:root {
  --swiper-theme-color: #383737;
  --text1: #383737;
  --text1-2: #6b7280;
  --text2: #f5f5f7;
  --text-dark: #111;
  --background-blue: #1e7efd;
  --background-blue-2: #4191fa;
  --background-white: #f5f5f7;
  --background-gray: #363636;
}

html {
  scroll-behavior: smooth;
  animation-name: top;
  animation-duration: 1s;
}

@keyframes top {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

body {
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 300;
}

.swiper {
  width: 100%;
}

.swiper-slide {
  display: flex;
  justify-content: center;
  align-items: center;
}

.swiper-slide img {
  display: block;
  width: 100%;
  margin-inline: auto;
  object-fit: cover;
  object-position: center;
}


header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  opacity: 0;
  width: 100%;
  background-color: rgba(60, 60, 60, 0.8);
  transform: translateY(-100%);
  transition: all 0.2s;
}

header.show {
  opacity: 1;
  transform: translateY(0);
}

header .container nav {
  display: flex;
  justify-content: space-between;
  padding: 16px clamp(20px, 4vw, 320px);
  color: var(--text2);
}


nav ul {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-toggle {
  display: none;
}

.nav-logo {
  font-size: 24px;
}

nav .cta-button {
  color: var(--text2);
  background-color: var(--background-blue);
  padding: 4px 16px;
  border-radius: 16px;
  transition: all 0.2s;
}

nav .cta-button:hover {
  color: var(--text2);
  background-color: var(--background-blue-2);
}


.mv {
  position: relative;
  background: var(--background-white);
  overflow: hidden;
  min-height: 100vh;
}

.mv picture,
.mv img {
  display: block;
  width: 100%;
}

.mv img {
  height: auto;
}

.mv-content {
  position: absolute;
  top: 34px;
  left: 50%;
  transform: translateX(-50%);
  width: min(92%, 1200px);
  text-align: center;
  z-index: 2;
}

.mv-brand {
  font-size: clamp(1.5rem, 2vw, 2.1rem);
  margin-bottom: 18px;
  color: var(--text1);
}

.mv-content h1 {
  font-size: clamp(3.2rem, 8vw, 8rem);
  line-height: 1.05;
  letter-spacing: 0.01em;
  transform: translateX(32px);
  margin-bottom: 26px;
  white-space: nowrap;
  color: var(--text1);
}

.tight {
  margin-right: -0.6em;
}

.mv-sub {
  font-size: clamp(1rem, 1.8vw, 1.5rem);
  margin-bottom: 30px;
  color: var(--text1);
}

.mv-content .cta-button {
  display: inline-block;
  color: var(--text2);
  background-color: var(--background-blue);
  padding: 12px 24px;
  border-radius: 24px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.mv-content .cta-button:hover {
  background-color: var(--background-blue-2);
  transform: translateY(-1px);
}


.feature-problem {
  width: 100%;
  height: 100vh;
  background: var(--background-white);
  padding: 88px 20px;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
}

.feature-problem h2 {
  font-size: 21px;
  color: #656565;
  margin-bottom: 28px;
}

.feature-problem ul {
  max-width: 520px;
  margin: 0 auto 42px;
  display: grid;
  gap: 10px;
}

.feature-problem ul li {
  position: relative;
  min-height: 50px;
  display: flex;
  align-items: center;
  padding: 0 20px 0 44px;
  background: #fbfbfb;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  font-size: 19px;
  color: #3f4756;
  text-align: left;
}

.feature-problem ul li::before {
  content: "×";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: #98a2b3;
  font-size: 17px;
}

.feature-problem p:first-of-type {
  font-size: 17px;
  color: #656565;
  margin-bottom: 16px;
}

.feature-problem p:last-of-type {
  font-size: clamp(26px, 3.5vw, 40px);
  line-height: 1.45;
  color: var(--text-dark);
}


.feature-design {
  display: grid;
  grid-template-columns: minmax(320px, 640px) minmax(320px, 460px);
  grid-template-rows: auto auto;
  align-items: center;
  justify-content: center;
  column-gap: 72px;
  row-gap: 8px;
  min-height: 100vh;
  padding: 80px 40px;
  background: var(--background-white);
}

.feature-design-img {
  grid-column: 1;
  grid-row: 1 / 3;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
}

.feature-design-text {
  grid-column: 2;
  grid-row: 1;
  align-self: end;
  width: 100%;
  max-width: 460px;
}

