:root {
  --bg-color: #000000;
  --bg-secondary: #121212;
  --text-color: #ffffff;
  --text-muted: #999999;
  --accent-color: #333333;
  --highlight-color: #0099ff;

  --font-base:
    "Helvetica Neue",
    Arial,
    "Hiragino Kaku Gothic ProN",
    "Hiragino Sans",
    Meiryo,
    sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-base);
  line-height: 1.8;
  letter-spacing: 0.05em;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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


/* header */
/* header */
/* header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;

  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;

  width: 100%;
  min-height: 70px;

  padding: 0 2rem;

  background-color: rgb(0 0 0 / 85%);
  border-bottom: 1px solid var(--accent-color);

  backdrop-filter: blur(10px);
}

.site-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-logo-main {
  font-size: 1.2rem;
  font-weight: 800;
}

.site-logo-sub {
  margin-top: 0.3rem;

  color: #777;
  font-size: 0.65rem;
  font-weight: normal;
}

.site-description {
  display: none;
}

.global-nav-list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.global-nav-list a {
  display: block;

  padding: 0.6rem 0.8rem;

  color: #aaa;
  font-size: 0.8rem;
  font-weight: bold;

  border-radius: 4px;

  transition:
    color 0.3s ease,
    background-color 0.3s ease;
}

.global-nav-list a:hover {
  color: #fff;
  background-color: rgb(255 255 255 / 10%);
}


/* section */
/* section */
/* section */

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

.section-inner {
  width: min(900px, 90%);
  margin: 0 auto;
  padding: 6rem 0;
}

.section-title {
  margin-bottom: 3rem;

  padding-left: 1.2rem;

  font-size: 2.5rem;
  font-weight: 200;
  line-height: 1;

  letter-spacing: 0.2em;

  border-left: 4px solid #fff;
}

.content-block + .content-block {
  margin-top: 3rem;
}

.content-block h2 {
  margin-bottom: 1rem;
  font-size: 1.4rem;
}

.content-block p {
  color: #ccc;
}


/* theme */
/* theme */
/* theme */

.section-catch {
  margin-bottom: 3rem;

  font-size: 1.6rem;
  font-weight: bold;
}

.theme-list {
  display: grid;
  gap: 1.5rem;
}

.theme-list li {
  padding: 1.5rem;

  background-color: var(--bg-secondary);
  border: 1px solid #222;

  transition:
    transform 0.3s ease,
    border-color 0.3s ease;
}

.theme-list li:hover {
  transform: translateY(-3px);
  border-color: #555;
}

.theme-list strong {
  display: block;

  margin-bottom: 0.8rem;

  font-size: 1.1rem;
}

.theme-list p {
  color: #bbb;
}


/* target */
/* target */
/* target */

.target-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.target-card {
  padding: 2rem;

  background-color: var(--bg-secondary);
  border: 1px solid #222;

  transition:
    transform 0.3s ease,
    border-color 0.3s ease;
}

.target-card:hover {
  transform: translateY(-3px);
  border-color: #555;
}

.target-card h3 {
  margin-bottom: 0.2rem;

  font-size: 1.5rem;
  letter-spacing: 0.1em;
}

.target-label {
  margin-bottom: 1.5rem;

  color: var(--text-muted);
  font-size: 0.85rem;
}

.target-card ul {
  display: grid;
  gap: 0.8rem;
}

.target-card li {
  position: relative;

  padding-left: 1rem;

  color: #ccc;
}

.target-card li::before {
  content: "";

  position: absolute;
  top: 0.75em;
  left: 0;

  width: 4px;
  height: 4px;

  background-color: #fff;
}


/* persona */
/* persona */
/* persona */

.persona-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.persona-item {
  overflow: hidden;

  border: 1px solid #222;
  border-radius: 10px;
}

.persona-item img {
  width: 100%;

  transition: transform 0.3s ease;
}

.persona-item:hover img {
  transform: scale(1.03);
}


/* system */
/* system */
/* system */

.app-heading {
  margin-bottom: 5rem;

  padding: 2rem;

  background-color: var(--bg-secondary);
  border-left: 3px solid #fff;
}

.app-name {
  margin-bottom: 1rem;

  font-size: 2rem;
  font-weight: bold;
}

.app-catch {
  margin-bottom: 1.5rem;

  font-size: 1.3rem;
}

.app-heading > p:not(.app-name, .app-catch) {
  color: #bbb;
}

.app-main-image {
  width: 100%;

  margin-top: 2rem;

  border-radius: 10px;
}


.system-group {
  margin-bottom: 6rem;
}

.system-group > h3 {
  display: flex;
  align-items: baseline;
  gap: 1rem;

  margin-bottom: 1.5rem;

  padding-bottom: 0.8rem;

  font-size: 2rem;

  border-bottom: 1px solid #333;
}

.system-group > h3 span {
  color: #888;
  font-size: 1rem;
  font-weight: normal;
}

