:root {
    --ink: #eef8ff;
    --muted: #9fb2c2;
    --bg: #050b13;
    --bg-deep: #03070d;
    --panel: #091522;
    --panel-2: #0c1c2a;
    --line: rgba(148, 194, 224, .16);
    --line-strong: rgba(75, 210, 255, .33);
    --cyan: #4bdcff;
    --cyan-soft: #a6efff;
    --blue: #418cff;
    --green: #70f0b0;
    --gold: #ffc85b;
    --shell: min(1240px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; color: var(--ink); background: var(--bg); font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; font-size: 16px; text-rendering: optimizeLegibility; }
.video-center-page { overflow-x: hidden; }
body.modal-open { overflow: hidden; }
a { color: inherit; }
button, input { font: inherit; }
button { cursor: pointer; }
img { max-width: 100%; }
.page-shell { width: var(--shell); margin: 0 auto; }
.is-hidden { display: none !important; }

/* header */
.center-header { position: sticky; top: 0; z-index: 70; border-bottom: 1px solid rgba(255, 255, 255, .08); background: rgba(7, 17, 31, .5); backdrop-filter: blur(18px); }
.center-nav { width: min(1320px, calc(100% - 48px)); min-height: 72px; display: flex; align-items: center; gap: 32px; }
.center-brand { display: flex; flex: none; align-items: center; gap: 10px; text-decoration: none; }
.center-brand img { width: 154px; height: auto; display: block; object-fit: contain; filter: none; }
.center-links { margin-left: auto; display: flex; align-items: center; gap: 30px; }
.center-links a { position: relative; padding: 26px 0 24px; color: rgba(255, 255, 255, .76); font-size: 14px; font-weight: 600; text-decoration: none; transition: color .18s ease; }
.center-links a::after { content: ""; position: absolute; left: 50%; right: 50%; bottom: 15px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--blue), var(--cyan)); transition: right .18s ease, left .18s ease; }
.center-links a:hover, .center-links a.active { color: #fff; }
.center-links a:hover::after, .center-links a.active::after { right: 0; left: 0; }
.center-menu { display: none; width: 42px; height: 42px; margin-left: auto; padding: 10px; border: 0; border-radius: 10px; background: rgba(255, 255, 255, .08); }
.center-menu span { display: block; width: 100%; height: 2px; margin: 5px 0; border-radius: 2px; background: #fff; }
.center-mobile { display: none; position: fixed; z-index: 69; inset: 73px 0 auto; padding: 10px 24px 20px; border-top: 1px solid rgba(255, 255, 255, .08); border-bottom: 1px solid rgba(255, 255, 255, .08); background: rgba(7, 17, 31, .98); box-shadow: 0 24px 60px rgba(0,0,0,.45); }
.center-mobile.open { display: grid; }
.center-mobile a { padding: 14px 4px; border-bottom: 1px solid rgba(148, 194, 224, .09); color: #c8d6df; text-decoration: none; }

/* shared visual hero */
.visual-hero { position: relative; min-height: 600px; overflow: hidden; border-bottom: 1px solid rgba(145, 196, 227, .12); background: #060d16; }
.visual-hero::after { content: ""; position: absolute; inset: auto 0 0; height: 190px; pointer-events: none; background: linear-gradient(to bottom, transparent, var(--bg)); }
.visual-hero-content { position: relative; z-index: 4; min-height: 600px; display: grid; align-items: center; }
.visual-hero-copy { position: relative; z-index: 5; max-width: 690px; padding: 68px 0 84px; }
.hero-kicker { display: inline-flex; align-items: center; gap: 11px; color: var(--cyan); font: 800 13px/1 Arial, sans-serif; letter-spacing: .18em; }
.hero-kicker::before { content: ""; width: 33px; height: 2px; background: var(--cyan); box-shadow: 0 0 15px rgba(75, 220, 255, .7); }
.visual-hero h1 { margin: 20px 0 20px; font-size: clamp(36px, 3.6vw, 50px); line-height: 1.08; letter-spacing: -.05em; text-wrap: balance; }
.visual-hero h1 em { color: var(--cyan); font-style: normal; text-shadow: 0 0 36px rgba(48, 189, 255, .15); }
.visual-hero-copy > p { max-width: 650px; margin: 0; color: #b3c3ce; font-size: clamp(16px, 1.35vw, 18px); line-height: 1.78; }
.hero-buttons { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 27px; }
.hero-buttons a { min-height: 48px; padding: 0 20px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; border-radius: 10px; text-decoration: none; font-size: 15px; font-weight: 700; }
.primary-hero-button { color: #03101a; background: linear-gradient(135deg, var(--cyan), #7eeaff); box-shadow: 0 15px 45px rgba(44, 190, 255, .18); }
.primary-hero-button:hover { transform: translateY(-2px); box-shadow: 0 18px 50px rgba(44, 190, 255, .28); }
.secondary-hero-button { border: 1px solid rgba(208, 232, 246, .25); color: #e3f2fa; background: rgba(6, 15, 24, .48); backdrop-filter: blur(8px); }
.secondary-hero-button:hover { border-color: rgba(75, 220, 255, .5); color: var(--cyan); }
.hero-scroll { position: absolute; z-index: 6; left: 50%; bottom: 26px; display: flex; align-items: center; gap: 11px; transform: translateX(-50%); color: #708796; font: 700 12px/1 Arial, sans-serif; letter-spacing: .16em; text-decoration: none; }
.hero-scroll span { width: 35px; height: 1px; background: #557383; }

