:root {
  --brand-green: #1f8f38;
  --brand-green-hi: #8ce44f;
  --brand-green-dk: #146d29;
  --bg-white: #ffffff;
  --bg-cream: #FFF8E7;
  --ink: #132112;
  --muted: #445443;
  --radius-btn: 32px;
  --radius-card: 20px;
  --shell: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg-white);
  font-family: 'Pretendard Variable', 'Pretendard', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  letter-spacing: 0;
  word-break: keep-all;
}

a {
  color: inherit;
}

img,
svg {
  display: block;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 12px 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid rgba(31, 143, 56, 0.08);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar-nav {
  display: flex;
  gap: 16px;
}

.nav-link {
  font-size: 14px;
  font-weight: 650;
  color: var(--ink);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 999px;
  transition: background 0.2s, color 0.2s;
}

.nav-link:hover {
  background: rgba(31, 143, 56, 0.08);
  color: var(--brand-green);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(31, 143, 56, 0.16);
  border-radius: 14px;
  background: #f6fff1;
  box-shadow: 0 10px 22px rgba(31, 143, 56, 0.12);
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-copy strong {
  font-size: 17px;
  line-height: 1.1;
}

.brand-copy span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.2;
}

.section-white {
  background: var(--bg-white);
}

.section-cream {
  background: var(--bg-cream);
}

.hero {
  padding: 34px 0 70px;
}

.hero-grid {
  display: grid;
  gap: 44px;
  align-items: center;
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--brand-green);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.1;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 780px;
  margin-bottom: 18px;
  font-size: 40px;
  font-weight: 900;
  line-height: 1.04;
}

h2 {
  margin-bottom: 18px;
  font-size: 34px;
  font-weight: 900;
  line-height: 1.12;
}

.lead,
.story-copy p,
.curve-copy p,
.solution-copy p,
.final-inner p {
  color: var(--muted);
  font-size: 18px;
  font-weight: 650;
  line-height: 1.7;
}

.store-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 30px;
}

.popup-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 58px;
  border: 0;
  border-radius: var(--radius-btn);
  font-weight: 800;
  text-decoration: none;
}

.popup-btn-store {
  z-index: 0;
  gap: 10px;
  min-width: 176px;
  padding: 10px 22px;
  color: #fff;
  background: var(--ink);
  box-shadow: 0 12px 22px rgba(19, 33, 18, 0.14);
}

.popup-btn-store::after {
  position: absolute;
  inset: auto 12px -4px;
  z-index: -1;
  height: 10px;
  content: "";
  border-radius: 0 0 var(--radius-btn) var(--radius-btn);
  background: rgba(20, 109, 41, 0.38);
}

.popup-btn-store:active {
  transform: translateY(2px);
}

.popup-btn-store.disabled {
  color: rgba(255, 255, 255, 0.72);
  background: #6c756b;
  box-shadow: none;
  cursor: not-allowed;
}

.popup-btn-store.disabled::after {
  background: rgba(76, 84, 75, 0.28);
}

.store-text {
  display: grid;
  gap: 1px;
  font-size: 17px;
  line-height: 1.05;
  text-align: left;
}

.store-text span {
  font-size: 11px;
  font-weight: 700;
  opacity: 0.74;
}

.popup-btn-kakao {
  display: inline-flex;
  min-height: 0;
  margin-top: 16px;
  padding: 0;
  color: var(--brand-green);
  font-size: 15px;
  font-weight: 800;
  background: transparent;
  border-radius: 0;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.android-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.hero-visual,
.curve-card {
  display: grid;
  place-items: center;
}

.timing-svg,
.curve-svg {
  width: 100%;
  max-width: 520px;
  overflow: visible;
}

.clock-base,
.clock-ring {
  fill: none;
  stroke-width: 18;
}

.clock-base {
  stroke: #dcecd7;
}

.clock-ring {
  stroke: url("#heroRing");
  stroke-linecap: round;
  stroke-dasharray: 930;
  stroke-dashoffset: 930;
  transform: rotate(-90deg);
  transform-origin: 260px 260px;
  animation: ring-draw 2.6s ease-out infinite;
}

.clock-hand {
  stroke: var(--ink);
  stroke-linecap: round;
  stroke-width: 12;
}

.clock-hand.short {
  stroke: var(--brand-green);
}

.timing-card {
  animation: card-pop 2.6s ease-in-out infinite;
  transform-origin: 352px 164px;
}

