/* ==============================================
   BlueOcean Inc. — Corporate Website
   Style Sheet
   ============================================== */

/* ---------- CSS Variables ---------- */
:root {
  --color-black: #0a0a0a;
  --color-dark: #1a1a1a;
  --color-mid: #555555;
  --color-light: #999999;
  --color-border: #e0e0e0;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f7f5;
  --color-accent: #1a1a1a;

  --font-serif: 'Cormorant Garamond', 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', sans-serif;

  --max-width: 1320px;
  --section-padding: 140px;
  --section-padding-sp: 80px;

  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-slow: 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-dark);
  background-color: var(--color-bg);
  line-height: 1.9;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

.sp-only{
display:none;
}

/* ---------- Utility ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 7%;
}

/* ---------- Reveal Animations ---------- */
.reveal-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s var(--transition-slow), transform 0.9s var(--transition-slow);
}

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

.reveal-fade {
  opacity: 0;
  transition: opacity 1s ease;
}

.reveal-fade.is-visible {
  opacity: 1;
}

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* ---------- Section Common ---------- */
.section {
  padding: var(--section-padding) 0;
}

.section__head {
  text-align: center;
  margin-bottom: 80px;
}

.section__title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  letter-spacing: 0.25em;
  color: var(--color-black);
  line-height: 1;
}

.section__subtitle {
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--color-light);
  margin-top: 16px;
  font-weight: 300;
}

/* ==============================================
   HEADER
   ============================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: background-color 0.5s ease, backdrop-filter 0.5s ease,
              box-shadow 0.5s ease;
}

.header--scrolled {
  background-color: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 7%;
  height: 72px;
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.logo-text {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.35rem;
  letter-spacing: 0.1em;
  color: var(--color-bg);
  transition: color var(--transition);
}

.header--scrolled .logo-text {
  color: var(--color-black);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav__link {
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.9);
  transition: color var(--transition), opacity var(--transition);
  text-transform: uppercase;
}

.nav__link:hover {
  color: #fff;
  opacity: 0.7;
}

.header--scrolled .nav__link {
  color: var(--color-mid);
}

.header--scrolled .nav__link:hover {
  color: var(--color-black);
  opacity: 1;
}

.nav__link--contact {
  border: 1px solid rgba(255, 255, 255, 0.6);
  padding: 8px 20px;
  border-radius: 2px;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.nav__link--contact:hover {
  background-color: rgba(255, 255, 255, 0.15);
  opacity: 1;
}

.header--scrolled .nav__link--contact {
  border-color: var(--color-border);
}

.header--scrolled .nav__link--contact:hover {
  background-color: var(--color-black);
  color: #fff;
  border-color: var(--color-black);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.9);
  transition: all var(--transition);
}

.header--scrolled .hamburger span {
  background-color: var(--color-dark);
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.hamburger.is-open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile Nav */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--color-black);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__list {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.mobile-nav__link {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.85);
  text-transform: uppercase;
  transition: color var(--transition);
}

.mobile-nav__link:hover {
  color: #fff;
}

/* ==============================================
   SECTION 1: HERO
   ============================================== */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 640px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  filter: grayscale(30%) brightness(0.72);
  transform: scale(1.05);
  transition: transform 8s ease;
}

.hero.is-loaded .hero__bg-img {
  transform: scale(1);
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(5, 5, 5, 0.72) 0%,
    rgba(5, 5, 5, 0.3) 50%,
    rgba(5, 5, 5, 0.15) 100%
  );
}

.hero__content {
position: absolute;
z-index: 1;
top:50%;
left:50%;
transform: translate(-50%, -50%);
}

.hero__text-block {
  max-width: 680px;
}

.hero__eyebrow {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  letter-spacing: 0.4em;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 20px;
  text-transform: uppercase;
  font-weight: 300;
}

.hero__catchcopy {
  font-family: var(--font-serif);
  font-size: clamp(2.6rem, 5.5vw, 4.8rem);
  font-weight: 300;
  color: #ffffff;
  line-height: 1.45;
  letter-spacing: 0.05em;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.25);
  margin-bottom: 28px;
}

.hero__subcopy {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 300;
  letter-spacing: 0.4em;
  color: rgba(255, 255, 255, 0.6);
  line-height: 2;
}

/* Scroll Indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.scroll-text {
  font-size: 0.6rem;
  letter-spacing: 0.35em;
  color: rgba(255, 255, 255, 0.5);
  font-weight: 300;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.5), rgba(255,255,255,0));
  animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ==============================================
   SECTION 2: MESSAGE
   ============================================== */
.message {
  background-color: var(--color-bg);
}

.message__body {
  max-width: 760px;
  margin: 0 auto;
}

.message__text {
  font-size: 0.925rem;
  line-height: 2.05;
  color: var(--color-mid);
  margin-bottom: 1.8em;
  font-weight: 300;
}

.message__text:last-of-type {
  margin-bottom: 0;
}

.message__signature {
  text-align: right;
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-dark);
  margin-top: 48px;
  font-family: var(--font-sans);
}

/* ==============================================
   SECTION 3: SERVICE
   ============================================== */
.service {
  background-color: var(--color-bg-alt);
  padding-bottom: calc(var(--section-padding) - 40px);
}

.service__block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10%;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 7%;
  margin-bottom: 110px;
}

.service__block:last-child {
  margin-bottom: 0;
}

.service__block--img-right {
  grid-template-areas: "text img";
}

.service__block--img-right .service__text-wrap {
  grid-area: text;
}

.service__block--img-right .service__img-wrap {
  grid-area: img;
}

.service__img-wrap {
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.service__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(15%);
  transition: transform 0.8s var(--transition-slow), filter 0.6s ease;
}