/* video hero */
.visual-hero-image { position: absolute; z-index: 1; inset: 0; background: radial-gradient(circle at 75% 43%, rgba(45, 156, 221, .23), transparent 27%), radial-gradient(circle at 53% 10%, rgba(75, 220, 255, .08), transparent 23%), linear-gradient(118deg, #040b13 0%, #071827 58%, #050e18 100%); }
.visual-hero-image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(3, 9, 16, .84) 0%, rgba(3, 9, 16, .48) 48%, rgba(3, 9, 16, .08) 100%), linear-gradient(180deg, rgba(3,8,14,.05), rgba(3,8,14,.56)); }
.visual-hero-grid { position: absolute; z-index: 2; inset: 0; opacity: .18; background-image: linear-gradient(rgba(78, 199, 255, .2) 1px, transparent 1px), linear-gradient(90deg, rgba(78, 199, 255, .2) 1px, transparent 1px); background-size: 72px 72px; mask-image: linear-gradient(90deg, black, transparent 74%); }
.video-visual-hero .visual-hero-content { grid-template-columns: 1.05fr .95fr; gap: 40px; }
.video-visual-hero h1 { font-size: clamp(36px, 3.25vw, 46px); }
.hero-proof-row { display: flex; flex-wrap: wrap; gap: 12px 25px; margin-top: 27px; color: #a7bac7; font-size: 14px; }
.hero-proof-row span { display: flex; align-items: center; gap: 8px; }
.hero-proof-row b { color: var(--cyan); font: 800 13px Arial, sans-serif; }
.video-hero-console { position: relative; min-height: 475px; align-self: center; perspective: 1200px; }
.hero-console-card { position: absolute; overflow: hidden; border: 1px solid rgba(135, 205, 238, .24); border-radius: 13px; background: #08131e; box-shadow: 0 30px 80px rgba(0,0,0,.48); }
.hero-console-card img { width: 100%; height: 100%; display: block; object-fit: cover; object-position: top; }
.hero-console-main { z-index: 3; width: 78%; aspect-ratio: 1.25; left: 8%; top: 44px; transform: rotateY(-4deg) rotateZ(-1deg); }
.hero-console-main img { height: calc(100% - 43px); }
.console-card-top { height: 43px; padding: 0 15px; display: flex; align-items: center; justify-content: space-between; color: #9cb0bd; background: #0b1a27; font-size: 13px; letter-spacing: .08em; }
.console-card-top span { display: flex; align-items: center; gap: 8px; }
.console-card-top i { width: 7px; height: 7px; display: inline-block; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); }
.console-card-top b { color: var(--cyan); font-weight: 600; }
.console-play { position: absolute; left: 50%; top: calc(50% + 19px); width: 62px; height: 62px; display: grid; place-items: center; transform: translate(-50%, -50%); border: 1px solid rgba(255,255,255,.55); border-radius: 50%; color: #03131c; background: rgba(75, 220, 255, .94); box-shadow: 0 15px 42px rgba(0,0,0,.35); }
.hero-console-small { z-index: 2; width: 37%; aspect-ratio: 1.25; }
.console-small-one { right: 0; top: 7px; transform: rotate(4deg); }
.console-small-two { right: 2%; bottom: 9px; transform: rotate(-3deg); }
.console-float-label { position: absolute; z-index: 6; left: 0; bottom: 18px; min-width: 230px; padding: 13px 16px; display: flex; align-items: center; gap: 12px; border: 1px solid rgba(75, 220, 255, .3); border-radius: 11px; background: rgba(6, 16, 25, .88); box-shadow: 0 16px 45px rgba(0,0,0,.35); backdrop-filter: blur(12px); }
.console-float-label > i { width: 39px; height: 39px; display: grid; place-items: center; border-radius: 9px; color: var(--cyan); background: rgba(75, 220, 255, .1); }
.console-float-label small, .console-float-label strong { display: block; }
.console-float-label small { margin-bottom: 4px; color: #668699; font: 700 12px Arial, sans-serif; letter-spacing: .12em; }
.console-float-label strong { font-size: 14px; }

