/* ===== ANIMATABLE CUSTOM PROPERTIES ===== */
@property --light-x {
  syntax: "<percentage>";
  inherits: false;
  initial-value: 98%;
}
@property --light-y {
  syntax: "<percentage>";
  inherits: false;
  initial-value: -8%;
}
@property --light-r {
  syntax: "<number>";
  inherits: false;
  initial-value: 255;
}
@property --light-g {
  syntax: "<number>";
  inherits: false;
  initial-value: 238;
}
@property --light-b {
  syntax: "<number>";
  inherits: false;
  initial-value: 200;
}
@property --rim-angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}
@property --beam-from-1 {
  syntax: "<angle>";
  inherits: false;
  initial-value: 190deg;
}
@property --beam-from-2 {
  syntax: "<angle>";
  inherits: false;
  initial-value: 200deg;
}
@property --beam-from-3 {
  syntax: "<angle>";
  inherits: false;
  initial-value: 178deg;
}
/* ビームフォールオフ — 完全透明になるビューポート高さ位置（100% = フォールオフなし） */
@property --beam-fo-end-1 {
  syntax: "<percentage>";
  inherits: false;
  initial-value: 100%;
}
@property --beam-fo-end-2 {
  syntax: "<percentage>";
  inherits: false;
  initial-value: 100%;
}
@property --beam-fo-end-3 {
  syntax: "<percentage>";
  inherits: false;
  initial-value: 100%;
}
@property --title-c1-r {
  syntax: "<number>";
  inherits: true;
  initial-value: 60;
}
@property --title-c1-g {
  syntax: "<number>";
  inherits: true;
  initial-value: 100;
}
@property --title-c1-b {
  syntax: "<number>";
  inherits: true;
  initial-value: 255;
}
@property --title-c2-r {
  syntax: "<number>";
  inherits: true;
  initial-value: 80;
}
@property --title-c2-g {
  syntax: "<number>";
  inherits: true;
  initial-value: 210;
}
@property --title-c2-b {
  syntax: "<number>";
  inherits: true;
  initial-value: 255;
}
@property --title-c3-r {
  syntax: "<number>";
  inherits: true;
  initial-value: 160;
}
@property --title-c3-g {
  syntax: "<number>";
  inherits: true;
  initial-value: 60;
}
@property --title-c3-b {
  syntax: "<number>";
  inherits: true;
  initial-value: 255;
}

/* ===== DESIGN TOKENS ===== */
:root {
  /* Core */
  --bg-color: #fff;
  --main-color: #0e0d6a;
  --accent-color: #5cb6e6;
  --text-color: #222;
  --text-subtle: #aaafb3;
  --font-main: "Noto Sans JP", sans-serif;
  --font-sub: "Montserrat", sans-serif;
  --section-padding: 6.25rem 1.25rem;
  --nav-height: 4.5rem;
  --nav-height-expanded: 7rem;

  /* Glass Morphism */
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.45);
  --glass-shadow: 0 8px 32px rgba(40, 60, 80, 0.1);
  --glass-blur: blur(16px) saturate(180%);

  /* Hero Dark */
  --hero-bg-1: #060b18;
  --hero-bg-2: #0d1b2a;
  --hero-bg-3: #1b263b;
}

/* ===== RESET & BASE ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.5;
  font-feature-settings: "palt";
  overflow-x: hidden;
}

a {
  text-decoration: none !important;
  color: inherit;
  transition:
    opacity 0.4s,
    scale 0.4s;

  &:hover {
    opacity: 0.9;
    scale: 1.03;
  }
}

ul {
  list-style: none;
}

.kdg-container {
  max-width: 75rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.kdg-light-beam {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  mix-blend-mode: screen;
}

