/* SmartOSC brand (tasks/create-slides): blue #2F52A0 · light blue #6D9EEB · green #5AB55A / #3E9E3E · ink #2D2D2D
   Be Vietnam Pro (Vietnamese-safe), light weights, 1px hairlines, bright background (blue bottom-left -> white -> green top-right). */
:root {
  --ink: #2D2D2D; --body: #3A3A3A; --soft: #6B7280;
  --blue: #2F52A0; --blue-hi: #6D9EEB; --green: #5AB55A; --green-t: #3E9E3E;
  --amber: #D6811F; --red: #C0392B;
  --hair: #E1E7F0; --line: #C9D3E3; --fill: #F5F8FC; --card: rgba(255, 255, 255, .82);
  --grad: linear-gradient(90deg, #2F52A0, #5AB55A);
  --r: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-snap-type: y proximity; }
body { font-family: 'Be Vietnam Pro', system-ui, sans-serif; font-weight: 300; color: var(--body); line-height: 1.55;
  background: #FBFCFC; overflow-x: hidden; }
button { font-family: inherit; cursor: pointer; }
b, strong { font-weight: 500; color: var(--ink); }

/* ---------- slide = one viewport ---------- */
.slide { position: relative; height: 100vh; min-height: 640px; scroll-snap-align: start; display: flex; align-items: center; overflow: hidden;
  background:
    radial-gradient(60vw 60vh at 0% 100%, rgba(195, 217, 238, .75), transparent 70%),
    radial-gradient(55vw 55vh at 100% 0%, rgba(214, 234, 200, .8), transparent 70%), #FBFCFC; }
.slide:nth-child(odd of .slide) { background:
    radial-gradient(55vw 55vh at 100% 100%, rgba(214, 234, 200, .7), transparent 70%),
    radial-gradient(60vw 60vh at 0% 0%, rgba(195, 217, 238, .7), transparent 70%), #FBFCFC; }
.wrap { width: min(1480px, 88vw); margin: 0 auto; position: relative; z-index: 2; }
.brandbar { position: absolute; top: 2.6vh; left: 6vw; right: 6vw; display: flex; justify-content: space-between; align-items: center; z-index: 3; font-size: 12px; color: var(--soft); letter-spacing: .04em; }
.brandbar img { height: 26px; }
.eyebrow { color: var(--green-t); font-weight: 500; letter-spacing: .14em; text-transform: uppercase; font-size: clamp(11px, 1.4vh, 13px); margin-bottom: 1vh; }
.eyebrow::before { content: ''; display: inline-block; width: 26px; height: 1px; background: var(--green); vertical-align: middle; margin-right: 10px; }
h1 { font-size: clamp(40px, 7vh, 74px); line-height: 1.1; font-weight: 300; letter-spacing: -.02em; color: var(--ink); }
h1 strong { font-weight: 600; }
h2 { font-size: clamp(28px, 4.2vh, 46px); line-height: 1.2; font-weight: 300; color: var(--ink); margin-bottom: 1.6vh; letter-spacing: -.01em; }
h2 strong { font-weight: 500; color: var(--blue); }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 600; }
.hl { color: var(--blue); font-weight: 500; border-bottom: 1px solid var(--green); }
.lead { font-size: clamp(15px, 2vh, 21px); color: var(--soft); margin-top: 1.6vh; max-width: 720px; }
.lead.narrow { max-width: 920px; margin-top: 0; }

/* progress + dots */
.progress { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 50; }
.progress span { display: block; height: 100%; width: 0; background: var(--grad); transition: width .15s; }
.dots { position: fixed; right: 22px; top: 50%; transform: translateY(-50%); z-index: 50; display: flex; flex-direction: column; gap: 14px; }
.dots a { width: 9px; height: 9px; border-radius: 50%; border: 1px solid var(--blue); background: transparent; position: relative; transition: .25s; }
.dots a.on { background: var(--blue); transform: scale(1.3); }
.dots a span { position: absolute; right: 20px; top: 50%; transform: translateY(-50%); white-space: nowrap; font-size: 12px; color: var(--soft); opacity: 0; transition: .2s; pointer-events: none; }
