/* ============================================
   GLOW Serum — Korean Cosmetics D2C LP
   ============================================ */

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-blush: #FFE4E1;
  --color-white: #FFFFFF;
  --color-ink: #1A1A1A;
  --color-rose-gold: #B76E79;
  --color-gold: #D4A843;
  --color-light-gray: #F9F6F4;
  --color-border: #E8E0DD;
  --font-display: "Fraunces", serif;
  --font-body: "Inter Tight", sans-serif;
  --font-jp: "Zen Kaku Gothic New", sans-serif;
  --section-spacing: 100px;
  --inner-max: 1080px;
  --transition: 0.3s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-jp);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-ink);
  background-color: var(--color-white);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: opacity var(--transition);
}

a:hover {
  opacity: 0.8;
}

ul {
  list-style: none;
}

/* ---------- Utility ---------- */
.hero__br-sp,
.problems__br-sp {
  display: none;
}

.solution__br-pc {
  display: inline;
}

/* ============================================
   Header
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-rose-gold);
}

.header__nav {
  display: flex;
  align-items: center;
}

.header__nav-list {
  display: flex;
  gap: 32px;
}

.header__nav-item {
  display: flex;
  align-items: center;
}

.header__nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-ink);
  transition: color var(--transition);
}

.header__nav-link:hover {
  color: var(--color-rose-gold);
  opacity: 1;
}

.header__cta-btn {
  display: inline-block;
  padding: 8px 20px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-rose-gold);
  border-radius: 50px;
  letter-spacing: 0.04em;
  transition: background-color var(--transition), transform var(--transition);
}

.header__cta-btn:hover {
  background-color: #a25d67;
  transform: translateY(-1px);
  opacity: 1;
}

/* ============================================
   Hero
   ============================================ */
.hero {
  padding-top: calc(64px + var(--section-spacing));
  padding-bottom: var(--section-spacing);
  background: linear-gradient(168deg, var(--color-blush) 0%, var(--color-white) 60%);
}

.hero__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero__content {
  flex: 1;
}

.hero__subtitle {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-rose-gold);
  margin-bottom: 16px;
}

.hero__title {
  font-family: var(--font-jp);
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-ink);
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}

.hero__description {
  font-size: 1rem;
  line-height: 2;
  color: #555;
  margin-bottom: 40px;
}

.hero__cta-btn {
  display: inline-block;
  padding: 18px 48px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  background: linear-gradient(135deg, var(--color-rose-gold) 0%, #d48a93 100%);
  border-radius: 50px;
  letter-spacing: 0.08em;
  box-shadow: 0 8px 30px rgba(183, 110, 121, 0.35);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero__cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(183, 110, 121, 0.45);
  opacity: 1;
}

.hero__note {
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--color-rose-gold);
  font-weight: 500;
}

.hero__image {
  flex: 0 0 380px;
}

.hero__image-img {
  width: 100%;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(183, 110, 121, 0.15);
}

/* ============================================
   Problems
   ============================================ */
.problems {
  padding: var(--section-spacing) 0;
  background-color: var(--color-light-gray);
}

.problems__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.problems__heading {
  font-family: var(--font-jp);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 56px;
  color: var(--color-ink);
}

.problems__list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.problems__item {
  background-color: var(--color-white);
  border-radius: 16px;
  padding: 40px 24px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
  transition: transform var(--transition), box-shadow var(--transition);
}

.problems__item:hover {
  transform: translateY(-4px);
}

.problems__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  font-size: 1.75rem;
  background-color: var(--color-blush);
  border-radius: 50%;
}

.problems__text {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #444;
}

/* ============================================
   Solution / Ingredients
   ============================================ */
.solution {
  padding: var(--section-spacing) 0;
  background-color: var(--color-white);
}

.solution__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.solution__label {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-rose-gold);
  margin-bottom: 12px;
}

.solution__heading {
  font-family: var(--font-jp);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 24px;
  color: var(--color-ink);
}

.solution__lead {
  font-size: 0.9375rem;
  line-height: 2;
  color: #555;
  margin-bottom: 48px;
}

.solution__image-wrap {
  max-width: 480px;
  margin: 0 auto 56px;
  border-radius: 20px;
  overflow: hidden;
}