.kdg-light-beam--1 {
  background: conic-gradient(
    from var(--beam-from-1) at var(--light-x) var(--light-y),
    transparent 0deg,
    rgb(var(--light-r) var(--light-g) var(--light-b) / 0.44) 12deg,
    rgb(var(--light-r) var(--light-g) var(--light-b) / 0.33) 35deg,
    rgb(var(--light-r) var(--light-g) var(--light-b) / 0.12) 58deg,
    transparent 70deg
  );
  mask-image: linear-gradient(
    to bottom,
    black 0%,
    transparent var(--beam-fo-end-1)
  );

  .has-js & {
    animation: beam-intro-1 2s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both;
  }
}

.kdg-light-beam--2 {
  background: conic-gradient(
    from var(--beam-from-2) at var(--light-x) var(--light-y),
    transparent 0deg,
    rgb(
        calc(var(--light-r) - 25) calc(var(--light-g) + 15)
          calc(var(--light-b) + 50) / 0.2
      )
      6deg,
    rgb(
        calc(var(--light-r) - 25) calc(var(--light-g) + 15)
          calc(var(--light-b) + 50) / 0.12
      )
      28deg,
    transparent 46deg
  );
  mask-image: linear-gradient(
    to bottom,
    black 0%,
    transparent var(--beam-fo-end-2)
  );

  .has-js & {
    animation: beam-intro-2 2.4s cubic-bezier(0.22, 1, 0.36, 1) 0.35s both;
  }
}

.kdg-light-beam--3 {
  background: conic-gradient(
    from var(--beam-from-3) at var(--light-x) var(--light-y),
    transparent 0deg,
    rgb(
        calc(var(--light-r) + 18) calc(var(--light-g) - 8)
          calc(var(--light-b) - 38) / 0.16
      )
      5deg,
    rgb(
        calc(var(--light-r) + 18) calc(var(--light-g) - 8)
          calc(var(--light-b) - 38) / 0.09
      )
      22deg,
    transparent 36deg
  );
  mask-image: linear-gradient(
    to bottom,
    black 0%,
    transparent var(--beam-fo-end-3)
  );

  .has-js & {
    animation: beam-intro-3 1.7s cubic-bezier(0.12, 0.8, 0.3, 1) 0.05s both;
  }
}

@keyframes beam-intro-1 {
  from {
    --beam-from-1: 220deg;
    opacity: 0;
  }
  to {
    --beam-from-1: 190deg;
    opacity: 1;
  }
}

@keyframes beam-intro-2 {
  from {
    --beam-from-2: 230deg;
    opacity: 0;
  }
  to {
    --beam-from-2: 200deg;
    opacity: 1;
  }
}

@keyframes beam-intro-3 {
  from {
    --beam-from-3: 208deg;
    opacity: 0;
  }
  to {
    --beam-from-3: 178deg;
    opacity: 1;
  }
}

/* ===== NAVIGATION (Glass) ===== */
.kdg-navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height-expanded);
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(2rem) saturate(180%);
  -webkit-backdrop-filter: blur(2rem) saturate(180%);
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  transition:
    height 0.4s ease,
    background 0.4s,
    border-bottom-color 0.4s,
    box-shadow 0.4s;

  & .kdg-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
  }

  &.kdg-navbar--scrolled {
    height: var(--nav-height);
  }

  &.kdg-navbar--dark {
    background: rgba(6, 11, 24, 0.3);
    border-bottom-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(2rem) saturate(160%);
    -webkit-backdrop-filter: blur(2rem) saturate(160%);

    & .logo {
      & .logo-h-pos {
        opacity: 0;
      }
      & .logo-h-neg {
        opacity: 1;
      }
    }

    & .nav-links a {
      color: rgba(255, 255, 255, 0.85);
    }

    & .nav-toggle {
      color: rgba(255, 255, 255, 0.85);
    }
  }

  &.kdg-navbar--scrolled .logo {
    & .logo-h-pos {
      opacity: 0;
    }
    & .logo-h-neg {
      opacity: 0;
    }
    & .logo-pos {
      opacity: 1;
    }
  }

  &.kdg-navbar--scrolled.kdg-navbar--dark .logo {
    & .logo-pos {
      opacity: 0;
    }
    & .logo-neg {
      opacity: 1;
    }
  }

