

.device-result {
    display: grid;
    gap: 3px;
    margin-top: 20px;
    padding: 17px 18px;
    background: var(--white);
    border: 1px solid #cbe2f4;
    border-radius: 11px;
}

.device-result strong {
    font-size: 13px;
}

.device-result span {
    color: var(--muted);
    font-size: 11px;
}

.device-result.is-ready {
    border-color: #74c8ef;
    box-shadow: 0 8px 22px rgba(22, 140, 243, 0.11);
}

.accordion {
    margin-top: 27px;
    border-top: 1px solid #bedbf0;
}

.faq-item {
    border-bottom: 1px solid #bedbf0;
}

.faq-item h3 {
    margin: 0;
}

.faq-item button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    min-height: 66px;
    gap: 18px;
    padding: 12px 0;
    text-align: left;
    background: transparent;
    border: 0;
    cursor: pointer;
}

.faq-item button span {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    font-weight: 850;
}

.faq-item button b {
    color: var(--blue);
    font-size: 10px;
}

.faq-item .icon {
    transition: transform 180ms ease;
}

.faq-item.is-open .icon {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 38px 18px;
}

.faq-answer p {
    margin-bottom: 0;
    color: var(--text);
    font-size: 12px;
}

.reviews-section {
    background: var(--white);
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.review-card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 335px;
    padding: 27px;
    background: var(--white);
    border: 1px solid #cfe3f3;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 35px rgba(14, 84, 147, 0.07);
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.review-card:nth-child(2),
.review-card:nth-child(5) {
    background: var(--ice);
}

.review-card:hover {
    border-color: #8fcaf8;
    box-shadow: 0 17px 42px rgba(14, 84, 147, 0.14);
    transform: translateY(-4px);
}

.quote {
    height: 39px;
    color: var(--blue);
    font-family: Georgia, serif;
    font-size: 58px;
    font-weight: 900;
    line-height: 1;
}

.review-index {
    position: absolute;
    top: 27px;
    right: 27px;
    color: var(--blue);
    font-size: 10px;
    font-weight: 900;
}

.review-card > p {
    flex: 1;
    margin: 13px 0 23px;
    color: #3d5068;
    font-size: 13px;
    line-height: 1.92;
}

.review-card footer {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 17px;
    border-top: 1px solid #d5e6f2;
}

.review-card footer img {
    width: 44px;
    height: 44px;
    object-fit: cover;
    border: 2px solid var(--white);
    border-radius: 50%;
    box-shadow: 0 0 0 2px #9dd1f7;
}

.review-card footer span {
    display: grid;
    gap: 1px;
}

.review-card footer strong {
    font-size: 13px;
}

.review-card footer small {
    color: var(--muted);
    font-size: 10px;
}

.download-section {
    position: relative;
    overflow: hidden;
    color: var(--white);
    background:
        radial-gradient(circle at 83% 50%, rgba(114, 220, 255, 0.32), transparent 24%),
        linear-gradient(115deg, #119efe, #0879e6 58%, #075bb9);
}

.download-orbit {
    position: absolute;
    top: 50%;
    right: -110px;
    width: 620px;
    height: 210px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    transform: translateY(-50%) rotate(-8deg);
}

.download-orbit::before,
.download-orbit::after {
    position: absolute;
    width: 9px;
    height: 9px;
    content: "";
    background: var(--white);
    border-radius: 50%;
    box-shadow: 0 0 16px 4px rgba(255, 255, 255, 0.6);
}

.download-orbit::before { top: 24px; left: 145px; }
.download-orbit::after { right: 130px; bottom: 28px; }

.download-wrap {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto 140px;
    align-items: center;
    min-height: 280px;
    gap: 45px;
    padding-block: 50px;
}

.download-wrap h2 {
    margin-bottom: 9px;
    font-size: clamp(31px, 4vw, 50px);
    font-weight: 950;
    line-height: 1.14;
    letter-spacing: -0.05em;
}

.download-wrap > div:first-child > p:last-child {
    margin-bottom: 0;
    color: rgba(255, 255, 255, 0.82);
}