.system-description {
  margin-bottom: 2rem;

  color: #999;
}


/* feature */

.feature-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;

  margin-bottom: 2rem;
  padding: 2rem;

  background-color: #0a0a0a;
  border: 1px solid #222;

  transition:
    transform 0.3s ease,
    border-color 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: #555;
}

.feature-number {
  margin-bottom: 0.5rem;

  color: #666;
  font-size: 0.85rem;
}

.feature-content h4 {
  margin-bottom: 1rem;

  font-size: 1.3rem;
}

.feature-content h4 span {
  display: block;

  margin-top: 0.3rem;

  color: #888;
  font-size: 0.9rem;
  font-weight: normal;
}

.feature-content p {
  color: #bbb;
}

.feature-image {
  width: 100%;

  border-radius: 8px;
}

.system-image {
  width: 100%;

  border-radius: 10px;
}


/* app demo */
/* app demo */
/* app demo */

.app-demo {
  margin-top: 6rem;
  text-align: center;
}

.app-demo h3 {
  margin-bottom: 2rem;

  font-size: 1.8rem;
}

.phone-mockup {
  position: relative;

  width: 375px;
  height: 650px;

  margin: 0 auto;
  padding: 12px;

  background-color: #000;

  border: 4px solid #333;
  border-radius: 40px;

  box-shadow: 0 20px 50px rgb(0 0 0 / 30%);
}

.phone-mockup::before {
  content: "";

  position: absolute;
  top: 0;
  left: 50%;
  z-index: 10;

  width: 150px;
  height: 25px;

  transform: translateX(-50%);

  background-color: #000;

  border-radius: 0 0 16px 16px;
}

.phone-screen {
  width: 100%;
  height: 100%;

  border: none;
  border-radius: 30px;

  background-color: #fff;
}


/* conclusion */
/* conclusion */
/* conclusion */

.section-conclusion {
  border-bottom: none;
  text-align: center;
}

.conclusion-catch {
  margin-bottom: 2rem;

  font-size: 2rem;
  font-weight: bold;
  line-height: 1.5;
}

.section-conclusion p {
  max-width: 700px;

  margin: 0 auto 1.5rem;

  color: #ccc;
}

.conclusion-message {
  margin-top: 3rem !important;

  color: #fff !important;
  font-size: 1.15rem;
  font-weight: bold;
}


/* footer */
/* footer */
/* footer */

.site-footer {
  padding: 3rem;

  background-color: var(--bg-secondary);

  color: #555;
  font-size: 0.8rem;

  text-align: center;
}


/* responsive */
/* responsive */
/* responsive */

@media screen and (max-width: 768px) {

  .site-header {
    flex-direction: column;

    padding: 1rem;

    gap: 1rem;
  }

  .site-logo {
    align-items: center;
    text-align: center;
  }

  .global-nav-list {
    justify-content: center;
    flex-wrap: wrap;
  }

  .global-nav-list a {
    padding: 0.4rem 0.6rem;

    font-size: 0.7rem;
  }


  .section-inner {
    width: min(92%, 700px);
    padding: 4rem 0;
  }

  .section-title {
    margin-bottom: 2rem;

    font-size: 2rem;
  }

  .section-catch {
    font-size: 1.3rem;
  }


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


  .persona-gallery {
    grid-template-columns: 1fr;
  }


  .feature-card {
    grid-template-columns: 1fr;
  }


  .system-group > h3 {
    flex-direction: column;
    gap: 0.2rem;
  }


  .phone-mockup {
    width: min(100%, 375px);
    height: 620px;
  }


  .conclusion-catch {
    font-size: 1.5rem;
  }
}


@media screen and (max-width: 480px) {

  .section-inner {
    padding: 3rem 0;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .target-card,
  .feature-card,
  .app-heading {
    padding: 1.3rem;
  }

  .app-name {
    font-size: 1.5rem;
  }

  .phone-mockup {
    height: 560px;

    border-radius: 32px;
  }

  .phone-screen {
    border-radius: 24px;
  }
}