  @media (max-width: 48rem) {
    &.is-open {
      & .nav-links {
        display: flex;
      }

      &.kdg-navbar--dark .nav-links {
        background: rgba(6, 11, 30, 0.9);
      }

      & .nav-toggle span {
        &:nth-child(1) {
          transform: translateY(7px) rotate(45deg);
        }
        &:nth-child(2) {
          opacity: 0;
        }
        &:nth-child(3) {
          transform: translateY(-7px) rotate(-45deg);
        }
      }
    }
  }
}

.logo {
  position: relative;
  display: flex;
  align-items: center;
  width: 24rem;
  height: 2.25rem;
  z-index: 10;
  overflow: visible;

  &:hover {
    opacity: 0.8;
    scale: 1;
  }

  & img {
    width: auto;
    height: 100%;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    pointer-events: none;
  }

  & .logo-h-pos,
  & .logo-h-neg {
    height: 2.5rem;
  }

  & .logo-h-pos {
    opacity: 1;
  }
}

.nav-links {
  display: flex;
  gap: 1.75rem;

  & a {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    position: relative;
    transition:
      color 0.4s,
      opacity 0.4s;

    &::after {
      content: "";
      position: absolute;
      bottom: -0.3125rem;
      left: 0;
      width: 0%;
      height: 0.125rem;
      background: linear-gradient(90deg, var(--main-color) 0%, #0599e6 100%);
      transition: width 0.3s;
    }

    &:hover::after {
      width: 100%;
    }
  }

  @media (max-width: 48rem) {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    height: calc(100dvh - var(--nav-height));
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    background: rgba(240, 242, 245, 0.9);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    overflow-y: auto;

    & a {
      font-size: 1.25rem;
      letter-spacing: 0.08em;

      &::after {
        display: none;
      }
    }
  }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--main-color);
  z-index: 1001;
  flex-shrink: 0;

  & span {
    display: block;
    width: 1.5rem;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition:
      transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
      opacity 0.25s;
  }

  @media (max-width: 48rem) {
    display: flex;
  }
}

/* ===== COMMON SECTION STYLES ===== */
.kdg-section {
  padding: var(--section-padding);
  position: relative;
}

.section-title {
  font-family: var(--font-sub);
  font-size: clamp(2.5rem, 10vw, 10rem);
  font-weight: 100;
  margin: 0 0 3.75rem;
  text-align: center;
  letter-spacing: -0.05em;
  position: relative;
  display: block;
  background: linear-gradient(
    135deg,
    rgb(var(--title-c1-r) var(--title-c1-g) var(--title-c1-b)) 0%,
    rgb(var(--title-c2-r) var(--title-c2-g) var(--title-c2-b)) 44%,
    rgb(var(--title-c3-r) var(--title-c3-g) var(--title-c3-b)) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;

  & span {
    letter-spacing: 0em;
  }

  @media (max-width: 48rem) {
    margin-bottom: 2rem;
  }
}

/* ===== SCROLL-REVEAL (Intersection Observer driven) ===== */
.has-js {
  & .scroll-reveal {
    opacity: 0;
    transform: translateY(2.5rem);
    transition:
      opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
      transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);

    &.is-visible {
      opacity: 1;
      transform: translateY(0);
    }
  }

  & .stagger-item {
    opacity: 0;
    transform: translateY(2rem) scale(0.96);
    transition:
      opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
      transform 0.7s cubic-bezier(0.16, 1, 0.3, 1),
      box-shadow 0.4s;

    &.is-visible {
      opacity: 1;
      transform: translateY(0) scale(1);
    }
  }
}

/* ===== HERO SECTION (Full-screen Image Parallax) ===== */
.kdg-hero {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: left;
  position: relative;
  overflow: hidden;
  color: #fff;
  background-image:
    linear-gradient(
      135deg,
      rgba(6, 11, 24, 0.1) 0%,
      rgba(13, 27, 42, 0.7) 100%
    ),
    url("/content/dam/kddi-com/biz/digitalgate/2026/img/img-bg-hero-00.png");
  background-attachment: fixed;
  background-size: cover;
  background-position: center;

