:root {
  --ai-ink: #0d1119;
  --ai-panel: #121926;
  --ai-panel-2: #192233;
  --ai-line: rgba(255, 255, 255, .12);
  --ai-paper: #f5f6f2;
  --ai-blue: #3157ff;
  --ai-acid: #d7ff56;
  --ai-muted: #667083;
}

/* Lop cong nghe hero: canvas co the bam nhan, van cho phep cuon doc tren mobile. */
.hero-ai-scene {
  position: absolute;
  inset: 0 -80px;
  z-index: 1;
  overflow: visible;
  opacity: .58;
  pointer-events: auto;
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, rgba(0, 0, 0, .08) 28%, #000 54%, #000 100%);
  mask-image: linear-gradient(90deg, transparent 0%, rgba(0, 0, 0, .08) 28%, #000 54%, #000 100%);
}
.hero-ai-scene::before {
  position: absolute;
  top: 50%;
  left: 68%;
  width: 112px;
  height: 112px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(215,255,86,.62);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(49,87,255,.26), rgba(13,17,25,.08) 68%);
  color: #d7ff56;
  content: "CODEX\A CLI";
  font: 800 12px/1.25 "Plus Jakarta Sans", sans-serif;
  text-align: center;
  white-space: pre;
  box-shadow: 0 0 42px rgba(49,87,255,.2), inset 0 0 24px rgba(215,255,86,.08);
  transform: translate(-50%, -50%);
  transition: opacity .35s ease;
}
.hero-ai-scene::after {
  position: absolute;
  top: calc(50% + 78px);
  left: 68%;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 7px;
  background: rgba(10,16,26,.78);
  color: #dce5f5;
  content: "WORD  •  EXCEL  •  AUTOCAD";
  font: 700 9px/1 "Plus Jakarta Sans", sans-serif;
  letter-spacing: .04em;
  white-space: nowrap;
  transform: translateX(-50%);
  transition: opacity .35s ease;
}
.hero-ai-scene.is-webgl-ready:not(.is-static-scene)::before,
.hero-ai-scene.is-webgl-ready:not(.is-static-scene)::after { opacity: 0; }

.hero-ai-scene canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: default;
  touch-action: pan-y;
}

.hero-ai-scene canvas.is-actionable { cursor: pointer; }

.hero-ai-actions {
  position: absolute;
  left: 50%;
  bottom: 4px;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: max-content;
  max-width: calc(100% - 20px);
  transform: translateX(-50%);
}

.hero-ai-actions a {
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 999px;
  background: rgba(10, 16, 26, .82);
  color: #dce5f5;
  font: 700 9px/1 "Plus Jakarta Sans", sans-serif;
  letter-spacing: .035em;
  text-decoration: none;
  box-shadow: 0 7px 20px rgba(0, 0, 0, .2);
  transition: border-color .18s ease, background .18s ease, color .18s ease, transform .18s ease;
}

.hero-ai-actions a > span { display: contents; }
.hero-ai-actions a b { display: none; }
.hero-ai-actions a small { font: inherit; }

.hero-ai-actions a:hover,
.hero-ai-actions a:focus-visible,
.hero-ai-actions a.is-active {
  border-color: rgba(215, 255, 86, .72);
  background: rgba(33, 46, 38, .92);
  color: #d7ff56;
  outline: none;
  transform: translateY(-2px);
}

.hero-ai-scene.is-fallback { display: none; }
.hero-shell { z-index: 2; }
.hero-copy,
.hero-visual { position: relative; z-index: 2; }

@media (min-width: 901px) {
  /*
   * Scene la mot hang rieng trong cot visual. Khong ep canvas vao dai 220px,
   * khong mask/crop va khong de mockup che model.
   */
  .hero-shell {
    grid-template-rows: minmax(300px, 340px) auto;
    column-gap: clamp(48px, 5vw, 64px);
    row-gap: 12px;
    align-items: start;
  }
  .hero-copy {
    grid-column: 1;
    grid-row: 1 / 3;
    align-self: center;
  }
  .hero-ai-scene {
    position: relative;
    inset: auto;
    grid-column: 2;
    grid-row: 1;
    z-index: 2;
    width: 100%;
    height: 100%;
    min-height: 300px;
    overflow: visible;
    opacity: 1;
    -webkit-mask-image: none;
    mask-image: none;
  }
  .hero-visual {
    grid-column: 2;
    grid-row: 2;
  }
}

@media (max-width: 900px) {
  .hero-ai-scene {
    position: relative;
    inset: auto;
    width: 100%;
    max-width: 760px;
    height: clamp(240px, 34vw, 280px);
    margin: 0 auto;
    overflow: visible;
    border-top: 1px solid rgba(117, 233, 255, .12);
    border-bottom: 1px solid rgba(215, 255, 86, .12);
    background:
      linear-gradient(rgba(117, 233, 255, .045) 1px, transparent 1px),
      linear-gradient(90deg, rgba(117, 233, 255, .045) 1px, transparent 1px);
    background-size: 28px 28px;
    opacity: .9;
    -webkit-mask-image: none;
    mask-image: none;
  }
  .hero-ai-scene::before {
    left: 50%;
    width: 96px;
    height: 96px;
    z-index: 2;
    background:
      radial-gradient(circle at 50% 42%, rgba(49,87,255,.38), rgba(13,17,25,.16) 66%),
      rgba(10,16,26,.7);
    box-shadow: 0 0 44px rgba(49,87,255,.3), inset 0 0 24px rgba(215,255,86,.1);
  }
  .hero-ai-scene::after { display: none; }
  .hero-ai-actions {
    --hero-orbit-radius: clamp(92px, 18vw, 112px);
    top: 50%;
    bottom: auto;
    width: 0;
    height: 0;
    max-width: none;
  }
  .hero-ai-actions a {
    --hero-orbit-delay: 0s;
    position: absolute;
    top: 0;
    left: 0;
    width: 76px;
    min-height: 44px;
    margin: -22px 0 0 -38px;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
    animation: hero-icon-orbit 18s linear infinite;
    animation-delay: var(--hero-orbit-delay);
    will-change: transform;
  }
  .hero-ai-actions a:nth-child(2) { --hero-orbit-delay: -4.5s; }
  .hero-ai-actions a:nth-child(3) { --hero-orbit-delay: -9s; }
  .hero-ai-actions a:nth-child(4) { --hero-orbit-delay: -13.5s; }
  .hero-ai-actions a > span {
    width: 76px;
    min-height: 44px;
    display: grid;
    grid-template-columns: 26px 1fr;
    align-items: center;
    gap: 5px;
    padding: 5px 7px;
    border: 1px solid rgba(255,255,255,.2);
    border-radius: 11px;
    background: rgba(10,16,26,.92);
    color: #dce5f5;
    box-shadow: 0 9px 24px rgba(0,0,0,.3), 0 0 18px rgba(49,87,255,.12);
    animation: hero-icon-counter-orbit 18s linear infinite;
    animation-delay: var(--hero-orbit-delay);
    will-change: transform;
  }
  .hero-ai-actions a b {
    width: 26px;
    height: 26px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(215,255,86,.36);
    border-radius: 8px;
    background: rgba(215,255,86,.08);
    color: #d7ff56;
    font-size: 9px;
    letter-spacing: -.02em;
  }
  .hero-ai-actions a small {
    color: inherit;
    font: 700 9px/1 "Plus Jakarta Sans", sans-serif;
    letter-spacing: 0;
    text-transform: none;
  }
  .hero-ai-actions a:hover,
  .hero-ai-actions a:focus-visible,
  .hero-ai-actions a.is-active {
    border: 0;
    background: transparent;
    animation-play-state: paused;
  }
  .hero-ai-actions a:hover > span,
  .hero-ai-actions a:focus-visible > span { animation-play-state: paused; }
  .hero-ai-actions a:hover > span,
  .hero-ai-actions a:focus-visible > span,
  .hero-ai-actions a.is-active > span {
    border-color: rgba(215,255,86,.72);
    background: rgba(33,46,38,.94);
    color: #d7ff56;
  }
}

@media (max-width: 760px) {
  .hero-ai-scene {
    width: 100%;
    height: clamp(240px, 68vw, 270px);
    margin: 0;
  }

  .hero-ai-actions { --hero-orbit-radius: clamp(90px, 26vw, 100px); }
}

@media (prefers-reduced-motion: no-preference) {
  .hero-ai-scene:not(.is-webgl-ready)::before { animation: hero-fallback-pulse 2.8s ease-in-out infinite; }
}

@keyframes hero-icon-orbit {
  from { transform: rotate(0deg) translateX(var(--hero-orbit-radius)); }
  to { transform: rotate(360deg) translateX(var(--hero-orbit-radius)); }
}

@keyframes hero-icon-counter-orbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}

/* Cum cong cu la dau hieu automation chinh, luon xoay nhe tren mobile/tablet. */

@keyframes hero-fallback-pulse {
  50% { box-shadow: 0 0 58px rgba(49,87,255,.34), inset 0 0 30px rgba(215,255,86,.15); transform: translate(-50%, -50%) scale(1.035); }
}

.section-heading h2,
.register h2 { text-transform: none; }

main > section[id] { scroll-margin-top: 72px; }
#checkout { scroll-margin-top: 88px; }