.feature-design-details {
  grid-column: 2;
  grid-row: 2;
  align-self: start;
  width: 100%;
  max-width: 460px;
}

.feature-design-img img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 2.5;
  object-fit: cover;
}

.feature-design-text h2 {
  font-size: clamp(32px, 4vw, 56px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text-dark);
  margin: 0 0 24px;
}

.feature-design-text p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text1-2);
  margin: 0;
}

.feature-design-details ul {
  display: grid;
  gap: 26px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.feature-design-details li {
  position: relative;
  padding-left: 18px;
}

.feature-design-details li::before {
  content: "•";
  position: absolute;
  left: 0;
  top: 0.1em;
  color: var(--text-dark);
}

.feature-design-details strong {
  display: block;
  margin-bottom: 4px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
}

.feature-design-details span {
  display: block;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text1-2);
}


.feature-typing {
  background: var(--background-gray);
  min-height: 100vh;
  padding: 110px 20px 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.feature-typing h2 {
  margin: 0 0 12px;
  font-size: clamp(40px, 4.8vw, 68px);
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: #fff;
}

.feature-typing>p:first-of-type {
  margin: 0 0 10px;
  font-size: clamp(20px, 2vw, 30px);
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.92);
}

.feature-typing>p:nth-of-type(2) {
  margin: 0 0 34px;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.58);
}

.feature-typing img {
  display: block;
  width: min(100%, 560px);
  aspect-ratio: 16 / 10;
  object-fit: cover;
  margin: 0 auto 32px;
  border-radius: 6px;
}

.spec-container {
  width: min(100%, 640px);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 0 auto;
}

.spec {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.spec h3 {
  margin: 0;
  font-size: clamp(24px, 2vw, 34px);
  line-height: 1.2;
  color: #fff;
}

.spec p {
  margin: 0;
  font-size: 10px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.55);
}

.feature-typing-sound {
  background: var(--background-white);
  min-height: 100vh;
  padding: 80px 40px;
  display: grid;
  grid-template-columns: minmax(280px, 420px) minmax(320px, 620px);
  grid-template-rows: auto auto;
  justify-content: center;
  align-items: center;
  column-gap: 96px;
  row-gap: 8px;
}

.feature-typing-sound-text {
  grid-column: 1;
  grid-row: 1;
  align-self: end;
  max-width: 420px;
}

.feature-typing-sound img {
  grid-column: 2;
  grid-row: 1 / 3;
  display: block;
  width: min(100%, 620px);
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 10px;
}

.feature-typing-sound-desc {
  grid-column: 1;
  grid-row: 2;
  align-self: start;
  max-width: 420px;
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: #4b5563;
}

.feature-typing-sound h2 {
  margin: 0 0 28px;
  font-size: clamp(32px, 3.2vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.05em;
  color: var(--text-dark);
  white-space: pre-line;
}

.feature-typing-sound-text p {
  margin: 0;
  font-size: 18px;
  line-height: 1.6;
  color: var(--text-dark);
}


.feature-fatigue {
  background: var(--background-gray);
  color: #fff;
  min-height: 100vh;
  padding: 80px 40px;
  display: flex;
  align-items: center;
}

.feature-fatigue .container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(320px, 560px) minmax(280px, 360px);
  grid-template-rows: auto auto;
  align-items: center;
  justify-content: center;
  column-gap: 56px;
  row-gap: 8px;
}

.feature-fatigue .feature-fatigue-heading {
  grid-column: 2;
  grid-row: 1;
  align-self: end;
}

.feature-fatigue .feature-image {
  grid-column: 1;
  grid-row: 1 / 3;
}

.feature-fatigue .feature-image img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 8px;
}

.feature-fatigue .feature-text {
  grid-column: 2;
  grid-row: 2;
  align-self: start;
  max-width: 360px;
}

.feature-fatigue-heading h2 {
  margin: 0 0 18px;
  font-size: clamp(42px, 4.5vw, 68px);
  line-height: 1.1;
  letter-spacing: -0.04em;
  color: #fff;
}

.feature-fatigue .lead {
  margin: 0;
  font-size: 18px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.92);
}

.feature-fatigue .feature-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 24px;
}

.feature-fatigue .feature-list li {
  position: relative;
  padding-left: 18px;
}

.feature-fatigue .feature-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  top: 0.15em;
  font-size: 16px;
  line-height: 1;
  color: #fff;
}

