:root {
  /* ブランドカラー */
  --color-primary-blue: #0099CC;
  --color-primary-blue-dark: #0283C1;
  --color-grey: #73797c;
  --color-charcoal-grey: #30353A;
  --color-light-blue: #cddfef;
  --color-accent-orange: #eb6100;

  /* システムカラー */
  --color-white: #FFFFFF;
  --color-black: #000000;

  /* グラデーション */
  --gradient-hero: linear-gradient(135deg, rgba(238, 244, 247, 0) 0%, rgba(238, 244, 247, 0.8) 50%, rgba(238, 244, 247, 0.2) 100%);
  --gradient-primary: linear-gradient(-135deg, rgba(238, 244, 247, 0.2) 0%, rgba(238, 244, 247, 0.8) 50%, rgba(238, 244, 247, 0.2) 100%);

  /*.  フォントサイズ - 1960px基準 */
  --font-size-xl: 6.4rem;
  --font-size-lg: 4.8rem;
  --font-size-hero: 4.0rem;
  --font-size-md: 3.6rem;
  --font-size-sm: 2.4rem;
  --font-size-base: 1.6rem;
  --font-size-caption: 1.4rem;
}

html,
body {
  overflow-x: hidden;
  /* 横スクロールのみ禁止 */
  overflow-y: auto;
  /* 縦スクロールは許可 */
}

html {
  font-size: 62.5%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-white);
  color: var(--color-charcoal-grey);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  line-height: 1.9;
  letter-spacing: 0.06em;
  font-size: var(--font-size-base);
  font-weight: 400;
}

header,
section,
footer {
  padding-left: calc(100vw / 12);
  padding-right: calc(100vw / 12);
}

h1,
h2,
h3,
h4 {
  text-wrap: wrap;
  margin: 0;
  line-height: 1.5;
  font-weight: 700;
}

h1 {
  font-size: var(--font-size-xl);
  letter-spacing: 0.1em;
}

h2 {
  font-size: var(--font-size-lg);
  letter-spacing: 0.05em;
}

h3 {
  font-size: var(--font-size-md);
  letter-spacing: 0.05em;
}

h4 {
  font-size: var(--font-size-sm);
  letter-spacing: 0.05em;
}

ul {
  padding: 0;
}

ul>li {
  list-style-type: none;
}

.container {
  width: 100%;
  max-width: 1960px;
  margin: 0 auto 0 0;
}

.head_bg_area {
  position: relative;
  background: var(--gradient-hero);
}

/* header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.0);
  /* 透明 */
  border-bottom: 1px solid transparent;
  /* ボーダー透明 */
  transition: all 0.3s ease;
  /* スムーズなトランジション */
}

/* Header - スクロール時の状態 */
.header.scrolled {
  background: rgba(255, 255, 255, 0.7);
  /* 半透明白 */
  backdrop-filter: blur(10px);
  /* ブラー効果 */
  border-bottom: 1px solid rgba(255, 255, 255, 0.95);
  /* 薄いボーダー */
  box-shadow: 0 1px 15px rgba(0, 0, 0, 0.05);
  /* 影追加 */
}

header nav ul {
  display: flex;
  align-items: center;
  gap: 40px;
}

header nav ul a {
  text-decoration: none;
  color: var(--color-charcoal-grey);
  font-weight: 600;
  transition: color 0.3s ease;
}

.header-content {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo img {
  width: auto;
  height: 35px;
}

.header-right {
  font-size: var(--font-size-caption);
  display: flex;
  align-items: center;
  gap: 40px;
}

.header-cta a {
  display: block;
  padding: 8px 40px;
  background: transparent;
  color: var(--color-primary-blue);
  border: 2px solid var(--color-primary-blue);
  border-radius: 4px;
  text-decoration: none;
  font-weight: 400;
  transition: all 0.3s ease;
}

.header-cta a:hover {
  background: var(--color-primary-blue);
  color: var(--color-white);
}

/* ハンバーガーボタン（デスクトップでは非表示） */
.hamburger-btn {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 32px;
  height: 32px;
  justify-content: center;
  gap: 4px;
  position: relative;
}

.hamburger-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-charcoal-grey);
  transition: all 0.3s ease;
  transform-origin: center;
}

/* モバイルメニュー（デスクトップでは通常表示） */
.mobile-menu {
  display: flex;
  align-items: center;
  gap: 40px;
}

/* hero */
.hero {
  padding-top: 80px;
  min-height: calc(100vw * 0.49);
  max-height: 960px;
  letter-spacing: 0.1em;
  padding-right: 0;
  position: relative;
  z-index: 2;
  margin-bottom: -150px;
  display: flex;
  align-items: center;
}

.hero-content {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: calc((100vw * 0.49) - 80px);
  max-height: 825px;
  position: relative;
}

.hero-content::after {
  content: '';
  position: absolute;
  top: -24px;
  right: -40px;
  bottom: -40px;
  width: calc(100vw / 12 * 7);
  max-width: 1160px;
  background-image: url('../images/img_01.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  z-index: 1;
}

.hero-text {
  width: calc(100vw / 12 * 6);
  z-index: 2;
  position: relative;
  margin: 40px 0;
}

.hero-catchcopy {
  color: var(--color-primary-blue-dark);
  font-weight: 600;
  font-size: var(--font-size-hero);
  line-height: 1.5;
  margin-top: 0;
  letter-spacing: 0.13em;
}

.hero-title {
  color: var(--color-primary-blue-dark);
  font-size: var(--font-size-xl);
  margin-top: 16px;
  line-height: 1.3;
}