.pulse-dot {
  animation: pulse-pop 2.6s ease-in-out infinite;
}

.story-section {
  padding: 86px 0;
}

.story-grid,
.repeat-grid {
  display: grid;
  gap: 42px;
  align-items: center;
}

.problem-card-stack {
  position: relative;
  width: 100%;
  max-width: 420px;
  aspect-ratio: 4 / 5;
  margin: 0 auto;
}

.problem-card {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 28px;
  border: 1px solid rgba(19, 33, 18, 0.12);
  border-radius: var(--radius-card);
  background: var(--bg-white);
  box-shadow: 0 10px 30px rgba(19, 33, 18, 0.08);
  transition: transform 0.6s ease, opacity 0.6s ease, filter 1.4s ease;
}

.problem-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
}

.problem-tag {
  color: var(--brand-green);
  font-weight: 700;
}

.problem-question {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.problem-choices {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 0;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  list-style: none;
}

.card-fresh {
  z-index: 2;
  transform: rotate(-3deg) translate(-14px, -10px);
}

.problem-section.in-view .card-fresh {
  animation: freshFade 2.6s linear 3.3s forwards;
}

.card-faded {
  z-index: 1;
  opacity: 1;
  filter: url(#shatter) blur(0);
  transform: rotate(6deg) translate(56px, 36px);
}

.problem-section.in-view .card-faded {
  animation: memoryFlicker 4s ease-in 0.3s forwards;
}

.curve-card {
  padding: 18px;
}

.axis {
  stroke: #9baa96;
  stroke-width: 3;
  stroke-linecap: round;
}

.curve-guide {
  fill: none;
  stroke: #dcecd7;
  stroke-width: 12;
  stroke-linecap: round;
}

.curve-line {
  fill: none;
  stroke: var(--brand-green);
  stroke-width: 12;
  stroke-linecap: round;
  transition: stroke-dashoffset 2s ease;
}

.in-view .curve-line {
  stroke-dashoffset: 0;
}

.curve-label {
  fill: var(--muted);
  font-family: 'Pretendard Variable', 'Pretendard', sans-serif;
  font-size: 18px;
  font-weight: 800;
  opacity: 0;
  transition: opacity 0.5s ease, transform 0.5s ease;
  transform: translateY(10px);
}

.in-view .curve-label {
  opacity: 1;
  transform: translateY(0);
}

.in-view .label-1 { transition-delay: 0.15s; }
.in-view .label-2 { transition-delay: 0.28s; }
.in-view .label-3 { transition-delay: 0.4s; }
.in-view .label-4 { transition-delay: 0.52s; }
.in-view .label-5 { transition-delay: 0.64s; }
.in-view .label-6 { transition-delay: 0.76s; }

.repeat-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.repeat-card {
  position: sticky;
  top: 96px;
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 6px 16px;
  align-items: center;
  min-height: 92px;
  margin-top: -40px;
  padding: 18px;
  border: 2px solid rgba(31, 143, 56, 0.12);
  border-radius: var(--radius-card);
  background: #fff;
  box-shadow: 0 18px 34px rgba(31, 143, 56, 0.11);
  opacity: 0;
  transform: translateY(40px);
  transition: transform 0.9s cubic-bezier(.2, .7, .2, 1), opacity 0.9s;
}

.repeat-card:first-child {
  margin-top: 0;
}

.repeat-section.in-view .repeat-card {
  opacity: 1;
  transform: translateY(0);
}

.repeat-section.in-view .repeat-card:nth-child(1) {
  transition-delay: 0s;
}

.repeat-section.in-view .repeat-card:nth-child(2) {
  transition-delay: 0.18s;
}

.repeat-section.in-view .repeat-card:nth-child(3) {
  transition-delay: 0.36s;
}

.repeat-card span {
  display: grid;
  width: 54px;
  height: 54px;
  place-items: center;
  border-radius: 18px;
  color: #fff;
  background: var(--brand-green);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
}

.repeat-card strong {
  font-size: 17px;
}

.repeat-gauge {
  grid-column: 2;
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: #e5eddc;
}

.repeat-gauge-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--brand-green), var(--brand-green-hi));
  transition: width 1.2s ease 0.2s;
}

.repeat-section.in-view .repeat-card:nth-child(1) .repeat-gauge-fill {
  width: 60%;
}

