.shell {
  width: min(calc(100% - 40px), var(--max));
    margin: 0 auto;
}

.hero {
  display: grid;
    min-height: min(860px, calc(100svh - 64px));
    grid-template-columns: minmax(0, 1.05fr) minmax(400px, 0.95fr);
    align-items: center;
    gap: clamp(52px, 7vw, 108px);
    padding: clamp(76px, 10vw, 132px) 0 92px;
}

.hero-copy {
  max-width: 670px;
}

.eyebrow,
.section-kicker {
  margin: 0;
    color: var(--accent-ink);
    font-size: 12px;
    font-weight: 680;
    letter-spacing: 0.065em;
    text-transform: uppercase;
}

.hero h1 {
  max-width: 660px;
    margin: 22px 0 0;
    font-size: clamp(52px, 6.4vw, 88px);
    font-weight: 640;
    letter-spacing: -0.042em;
    line-height: 1;
}

.hero-lead {
  max-width: 610px;
    margin: 30px 0 0;
    color: var(--soft);
    font-size: clamp(18px, 2vw, 22px);
    line-height: 1.52;
}

.hero-actions {
  display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 36px;
}

.button {
  display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    gap: 9px;
    border: 0;
    border-radius: var(--radius-sm);
    padding: 0 20px;
    font-size: 14px;
    font-weight: 620;
    text-decoration: none;
    cursor: pointer;
    transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--ink);
    color: var(--canvas);
}

.button-secondary {
  background: transparent;
    color: var(--soft);
}

.hero-domains {
  display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    margin-top: 34px;
    color: var(--faint);
    font-size: 13px;
}

.hero-domains span {
  position: relative;
}

.hero-domains span + span::before {
  position: absolute;
    top: 50%;
    left: -11px;
    width: 3px;
    height: 3px;
    transform: translateY(-50%);
    border-radius: 50%;
    background: var(--accent);
    content: "";
}

.phone-stage {
  position: relative;
    display: grid;
    min-height: 720px;
    place-items: center;
    border-radius: var(--radius-lg);
    background: var(--accent-soft);
    overflow: hidden;
    animation: hero-stage-enter 760ms 100ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes hero-stage-enter {
  from { opacity: 0; transform: translateY(26px) scale(0.975); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.phone-stage::before {
  position: absolute;
    width: 360px;
    height: 360px;
    border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
    border-radius: 50%;
    content: "";
}

.phone-caption {
  position: absolute;
    z-index: 3;
    right: 28px;
    bottom: 24px;
    left: 28px;
    display: flex;
    justify-content: space-between;
    gap: 18px;
    color: var(--soft);
    font-size: 11px;
}

.phone-caption strong {
  color: var(--ink);
    font-weight: 620;
}

.iphone {
  position: relative;
    z-index: 2;
    width: min(338px, 74vw);
    aspect-ratio: 78 / 163.4;
    border: 1px solid #656067;
    border-radius: 55px;
    background: linear-gradient(145deg, #8b878d 0%, #2b292d 18%, #0c0b0d 50%, #5d595f 84%, #a29da4 100%);
    box-shadow: var(--shadow-phone);
    padding: 9px;
}

.iphone::before,
.iphone::after {
  position: absolute;
    left: -4px;
    width: 4px;
    border-radius: 3px 0 0 3px;
    background: #343136;
    content: "";
}

.iphone::before {
  top: 116px;
    height: 82px;
}

.iphone::after {
  top: 218px;
    height: 52px;
}

.iphone-side {
  position: absolute;
    top: 168px;
    right: -4px;
    width: 4px;
    height: 104px;
    border-radius: 0 3px 3px 0;
    background: #343136;
}

.iphone-screen {
  position: relative;
    width: 100%;
    height: 100%;
    border-radius: 47px;
    background: #ffffff;
    overflow: hidden;
}

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

.dynamic-island {
  position: absolute;
    z-index: 5;
    top: 14px;
    left: 50%;
    width: 94px;
    height: 28px;
    transform: translateX(-50%);
    border-radius: 999px;
    background: #050506;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.home-indicator {
  position: absolute;
    z-index: 5;
    bottom: 9px;
    left: 50%;
    width: 112px;
    height: 4px;
    transform: translateX(-50%);
    border-radius: 999px;
    background: rgba(17, 15, 18, 0.78);
}

.section {
  padding: clamp(84px, 9vw, 124px) 0;
}

.section-heading {
  display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.55fr);
    align-items: end;
    gap: 64px;
    margin-bottom: 56px;
}

.section-heading h2,
.source-copy h2,
.plans-heading h2,
.closing h2 {
  max-width: 760px;
    margin: 16px 0 0;
    font-size: clamp(40px, 4.6vw, 56px);
    font-weight: 630;
    letter-spacing: -0.038em;
    line-height: 1.03;
}

