:root {
  --bg: #f6f6f6;
  --surface: #ffffff;
  --text: #1f1f22;
  --muted: #6f6f75;
  --line: #e2e2e5;
  --accent: #08090a;
  --max: 1200px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Noto Sans JP", sans-serif;
  background: var(--bg);
  line-height: 1.8;
}

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

h1,
h2,
h3,
.logo {
  font-family: "Noto Serif JP", serif;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.container {
  width: min(100% - 32px, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 246, 246, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  height: 84px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.logo {
  font-size: 2.6rem;
  text-decoration: none;
  color: var(--text);
  white-space: nowrap;
}

.gnav {
  margin-left: auto;
  display: flex;
  align-items: center;
}

.gnav a {
  display: inline-flex;
  align-items: center;
  font-size: 1.35rem;
  color: #3f3f45;
  text-decoration: none;
  white-space: nowrap;
}

.gnav a + a {
  margin-left: 24px;
}


.mobile-quick-links {
  display: none;
}
.mobile-drawer {
  display: none;
}


.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  min-height: 60px;
  padding: 0 30px;
  font-size: 1.6rem;
  letter-spacing: 0.06em;
}

.btn::after {
  content: "→";
  margin-left: 10px;
}

.btn-sm {
  min-height: 52px;
  font-size: 1.4rem;
  padding: 0 18px;
}

.menu-btn {
  display: none;
  background: transparent;
  border: 0;
  font-size: 2.8rem;
  color: #444;
}

.hero {
  padding: 20px 0 34px;
}

.hero .container {
  width: min(100% - 32px, 1320px);
}

.hero-grid {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: 10px;
  align-items: stretch;
}

.hero-copy {
  padding-top: 56px;
  max-width: 560px;
  position: relative;
  z-index: 2;
}

.kicker {
  font-size: 4rem;
  margin: 0;
}

h1 {
  font-size: clamp(7.2rem, 8.2vw, 11.4rem);
  line-height: 1.05;
  margin: 10px 0 20px;
}

.lead {
  font-size: 3.6rem;
  margin: 0 0 10px;
  line-height: 1.45;
}

.sub {
  font-size: 1.9rem;
  color: #5f5f66;
  margin: 0 0 26px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

.stats > div {
  border-left: 1px solid var(--line);
  padding-left: 16px;
}

.stats-label {
  margin: 0;
  color: var(--muted);
  font-size: 1.4rem;
}

.stats-num {
  margin: 5px 0;
  font-size: 5rem;
  line-height: 1.1;
  font-family: "Noto Serif JP", serif;
}

.hero-visual {
  min-height: 780px;
  position: relative;
  border-radius: 0;
  overflow: hidden;
  background: linear-gradient(140deg, #fbfbfc 0%, #f3f3f6 55%, #efeff2 100%);
  border: 0;
}

.portrait {
  position: absolute;
  inset: -2% 8% -2% -8%;
  background-image: url("./assets/zero_gra_wave_main_visual_web_transparent.png");
  background-repeat: no-repeat;
  background-position: 58% bottom;
  background-size: 108% auto;
}

.machine {
  position: absolute;
  right: -24%;
  bottom: -10%;
  width: 80%;
  aspect-ratio: 1/1;
  background-image: url("./assets/machine_full_transparent.png");
  background-repeat: no-repeat;
  background-position: center bottom;
  background-size: contain;
}

.section-block {
  padding: 54px 0;
  border-top: 1px solid var(--line);
}

.section-label {
  margin: 0;
  font-size: 1.3rem;
  letter-spacing: 0.18em;
  color: #8b8b90;
}

h2 {
  margin: 8px 0 24px;
  font-size: clamp(3.4rem, 4.8vw, 5.4rem);
  line-height: 1.4;
}

.problem-grid,
.feature-grid,
.results-grid,
.benefit-grid {
  display: grid;
  gap: 18px;
}

.problem-grid,
.feature-grid,
.results-grid {
  grid-template-columns: repeat(4, 1fr);
}

.tile,
.card,
.voice {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 10px;
}

.tile p,
.card p,
.voice p {
  font-size: 1.6rem;
  margin: 10px 6px 4px;
}

.thumb,
.voice-photo {
  aspect-ratio: 4 / 3;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.problem-1 {
  background-image: url("./assets/zero_gra_wave_problem_01_web_transparent.png");
  background-color: #f2f2f2;
  background-size: contain;
}

.problem-2 {
  background-image: url("./assets/zero_gra_wave_problem_02_web_transparent.png");
  background-color: #f2f2f2;
  background-size: contain;
}

.problem-3 {
  background-image: url("./assets/zero_gra_wave_problem_05_web_transparent.png");
  background-color: #f2f2f2;
}