.solution__image {
  width: 100%;
  border-radius: 20px;
}

.solution__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.solution__card {
  background-color: var(--color-light-gray);
  border-radius: 16px;
  padding: 40px 28px;
  text-align: left;
  transition: transform var(--transition), box-shadow var(--transition);
}

.solution__card:hover {
  transform: translateY(-4px);
}

.solution__card-number {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-rose-gold);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.solution__card-title {
  font-family: var(--font-jp);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-ink);
}

.solution__card-text {
  font-size: 0.875rem;
  line-height: 1.9;
  color: #555;
}

/* ============================================
   Before / After
   ============================================ */
.before-after {
  padding: var(--section-spacing) 0;
  background-color: var(--color-blush);
}

.before-after__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.before-after__label {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-rose-gold);
  margin-bottom: 12px;
}

.before-after__heading {
  font-family: var(--font-jp);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 16px;
  color: var(--color-ink);
}

.before-after__note {
  font-size: 0.75rem;
  color: #888;
  margin-bottom: 48px;
}

.before-after__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 820px;
  margin: 0 auto;
}

.before-after__column {
  position: relative;
}

.before-after__badge {
  display: inline-block;
  padding: 6px 20px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  border-radius: 50px;
  margin-bottom: 16px;
}

.before-after__badge--before {
  background-color: #E0D6D3;
  color: #666;
}

.before-after__badge--after {
  background-color: var(--color-rose-gold);
  color: var(--color-white);
}

.before-after__image {
  width: 100%;
  border-radius: 16px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.before-after__caption {
  margin-top: 16px;
  font-size: 0.875rem;
  color: #555;
}

/* ============================================
   How to Use
   ============================================ */
.howto {
  padding: var(--section-spacing) 0;
  background-color: var(--color-white);
}

.howto__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.howto__label {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-rose-gold);
  margin-bottom: 12px;
}

.howto__heading {
  font-family: var(--font-jp);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 56px;
  color: var(--color-ink);
}

.howto__steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.howto__step {
  text-align: center;
}

.howto__step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin: 0 auto 24px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  background-color: var(--color-rose-gold);
  border-radius: 50%;
}

.howto__step-image-wrap {
  margin-bottom: 24px;
  border-radius: 16px;
  overflow: hidden;
}

.howto__step-image {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 16px;
}

.howto__step-title {
  font-family: var(--font-jp);
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-ink);
}

.howto__step-text {
  font-size: 0.875rem;
  line-height: 1.9;
  color: #555;
}

/* ============================================
   Reviews
   ============================================ */
.reviews {
  padding: var(--section-spacing) 0;
  background-color: var(--color-light-gray);
}

.reviews__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.reviews__label {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-rose-gold);
  margin-bottom: 12px;
}

.reviews__heading {
  font-family: var(--font-jp);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 16px;
  color: var(--color-ink);
}

.reviews__summary {
  font-size: 1rem;
  color: #555;
  margin-bottom: 48px;
}

.reviews__summary strong {
  font-weight: 700;
  color: var(--color-rose-gold);
  font-size: 1.125rem;
}

.reviews__list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.reviews__card {
  background-color: var(--color-white);
  border-radius: 16px;
  padding: 32px 28px;
  text-align: left;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
  transition: transform var(--transition);
}

.reviews__card:hover {
  transform: translateY(-3px);
}

.reviews__stars {
  font-size: 1rem;
  color: var(--color-gold);
  margin-bottom: 16px;
  letter-spacing: 0.08em;
}

.reviews__comment {
  font-size: 0.875rem;
  line-height: 1.9;
  color: #444;
  margin-bottom: 20px;
}

.reviews__author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reviews__name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-ink);
}

.reviews__age {
  font-size: 0.75rem;
  color: #888;
}

/* ============================================
   FAQ
   ============================================ */
.faq {
  padding: var(--section-spacing) 0;
  background-color: var(--color-white);
}

.faq__inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.faq__label {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-rose-gold);
  margin-bottom: 12px;
}

.faq__heading {
  font-family: var(--font-jp);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 48px;
  color: var(--color-ink);
}

.faq__list {
  text-align: left;
}

.faq__item {
  border-bottom: 1px solid var(--color-border);
}

.faq__item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__question::marker {
  content: "";
}