.feature-fatigue .feature-list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 16px;
  line-height: 1.6;
  color: #fff;
}

.feature-fatigue .feature-list span {
  display: block;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.7);
}


.spec-section {
  background: var(--background-white);
  min-height: 100vh;
  padding: 90px 20px 96px;
}

.spec-section .container {
  max-width: 620px;
  margin: 0 auto;
}

.spec-title {
  margin: 0 0 52px;
  text-align: center;
  font-size: clamp(28px, 3vw, 44px);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.04em;
  color: var(--text-dark);
}

.spec-table {
  width: 100%;
}

.spec-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  align-items: center;
  column-gap: 24px;
  padding: 18px 0;
  border-top: 1px solid #e5e7eb;
}

.spec-row:first-child {
  border-top: none;
}

.spec-label {
  font-size: 13px;
  font-weight: 500;
  line-height: 1.6;
  color: #7a8496;
}

.spec-value {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-dark);
  text-align: right;
}


.cta-section {
  position: relative;
  min-height: 100vh;
  background: #000;
  color: var(--text2);

  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;

  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;

  background-image: url("img/1.png");
  background-size: cover;
  background-position: center;

  opacity: 0.3;
  z-index: 0;
}

.cta-section .container {
  position: relative;
  z-index: 1;
}

.cta-title {
  margin: 0 0 16px;
  font-size: clamp(48px, 5vw, 80px);
  letter-spacing: -0.04em;
}

.cta-sub {
  margin: 0 0 40px;
  font-size: 36px;
  color: rgba(255, 255, 255, 0.7);
}

.cta-button {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 999px;
  background: var(--background-blue);
  color: var(--text2);
  text-decoration: none;
  font-size: 15px;
  transition:
    transform 0.25s ease,
    background-color 0.25s ease,
    color 0.25s ease,
    box-shadow 0.25s ease;
}

.cta-button:hover {
  background-color: var(--background-blue-2);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
}


.footer {
  background: var(--background-gray);
  color: #fff;
  padding: 72px 20px 36px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  column-gap: 80px;
  row-gap: 32px;
  align-items: start;
}

.footer-brand h3 {
  margin: 0 0 18px;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: #fff;
}

.footer-brand p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
}

.footer-column h4 {
  margin: 0 0 18px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.78);
}

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

.footer-column li+li {
  margin-top: 10px;
}

.footer-column a {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.62);
  text-decoration: none;
  transition: color 0.25s ease;
}

.footer-column a:hover {
  color: rgba(255, 255, 255, 0.95);
}

.footer-bottom {
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
}


/* -----------
   animation
----------- */
.object {
  opacity: 0;
  transform: translateY(32px);
  filter: blur(6px);
  transition:
    opacity 0.9s ease,
    transform 0.9s ease,
    filter 0.9s ease;
  will-change: opacity, transform, filter;
}

.object.show {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

.object-image {
  transform: translateY(32px) scale(1.04);
}

.object-image.show {
  transform: translateY(0) scale(1);
}

@media (prefers-reduced-motion: reduce) {

  .object,
  .object-image {
    opacity: 1;
    transform: none;
    filter: none;
    transition: none;
  }
}

/* -------------------------
feature-problem animation
------------------------- */

.problem-heading.object {
  transition-delay: 0s;
}

.problem-list li.object:nth-child(1) {
  transition-delay: 0.08s;
}

.problem-list li.object:nth-child(2) {
  transition-delay: 0.16s;
}

.problem-list li.object:nth-child(3) {
  transition-delay: 0.24s;
}

.problem-lead.object {
  transition-delay: 0.32s;
}

.problem-message.object {
  transition-delay: 0.42s;
}


/* -------------------------
   feature-design animation
------------------------- */

.feature-design .feature-design-img.object {
  transition-delay: 0.05s;
}

.feature-design .feature-design-text h2.object {
  transition-delay: 0.12s;
}

.feature-design .feature-design-text p.object {
  transition-delay: 0.20s;
}

.feature-design .feature-design-details li.object:nth-child(1) {
  transition-delay: 0.28s;
}

.feature-design .feature-design-details li.object:nth-child(2) {
  transition-delay: 0.36s;
}

/* -------------------------
   feature-typing animation
------------------------- */

