/* ==========================================================
   subzero.co.jp
   モバイルファースト。768px〜 タブレット、1100px〜 PC
   ========================================================== */

:root {
  /* ロゴの青から取った色。brand-deep = シンボルマーク、brand = ロゴ文字の中間色 */
  --brand-deep: #014b87;
  --brand: #0068a2;
  --ink: #0c3a64;
  --ink-hover: var(--brand);
  --sub: #4a6480;
  --muted: #86a0b8;
  --line: #c8d7e5;
  --bg: #ffffff;

  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  --font-mincho: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-serif: "Bodoni Moda", "Didot", "Bodoni 72", serif;

  /* 左はセクションの縦書きラベルぶん空ける */
  --pad-left: 56px;
  --pad-right: 20px;
  --pad-edge: 20px;
  --section-gap: 120px;
  --label-left: 18px;
}

@media (min-width: 768px) {
  :root {
    --pad-left: 120px;
    --pad-right: 48px;
    --pad-edge: 40px;
    --section-gap: 160px;
    --label-left: 40px;
  }
}

@media (min-width: 1100px) {
  :root {
    --pad-left: 200px;
    --pad-right: 200px;
    --pad-edge: 64px;
    --section-gap: 200px;
    --label-left: 64px;
  }
}

/* ---------- base ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* iOS Safari は body の overflow-x を無視してページごと縮小表示するので、html にも指定する。
   clip はスクロール領域を作らないので position: sticky なども壊さない */
html,
body {
  overflow-x: hidden;
  overflow-x: clip;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

body > * {
  max-width: 1440px;
  margin-inline: auto;
}

a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--ink-hover);
}

a:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 4px;
}

h1,
h2,
p,
ul,
dl,
dd {
  margin: 0;
}

ul {
  padding: 0;
  list-style: none;
}

.pc-only {
  display: none;
}

@media (min-width: 1100px) {
  .pc-only {
    display: inline;
  }
  .sp-only {
    display: none;
  }
}

/* ---------- header ---------- */

.site-header {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 16px var(--pad-edge) 4px;
}

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

.logo {
  display: block;
  padding: 8px 0;
  line-height: 0;
}

.logo img {
  width: auto;
  height: 28px;
}

.site-nav {
  display: flex;
  gap: 24px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
}

.site-nav a {
  padding: 14px 0;
}

@media (min-width: 768px) {
  .site-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    height: 96px;
    padding-block: 0;
  }
  .logo img {
    height: 34px;
  }
  .site-nav {
    gap: 48px;
    font-size: 12px;
    letter-spacing: 0.2em;
  }
}

/* ---------- 共通：セクション ---------- */

.section,
.hero {
  position: relative;
  padding: 0 var(--pad-right) var(--section-gap) var(--pad-left);
}

.section-label {
  position: absolute;
  top: 8px;
  left: var(--label-left);
  writing-mode: vertical-rl;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.24em;
  line-height: 1;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.section-title {
  font-family: var(--font-mincho);
  font-weight: 500;
  font-size: clamp(26px, 3.1vw, 44px);
  line-height: 1.7;
  letter-spacing: 0.04em;
}

.note {
  color: var(--sub);
  font-size: 12px;
  line-height: 2.2;
}

@media (min-width: 768px) {
  .section-label {
    font-size: 12px;
  }
  .section-head {
    gap: 28px;
  }
  .section-title {
    line-height: 1.6;
  }
  .note {
    font-size: 13px;
  }
}

@media (min-width: 1100px) {
  .section {
    padding-top: 40px;
  }
  .section-label {
    top: 48px;
  }
}

/* 細線付きの矢印ラベル（VIEW MORE / OPEN / COMING SOON） */
.more {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 140px;
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  line-height: 1.4;
}

.more::after {
  content: "";
  display: block;
  height: 1px;
  background: currentColor;
  transform-origin: left;
  transition: transform 0.3s ease;
}

a:hover .more::after {
  transform: scaleX(1.15);
}

@media (min-width: 768px) {
  .more {
    gap: 10px;
    width: 200px;
    font-size: 12px;
  }
}

/* ---------- hero ---------- */

.hero {
  display: flex;
  flex-direction: column;
  gap: 72px;
  padding-top: 140px;
  padding-bottom: 120px;
}