.hero h1 {
  max-width: 640px;
  font-size: clamp(62px, 4.8vw, 72px);
  line-height: .98;
}

.hero-title-accent { color: #c7d5ff; }
.hero-proof strong { font-size: 17px; }
.hero-proof span { max-width: 138px; }

.hero-live-stage {
  position: relative;
  min-height: 390px;
  display: grid;
  grid-template-columns: minmax(150px, .9fr) 90px minmax(180px, 1.05fr);
  gap: 16px;
  align-items: center;
  padding: 22px;
  background:
    linear-gradient(rgba(49, 87, 255, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(49, 87, 255, .07) 1px, transparent 1px),
    #eef2f8;
  background-size: 28px 28px;
}

.hero-flow-layer { position: absolute; inset: 0; z-index: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; }
.hero-flow-path { fill: none; stroke: rgba(122, 157, 255, .44); stroke-width: 1.4; vector-effect: non-scaling-stroke; }
.hero-flow-output { stroke: rgba(215, 255, 86, .42); }

.hero-live-stage::before {
  position: absolute;
  top: 50%;
  right: 20%;
  left: 20%;
  border-top: 1px dashed #8fa2ce;
  content: "";
}

.hero-request {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  padding: 17px;
  border: 1px solid #d1d9e7;
  border-radius: 9px;
  background: rgba(255,255,255,.94);
  box-shadow: 0 14px 32px rgba(30,45,68,.1);
}
.hero-request small { color: #3157ff; font-size: 8px; font-weight: 800; }
.hero-request p { margin: 0; color: #273247; font-size: 13px; font-weight: 700; line-height: 1.45; }
.hero-request span { width: fit-content; padding: 7px 8px; border-radius: 5px; background: #e9eef8; color: #657087; font-size: 9px; font-weight: 700; }

.hero-ai-hub { position: relative; z-index: 1; display: grid; place-items: center; text-align: center; }
.hero-ai-hub > i { position: absolute; width: 82px; height: 82px; border: 1px solid rgba(49,87,255,.28); border-radius: 50%; }
.hero-ai-hub b { width: 58px; height: 58px; display: grid; place-content: center; gap: 2px; border: 1px solid #91bb2c; border-radius: 50%; background: #202b17; box-shadow: 0 0 0 9px rgba(153,195,53,.1), 0 0 28px rgba(153,195,53,.24); color: #d7ff56; line-height: 1; }
.hero-ai-hub b span { font-size: 9px; font-weight: 800; }
.hero-ai-hub b em { color: #ffffff; font-size: 7px; font-style: normal; font-weight: 700; }
.hero-ai-hub small { margin-top: 22px; color: #52617b; font-size: 7px; font-weight: 800; }

.hero-output-stack { position: relative; z-index: 3; display: grid; gap: 8px; }
.hero-output { min-height: 68px; display: grid; grid-template-columns: 42px 1fr; gap: 4px 10px; align-items: center; padding: 10px; border: 1px solid #d3dbe7; border-radius: 8px; background: rgba(255,255,255,.95); box-shadow: 0 10px 24px rgba(30,45,68,.08); }
.hero-output > b { grid-row: 1 / 3; width: 40px; height: 40px; display: grid; place-items: center; border-radius: 6px; background: #e8edff; color: #3157ff; font-size: 9px; }
.hero-output > strong { overflow: hidden; color: #27354d; font-size: 10px; font-weight: 800; text-overflow: ellipsis; white-space: nowrap; }
.hero-output em { color: #667287; font-size: 8px; font-style: normal; font-weight: 700; }
.hero-output-sheet > b { background: #e9f5dc; color: #47742b; font-size: 7px; }
.hero-output-code > b { background: #1b2431; color: #d7ff56; }
.hero-output-code code { color: #253147; font-size: 9px; font-weight: 800; }

@media (prefers-reduced-motion: no-preference) {
  .motion-ready .hero.motion-in-view .hero-ai-hub b { animation: hero-ai-pulse 3s ease-in-out infinite; }
  .motion-ready .hero.motion-in-view .hero-output { animation: hero-output-ready 6s ease-in-out infinite; }
  .motion-ready .hero.motion-in-view .hero-output:nth-child(2) { animation-delay: .35s; }
  .motion-ready .hero.motion-in-view .hero-output:nth-child(3) { animation-delay: .7s; }
  .motion-ready .hero.motion-in-view .hero-flow-input { stroke-dasharray: 14 14; animation: hero-flow-travel 3.2s linear infinite; }
  .motion-ready .hero.motion-in-view .hero-flow-output { stroke-dasharray: 12 16; animation: hero-flow-travel 4.4s linear infinite; }
  .motion-ready .hero.motion-in-view .hero-flow-output-two { animation-delay: .4s; }
  .motion-ready .hero.motion-in-view .hero-flow-output-three { animation-delay: .8s; }
}

@keyframes hero-ai-pulse { 50% { box-shadow: 0 0 0 14px rgba(153,195,53,.06), 0 0 38px rgba(153,195,53,.38); } }
@keyframes hero-output-ready { 0%, 12% { opacity: .55; transform: translateX(8px); } 32%, 100% { opacity: 1; transform: translateX(0); } }
@keyframes hero-flow-travel { to { stroke-dashoffset: -120; } }

.pain .section-heading { max-width: 940px; }
.pain { padding-top: 88px; }
.pain .section-heading h2 { max-width: 850px; margin-right: auto; margin-left: auto; }

.project-thread {
  position: relative;
  overflow: hidden;
  max-width: none;
  padding: 120px max(24px, calc((100vw - 1180px) / 2));
  background:
    linear-gradient(rgba(49, 87, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(49, 87, 255, .04) 1px, transparent 1px),
    #f8f9f6;
  background-size: 40px 40px;
}

.project-thread::after {
  position: absolute;
  right: max(24px, calc((100vw - 1180px) / 2));
  bottom: 0;
  left: max(24px, calc((100vw - 1180px) / 2));
  height: 1px;
  background: linear-gradient(90deg, transparent, #a9b6dd 15%, #a9b6dd 85%, transparent);
  content: "";
}

.project-file-rail {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
  gap: 14px;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
}

.project-file-rail > span {
  min-width: 0;
  min-height: 112px;
  display: grid;
  align-content: center;
  gap: 10px;
  padding: 18px;
  border: 1px solid #d9ded5;
  border-radius: 10px;
  background: rgba(255, 255, 255, .84);
  box-shadow: 0 14px 34px rgba(26, 35, 49, .06);
}

.project-file-rail b {
  width: fit-content;
  padding: 6px 8px;
  border-radius: 5px;
  background: #e8edff;
  color: #294dc8;
  font: 750 12px/1 "Plus Jakarta Sans", sans-serif;
}

.project-file-rail small {
  overflow: hidden;
  color: #394150;
  font-size: 13px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.project-file-rail > i { color: #8090b9; font-style: normal; }
.project-rule { max-width: 920px; margin: 34px auto 0; color: #5c6574; font-size: 17px; text-align: center; }
.project-rule span,
.project-rule strong { color: #172036; }
.project-rule i { margin: 0 10px; color: #aeb7c6; font-style: normal; }

.intent-selector {
  max-width: none;
  padding: 88px max(24px, calc((100vw - 1180px) / 2));
  background: #f8f9f6;
}

.intent-selector-heading {
  display: grid;
  grid-template-columns: 1.05fr .65fr;
  gap: 72px;
  align-items: end;
  max-width: 1180px;
  margin: 0 auto 34px;
}

.intent-selector-heading h2 { max-width: 720px; font-size: clamp(38px, 4.3vw, 56px); }
.intent-selector-heading > p { max-width: 430px; margin: 0 0 5px; color: #5c6574; font-size: 16px; line-height: 1.65; }

.intent-selector-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  max-width: 1180px;
  margin: 0 auto;
}

.intent-card {
  position: relative;
  min-width: 0;
  min-height: 270px;
  display: flex;
  flex-direction: column;
  padding: 24px;
  overflow: hidden;
  border: 1px solid #d9ded5;
  border-radius: 12px;
  background: rgba(255, 255, 255, .92);
  box-shadow: 0 14px 34px rgba(26, 35, 49, .055);
  transition: border-color .2s, box-shadow .2s, transform .2s;
}

.intent-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: var(--intent-color, #3157ff);
  content: "";
}

.intent-card:hover,
.intent-card:focus-visible {
  border-color: color-mix(in srgb, var(--intent-color, #3157ff) 42%, #d9ded5);
  box-shadow: 0 20px 44px rgba(26, 35, 49, .11);
  transform: translateY(-3px);
}

.intent-card-word { --intent-color: #3157ff; }
.intent-card-excel { --intent-color: #3bab69; }
.intent-card-progress { --intent-color: #d69a24; }
.intent-card-lisp { --intent-color: #8dc63f; }
.intent-card > span { color: var(--intent-color); font-size: 11px; font-weight: 800; letter-spacing: .045em; }
.intent-card > strong { margin-top: 22px; color: #182033; font-size: 23px; line-height: 1.22; letter-spacing: -.025em; }
.intent-card > small { margin-top: 12px; color: #5c6574; font-size: 13px; line-height: 1.6; }
.intent-card > b { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: auto; padding-top: 22px; color: #182033; font-size: 13px; }
.intent-card > b i { color: var(--intent-color); font-size: 17px; font-style: normal; }