.feature-typing h2.object {
  transition-delay: 0.05s;
}

.feature-typing>p:nth-of-type(1).object {
  transition-delay: 0.12s;
}

.feature-typing>p:nth-of-type(2).object {
  transition-delay: 0.20s;
}

.feature-typing img.object {
  transition-delay: 0.30s;
}

.feature-typing .spec:nth-child(1).object {
  transition-delay: 0.40s;
}

.feature-typing .spec:nth-child(2).object {
  transition-delay: 0.48s;
}

.feature-typing .spec:nth-child(3).object {
  transition-delay: 0.56s;
}

/* --------------------------------
   feature-typing-sound animation
-------------------------------- */

.feature-typing-sound h2.object {
  transition-delay: 0.05s;
}

.feature-typing-sound-text p.object {
  transition-delay: 0.14s;
}

.feature-typing-sound-desc.object {
  transition-delay: 0.24s;
}

.feature-typing-sound img.object {
  transition-delay: 0.34s;
}

/* --------------------------------
   feature-fatigue animation
-------------------------------- */

.feature-fatigue .feature-image.object {
  transition-delay: 0.05s;
}

.feature-fatigue .feature-fatigue-heading h2.object {
  transition-delay: 0.14s;
}

.feature-fatigue .feature-fatigue-heading .lead.object {
  transition-delay: 0.22s;
}

.feature-fatigue .feature-list li.object:nth-child(1) {
  transition-delay: 0.30s;
}

.feature-fatigue .feature-list li.object:nth-child(2) {
  transition-delay: 0.38s;
}

.feature-fatigue .feature-list li.object:nth-child(3) {
  transition-delay: 0.46s;
}

/* --------------------------------
   spec-section animation
-------------------------------- */

.spec-section .spec-title.object {
  transition-delay: 0.05s;
}

.spec-section .spec-row.object {
  transform: translateY(18px);
}

.spec-section .spec-row.object:nth-child(1) {
  transition-delay: 0.12s;
}

.spec-section .spec-row.object:nth-child(2) {
  transition-delay: 0.18s;
}

.spec-section .spec-row.object:nth-child(3) {
  transition-delay: 0.24s;
}

.spec-section .spec-row.object:nth-child(4) {
  transition-delay: 0.30s;
}

.spec-section .spec-row.object:nth-child(5) {
  transition-delay: 0.36s;
}

.spec-section .spec-row.object:nth-child(6) {
  transition-delay: 0.42s;
}

.spec-section .spec-row.object:nth-child(7) {
  transition-delay: 0.48s;
}

.spec-section .spec-row.object:nth-child(8) {
  transition-delay: 0.54s;
}

/* --------------------------------
   cta-section animation
-------------------------------- */

.cta-section .cta-title.object {
  transition-delay: 0.05s;
}

.cta-section .cta-sub.object {
  transition-delay: 0.14s;
}

.cta-section .cta-button.object {
  transform: translateY(24px) scale(0.98);
  transition-delay: 0.24s;
}

.cta-section .cta-button.object.show {
  transform: translateY(0) scale(1);
}

.br-tablet {
  display: none;
}


/*--------------
   tablet
-------------- */
@media (max-width: 1024px) {
  .br-tablet {
    display: inline;
  }

  .header .container,
  .feature-problem .container,
  .spec-section .container,
  .cta-section .container,
  .footer-container {
    width: min(92%, 960px);
    margin: 0 auto;
  }

  header .container nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    width: 100%;
  }

  nav p {
    margin: 0;
    font-size: 24px;
    flex: 0 0 auto;
  }

  nav ul {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    gap: 24px;
    margin-left: auto;
  }

  nav li {
    margin: 0;
  }

  .mv {
    min-height: 100vh;
  }

  .mv img {
    min-height: 100vh;
    object-fit: cover;
    object-position: center bottom;
  }

  .mv-content {
    top: 110px;
    width: min(86%, 680px);
  }

  .mv-content h1,
  .mv-sub {
    transform: none;
  }

  .mv-brand {
    margin-bottom: 28px;
    font-size: 1rem;
  }

  .mv-content h1 {
    font-size: clamp(4.2rem, 10vw, 6.2rem);
    line-height: 1.08;
    letter-spacing: -0.04em;
    margin-bottom: 42px;
    white-space: normal;
    text-align: left;
    display: inline-block;
    transform: translateX(16px);
  }

  .mv-sub {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 48px;
  }

  .mv-content .cta-button {
    padding: 13px 28px;
    border-radius: 999px;
    font-size: 15px;
  }

  .swiper-slide {
    overflow: hidden;
  }

  .swiper-slide img {
    width: 112%;
    max-width: none;
  }

  .feature-problem {
    min-height: 100vh;
    height: auto;
    padding: 80px 20px;
  }