.problem-4 {
  background-image: url("./assets/zero_gra_wave_problem_04_web_transparent.png");
  background-color: #f2f2f2;
  background-size: contain;
}

.feature-1 { background-image: url("./assets/machine_structure_detail.png"); }
.feature-2 { background-image: url("./assets/machine_cable_detail.png"); }
.feature-3 { background-image: url("./assets/machine_lllt_unit.png"); }
.feature-4 { background-image: url("./assets/machine_sensor_panel.png"); }

.voice-1 { background-image: url("./assets/zero_gra_wave_problem_01_web_transparent.png"); }
.voice-2 { background-image: url("./assets/zero_gra_wave_problem_02_web_transparent.png"); }
.voice-3 { background-image: url("./assets/zero_gra_wave_problem_04_web_transparent.png"); }
.voice-4 { background-image: url("./assets/zero_gra_wave_main_visual_web_transparent.png"); }

.solution-wrap {
  border: 1px solid var(--line);
  background: linear-gradient(#fbfbfb, #f1f2f5);
  padding: 22px;
}

.solution-top {
  display: grid;
  grid-template-columns: 0.95fr 1.35fr;
  gap: 18px;
  align-items: end;
}

.solution-head p {
  font-size: 1.7rem;
  color: #57575d;
}

.solution-machine {
  height: 380px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background-color: #eef1f4;
  background-image: url("./assets/zero_gra_wave_problem_06_web_transparent.png");
  background-position: center 58%;
  background-size: cover;
  background-repeat: no-repeat;
}

.benefit-grid {
  grid-template-columns: repeat(4, 1fr);
  margin-top: 18px;
}

.benefit-grid article {
  background: #f8f8f9;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px 14px;
}

.benefit-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  align-items: start;
}

.benefit-item img {
  width: 46px;
  height: 46px;
}

.benefit-grid h3 {
  font-size: 2.8rem;
  margin: 0 0 6px;
  line-height: 1.4;
}

.benefit-grid p {
  margin: 0;
  font-size: 1.4rem;
  color: var(--muted);
}

.btn-wide {
  width: min(520px, 100%);
  margin: 20px auto 0;
}

.text-link {
  margin: 18px auto 0;
  display: block;
  width: fit-content;
  color: var(--text);
  text-decoration: none;
  font-size: 2.2rem;
}

.results h2 {
  margin-bottom: 14px;
  text-align: center;
}

.results .section-label {
  text-align: center;
}

.results-intro {
  margin: 0 0 24px;
  text-align: center;
  color: #4f4f56;
  font-size: 2rem;
}

.results-grid .voice {
  background: #f8f8f9;
  border: 1px solid var(--line);
  padding: 22px 18px;
}

.results-grid .voice .result-metric {
  margin: 0;
  font-family: "Noto Serif JP", serif;
  display: flex;
  align-items: flex-end;
  gap: 0.06em;
  white-space: nowrap;
  font-size: clamp(6.8rem, 5vw, 11rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.01em;
}

.results-grid .voice .result-metric span {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.48em;
  font-weight: 700;
  line-height: 1.05;
}

.results-grid .voice .result-label {
  margin: 6px 0 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid #d7d7db;
  color: #4f4f56;
  font-size: 2rem;
}

.results-grid .voice .result-owner {
  margin: 0 0 12px;
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.45;
}

.results-grid .voice .result-quote {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.85;
  color: #3a3a40;
}

.cta-last {
  margin-top: 28px;
}

.faq h2 {
  margin: 0 0 26px;
  font-size: clamp(4.2rem, 5.2vw, 7rem);
  line-height: 1.2;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-group-title {
  margin: 0;
  padding: 20px 0 10px;
  font-family: "Noto Serif JP", serif;
  font-size: 2.4rem;
  font-weight: 600;
  color: #2a2a30;
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 26px 0;
  cursor: pointer;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-question {
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.45;
}

.faq-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid #d3d3d8;
  position: relative;
  flex-shrink: 0;
}

.faq-toggle::before,
.faq-toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: #121216;
  transform: translate(-50%, -50%);
}

.faq-toggle::before {
  width: 16px;
  height: 2px;
}

.faq-toggle::after {
  width: 2px;
  height: 16px;
}

.faq-item[open] .faq-toggle::after {
  display: none;
}

.faq-answer {
  padding: 0 64px 24px 0;
  color: #44444b;
  font-size: 2rem;
  line-height: 1.9;
}

.faq-answer ul {
  margin: 10px 0 0 1.2em;
  padding: 0;
}

.faq-answer li {
  margin: 6px 0;
}

.sns h2 {
  margin: 8px 0 20px;
}

.sns-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.sns-card {
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px solid var(--line);
  background: #f8f8f9;
  color: var(--text);
  text-decoration: none;
  padding: 16px 18px;
}

