/* ============================================
   小さな渦巻 合同会社 - Corporate Website
   Color Theme: Dark Blue
   Tone: Clean / Trust
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-bg-dark: #0a1628;
  --color-bg-deep: #0e1d34;
  --color-bg-mid: #142440;
  --color-bg-section: #f5f6f8;
  --color-bg-white: #ffffff;
  --color-bg-card: #fafbfc;

  --color-text-primary: #1a2a4a;
  --color-text-secondary: #4a5a7a;
  --color-text-muted: #7a8aaa;
  --color-text-light: #ffffff;
  --color-text-light-muted: rgba(255, 255, 255, 0.6);

  --color-accent: #2a4a8a;
  --color-accent-light: #3a6abf;
  --color-border: #e0e4ea;
  --color-border-light: rgba(255, 255, 255, 0.12);

  /* Typography */
  --font-primary: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Inter', sans-serif;
  --font-brand-mincho: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', 'MS PMincho', serif;

  /* Spacing */
  --section-padding: 120px;
  --container-width: 1200px;
  --container-padding: 40px;

  /* Transitions */
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-text-primary);
  background-color: var(--color-bg-white);
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

ul {
  list-style: none;
}

/* --- Container --- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* --- Section Common --- */
.section-header {
  margin-bottom: 64px;
}

.section-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-label--light {
  color: var(--color-text-light-muted);
}

.section-title {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  margin-bottom: 20px;
}

.section-title--light {
  color: var(--color-text-light);
}

.section-desc {
  font-size: 0.95rem;
  line-height: 2;
  color: var(--color-text-secondary);
}

.section-desc--light {
  color: var(--color-text-light-muted);
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  padding: 16px 40px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-text-light);
  border: 1px solid var(--color-accent);
}

.btn--primary:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-light);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-text-primary);
}

.btn--outline:hover {
  background-color: var(--color-text-primary);
  color: var(--color-text-light);
}

.btn--submit {
  background-color: var(--color-text-light);
  color: var(--color-bg-dark);
  border: 1px solid var(--color-text-light);
  min-width: 240px;
}

.btn--submit:hover {
  background-color: transparent;
  color: var(--color-text-light);
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 0 40px;
  transition: all var(--transition-base);
}

.header--scrolled {
  background-color: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: 1400px;
  margin: 0 auto;
}

.header__logo {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  z-index: 1001;
}

.header__logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  flex-shrink: 0;
}

.header__logo-name {
  font-family: var(--font-brand-mincho);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.1em;
  line-height: 1.3;
  white-space: nowrap;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 36px;
}

.header__nav-link {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--color-text-light);
  letter-spacing: 0.1em;
  position: relative;
  padding: 4px 0;
  opacity: 0.8;
  transition: opacity var(--transition-base);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text-light);
  transition: width var(--transition-base);
}

.header__nav-link:hover {
  opacity: 1;
}

.header__nav-link:hover::after {
  width: 100%;
}

.header__nav-link--cta {
  opacity: 1;
  border: 1px solid rgba(255, 255, 255, 0.4);
  padding: 8px 24px;
}

.header__nav-link--cta::after {
  display: none;
}

.header__nav-link--cta:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.7);
}

/* Hamburger */
.header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
  padding: 0;
}

.header__hamburger-line {
  display: block;
  width: 24px;
  height: 1px;
  background-color: var(--color-text-light);
  transition: all var(--transition-base);
  transform-origin: center;
}

.header__hamburger.active .header__hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__hamburger.active .header__hamburger-line:nth-child(2) {
  opacity: 0;
}

.header__hamburger.active .header__hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero --- */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 22, 40, 0.5) 0%,
    rgba(10, 22, 40, 0.3) 40%,
    rgba(10, 22, 40, 0.6) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--color-text-light);
}

.hero__label {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--color-text-light-muted);
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1s 0.3s forwards;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  line-height: 1.1;
  margin-bottom: 20px;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s 0.6s forwards;
}

.hero__subtitle {
  font-size: 0.9rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--color-text-light-muted);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1s 0.9s forwards;
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translate3d(-50%, 20px, 0);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  animation: fadeInUpCentered 1s 1.2s forwards;
  z-index: 1;
  pointer-events: none;
}

.hero__scroll-text {
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--color-text-light-muted);
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-text-light-muted), transparent);
  animation: scrollLine 2s infinite;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUpCentered {
  to {
    opacity: 1;
    transform: translate3d(-50%, 0, 0);
  }
}

@keyframes scrollLine {
  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; }
}

/* --- Philosophy --- */
.philosophy {
  padding: var(--section-padding) 0;
  background-color: var(--color-bg-white);
}

.philosophy__inner {
  max-width: 800px;
}

.philosophy__heading {
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 2;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  margin-bottom: 32px;
}

.philosophy__text {
  font-size: 0.95rem;
  line-height: 2.2;
  color: var(--color-text-secondary);
  margin-bottom: 48px;
}

/* --- Business --- */
.business {
  padding: var(--section-padding) 0;
  background-color: var(--color-bg-section);
}

.business__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 64px;
}

.business__card {
  background-color: var(--color-bg-white);
  overflow: hidden;
  transition: transform var(--transition-slow);
}

.business__card:hover {
  transform: translateY(-4px);
}

.business__card-img {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.business__card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.business__card:hover .business__card-img img {
  transform: scale(1.05);
}