.intent-course-guide {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  max-width: 1180px;
  margin: 18px auto 0;
  overflow: hidden;
  border: 1px solid #d9ded5;
  border-radius: 10px;
  background: #eef1ea;
}

.intent-course-guide > span { padding: 16px 18px; color: #596158; font-size: 12px; line-height: 1.55; }
.intent-course-guide > span + span { border-left: 1px solid #d9ded5; }
.intent-course-guide b { display: block; margin-bottom: 3px; color: #172036; font-size: 13px; }
.intent-course-guide a { color: #3157ff; text-decoration: underline; text-decoration-color: rgba(49,87,255,.3); text-underline-offset: 2px; transition: text-decoration-color .2s; }
.intent-course-guide a:hover { text-decoration-color: #3157ff; }

#demos,
#word-ai-lab,
#intent-tiendo-qlda,
#intent-excel-tiendo,
#intent-qaqc-quality,
#intent-hoso-qaqc,
#word-course,
#excel-course,
#autolisp-course,
#mentoring-course { scroll-margin-top: 84px; }

.ai-lab {
  max-width: none;
  padding: 128px max(24px, calc((100vw - 1240px) / 2));
  background:
    radial-gradient(circle at 76% 16%, rgba(49, 87, 255, .18), transparent 31%),
    #0d1119;
  color: #f4f6fb;
}

.ai-lab .section-heading { max-width: 1180px; }
.ai-lab .eyebrow { color: #aab9e7; }
.ai-lab .section-heading h2 { max-width: 700px; color: #f4f6fb; }
.ai-lab .split-heading > p { color: #aeb7c8; }

.lab-shell {
  max-width: 1240px;
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid var(--ai-line);
  border-radius: 16px;
  background: rgba(18, 25, 38, .92);
  box-shadow: 0 42px 120px rgba(0, 0, 0, .38);
}

.lab-tabs {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-bottom: 1px solid var(--ai-line);
  background: rgba(255, 255, 255, .025);
}

.lab-tabs button {
  min-width: 0;
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 12px;
  border: 0;
  border-right: 1px solid var(--ai-line);
  background: transparent;
  color: #9ea8ba;
  font: 700 13px/1 "Plus Jakarta Sans", "Be Vietnam Pro", sans-serif;
  cursor: pointer;
}

.lab-tabs button:last-child { border-right: 0; }
.lab-tabs button span { color: #65718a; font-size: 10px; }
.lab-tabs button:hover { background: rgba(255, 255, 255, .045); color: #ffffff; }
.lab-tabs button[aria-selected="true"] { background: rgba(49, 87, 255, .14); color: #ffffff; box-shadow: inset 0 -2px var(--ai-acid); }
.lab-tabs button[aria-selected="true"] span { color: var(--ai-acid); }
.lab-tabs button:focus-visible { outline: 2px solid var(--ai-acid); outline-offset: -3px; }

/* Thanh xu ly rieng cho mobile: noi dung luon hien, chuyen dong chi cap nhat trang thai. */
.lab-mobile-run { display: none; }

.lab-stage { min-height: 610px; }
.lab-scene[hidden] { display: none !important; }
.lab-scene {
  min-height: 610px;
  display: grid;
  grid-template-columns: minmax(0, 1.42fr) minmax(310px, .58fr);
  gap: clamp(34px, 5vw, 70px);
  align-items: center;
  padding: clamp(28px, 4vw, 54px);
}

.lab-visual {
  position: relative;
  min-width: 0;
  min-height: 480px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .13);
  border-radius: 12px;
  background: #f4f6fa;
  color: #18202e;
  box-shadow: 0 26px 64px rgba(0, 0, 0, .24);
}

.lab-window-bar {
  min-height: 46px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  padding: 0 15px;
  border-bottom: 1px solid rgba(20, 29, 43, .12);
  background: #ffffff;
  color: #6f7888;
  font: 700 10px/1 "Plus Jakarta Sans", sans-serif;
}

.lab-window-bar > span { display: flex; gap: 5px; }
.lab-window-bar > span i { width: 7px; height: 7px; border-radius: 50%; background: #c8ced7; }
.lab-window-bar b { overflow: hidden; color: #283142; font-size: 10px; text-align: center; text-overflow: ellipsis; white-space: nowrap; }
.lab-window-bar em { justify-self: end; color: #3157ff; font-size: 9px; font-style: normal; white-space: nowrap; }

.lab-copy { max-width: 420px; }
.lab-kicker { margin: 0 0 18px; color: #9fb1e8; font-size: 12px; font-weight: 750; letter-spacing: .04em; text-transform: uppercase; }
.lab-copy h3 { margin: 0 0 20px; color: #ffffff; font-size: clamp(30px, 3vw, 42px); font-weight: 650; line-height: 1.08; }
.lab-copy > p:not(.lab-kicker) { margin: 0; color: #b6c0d1; font-size: 16px; line-height: 1.7; }
.lab-copy > strong { display: flex; gap: 9px; align-items: flex-start; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--ai-line); color: #e7ebf4; font-size: 14px; line-height: 1.5; }
.lab-copy > strong i { width: 20px; height: 20px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 50%; background: var(--ai-acid); color: #16200a; font-size: 11px; font-style: normal; }

.lab-word { background: #e9edf3; }
.lab-word-page {
  width: min(440px, calc(100% - 44px));
  min-height: 400px;
  margin: 18px auto;
  padding: 34px 38px 28px;
  border: 1px solid #d3d9e2;
  border-radius: 5px;
  background: #ffffff;
  box-shadow: 0 14px 32px rgba(32, 43, 59, .11);
  text-align: center;
}
.lab-word-page > small { color: #596173; font-size: 9px; }
.lab-document-title { margin: 13px 0 26px; color: #141a24; font-size: 16px; font-weight: 800; }
.lab-word-field { display: grid; grid-template-columns: 84px 1fr; gap: 12px; padding: 10px 0; border-bottom: 1px solid #e5e8ee; text-align: left; }
.lab-word-field b { color: #4f596b; font-size: 10px; }
.lab-word-field span { overflow: hidden; color: #253247; font-size: 11px; font-weight: 700; white-space: nowrap; }
.lab-document-lines { display: grid; gap: 8px; margin: 24px 0; }
.lab-document-lines i { height: 5px; border-radius: 3px; background: #e2e6ed; }
.lab-document-lines i:nth-child(2) { width: 88%; }
.lab-document-lines i:nth-child(3) { width: 70%; }
.lab-word-page > p { display: inline-flex; align-items: center; gap: 7px; margin: 0; padding: 8px 10px; border-radius: 5px; background: #eef7dc; color: #31531f; font-size: 10px; font-weight: 700; }
.lab-word-page > p span { width: 16px; height: 16px; display: grid; place-items: center; border-radius: 50%; background: #a7da4e; color: #16200a; }

.lab-excel { padding-bottom: 18px; background: #eef2f7; }
.lab-sheet-grid { display: grid; grid-template-columns: 1.2fr repeat(3, 1fr); margin: 18px; overflow: hidden; border: 1px solid #cfd7e3; border-radius: 7px; background: #ffffff; }
.lab-sheet-grid > * { min-height: 43px; display: grid; place-items: center; padding: 6px; border-right: 1px solid #dce2eb; border-bottom: 1px solid #dce2eb; color: #4e596a; font-size: 11px; }
.lab-sheet-grid > b { background: #dce8ff; color: #28478d; }
.lab-sheet-grid > strong { background: #efffd4; color: #315719; }
.lab-sheet-result { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 0 18px; }
.lab-sheet-result > span { display: grid; gap: 5px; padding: 13px; border: 1px solid #d5dce7; border-radius: 7px; background: #ffffff; }
.lab-sheet-result small { color: #7a8494; font-size: 9px; }
.lab-sheet-result b { color: #2443aa; font-size: 18px; }
.lab-sheet-result em { grid-column: 1 / 3; padding: 9px 11px; border-radius: 5px; background: #e8f1ff; color: #31518f; font-size: 10px; font-style: normal; font-weight: 700; }

.lab-sources { display: grid; grid-template-columns: 210px 1fr; background: #f6f7fb; }
.lab-source-list { display: grid; align-content: start; gap: 8px; padding: 22px 14px; border-right: 1px solid #d8deea; background: #eef1f7; }
.lab-source-list > small { margin: 0 6px 8px; color: #758096; font-size: 9px; font-weight: 800; }
.lab-source-list > span { display: grid; grid-template-columns: 34px 1fr; gap: 8px; align-items: center; min-height: 52px; padding: 8px; border: 1px solid transparent; border-radius: 7px; color: #5d6676; font-size: 10px; font-weight: 700; }
.lab-source-list > span b { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 5px; background: #ffffff; color: #3157ff; font-size: 8px; }
.lab-source-list > span.is-source-active { border-color: #b8c7f6; background: #ffffff; color: #26324a; }
.lab-source-answer { display: grid; align-content: center; padding: 34px; }
.lab-question { margin-bottom: 24px; padding: 13px 15px; border: 1px solid #d9dfe9; border-radius: 8px; background: #ffffff; color: #263247; font-size: 12px; font-weight: 700; }
.lab-source-answer > p { margin: 0; color: #354054; font-size: 15px; line-height: 1.75; }
.lab-source-answer sup { padding: 2px 4px; border-radius: 3px; background: #e5ebff; color: #3157ff; font-size: 9px; font-weight: 800; }
.lab-citations { display: grid; gap: 8px; margin-top: 24px; }
.lab-citations span { padding: 9px 10px; border-left: 2px solid #3157ff; background: #eef2ff; color: #59657c; font-size: 10px; }
.lab-citations b { color: #3157ff; }