.section-heading > p,
.source-copy > p,
.plans-heading > p {
  margin: 0;
    color: var(--soft);
    font-size: 17px;
    line-height: 1.6;
}

.showcase {
  display: grid;
    grid-template-columns: minmax(260px, 0.65fr) minmax(420px, 1.35fr);
    gap: clamp(42px, 7vw, 96px);
    align-items: center;
}

.showcase-copy {
  align-self: stretch;
    display: grid;
    align-content: center;
}

.showcase-tabs {
  display: grid;
    border-top: 1px solid var(--line);
}

.showcase-tab {
  display: grid;
    grid-template-columns: 34px 1fr auto;
    align-items: center;
    gap: 14px;
    min-height: 82px;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: transparent;
    color: var(--soft);
    padding: 0;
    text-align: left;
    cursor: pointer;
}

.showcase-tab .lucide {
  width: 19px;
    height: 19px;
}

.showcase-tab strong {
  display: block;
    color: var(--ink);
    font-size: 15px;
}

.showcase-tab span {
  display: block;
    margin-top: 3px;
    font-size: 12px;
}

.showcase-tab .tab-arrow {
  width: 18px;
    height: 18px;
    opacity: 0;
    transform: translateX(-6px);
    transition: opacity 160ms ease, transform 160ms ease;
}

.showcase-tab[aria-pressed='true'] {
  color: var(--accent);
}

.showcase-tab[aria-pressed='true'] .tab-arrow {
  opacity: 1;
    transform: translateX(0);
}

.showcase-visual {
  position: relative;
    display: grid;
    min-height: 760px;
    place-items: center;
    border-radius: var(--radius-lg);
    background: var(--surface);
    overflow: hidden;
}

.showcase-visual::before {
  position: absolute;
    top: 8%;
    right: -15%;
    width: 70%;
    height: 70%;
    border: 1px solid var(--line);
    border-radius: 50%;
    content: "";
}

.showcase-visual .iphone {
  width: min(360px, 72vw);
}

.screen-transition {
  animation: screen-enter 280ms ease both;
}

@keyframes screen-enter {
  from { opacity: 0.2; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.reveal-ready [data-reveal] {
  opacity: 0;
    transform: translateY(28px);
    transition: opacity 720ms cubic-bezier(0.22, 1, 0.36, 1), transform 720ms cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal-ready [data-reveal='soft'] {
  transform: translateY(18px);
}

.reveal-ready [data-reveal].is-visible {
  opacity: 1;
    transform: translateY(0);
}

.showcase-note {
  position: absolute;
    z-index: 4;
    right: 28px;
    bottom: 26px;
    left: 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    color: var(--soft);
    font-size: 11px;
}

.showcase-note strong {
  color: var(--ink);
}

.multimodal-section {
  background: var(--canvas);
}

.multimodal-heading {
  max-width: 850px;
    margin: 0 auto 58px;
    text-align: center;
}

.multimodal-heading h2 {
  margin: 16px 0 0;
    font-size: clamp(42px, 5.6vw, 72px);
    font-weight: 630;
    letter-spacing: -0.04em;
    line-height: 1.02;
}

.multimodal-heading > p:last-child {
  max-width: 670px;
    margin: 26px auto 0;
    color: var(--soft);
    font-size: 16px;
    line-height: 1.65;
}

.format-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 58px;
  margin-bottom: 14px;
}

.format-rail {
  display: grid;
    min-width: 0;
    grid-template-columns: repeat(6, minmax(0, 1fr));
}

.format-tab,
.format-pause {
  position: relative;
    min-height: 50px;
    border: 0;
    background: transparent;
    color: var(--faint);
    padding: 0 6px;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
}

.format-tab::before,
.format-tab::after {
  position: absolute;
    top: 0;
    right: 14px;
    left: 14px;
    height: 1px;
    background: var(--line);
    content: "";
}

.format-tab::after {
  height: 2px;
    transform: scaleX(0);
    transform-origin: left;
    background: var(--accent);
}

.format-tab[aria-selected='true'] {
  color: var(--ink);
}

.format-tab[aria-selected='true']::after {
  animation: format-progress 6s linear forwards;
}

.multimodal-spotlight.is-paused .format-tab[aria-selected='true']::after {
  animation-play-state: paused;
}

.format-pause {
  display: grid;
    place-items: center;
    color: var(--ink);
}

.format-pause .play,
.multimodal-spotlight.is-paused .format-pause .pause {
  display: none;
}

.multimodal-spotlight.is-paused .format-pause .play {
  display: block;
}

.format-stage {
  position: relative;
    min-height: 590px;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: var(--surface);
}