.download-wrap .button {
    min-width: 182px;
}

.download-mark {
    position: relative;
    width: 130px;
    height: 130px;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-radius: 50%;
}

.download-mark::before,
.download-mark::after,
.download-mark i {
    position: absolute;
    content: "";
    border-radius: 50%;
}

.download-mark::before {
    inset: 22px;
    border: 2px solid rgba(255, 255, 255, 0.65);
}

.download-mark::after {
    top: 50%;
    left: 50%;
    width: 26px;
    height: 26px;
    background: var(--white);
    transform: translate(-50%, -50%);
}

.download-mark i {
    width: 13px;
    height: 13px;
    background: var(--white);
}

.download-mark i:nth-child(1) { top: 2px; left: 57px; }
.download-mark i:nth-child(2) { right: 12px; bottom: 22px; }
.download-mark i:nth-child(3) { left: 12px; bottom: 22px; }

.download-mark b {
    position: absolute;
    top: 50%;
    left: -18px;
    width: 164px;
    height: 1px;
    background: rgba(255, 255, 255, 0.4);
    transform: rotate(-26deg);
}

.site-footer {
    color: #a7b8cd;
    background: var(--navy);
}

.footer-main {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    min-height: 150px;
    gap: 42px;
}

.site-footer .brand {
    color: var(--white);
}

.footer-main nav ul {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px 21px;
}

.footer-main nav a {
    font-size: 11px;
    font-weight: 700;
}

.footer-main nav a:hover {
    color: var(--cyan);
}

.footer-main > p {
    margin-bottom: 0;
    font-size: 11px;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 58px;
    padding-block: 15px;
    border-top: 1px solid rgba(174, 201, 228, 0.16);
    font-size: 10px;
}

.site-tongji {
    min-width: 1px;
    min-height: 1px;
}

.lightbox {
    position: fixed;
    z-index: 1200;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 70px 24px 28px;
    background: rgba(2, 13, 34, 0.94);
    opacity: 0;
    visibility: hidden;
    transition: opacity 180ms ease, visibility 180ms ease;
}

.lightbox.is-open {
    opacity: 1;
    visibility: visible;
}

.lightbox-stage {
    display: flex;
    justify-content: center;
    max-width: min(94vw, 1100px);
    max-height: calc(100vh - 105px);
}

.lightbox-stage img {
    width: auto;
    max-height: calc(100vh - 105px);
    object-fit: contain;
    background: var(--white);
    border: 3px solid var(--white);
    border-radius: 15px;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 24px;
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    padding: 0;
    background: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    cursor: pointer;
}

.js .reveal {
    opacity: 0;
    transform: translateY(25px);
    transition: opacity 520ms ease, transform 520ms ease;
}

.js .reveal[data-delay="1"] { transition-delay: 80ms; }
.js .reveal[data-delay="2"] { transition-delay: 150ms; }
.js .reveal[data-delay="3"] { transition-delay: 220ms; }

.js .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 1120px) {
    .nav-wrap {
        gap: 16px;
    }

    .main-nav a {
        padding-inline: 8px;
        font-size: 12px;
    }

    .main-nav a::after {
        right: 8px;
        left: 8px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 0.9fr) minmax(450px, 1.1fr);
        gap: 28px;
    }

    .phone-primary {
        left: 28px;
        width: 274px;
        height: 525px;
    }

    .phone-secondary {
        width: 250px;
        height: 480px;
    }

    .interface-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .shot-frame {
        aspect-ratio: 5 / 4;
    }

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

    .channel-preview {
        grid-template-columns: 1fr 260px;
        min-height: 420px;
    }

    .preview-device {
        height: 365px;
    }

    .follow-main {
        grid-template-columns: 260px 1fr;
    }

    .update-panel {
        grid-column: 1 / -1;
    }
}

@media (max-width: 991px) {
    html {
        scroll-padding-top: 72px;
    }

    .container {
        width: min(calc(100% - 36px), var(--container));
    }

    .site-header {
        backdrop-filter: none;
    }

    .nav-wrap {
        min-height: 66px;
    }

    .brand img {
        width: 42px;
        height: 42px;
    }

    .main-nav {
        position: absolute;
        top: calc(100% + 1px);
        right: 18px;
        left: 18px;
        display: none;
        margin: 0;
        padding: 12px;
        background: var(--white);
        border: 1px solid var(--line);
        border-radius: 14px;
        box-shadow: var(--shadow);
    }