.sns-card img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.sns-card span {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

html {
  font-size: 62.5%;
}

@media (max-width: 980px) {
  .header-inner {
    height: 70px;
    gap: 12px;
  }

  .logo {
    font-size: 2.4rem;
  }

  .gnav,
  .btn-sm {
    display: none;
  }

  .mobile-quick-links {
    display: flex !important;
    gap: 12px;
    margin-left: auto;
  }

  .mobile-quick-links a {
    font-size: 1.3rem;
    text-decoration: none;
    color: #3f3f45;
  }


  .mobile-drawer {
    position: fixed;
    top: 70px;
    right: 10px;
    left: 10px;
    display: none;
    flex-direction: column;
    gap: 2px;
    padding: 10px;
    background: rgba(248, 248, 250, 0.98);
    border: 1px solid var(--line);
    z-index: 25;
  }

  body.menu-open .mobile-drawer {
    display: flex;
  }

  body.menu-open {
    overflow: hidden;
  }

  .mobile-drawer a {
    display: block;
    text-decoration: none;
    color: #2e2e34;
    padding: 10px 8px;
    font-size: 1.5rem;
    border-bottom: 1px solid #e3e3e7;
  }

  .mobile-drawer a:last-child {
    border-bottom: 0;
  }

  .mobile-drawer .mobile-drawer-contact {
    margin-top: 6px;
    background: #08090a;
    color: #fff;
    text-align: center;
    border-bottom: 0;
  }

  .hero-grid,
  .problem-grid,
  .feature-grid,
  .results-grid,
  .benefit-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 12px 0 30px;
  }

  .hero-copy {
    padding-top: 0;
    max-width: none;
  }

  .hero-visual {
    min-height: 520px;
    order: -1;
    margin-bottom: 8px;
  }

  .kicker {
    font-size: 2.5rem;
  }

  h1 {
    font-size: clamp(6rem, 12vw, 8.4rem);
    margin-bottom: 12px;
  }

  .lead {
    font-size: 2.7rem;
  }

  .portrait {
    inset: 2% -6% -2% -10%;
    background-position: 60% 6%;
    background-size: 108% auto;
  }

  .machine {
    right: -30%;
    bottom: -14%;
    width: 96%;
  }

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

  .stats-num {
    font-size: 3.8rem;
  }

  .solution-machine {
    height: 260px;
    background-position: center;
  }

  .solution-top {
    grid-template-columns: 1fr;
  }

  .benefit-item {
    grid-template-columns: 40px 1fr;
    gap: 10px;
  }

  .benefit-item img {
    width: 38px;
    height: 38px;
  }

  .benefit-grid h3 {
    font-size: 2.2rem;
  }

  .section-block {
    padding: 36px 0;
  }

  h2 {
    font-size: 4rem;
  }

  .tile {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 12px;
    align-items: center;
  }

  .tile p,
  .voice p {
    margin: 0;
  }

  .feature-grid .card {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 12px;
    align-items: center;
  }

  .feature-grid .card .thumb {
    width: 110px;
    justify-self: start;
  }

  .feature-grid .card h3 {
    margin: 0 0 6px;
    font-size: 2rem;
    line-height: 1.45;
  }

  .feature-grid .card p {
    margin: 0;
    font-size: 1.5rem;
    line-height: 1.65;
  }

  .results-intro {
    font-size: 1.6rem;
    margin-bottom: 16px;
  }

  .results-grid .voice {
    padding: 16px 14px;
  }

  .results-grid .voice .result-metric {
    font-size: 7.2rem;
  }

  .results-grid .voice .result-label {
    font-size: 1.6rem;
    padding-bottom: 10px;
    margin-bottom: 10px;
  }

  .results-grid .voice .result-owner {
    font-size: 1.7rem;
    margin-bottom: 8px;
  }

  .results-grid .voice .result-quote {
    font-size: 1.5rem;
    line-height: 1.75;
  }

  .faq h2 {
    font-size: 4.2rem;
    margin-bottom: 16px;
  }

  .faq-item summary {
    padding: 16px 0;
    gap: 10px;
  }

  .faq-group-title {
    font-size: 1.9rem;
    padding: 16px 0 8px;
  }

  .faq-question {
    font-size: 1.9rem;
    line-height: 1.45;
  }

  .faq-toggle {
    width: 34px;
    height: 34px;
  }

  .faq-answer {
    font-size: 1.5rem;
    line-height: 1.75;
    padding: 0 0 16px 0;
  }

  .sns-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .sns-card {
    padding: 12px 14px;
  }

  .sns-card img {
    width: 40px;
    height: 40px;
  }

  .sns-card span {
    font-size: 1.8rem;
  }
}