.format-slide {
  position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: minmax(330px, 0.7fr) minmax(0, 1.3fr);
    opacity: 0;
    pointer-events: none;
    transition: opacity 560ms ease;
}

.format-slide.is-active {
  z-index: 2;
    opacity: 1;
    pointer-events: auto;
}

.format-copy {
  display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 58px 24px 58px 58px;
}

.format-name {
  color: var(--accent);
    font-size: 11px;
    font-weight: 680;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.format-copy h3 {
  max-width: 405px;
    margin: 18px 0 17px;
    font-size: clamp(36px, 4vw, 53px);
    font-weight: 620;
    letter-spacing: -0.035em;
    line-height: 1.04;
}

.format-copy > p {
  max-width: 380px;
    margin: 0;
    color: var(--soft);
    font-size: 15px;
    line-height: 1.65;
}

.format-source {
  display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: 9px;
    margin-top: 34px;
    border-radius: var(--radius-sm);
    background: var(--canvas);
    padding: 10px 13px;
    color: var(--soft);
    font-size: 11px;
    font-weight: 600;
}

.format-source::before {
  width: 6px;
    height: 6px;
    flex: 0 0 6px;
    border-radius: 50%;
    background: var(--success);
    content: "";
}

.format-source strong {
  color: var(--ink);
}

.format-purpose {
  margin-top: auto;
    color: var(--faint);
    font-size: 11px;
}

.format-purpose strong {
  color: var(--ink);
    font-weight: 600;
}

.format-visual {
  position: relative;
    display: grid;
    min-width: 0;
    place-items: center;
    overflow: hidden;
}

.format-visual::before {
  position: absolute;
    width: 78%;
    aspect-ratio: 1;
    border-radius: 50%;
    background: color-mix(in srgb, var(--accent) 5%, transparent);
    content: "";
}

.format-paper {
  position: relative;
    z-index: 2;
    width: min(72%, 540px);
    background: var(--canvas);
    padding: 38px 42px;
}

.format-paper-meta {
  display: flex;
    justify-content: space-between;
    gap: 20px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 16px;
    color: var(--faint);
    font-size: 10px;
}

.format-paper h4 {
  margin: 30px 0 18px;
    font-family: var(--font-evidence);
    font-size: 27px;
    font-weight: 550;
    letter-spacing: -0.02em;
}

.format-paper p {
  margin: 0;
    color: var(--soft);
    font-family: var(--font-evidence);
    font-size: 16px;
    line-height: 1.84;
}

.format-paper mark {
  background: linear-gradient(transparent 58%, color-mix(in srgb, var(--accent) 22%, transparent) 58%);
    color: inherit;
}

.format-paper-link {
  display: block;
    margin-top: 28px;
    color: var(--accent-ink);
    font-size: 11px;
    font-weight: 600;
}

.format-image,
.format-video {
  position: relative;
    z-index: 2;
    width: min(78%, 620px);
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--deep);
}

.format-image img,
.format-video img {
  width: 100%;
    height: 100%;
    object-fit: cover;
}

.format-image img {
  filter: grayscale(0.28) contrast(1.02);
}

.format-focus {
  position: absolute;
    top: 41%;
    left: 48%;
    width: 96px;
    height: 96px;
    border: 1px solid #ffffff;
    border-radius: 50%;
    box-shadow: 0 0 0 999px rgba(22, 19, 25, 0.2);
}

.format-frame-label {
  position: absolute;
    right: 18px;
    bottom: 17px;
    left: 18px;
    display: flex;
    justify-content: space-between;
    gap: 18px;
    color: rgba(255, 255, 255, 0.86);
    font-size: 9px;
}

.format-video img {
  filter: grayscale(0.7) brightness(0.62);
}

.format-play {
  position: absolute;
    top: 50%;
    left: 50%;
    display: grid;
    width: 58px;
    height: 58px;
    place-items: center;
    transform: translate(-50%, -50%);
    border: 1px solid rgba(255, 255, 255, 0.58);
    border-radius: 50%;
    background: rgba(20, 17, 22, 0.32);
    color: #ffffff;
}

.format-video-line {
  position: absolute;
    right: 20px;
    bottom: 20px;
    left: 20px;
    height: 2px;
    background: rgba(255, 255, 255, 0.25);
}

.format-video-line::before {
  display: block;
    width: 38%;
    height: 100%;
    background: #c7abf3;
    content: "";
}

.format-audio {
  position: relative;
    z-index: 2;
    width: min(74%, 560px);
}

.format-audio-head,
.format-audio-foot {
  display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    font-size: 11px;
}

.format-audio-head {
  border-bottom: 1px solid var(--line);
    padding-bottom: 18px;
}

.format-audio-head span,
.format-audio-foot {
  color: var(--faint);
}

.format-wave {
  display: flex;
    height: 160px;
    align-items: center;
    gap: 5px;
}