.hero .section-label {
  top: 150px;
}

/* 幅を文字に合わせておかないと、斜体（skew）で傾けたぶん枠が右にはみ出す */
.hero-title {
  display: flex;
  flex-direction: column;
  width: fit-content;
  font-family: var(--font-mincho);
  font-weight: 500;
  font-size: clamp(24px, 7.6vw, 88px);
  line-height: 1.55;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transform: skewX(-12deg);
  transform-origin: left bottom;
}

.hero-title-indent {
  padding-left: 0.8em;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: clamp(48px, 6.1vw, 88px);
  }
  .hero-title-indent {
    padding-left: 1.4em;
  }
}

.hero-body {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 560px;
}

.hero-lead {
  font-size: 16px;
  font-weight: 500;
  line-height: 2;
}

@media (min-width: 768px) {
  .hero {
    gap: 96px;
    padding-top: 160px;
  }
  .hero .section-label {
    top: 240px;
  }
  .hero-lead {
    font-size: 18px;
  }
}

@media (min-width: 1100px) {
  .hero {
    gap: 120px;
    min-height: 1040px;
    padding-top: 180px;
    padding-bottom: 160px;
  }
  .hero .section-label {
    top: 380px;
  }
  .hero-title-indent {
    padding-left: 280px;
  }
  .hero-body {
    gap: 28px;
  }
  .hero-lead {
    font-size: 20px;
  }
}

/* ---------- slogan ---------- */

.slogan {
  padding: 0 var(--pad-edge) var(--section-gap);
}

.slogan p {
  display: flex;
  flex-direction: column;
  color: var(--brand);
  font-family: var(--font-serif);
  /* スマホは画面幅に比例させる（320px 幅でも「CHALLENGE,」が収まるように） */
  font-size: clamp(36px, 12.4vw, 64px);
  line-height: 1.04;
  letter-spacing: 0.01em;
}

@media (min-width: 768px) {
  .slogan p {
    font-size: clamp(64px, 10.4vw, 150px);
  }
}

.slogan-end {
  align-self: flex-end;
  text-align: right;
}

/* ---------- business ---------- */

#business {
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.biz {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 40px 0;
  border-top: 1px solid var(--line);
  color: var(--ink);
}

.biz-list li:last-child .biz {
  border-bottom: 1px solid var(--line);
}

.biz-name {
  font-family: var(--font-serif);
  font-size: clamp(40px, 6.7vw, 96px);
  line-height: 1.08;
}

/* ロゴがある事業は英字見出しの代わりにロゴを置く（高さを英字のキャップハイトに揃える） */
.biz-logo {
  display: block;
  width: auto;
  height: clamp(30px, 5vw, 72px);
  margin-block: 0.12em;
}

/* 2段組みのロゴ（ZEROWA mobile）は横組みより背を高くして、見た目の大きさを揃える */
.biz-logo--stacked {
  height: clamp(60px, 8.4vw, 120px);
}

.biz-foot {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.biz-text {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12px;
  line-height: 2;
}

.biz-label {
  font-weight: 500;
}

.biz-desc {
  color: var(--sub);
}

.biz .more {
  align-self: flex-end;
  padding-top: 8px;
}

.biz.is-soon .more {
  color: var(--muted);
}

@media (min-width: 768px) {
  .biz {
    gap: 28px;
    padding: 64px 0;
  }
  .biz-foot {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
    gap: 48px;
  }
  .biz-text {
    font-size: 13px;
  }
  .biz .more {
    padding-top: 0;
  }
}

@media (min-width: 1100px) {
  #business {
    gap: 96px;
  }
  .biz .more {
    width: 220px;
  }
}

/* ---------- company ---------- */

#company {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.company {
  max-width: 840px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  line-height: 2;
}

.company > div {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.company dt {
  font-size: 11px;
  font-weight: 500;
}

.company dd {
  margin-top: 2px;
}

.company dd a {
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 4px;
}

@media (min-width: 768px) {
  #company {
    gap: 80px;
  }
  .company {
    font-size: 14px;
  }
  .company > div {
    display: grid;
    grid-template-columns: 180px 1fr;
    padding: 24px 0;
  }
  .company dt {
    font-size: inherit;
  }
  .company dd {
    margin-top: 0;
  }
}

/* 会社概要の下のアクセス（地図・外観写真） */
.access {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 840px;
}