  & .hero-content {
    position: relative;
    z-index: 2;
    will-change: transform, opacity;
    width: 100%;

    & h1 {
      font-size: clamp(2.5rem, 12vw, 7rem);
      font-weight: 700;
      line-height: 1;
      margin-bottom: 4rem;
      animation: heroTitleReveal 2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
      text-shadow: 0 0 30px #1e2e5c40;
    }

    & p {
      font-size: clamp(1.2rem, 5vw, 2.5rem);
      letter-spacing: 0.05em;
      color: rgba(255, 255, 255, 0.75);
      animation: heroSubReveal 1.8s cubic-bezier(0.16, 1, 0.3, 1) 0.5s forwards;
      opacity: 0;
    }
  }

  & .scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    letter-spacing: 0.25em;
    animation: bounce 2.5s infinite;
    z-index: 2;
    color: rgba(255, 255, 255, 0.55);

    &::after {
      content: "";
      display: block;
      width: 1px;
      height: 2.5rem;
      background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0.55),
        transparent
      );
      margin: 0.75rem auto 0;
    }
  }
}

@keyframes heroTitleReveal {
  0% {
    opacity: 0;
    transform: translateY(2.5rem);
    filter: blur(1rem);
    letter-spacing: 2rem;
  }
  100% {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
    letter-spacing: -0.005rem;
  }
}

@keyframes heroSubReveal {
  0% {
    opacity: 0;
    transform: translateY(1.5rem);
    filter: blur(1rem);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

@keyframes bounce {
  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-0.625rem);
  }
  60% {
    transform: translateY(-0.3125rem);
  }
}

/* ===== TOPICS SECTION (Horizontal Scroll) ===== */
.kdg-topics-section {
  position: relative;
  color: var(--text-color);
  overflow: hidden;
  padding: var(--section-padding);
  background-image:
    linear-gradient(
      135deg,
      rgba(240, 246, 252, 0.1) 0%,
      rgba(202, 218, 220, 0.2) 100%
    ),
    url("/content/dam/kddi-com/biz/digitalgate/2026/img/img-bg-topics-00.png");
  background-attachment: fixed;
  background-size: cover;
  background-position: center;

  & .section-title {
    text-align: left;
    font-size: clamp(3.5rem, 12vw, 12rem);
    margin-left: -0.5rem;
    line-height: 0.9;
    margin-bottom: 2.5rem;

    @media (max-width: 48rem) {
      margin-left: 0;
      text-align: center;
    }
  }
}

/* ===== STATEMENT SECTION ===== */
.kdg-statement {
  position: relative;
  width: 100%;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: left;
  color: #fff;
  overflow: hidden;
  background-image:
    linear-gradient(135deg, rgba(0, 0, 0, 0.7) 0%, rgba(20, 20, 15, 0.4) 100%),
    url("/content/dam/kddi-com/biz/digitalgate/2026/img/img-bg-statement-00.png");
  background-attachment: fixed;
  background-size: cover;
  background-position: center;

  & .section-title {
    text-align: right;
    font-size: clamp(2rem, 15vw, 12.5rem);
    letter-spacing: -0.075em;
    margin-bottom: 2.5rem;
    /* Layout to browser right edge */
    margin-right: calc(50% - 20vw);
    width: calc(100% + (50vw - 50%));
    padding-right: 1.25rem;

    @media (max-width: 64rem) {
      margin-right: 0;
      width: 100%;
    }

    @media (max-width: 48rem) {
      margin-right: 0;
      width: 100%;
      padding-right: 1.25rem;
      text-align: center;
    }
  }

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

  & .statement-text {
    font-size: clamp(1rem, 3vw, 1.5rem);
    font-weight: 300;
    line-height: 2;
    margin: 0 0 2rem 0;
    max-width: 50rem;
    color: rgba(255, 255, 255, 0.9);