.format-wave i {
  width: 3px;
    height: 28%;
    border-radius: 99px;
    background: color-mix(in srgb, var(--accent) 55%, var(--line));
}

.format-wave i:nth-child(3n) {
  height: 64%;
}

.format-wave i:nth-child(5n) {
  height: 84%;
}

.format-wave i:nth-child(7n) {
  height: 47%;
}

.format-audio-foot {
  justify-content: flex-start;
    border-top: 1px solid var(--line);
    padding-top: 18px;
    font-size: 9px;
}

.format-audio-play {
  display: grid;
    width: 36px;
    height: 36px;
    place-items: center;
    border-radius: 50%;
    background: var(--ink);
    color: var(--canvas);
}

.format-diagram {
  position: relative;
    z-index: 2;
    width: min(80%, 620px);
    height: 380px;
}

.format-line {
  position: absolute;
    height: 1px;
    transform-origin: left;
    background: color-mix(in srgb, var(--soft) 55%, transparent);
}

.format-line.is-1 {
  top: 100px; left: 50%; width: 185px; transform: rotate(145deg);
}

.format-line.is-2 {
  top: 100px; left: 50%; width: 112px; transform: rotate(90deg);
}

.format-line.is-3 {
  top: 100px; left: 50%; width: 185px; transform: rotate(35deg);
}

.format-line.is-4 {
  bottom: 105px; left: 16%; width: 230px; transform: rotate(23deg);
}

.format-line.is-5 {
  right: 16%; bottom: 105px; width: 230px; transform: rotate(-23deg); transform-origin: right;
}

.format-node {
  position: absolute;
    display: grid;
    min-width: 145px;
    min-height: 64px;
    place-items: center;
    background: var(--canvas);
    padding: 12px;
    font-size: 10px;
    font-weight: 720;
    text-align: center;
}

.format-node.is-primary {
  background: var(--accent-soft);
    color: var(--accent-ink);
}

.format-node.is-1 {
  top: 16px; left: 50%; transform: translateX(-50%);
}

.format-node.is-2 {
  top: 154px; left: 0;
}

.format-node.is-3 {
  top: 154px; left: 50%; transform: translateX(-50%);
}

.format-node.is-4 {
  top: 154px; right: 0;
}

.format-node.is-5 {
  bottom: 12px; left: 50%; transform: translateX(-50%);
}

.model-instruction {
  position: absolute;
    z-index: 5;
    top: 28px;
    right: 30px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--faint);
    font-size: 9px;
    pointer-events: none;
}

.model-instruction::before {
  width: 12px;
    height: 12px;
    border: 1.5px solid currentColor;
    border-radius: 50%;
    box-shadow: 5px 0 0 -4px var(--surface), 5px 0 0 -2.5px currentColor;
    content: "";
}

.brain-viewer {
  position: absolute;
    z-index: 2;
    inset: 7% 1% 3%;
    width: 98%;
    height: 90%;
    --poster-color: transparent;
    --progress-bar-color: var(--accent);
    --progress-bar-height: 2px;
    background: center / contain no-repeat url('/product/brain-editorial.webp');
    touch-action: pan-y;
}

.brain-viewer.is-loaded {
  background: transparent;
}

.brain-viewer:focus {
  outline: none;
}

.brain-viewer:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 52%, transparent);
    outline-offset: -5px;
}

.brain-viewer::part(default-progress-bar) {
  border-radius: 99px;
}

.model-hotspot {
  display: flex;
    align-items: center;
    gap: 8px;
    border: 0;
    background: transparent;
    color: var(--ink);
    padding: 0;
    font-size: 9px;
    font-weight: 740;
    cursor: pointer;
}

.model-hotspot::before {
  display: grid;
    width: 24px;
    height: 24px;
    flex: 0 0 24px;
    place-items: center;
    border: 2px solid #ffffff;
    border-radius: 50%;
    background: #211b27;
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(30, 23, 35, 0.16);
    content: "+";
}

.model-hotspot span {
  opacity: 0;
    transform: translateX(-4px);
    border-radius: 9px;
    background: color-mix(in srgb, var(--canvas) 96%, transparent);
    padding: 8px 10px;
    box-shadow: 0 8px 24px rgba(32, 25, 38, 0.1);
    white-space: nowrap;
    transition: opacity 180ms ease, transform 180ms ease;
}

.model-hotspot:hover span,
.model-hotspot:focus-visible span,
.model-hotspot[data-open='true'] span {
  opacity: 1;
    transform: translateX(0);
}

.model-attribution {
  position: absolute;
    z-index: 5;
    right: 30px;
    bottom: 26px;
    color: var(--faint);
    font-size: 8px;
    text-decoration: none;
}