    .main-nav.is-open {
        display: block;
    }

    .main-nav ul {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 5px;
    }

    .main-nav a {
        padding: 13px 14px;
        border-radius: 9px;
        font-size: 14px;
    }

    .main-nav a::after {
        display: none;
    }

    .main-nav a:hover,
    .main-nav a.is-active {
        background: var(--ice);
    }

    .nav-tools {
        margin-left: auto;
    }

    .menu-button {
        display: grid;
        place-items: center;
    }

    .hero-grid {
        grid-template-columns: 1fr 1fr;
        min-height: 680px;
        padding-block: 62px 76px;
    }

    .hero h1 {
        font-size: clamp(45px, 7vw, 67px);
    }

    .hero-devices {
        min-height: 510px;
    }

    .phone-primary {
        left: 0;
        width: 235px;
        height: 460px;
    }

    .phone-secondary {
        right: -40px;
        width: 220px;
        height: 420px;
    }

    .float-card-top {
        right: -15px;
    }

    .section {
        padding-block: 88px;
    }

    .section-head {
        gap: 36px;
    }

    .channel-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .flow-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .flow-steps li:nth-child(2) {
        border-right: 0;
    }

    .flow-steps li:nth-child(-n+2) {
        border-bottom: 1px solid rgba(151, 195, 234, 0.18);
    }

    .flow-steps li:nth-child(2)::after {
        display: none;
    }

    .version-timeline {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .version-timeline::before {
        top: 40px;
        bottom: 40px;
        left: 38px;
        width: 1px;
        height: auto;
        background: repeating-linear-gradient(to bottom, #9ecbf1 0 7px, transparent 7px 13px);
    }

    .version-timeline li {
        display: grid;
        grid-template-columns: 78px 1fr;
        align-items: center;
        gap: 22px;
        text-align: left;
    }

    .timeline-dot {
        margin: 0;
    }

    .version-timeline p {
        margin-left: 0;
    }

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

    .device-panel,
    .faq-panel {
        padding: 72px 36px;
    }

    .device-panel {
        border-right: 0;
        border-bottom: 1px solid #c6dff2;
    }

    .review-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .download-wrap {
        grid-template-columns: 1fr auto;
    }

    .download-mark {
        display: none;
    }

    .footer-main {
        grid-template-columns: 1fr;
        justify-items: center;
        gap: 25px;
        padding-block: 40px;
        text-align: center;
    }
}

@media (max-width: 767px) {
    .container {
        width: min(calc(100% - 28px), var(--container));
    }

    .brand {
        gap: 8px;
        font-size: 17px;
    }

    .brand img {
        width: 38px;
        height: 38px;
    }

    .nav-tools .button-nav {
        display: none;
    }

    .main-nav ul {
        grid-template-columns: 1fr;
    }

    .hero {
        min-height: auto;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 34px;
        padding-block: 52px 78px;
    }

    .hero-copy {
        max-width: none;
    }

    .hero h1 {
        font-size: clamp(45px, 15vw, 67px);
    }

    .hero h2 {
        font-size: clamp(27px, 8.5vw, 38px);
    }

    .hero-actions {
        align-items: stretch;
        flex-direction: column;
        gap: 17px;
    }

    .hero-actions .button {
        width: 100%;
    }

    .ghost-link {
        align-self: flex-start;
    }

    .hero-tags {
        margin-top: 28px;
    }

    .hero-devices {
        min-height: 500px;
    }

    .phone-primary {
        left: 7%;
        width: 245px;
        height: 465px;
    }

    .phone-secondary {
        right: 1%;
        width: 215px;
        height: 410px;
    }

    .float-card-top {
        right: 0;
    }

    .float-card-bottom {
        left: 0;
    }

    .section {
        padding-block: 72px;
    }

    .section-head {
        grid-template-columns: 1fr;
        gap: 17px;
        margin-bottom: 34px;
    }