    @media (max-width: 48rem) {
      padding: 0 1.25rem;
      text-align: center;
    }
  }
}

/* ===== SERVICE SECTION (Circle Chart + Capability Cards) ===== */
.kdg-service {
  background-color: var(--bg-color);
  background-image:
    linear-gradient(135deg, rgba(100, 100, 110, 0.3), rgba(60, 50, 77, 0.6)),
    url("/content/dam/kddi-com/biz/digitalgate/2026/img/img-bg-service-00.png");
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  position: relative;
  overflow: hidden;

  & .section-title {
    text-align: left;
    font-size: clamp(4rem, 16vw, 14rem);
    letter-spacing: -0.075em;
    line-height: 0.8;
    margin-left: -4vw;
    width: calc(100% + 4vw);
    margin-bottom: 8rem;
    white-space: nowrap;

    @media (max-width: 64rem) {
      margin-left: -4vw;
      width: calc(100% + 4vw);
    }

    @media (max-width: 48rem) {
      margin-left: 0;
      width: 100%;
      text-align: center;
      margin-bottom: 3rem;
      white-space: normal;
    }
  }

  & > .kdg-container {
    position: relative;
    z-index: 1;
  }

  & .service-stage {
    display: flex;
    flex-direction: column;
    gap: 8rem;
    position: relative;
    margin-bottom: 4rem;

    &.is-active {
      & .service-capabilities {
        opacity: 1;
      }
      & .capability-card {
        opacity: 1;
        transform: translateX(0);
        &:nth-child(1) {
          transition-delay: 0.6s, 0.6s, 0s;
        }
        &:nth-child(2) {
          transition-delay: 1s, 1s, 0s;
        }
        &:nth-child(3) {
          transition-delay: 1.4s, 1.4s, 0s;
        }
        &:nth-child(4) {
          transition-delay: 1.8s, 1.8s, 0s;
        }
        &:nth-child(5) {
          transition-delay: 2.2s, 2.2s, 0s;
        }
        &:nth-child(6) {
          transition-delay: 2.6s, 2.6s, 0s;
        }
      }
    }

    @media (max-width: 48rem) {
      gap: 2rem;
    }
  }

  & .service-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    width: 50rem;
    margin-left: auto;

    /* Panel background — ソリッド地でグラス cards と差別化 */
    background: rgba(252, 253, 255, 0.8);
    border-radius: 0.5rem;
    box-shadow:
      -8px 0 48px rgba(14, 13, 14, 0.08),
      0 4px 24px rgba(0, 0, 0, 0.05);
    overflow: hidden;

    img {
      width: 100%;
      aspect-ratio: 21 / 9;
      object-fit: cover;
      object-position: center 30%;
      border-radius: 0;
      flex-shrink: 0;
    }

    p {
      width: 100%;
      font-size: clamp(1rem, 2vw, 1.2rem);
      line-height: 1.75;
      color: var(--text-color);
      padding: 2rem 3rem;
    }

    @media (max-width: 64rem) {
      width: 80%;
      p {
        padding: 1.75rem 2rem 2.25rem;
      }
    }

    @media (max-width: 48rem) {
      width: 100%;
      margin-left: 0;
      img {
        aspect-ratio: 16 / 9;
        object-position: center;
      }

      p {
        padding: 1.5rem;
      }
    }
  }

  & .service-core-wrap {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  & .service-core-label {
    font-size: clamp(1.25rem, 2.5vw, 2rem);
    font-weight: 700;
    color: #fff;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    letter-spacing: 0.1em;
  }

  & .service-core {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 2rem;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.2);
    padding: 6rem 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(2rem, 5vw, 5rem);

    @media (max-width: 48rem) {
      flex-direction: column;
      align-items: center;
      gap: 1.5rem;
    }
  }

  & .formula-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
  }

  & .service-core.scroll-reveal {
    transform: translateY(2rem) scale(0.97);