.model-attribution:hover {
  color: var(--ink);
}

.format-caption {
  display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 20px 4px 0;
    color: var(--faint);
    font-size: 10px;
}

.format-caption strong {
  color: var(--ink);
}

@keyframes format-progress {
  from { transform: scaleX(0); }
    to { transform: scaleX(1); }
}

.learning-section {
  background: var(--surface);
}

.learning-flow {
  display: grid;
    grid-template-columns: repeat(3, 1fr);
    margin: 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 0;
    list-style: none;
}

.learning-step {
  position: relative;
    min-height: 188px;
    padding: 30px 26px;
}

.learning-step + .learning-step {
  border-left: 1px solid var(--line);
}

.learning-step .lucide {
  margin-bottom: 38px;
    color: var(--accent);
}

.learning-step small {
  display: block;
    margin-bottom: 7px;
    color: var(--faint);
    font-size: 11px;
    font-weight: 680;
    letter-spacing: 0.08em;
}

.learning-step strong {
  display: block;
    font-size: 15px;
}

.learning-step p {
  margin: 7px 0 0;
    color: var(--soft);
    font-size: 13px;
}

.learning-statement {
  display: grid;
    grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
    gap: 64px;
    align-items: start;
    margin-top: 58px;
}

.method-foundations-copy h3 {
  max-width: 390px;
    margin: 15px 0 0;
    font-size: clamp(25px, 3vw, 38px);
    font-weight: 620;
    letter-spacing: -0.028em;
    line-height: 1.12;
}

.method-foundations-copy > p:last-child {
  max-width: 430px;
    margin: 22px 0 0;
    color: var(--soft);
    font-size: 15px;
    line-height: 1.6;
}

.method-principles {
  border-top: 1px solid var(--line);
}

.method-principle {
  display: grid;
    min-height: 86px;
    grid-template-columns: minmax(150px, 0.72fr) minmax(0, 1.28fr);
    align-items: center;
    gap: 28px;
    border-bottom: 1px solid var(--line);
    padding: 18px 0;
}

.method-principle-heading {
  display: grid;
    min-width: 0;
    grid-template-columns: 22px minmax(0, 1fr);
    align-items: center;
    gap: 12px;
}

.method-principle-heading .method-principle-icon {
  width: 22px;
    height: 22px;
    color: var(--accent);
    stroke-width: 2.2;
}

.method-principle strong {
  font-size: 14px;
    font-weight: 620;
    letter-spacing: -0.015em;
}

.method-principle p {
  margin: 0;
    color: var(--soft);
    font-size: 13px;
    line-height: 1.55;
}

.source-band {
  background: var(--deep);
    color: #ffffff;
}

.source-layout {
  display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(500px, 1.15fr);
    gap: clamp(70px, 9vw, 132px);
    align-items: center;
    padding: clamp(88px, 9vw, 120px) 0;
}

.source-copy .section-kicker {
  color: #c7abf3;
}

.source-copy > p {
  margin-top: 28px;
    color: var(--deep-soft);
}

.source-pair {
  display: grid;
    grid-template-columns: repeat(2, 1fr);
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.source-column {
  min-height: 320px;
    padding: 28px;
}

.source-column + .source-column {
  border-left: 1px solid rgba(255, 255, 255, 0.16);
}

.source-column > .lucide {
  width: 24px;
    height: 24px;
    margin-bottom: 36px;
    color: #c7abf3;
}

.source-column h3 {
  margin: 0;
    font-size: 22px;
    letter-spacing: -0.03em;
}

.source-column > p {
  min-height: 56px;
    margin: 10px 0 20px;
    color: var(--deep-soft);
    font-size: 13px;
}

.source-column ul {
  margin: 0;
    padding: 0;
    list-style: none;
}

.source-column li {
  display: flex;
    gap: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 12px 0;
    color: #e8e2eb;
    font-size: 13px;
}

.source-column li .lucide {
  width: 16px;
    height: 16px;
    margin-top: 1px;
    color: #c7abf3;
}

.plans-section {
  background: var(--surface);
}

.plans-heading {
  display: grid;
    grid-template-columns: 1fr auto;
    align-items: end;
    gap: 36px;
    margin-bottom: 54px;
}

.plans-heading > div:first-child > p:last-child {
  max-width: 650px;
    margin: 24px 0 0;
    color: var(--soft);
    font-size: 17px;
}

.billing-toggle {
  display: inline-grid;
    grid-template-columns: auto auto;
    border-radius: calc(var(--radius-sm) - 2px);
    background: var(--surface-strong);
    padding: 4px;
}

.billing-toggle button {
  display: inline-flex;
    min-width: 94px;
    min-height: 40px;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--soft);
    padding: 0 14px;
    font-size: 12px;
    font-weight: 620;
    cursor: pointer;
}

