.product-hero {
  display: grid;
  grid-template-columns: 1fr 1.04fr;
  align-items: center;
  gap: 30px;
  padding-block: 60px 76px;
}
.product-hero > * { min-width: 0; }
.product-hero h1 {
  font-size: clamp(60px, 6vw, 84px);
  line-height: 1.12;
  letter-spacing: -0.03em;
}
.product-hero h1 em { color: var(--orange); font-style: normal; }
.product-hero-lead { margin-top: 26px; font-size: 21px; font-weight: 800; }
.product-hero-description { margin-top: 10px; color: var(--muted); font-size: 16px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 24px; margin-top: 30px; flex-wrap: wrap; }
.film-link { display: inline-flex; align-items: center; gap: 8px; font-size: 15px; font-weight: 800; min-height: 44px; text-decoration: none; }
.film-link:hover, .hero-founder:hover { color: var(--orange); }
.product-hero-note { font-size: 12px; color: var(--muted); margin-top: 12px; }
.hero-founder { display: inline-flex; gap: 4px; align-items: center; min-height: 44px; margin-top: 32px; font-size: 13px; text-decoration: none; border-bottom: 1px solid var(--line); padding-block: 8px; }
.hero-founder svg { width: 17px; height: 17px; }
.product-hero-stage { position: relative; height: 610px; isolation: isolate; }
.hero-stage-disc { position: absolute; background: var(--mint); border-radius: 50%; width: 540px; height: 540px; max-width: 100%; top: 40px; left: 0; z-index: -1; }
.hero-screen { position: absolute; width: 245px; border: 6px solid var(--ink); border-radius: 18px; overflow: hidden; background: var(--mint); }
.hero-screen img { width: 100%; aspect-ratio: 1 / 2; object-fit: cover; }
.hero-screen-back { left: 10px; top: 52px; transform: rotate(-7deg); }
.hero-screen-front { right: 12px; top: 4px; transform: rotate(5deg); }
.hero-stage-horang { position: absolute; width: 172px; bottom: 34px; right: -8px; filter: drop-shadow(0 8px 8px rgb(35 63 53 / 12%)); }
.hero-stage-caption { position: absolute; bottom: 0; left: 20px; font-family: Jua, sans-serif; font-size: 21px; transform: rotate(-3deg); }
.film-section { background: var(--ink); color: var(--paper); padding-block: 70px 42px; }
.film-heading { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 32px; }
.film-heading h2 { font-size: clamp(33px, 3.5vw, 48px); }
.film-heading p { color: #d1decd; font-size: 16px; }
.film-player { position: relative; background: #172c25; border-radius: 16px; overflow: hidden; }
.film-player video { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: contain; }
.film-cover { position: absolute; inset: 0; width: 100%; background: transparent; color: var(--paper); display: flex; align-items: end; justify-content: center; padding-bottom: 28px; gap: 12px; font-size: 17px; font-weight: 800; }
.film-cover > span:last-child { background: var(--ink); padding: 11px 20px; border-radius: 10px; }
.film-cover small { margin-left: 12px; color: var(--yellow); font-size: 13px; font-variant-numeric: tabular-nums; }
.film-play-symbol { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 50%; background: var(--orange); transition: transform 180ms var(--ease), background 180ms; }
.film-cover:hover .film-play-symbol { transform: scale(1.1); background: #a33416; }
.film-player.is-started .film-cover { display: none; }
.film-cover:focus-visible { outline-offset: -5px; }
.film-chapters { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 26px; }
.film-chapters button { background: transparent; border-top: 1px solid #708a78; color: var(--paper); text-align: left; padding: 14px 0 8px; min-height: 52px; font-size: 15px; font-weight: 750; transition: color 180ms, border-color 180ms; }
.film-chapters button span { display: block; color: #bbceb8; font-size: 12px; font-variant-numeric: tabular-nums; margin-bottom: 5px; }