.dots a:hover span { opacity: 1; }

/* ---------- 1. hero ---------- */
#net { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 5vw; align-items: center; }
.meta { display: flex; gap: 12px; margin-top: 3.2vh; flex-wrap: wrap; }
.meta-card { display: flex; gap: 12px; align-items: flex-start; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 1.3vh 18px; backdrop-filter: blur(6px); transition: .25s; }
.meta-card:hover { border-color: var(--blue); transform: translateY(-2px); }
.meta-card svg { width: 24px; height: 24px; flex: none; fill: none; stroke: var(--blue); stroke-width: 1.2; stroke-linecap: round; stroke-linejoin: round; margin-top: 2px; }
.meta-card small { display: block; color: var(--soft); font-size: 11.5px; }
.meta-card b { display: block; font-size: clamp(14px, 1.8vh, 16px); }
.meta-card span { display: block; color: var(--soft); font-size: 12.5px; }
.countdown { margin-top: 2.6vh; display: flex; gap: 10px; align-items: center; color: var(--soft); font-size: 13px; }
.countdown .cd { border: 1px solid var(--line); background: var(--card); border-radius: 10px; padding: 5px 12px; text-align: center; min-width: 62px; }
.countdown .cd b { display: block; font-size: 22px; font-weight: 300; color: var(--blue); }
.countdown .cd small { font-size: 10.5px; }

.pick { color: var(--soft); margin-bottom: 1.2vh; }
.pick i { font-style: normal; color: var(--green-t); }
.roles { display: flex; gap: 10px; margin-bottom: 1.8vh; }
.roles button { flex: 1; padding: 1.2vh 0; border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--blue); font-size: clamp(16px, 2.1vh, 21px); font-weight: 400; letter-spacing: .06em; transition: .2s; }
.roles button:hover { border-color: var(--blue); }
.roles button.on { background: var(--blue); color: #fff; border-color: var(--blue); box-shadow: 0 8px 22px rgba(47, 82, 160, .2); }
.role-card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 2.6vh 28px; backdrop-filter: blur(8px); min-height: 40vh; }
.role-card h3 { font-size: clamp(18px, 2.3vh, 23px); font-weight: 400; color: var(--ink); }
.role-card h3 strong { color: var(--blue); font-weight: 500; }
.role-sub { color: var(--soft); font-size: 13.5px; margin: .6vh 0 1.2vh; }
.role-card ul { list-style: none; display: grid; gap: .9vh; }
.role-card li { padding: 1vh 14px 1vh 38px; position: relative; border-bottom: 1px solid var(--hair); font-size: clamp(14px, 1.8vh, 16px); animation: rise .35s both; }
.role-card li::before { content: ''; position: absolute; left: 12px; top: 50%; width: 12px; height: 12px; margin-top: -6px; border-radius: 3px; border: 1px solid var(--amber); }
.role-gain { margin-top: 1.8vh; border-left: 2px solid var(--green); padding-left: 14px; }
.role-gain span { font-size: 11.5px; color: var(--green-t); font-weight: 500; text-transform: uppercase; letter-spacing: .1em; }
.role-gain p { font-size: clamp(14px, 1.8vh, 16px); color: var(--ink); }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }
.scroll-hint { position: absolute; bottom: 2.4vh; left: 50%; transform: translateX(-50%); color: var(--soft); font-size: 11.5px; z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 6px; }
.scroll-hint span { width: 16px; height: 26px; border: 1px solid var(--soft); border-radius: 10px; position: relative; }
.scroll-hint span::after { content: ''; position: absolute; left: 50%; top: 5px; width: 2px; height: 6px; margin-left: -1px; background: var(--green); border-radius: 2px; animation: wheel 1.6s infinite; }
@keyframes wheel { to { transform: translateY(9px); opacity: 0; } }

/* ---------- 2. spirit ---------- */