.access-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
}

.access-title span {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sub);
}

.access-media {
  display: grid;
  gap: 12px;
}

.access-photo {
  margin: 0;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.access-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.access-map {
  aspect-ratio: 4 / 3;
  background: #eef3f8;
}

.access-map iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  filter: saturate(0.6);
}

.access-note {
  color: var(--sub);
  font-size: 12px;
  line-height: 2;
}

.access-note a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 4px;
}

@media (min-width: 768px) {
  .access {
    gap: 20px;
    max-width: 1040px;
  }
  /* PC・タブレットでは写真と地図を横に並べる */
  .access-media {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .access-note {
    font-size: 13px;
  }
}

/* ---------- contact ---------- */

#contact {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.contact-banner {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 1040px;
  padding: 36px 24px;
  background: var(--brand-deep);
  color: #ffffff;
  transition: background-color 0.2s ease;
}

.contact-banner:hover {
  background: var(--brand);
  color: #ffffff;
}

.contact-banner:focus-visible {
  outline-offset: 6px;
}

.contact-banner-text {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-banner-title {
  font-family: var(--font-serif);
  font-size: clamp(34px, 3.9vw, 56px);
  line-height: 1.05;
}

.contact-banner-sub {
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.04em;
}

.contact-banner .more {
  align-self: flex-end;
}

@media (min-width: 768px) {
  #contact {
    gap: 64px;
  }
  .contact-banner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
    padding: 56px 64px;
  }
  .contact-banner-sub {
    font-size: 13px;
    letter-spacing: 0.08em;
  }
  .contact-banner .more {
    align-self: center;
  }
}

/* ---------- privacy policy ---------- */

.policy {
  display: flex;
  flex-direction: column;
  gap: 56px;
  padding-top: 80px;
}

.policy .section-head {
  max-width: 840px;
}

.policy-body {
  display: flex;
  flex-direction: column;
  gap: 48px;
  max-width: 840px;
  font-size: 13px;
  line-height: 2.1;
}

.policy-body section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.policy-body h2 {
  margin: 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mincho);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.policy-body h3 {
  margin: 8px 0 0;
  font-size: 13px;
  font-weight: 500;
}

.policy-body ul {
  padding-left: 1.4em;
  list-style: disc;
  color: var(--sub);
}

.policy-body p {
  color: var(--sub);
}

.policy-body a {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.policy-body .company {
  margin-top: 8px;
}

/* 見出しの下線と重なるので、先頭行の上罫線は消す */
.policy-body .company > div:first-child {
  border-top: 0;
}

.policy-date {
  text-align: right;
}

@media (min-width: 768px) {
  .policy {
    gap: 80px;
    padding-top: 120px;
  }
  .policy-body {
    gap: 64px;
    font-size: 14px;
  }
  .policy-body h2 {
    font-size: 20px;
  }
  .policy-body h3 {
    font-size: 14px;
  }
}

@media (min-width: 1100px) {
  .policy .section-label {
    top: 128px;
  }
}

/* ---------- 404 ---------- */

.not-found {
  display: flex;
  flex-direction: column;
  gap: 40px;
  padding-top: 80px;
}

.not-found .section-label {
  top: 96px;
}

.not-found-code {
  color: var(--brand);
  font-family: var(--font-serif);
  font-size: clamp(120px, 22vw, 320px);
  line-height: 0.9;
}

.not-found-link {
  align-self: flex-start;
  padding: 12px 0;
}

@media (min-width: 768px) {
  .not-found {
    gap: 56px;
    padding-top: 120px;
  }
  .not-found .section-label {
    top: 140px;
  }
}

/* ---------- footer ---------- */

.site-footer {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding: 64px var(--pad-edge) 32px;
  border-top: 1px solid var(--line);
}

.footer-logo {
  margin: 0;
  line-height: 0;
}

.footer-logo img {
  width: clamp(220px, 32vw, 460px);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
}

.footer-nav a {
  padding: 14px 0;
}

.copyright {
  color: var(--sub);
  font-size: 10px;
  letter-spacing: 0.16em;
}

@media (min-width: 768px) {
  .site-footer {
    gap: 64px;
    padding: 96px var(--pad-edge) 48px;
  }
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
  .footer-nav {
    flex-direction: row;
    gap: 40px;
    font-size: 12px;
  }
  .copyright {
    font-size: 11px;
  }
}

/* ---------- motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
  }
}