.repeat-section.in-view .repeat-card:nth-child(2) .repeat-gauge-fill {
  width: 85%;
}

.repeat-section.in-view .repeat-card:nth-child(3) .repeat-gauge-fill {
  width: 98%;
}

.solution-phone {
  display: flex;
  justify-content: center;
}

.phone-frame {
  position: relative;
  width: 280px;
  aspect-ratio: 280 / 560;
  padding: 14px;
  border-radius: 44px;
  background: #111;
  box-shadow: 0 30px 60px -20px rgba(19, 33, 18, 0.35), inset 0 0 0 2px #2a2a2a;
}

.phone-notch {
  position: absolute;
  top: 14px;
  left: 50%;
  z-index: 3;
  width: 110px;
  height: 22px;
  border-radius: 0 0 14px 14px;
  background: #000;
  transform: translateX(-50%);
}

.phone-screen {
  display: flex;
  height: 100%;
  flex-direction: column;
  gap: 16px;
  padding: 44px 16px 20px;
  overflow: hidden;
  border-radius: 32px;
  background: var(--bg-white);
}

.review-notification {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  color: #fff;
  border-radius: 14px;
  background: var(--brand-green);
  font-size: 13px;
  opacity: 0;
  transform: translateY(-120%);
}

.review-notification-icon {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 16px;
  font-weight: 700;
}

.review-notification-body {
  display: flex;
  flex-direction: column;
}

.review-notification-body strong {
  font-size: 14px;
  font-weight: 800;
}

.review-notification-body span {
  font-size: 12px;
  opacity: 0.9;
}

.solution-section.in-view .review-notification {
  animation: slideInNotif 0.7s cubic-bezier(.2, .7, .2, 1) 0.4s forwards;
}

.review-queue {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.review-queue li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  color: var(--ink);
  border-radius: 12px;
  background: #F3F6F3;
  font-size: 13px;
  font-weight: 600;
  opacity: 0;
  transform: translateX(-12px);
  transition: opacity 0.5s, transform 0.5s;
}

.solution-section.in-view .review-queue li {
  opacity: 1;
  transform: translateX(0);
}

.solution-section.in-view .review-queue li:nth-child(1) {
  transition-delay: 0.9s;
}

.solution-section.in-view .review-queue li:nth-child(2) {
  transition-delay: 1.1s;
}

.solution-section.in-view .review-queue li:nth-child(3) {
  transition-delay: 1.3s;
}

.queue-tag {
  padding: 4px 8px;
  color: #0b3f14;
  border-radius: 8px;
  background: var(--brand-green-hi);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  font-weight: 800;
}

.final-cta {
  padding: 88px 0;
  color: #fff;
  background: var(--brand-green);
  text-align: center;
}

.final-inner {
  display: grid;
  justify-items: center;
}

.final-cta .section-kicker,
.final-cta p {
  color: rgba(255, 255, 255, 0.86);
}

.final-cta h2 {
  margin-bottom: 12px;
  color: #fff;
}

.final-cta .popup-btn-store {
  color: var(--ink);
  background: #fff;
}

.final-cta .popup-btn-store.disabled {
  color: rgba(19, 33, 18, 0.55);
  background: rgba(255, 255, 255, 0.66);
}

.final-cta .popup-btn-kakao {
  color: #fff;
}

.final-cta .store-row {
  justify-content: center;
}

.site-footer {
  background: var(--bg-cream);
  padding: 72px 0 28px;
  color: var(--muted);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-logo {
  font-family: 'Space Grotesk', 'Pretendard Variable', sans-serif;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--brand-green);
}

.footer-tagline {
  margin: 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  line-height: 1.5;
  max-width: 240px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-heading {
  margin: 0;
  font-size: 12px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
}

.footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-list a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.footer-list a:hover {
  color: var(--brand-green);
}

.footer-pending {
  color: rgba(68, 84, 67, 0.5);
  font-size: 14px;
  font-weight: 500;
}

.footer-bottom {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid rgba(31, 143, 56, 0.14);
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(68, 84, 67, 0.75);
}

.footer-bottom a {
  color: rgba(68, 84, 67, 0.75);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-bottom a:hover {
  color: var(--brand-green);
}

.reveal-block {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.in-view .reveal-block {
  opacity: 1;
  transform: translateY(0);
}