.service__img-wrap:hover .service__img {
  transform: scale(1.04);
  filter: grayscale(0%);
}

.service__num {
  display: block;
  font-family: var(--font-serif);
  font-size: 4.5rem;
  font-weight: 300;
  color: rgba(10, 10, 10, 0.06);
  line-height: 1;
  margin-bottom: 12px;
  letter-spacing: 0;
}

.service__name {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-black);
  margin-bottom: 20px;
  line-height: 1.5;
}

.service__desc {
  font-size: 0.875rem;
  line-height: 2.0;
  color: var(--color-mid);
  font-weight: 300;
}

/* ==============================================
   SECTION 4: COMPANY
   ============================================== */
.company {
  background-color: var(--color-bg);
}

.company__table-wrap {
  max-width: 800px;
  margin: 0 auto;
}

.company__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.company__table th,
.company__table td {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.9;
}

.company__table tr:first-child th,
.company__table tr:first-child td {
  border-top: 1px solid var(--color-border);
}

.company__table th {
  width: 30%;
  font-weight: 400;
  color: var(--color-light);
  letter-spacing: 0.05em;
  font-size: 0.8rem;
  padding-right: 5%;
  white-space: nowrap;
}

.company__table td {
  width: 70%;
  color: var(--color-dark);
  font-weight: 300;
}

.table__link {
  color: var(--color-dark);
  transition: color var(--transition);
  font-weight: 300;
}

.table__link:hover {
  color: var(--color-mid);
}

.table__list {
  padding-left: 0;
}

.table__list li {
  position: relative;
  padding-left: 1.2em;
  margin-bottom: 0.4em;
  font-size: 0.875rem;
  color: var(--color-dark);
  font-weight: 300;
}

.table__list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-light);
  font-size: 0.75rem;
}

.table__list li:last-child {
  margin-bottom: 0;
}

/* ==============================================
   SECTION 5: CONTACT
   ============================================== */
.contact {
  background-color: var(--color-bg-alt);
}

.contact__body {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact__lead {
  font-size: 0.9rem;
  line-height: 2.0;
  color: var(--color-mid);
  font-weight: 300;
  margin-bottom: 56px;
}

.contact__info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.contact__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 28px 0;
  width: 100%;
}

.contact__divider {
  width: 1px;
  height: 1px;
  background-color: var(--color-border);
  width: 60%;
  height: 1px;
}

.contact__label {
  font-size: 0.65rem;
  letter-spacing: 0.35em;
  color: var(--color-light);
  font-weight: 300;
  text-transform: uppercase;
}

.contact__value {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--color-dark);
  transition: color var(--transition);
}

.contact__value:hover {
  color: var(--color-mid);
}

/* ==============================================
   FOOTER
   ============================================== */
.footer {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: 56px 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.logo-text--footer {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 1.2rem;
  letter-spacing: 0.15em;
  color: var(--color-dark);
}

.footer__copy {
  font-size: 0.68rem;
  color: var(--color-light);
  letter-spacing: 0.1em;
  font-weight: 300;
}

/* ==============================================
   RESPONSIVE — TABLET
   ============================================== */
@media (max-width: 1024px) {
  :root {
    --section-padding: 110px;
  }

  .service__block {
    gap: 8%;
  }

  .service__num {
    font-size: 3.8rem;
  }
}

/* ==============================================
   RESPONSIVE — SP (768px以下)
   ============================================== */
@media (max-width: 768px) {
.sp-only{
display:block;
}
.pc-only{
display:none;
}
  :root {
    --section-padding: var(--section-padding-sp);
  }

  .container {
    padding: 0 6%;
  }

  /* Header */
  .header__nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* Hero */
  .hero__content {
    padding: 0 6% 88px;
  }

  .hero__catchcopy {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .hero__subcopy {
    display: none;
  }

  /* Section Head */
  .section__head {
    margin-bottom: 56px;
  }

  .section__title {
    font-size: clamp(2.2rem, 8vw, 3.2rem);
  }

  /* Message */
  .message__body {
    max-width: 100%;
  }

  .message__text {
    font-size: 0.875rem;
  }

  /* Service */
  .service__block {
    grid-template-columns: 1fr;
    grid-template-areas: none !important;
    gap: 40px;
    margin-bottom: 72px;
  }

  .service__block--img-right {
    grid-template-areas: none;
  }

  .service__block--img-right .service__text-wrap {
    grid-area: unset;
    order: 2;
  }

  .service__block--img-right .service__img-wrap {
    grid-area: unset;
    order: 1;
  }

  /* Company */
  .company__table {
    font-size: 0.825rem;
  }

  .company__table th {
    width: 35%;
    padding-right: 4%;
    white-space: normal;
  }

  .company__table th,
  .company__table td {
    padding: 18px 0;
  }

  /* Contact */
  .contact__value {
    font-size: 1.05rem;
  }

  /* Footer */
  .footer {
    padding: 40px 0;
  }
}

@media (max-width: 480px) {
  .hero__catchcopy {
    font-size: clamp(1.9rem, 7.5vw, 2.6rem);
  }

  .company__table th {
    width: 38%;
    font-size: 0.75rem;
  }

  .company__table td {
    font-size: 0.8rem;
  }

  .contact__value {
    font-size: 0.95rem;
    letter-spacing: 0.04em;
  }
}