    &.is-visible {
      transform: translateY(0) scale(1);
    }
  }

  & .service-core .stagger-item {
    transform: translateY(1.5rem);

    &.is-visible {
      transform: translateY(0) scale(1);
    }
  }

  & .formula-bracket {
    height: clamp(6rem, 9vw, 10rem);
    width: auto;
    color: var(--accent-color);
    flex-shrink: 0;
  }

  & .formula-term {
    font-size: clamp(1.75rem, 2.8vw, 2.5rem);
    font-weight: 600;
    color: #fff;
    line-height: 1.2;
    text-align: left;
  }

  & .formula-exp {
    font-size: clamp(1.25rem, 2.5vw, 2rem);
    font-weight: 600;
    color: #fff;
    align-self: flex-start;
    margin-left: clamp(-1.5rem, -1.5vw, -0.5rem);
  }

  & .formula-x {
    height: clamp(3rem, 5vw, 5rem);
    width: auto;
    color: #fff;
    margin-left: -1rem;
    flex-shrink: 0;
  }

  & .service-capabilities-label {
    font-size: clamp(1.25rem, 2.5vw, 2rem);
    font-weight: 700;
    color: #fff;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    letter-spacing: 0.1em;
  }

  & .service-capabilities {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
    opacity: 0;
    transition: opacity 0.4s 0.3s;
    padding-top: 1rem;

    @media (max-width: 48rem) {
      grid-template-columns: 1fr;
      opacity: 1;
      transition: none;
    }
  }

  & .capability-card {
    display: flex;
    align-items: stretch;
    background: rgba(252, 253, 255, 0.8);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: var(--glass-shadow);
    opacity: 0;
    transform: translateX(3.5rem);
    transition:
      opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
      transform 0.7s cubic-bezier(0.16, 1, 0.3, 1),
      box-shadow 0.3s;

    & img {
      width: 14rem;
      min-width: 10rem;
      flex-shrink: 0;
      object-fit: cover;
      object-position: center;

      @media (max-width: 64rem) {
        width: 100%;
        height: 14rem;
      }
    }

    & .capability-body {
      flex: 1;
      padding: 1.25rem;
      min-width: 0;
    }

    & .capability-title {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--main-color);
      margin-bottom: 0.5rem;
      letter-spacing: 0.05em;
    }

    & .capability-desc {
      font-size: 1rem;
      color: var(--text-color);
      line-height: 1.5;
      margin-bottom: 0.75rem;
    }

    & .capability-features {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.3rem;

      & li {
        font-size: 1rem;
        font-weight: 500;
        color: var(--text-color);
        padding-left: 1rem;
        position: relative;
        line-height: 1.5;

        &::before {
          content: ">";
          position: absolute;
          left: 0;
          color: #fff;
          font-weight: 700;
        }
      }
    }

    @media (max-width: 64rem) {
      flex-direction: column;
      opacity: 1;
      transform: none;
      transition: box-shadow 0.3s;
    }
  }
}

/* ===== CASE STUDY SECTION ===== */
.kdg-case-study {
  background-image:
    linear-gradient(135deg, rgba(196, 198, 205, 0.1), rgba(180, 175, 200, 0.4)),
    url("/content/dam/kddi-com/biz/digitalgate/2026/img/img-bg-casestudy-00.png");
  background-attachment: fixed;
  background-size: cover;
  background-position: center;

  & .section-title {
    padding-right: 0.5rem;
    text-align: right;
    font-size: clamp(3.5rem, 8vw, 10rem);
  }

  & .case-list {
    display: flex;
    flex-direction: column;
    gap: 4rem;
    margin-bottom: 6rem;
  }

  & .case-item {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition:
      box-shadow 0.3s,
      scale 0.3s;

    &.reverse {
      flex-direction: row-reverse;
    }

    & img {
      width: 28rem;
      flex: none;
      height: 20rem;
      object-fit: cover;
      position: relative;
      overflow: hidden;