/* download hero */
.download-visual-hero { background: radial-gradient(circle at 72% 40%, rgba(32, 122, 185, .24), transparent 39%), linear-gradient(135deg, #050c15, #081723 58%, #06101b); }
.download-hero-backdrop { position: absolute; z-index: 1; inset: 0; background: radial-gradient(circle at 78% 46%, rgba(57, 160, 223, .22), transparent 27%), linear-gradient(90deg, rgba(4,10,17,.98) 0%, rgba(4,10,17,.89) 42%, rgba(4,10,17,.34) 75%, rgba(4,10,17,.12) 100%), linear-gradient(140deg, #050d16, #0a2132 62%, #06111c); }
.download-visual-hero::before { content: ""; position: absolute; z-index: 2; inset: 0; opacity: .22; background-image: radial-gradient(circle at center, rgba(85, 210, 255, .55) 1px, transparent 1px); background-size: 34px 34px; mask-image: linear-gradient(90deg, black, transparent 70%); }
.download-hero-word { position: absolute; z-index: 2; right: -18px; top: 126px; color: rgba(101, 207, 255, .035); font: 900 clamp(100px, 14vw, 220px)/1 Arial, sans-serif; letter-spacing: -.07em; }
.download-hero-layout { grid-template-columns: 1fr .92fr; gap: clamp(40px, 5vw, 72px); }
.download-hero-copy { max-width: 680px; }
.download-system-stage { position: relative; z-index: 4; min-height: 410px; display: flex; align-items: center; isolation: isolate; }
.download-system-stage::before { position: absolute; z-index: -1; inset: 3% -12% -8% -5%; border: 1px solid rgba(75, 220, 255, .08); border-radius: 50%; background: radial-gradient(circle, rgba(38, 151, 211, .16), transparent 66%); box-shadow: 0 0 110px rgba(35, 150, 219, .1); content: ""; }
.download-system-window { width: 100%; overflow: hidden; border: 1px solid rgba(119, 198, 232, .24); border-radius: 18px; background: linear-gradient(145deg, rgba(10, 28, 42, .96), rgba(5, 15, 24, .92)); box-shadow: 0 34px 90px rgba(0, 0, 0, .42), 0 0 80px rgba(35, 150, 219, .08); transform: rotateY(-3deg) rotateZ(.35deg); backdrop-filter: blur(18px); }
.download-system-head { height: 48px; display: flex; align-items: center; justify-content: space-between; padding: 0 17px; border-bottom: 1px solid rgba(148, 194, 224, .12); color: #91a8b6; font: 700 11px/1 Arial, sans-serif; letter-spacing: .08em; }
.download-system-head span { display: flex; align-items: center; gap: 9px; }
.download-system-head i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 12px rgba(112, 240, 176, .85); }
.download-system-head b { color: var(--green); font-size: 10px; }
.download-system-body { padding: 24px; }
.download-system-title span, .download-system-title strong { display: block; }
.download-system-title span { color: var(--cyan); font: 800 10px/1 Arial, sans-serif; letter-spacing: .16em; }
.download-system-title strong { margin: 7px 0 20px; font-size: 20px; }
.download-system-row { min-height: 62px; display: grid; grid-template-columns: 38px minmax(0, 1fr) auto; align-items: center; gap: 12px; padding: 9px 11px; border: 1px solid rgba(148, 194, 224, .1); border-radius: 10px; background: rgba(255, 255, 255, .018); }
.download-system-row + .download-system-row { margin-top: 8px; }
.download-system-row > i { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 9px; color: var(--cyan); background: rgba(75, 220, 255, .08); }
.download-system-row span, .download-system-row b, .download-system-row small { min-width: 0; display: block; }
.download-system-row b { color: #e9f6fc; font-size: 13px; }
.download-system-row small { margin-top: 4px; overflow: hidden; color: #718a99; font-size: 11px; white-space: nowrap; text-overflow: ellipsis; }
.download-system-row em { padding: 5px 7px; border-radius: 6px; color: var(--green); background: rgba(112, 240, 176, .08); font: 800 9px/1 Arial, sans-serif; font-style: normal; }
.download-system-progress { margin-top: 18px; }
.download-system-progress > span { height: 4px; display: block; overflow: hidden; border-radius: 4px; background: rgba(255, 255, 255, .07); }
.download-system-progress b { width: 82%; height: 100%; display: block; border-radius: inherit; background: linear-gradient(90deg, var(--blue), var(--cyan)); box-shadow: 0 0 12px rgba(75, 220, 255, .42); }
.download-system-progress small { display: block; margin-top: 8px; color: #617987; font: 700 9px/1 Arial, sans-serif; letter-spacing: .13em; text-align: right; }
.download-system-tag { position: absolute; right: -16px; bottom: -13px; padding: 10px 13px; border: 1px solid rgba(75, 220, 255, .22); border-radius: 9px; color: #8199a7; background: rgba(5, 17, 27, .94); box-shadow: 0 14px 34px rgba(0, 0, 0, .3); font: 700 10px/1 Arial, sans-serif; letter-spacing: .12em; }
.download-system-tag b { margin-right: 7px; color: var(--cyan); font-size: 15px; }
.download-hero-status { display: grid; gap: 10px; margin-top: 28px; color: #9fb4c1; font-size: 14px; }
.download-hero-status span { display: flex; align-items: center; gap: 9px; }
.download-hero-status i { width: 20px; color: var(--cyan); }
.download-hero-status b { color: #e5f3fa; }
.download-compact-hero, .download-compact-hero .visual-hero-content { min-height: 520px; }
.download-compact-hero .visual-hero-copy { max-width: 760px; padding: 62px 0 76px; }
.download-compact-hero .download-hero-backdrop { background-position: center; }