  .feature-design {
    grid-template-columns: 1fr;
    align-items: center;
    align-content: center;
    justify-content: center;
    row-gap: 32px;
    column-gap: 0;
    min-height: 100vh;
    padding: 72px 24px;
  }

  .feature-design-text,
  .feature-design-img,
  .feature-design-details {
    grid-column: auto;
    grid-row: auto;
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
  }

  .feature-design-text {
    margin-bottom: 0;
  }

  .feature-design-text h2 {
    transform: none;
    margin-bottom: 8px;
  }

  .feature-design-text p {
    margin-bottom: 0;
  }

  .feature-design-details ul {
    display: inline-grid;
    text-align: left;
  }

  .feature-typing,
  .feature-fatigue,
  .spec-section,
  .cta-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
  }

  .feature-typing {
    padding: 72px 20px;
    flex-direction: column;
    justify-content: center;
  }

  .feature-typing img {
    width: min(100%, 640px);
  }

  .feature-typing-sound {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr;
    align-items: center;
    align-content: center;
    justify-content: center;
    row-gap: 32px;
    column-gap: 0;
    padding: 72px 24px;
  }

  .feature-typing-sound-text,
  .feature-typing-sound img,
  .feature-typing-sound-desc {
    grid-column: auto;
    grid-row: auto;
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
  }

  .feature-typing-sound img {
    width: min(100%, 720px);
  }

  .feature-fatigue {
    padding: 72px 24px;
  }

  .feature-fatigue .container {
    grid-template-columns: 1fr;
    row-gap: 32px;
    column-gap: 0;
  }

  .feature-fatigue .feature-fatigue-heading,
  .feature-fatigue .feature-image,
  .feature-fatigue .feature-text {
    grid-column: auto;
    grid-row: auto;
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
  }

  .spec-section {
    padding: 88px 20px;
  }

  .spec-section .container {
    max-width: 680px;
  }

  .spec-row {
    column-gap: 20px;
  }

  .cta-section {
    padding: 72px 20px;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
    column-gap: 40px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}


/* --------------
   smartphone
-------------- */
@media (max-width: 767px) {

    /* sp header & hamburger icon */
  header {
    opacity: 1;
    transform: none;
    background: transparent;
    pointer-events: none;
  }

  header .container {
    width: 100%;
  }

  header .container nav {
    position: relative;
    padding: 0;
    width: 100%;
  }

  .nav-logo {
    display: none;
  }

  .nav-toggle {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 1101;
    width: 44px;
    height: 44px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    padding: 0;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.64);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    pointer-events: auto;
  }

  .nav-toggle span {
    display: block;
    width: 18px;
    height: 1.5px;
    margin: 0 auto;
    background: #fff;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .site-nav.is-open .nav-toggle span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
  }

  .site-nav.is-open .nav-toggle span:nth-child(2) {
    opacity: 0;
  }

  .site-nav.is-open .nav-toggle span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
  }

  .nav-menu {
    position: fixed;
    top: 68px;
    right: 16px;
    z-index: 1100;
    min-width: 180px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    border-radius: 16px;
    background: rgba(0, 0, 0, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition:
      opacity 0.2s ease,
      visibility 0.2s ease,
      transform 0.2s ease;
    pointer-events: auto;
  }

  .site-nav.is-open .nav-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-menu li {
    margin: 0;
  }

  .nav-menu a {
    display: block;
    padding: 12px 10px;
    color: var(--text2);
    text-align: left;
  }

  .nav-menu .cta-button {
    margin-top: 6px;
    text-align: center;
    padding: 10px 14px;
    border-radius: 999px;
  }

  .header .container,
  .feature-problem .container,
  .spec-section .container,
  .cta-section .container,
  .footer-container {
    width: min(92%, 100%);
  }

  .mv {
    min-height: 100vh;
  }

  .mv img {
    min-height: 100vh;
    object-fit: cover;
    object-position: center bottom;
  }

  .mv-content {
    top: 42px;
    width: 92%;
  }

  .mv-brand {
    margin-bottom: 12px;
    font-size: 1rem;
  }

  .mv-content h1 {
    font-size: clamp(3.1rem, 15vw, 5rem);
    line-height: 1.08;
    letter-spacing: -0.04em;
    margin-bottom: 18px;
    white-space: normal;
  }