/* §5.5 link-section */
.link-section .story-grid {
  align-items: center;
}

.link-canvas {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  gap: 20px;
}

.link-wrong {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.wrong-card {
  padding: 12px 14px;
  border: 2px solid rgba(31, 143, 56, 0.12);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 10px 20px rgba(31, 143, 56, 0.08);
  display: grid;
  gap: 4px;
  opacity: 0;
  transform: translateX(-18px);
  transition: transform 0.55s cubic-bezier(.2, .7, .2, 1), opacity 0.55s;
}

.link-section.in-view .wrong-card:nth-child(1) { opacity: 1; transform: translateX(0); transition-delay: 0s; }
.link-section.in-view .wrong-card:nth-child(2) { opacity: 1; transform: translateX(0); transition-delay: 0.12s; }
.link-section.in-view .wrong-card:nth-child(3) { opacity: 1; transform: translateX(0); transition-delay: 0.24s; }

.wrong-tag {
  font-size: 12px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(15, 34, 12, 0.55);
}

.wrong-card strong {
  font-size: 15px;
  color: #1a2a16;
}

.link-lines {
  display: none;
  width: 100%;
  height: 280px;
  overflow: visible;
}

.link-path {
  fill: none;
  stroke: var(--brand-green);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 240;
  stroke-dashoffset: 240;
  transition: stroke-dashoffset 0.55s ease;
}

.link-section.in-view .link-path-1 { stroke-dashoffset: 0; transition-delay: 0.4s; }
.link-section.in-view .link-path-2 { stroke-dashoffset: 0; transition-delay: 0.52s; }
.link-section.in-view .link-path-3 { stroke-dashoffset: 0; transition-delay: 0.64s; }

.link-dot {
  fill: var(--brand-green);
  opacity: 0;
  transition: opacity 0.3s ease 0.95s;
}

.link-section.in-view .link-dot {
  opacity: 1;
}

.link-note {
  position: relative;
  padding: 20px 20px 20px 36px;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 20px 40px rgba(31, 143, 56, 0.14);
  opacity: 0;
  transform: translateX(18px);
  transition: transform 0.55s cubic-bezier(.2, .7, .2, 1) 0.8s, opacity 0.55s 0.8s;
}

.link-section.in-view .link-note {
  opacity: 1;
  transform: translateX(0);
}

.note-binding {
  position: absolute;
  left: 12px;
  top: 20px;
  bottom: 20px;
  width: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.note-binding span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #FFF8E7;
  box-shadow: inset 0 0 0 2px rgba(31, 143, 56, 0.35);
}

.note-label {
  margin: 0 0 4px;
  font-size: 12px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(15, 34, 12, 0.5);
}

.note-title {
  margin: 0 0 12px;
  font-weight: 700;
  font-size: 17px;
  color: var(--brand-green);
}

.note-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.note-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: rgba(15, 34, 12, 0.78);
}

.note-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--brand-green);
  font-weight: 700;
}

.note-list li.mastered {
  transition: opacity 0.6s ease, color 0.6s ease;
}

.note-list li.mastered::after {
  content: '';
  position: absolute;
  left: 20px;
  right: 0;
  top: 50%;
  height: 1.5px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.55s cubic-bezier(.2, .7, .2, 1);
}

.link-section.in-view .note-list li.mastered {
  opacity: 0.45;
  color: rgba(15, 34, 12, 0.5);
  transition-delay: 1.5s;
}

.link-section.in-view .note-list li.mastered::after {
  transform: scaleX(1);
  transition-delay: 1.5s;
}

@media (min-width: 768px) {
  .link-canvas {
    grid-template-columns: minmax(0, 0.95fr) 140px minmax(0, 1.1fr);
    gap: 0;
    min-height: 320px;
  }
  .link-lines {
    display: block;
  }
}

@keyframes ring-draw {
  0% { stroke-dashoffset: 930; }
  52%, 100% { stroke-dashoffset: 180; }
}

@keyframes card-pop {
  0%, 46% {
    opacity: 0;
    transform: scale(0.84) translateY(10px);
  }
  58%, 92% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
  100% {
    opacity: 0;
    transform: scale(0.96) translateY(-4px);
  }
}

@keyframes pulse-pop {
  0%, 45% {
    opacity: 0;
    transform: scale(0.75);
  }
  55%, 92% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.12);
  }
}