/* video value */
.video-value-band { position: relative; z-index: 8; border-bottom: 1px solid var(--line); background: #06101a; }
.video-value-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.video-value-grid article { min-height: 112px; padding: 23px 28px; display: flex; align-items: center; gap: 18px; border-right: 1px solid var(--line); }
.video-value-grid article:first-child { border-left: 1px solid var(--line); }
.video-value-grid article > span { color: rgba(75, 220, 255, .48); font: 900 32px/1 Arial, sans-serif; }
.video-value-grid strong { display: block; margin-bottom: 6px; font-size: 17px; }
.video-value-grid p { margin: 0; color: #8299a8; font-size: 14px; line-height: 1.6; }

/* shared content */
.content-main { position: relative; padding: 78px 0 96px; background: radial-gradient(circle at 18% 5%, rgba(33, 126, 182, .1), transparent 28%), var(--bg); }
.content-toolbar { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 29px; }
.content-toolbar p { margin: 0 0 11px; color: var(--cyan); font: 800 13px/1 Arial, sans-serif; letter-spacing: .18em; }
.content-toolbar h2 { margin: 0 0 10px; font-size: clamp(28px, 3vw, 40px); line-height: 1.18; letter-spacing: -.035em; }
.content-toolbar > div > span { color: #849aa8; font-size: 14px; }
.filter-list { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 9px; }
.filter-list button { padding: 10px 16px; border: 1px solid var(--line); border-radius: 999px; color: #a7bac6; background: rgba(255,255,255,.015); transition: .18s ease; }
.filter-list button:hover, .filter-list button.active { color: #03131c; border-color: var(--cyan); background: var(--cyan); }
.notice-bar { display: none; margin-bottom: 24px; padding: 15px 18px; border: 1px solid rgba(75, 220, 255, .24); border-radius: 10px; color: #d1e8f2; background: rgba(75, 220, 255, .055); line-height: 1.7; }
.notice-bar.visible { display: block; }
.content-state { position: relative; min-height: 300px; padding: 40px; display: grid; place-content: center; justify-items: center; gap: 10px; overflow: hidden; border: 1px solid var(--line); border-radius: 20px; text-align: center; background: #08131e; }
.content-state i { z-index: 2; margin-bottom: 8px; color: #618091; font-size: 38px; }
.content-state strong, .content-state span, .content-state button { position: relative; z-index: 2; }
.content-state strong { font-size: 20px; }
.content-state span { max-width: 520px; color: var(--muted); line-height: 1.75; }
.content-state button { margin-top: 12px; padding: 11px 18px; border: 1px solid var(--cyan); border-radius: 8px; color: #04131c; background: var(--cyan); font-weight: 700; }
.video-content-state::before { content: ""; position: absolute; inset: 0; opacity: .18; background: linear-gradient(90deg, #07131e 15%, transparent, #07131e 85%), url('../images2/screenshot10.png') center / cover no-repeat; filter: blur(1px); }
.download-content-state::before { content: "ET"; position: absolute; color: rgba(75, 220, 255, .035); font: 900 220px/1 Arial, sans-serif; }