    .section-head h2,
    .follow-head h2,
    .device-panel h2,
    .faq-panel h2 {
        font-size: clamp(34px, 11vw, 46px);
    }

    .interface-grid {
        display: flex;
        overflow-x: auto;
        gap: 14px;
        margin-inline: -14px;
        padding: 4px 14px 18px;
        scroll-padding-left: 14px;
        scroll-snap-type: x mandatory;
    }

    .interface-card {
        min-width: min(82vw, 340px);
        scroll-snap-align: start;
    }

    .shot-frame {
        aspect-ratio: 4 / 5;
    }

    .channel-grid {
        display: flex;
        overflow-x: auto;
        gap: 14px;
        margin-inline: -14px;
        padding: 3px 14px 18px;
        scroll-padding-left: 14px;
        scroll-snap-type: x mandatory;
    }

    .channel-card {
        min-width: min(80vw, 325px);
        scroll-snap-align: start;
    }

    .channel-preview {
        grid-template-columns: 1fr 145px;
        min-height: 420px;
        padding: 30px 13px 0 24px;
    }

    .preview-copy h3 {
        font-size: 26px;
    }

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

    .flow-steps li {
        grid-template-columns: 44px 1fr;
        align-items: center;
        justify-items: start;
        min-height: 110px;
        gap: 2px 14px;
        padding: 22px 20px;
        text-align: left;
        border-right: 0;
        border-bottom: 1px solid rgba(151, 195, 234, 0.18);
    }

    .flow-steps li:last-child {
        border-bottom: 0;
    }

    .flow-steps li:not(:last-child)::after {
        top: auto;
        right: auto;
        bottom: -12px;
        left: 31px;
        content: "⌄";
    }

    .flow-steps .icon {
        grid-row: 1 / 3;
        margin: 0;
    }

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

    .detail-phone {
        width: min(76vw, 270px);
    }

    .progress-panel,
    .update-panel {
        width: 100%;
    }

    .update-panel {
        grid-column: auto;
    }

    .version-timeline li {
        grid-template-columns: 60px 1fr;
        gap: 15px;
    }

    .timeline-dot {
        width: 60px;
        height: 60px;
    }

    .version-timeline::before {
        left: 29px;
    }

    .device-panel,
    .faq-panel {
        padding: 64px 18px;
    }

    .review-grid {
        display: flex;
        overflow-x: auto;
        gap: 14px;
        margin-inline: -14px;
        padding: 4px 14px 18px;
        scroll-padding-left: 14px;
        scroll-snap-type: x mandatory;
    }

    .review-card {
        min-width: min(86vw, 360px);
        min-height: 350px;
        scroll-snap-align: start;
    }

    .download-wrap {
        grid-template-columns: 1fr;
        min-height: 340px;
        gap: 26px;
        padding-block: 60px;
    }

    .download-wrap .button {
        width: 100%;
    }

    .footer-main nav ul {
        gap: 12px 18px;
    }

    .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
        gap: 6px;
    }
}

@media (max-width: 479px) {
    .hero-devices {
        min-height: 430px;
    }

    .phone {
        border-width: 6px;
        border-radius: 32px;
    }

    .phone-primary {
        left: 1%;
        width: 208px;
        height: 402px;
    }

    .phone-secondary {
        right: -10%;
        width: 190px;
        height: 365px;
    }

    .float-card {
        padding: 9px 11px;
        font-size: 10px;
    }

    .hero-tags {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .channel-preview {
        grid-template-columns: 1fr;
        min-height: 490px;
    }

    .preview-device {
        position: absolute;
        right: 18px;
        bottom: 0;
        width: 160px;
        height: 310px;
    }

    .preview-copy {
        max-width: 190px;
    }

    .update-panel li {
        grid-template-columns: 1fr auto;
        gap: 3px 10px;
    }

    .update-panel li span {
        grid-column: 1 / -1;
        grid-row: 2;
    }

    .update-panel li i {
        grid-column: 2;
        grid-row: 1;
    }

    .device-types {
        gap: 8px;
    }

    .device-types .icon {
        width: 35px;
        height: 35px;
    }

    .faq-item button span {
        align-items: flex-start;
    }

    .faq-answer {
        padding-left: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}