.flips { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 4vh; perspective: 1200px; }
.flip { height: 25vh; min-height: 170px; outline: none; cursor: pointer; }
.flip-in { position: relative; width: 100%; height: 100%; transition: transform .7s cubic-bezier(.2, .8, .2, 1); transform-style: preserve-3d; }
.flip:hover .flip-in, .flip:focus .flip-in, .flip.done .flip-in { transform: rotateY(180deg); }
.face { position: absolute; inset: 0; backface-visibility: hidden; border-radius: 18px; padding: 3vh 28px; display: flex; flex-direction: column; justify-content: center; }
.front { background: var(--card); border: 1px dashed var(--line); }
.front small { color: var(--red); font-weight: 500; text-transform: uppercase; letter-spacing: .12em; font-size: 11.5px; }
.front b { font-size: clamp(20px, 2.9vh, 28px); font-weight: 300; color: var(--soft); text-decoration: line-through; text-decoration-color: var(--red); text-decoration-thickness: 1px; }
.front em { color: var(--soft); font-size: 11.5px; margin-top: 1.4vh; opacity: .7; }
.back { background: #fff; border: 1px solid var(--green); transform: rotateY(180deg); box-shadow: 0 10px 30px rgba(90, 181, 90, .15); }
.back small { color: var(--green-t); font-weight: 500; text-transform: uppercase; letter-spacing: .12em; font-size: 11.5px; }
.back b { font-size: clamp(20px, 2.9vh, 28px); font-weight: 400; color: var(--blue); }
.back span { color: var(--soft); margin-top: .8vh; }
.hand-row { margin-top: 5vh; display: flex; align-items: center; gap: 22px; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 2vh 26px; max-width: 900px; }
.hand { width: 68px; height: 68px; border-radius: 50%; border: 1px solid var(--blue); background: #fff; display: grid; place-items: center; flex: none; transition: .2s; }
.hand:hover { background: var(--blue); transform: rotate(-8deg); }
.hand:hover svg { stroke: #fff; }
.hand.wave { animation: wave .6s; }
.hand svg { width: 34px; height: 34px; fill: none; stroke: var(--blue); stroke-width: 1.2; stroke-linecap: round; stroke-linejoin: round; }
@keyframes wave { 25% { transform: rotate(-20deg); } 50% { transform: rotate(14deg); } 75% { transform: rotate(-10deg); } }
.hand-text { flex: 1; }
.hand-text b { display: block; font-size: clamp(16px, 2.1vh, 20px); font-weight: 400; }
.hand-text span { color: var(--soft); }
.hand-count { text-align: center; }
.hand-count b { font-size: 40px; font-weight: 200; color: var(--green-t); display: block; line-height: 1; }
.hand-count small { color: var(--soft); font-size: 11.5px; }

/* ---------- 3. demo ---------- */
.head-row { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; }
.controls { display: flex; gap: 10px; margin-bottom: 1.6vh; }
.btn { border: 1px solid var(--blue); border-radius: 30px; padding: 10px 22px; font-weight: 400; font-size: 14px; background: var(--blue); color: #fff; transition: .2s; }
.btn:hover { background: #24427f; }
.btn.ghost { background: transparent; color: var(--blue); }
.btn.ghost:hover { background: rgba(47, 82, 160, .06); }
.btn.ghost.on { border-color: var(--green); color: var(--green-t); }
.demo-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 24px; height: 66vh; min-height: 420px; }
.chat { background: #fff; border: 1px solid var(--line); border-radius: 16px; display: flex; flex-direction: column; overflow: hidden; box-shadow: 0 12px 34px rgba(30, 42, 68, .06); }
.chat-top { display: flex; align-items: center; gap: 8px; padding: 11px 16px; border-bottom: 1px solid var(--hair); font-size: 13.5px; }
.chat-top b { margin-left: 8px; font-weight: 400; }