.lab-cad { background: #0d1319; }
.lab-cad > img { width: 100%; height: 100%; min-height: 480px; display: block; object-fit: cover; opacity: .54; filter: saturate(.72) contrast(1.16); }
.lab-cad-prompt { position: absolute; top: 24px; left: 24px; width: min(320px, calc(100% - 48px)); padding: 14px; border: 1px solid rgba(255, 255, 255, .18); border-radius: 8px; background: rgba(13, 18, 26, .9); color: #ffffff; }
.lab-cad-prompt small { color: #9faad0; font-size: 8px; font-weight: 800; }
.lab-cad-prompt p { margin: 7px 0 0; font-size: 11px; line-height: 1.5; }
.lab-cad-command { position: absolute; right: 24px; bottom: 24px; left: 24px; display: grid; grid-template-columns: 1fr auto; gap: 6px 18px; padding: 14px; border: 1px solid rgba(255, 255, 255, .18); border-radius: 8px; background: rgba(6, 10, 14, .92); color: #d8e0ed; }
.lab-cad-command code { grid-column: 1 / 3; color: #d7ff56; font-size: 11px; }
.lab-cad-command span,
.lab-cad-command b { font-size: 10px; }
.lab-cad-command b { color: #b7d5ff; }
.lab-cad > svg { position: absolute; inset: 120px 50px 90px auto; width: 44%; height: 46%; fill: none; stroke: #d7ff56; stroke-width: 2; filter: drop-shadow(0 0 5px rgba(215, 255, 86, .6)); }
.lab-cad > svg circle { fill: #d7ff56; }

.lab-terminal { background: #0a0f16; color: #dce5f4; }
.lab-terminal .lab-window-bar { border-color: rgba(255,255,255,.1); background: #151c28; color: #9ca8bb; }
.lab-terminal .lab-window-bar b { color: #e7edf7; }
.lab-terminal-body { padding: 28px; font-family: Consolas, "SFMono-Regular", monospace; }
.lab-terminal-body > p { margin: 0 0 26px; padding: 13px; border: 1px solid rgba(255,255,255,.11); border-radius: 6px; background: #111925; color: #f2f5fa; font-size: 12px; line-height: 1.5; }
.lab-terminal-body > p b { color: #d7ff56; }
.lab-terminal-body code { display: block; color: #aebbd0; font-size: 12px; line-height: 2; }
.lab-terminal-body code span { display: inline-block; width: 58px; color: #7da4ff; }
.lab-terminal-body code em { color: #9fd764; font-style: normal; }
.lab-test-pass { display: flex; gap: 12px; align-items: center; margin-top: 28px; padding: 14px; border: 1px solid rgba(215,255,86,.25); border-radius: 7px; background: rgba(215,255,86,.07); }
.lab-test-pass > i { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: #d7ff56; color: #16200a; font-style: normal; }
.lab-test-pass span { display: grid; gap: 4px; }
.lab-test-pass b { color: #eff5dd; font-size: 12px; }
.lab-test-pass small { color: #9dad89; font-size: 9px; }

.lab-git { padding: 24px; background: #f5f7fa; }
.lab-git-head { min-height: 52px; display: flex; align-items: center; justify-content: space-between; padding: 0 16px; border: 1px solid #d9dfe8; border-radius: 8px 8px 0 0; background: #ffffff; color: #30394a; font-size: 11px; font-weight: 750; }
.lab-git-head b { padding: 6px 10px; border-radius: 5px; background: #edf1f7; font-size: 9px; }
.lab-git-diff { padding: 22px; border: 1px solid #d9dfe8; border-top: 0; background: #ffffff; }
.lab-git-diff > small { color: #7c8799; font-size: 9px; font-weight: 800; }
.lab-git-diff p { display: grid; grid-template-columns: 42px 42px 1fr; gap: 5px; margin: 14px 0 0; padding: 10px; border-radius: 5px; background: #f7f8fa; color: #3c4758; font-size: 11px; }
.lab-git-diff p span { color: #2d7f42; }
.lab-git-diff p i { color: #bd4a4a; font-style: normal; }
.lab-pipeline { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 18px; }
.lab-pipeline > span { min-height: 110px; display: grid; align-content: center; gap: 5px; padding: 14px; border: 1px solid #d9dfe8; border-radius: 8px; background: #ffffff; }
.lab-pipeline i { width: 22px; height: 22px; display: grid; place-items: center; margin-bottom: 7px; border-radius: 50%; background: #d7ff56; color: #1c260d; font-size: 10px; font-style: normal; }
.lab-pipeline b { color: #323c4d; font-size: 11px; }
.lab-pipeline small { color: #7b8595; font-size: 9px; }
.lab-pipeline .is-running { border-color: #aebef1; background: #f0f3ff; }
.lab-pipeline .is-running i { background: transparent; border: 2px solid #3157ff; border-top-color: transparent; }

.lab-footer {
  min-height: 70px;
  display: grid;
  grid-template-columns: 1fr 180px auto;
  gap: 20px;
  align-items: center;
  padding: 12px 18px;
  border-top: 1px solid var(--ai-line);
  color: #9fa9ba;
  font-size: 12px;
}
.lab-footer > span { display: flex; align-items: center; gap: 9px; }
.lab-footer > span i { width: 8px; height: 8px; flex: 0 0 auto; border-radius: 50%; background: var(--ai-acid); box-shadow: 0 0 14px rgba(215,255,86,.6); }
.lab-footer > a { min-height: 44px; display: inline-flex; align-items: center; gap: 10px; padding: 0 15px; border-radius: 7px; background: var(--ai-acid); color: #12180b; font-weight: 750; }
.lab-progress { height: 3px; overflow: hidden; border-radius: 2px; background: rgba(255,255,255,.1); }
.lab-progress b { width: 100%; height: 100%; display: block; background: linear-gradient(90deg, #6384ff, var(--ai-acid)); transform: scaleX(0); transform-origin: left; }
.lab-shell.is-playing .lab-progress b { animation: lab-progress 7s linear infinite; }

/* Khung AI Lab lay cam hung tu ban Stitch: sidebar desktop, workspace trung tam. */
@media (min-width: 901px) {
  .lab-shell { display: grid; grid-template-columns: 218px minmax(0, 1fr); }
  .lab-tabs { display: grid; grid-auto-rows: minmax(72px, 1fr); grid-template-columns: 1fr; align-content: start; border-right: 1px solid var(--ai-line); border-bottom: 0; background: rgba(255,255,255,.018); }
  .lab-tabs button { justify-content: flex-start; gap: 12px; padding: 0 22px; border-right: 0; border-bottom: 1px solid var(--ai-line); text-align: left; }
  .lab-tabs button[aria-selected="true"] { box-shadow: inset 3px 0 var(--ai-acid); }
  .lab-stage { min-width: 0; }
  .lab-footer { grid-column: 2; }
}

.control-gate { max-width: none; padding: 112px max(24px, calc((100vw - 1180px) / 2)); background: #f4f6fa; }
.control-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 18px; align-items: center; max-width: 1180px; margin: 0 auto; }
.control-flow article { min-height: 0; padding: 26px; border: 1px solid #d9dfe8; border-radius: 12px; background: #ffffff; }
.control-flow article > span { color: #3157ff; font: 800 11px/1 "Plus Jakarta Sans", sans-serif; }
.control-flow h3 { margin: 22px 0 10px; font-size: 24px; }
.control-flow p { margin: 0; color: #6b7483; font-size: 14px; line-height: 1.6; }
.control-connector { color: #8d9ab6; font-size: 20px; font-style: normal; }
.control-file { min-height: 66px; display: grid; grid-template-columns: 48px 1fr; gap: 7px 12px; align-items: center; margin-top: 18px; }
.control-file > b { grid-row: 1 / 3; width: 48px; height: 58px; display: grid; place-items: center; border-radius: 7px; background: #e8edff; color: #3157ff; }
.control-file > div { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; padding-bottom: 5px; border-bottom: 1px solid #e1e6ef; }
.control-file small { color: #8090a8; font-size: 8px; font-weight: 800; }
.control-file strong { color: #39475d; font-size: 10px; white-space: nowrap; }
.control-rules { min-height: 66px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; align-items: start; margin-top: 18px; }
.control-rules > div { display: grid; justify-items: center; gap: 6px; color: #68748a; font-size: 9px; text-align: center; }
.control-rules i { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; background: #eff8df; color: #4f7128; font-style: normal; }
.control-rules > div:nth-child(2) i { background: #fff1d8; color: #9a6819; }
.control-approved { border-color: #aec5ff !important; background: linear-gradient(145deg, #ffffff, #eff3ff) !important; }
.control-sign { min-height: 66px; display: flex; gap: 12px; align-items: center; margin-top: 18px; }
.control-sign i { width: 50px; height: 50px; display: grid; place-items: center; border-radius: 50%; background: var(--ai-acid); color: #17200c; font-style: normal; }
.control-sign div { display: grid; gap: 4px; }
.control-sign b { color: #29469f; font-size: 12px; }
.control-sign small { color: #64718a; font-size: 10px; }