@keyframes memoryFlicker {
  0%   { opacity: 1;    filter: url(#shatter) blur(0);    transform: rotate(6deg) translate(56px, 36px) scale(1); }
  20%  { opacity: 0.92; filter: url(#shatter) blur(1.5px); }
  40%  { opacity: 0.78; filter: url(#shatter) blur(4px); }
  60%  { opacity: 0.58; filter: url(#shatter) blur(7px);   transform: rotate(6deg) translate(56px, 36px) scale(1.02); }
  80%  { opacity: 0.3;  filter: url(#shatter) blur(11px);  transform: rotate(6deg) translate(56px, 36px) scale(1.06); }
  100% { opacity: 0;    filter: url(#shatter) blur(16px);  transform: rotate(6deg) translate(56px, 36px) scale(1.1); }
}

@keyframes freshFade {
  0%   { opacity: 1;    filter: blur(0); }
  30%  { opacity: 0.92; filter: blur(0.6px); }
  60%  { opacity: 0.7;  filter: blur(2px); }
  100% { opacity: 0.38; filter: blur(4px); }
}

@keyframes slideInNotif {
  from {
    opacity: 0;
    transform: translateY(-120%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }

  .curve-line {
    stroke-dashoffset: 0;
  }

  .repeat-card,
  .reveal-block,
  .review-notification,
  .review-queue li {
    opacity: 1;
    transform: none;
  }

  .problem-section.in-view .card-faded {
    opacity: 0.4;
    filter: blur(4px);
    animation: none;
  }

  .problem-section.in-view .card-fresh {
    opacity: 0.6;
    filter: blur(2px);
    animation: none;
  }

  .repeat-card {
    position: static;
    margin-top: 16px;
  }

  .repeat-card:first-child {
    margin-top: 0;
  }

  .review-notification {
    animation: none;
  }

  .review-queue li {
    transition: none;
  }

  .link-section.in-view .wrong-card,
  .link-section.in-view .link-note {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .link-section.in-view .link-path {
    stroke-dashoffset: 0;
    transition: none;
  }

  .link-section.in-view .link-dot {
    opacity: 1;
    transition: none;
  }

  .link-section.in-view .note-list li.mastered {
    opacity: 0.45;
    color: rgba(15, 34, 12, 0.5);
    transition: none;
  }

  .link-section.in-view .note-list li.mastered::after {
    transform: scaleX(1);
    transition: none;
  }
}

@media (min-width: 768px) {
  .shell {
    width: min(100% - 64px, var(--shell));
  }

  .hero {
    padding: 44px 0 82px;
  }

  .hero-grid {
    min-height: calc(100svh - 156px);
    grid-template-columns: 1.02fr 0.98fr;
    gap: 48px;
  }

  h1 {
    font-size: 64px;
  }

  h2 {
    font-size: 48px;
  }

  .story-section {
    padding: 112px 0;
  }

  .story-grid,
  .repeat-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 62px;
  }

  .story-grid.reversed {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1.3fr 1fr;
    gap: 56px;
  }

  .footer-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 1200px) {
  :root {
    --shell: 1180px;
  }

  h1 {
    font-size: 78px;
  }

  h2 {
    font-size: 56px;
  }

  .lead,
  .story-copy p,
  .curve-copy p,
  .solution-copy p,
  .final-inner p {
    font-size: 20px;
  }
}

@media (max-width: 640px) {
  .problem-card-stack {
    max-width: 320px;
    aspect-ratio: 3 / 4;
  }

  .problem-card {
    padding: 22px;
  }

  .problem-question {
    font-size: 15px;
  }

  .problem-choices {
    font-size: 13px;
  }
}

@media (max-width: 420px) {
  .shell {
    width: min(100% - 32px, var(--shell));
  }