.film-chapters button:hover, .film-chapters button.is-current { color: var(--yellow); border-color: var(--yellow); }
.film-note { margin-top: 24px; max-width: 80ch; font-size: 12px; line-height: 1.7; color: #c2d3be; }
.film-status { font-size: 14px; color: var(--yellow); }
.showcase-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: center; margin-top: 56px; }
.showcase-visual { background: var(--mint); padding: 35px 36px 24px; border-radius: 16px; display: grid; justify-items: center; }
.showcase-visual > img { width: 280px; height: auto; aspect-ratio: 1 / 2; border-radius: 12px; border: 4px solid var(--ink); }
.showcase-image-note { display: block; font-size: 12px; color: var(--muted); margin-top: 18px; }
.showcase-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; margin-bottom: 32px; }
.showcase-tabs button { background: transparent; padding: 13px 0; min-height: 48px; text-align: left; font-size: 15px; font-weight: 700; color: var(--muted); border-bottom: 1px solid var(--line); }
.showcase-tabs button[aria-selected="true"] { color: var(--orange); border-color: var(--orange); font-weight: 900; }
.showcase-tabs button:hover { color: var(--orange); }
.showcase-copy h3 { font-size: clamp(30px, 3.2vw, 43px); line-height: 1.3; margin-bottom: 22px; }
#showcase-description { line-height: 1.9; color: var(--muted); max-width: 43ch; }
#showcase-benefits { list-style: none; margin: 25px 0; padding: 0; font-size: 15px; }
#showcase-benefits li { display: flex; gap: 12px; margin-block: 9px; }
#showcase-benefits li::before { content: ""; display: block; flex-shrink: 0; width: 14px; height: 8px; border-bottom: 2px solid var(--orange); border-left: 2px solid var(--orange); transform: rotate(-45deg); margin-top: 7px; }
.text-link svg { display: inline-block; vertical-align: middle; margin-left: 5px; width: 20px; height: 20px; }
.external-arrow { display: inline-block; vertical-align: middle; width: 16px; height: 16px; margin-left: 4px; }
.showcase-data { border-top: 1px solid var(--line); padding-top: 22px; margin-top: 30px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.try-section { padding-top: 20px; padding-bottom: 100px; }
.try-section .hero-copy > .text-link { display: inline-block; margin-top: 28px; }
.pricing-section { display: grid; grid-template-columns: 1.1fr 1fr; gap: 80px; align-items: center; border-top: 1px solid var(--line); }
.story-section + .pricing-section { border-top: 0; }
.pricing-message > p { color: var(--muted); margin-top: 26px; line-height: 1.9; }
.pricing-reasons { list-style: none; margin: 34px 0 0; padding: 0; }
.pricing-reasons li { display: flex; align-items: baseline; gap: 20px; padding-block: 16px; border-bottom: 1px solid var(--line); }
.pricing-reasons strong { min-width: 108px; font-weight: 850; }
.pricing-reasons span { color: var(--muted); font-size: 15px; }
.price-offer { padding: 44px 38px 36px; background: var(--yellow); border-radius: 16px; }
.price-offer h3 { font-size: 27px; }
.price-amount { font-size: clamp(58px, 5.5vw, 76px); line-height: 1.15; font-weight: 900; letter-spacing: -0.035em; margin-top: 24px; font-variant-numeric: tabular-nums; }
.price-amount span { font-size: 28px; font-weight: 750; margin-left: 8px; }
.price-model { font-size: 13px; margin-top: 8px; }
.price-promise { font-size: 18px; font-weight: 750; line-height: 1.7; margin-block: 26px; }
.price-now { font-size: 15px; line-height: 1.6; margin: -10px 0 16px; padding-top: 14px; border-top: 1px dashed rgb(35 63 53 / 35%); }
.price-offer .button { width: 100%; padding-inline: 15px; }
.price-note { font-size: 12px; line-height: 1.8; margin-top: 18px; color: #4b5137; }
.hero-price { display: flex; width: fit-content; align-items: center; gap: 6px; min-height: 44px; font-size: 13px; color: var(--muted); text-decoration: none; border-bottom: 1px solid var(--line); }