@media (prefers-reduced-motion: no-preference) {
  .control-flow article { position: relative; overflow: hidden; }
  .control-flow article::after { position: absolute; right: 18px; bottom: 18px; left: 18px; height: 2px; transform: scaleX(.18); transform-origin: left; background: linear-gradient(90deg, #3157ff, var(--ai-acid)); content: ""; opacity: .22; }
  .motion-ready .control-flow.motion-in-view article::after { animation: control-flow-state 7.2s ease-in-out infinite; }
  .motion-ready .control-flow.motion-in-view article:nth-of-type(2)::after { animation-delay: 1.1s; }
  .motion-ready .control-flow.motion-in-view article:nth-of-type(3)::after { animation-delay: 2.2s; }
  .motion-ready .control-flow.motion-in-view .control-connector { animation: control-connector-pulse 3.6s ease-in-out infinite; }
  .motion-ready .control-flow.motion-in-view .control-connector:nth-of-type(2) { animation-delay: .7s; }
}
@keyframes control-flow-state { 0%, 22%, 100% { opacity: .18; transform: scaleX(.18); } 42%, 66% { opacity: 1; transform: scaleX(1); } }
@keyframes control-connector-pulse { 0%, 45%, 100% { color: #8d9ab6; transform: translateX(0); } 55% { color: #3157ff; transform: translateX(4px); } }

.proof-section { padding-top: 128px; padding-bottom: 128px; }
.proof-note { max-width: 1180px; display: flex; justify-content: space-between; gap: 20px; margin: 24px auto 0; padding: 18px 20px; border: 1px solid rgba(255,255,255,.14); border-radius: 9px; background: rgba(255,255,255,.06); color: #adb7c8; font-size: 13px; }
.proof-note strong { color: #e5ebf6; }

.fit-strip { padding-top: 108px; padding-bottom: 108px; }
.fit-strip .audience-list span { min-height: 60px; }

.infrastructure { max-width: none; padding: 128px max(24px, calc((100vw - 1180px) / 2)); background: #111722; color: #ffffff; }
.infrastructure .section-heading { max-width: 1180px; margin-right: auto; margin-left: auto; }
.infrastructure .eyebrow { color: #aebbe0; }
.infrastructure .section-heading h2 { color: #ffffff; }
.infrastructure .section-heading > p { color: #b8c2d3; }
.infra-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; gap: 12px; align-items: center; max-width: 1180px; margin: 0 auto; }
.infra-flow article { min-height: 228px; display: grid; align-content: start; gap: 14px; padding: 24px; border: 1px solid rgba(255,255,255,.13); border-radius: 12px; background: linear-gradient(145deg, rgba(255,255,255,.08), rgba(255,255,255,.035)); }
.infra-flow article span { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: #d7ff56; color: #17200c; font: 800 10px/1 "Plus Jakarta Sans", sans-serif; }
.infra-flow article b { margin-top: 18px; color: #ffffff; font-size: 19px; }
.infra-flow article p { margin: 0; color: #b9c3d4; font-size: 14px; line-height: 1.58; }
.infra-flow > i { color: #d7ff56; font-size: 20px; font-style: normal; }
.sponsor-benefits { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; max-width: 1180px; margin: 20px auto 0; }
.sponsor-benefits article { display: grid; gap: 8px; padding: 22px 24px; border: 1px solid rgba(215,255,86,.3); border-radius: 12px; background: linear-gradient(135deg, rgba(215,255,86,.14), rgba(99,132,255,.1)); }
.sponsor-benefits span { color: #d7ff56; font-size: 12px; font-weight: 800; text-transform: uppercase; }
.sponsor-benefits strong { color: #ffffff; font-size: 22px; }
.sponsor-benefits small { max-width: 52ch; color: #bac5d6; font-size: 13px; line-height: 1.55; }
.ownership-note { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; max-width: 1180px; margin: 20px auto 0; padding: 18px 20px; border: 1px solid rgba(215,255,86,.24); border-radius: 10px; background: rgba(215,255,86,.07); }
.ownership-note strong { margin-right: 4px; color: #d7ff56; font-size: 14px; }
.ownership-note span { padding: 7px 9px; border: 1px solid rgba(255,255,255,.14); border-radius: 6px; color: #eef3fb; font-size: 12px; }
.ownership-note em { flex-basis: 100%; color: #aeb9ca; font-size: 12px; font-style: normal; }
.infra-cost { max-width: 1180px; margin: 14px auto 0; color: #aeb9ca; font-size: 13px; line-height: 1.6; }
.infra-cost strong { color: #e8edf6; }

.program-v2 { max-width: none; padding: 128px max(24px, calc((100vw - 1180px) / 2)); background: #f0f2fb; }
.session-map { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; max-width: 1180px; margin: 0 auto; padding: 0; list-style: none; }
.session-map > li { min-height: 0; padding: 24px; border: 1px solid #d9dfec; border-radius: 12px; background: #ffffff; }
.session-map > li > span { color: #3157ff; font: 800 12px/1 "Plus Jakarta Sans", sans-serif; }
.session-map > li > p { margin: 22px 0 8px; color: #3157ff; font-size: 12px; font-weight: 750; text-transform: uppercase; }
.session-map h3 { margin: 0 0 14px; font-size: 22px; line-height: 1.18; }
.session-map small { color: #566176; font-size: 12px; line-height: 1.5; }
.session-art { position: relative; min-height: 116px; display: grid; gap: 6px; margin-top: 24px; padding: 16px; overflow: hidden; border-radius: 8px; background: #eef2f8; }
.session-art > b { position: absolute; top: 12px; right: 12px; min-width: 34px; min-height: 28px; display: grid; place-items: center; padding: 0 7px; border-radius: 6px; background: #3157ff; color: #ffffff; font: 800 9px/1 "Plus Jakarta Sans", sans-serif; }
.session-doc { align-content: start; padding-right: 68px; background: #f7f8fb; }
.session-doc > strong { color: #29364c; font-size: 10px; }
.session-doc > i { color: #627087; font-size: 9px; font-style: normal; }
.session-doc > em { width: fit-content; margin-top: 3px; padding: 4px 6px; border-radius: 4px; background: #ebf5da; color: #406426; font-size: 8px; font-style: normal; font-weight: 800; }
.session-sheet { grid-template-columns: 1fr 1fr; gap: 0; padding: 14px 58px 14px 14px; background: #f7faf3; }
.session-sheet > strong, .session-sheet > i { padding: 5px 6px; border-right: 1px solid #d8e2d4; border-bottom: 1px solid #d8e2d4; color: #53624f; font-size: 8px; font-style: normal; }
.session-sheet > strong { background: #e5efd9; color: #426329; font-weight: 800; }
.session-sheet > i:nth-of-type(even) { color: #4a762c; font-weight: 800; }
.session-sheet > b { background: #3f6c20; }
.session-cad { place-items: center; background: #172128; }
.session-cad > svg { width: 100%; height: 76px; }
.session-cad path { fill: none; stroke: #6dffb1; stroke-width: 3; stroke-linecap: round; }
.session-cad circle { fill: #d7ff56; }
.session-cad > em, .session-code > em { position: absolute; bottom: 10px; left: 12px; padding: 4px 6px; border-radius: 4px; background: rgba(215,255,86,.14); color: #d7ff56; font-size: 8px; font-style: normal; font-weight: 800; }
.session-cad > b { background: #d7ff56; color: #17200c; }
.session-code { align-content: center; padding-right: 74px; background: #111824; }
.session-code code { display: grid; gap: 7px; color: #8facff; font: 700 9px/1 Consolas, monospace; }
.session-code code i { color: inherit; font-style: normal; }
.session-code code i:nth-child(3) { color: #d7ff56; }
.session-code > b { border-radius: 50%; background: #d7ff56; color: #17200c; }
.session-server { align-content: center; padding-right: 78px; background: #172132; }
.session-server > i { height: 8px; border-radius: 3px; background: linear-gradient(90deg, #7292ff 0 60%, rgba(255,255,255,.13) 60%); }
.session-server > i:nth-of-type(2) { background: linear-gradient(90deg, #d7ff56 0 78%, rgba(255,255,255,.13) 78%); }
.session-server > strong { color: #eaf0fb; font-size: 9px; }
.session-server > em, .session-bot > em { position: absolute; bottom: 10px; left: 12px; color: #d7ff56; font-size: 8px; font-style: normal; font-weight: 800; }
.session-bot { align-content: center; padding-right: 72px; background: #172128; }
.session-bot > div { display: grid; gap: 6px; }
.session-bot > div i { width: fit-content; padding: 5px 8px; border-radius: 10px 10px 10px 3px; background: rgba(115,146,255,.2); color: #dce5ff; font-size: 8px; font-style: normal; }
.session-bot > div i:nth-child(2) { margin-left: 18px; background: rgba(215,255,86,.14); color: #d7ff56; }
.session-bot > b { background: #2c9bdb; }
.support-rail { min-height: 88px; display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 20px; align-items: center; max-width: 1180px; margin: 18px auto 0; padding: 16px 22px; border: 1px solid #d4daea; border-radius: 10px; background: #ffffff; }
.support-rail > span { display: grid; gap: 5px; }
.support-rail b { color: #2d3850; font-size: 14px; }
.support-rail small { color: #566176; font-size: 12px; }
.schedule-note { max-width: 1180px; margin: 14px auto 0; color: #4c5870; font-size: 14px; line-height: 1.55; }