.billing-saving {
  border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-ink);
    padding: 5px 8px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.015em;
    line-height: 1;
    white-space: nowrap;
}

.billing-toggle button[aria-pressed='true'] {
  background: var(--canvas);
    color: var(--ink);
    box-shadow: 0 1px 3px rgba(26, 20, 31, 0.08);
}

.plan-tabs {
  display: none;
}

.plans-grid {
  display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.plan {
  position: relative;
    display: grid;
    min-height: 518px;
    grid-template-rows: auto auto auto 1fr auto;
    padding: 30px 26px 28px;
    container: plan-card / inline-size;
}

.plan + .plan {
  border-left: 1px solid var(--line);
}

.plan.is-featured {
  background: var(--accent-soft);
}

.plan.is-ultra {
  background: var(--deep);
    color: #ffffff;
}

.plan-top {
  display: flex;
    min-height: 30px;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.plan-name {
  margin: 0;
  font-size: 19px;
    font-weight: 620;
    letter-spacing: -0.025em;
}

.plan-badge {
  color: var(--accent-ink);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.plan.is-ultra .plan-badge {
  color: #c7abf3;
}

.plan-price {
  display: flex;
    min-width: 0;
    min-height: 84px;
    align-items: baseline;
    gap: 4px;
    margin-top: 22px;
    flex-wrap: nowrap;
}

.plan-price strong {
  min-width: 0;
    font-size: clamp(35px, 3.1vw, 46px);
    font-weight: 630;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.038em;
    line-height: 1;
    white-space: nowrap;
    transition: opacity 140ms ease, transform 180ms ease;
}

.plan-price strong.is-changing {
  opacity: 0;
    transform: translateY(5px);
}

.plan-price span {
  flex: 0 0 auto;
    color: var(--soft);
    font-size: 11px;
    white-space: nowrap;
}

@container plan-card (max-width: 260px) {
  .plan-price {
      gap: 3px;
    }

    .plan-price strong {
      font-size: 32px;
    }

    .plan-price span {
      font-size: 10px;
    }
}

.plan.is-ultra .plan-price span,
.plan.is-ultra .plan-summary,
.plan.is-ultra li {
  color: var(--deep-soft);
}

.plan-summary {
  min-height: 64px;
    margin: 0 0 24px;
    color: var(--soft);
    font-size: 13px;
}

.plan-billing-note {
  min-height: 18px;
    margin: -14px 0 22px;
    color: var(--soft);
    font-size: 11px;
}

.plan.is-ultra .plan-billing-note {
  color: var(--deep-soft);
}

.plan ul {
  margin: 0;
    padding: 0;
    list-style: none;
}

.plan li {
  display: flex;
    gap: 9px;
    border-top: 1px solid color-mix(in srgb, currentColor 12%, transparent);
    padding: 11px 0;
    color: var(--soft);
    font-size: 12px;
}

.plan li .lucide {
  width: 15px;
    height: 15px;
    margin-top: 1px;
    color: var(--success);
}

.plan-action {
  display: inline-flex;
    min-height: 46px;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 26px;
    border: 1px solid var(--ink);
    border-radius: var(--radius-sm);
    background: var(--ink);
    color: var(--canvas);
    padding: 0 16px;
    font-size: 13px;
    font-weight: 620;
    text-decoration: none;
    transition: transform 160ms ease, background-color 160ms ease, color 160ms ease;
}

.plan.is-featured .plan-action {
  border-color: var(--accent);
    background: var(--accent);
    color: #ffffff;
}

.plan.is-ultra .plan-action {
  border-color: #ffffff;
    background: #ffffff;
    color: var(--deep);
}

.plan-action:hover {
  transform: translateY(-1px);
}

.plan-action .lucide {
  width: 17px;
    height: 17px;
    transition: transform 160ms ease;
}

.plan-action:hover .lucide {
  transform: translate(2px, -2px);
}

.faq-section {
  border-top: 0;
}

.faq-list {
  width: min(100%, 900px);
    margin-left: auto;
    border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  display: grid;
    min-height: 76px;
    grid-template-columns: minmax(0, 1fr) 24px;
    align-items: center;
    gap: 24px;
    color: var(--ink);
    font-size: 17px;
    font-weight: 620;
    letter-spacing: -0.015em;
    cursor: pointer;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary .lucide {
  width: 19px;
    height: 19px;
    color: var(--soft);
    transition: transform 180ms ease, color 160ms ease;
}

.faq-item[open] summary .lucide {
  transform: rotate(45deg);
    color: var(--accent);
}

.faq-answer {
  max-width: 760px;
    margin: 0;
    padding: 10px 52px 26px 0;
    color: var(--soft);
    font-size: 14px;
    line-height: 1.7;
}