.hero-price strong { color: var(--ink); }
.hero-founder { margin-top: 12px; }
.hero-screen { border-width: 3px; border-radius: 17px; box-shadow: 0 8px 12px rgb(35 63 53 / 6%), 0 22px 40px rgb(35 63 53 / 10%); }
.hero-screen img { border-radius: 13px; }
.showcase-visual > img { border-radius: 16px; }
.screen-enlarge { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: 13px; font-weight: 750; text-underline-offset: 4px; }
.screen-enlarge:hover, .hero-price:hover { color: var(--orange); }
.film-play-symbol svg { transform: translateX(1px); }
.film-cover:active .film-play-symbol { transform: scale(.96); }
.start-section { border-top: 1px solid var(--line); }
.start-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px; list-style: none; padding: 0; margin: 48px 0 34px; }
.start-steps li { border-top: 1px solid var(--line); padding-top: 22px; }
.step-number { font-family: Jua, sans-serif; color: var(--orange); font-size: 30px; }
.start-steps h3 { margin-block: 14px 12px; font-size: 25px; }
.start-steps p { color: var(--muted); font-size: 15px; line-height: 1.8; }
.start-footer { display: flex; align-items: center; gap: 28px; padding-top: 20px; }
.start-footer p { font-size: 13px; color: var(--muted); line-height: 1.8; }
.start-footer p a { display: inline-flex; align-items: center; min-height: 44px; text-underline-offset: 3px; }
.deep-dive { padding-bottom: 68px; }
.deep-heading { margin-bottom: 32px; }
.deep-heading h2 { font-size: clamp(32px, 3.5vw, 44px); }
.deep-heading p { margin-top: 12px; color: var(--muted); }
.deep-details { border-block-start: 1px solid var(--line); }
.deep-details:last-child { border-block-end: 1px solid var(--line); }
.deep-details > summary { display: flex; align-items: center; justify-content: space-between; gap: 24px; cursor: pointer; list-style: none; padding-block: 26px; }
.deep-details > summary::-webkit-details-marker { display: none; }
.deep-details summary strong { display: block; font-size: 20px; }
.deep-details summary small { display: block; color: var(--muted); margin-top: 7px; font-size: 14px; }
.deep-details > summary > svg { flex-shrink: 0; width: 24px; height: 24px; transition: transform 180ms var(--ease); }
.deep-details[open] > summary > svg { transform: rotate(45deg); }
.deep-details > summary:hover strong { color: var(--orange); }
.deep-body .exam-section { margin-bottom: 60px; }
@media (max-width: 800px) {
  .start-steps { gap: 20px; }
  .start-steps h3 { font-size: 22px; }
  .start-footer { align-items: flex-start; flex-direction: column; gap: 16px; }
}
@media (max-width: 560px) {
  .start-steps { grid-template-columns: 1fr; margin-top: 32px; gap: 22px; }
  .start-steps li { display: grid; grid-template-columns: 44px 1fr; gap: 0 12px; }
  .step-number { grid-row: span 2; line-height: 1.4; }
  .start-steps h3 { margin-block: 0 8px; }
  .start-steps p { grid-column: 2; }
  .start-footer { padding-top: 0; }
  .deep-details summary strong { font-size: 17px; }
  .deep-details summary small { font-size: 12px; line-height: 1.7; }
  .hero-price { font-size: 12px; }
  .deep-dive { padding-bottom: 44px; }
}
@media (min-width: 801px) and (max-width: 1100px) {
  .product-hero { gap: 10px; }
  .product-hero h1 { font-size: 62px; }
  .product-hero-stage { height: 550px; }
  .hero-screen { width: 205px; }
  .hero-screen-back { left: 0; top: 72px; }
  .hero-screen-front { right: 0; top: 20px; }
  .hero-stage-horang { width: 130px; }
  .hero-stage-disc { height: 450px; }
  .showcase-layout, .pricing-section { gap: 40px; }
  .showcase-visual { padding-inline: 24px; }
  .hero-actions { gap: 10px; }
  .hero-actions .button { padding-inline: 17px; }
}
@media (max-width: 800px) {
  .product-hero { grid-template-columns: minmax(0, 1fr); padding-block: 44px 42px; gap: 32px; }