.tutorial-type-tabs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-bottom: 44px; padding: 7px; border: 1px solid var(--line); border-radius: 19px; background: rgba(5, 16, 26, .72); }
.tutorial-type-tabs button { min-width: 0; min-height: 96px; padding: 18px 20px; display: grid; grid-template-columns: 46px minmax(0, 1fr) auto; align-items: center; gap: 15px; border: 1px solid transparent; border-radius: 14px; color: #8fa6b4; background: transparent; text-align: left; transition: .2s ease; }
.tutorial-type-tabs button:hover { color: #dff6ff; background: rgba(75, 220, 255, .035); }
.tutorial-type-tabs button.active { color: #effbff; border-color: rgba(75, 220, 255, .3); background: linear-gradient(120deg, rgba(31, 126, 179, .22), rgba(13, 40, 58, .72)); box-shadow: inset 0 1px rgba(255, 255, 255, .035); }
.tutorial-type-tabs button > i { width: 46px; height: 46px; display: grid; place-items: center; border: 1px solid rgba(75, 220, 255, .18); border-radius: 13px; color: var(--cyan); background: rgba(75, 220, 255, .07); font-size: 18px; }
.tutorial-type-tabs strong, .tutorial-type-tabs small { display: block; }
.tutorial-type-tabs strong { margin-bottom: 7px; font-size: 18px; }
.tutorial-type-tabs small { color: #718a98; font-size: 13px; line-height: 1.5; }
.tutorial-type-tabs em { min-width: 42px; padding: 7px 10px; border-radius: 999px; color: #06131c; background: var(--cyan); font: 800 13px/1 Arial, sans-serif; text-align: center; font-style: normal; }

/* video cards */
.video-showcase-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.video-card { min-width: 0; overflow: hidden; display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 18px; background: linear-gradient(145deg, #0a1723, #07111b); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.video-card:hover { transform: translateY(-4px); border-color: rgba(75, 220, 255, .38); box-shadow: 0 25px 65px rgba(0,0,0,.22); }
.video-poster { position: relative; width: 100%; aspect-ratio: 16 / 9; display: block; padding: 0; overflow: hidden; border: 0; background: #02060b; }
.video-poster img { width: 100%; height: 100%; display: block; object-fit: cover; object-position: center top; transition: transform .4s ease, filter .3s ease; }
.video-poster::after { content: ""; position: absolute; inset: 30% 0 0; background: linear-gradient(transparent, rgba(1,6,10,.75)); }
.video-card:hover .video-poster img { transform: scale(1.025); filter: brightness(1.05); }
.play-circle { position: absolute; z-index: 3; inset: 50% auto auto 50%; width: 64px; height: 64px; display: grid; place-items: center; transform: translate(-50%, -50%); border: 1px solid rgba(255,255,255,.65); border-radius: 50%; color: #06111a; background: rgba(75, 220, 255, .95); box-shadow: 0 18px 46px rgba(0,0,0,.36); transition: transform .2s ease; }
.video-card:hover .play-circle { transform: translate(-50%, -50%) scale(1.08); }
.video-duration { position: absolute; z-index: 4; right: 13px; bottom: 12px; padding: 6px 9px; border-radius: 5px; color: #fff; background: rgba(2,8,12,.82); font: 800 13px Arial, sans-serif; }
.video-body { flex: 1; padding: 24px 25px 27px; }
.video-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; color: var(--cyan); font-size: 13px; font-weight: 700; }
.video-meta span:last-child { color: #7894a5; font-size: 13px; letter-spacing: .1em; }
.video-meta span:last-child i { margin-right: 3px; font-size: 11px; }
.video-body h3 { margin: 0 0 12px; font-size: 21px; line-height: 1.45; }
.video-body h3 a { color: inherit; text-decoration: none; }
.video-body h3 a:hover { color: var(--cyan); }
.video-body p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tutorial-cover { text-decoration: none; }
.article-type-badge { position: absolute; z-index: 4; left: 13px; bottom: 12px; display: inline-flex; align-items: center; gap: 7px; padding: 7px 10px; border: 1px solid rgba(109, 223, 255, .28); border-radius: 6px; color: #dff8ff; background: rgba(3, 13, 21, .84); font-size: 12px; font-weight: 700; }
.article-card-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 18px; padding-top: 15px; border-top: 1px solid var(--line); color: #6f8795; font-size: 12px; }