.hero-offer-line { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 18px; max-width: 760px; margin: -8px auto 25px; color: #c5cede; font-size: 14px; line-height: 1.5; }
.hero-offer-line strong { color: #d7ff56; font-size: 17px; }
.hero-offer-line span { position: relative; padding-left: 16px; }
.hero-offer-line span::before { position: absolute; top: .65em; left: 0; width: 5px; height: 5px; border-radius: 50%; background: #7392ff; content: ""; }

.payment-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; max-width: 610px; margin-top: 16px; }
.payment-steps span { min-height: 74px; display: grid; align-content: center; gap: 6px; padding: 12px; border: 1px solid rgba(255,255,255,.2); border-radius: 8px; background: rgba(255,255,255,.07); color: #eef2ff; font-size: 12px; line-height: 1.4; }
.payment-steps b { width: 23px; height: 23px; display: grid; place-items: center; border-radius: 50%; background: #d7ff56; color: #17200c; font-size: 11px; }
.register-copy .refund-note { max-width: 610px; margin: 14px 0 0; color: #edf1ff; font-size: 13px; line-height: 1.55; }
.refund-note a { text-decoration: underline; text-underline-offset: 3px; }
.external-cost-note { max-width: 610px; margin: 12px 0 0 !important; padding: 12px 14px; border-left: 3px solid #7392ff; background: rgba(115,146,255,.1); color: #d7dce6 !important; font-size: 13px !important; line-height: 1.55 !important; }

.site-footer .footer-mentoring-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 0 14px;
  border: 1px solid #b7dc2f;
  border-radius: 999px;
  background: #d7ff3f;
  color: #151a11;
  font-size: 14px;
  font-weight: 750;
  white-space: nowrap;
}
.site-footer .footer-mentoring-link:hover {
  border-color: #9fc51b;
  background: #c7ef31;
  color: #121512;
}
.footer-mentoring-link b { font-size: 15px; }

.signup-form label > small { color: #667067; font-size: 12px; font-weight: 500; }
.checkout-trust { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 7px; margin: 0; padding: 0; list-style: none; }
.checkout-trust li { min-width: 0; display: flex; align-items: flex-start; gap: 6px; padding: 9px 8px; border: 1px solid #e0e4da; border-radius: 7px; background: #f7f9f2; color: #596158; font-size: 12px; line-height: 1.35; }
.checkout-trust li > b { flex: 0 0 auto; color: #397000; font-size: 12px; }
.checkout-trust strong { display: block; color: #2f382b; font-size: inherit; }
.checkout-popup-active .checkout-trust { grid-template-columns: 1fr; gap: 5px; }
.checkout-popup-active .checkout-trust li { min-height: 0; align-items: center; padding: 0; border: 0; background: transparent; color: #2d3748; font-size: 12px; }
.checkout-popup-active .checkout-trust li > b { width: 17px; height: 17px; display: grid; place-items: center; border-radius: 50%; background: #d7ff3f; color: #1a365d; font-size: 10px; }
.checkout-popup-active .checkout-trust strong { display: inline; color: #1a365d; }
.form-options { border: 1px solid #dfe1d9; border-radius: 7px; background: #fafaf7; }
.form-options summary { min-height: 48px; display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 0 13px; color: #3d443d; font-size: 14px; font-weight: 650; cursor: pointer; list-style: none; }
.form-options summary small { margin-left: auto; color: #747d73; font-size: 12px; font-weight: 500; }
.form-options summary::-webkit-details-marker { display: none; }
.form-options summary span { color: #3157ff; font-size: 20px; transition: transform .2s ease; }
.form-options[open] summary span { transform: rotate(45deg); }
.form-options > div { display: grid; gap: 16px; padding: 2px 12px 12px; }

@media (max-width: 760px) {
  main > .section:not(.hero) { contain: layout paint; }
  .hero-offer-line { display: grid; justify-content: start; gap: 5px; max-width: 355px; margin: -6px auto 22px; text-align: left; }
  .hero-offer-line strong { margin-bottom: 2px; }
  .payment-steps { grid-template-columns: repeat(2, 1fr); }
  .payment-steps span { min-height: 68px; font-size: 12px; }
  .schedule-note { font-size: 14px; }
  .checkout-trust { gap: 5px; }
  .checkout-trust li { min-height: 64px; display: grid; align-content: start; gap: 3px; padding: 8px 6px; font-size: 12px; }
  body.consent-open .mobile-sticky-cta,
  body.register-in-view .mobile-sticky-cta,
  body.form-focused .mobile-sticky-cta { transform: translateY(100%) !important; }
  body.consent-open .consent-banner { bottom: calc(12px + env(safe-area-inset-bottom)); }
}
.support-rail > i { width: 1px; height: 38px; background: #dbe0ea; }

@keyframes lab-progress { to { transform: scaleX(1); } }
@keyframes lab-fill { 0%, 10% { clip-path: inset(0 100% 0 0); } 48%, 100% { clip-path: inset(0 0 0 0); } }
@keyframes lab-highlight { 0%, 25% { background: #efffd4; box-shadow: none; } 48%, 72% { background: #d7ff56; box-shadow: 0 0 18px rgba(140,190,35,.35); } 100% { background: #efffd4; box-shadow: none; } }
@keyframes lab-citation { 0%, 20% { opacity: .25; transform: translateY(8px); } 45%, 100% { opacity: 1; transform: translateY(0); } }
@keyframes lab-draw { 0%, 12% { stroke-dashoffset: 1300; } 58%, 100% { stroke-dashoffset: 0; } }
@keyframes lab-terminal-line { 0%, 10% { opacity: .2; transform: translateX(-8px); } 42%, 100% { opacity: 1; transform: translateX(0); } }
@keyframes lab-spin { to { transform: rotate(360deg); } }

@keyframes lab-module-enter {
  from { opacity: .78; transform: translateY(16px) scale(.992); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes lab-module-copy-enter {
  from { opacity: .72; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes mobile-module-enter {
  from { opacity: .78; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: no-preference) {
  .lab-shell.is-in-view .lab-scene.is-active .lab-fill { animation: lab-fill 6.5s ease-in-out infinite; }
  .lab-shell.is-in-view .lab-scene.is-active .lab-sheet-grid > strong { animation: lab-highlight 6.5s ease-in-out infinite; }
  .lab-shell.is-in-view .lab-scene.is-active .lab-citations span { animation: lab-citation 6.5s ease-in-out infinite; }
  .lab-shell.is-in-view .lab-scene.is-active .lab-citations span:nth-child(2) { animation-delay: .35s; }
  .lab-shell.is-in-view .lab-scene.is-active .lab-cad > svg path { stroke-dasharray: 1300; animation: lab-draw 6.5s ease-in-out infinite; }
  .lab-shell.is-in-view .lab-scene.is-active .lab-terminal-body code { animation: lab-terminal-line 6.5s ease-in-out infinite; }
  .lab-shell.is-in-view .lab-scene.is-active .lab-pipeline .is-running i { animation: lab-spin 1.1s linear infinite; }
}

@media (max-width: 760px) and (prefers-reduced-motion: no-preference) {
  .lab-shell.is-in-view .lab-scene.is-active .lab-visual {
    animation: lab-module-enter .62s cubic-bezier(.2, .75, .25, 1) both;
  }

  .lab-shell.is-in-view .lab-scene.is-active .lab-copy > * {
    animation: lab-module-copy-enter .52s cubic-bezier(.2, .75, .25, 1) both;
  }

  .lab-shell.is-in-view .lab-scene.is-active .lab-copy > :nth-child(2) { animation-delay: 60ms; }
  .lab-shell.is-in-view .lab-scene.is-active .lab-copy > :nth-child(3) { animation-delay: 110ms; }
  .lab-shell.is-in-view .lab-scene.is-active .lab-copy > :nth-child(4) { animation-delay: 160ms; }

  .motion-mobile .mobile-reveal-item.is-mobile-revealed {
    animation: mobile-module-enter .58s cubic-bezier(.2, .75, .25, 1) both;
    animation-delay: var(--mobile-reveal-delay, 0ms);
  }
}