.faq__question-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.6;
  flex: 1;
  padding-right: 16px;
}

.faq__icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  position: relative;
  border-radius: 50%;
  background-color: var(--color-light-gray);
  transition: background-color var(--transition), transform var(--transition);
}

.faq__icon::before,
.faq__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background-color: var(--color-ink);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.faq__icon::before {
  width: 12px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.faq__icon::after {
  width: 2px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.faq__item[open] .faq__icon {
  background-color: var(--color-rose-gold);
}

.faq__item[open] .faq__icon::before,
.faq__item[open] .faq__icon::after {
  background-color: var(--color-white);
}

.faq__item[open] .faq__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq__answer {
  padding: 0 0 24px;
}

.faq__answer p {
  font-size: 0.9375rem;
  line-height: 2;
  color: #555;
}

/* ============================================
   Pricing
   ============================================ */
.pricing {
  padding: var(--section-spacing) 0;
  background: linear-gradient(168deg, var(--color-blush) 0%, #FFF0ED 100%);
}

.pricing__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.pricing__label {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-rose-gold);
  margin-bottom: 12px;
}

.pricing__heading {
  font-family: var(--font-jp);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 48px;
  color: var(--color-ink);
}

.pricing__card {
  max-width: 560px;
  margin: 0 auto;
  background-color: var(--color-white);
  border-radius: 24px;
  padding: 48px 40px;
  box-shadow: 0 12px 48px rgba(183, 110, 121, 0.12);
}

.pricing__product-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 8px;
  line-height: 1.6;
}

.pricing__supply {
  font-size: 0.875rem;
  font-weight: 400;
  color: #888;
}

.pricing__prices {
  margin: 32px 0;
}

.pricing__original {
  font-size: 0.9375rem;
  color: #888;
  margin-bottom: 8px;
}

.pricing__original-amount {
  text-decoration: line-through;
  color: #999;
}

.pricing__sale {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-rose-gold);
  margin-bottom: 4px;
}

.pricing__sale-price {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--color-ink);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.pricing__yen {
  font-size: 2rem;
  font-weight: 700;
}

.pricing__tax {
  font-size: 0.875rem;
  font-weight: 400;
  color: #888;
  font-family: var(--font-jp);
}

.pricing__discount {
  display: inline-block;
  margin-top: 12px;
  padding: 6px 20px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-white);
  background-color: #E74C3C;
  border-radius: 50px;
  letter-spacing: 0.06em;
}

.pricing__benefits {
  margin: 32px 0;
  text-align: left;
}

.pricing__benefit {
  font-size: 0.9375rem;
  padding: 8px 0;
  color: #444;
  line-height: 1.6;
}

.pricing__cta-btn {
  display: inline-block;
  width: 100%;
  max-width: 400px;
  padding: 20px 32px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
  background: linear-gradient(135deg, var(--color-rose-gold) 0%, #d48a93 100%);
  border-radius: 50px;
  letter-spacing: 0.08em;
  box-shadow: 0 8px 30px rgba(183, 110, 121, 0.35);
  transition: transform var(--transition), box-shadow var(--transition);
}

.pricing__cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(183, 110, 121, 0.45);
  opacity: 1;
}

.pricing__cta-note {
  margin-top: 16px;
  font-size: 0.75rem;
  color: #888;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 60px 0 40px;
  background-color: var(--color-ink);
  color: rgba(255, 255, 255, 0.6);
}

.footer__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-white);
  margin-bottom: 24px;
}

.footer__nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
}

.footer__link {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition);
}

.footer__link:hover {
  color: var(--color-white);
  opacity: 1;
}

.footer__legal {
  font-size: 0.6875rem;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.35);
  margin-bottom: 24px;
}

.footer__copyright {
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.3);
}

/* ============================================
   Sticky CTA Bar
   ============================================ */
.sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 900;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
  transform: translateY(100%);
  opacity: 0;
  transition: transform 0.4s ease, opacity 0.4s ease;
  pointer-events: none;
}

.sticky-cta.is-visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.sticky-cta__inner {
  max-width: var(--inner-max);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sticky-cta__info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sticky-cta__price {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-ink);
}