      &::after {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(
          135deg,
          rgba(255, 255, 255, 0.08) 0%,
          transparent 50%
        );
        border-radius: 1rem;
        pointer-events: none;
      }
    }

    & .case-info {
      flex: 1;
      & h3 {
        font-size: 1.75rem;
        margin: 0 0 5rem 1.25rem;
      }
      & p {
        margin: 1.25rem;
        color: #666;
      }
    }

    &:hover {
      box-shadow: 0 1rem 2rem rgba(30, 40, 75, 0.2);
    }
  }

  /* タブレット: 画像幅を縮小 */
  @media (max-width: 64rem) {
    & .case-item {
      gap: 2rem;

      & img {
        width: 22rem;
        height: 16rem;
      }

      & .case-info h3 {
        font-size: 1.6rem;
      }
    }
  }

  /* モバイル: 縦積みレイアウト */
  @media (max-width: 48rem) {
    & .case-list {
      gap: 4rem;
    }

    & .case-item {
      flex-direction: column;
      gap: 1.5rem;

      &.reverse {
        flex-direction: column;
      }

      & img {
        width: 100%;
        height: 14rem;
      }

      & .case-info h3 {
        font-size: 1.4rem;
      }
    }
  }
}

/* ===== MEMBER SECTION (Glass Cards) ===== */
.kdg-member {
  background-color: var(--bg-color);
  background-image:
    linear-gradient(135deg, rgba(200, 202, 208, 0), rgba(220, 210, 225, 0.3)),
    url("/content/dam/kddi-com/biz/digitalgate/2026/img/img-bg-member-00.png");
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  text-align: center;
  position: relative;

  & .section-title {
    text-align: left;
    font-size: clamp(3.5rem, 11vw, 12rem);
    letter-spacing: -0.125em;
    margin-left: -3rem;

    @media (max-width: 48rem) {
      margin-left: 0;
      text-align: center;
    }
  }

  & .member-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    max-width: 100%;
    position: relative;
    z-index: 1;

    & .hidden-member {
      display: none;
    }

    @media (max-width: 75rem) {
      grid-template-columns: repeat(3, 1fr);
    }

    @media (max-width: 48rem) {
      grid-template-columns: repeat(2, 1fr);
      gap: 0.9375rem;
    }

    @media (max-width: 30rem) {
      grid-template-columns: 1fr;
    }
  }

  & .member-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    padding: 0;
    border-radius: 0.5rem;
    text-align: left;
    box-shadow: var(--glass-shadow);
    display: flex;
    flex-direction: column;
    color: inherit;
    transition:
      opacity 0.3s,
      box-shadow 0.3s,
      scale 0.3s;
    cursor: pointer;
    position: relative;
    overflow: hidden;

    &:hover {
      scale: 1.05;
      opacity: 0.9;
      box-shadow: 0 12px 36px rgba(30, 30, 40, 0.12);
    }
  }

  & .member-photo {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    display: block;
    background-color: #d8dae0;
  }

  & h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 1.5rem 0 0.5rem 1.5rem;
  }
  & p {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-subtle);
    margin: 0 1.5rem 1.5rem 1.5rem;
  }
}

& .toggle-checkbox {
  display: none;
}

& #toggle-members:checked {
  & ~ .member-grid .hidden-member {
    display: block;
  }
  & ~ .member-toggle-area {
    & .show-more {
      display: none;
    }
    & .show-less {
      display: inline;
    }
  }
}

& .btn-toggle {
  display: inline-block;
  padding: 1.5px; /* Border thickness for the effect */
  color: #fff;
  border-radius: 2rem;
  cursor: pointer;
  transition:
    box-shadow 0.3s,
    scale 0.3s;
  user-select: none;
  position: relative;
  overflow: hidden;
  line-height: 1;

  & > span {
    display: block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--main-color), #0599e6);
    border-radius: 2rem;
    position: relative;
    z-index: 2;
  }