.hero-subtitle {
  margin-top: 24px;
}

.hero-image {
  display: none;
}

/* problem */
.problem {
  position: relative;
  z-index: 1;
  padding-top: 270px;
}

.problem-content {
  position: relative;
  z-index: 1;
}

.problem-content::before {
  content: '';
  position: absolute;
  top: 120px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100vw / 12 * 8);
  height: 100%;
  background: var(--gradient-primary);
  z-index: -1;
}

.problem .container {
  position: relative;
  z-index: 2;
}

.marketing-evolution,
.job-polarization {
  width: calc(100vw / 12 * 8);
  margin-top: 120px;
  background-color: var(--color-white);
  padding-top: 80px;
  padding-bottom: 80px;
}

.marketing-evolution {
  border-radius: 0 10px 10px 0;
  padding-right: calc(100vw / 12 * 1);
}

.marketing-evolution .before-after-container {
  grid-template-columns: 1fr 1fr;
  gap: calc(100vw / 12);
  padding: 0 calc(100vw / 24 * 1);
  margin-top: 48px;
}

.marketing-evolution .before-after-container h3 {
  color: var(--color-primary-blue-dark);
  margin-bottom: 0;
  margin-top: 16px;
}

.marketing-evolution .before-after-container h3 span {
  font-size: var(--font-size-sm);
}

.marketing-evolution .before-after-container .main-visual::before {
  width: calc(100vw / 12 * 1.3);
}

.job-polarization {
  border-radius: 10px 0 0 10px;
  padding-left: calc(100vw / 12 * 1);
  margin-left: auto;
}

.changes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 54px;
  margin-top: 60px;
}

.change-item p {
  margin-top: 24px;
}

.polarization-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 160px;
  align-items: center;
  margin-top: 80px;
  position: relative;
}

.polarization-container::before {
  content: '';
  position: absolute;
  top: calc(100vw / 24);
  bottom: calc(100vw / 24);
  width: 1px;
  background-color: var(--color-light-blue);
  z-index: 1;
  left: calc(50%);
}

.polarization-item {
  display: grid;
  grid-template-rows: 80px 1fr auto;
  gap: 40px;
}

.polarization-item h4 {
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.polarization-item-content {
  display: grid;
  grid-template-columns: 1.25fr 2fr;
  gap: 40px;
  align-items: center;
}

.task-list {
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.task-list li {
  padding: 8px 0;
  position: relative;
  padding-left: 20px;
}

.task-list li::before {
  content: '•';
  position: absolute;
  left: 0;
}

.polarization-item p {
  text-align: center;
  font-size: var(--font-size-sm);
  font-weight: 700;
  border: var(--color-charcoal-grey) 1px solid;
  border-radius: 9999px;
  padding: 16px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.problem::before {
  content: '';
  position: absolute;
  width: 1px;
  background-color: var(--color-primary-blue);
  height: 150px;
  bottom: 0;
  left: 50%;
  z-index: 3;
  margin-bottom: -210px;
}

/* solution-overview */
.solution-overview {
  margin-top: 330px;
}

.solution-overview .section-header {
  text-align: center;
}

.solution-overview .section-header p {
  font-size: var(--font-size-sm);
}

.solution-overview h2 {
  color: var(--color-primary-blue-dark);
}

.before-after-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(100vw / 12 * 2);
  align-items: center;
  margin: 120px auto 0;
  position: relative;
}

.before .main-visual {
  position: relative;
}

.before .main-visual::before {
  content: "";
  position: absolute;
  display: inline-block;
  top: 63%;
  right: calc(100vw / 12 * -1);
  width: calc(100vw / 12 * 1.5);
  height: 1px;
  margin-top: 13.5px;
  border-radius: 9999px;
  background-color: var(--color-primary-blue);
  z-index: 3;
}

.before .main-visual::after {
  content: "";
  position: absolute;
  top: calc(63% + 13.5px);
  right: calc(100vw / 12 * -1);
  width: 20px;
  height: 1px;
  border-radius: 9999px;
  background-color: var(--color-primary-blue);
  transform: rotate(45deg);
  transform-origin: calc(100% - 0.5px) 50%;
  z-index: 3;
}

.before,
.after {
  text-align: center;
  position: relative;
}

.before h3,
.after h3 {
  margin-bottom: 40px;
  letter-spacing: 0.1em;
}

.before h3 div:first-child,
.after h3 div:first-child {
  display: inline-block;
  padding: 8px;
  color: var(--color-white);
  width: calc(100vw / 12 * 2);
  font-weight: 400;
  font-size: var(--font-size-sm);
  margin-bottom: 20px;
}

.before h3 div:first-child {
  background: var(--color-grey);
}

.after h3 div:first-child {
  background: var(--color-primary-blue-dark);
}

.before h3 div:last-child,
.after h3 div:last-child {
  font-size: var(--font-size-md);
  font-weight: 400;
}

.chart-visual {
  margin-top: 24px;
}

.solution-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(100vw / 12);
  margin-top: 80px;
  position: relative;
  padding: calc(100vw / 24);
  background-color: var(--color-white);
  box-shadow: 0px 0px 50px 0px rgba(0, 152, 203, 0.2);
  border-radius: 10px;
}

.solution-cards::before,
.solution-cards::after {
  content: '';
  position: absolute;
  top: calc(100vw / 24);
  bottom: calc(100vw / 24);
  width: 1px;
  background-color: var(--color-light-blue);
  z-index: 1;
}

.solution-cards::before {
  left: calc(33.33%);
}

.solution-cards::after {
  right: calc(33.33%);
}

.solution-item p {
  margin-top: 24px;
}

/* 767px以下 - mobile */
@media (max-width: 767px) {}