.chat-top em { margin-left: auto; font-style: normal; color: var(--green-t); font-size: 12.5px; }
.dot { width: 10px; height: 10px; border-radius: 50%; border: 1px solid; }
.dot.r { border-color: #ff5f57; } .dot.y { border-color: #febc2e; } .dot.g { border-color: #28c840; }
.chat-body { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 12px; scroll-behavior: smooth; background: var(--fill); }
.chat-empty { margin: auto; color: var(--soft); }
.msg { max-width: 88%; padding: 10px 15px; border-radius: 14px; font-size: clamp(13px, 1.65vh, 14.5px); animation: rise .35s both; }
.msg.me { align-self: flex-end; background: var(--blue); color: #fff; border-bottom-right-radius: 4px; }
.msg.me b { color: #fff; }
.msg.ai { align-self: flex-start; background: #fff; border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.msg.note { align-self: center; background: transparent; color: var(--amber); font-size: 13px; text-align: center; border: 1px dashed rgba(214, 129, 31, .5); max-width: 95%; }
.msg.note b { color: var(--amber); }
.msg .att { display: inline-flex; align-items: center; gap: 6px; background: rgba(255, 255, 255, .18); border: 1px solid rgba(255, 255, 255, .4); border-radius: 8px; padding: 2px 9px; font-size: 12px; margin: 0 6px 6px 0; }
.msg .att i { width: 8px; height: 10px; border-radius: 2px; background: #A7E3A7; display: inline-block; }
.msg .att.doc i { background: #BFD4FF; }
.msg .paste { display: block; margin-top: 6px; padding: 6px 10px; background: rgba(255, 255, 255, .15); border-left: 2px solid #FFD38A; border-radius: 6px; font-size: 12.5px; }
.typing span { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--soft); margin: 0 2px; animation: blink 1s infinite; }
.typing span:nth-child(2) { animation-delay: .2s; } .typing span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 50% { opacity: .2; } }
.tc { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 12.5px; }
.tc th { text-align: left; color: var(--soft); font-weight: 400; padding: 4px 6px; border-bottom: 1px solid var(--line); }
.tc td { padding: 4px 6px; border-bottom: 1px solid var(--hair); }
.tc tr.bad td { background: rgba(192, 57, 43, .06); }
.tc tr.fix td { background: rgba(90, 181, 90, .09); }
.tc .tag { font-size: 11px; padding: 1px 8px; border-radius: 20px; border: 1px solid rgba(192, 57, 43, .45); color: var(--red); white-space: nowrap; }
.tc .tag.ok { border-color: rgba(90, 181, 90, .6); color: var(--green-t); }

.side { display: flex; flex-direction: column; gap: 12px; min-height: 0; }
.courier { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 14px 16px 6px; flex: 1; min-height: 0; display: flex; flex-direction: column; }
.mini-title { font-size: 13.5px; color: var(--soft); }
#courierSvg { width: 100%; flex: 1; min-height: 0; }
#courierSvg text { fill: var(--ink); font-size: 13px; text-anchor: middle; font-family: 'Be Vietnam Pro'; font-weight: 300; }
#courierSvg .src rect { fill: #fff; stroke: var(--line); stroke-width: 1; transition: .3s; }
#courierSvg .src.lit rect { stroke: var(--amber); fill: #FFF6EA; }
#courierSvg .src.used rect { stroke: var(--green); }
#courierSvg #youNode circle { fill: #fff; stroke: var(--blue); stroke-width: 1.2; }
#courierSvg #youNode text { fill: var(--blue); font-weight: 500; }
#courierSvg #aiNode rect { fill: #fff; stroke: var(--green); stroke-width: 1.2; }
#courierSvg #aiNode text { fill: var(--green-t); font-weight: 500; }
#courierSvg .sm { font-size: 10px; fill: var(--soft) !important; font-weight: 300 !important; }
#courierSvg .lk { stroke: var(--line); stroke-width: 1; fill: none; stroke-dasharray: 4 4; transition: .3s; }