@media (max-width: 900px) {
  .hero h1 { font-size: 58px; }
  .intent-selector-heading { grid-template-columns: 1fr; gap: 16px; }
  .intent-selector-heading > p { max-width: 680px; }
  .intent-selector-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .intent-course-guide { grid-template-columns: 1fr; }
  .intent-course-guide > span + span { border-top: 1px solid #d9ded5; border-left: 0; }
  .project-file-rail { grid-template-columns: repeat(5, minmax(140px, 1fr)); overflow-x: auto; padding-bottom: 10px; scroll-snap-type: x mandatory; }
  .project-file-rail > span { scroll-snap-align: start; }
  .project-file-rail > i { display: none; }
  .lab-tabs { overflow-x: auto; grid-template-columns: repeat(6, minmax(118px, 1fr)); scroll-snap-type: x mandatory; }
  .lab-tabs button { scroll-snap-align: start; }
  .lab-scene { grid-template-columns: 1fr; min-height: 0; }
  .lab-copy { max-width: 680px; }
  .lab-stage { min-height: 0; }
  .control-flow { grid-template-columns: 1fr; }
  .control-connector { display: none; }
  .control-flow article { min-height: 260px; }
  .infra-flow { grid-template-columns: repeat(2, 1fr); }
  .infra-flow > i { display: none; }
  .sponsor-benefits { grid-template-columns: 1fr; }
  .session-map { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .hero h1 { max-width: 355px; font-size: 42px; line-height: 1.01; }
  .hero-lead { font-size: 16px; line-height: 1.58; }
  .hero-proof strong { font-size: 15px; }
  .hero-proof span { font-size: 10px; }
  .workspace-stage.hero-live-stage { height: 248px; min-height: 248px; grid-template-columns: minmax(92px, .9fr) 50px minmax(104px, 1fr); gap: 7px; padding: 9px; }
  .hero-request { gap: 7px; padding: 9px; }
  .hero-request small { font-size: 6px; }
  .hero-request p { font-size: 8px; }
  .hero-request span { padding: 5px; font-size: 6px; }
  .hero-ai-hub > i { width: 48px; height: 48px; }
  .hero-ai-hub b { width: 38px; height: 38px; gap: 1px; }
  .hero-ai-hub b span { font-size: 6px; }
  .hero-ai-hub b em { font-size: 5px; }
  .hero-ai-hub small { margin-top: 12px; font-size: 5px; }
  .hero-output-stack { gap: 5px; }
  .hero-output { min-height: 45px; grid-template-columns: 27px 1fr; gap: 2px 5px; padding: 6px; }
  .hero-output > b { width: 25px; height: 25px; font-size: 6px; }
  .hero-output em,
  .hero-output-code code,
  .hero-output > strong { font-size: 5px; }
  .project-thread,
  .intent-selector,
  .ai-lab,
  .control-gate,
  .infrastructure,
  .program-v2,
  .proof-section,
  .fit-strip { padding: 72px 16px; }
  .project-file-rail { margin-right: -16px; padding-right: 16px; }
  .project-file-rail > span { min-height: 96px; }
  .project-rule { font-size: 15px; line-height: 1.6; }
  .project-rule i { display: none; }
  .intent-selector-heading { margin-bottom: 24px; }
  .intent-selector-heading h2 { font-size: 32px; line-height: 1.17; }
  .intent-selector-heading > p { font-size: 14px; line-height: 1.6; }
  .intent-selector-grid { gap: 9px; }
  .intent-card { min-height: 238px; padding: 17px; border-radius: 10px; }
  .intent-card > span { font-size: 9px; line-height: 1.35; }
  .intent-card > strong { margin-top: 15px; font-size: 18px; line-height: 1.25; }
  .intent-card > small { margin-top: 9px; font-size: 12px; line-height: 1.5; }
  .intent-card > b { padding-top: 15px; font-size: 11px; }
  .intent-course-guide { margin-top: 12px; }
  .intent-course-guide > span { padding: 13px 15px; font-size: 11px; }
  .intent-course-guide b { font-size: 12px; }
  .lab-shell { margin: 0; border-radius: 12px; }
  .lab-tabs button { min-height: 52px; }
  .lab-mobile-run {
    display: grid;
    gap: 11px;
    padding: 14px 16px 15px;
    border-bottom: 1px solid var(--ai-line);
    background: linear-gradient(90deg, rgba(49, 87, 255, .13), rgba(215, 255, 86, .045));
  }
  .lab-mobile-run-head {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 9px;
    align-items: center;
  }
  .lab-mobile-run-head > span { color: #aebbe0; font-size: 12px; font-weight: 750; white-space: nowrap; }
  .lab-mobile-run-head > strong { overflow: hidden; color: #ffffff; font-size: 13px; line-height: 1.25; text-overflow: ellipsis; white-space: nowrap; }
  .lab-mobile-run-head > i { width: 8px; height: 8px; border-radius: 50%; background: var(--ai-acid); box-shadow: 0 0 15px rgba(215, 255, 86, .7); }
  .lab-mobile-steps { display: grid; grid-template-columns: 24px 1fr 24px 1fr 24px; gap: 8px; align-items: center; }
  .lab-mobile-steps > span {
    width: 24px;
    height: 24px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, .2);
    border-radius: 50%;
    background: #182132;
    color: #94a0b6;
    font-size: 10px;
    font-weight: 800;
  }
  .lab-mobile-steps > b { height: 2px; border-radius: 4px; background: rgba(255, 255, 255, .12); }
  .lab-mobile-steps > span.is-complete,
  .lab-mobile-steps > span.is-active { border-color: var(--ai-acid); background: var(--ai-acid); color: #17200a; }
  .lab-mobile-steps > b.is-complete { background: var(--ai-acid); }
  .lab-mobile-run p { margin: 0; color: #b7c1d1; font-size: 12px; line-height: 1.5; }
  .lab-shell[data-mobile-state="process"] .lab-mobile-run-head > i { background: #7392ff; box-shadow: 0 0 15px rgba(115, 146, 255, .8); }
  .lab-shell[data-mobile-state="review"] .lab-mobile-run-head > i { background: var(--ai-acid); }
  .lab-scene { gap: 28px; padding: 16px; }
  .lab-visual { min-height: 360px; }
  .lab-window-bar { gap: 5px; padding: 0 10px; }
  .lab-window-bar > span { gap: 4px; }
  .lab-window-bar > span i { width: 6px; height: 6px; }
  .lab-window-bar b { font-size: 8px; }
  .lab-window-bar em { font-size: 7px; }
  .lab-copy { padding: 0 4px 16px; }
  .lab-copy h3 { font-size: 29px; }
  .lab-copy > p:not(.lab-kicker) { font-size: 15px; }
  .lab-word-page { min-height: 320px; padding: 24px 20px; }
  .lab-sheet-grid { margin: 10px; }
  .lab-sheet-grid > * { min-height: 34px; font-size: 9px; }
  .lab-sheet-result { margin: 0 10px; }
  .lab-sources { grid-template-columns: 110px 1fr; }
  .lab-source-list { padding: 14px 7px; }
  .lab-source-list > span { grid-template-columns: 1fr; font-size: 8px; }
  .lab-source-list > span b { width: 27px; height: 27px; }
  .lab-source-answer { padding: 18px; }
  .lab-source-answer > p { font-size: 12px; }
  .lab-cad > img { min-height: 360px; }
  .lab-cad-prompt { top: 14px; left: 14px; width: calc(100% - 28px); }
  .lab-cad-command { right: 14px; bottom: 14px; left: 14px; }
  .lab-cad > svg { inset: 100px 22px 90px auto; width: 68%; }
  .lab-terminal-body { padding: 18px; }
  .lab-terminal-body code { font-size: 10px; }
  .lab-git { padding: 14px; }
  .lab-pipeline > span { min-height: 94px; padding: 10px; }
  .lab-footer { grid-template-columns: 1fr; gap: 12px; padding: 14px; }
  .lab-footer > span,
  .lab-progress { display: none; }
  .lab-footer > a { justify-content: center; min-height: 48px; }
  .control-flow article { min-height: 0; padding: 22px; }
  .control-flow h3 { margin-top: 18px; }
  .control-file, .control-rules, .control-sign { margin-top: 16px; }
  .proof-note { align-items: flex-start; flex-direction: column; font-size: 12px; }
  .infra-flow { grid-template-columns: 1fr; gap: 10px; }
  .infra-flow article { min-height: 0; padding: 20px; }
  .infra-flow article b { margin-top: 8px; font-size: 18px; }
  .infra-flow article p { font-size: 15px; }
  .sponsor-benefits { gap: 10px; }
  .sponsor-benefits article { padding: 19px; }
  .sponsor-benefits strong { font-size: 20px; }
  .sponsor-benefits small { font-size: 14px; }
  .ownership-note { align-items: flex-start; flex-direction: column; padding: 16px; }
  .ownership-note span { width: 100%; min-height: 38px; display: flex; align-items: center; font-size: 13px; }
  .infra-cost { font-size: 14px; }
  .session-map { grid-template-columns: 1fr; }
  .session-map > li { min-height: 0; }
  .support-rail { grid-template-columns: 1fr; gap: 12px; }
  .support-rail > i { width: 100%; height: 1px; }
}

@media (max-width: 760px) and (prefers-reduced-motion: no-preference) {
  .lab-shell.is-in-view .lab-mobile-steps > span.is-active { animation: lab-mobile-step 1.15s ease-in-out infinite; }
  .lab-shell.is-in-view[data-mobile-state="process"] .lab-mobile-run-head > i { animation: lab-mobile-pulse .95s ease-in-out infinite; }
}