.sticky-cta__price-original {
  text-decoration: line-through;
  color: #999;
  font-weight: 400;
  font-size: 0.875rem;
}

.sticky-cta__badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-white);
  background-color: #E74C3C;
  border-radius: 50px;
  letter-spacing: 0.04em;
}

.sticky-cta__btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-white);
  background: linear-gradient(135deg, var(--color-rose-gold) 0%, #d48a93 100%);
  border-radius: 50px;
  letter-spacing: 0.06em;
  box-shadow: 0 4px 16px rgba(183, 110, 121, 0.3);
  transition: transform var(--transition), box-shadow var(--transition);
}

.sticky-cta__btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(183, 110, 121, 0.4);
  opacity: 1;
}

/* ============================================
   Media Queries — Tablet (768px)
   ============================================ */
@media screen and (max-width: 768px) {
  :root {
    --section-spacing: 72px;
  }

  .header__nav {
    display: none;
  }

  .header__inner {
    height: 56px;
  }

  .hero {
    padding-top: calc(56px + 60px);
  }

  .hero__inner {
    flex-direction: column;
    gap: 40px;
    text-align: center;
  }

  .hero__title {
    font-size: 2rem;
  }

  .hero__description {
    margin-bottom: 32px;
  }

  .hero__image {
    flex: 0 0 auto;
    max-width: 320px;
    margin: 0 auto;
  }

  .hero__br-sp {
    display: inline;
  }

  .solution__br-pc {
    display: none;
  }

  .problems__heading {
    font-size: 1.625rem;
  }

  .problems__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .problems__item {
    padding: 32px 20px;
  }

  .problems__br-sp {
    display: inline;
  }

  .solution__heading,
  .before-after__heading,
  .howto__heading,
  .reviews__heading,
  .faq__heading,
  .pricing__heading {
    font-size: 1.625rem;
  }

  .solution__cards {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .solution__card {
    padding: 32px 24px;
  }

  .before-after__grid {
    gap: 24px;
  }

  .howto__steps {
    grid-template-columns: 1fr;
    gap: 40px;
    max-width: 400px;
    margin: 0 auto;
  }

  .reviews__list {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .reviews__card {
    padding: 28px 24px;
  }
  .pricing__card {
    padding: 40px 28px;
  }

  .pricing__sale-price {
    font-size: 3rem;
  }

  .footer__nav {
    gap: 16px;
  }

  .sticky-cta__inner {
    padding: 10px 16px;
  }

  .sticky-cta__badge {
    display: none;
  }
}

/* ============================================
   Media Queries — Mobile (480px)
   ============================================ */
@media screen and (max-width: 480px) {
  :root {
    --section-spacing: 56px;
  }

  html {
    font-size: 15px;
  }

  .header__inner {
    padding: 0 16px;
  }

  .header__cta-btn {
    padding: 6px 16px;
    font-size: 0.75rem;
  }

  .hero__inner {
    padding: 0 16px;
  }

  .hero__title {
    font-size: 1.625rem;
  }

  .hero__cta-btn {
    padding: 16px 36px;
    font-size: 0.9375rem;
  }

  .hero__image {
    max-width: 260px;
  }

  .problems__inner,
  .solution__inner,
  .before-after__inner,
  .howto__inner,
  .reviews__inner,
  .faq__inner,
  .pricing__inner,
  .footer__inner {
    padding: 0 16px;
  }

  .problems__list {
    grid-template-columns: 1fr;
  }

  .problems__item {
    padding: 28px 20px;
  }

  .problems__icon {
    width: 56px;
    height: 56px;
    font-size: 1.5rem;
  }

  .before-after__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .pricing__card {
    padding: 32px 20px;
  }

  .pricing__sale-price {
    font-size: 2.5rem;
  }

  .pricing__yen {
    font-size: 1.5rem;
  }

  .pricing__cta-btn {
    padding: 18px 24px;
    font-size: 1rem;
  }

  .footer__nav {
    flex-direction: column;
    gap: 12px;
  }

  .sticky-cta__inner {
    flex-direction: column;
    gap: 8px;
    padding: 10px 16px;
  }

  .sticky-cta__btn {
    width: 100%;
    text-align: center;
  }
}