.closing {
  display: grid;
    justify-items: center;
    padding: clamp(84px, 9vw, 116px) 20px;
    text-align: center;
}

.closing h2 {
  max-width: 720px;
}

.closing > p {
  max-width: 580px;
    margin: 20px 0 28px;
    color: var(--soft);
    font-size: 17px;
}

@media (max-width: 1040px) {
  .hero {
    grid-template-columns: 1fr 400px;
        gap: 50px;
  }

  .hero h1 {
    font-size: clamp(50px, 6vw, 72px);
  }

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

  .plan:nth-child(3) {
    border-top: 1px solid var(--line);
        border-left: 0;
  }

  .plan:nth-child(4) {
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 820px) {
  .hero,
  .showcase,
  .section-heading,
  .source-layout,
  .plans-heading,
  .learning-statement {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 58px;
  }

  .hero-copy {
    max-width: 700px;
  }

  .phone-stage,
  .showcase-visual {
    min-height: 720px;
  }

  .section-heading,
  .plans-heading {
    align-items: start;
        gap: 24px;
  }

  .showcase-copy {
    order: 2;
  }

  .showcase-visual {
    order: 1;
  }

  .multimodal-heading {
    max-width: 700px;
        margin-left: 0;
        text-align: left;
  }

  .multimodal-heading > p:last-child {
    margin-left: 0;
  }

  .format-stage {
    min-height: 790px;
  }

  .format-slide {
    grid-template-columns: 1fr;
        grid-template-rows: auto minmax(420px, 1fr);
  }

  .format-copy {
    min-height: 350px;
        padding: 40px 28px 28px;
  }

  .format-purpose {
    margin-top: 30px;
  }

  .format-visual {
    min-height: 420px;
  }

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

  .learning-step {
    display: grid;
        min-height: 124px;
        grid-template-columns: 36px 74px 1fr;
        align-items: center;
        gap: 12px;
        padding: 22px 0;
  }

  .learning-step + .learning-step {
    border-top: 1px solid var(--line);
        border-left: 0;
  }

  .learning-step .lucide {
    margin: 0;
  }

  .learning-step small {
    margin: 0;
  }

  .learning-step p {
    margin-top: 4px;
  }

  .source-layout {
    gap: 60px;
  }
}

@media (max-width: 620px) {
  .shell {
    width: min(calc(100% - 32px), var(--max));
  }

  .hero {
    gap: 40px;
        min-height: auto;
        padding: 52px 0 64px;
  }

  .hero h1 {
    margin-top: 18px;
        font-size: clamp(43px, 13.3vw, 59px);
        letter-spacing: -0.035em;
        line-height: 0.99;
  }

  .hero-lead {
    margin-top: 24px;
        font-size: 17px;
  }

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

  .hero-actions .button-secondary {
    min-height: 40px;
        justify-content: flex-start;
        padding: 0;
  }

  .hero-domains {
    display: none;
  }

  .phone-stage {
    min-height: 580px;
        border-radius: var(--radius-lg);
  }

  .phone-caption,
  .showcase-note {
    right: 18px;
        bottom: 16px;
        left: 18px;
  }

  .section {
    padding: 72px 0;
  }

  .section-heading {
    margin-bottom: 46px;
  }

  .section-heading h2,
  .source-copy h2,
  .plans-heading h2,
  .closing h2 {
    font-size: clamp(34px, 10vw, 44px);
        letter-spacing: -0.032em;
  }

  .section-heading > p,
  .source-copy > p,
  .plans-heading > p {
    font-size: 15px;
  }

  .showcase-visual {
    min-height: 610px;
        border-radius: var(--radius-lg);
  }

  .showcase-visual .iphone,
  .phone-stage .iphone {
    width: min(285px, 78vw);
  }

  .showcase-tab {
    grid-template-columns: 30px 1fr auto;
        min-height: 76px;
  }

  .multimodal-heading {
    margin-bottom: 42px;
  }

  .multimodal-heading h2 {
    font-size: clamp(40px, 12vw, 54px);
        letter-spacing: -0.034em;
  }

  .multimodal-heading > p:last-child {
    font-size: 15px;
  }

  .format-controls {
    grid-template-columns: minmax(0, 1fr) 46px;
    margin-right: -16px;
    margin-left: -16px;
    padding-left: 16px;
  }

  .format-rail {
    display: flex;
        min-width: 0;
        padding: 0;
        overflow-x: auto;
        scroll-snap-type: x proximity;
        scrollbar-width: none;
  }

  .format-rail::-webkit-scrollbar {
    display: none;
  }

  .format-tab {
    flex: 0 0 auto;
        min-height: 46px;
        scroll-snap-align: start;
        padding: 0 14px;
        font-size: 11px;
  }