  .product-hero h1 { font-size: clamp(55px, 10vw, 76px); }
  .product-hero h1 br:nth-child(2) { display: none; }
  .product-hero-stage { width: 510px; max-width: 100%; margin-inline: auto; height: 540px; }
  .hero-screen { width: 230px; }
  .hero-stage-disc { height: 470px; }
  .hero-screen-front { right: 18px; }
  .hero-stage-horang { width: 150px; bottom: 22px; }
  .film-section { padding-block: 48px 30px; }
  .film-heading { display: block; }
  .film-heading p { margin-top: 16px; }
  .showcase-layout { gap: 32px; grid-template-columns: .9fr 1.1fr; }
  .showcase-visual { padding: 20px 18px; }
  .showcase-copy h3 { font-size: 31px; }
  .showcase-tabs { gap: 0 10px; }
  .showcase-tabs button { font-size: 13px; }
  .showcase-copy p { font-size: 15px; }
  .showcase-copy .showcase-data { font-size: 12px; }
  .pricing-section { gap: 32px; grid-template-columns: 1fr; }
  .price-offer { max-width: 530px; width: 100%; }
}
@media (max-width: 560px) {
  .product-hero { padding-top: 30px; gap: 34px; }
  .product-hero h1 { font-size: 54px; line-height: 1.13; }
  .product-hero h1 br:nth-child(2) { display: block; }
  .product-hero-lead { font-size: 18px; margin-top: 21px; }
  .product-hero-description { font-size: 14px; }
  .product-hero-description br { display: none; }
  .hero-actions { gap: 8px 16px; margin-top: 22px; }
  .hero-actions .button { font-size: 15px; padding: 12px 17px; min-height: 52px; }
  .film-link { font-size: 14px; gap: 4px; }
  .film-link svg { width: 20px; height: 20px; }
  .product-hero-note { font-size: 12px; }
  .hero-founder { margin-top: 16px; font-size: 12px; }
  .product-hero-stage { height: 410px; }
  .hero-screen { width: 48%; border-width: 4px; border-radius: 14px; }
  .hero-screen-back { left: 7px; top: 28px; }
  .hero-screen-front { right: 8px; top: 0; }
  .hero-stage-disc { top: 30px; height: 330px; }
  .hero-stage-horang { width: 112px; bottom: 16px; right: 0; }
  .hero-stage-caption { font-size: 18px; left: 0; bottom: 0; }
  .film-heading h2 { font-size: 32px; }
  .film-heading p { font-size: 14px; }
  .film-player { max-width: 410px; margin-inline: auto; }
  .film-player video { aspect-ratio: 9 / 16; }
  .film-cover { padding-bottom: 20px; font-size: 14px; gap: 8px; }
  .film-cover > span:last-child { padding: 9px 12px; }
  .film-play-symbol { width: 44px; height: 44px; }
  .film-chapters { grid-template-columns: 1fr 1fr; gap: 10px 20px; margin-top: 22px; }
  .film-chapters button { font-size: 13px; }
  .film-chapters button span { margin-bottom: 2px; }
  .film-note { font-size: 11px; }
  .showcase-layout { grid-template-columns: 1fr; margin-top: 30px; gap: 30px; }
  .showcase-copy { display: contents; }
  .showcase-tabs { grid-row: 1; }
  .showcase-visual { grid-row: 2; width: 100%; padding: 26px; }
  .showcase-visual > img { width: 250px; }
  .showcase-tabs { grid-template-columns: repeat(2, 1fr); margin-bottom: 25px; }
  .showcase-tabs button { font-size: 14px; }
  .showcase-copy h3 { font-size: 32px; }
  #showcase-description { min-height: 114px; }
  .showcase-data { margin-top: 24px; }
  .try-section { padding-bottom: 65px; padding-top: 0; }
  .try-section .hero-copy { margin-bottom: 15px; }
  .price-offer { padding: 30px 24px; }
  .price-offer h3 { font-size: 25px; }
  .price-amount { font-size: 63px; }
  .pricing-message > p { font-size: 15px; }
  .pricing-reasons li { gap: 10px; }
  .pricing-reasons strong { min-width: 99px; font-size: 15px; }
  .pricing-reasons span { font-size: 13px; }
}
@media (max-width: 360px) {
  .product-hero h1 { font-size: 48px; }
  .product-hero-stage { height: 355px; }
  .hero-stage-disc { height: 285px; }
  .hero-stage-horang { width: 90px; bottom: 12px; }
  .hero-stage-caption { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .film-play-symbol, .deep-details > summary > svg { transition: none; }