  &:hover {
    scale: 1.05;
    box-shadow: 0 6px 24px rgba(40, 90, 95, 0.1);
  }

  & .show-less {
    display: none;
  }
}

/* ===== MODAL (Glass Enhanced) ===== */
.kdg-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(6, 11, 24, 0.6);
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.4s,
    visibility 0.4s;
  justify-content: center;
  align-items: center;
  padding: 1.25rem;
  backdrop-filter: blur(0.5rem);
  -webkit-backdrop-filter: blur(0.5rem);

  & .is-active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    & .kdg-modal-content {
      transform: scale(1) translateY(0);
    }
  }

  & .kdg-modal-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    cursor: default;
  }

  & .kdg-modal-content {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(2rem) saturate(180%);
    -webkit-backdrop-filter: blur(2rem) saturate(180%);
    width: 100%;
    max-width: 37.5rem;
    border-radius: 1.5rem;
    position: relative;
    box-shadow:
      0 24px 64px rgba(0, 0, 0, 0.2),
      0 0 0 1px rgba(255, 255, 255, 0.3) inset;
    text-align: left;
    transform: scale(0.92) translateY(1rem);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(255, 255, 255, 0.7);

    @media (max-width: 48rem) {
      width: 92%;
    }
  }

  & .kdg-modal-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    line-height: 0;
    padding-bottom: 0.4rem;
    color: #fff;
    background: rgba(0, 0, 0, 0.35);
    border-radius: 50%;
    text-decoration: none;
    z-index: 10;
    transition:
      background 0.25s,
      transform 0.3s;

    &:hover {
      background: rgba(0, 0, 0, 0.65);
      transform: scale(1.1);
    }
  }

  & .kdg-modal-scroll {
    overflow-y: auto;
    flex: 1;
  }
  & .kdg-modal-photo {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    display: block;
    background-color: #d8dae0;
  }

  & .kdg-modal-inner {
    padding: 1.5rem 2rem 2rem;
    @media (max-width: 48rem) {
      padding: 1.25rem 1.25rem 1.5rem;
    }
  }

  & .kdg-modal-header {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding-bottom: 1.5rem;
    & h3 {
      font-size: 1.5rem;
      color: var(--text-color);
      margin-bottom: 0.4rem;
    }
  }

  & .kdg-modal-role {
    color: var(--text-subtle);
    font-weight: 600;
    font-size: 1rem;
  }
  & .kdg-modal-body {
    line-height: 1.8;
    color: var(--text-color);
  }
}

/* ===== LOCATION SECTION (Glass Cards) ===== */
.kdg-location {
  background-color: #c4c6cd;
  background-image:
    linear-gradient(135deg, rgba(196, 198, 205, 0.4), rgba(196, 198, 205, 0.8)),
    url("/content/dam/kddi-com/biz/digitalgate/2026/img/img-bg-location-00.png");
  background-attachment: fixed;
  background-size: cover;
  background-position: center;

  & .section-title {
    text-align: center;
    font-size: clamp(3rem, 5vw, 7rem);
    letter-spacing: -0.025em;
  }

  & .location-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(18.75rem, 1fr));
    gap: 2.5rem;
  }

  & .location-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: var(--glass-shadow);
    transition:
      scale 0.3s,
      box-shadow 0.3s;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;

    &:hover {
      box-shadow: 0 12px 36px rgba(30, 30, 50, 0.1);
    }
  }

  & h3 {
    font-size: 1.8rem;
    margin-bottom: 0.75rem;
    border-left: 0.25rem solid var(--accent-color);
    padding-left: 1rem;
  }

  & p {
    margin-bottom: 1.25rem;
    color: var(--text-color);
  }

  & img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
  }
}

/* iOS Safari では background-attachment:fixed が機能しないためscrollにフォールバック */
@supports (-webkit-touch-callout: none) {
  .kdg-hero,
  .kdg-topics-section,
  .kdg-statement,
  .kdg-service,
  .kdg-case-study,
  .kdg-member,
  .kdg-location {
    background-attachment: scroll;
  }
}