  .format-tab {
    min-width: 78px;
  }

  .format-pause {
    width: 46px;
    min-height: 46px;
  }

  .format-tab::before,
  .format-tab::after {
    right: 14px;
        left: 14px;
  }

  .format-stage {
    min-height: 735px;
        border-radius: 24px;
  }

  .format-slide {
    grid-template-rows: auto minmax(360px, 1fr);
  }

  .format-copy {
    min-height: 350px;
        padding: 32px 22px 25px;
  }

  .format-copy h3 {
    font-size: 37px;
  }

  .format-copy > p {
    font-size: 14px;
  }

  .format-source {
    margin-top: 24px;
  }

  .format-purpose {
    margin-top: 26px;
  }

  .format-visual {
    min-height: 360px;
  }

  .format-paper,
  .format-audio {
    width: 86%;
  }

  .format-image,
  .format-video {
    width: 90%;
  }

  .format-diagram {
    width: 108%;
        transform: scale(0.72);
  }

  .brain-viewer {
    inset: 0;
        width: 100%;
        height: 100%;
  }

  .model-instruction {
    top: 18px;
        right: 20px;
  }

  .model-attribution {
    right: 20px;
        bottom: 18px;
  }

  .model-hotspot span {
    display: none;
  }

  .format-caption {
    align-items: flex-start;
        flex-direction: column;
        gap: 6px;
  }

  .learning-step {
    grid-template-columns: 32px 58px 1fr;
        min-height: 112px;
  }

  .learning-statement {
    gap: 24px;
        margin-top: 46px;
  }

  .method-foundations-copy > p:last-child {
    font-size: 15px;
  }

  .method-principle {
    min-height: auto;
        grid-template-columns: 1fr;
        gap: 9px;
        padding: 16px 0;
  }

  .source-layout {
    gap: 36px;
        padding: 72px 0;
  }

  .source-pair {
    grid-template-columns: 1fr;
  }

  .source-column {
    min-height: auto;
        padding: 28px 0;
  }

  .source-column + .source-column {
    border-top: 1px solid rgba(255, 255, 255, 0.16);
        border-left: 0;
  }

  .source-column > .lucide {
    margin-bottom: 34px;
  }

  .source-column > p {
    min-height: auto;
  }

  .billing-toggle {
    justify-self: start;
  }

  .plan-tabs {
    display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 4px;
        margin-bottom: 18px;
        border-radius: var(--radius-md);
        background: var(--surface-strong);
        padding: 4px;
  }

  .plan-tabs button {
    min-height: 42px;
        border: 0;
        border-radius: var(--radius-sm);
        background: transparent;
        color: var(--soft);
        font-size: 12px;
        font-weight: 620;
        cursor: pointer;
  }

  .plan-tabs button[aria-pressed='true'] {
    background: var(--canvas);
        color: var(--ink);
        box-shadow: 0 1px 3px rgba(26, 20, 31, 0.08);
  }

  .plans-grid {
    display: block;
        border: 0;
  }

  .plan {
    display: none;
        min-height: 470px;
        border: 1px solid var(--line);
        border-radius: var(--radius-md);
        background: var(--canvas);
        padding: 26px 22px;
  }

  .plan.is-mobile-active {
    display: grid;
  }

  .plan + .plan {
    border-left: 1px solid var(--line);
  }

  .plan.is-featured,
  .plan.is-ultra {
    margin: 0;
  }

  .closing {
    padding: 76px 16px;
  }

  .faq-list {
    margin-left: 0;
  }

  .faq-item summary {
    min-height: 70px;
        gap: 18px;
        font-size: 15px;
  }

  .faq-answer {
    padding-right: 36px;
        font-size: 13px;
  }
}

@media (max-width: 370px) {
  .phone-stage,
  .showcase-visual {
    min-height: 620px;
  }

  .showcase-visual .iphone,
  .phone-stage .iphone {
    width: min(286px, 84vw);
  }

  .phone-caption span:last-child,
  .showcase-note span:last-child {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .format-tab[aria-selected='true']::after {
    animation: none;
        transform: scaleX(1);
  }

  .format-slide {
    transition: none;
  }

  .hero-copy > *,
  .phone-stage,
  .phone-stage .iphone,
  .reveal-ready [data-reveal] {
    opacity: 1 !important;
        transform: none !important;
        animation: none !important;
  }
}

@media print {
  .hero-actions,
  .format-pause,
  .billing-toggle,
  .plan-action {
    display: none !important;
  }

  .hero,
  .section,
  .source-layout,
  .closing {
    min-height: auto;
        padding: 34px 0;
        break-inside: avoid;
  }

  .iphone {
    box-shadow: none;
  }
}