/* video story */
.visual-story-section { overflow: hidden; border-block: 1px solid var(--line); background: radial-gradient(circle at 20% 55%, rgba(55, 158, 222, .14), transparent 36%), #07111b; }
.visual-story-layout { min-height: 480px; display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); align-items: center; gap: clamp(50px, 7vw, 90px); }
.visual-story-board { position: relative; overflow: hidden; padding: 18px; border: 1px solid rgba(110, 194, 229, .2); border-radius: 18px; background: linear-gradient(145deg, rgba(11, 30, 45, .92), rgba(5, 15, 24, .88)); box-shadow: 0 28px 70px rgba(0, 0, 0, .32); }
.visual-story-board::after { position: absolute; right: -24px; bottom: -35px; content: "ET"; color: rgba(75, 220, 255, .035); font: 900 130px/1 Arial, sans-serif; }
.story-board-head { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; padding: 0 2px 15px; color: #7993a3; font: 700 10px/1 Arial, sans-serif; letter-spacing: .12em; }
.story-board-head span { display: flex; align-items: center; gap: 8px; }
.story-board-head i { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 11px rgba(75, 220, 255, .72); }
.story-board-head b { color: var(--cyan); font-size: 9px; }
.story-board-grid { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.story-board-grid span { min-height: 66px; display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; align-items: center; gap: 10px; padding: 10px; border: 1px solid rgba(137, 194, 222, .1); border-radius: 10px; background: rgba(255, 255, 255, .018); }
.story-board-grid i { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 8px; color: var(--cyan); background: rgba(75, 220, 255, .075); }
.story-board-grid b { font-size: 12px; }
.story-board-grid small { color: rgba(75, 220, 255, .38); font: 800 10px/1 Arial, sans-serif; }
.story-board-flow { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-top: 15px; }
.story-board-flow i { height: 3px; border-radius: 3px; background: rgba(75, 220, 255, .11); }
.story-board-flow i:first-child, .story-board-flow i:nth-child(2), .story-board-flow i:nth-child(3) { background: linear-gradient(90deg, var(--blue), var(--cyan)); box-shadow: 0 0 9px rgba(75, 220, 255, .22); }
.visual-story-copy { position: relative; z-index: 2; padding: 60px 0; }
.visual-story-copy > span { color: var(--cyan); font: 800 13px Arial, sans-serif; letter-spacing: .18em; }
.visual-story-copy h2 { margin: 14px 0 18px; font-size: clamp(30px, 3vw, 40px); line-height: 1.22; letter-spacing: -.035em; }
.visual-story-copy p { max-width: 650px; margin: 0; color: #9aafbc; font-size: 16px; line-height: 1.82; }
.visual-story-copy a { display: inline-flex; align-items: center; gap: 10px; margin-top: 27px; color: var(--cyan); font-weight: 700; text-decoration: none; }

/* download software list */
.product-files-section { background: radial-gradient(circle at 85% 8%, rgba(44, 143, 205, .11), transparent 28%), var(--bg); }
.download-list-head, .download-row { display: grid; grid-template-columns: minmax(0, 1fr) 150px 120px 210px; align-items: center; gap: 22px; }
.download-list-head { margin-bottom: 10px; padding: 0 24px; color: #78909e; font-size: 13px; font-weight: 700; }
.download-list { display: grid; gap: 12px; }
.download-row { position: relative; min-width: 0; padding: 23px 24px; overflow: hidden; border: 1px solid var(--line); border-radius: 15px; background: linear-gradient(105deg, #0b1925, #07121c); transition: transform .2s ease, border-color .2s ease, background .2s ease; }
.download-row::before { content: ""; position: absolute; width: 150px; height: 150px; left: -95px; top: -90px; border-radius: 50%; background: rgba(75, 220, 255, .08); filter: blur(8px); }
.download-row:hover { transform: translateY(-2px); border-color: rgba(75, 220, 255, .38); background: linear-gradient(105deg, #0d1e2c, #081521); }
.download-product-cell { position: relative; z-index: 2; min-width: 0; display: flex; align-items: center; gap: 18px; }
.download-file-icon { width: 54px; height: 54px; flex: none; display: grid; place-items: center; border: 1px solid rgba(75,220,255,.22); border-radius: 13px; color: var(--cyan); background: rgba(75,220,255,.075); font-size: 20px; }
.download-category { display: inline-flex; align-items: center; gap: 8px; color: var(--cyan); font-size: 13px; font-weight: 800; letter-spacing: .07em; }
.download-product-cell h3 { margin: 6px 0 5px; font-size: 21px; line-height: 1.35; }
.download-product-cell p { max-width: 610px; margin: 0; overflow: hidden; color: #8fa5b2; font-size: 14px; line-height: 1.65; text-overflow: ellipsis; white-space: nowrap; }
.download-version { display: inline-flex; margin-top: 8px; padding: 4px 8px; border: 1px solid rgba(148,194,224,.13); border-radius: 6px; color: #9db2be; background: rgba(255,255,255,.018); font-size: 13px; }
.download-data { position: relative; z-index: 2; }
.download-data small { display: none; }
.download-data strong { color: #dce9ef; font-size: 15px; font-weight: 650; }
.download-actions { position: relative; z-index: 2; display: grid; gap: 8px; }
.download-actions a { min-height: 43px; padding: 0 16px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--cyan); border-radius: 8px; color: #03131c; background: var(--cyan); text-decoration: none; font-size: 14px; font-weight: 800; }
.download-actions a:hover { background: #8beaff; }
.download-actions a.secondary { color: #b4c6d0; border-color: var(--line); background: rgba(255,255,255,.02); font-weight: 600; }
.download-actions a.secondary:hover { color: var(--cyan); border-color: rgba(75, 220, 255, .42); }