  .film-cover:hover .film-play-symbol { transform: none; }
}
@media print {
  .film-section, .hero-actions, .hero-stage-horang { display: none; }
  .product-hero, .showcase-layout, .pricing-section { break-inside: avoid; }
}

/* 익힘 도장판: 시간에 따라 칸이 켜지고 흐려지는 원리를 보여 준다. */
.brand img, .closing-lockup img { outline: 1px solid rgba(0, 0, 0, 0.1); outline-offset: -1px; }
.mastery-section { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr); gap: 84px; align-items: center; }
.mastery-lead { color: var(--muted); margin-top: 26px; }
.mastery-steps { display: grid; margin-top: 40px; border-top: 1px solid var(--line); }
.mastery-steps button { position: relative; display: grid; grid-template-columns: 172px minmax(0, 1fr); gap: 20px; align-items: baseline; padding: 20px 8px 20px 0; border-bottom: 1px solid var(--line); background: none; color: var(--muted); text-align: left; transition: padding-left 260ms var(--ease), color 180ms; }
.mastery-steps button::before { content: ""; position: absolute; left: 0; top: 33px; width: 9px; height: 9px; border-radius: 50%; background: var(--orange); opacity: 0; transform: scale(0.25); transition: opacity 180ms, transform 260ms var(--ease); }
.mastery-steps strong { font-family: Jua, SUIT, sans-serif; font-size: 22px; font-weight: 400; line-height: 1.3; color: var(--ink); }
.mastery-steps span { font-size: 15px; line-height: 1.75; }
.mastery-steps button:hover strong { color: var(--orange); }
.mastery-steps button[aria-pressed="true"] { padding-left: 22px; color: var(--ink); }
.mastery-steps button[aria-pressed="true"]::before { opacity: 1; transform: scale(1); }
.mastery-steps button[aria-pressed="true"] strong { color: var(--orange); }
.mastery-copy > .text-link { display: inline-block; margin-top: 28px; }
.stamp-card { position: relative; padding: 36px 36px 24px; border: 1px solid var(--line); border-radius: 16px; background: var(--white); rotate: 1.4deg; box-shadow: 0 1px 2px rgba(35, 63, 53, 0.06), 0 22px 44px -22px rgba(35, 63, 53, 0.34); }
.stamp-card::before { content: ""; position: absolute; top: -13px; left: 50%; width: 112px; height: 26px; translate: -50% 0; rotate: -2.5deg; background: rgba(247, 214, 129, 0.82); }
.stamp-card-head { display: flex; align-items: center; gap: 24px; padding-bottom: 26px; border-bottom: 1px dashed #b9bcab; }
.stamp-hanja { font-family: "Songti SC", "Noto Serif CJK KR", Batang, serif; font-size: 104px; line-height: 1; }
.stamp-card-head strong { display: block; font-family: Jua, SUIT, sans-serif; font-size: 28px; font-weight: 400; line-height: 1.3; }
#mastery-status { display: block; margin-top: 6px; color: var(--muted); font-size: 15px; line-height: 1.6; }
.stamp-cells { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin: 30px 0 0; padding: 0; list-style: none; text-align: center; }
.stamp-cells strong { display: block; margin-top: 14px; font-size: 16px; font-weight: 800; line-height: 1.4; }
.stamp-cells small { display: block; color: var(--muted); font-size: 13px; line-height: 1.6; }
.stamp-slot { display: grid; place-items: center; aspect-ratio: 1; border: 2px dashed #b9bcab; border-radius: 50%; transition: border-color 220ms; }
.stamp-slot i { grid-area: 1 / 1; font-style: normal; transition: opacity 220ms, scale 460ms var(--ease), filter 220ms; }
.stamp-on { display: grid; place-items: center; width: calc(100% + 4px); height: calc(100% + 4px); border: 3px solid var(--orange); border-radius: 50%; box-shadow: inset 0 0 0 3px var(--white), inset 0 0 0 4.5px var(--orange); background: var(--white); color: var(--orange); font-family: Jua, SUIT, sans-serif; font-size: clamp(17px, 1.7vw, 23px); rotate: -9deg; }
.stamp-cells li:nth-child(2) .stamp-on { rotate: 6deg; }