#courierSvg .lk.on { stroke: var(--blue-hi); }
#courierSvg .pk { fill: var(--amber); }
#youNode.busy circle { animation: pulse .8s 2; }
@keyframes pulse { 50% { stroke-width: 6; } }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 1.1vh 12px; text-align: center; }
.stat b { font-size: clamp(24px, 3.4vh, 34px); font-weight: 200; color: var(--amber); display: block; line-height: 1.15; }
.stat span { font-size: 11.5px; color: var(--soft); }
.insight { background: rgba(109, 158, 235, .1); border-left: 2px solid var(--blue); border-radius: 6px; padding: 1.1vh 14px; font-size: clamp(13px, 1.7vh, 15px); transition: .3s; }
.insight.warn { background: rgba(214, 129, 31, .08); border-color: var(--amber); }

/* ---------- 4. memory ---------- */
.mem-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 1vh 0 2.4vh; }
.mem-tabs button { display: flex; flex-direction: column; align-items: center; gap: 3px; padding: 1.5vh 10px; border-radius: 14px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font-weight: 400; font-size: clamp(14px, 1.85vh, 16.5px); transition: .2s; }
.mem-tabs button small { color: var(--soft); font-size: 11.5px; }
.mem-tabs button svg { width: 26px; height: 26px; fill: none; stroke: var(--soft); stroke-width: 1.2; stroke-linecap: round; stroke-linejoin: round; }
.mem-tabs button:hover { border-color: var(--blue); }
.mem-tabs button.on { border-color: var(--blue); background: #fff; box-shadow: 0 8px 22px rgba(47, 82, 160, .12); color: var(--blue); }
.mem-tabs button.on svg { stroke: var(--blue); }
.mem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.brain { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 2.1vh 24px; }
.brain-head { display: flex; justify-content: space-between; align-items: baseline; }
.brain-head b { font-weight: 400; }
.brain-head span { font-size: 28px; font-weight: 200; color: var(--green-t); transition: color .3s; }
.brain.lost .brain-head span { color: var(--red); }
.meter { height: 4px; border-radius: 4px; background: var(--hair); margin: 1.2vh 0 1.5vh; overflow: hidden; }
.meter span { display: block; height: 100%; width: 100%; background: var(--grad); transition: width .9s ease; }
.brain.lost .meter span { background: var(--red); }
.mem-list { list-style: none; display: grid; gap: .5vh; }
.mem-list li { border-bottom: 1px solid var(--hair); padding: .95vh 12px .95vh 30px; position: relative; font-size: clamp(13px, 1.75vh, 15px); transition: opacity .5s, filter .5s, transform .5s; }
.mem-list li::before { content: ''; position: absolute; left: 10px; top: 50%; width: 8px; height: 8px; margin-top: -4px; border-radius: 50%; background: var(--green); }
.mem-list li.gone { opacity: .15; filter: blur(3px); transform: translateX(14px); }
.newchat { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 2.1vh 24px; display: flex; flex-direction: column; gap: 1.4vh; }
.bubble { padding: 1.1vh 16px; border-radius: 14px; font-size: clamp(14px, 1.8vh, 15.5px); max-width: 90%; transition: .4s; }
.bubble.ai { background: var(--fill); border: 1px solid var(--line); align-self: flex-start; }
.bubble.me { background: var(--blue); color: #fff; align-self: flex-end; }
.newchat .bubble.me { order: 1; } .newchat .bubble.ai { order: 2; } .newchat .stranger { order: 3; }
.stranger { margin-top: auto; display: flex; gap: 16px; align-items: flex-start; flex-wrap: wrap; opacity: 0; transform: translateY(10px); transition: .5s; }
.stranger.show { opacity: 1; transform: none; }
.stranger svg { width: 44px; height: 44px; fill: none; stroke: var(--amber); stroke-width: 1.2; stroke-linecap: round; flex: none; }