  h1 {
    font-size: 38px;
  }

  h2 {
    font-size: 32px;
  }

  .popup-btn-store {
    width: 100%;
  }

  .store-row {
    align-items: stretch;
  }
}

/* ===== 지원 과목 섹션 (hub topic cluster) ===== */
.subjects {
  padding: 72px 0 64px;
}
.subjects-inner {
  text-align: center;
}
.subjects-kicker {
  font-size: 12px;
  font-weight: 650;
  color: var(--brand-green, #1f8f38);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
}
.subjects-heading {
  font-size: clamp(28px, 4vw, 40px);
  margin: 0 0 12px;
  color: var(--ink, #132112);
}
.subjects-lead {
  color: var(--muted, #445443);
  margin: 0 auto 40px;
  max-width: 560px;
  line-height: 1.6;
}
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  text-align: left;
  max-width: 880px;
  margin: 0 auto;
}
.subject-card {
  background: #f4f9ef;
  border: 1px solid rgba(31, 143, 56, 0.12);
  border-radius: 24px;
  padding: 28px 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.subject-card-live:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(20, 109, 41, 0.08);
}
.subject-card-body { flex: 1; }
.subject-card-eyebrow {
  font-size: 12px;
  font-weight: 650;
  color: var(--brand-green, #1f8f38);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}
.subject-card h3 {
  font-size: 22px;
  margin: 0 0 12px;
  color: var(--ink, #132112);
}
.subject-card p {
  color: var(--muted, #445443);
  line-height: 1.6;
  margin: 0;
  font-size: 15px;
}
.subject-card-cta {
  font-weight: 650;
  color: var(--brand-green, #1f8f38);
  text-decoration: none;
  align-self: flex-start;
  font-size: 15px;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
}
.subject-card-cta:hover {
  border-bottom-color: var(--brand-green, #1f8f38);
}
.subject-card-soon {
  background: #fafafa;
  border-color: rgba(0, 0, 0, 0.06);
  opacity: 0.88;
}
.subject-card-soon .subject-card-eyebrow { color: var(--muted, #445443); }

/* ===== story-subtext + inline link ===== */
.story-subtext {
  margin-top: 16px !important;
  color: var(--muted, #445443);
  font-size: 15px;
  line-height: 1.7;
}
.story-inline-link {
  color: var(--brand-green, #1f8f38);
  font-weight: 650;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
}
.story-inline-link:hover {
  text-decoration-thickness: 2.5px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  padding: 22px 28px;
  border: 1px solid rgba(19, 33, 18, 0.08);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 6px 18px rgba(19, 33, 18, 0.05);
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.faq-item:hover {
  border-color: rgba(31, 143, 56, 0.28);
  box-shadow: 0 12px 28px rgba(19, 33, 18, 0.08);
  transform: translateY(-1px);
}
.faq-item[open] {
  border-color: rgba(31, 143, 56, 0.3);
  box-shadow: 0 14px 32px rgba(31, 143, 56, 0.1);
}
.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  list-style: none;
  position: relative;
  padding-right: 44px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  width: 28px;
  height: 28px;
  margin-top: -14px;
  border-radius: 50%;
  background: rgba(31, 143, 56, 0.1);
  background-image: linear-gradient(currentColor, currentColor), linear-gradient(currentColor, currentColor);
  background-size: 12px 2px, 2px 12px;
  background-position: center;
  background-repeat: no-repeat;
  color: var(--brand-green);
  transition: transform 0.25s ease, background-color 0.2s ease;
}
.faq-item[open] summary::after {
  background-size: 12px 2px, 0 0;
  background-color: var(--brand-green);
  color: #fff;
}
.faq-item p {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(19, 33, 18, 0.06);
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.75;
}

.final-cta-secondary { margin-top: 12px; font-size: 14px; color: var(--muted); }
.final-cta-secondary a { color: var(--brand-green); font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }

.app-screenshots-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  max-width: 1080px;
  margin: 0 auto;
}
.app-screenshot { margin: 0; display: flex; flex-direction: column; align-items: center; }
.phone-mockup {
  width: 100%;
  max-width: 200px;
  aspect-ratio: 368 / 800;
  border-radius: 28px;
  background: #111;
  padding: 6px;
  box-shadow: 0 18px 40px rgba(19, 33, 18, 0.18), 0 4px 12px rgba(19, 33, 18, 0.08);
  overflow: hidden;
}
.phone-mockup img {
  width: 100%;
  height: 100%;
  border-radius: 22px;
  display: block;
  object-fit: cover;
}
.app-screenshot figcaption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
}
@media (max-width: 820px) {
  .app-screenshots-row {
    display: flex;
    grid-template-columns: none;
    gap: 16px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 4px 16px 16px;
    margin: 0 -16px;
    max-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .app-screenshots-row .app-screenshot {
    flex: 0 0 60%;
    scroll-snap-align: center;
  }
  .phone-mockup { max-width: none; }
}