.stamp-cells li:nth-child(3) .stamp-on { rotate: -4deg; }
.stamp-cells li:nth-child(4) .stamp-on { rotate: 10deg; }
.stamp-wait, .stamp-recheck { font-size: 12px; font-weight: 800; line-height: 1.3; color: var(--muted); opacity: 0; }
.stamp-recheck { padding: 4px 8px; border-radius: 6px; background: var(--yellow); color: var(--ink); scale: 0.9; white-space: nowrap; }
.stamp-card[data-state="today"] .stamp-on { opacity: 0; scale: 1.5; filter: blur(4px); }
.stamp-card[data-state="today"] .stamp-wait { opacity: 1; }
.stamp-card[data-state="lit"] .stamp-slot, .stamp-card[data-state="fade"] .stamp-slot { border-color: transparent; }
.stamp-card[data-state="lit"] li:nth-child(2) .stamp-on { transition-delay: 90ms; }
.stamp-card[data-state="lit"] li:nth-child(3) .stamp-on { transition-delay: 180ms; }
.stamp-card[data-state="lit"] li:nth-child(4) .stamp-on { transition-delay: 270ms; }
.stamp-card[data-state="fade"] .stamp-on { opacity: 0.3; }
.stamp-card[data-state="fade"] .stamp-recheck { opacity: 1; scale: 1; }
.stamp-card figcaption { margin-top: 26px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.7; }
.closing-lockup { display: flex; align-items: center; gap: 14px; margin: 0 0 22px; }
.closing-lockup img { border-radius: 15px; }
.closing-lockup span { text-align: left; font-family: Jua, SUIT, sans-serif; font-size: 24px; line-height: 1.2; }
.closing-lockup small { display: block; margin-top: 4px; font-family: SUIT, sans-serif; font-size: 13px; font-weight: 600; color: var(--muted); }
@media (max-width: 960px) {
  /* 좁은 화면에서는 단계 버튼 바로 위에 도장판을 두어 눌렀을 때 변화가 보이게 한다. */
  .mastery-section { grid-template-columns: 1fr; gap: 0; }
  .mastery-copy { display: contents; }
  .stamp-card { order: 1; max-width: 560px; width: 100%; justify-self: center; margin-block: 52px 12px; rotate: 0.8deg; }
  .mastery-steps { order: 2; }
  .mastery-copy > .text-link { order: 3; justify-self: start; }
}
@media (max-width: 560px) {
  .mastery-steps button { grid-template-columns: 1fr; gap: 6px; padding-block: 18px; }
  .mastery-steps button::before { top: 28px; }
  .stamp-card { padding: 30px 20px 18px; }
  .stamp-card-head { gap: 16px; padding-bottom: 20px; }
  .stamp-hanja { font-size: 76px; }
  .stamp-card-head strong { font-size: 24px; }
  .stamp-cells { gap: 8px; margin-top: 24px; }
  .stamp-cells strong { font-size: 14px; }
  .stamp-on { font-size: 16px; border-width: 2px; box-shadow: inset 0 0 0 2px var(--white), inset 0 0 0 3px var(--orange); }
  .stamp-wait, .stamp-recheck { font-size: 10px; }
  .stamp-recheck { padding: 3px 5px; }
  .closing-lockup { justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  .mastery-steps button, .mastery-steps button::before, .stamp-slot, .stamp-slot i { transition: none; }
}

/* FSRS 설명: 망각곡선 그림과 실제 앱의 자신감 선택 화면. 기억 구간(먹빛 바탕) 안에 놓인다. */
.fsrs-block { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); gap: 64px; align-items: start; margin-top: 88px; padding-top: 64px; border-top: 1px solid #738779; }
.fsrs-figure svg { width: 100%; height: auto; display: block; font-family: SUIT, sans-serif; }
.fsrs-figure .axis { stroke: #8fae9c; stroke-width: 2; }
.fsrs-figure .lab { fill: #d5dfcf; font-size: 15px; }
.fsrs-figure .target { stroke: var(--yellow); stroke-width: 2; stroke-dasharray: 6 8; }
.fsrs-figure .target-lab { fill: var(--yellow); font-weight: 700; }
.fsrs-figure .curve { fill: none; stroke: var(--paper); stroke-width: 4; stroke-linecap: round; }
.fsrs-figure .curve.ghost { stroke: #8fae9c; stroke-width: 2.5; stroke-dasharray: 5 7; }
.fsrs-figure .ghost-lab { fill: #a9bfb2; }
.fsrs-figure .reviews line { stroke: var(--orange-bright); stroke-width: 3; }
.fsrs-figure .reviews circle { fill: var(--orange-bright); }
.fsrs-figure .reviews text { fill: var(--orange-bright); font-size: 14px; font-weight: 800; }