.stranger p { flex: 1; font-size: clamp(14px, 1.85vh, 16px); }
.redo { width: 100%; background: rgba(192, 57, 43, .05); border: 1px solid rgba(192, 57, 43, .3); border-radius: 12px; padding: 1vh 14px; color: var(--body); }
.redo b { font-size: 26px; font-weight: 300; color: var(--red); }
.redo u { text-decoration-color: var(--red); }

/* ---------- 5. for you ---------- */
.fy-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 30px; align-items: center; margin-top: 1vh; }
.checks { display: grid; gap: 1vh; }
.checks label { display: flex; align-items: center; gap: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 1.3vh 18px; cursor: pointer; font-size: clamp(14px, 1.9vh, 16.5px); transition: .2s; }
.checks label:hover { border-color: var(--blue); }
.checks input { display: none; }
.checks label span { width: 22px; height: 22px; border-radius: 6px; border: 1px solid var(--soft); flex: none; position: relative; transition: .2s; }
.checks input:checked + span { background: var(--green); border-color: var(--green); }
.checks input:checked + span::after { content: ''; position: absolute; left: 7px; top: 3px; width: 5px; height: 10px; border: solid #fff; border-width: 0 2px 2px 0; transform: rotate(45deg); }
.checks label:has(input:checked) { border-color: var(--green); background: #fff; color: var(--ink); }
.verdict { text-align: center; }
.gauge { width: min(330px, 100%); }
.g-bg, .g-fg { fill: none; stroke-width: 6; stroke-linecap: round; }
.g-bg { stroke: var(--hair); }
.g-fg { stroke: var(--green); stroke-dasharray: 252; stroke-dashoffset: 252; transition: stroke-dashoffset .6s ease, stroke .3s; }
.v-num { font-size: 20px; color: var(--soft); margin-top: -62px; }
.v-num b { font-size: 54px; font-weight: 200; color: var(--blue); }
.v-text { margin-top: 2vh; font-size: clamp(17px, 2.3vh, 23px); font-weight: 400; min-height: 3.2em; color: var(--soft); }
.v-text.yes { color: var(--blue); font-weight: 500; }
.shift { margin-top: 3.2vh; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 1.9vh 24px; }
.sw-row { display: flex; align-items: center; gap: 14px; justify-content: center; color: var(--soft); }
.switch { width: 58px; height: 30px; border-radius: 20px; border: 1px solid var(--line); background: #fff; position: relative; transition: .3s; }
.switch i { position: absolute; top: 4px; left: 4px; width: 20px; height: 20px; border-radius: 50%; background: var(--soft); transition: .3s; }
.shift.on .switch { background: var(--green); border-color: var(--green); }
.shift.on .switch i { left: 32px; background: #fff; }
.sw-body { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 1.3vh; }
.sw-body .col { border-radius: 12px; padding: 1.1vh 16px; transition: .4s; border: 1px solid var(--line); }
.sw-body .col b { display: block; font-size: clamp(16px, 2vh, 18px); font-weight: 400; }
.sw-body .col p { color: var(--soft); font-size: clamp(13px, 1.7vh, 14.5px); }
.sw-body .now { border-color: rgba(214, 129, 31, .5); background: rgba(214, 129, 31, .05); }
.sw-body .now b { color: var(--amber); }
.sw-body .next { opacity: .35; filter: grayscale(1); }
.shift.on .now { opacity: .35; filter: grayscale(1); }
.shift.on .next { opacity: 1; filter: none; background: rgba(90, 181, 90, .07); border-color: var(--green); }
.shift.on .next b { color: var(--green-t); }

@media (max-width: 900px) {
  .slide { height: auto; min-height: 100vh; padding: 70px 0; }
  .hero-grid, .demo-grid, .mem-grid, .fy-grid, .flips, .mem-tabs, .sw-body { grid-template-columns: 1fr; }
  .demo-grid { height: auto; } .chat { height: 60vh; } .dots { display: none; }
}