/* cta and footer */
.center-cta { padding: 0 0 80px; background: var(--bg); }
.cta-panel { min-height: 190px; padding: 36px 40px; display: flex; align-items: center; justify-content: space-between; gap: 35px; overflow: hidden; border: 1px solid rgba(75, 220, 255, .24); border-radius: 20px; background: radial-gradient(circle at 90% 10%, rgba(75, 220, 255, .16), transparent 38%), linear-gradient(120deg, #0d2231, #08141f); }
.cta-panel small { color: var(--cyan); font: 800 13px Arial, sans-serif; letter-spacing: .17em; }
.cta-panel h2 { margin: 10px 0 8px; font-size: clamp(26px, 2.6vw, 34px); letter-spacing: -.03em; }
.cta-panel p { margin: 0; color: #93a9b6; line-height: 1.75; }
.cta-panel > a, .cta-actions a { flex: none; padding: 13px 21px; border-radius: 9px; color: #03131c; background: var(--cyan); text-decoration: none; font-weight: 800; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.cta-actions a.cta-secondary { color: #d3e2ea; border: 1px solid var(--line); background: transparent; }
.center-footer { border-top: 1px solid var(--line); background: var(--bg-deep); }
.center-footer-main { padding: 48px 0 38px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.center-footer img { width: 112px; }
.center-footer p { max-width: 570px; margin: 11px 0 0; color: #6f8794; font-size: 14px; line-height: 1.75; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 13px 25px; }
.footer-links a { color: #94a9b5; font-size: 14px; text-decoration: none; }
.footer-links a:hover { color: var(--cyan); }
.center-footer-bottom { padding: 18px 0; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid rgba(148,194,224,.08); color: #6f8795; font-size: 13px; }

/* video modal */
.video-modal { position: fixed; z-index: 100; inset: 0; display: none; padding: 28px; background: rgba(1, 5, 9, .9); backdrop-filter: blur(14px); }
.video-modal.open { display: grid; place-items: center; }
.video-dialog { width: min(1080px, 100%); max-height: calc(100vh - 56px); overflow: auto; border: 1px solid rgba(75, 220, 255, .25); border-radius: 18px; background: #06101a; box-shadow: 0 35px 110px rgba(0,0,0,.65); }
.video-dialog-head { padding: 18px 22px; display: flex; align-items: center; justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--line); }
.video-dialog-head small { color: var(--cyan); font: 800 13px Arial, sans-serif; letter-spacing: .15em; }
.video-dialog-head h2 { margin: 5px 0 0; font-size: 20px; }
.video-close { width: 39px; height: 39px; border: 1px solid var(--line); border-radius: 50%; color: #d4e1e8; background: transparent; font-size: 21px; }
.video-close:hover { color: var(--cyan); border-color: rgba(75,220,255,.45); }
.video-frame { position: relative; aspect-ratio: 16 / 9; background: #000; }
.video-frame video, .video-frame iframe { width: 100%; height: 100%; display: block; border: 0; }
.video-frame-state { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 11px; padding: 30px; color: #8299a6; text-align: center; }
.video-frame-state i { color: #607b89; font-size: 40px; }
.video-dialog-copy { padding: 22px; }
.video-dialog-copy p { margin: 0; color: #9db1bd; line-height: 1.85; }

@media (min-width: 1500px) {
    .video-center-page { --shell: min(1480px, calc(100% - 64px)); }
}

@media (max-width: 1120px) {
    .center-links { gap: 19px; }
    .video-visual-hero .visual-hero-content { grid-template-columns: 1fr .95fr; }
    .video-hero-console { transform: scale(.88); transform-origin: right center; }
    .download-list-head, .download-row { grid-template-columns: minmax(0, 1fr) 125px 100px 185px; gap: 16px; }
}

@media (max-width: 980px) {
    .center-links { display: none; }
    .center-menu { display: block; }
}

@media (max-width: 900px) {
    .center-links { display: none; }
    .center-menu { display: block; }
    .visual-hero, .visual-hero-content { min-height: 600px; }
    .video-visual-hero .visual-hero-content { grid-template-columns: 1fr; }
    .video-hero-console { position: absolute; right: -12%; bottom: 38px; width: 58%; opacity: .55; transform: scale(.82); }
    .visual-hero-copy { max-width: 660px; }
    .video-showcase-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .visual-story-layout { grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); }
    .download-hero-layout { grid-template-columns: 1.05fr .95fr; gap: 30px; }
    .download-list-head, .download-row { grid-template-columns: minmax(0, 1fr) 115px 90px 155px; gap: 13px; }
    .download-row { padding-inline: 18px; }
    .download-product-cell { gap: 13px; }
    .download-file-icon { width: 48px; height: 48px; }
}