.fsrs-figure .reviews .gap { fill: var(--paper); font-weight: 600; font-size: 14px; }
.fsrs-figure figcaption { margin-top: 14px; font-size: 13px; color: #c6d5c2; }
.fsrs-copy h3 { font-size: clamp(26px, 2.6vw, 34px); }
.fsrs-copy > p { margin-top: 18px; color: #d5dfcf; font-size: 17px; line-height: 1.8; }
.fsrs-copy > p strong, .fsrs-app strong { color: var(--paper); }
.fsrs-terms { margin: 26px 0 0; }
.fsrs-terms > div { display: grid; grid-template-columns: 118px 1fr; gap: 14px; padding-block: 12px; border-top: 1px solid #52685c; }
.fsrs-terms dt { font-family: Jua, SUIT, sans-serif; font-size: 20px; color: var(--yellow); }
.fsrs-terms dd { margin: 0; color: #d5dfcf; font-size: 15px; line-height: 1.7; }
.fsrs-app { display: grid; grid-template-columns: 150px 1fr; gap: 22px; align-items: center; margin-top: 30px; padding: 20px; border-radius: 16px; background: rgba(255, 249, 237, 0.07); }
.fsrs-app img { width: 150px; height: 300px; object-fit: cover; object-position: 50% 100%; border-radius: 12px; outline: 1px solid rgba(255, 255, 255, 0.12); outline-offset: -1px; }
.fsrs-app p { color: #d5dfcf; font-size: 15px; line-height: 1.75; }
@media (max-width: 960px) {
  .fsrs-block { grid-template-columns: 1fr; gap: 40px; margin-top: 64px; padding-top: 48px; }
}
@media (max-width: 560px) {
  .fsrs-figure .lab, .fsrs-figure .reviews text { font-size: 18px; }
  .fsrs-terms > div { grid-template-columns: 1fr; gap: 4px; }
  .fsrs-app { grid-template-columns: 1fr; }
  .fsrs-app img { width: 100%; max-width: 240px; height: auto; aspect-ratio: 1 / 1; justify-self: center; }
}
.hero-proof { display: flex; flex-wrap: wrap; gap: 8px 0; margin: 22px 0 0; padding: 0; list-style: none; font-size: 14px; color: var(--muted); }
.hero-proof li { display: flex; align-items: center; }
.hero-proof li + li::before { content: ""; width: 4px; height: 4px; margin-inline: 12px; border-radius: 50%; background: var(--orange); }
.hero-proof strong { color: var(--ink); margin-right: 4px; }
.real-app-card { width: 250px; }
.real-app-card img { border-radius: 18px; }

/* 의견 보내기: 왼쪽 안내, 오른쪽 폼. 보내기는 사용자의 메일 앱으로 넘긴다. */
.feedback-section {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 85px;
  align-items: start;
}
.feedback-section > div > p {
  margin-top: 18px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}
.feedback-section > div a {
  font-weight: 700;
}
.feedback-form {
  display: grid;
  gap: 18px;
  padding: 28px;
  border-radius: 20px;
  background: var(--white);
  box-shadow:
    0 1px 2px #23403518,
    0 10px 30px #4b281210;
}
.feedback-row {
  display: grid;
  gap: 8px;
}
.feedback-row label {
  font-weight: 750;
  font-size: 15px;
}
.feedback-row label small {
  font-weight: 500;
  color: var(--muted);
}
.feedback-row input,
.feedback-row select,
.feedback-row textarea {
  font: inherit;
  font-size: 16px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 13px 15px;
  min-height: 50px;
  width: 100%;
  transition: border-color 160ms, box-shadow 160ms;
}
.feedback-row textarea {
  resize: vertical;
  line-height: 1.6;
}
.feedback-row :is(input, select, textarea):focus-visible {
  outline: none;
  border-color: var(--orange);
  box-shadow: 0 0 0 3px #ec653933;
}
.feedback-row :is(input, textarea)::placeholder {
  color: #7d887f;
}
.feedback-row :is(input, textarea):user-invalid {
  border-color: var(--orange);
}
.feedback-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 4px;
}
.feedback-actions .button {
  border: 0;
  cursor: pointer;
}
.feedback-status {
  font-size: 14px;
  color: var(--muted);
}
.feedback-status:empty {
  display: none;
}
@media (max-width: 900px) {
  .feedback-section {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .feedback-form {
    padding: 20px;
    border-radius: 16px;
  }
}