  .mv-sub {
    font-size: 0.98rem;
    line-height: 1.8;
    margin-bottom: 22px;
  }

  .mv-content .cta-button {
    padding: 12px 22px;
    font-size: 14px;
    border-radius: 999px;
  }

  .swiper-slide img {
    width: 100%;
  }

  .feature-problem {
    min-height: 100vh;
    padding: 72px 20px 80px;
  }

  .feature-problem h2 {
    font-size: 18px;
    margin-bottom: 22px;
  }

  .feature-problem ul {
    max-width: 100%;
    margin-bottom: 32px;
    gap: 10px;
  }

  .feature-problem ul li {
    min-height: 46px;
    padding: 0 16px 0 38px;
    font-size: 16px;
  }

  .feature-problem ul li::before {
    left: 14px;
    font-size: 15px;
  }

  .feature-problem p:first-of-type {
    font-size: 15px;
    margin-bottom: 12px;
  }

  .feature-problem p:last-of-type {
    font-size: clamp(24px, 8vw, 32px);
    line-height: 1.5;
  }

  .feature-design {
    min-height: 100vh;
    padding: 56px 20px;
    grid-template-columns: 1fr;
    align-items: start;
    align-content: center;
    justify-content: center;
    row-gap: 40px;
    column-gap: 0;
  }

  .feature-design-img,
  .feature-design-text,
  .feature-design-details {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    text-align: center;
  }

  .feature-design-text h2 {
    font-size: clamp(28px, 8vw, 40px);
  }

  .feature-design-text p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 0;
  }

  .feature-design-details ul {
    gap: 18px;
  }

  .feature-design-details strong {
    font-size: 15px;
  }

  .feature-design-details span {
    font-size: 13px;
    line-height: 1.8;
  }

  .feature-typing {
    padding: 72px 20px 64px;
  }

  .feature-typing h2 {
    font-size: clamp(30px, 10vw, 42px);
    margin-bottom: 10px;
  }

  .feature-typing>p:first-of-type {
    font-size: 17px;
    margin-bottom: 8px;
  }

  .feature-typing>p:nth-of-type(2) {
    font-size: 11px;
    margin-bottom: 22px;
  }

  .feature-typing img {
    width: 100%;
    margin-bottom: 22px;
  }

  .spec-container {
    width: 100%;
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .spec h3 {
    font-size: 24px;
  }

  .spec p {
    font-size: 11px;
  }

  .feature-typing-sound {
    padding: 56px 20px;
    row-gap: 32px;
  }

  .feature-typing-sound h2 {
    margin-bottom: 18px;
    font-size: clamp(28px, 9vw, 40px);
  }

  .feature-typing-sound-text p {
    font-size: 16px;
  }

  .feature-typing-sound-desc {
    font-size: 14px;
    line-height: 1.8;
  }

  .feature-fatigue {
    padding: 56px 20px;
  }

  .feature-fatigue .container {
    row-gap: 24px;
  }

  .feature-fatigue-heading h2 {
    font-size: clamp(28px, 9vw, 40px);
    margin-bottom: 12px;
  }

  .feature-fatigue .lead {
    font-size: 16px;
  }

  .feature-fatigue .feature-list {
    gap: 16px;
  }

  .feature-fatigue .feature-list strong {
    font-size: 14px;
  }

  .feature-fatigue .feature-list span {
    font-size: 12px;
    line-height: 1.75;
  }

  .spec-section {
    padding: 72px 20px 80px;
  }

  .spec-title {
    margin-bottom: 32px;
    font-size: clamp(28px, 9vw, 40px);
  }

  .spec-row {
    grid-template-columns: 1fr;
    row-gap: 6px;
    padding: 14px 0;
  }

  .spec-label {
    font-size: 13px;
  }

  .spec-value {
    font-size: 14px;
    text-align: left;
  }

  .cta-section {
    min-height: 100vh;
    padding: 72px 20px;
  }

  .cta-title {
    font-size: clamp(30px, 10vw, 44px);
    margin-bottom: 12px;
  }

  .cta-sub {
    font-size: 15px;
    margin-bottom: 24px;
  }

  .cta-button {
    padding: 12px 22px;
    font-size: 14px;
  }

  .footer {
    padding: 48px 20px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    row-gap: 24px;
  }

  .footer-brand h3 {
    margin-bottom: 10px;
  }

  .footer-column h4 {
    margin-bottom: 10px;
  }

  .footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    font-size: 12px;
  }
}