@media (max-width: 760px) {
    :root { --shell: min(100% - 32px, 1240px); }
    .center-nav { width: min(100% - 32px, 1200px); min-height: 64px; }
    .center-brand img { width: 140px; }
    .center-mobile { inset-block-start: 65px; }
    .visual-hero, .visual-hero-content { min-height: 620px; }
    .visual-hero-copy { align-self: start; padding: 62px 0 150px; }
    .visual-hero h1 { margin-top: 17px; font-size: 36px; }
    .visual-hero-copy > p { font-size: 15.5px; line-height: 1.75; }
    .hero-buttons { display: grid; grid-template-columns: 1fr; }
    .hero-buttons a { width: 100%; }
    .hero-proof-row { gap: 10px 18px; font-size: 13px; }
    .hero-scroll { display: none; }
    .visual-hero-image { background-position: 67% center; }
    .video-center-page .visual-hero-image { transform: none; }
    .visual-hero-image::after { background: linear-gradient(90deg, rgba(3,9,16,.97), rgba(3,9,16,.79) 66%, rgba(3,9,16,.45)), linear-gradient(180deg, rgba(3,9,16,.22), rgba(3,9,16,.75)); }
    .video-hero-console { right: 0; bottom: -18px; width: 100%; opacity: .36; transform: scale(.62); transform-origin: center bottom; }
    .console-float-label { display: none; }
    .video-value-grid { grid-template-columns: 1fr; }
    .video-value-grid article, .video-value-grid article:first-child { min-height: 105px; padding: 21px 8px; border-left: 0; border-right: 0; border-bottom: 1px solid var(--line); }
    .download-compact-hero, .download-compact-hero .visual-hero-content { min-height: auto; }
    .download-compact-hero .visual-hero-copy { padding: 56px 0 34px; }
    .download-compact-hero .download-hero-backdrop { background-position: 69% center; }
    .download-hero-word { top: auto; bottom: 95px; font-size: 82px; }
    .download-hero-layout { grid-template-columns: 1fr; }
    .download-hero-copy { position: relative; z-index: 5; max-width: 570px; }
    .download-system-stage { width: min(560px, 100%); min-height: 350px; margin: 0 auto 62px; }
    .content-main { padding: 56px 0 68px; }
    .content-toolbar { align-items: flex-start; flex-direction: column; }
    .filter-list { justify-content: flex-start; }
    .tutorial-type-tabs { grid-template-columns: 1fr; margin-bottom: 34px; }
    .tutorial-type-tabs button { min-height: 86px; }
    .video-showcase-grid { grid-template-columns: 1fr; }
    .visual-story-layout { min-height: auto; grid-template-columns: 1fr; gap: 0; padding-block: 58px; }
    .visual-story-board { width: min(560px, 100%); }
    .visual-story-copy { padding: 60px 0; }
    .download-list-head { display: none; }
    .download-row { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 12px; padding: 22px; }
    .download-product-cell { grid-column: 1 / -1; }
    .download-product-cell p { white-space: normal; }
    .download-data { padding: 12px 14px; border: 1px solid rgba(148,194,224,.12); border-radius: 9px; background: rgba(255,255,255,.018); }
    .download-data small, .download-data strong { display: block; }
    .download-data small { margin-bottom: 6px; color: #78909e; font-size: 13px; }
    .download-actions { grid-column: 1 / -1; grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .cta-panel, .center-footer-main { align-items: flex-start; flex-direction: column; }
    .cta-actions { width: 100%; }
    .cta-actions a { flex: 1; text-align: center; }
    .footer-links { justify-content: flex-start; }
    .center-footer-bottom { flex-direction: column; }
    .video-modal { padding: 12px; }
}

@media (max-width: 460px) {
    .visual-hero-copy { padding-top: 52px; }
    .visual-hero h1 { font-size: 34px; }
    .hero-proof-row { display: grid; }
    .download-compact-hero, .download-compact-hero .visual-hero-content { min-height: auto; }
    .download-compact-hero .visual-hero-copy { padding-top: 52px; }
    .download-hero-status { font-size: 13px; }
    .download-system-stage { min-height: 330px; margin-bottom: 52px; }
    .download-system-window { transform: none; }
    .download-system-body { padding: 18px; }
    .download-system-row small { white-space: normal; }
    .download-system-tag { right: 8px; }
    .story-board-grid { grid-template-columns: 1fr; }
    .video-body { padding: 21px; }
    .content-state { min-height: 310px; padding: 28px 20px; }
    .download-row { padding: 20px 18px; }
    .download-product-cell { align-items: flex-start; }
    .download-file-icon { width: 45px; height: 45px; }
    .download-actions { grid-template-columns: 1fr; }
    .cta-panel { padding: 28px 24px; }
    .cta-actions { display: grid; }
}