@keyframes lab-mobile-step { 50% { transform: scale(1.1); } }
@keyframes lab-mobile-pulse { 50% { opacity: .45; transform: scale(.75); } }

@media (prefers-reduced-motion: reduce) {
  .lab-shell *,
  .lab-shell *::before,
  .lab-shell *::after { animation: none !important; transition: none !important; }
}

/* UX pass: noi dung luon day du, nhiet do thi giac cao hon va de doc tren mobile. */
.hero-offer-line {
  justify-content: flex-start;
  margin-right: 0;
  margin-left: 0;
}

@media (min-width: 901px) {
  .pain,
  .project-thread,
  .intent-selector,
  .ai-lab,
  .control-gate,
  .proof-section,
  .fit-strip,
  .program-v2,
  .about,
  .register {
    padding-top: 104px;
    padding-bottom: 104px;
  }
}

/* Khoi chuyen de da co noi dung cao; khong dung gutter 120px cua section chung. */
@media (min-width: 761px) {
  .word-specialist {
    padding-top: 72px;
    padding-bottom: 72px;
  }
}

@media (max-width: 760px) {
  .section,
  .project-thread,
  .ai-lab,
  .control-gate,
  .proof-section,
  .fit-strip,
  .program-v2,
  .about,
  .register {
    padding-top: 52px;
    padding-bottom: 52px;
  }

  .section-heading { margin-bottom: 32px; }
  .section-heading h2 { font-size: 32px; line-height: 1.17; }
  .section-heading .eyebrow { margin-bottom: 14px; }
  .split-heading { gap: 18px; }
  .split-heading > p { font-size: 15px; line-height: 1.6; }

  .hero-shell {
    min-height: 0;
    gap: 24px;
    padding-top: 28px;
    padding-bottom: 32px;
  }
  .hero .eyebrow {
    max-width: 100%;
    margin-bottom: 16px;
    font-size: 11px;
    line-height: 1.35;
  }
  .hero h1 {
    max-width: 358px;
    margin-bottom: 18px;
    font-size: 36px;
    line-height: 1.06;
  }
  .hero-lead {
    max-width: 358px;
    margin-bottom: 18px;
    font-size: 16px;
    line-height: 1.58;
  }
  .hero-offer-line {
    max-width: 358px;
    margin: 0 0 18px;
    padding: 12px 14px;
    border: 1px solid rgba(255, 255, 255, .13);
    border-radius: 10px;
    background: rgba(255, 255, 255, .055);
  }
  .hero-offer-line strong { font-size: 18px; }
  .hero-offer-line span { font-size: 13px; }
  .hero-actions { grid-template-columns: 1fr; }
  .hero .btn {
    min-height: 52px;
    padding: 0 16px;
    font-size: 15px;
  }
  .hero-proof {
    grid-template-columns: 1fr;
    gap: 0;
    margin-top: 20px;
    padding-top: 8px;
  }
  .hero-proof li {
    min-height: 54px;
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 12px;
    align-items: center;
    padding: 10px 0;
  }
  .hero-proof li + li {
    padding-left: 0;
    border-top: 1px solid rgba(255, 255, 255, .1);
    border-left: 0;
  }
  .hero-proof strong { font-size: 14px; }
  .hero-proof span {
    max-width: none;
    margin-top: 0;
    font-size: 13px;
    line-height: 1.4;
  }

  .workspace-stage.hero-live-stage {
    width: auto;
    height: auto;
    min-height: 332px;
    aspect-ratio: auto;
    grid-template-columns: 1fr;
    grid-template-rows: auto 44px auto auto;
    gap: 8px;
    padding: 12px;
  }
  .hero-flow-layer,
  .hero-live-stage::before { display: none; }
  .hero-request {
    gap: 6px;
    padding: 10px 12px;
  }
  .hero-request small { font-size: 8px; }
  .hero-request p { font-size: 11px; line-height: 1.4; }
  .hero-request span { padding: 4px 6px; font-size: 9px; }
  .hero-ai-hub {
    display: flex;
    gap: 12px;
    justify-content: center;
  }
  .hero-ai-hub > i { width: 42px; height: 42px; }
  .hero-ai-hub b { width: 38px; height: 38px; gap: 1px; }
  .hero-ai-hub b span { font-size: 6px; }
  .hero-ai-hub b em { font-size: 5px; }
  .hero-ai-hub small { margin-top: 0; font-size: 8px; }
  .hero-output-stack {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }
  .hero-output {
    min-height: 76px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    justify-content: center;
    padding: 7px 5px;
    text-align: center;
  }
  .hero-output > b {
    width: 31px;
    height: 25px;
    flex: 0 0 auto;
    font-size: 8px;
  }
  .hero-output > strong,
  .hero-output-code code { width: 100%; font-size: 9px; }
  .hero-output em { font-size: 8px; }
  .codex-live {
    position: static;
    width: auto;
    grid-column: 1;
    gap: 5px;
    padding: 9px 10px;
    font-size: 10px;
  }
  .codex-code { display: none; }
  .codex-result { font-size: 10px; }

  .pain .section-heading,
  .pain .section-heading .eyebrow { text-align: left; justify-content: flex-start; }
  .pain-intro { margin-top: 16px; font-size: 15px; }
  .pain-grid { gap: 10px; }
  .pain-card { min-height: 0; padding: 22px; }
  .pain-card > strong { font-size: 23px; line-height: 1.12; }
  .pain-card h3 { margin: 18px 0 9px; font-size: 20px; }
  .pain-card p { font-size: 15px; }

  .project-file-rail { grid-template-columns: repeat(5, minmax(148px, 1fr)); }
  .project-file-rail > span { min-height: 88px; padding: 14px; }
  .project-rule { margin-top: 24px; }

  .lab-tabs { grid-template-columns: repeat(6, minmax(112px, 1fr)); }
  .lab-tabs button { min-height: 50px; font-size: 13px; }
  .lab-scene { gap: 22px; padding: 14px; }
  .lab-copy h3 { margin-bottom: 14px; font-size: 27px; }
  .lab-copy > strong { margin-top: 20px; }

  .control-flow { gap: 10px; }
  .control-flow article { padding: 20px; }
  .control-flow h3 { margin-top: 14px; font-size: 21px; }
  .control-flow p { font-size: 15px; }

  .demo-grid { gap: 12px; }
  .demo-card { min-height: 0; padding: 16px; }
  .demo-card > strong { font-size: 19px; }
  .proof-note { gap: 6px; margin-top: 16px; padding: 14px; font-size: 13px; }

  .fit-strip .audience-list { gap: 8px; }
  .fit-strip .audience-list span {
    width: 100%;
    min-height: 50px;
    padding: 0 14px;
    font-size: 14px;
  }
  .not-for { margin-top: 18px; font-size: 14px; line-height: 1.55; }

  .session-map { gap: 8px; }
  .session-map > li { padding: 14px 16px; }
  /* An mock art de rut chieu cao program tren mobile (P0 UI). */
  .session-map .session-art { display: none; }
  .session-map > li > p { margin: 0 0 6px; font-size: 12px; }
  .session-map h3 { margin: 0 0 6px; font-size: 18px; line-height: 1.25; }
  .session-map small { font-size: 12px; }
  .support-rail { margin-top: 12px; padding: 14px; }
  .support-rail b { font-size: 14px; }
  .support-rail small { font-size: 13px; }

  .about-copy h2 { font-size: 38px; }
  .role { font-size: 16px; line-height: 1.5; }
  .about blockquote { font-size: 17px; }

  .word-specialist,
  .lisp-specialist {
    padding-top: 48px;
    padding-bottom: 48px;
  }
  /* Card chuyen de la lua chon phu; bo mockup trang tri de rut ngan hanh trinh mobile. */
  .word-specialist .specialist-preview { display: none; }

  .register h2 { font-size: 34px; }
  .register-copy > p:not(.eyebrow) { margin-top: 18px; font-size: 16px; }
  .offer-summary { margin-top: 24px; padding: 18px; }
  .offer-summary strong { font-size: 30px; }
  .direct-contact { grid-template-columns: 1fr; }
  .payment-steps span { min-height: 62px; }
  .signup-form,
  .payment-panel { padding: 18px; }

  /* FAQ gon: chi summary, noi dung mo khi can. */
  .faq-list { margin-top: 18px; }
  .faq-list summary { min-height: 48px; font-size: 14px; }
  .faq-list p { margin: 0 0 12px; font-size: 14px; }

  /* Proof cards: giam padding de ngan scroll. */
  .proof-section .demo-grid { gap: 12px; }
  .proof-section .demo-card { min-height: 0; padding: 14px; }
  .proof-section .demo-preview { min-height: 160px; }

  /* Infra: stack gon hon. */
  .infrastructure .infra-flow { gap: 10px; }
  .infrastructure .infra-flow article { padding: 14px; }
  .infrastructure .sponsor-benefits { gap: 8px; }
  .infrastructure .sponsor-benefits article { padding: 14px; }
  .infrastructure .ownership-note { padding: 12px; }
}