.business__card-number {
  position: absolute;
  top: 16px;
  left: 16px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.1em;
  background-color: rgba(10, 22, 40, 0.6);
  padding: 4px 12px;
  backdrop-filter: blur(4px);
}

.business__card-body {
  padding: 32px 28px;
}

.business__card-title {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.business__card-text {
  font-size: 0.875rem;
  line-height: 2;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.business__card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  background-color: var(--color-bg-section);
  padding: 4px 12px;
  border: 1px solid var(--color-border);
}

.business__cta {
  text-align: center;
}

.business__cta-text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

/* --- Company --- */
.company {
  padding: var(--section-padding) 0;
  background-color: var(--color-bg-white);
  color: var(--color-text-primary);
}

.company__table-wrap {
  max-width: 900px;
}

.company__table {
  width: 100%;
  border-collapse: collapse;
}

.company__table tr {
  border-bottom: 1px solid var(--color-border);
}

.company__table th,
.company__table td {
  padding: 20px 0;
  font-size: 0.9rem;
  vertical-align: top;
  text-align: left;
}

.company__table th {
  width: 160px;
  font-weight: 500;
  color: var(--color-text-primary);
  letter-spacing: 0.05em;
  padding-right: 40px;
}

.company__table td {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.company__table td a {
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.company__table td a:hover {
  border-bottom-color: var(--color-accent);
}

.company__business-list {
  list-style: none;
}

.company__business-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 4px;
}

.company__business-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background-color: var(--color-text-muted);
}

/* --- Access --- */
.access {
  padding: var(--section-padding) 0;
  background-color: var(--color-bg-section);
  color: var(--color-text-primary);
}

.access__content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
  align-items: start;
}

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

.access__info-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.access__info-text {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.access__info-text a {
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.access__info-text a:hover {
  border-bottom-color: var(--color-accent);
}

.access__map {
  width: 100%;
}

.access__map-placeholder {
  width: 100%;
  aspect-ratio: 16 / 10;
  background-color: #e8eaee;
  overflow: hidden;
}

.access__map-placeholder iframe {
  width: 100%;
  height: 100%;
}

/* --- Contact --- */
.contact {
  padding: var(--section-padding) 0;
  background-color: var(--color-bg-dark);
}

.contact .section-header {
  text-align: center;
}

.contact__cta {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.contact__cta-text {
  font-size: 0.95rem;
  color: var(--color-text-light-muted);
  margin-bottom: 24px;
}

.contact__cta-text a {
  color: var(--color-text-light);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.contact__cta-text a:hover {
  border-bottom-color: rgba(255, 255, 255, 0.6);
}

.contact__form {
  max-width: 700px;
  margin: 0 auto;
}

.contact__form-group {
  margin-bottom: 28px;
}

.contact__form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-text-light-muted);
  margin-bottom: 8px;
}

.required {
  color: #e07070;
  font-size: 0.7rem;
}

.contact__form-input,
.contact__form-select,
.contact__form-textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: var(--font-primary);
  font-size: 0.9rem;
  color: var(--color-text-light);
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-border-light);
  outline: none;
  transition: border-color var(--transition-base), background-color var(--transition-base);
  appearance: none;
  -webkit-appearance: none;
}

.contact__form-input::placeholder,
.contact__form-textarea::placeholder {
  color: rgba(255, 255, 255, 0.25);
}

.contact__form-input:focus,
.contact__form-select:focus,
.contact__form-textarea:focus {
  border-color: rgba(255, 255, 255, 0.4);
  background-color: rgba(255, 255, 255, 0.1);
}

.contact__form-select {
  color: rgba(255, 255, 255, 0.5);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='rgba(255,255,255,0.4)'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.contact__form-select option {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
}

.contact__form-textarea {
  resize: vertical;
  min-height: 160px;
}

.contact__form-submit {
  text-align: center;
  margin-top: 40px;
}

/* --- Footer --- */
.footer {
  background-color: var(--color-bg-deep);
  padding: 64px 0 32px;
  border-top: 1px solid var(--color-border-light);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-border-light);
}

.footer__logo {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.footer__logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex-shrink: 0;
}

.footer__logo-name {
  font-family: var(--font-brand-mincho);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.1em;
  line-height: 1.5;
  white-space: nowrap;
}

.footer__tagline {
  font-size: 0.75rem;
  color: var(--color-text-light-muted);
  letter-spacing: 0.05em;
}

.footer__nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__nav a {
  font-size: 0.8rem;
  color: var(--color-text-light-muted);
  letter-spacing: 0.05em;
  transition: color var(--transition-base);
}

.footer__nav a:hover {
  color: var(--color-text-light);
}

.footer__address {
  font-size: 0.8rem;
  line-height: 1.8;
  color: var(--color-text-light-muted);
  margin-bottom: 12px;
}

.footer__email a {
  font-size: 0.8rem;
  color: var(--color-text-light-muted);
  transition: color var(--transition-base);
}

.footer__email a:hover {
  color: var(--color-text-light);
}

.footer__bottom {
  padding-top: 24px;
}

.footer__copyright {
  font-size: 0.7rem;
  color: var(--color-text-light-muted);
  letter-spacing: 0.05em;
  text-align: center;
}

/* --- Scroll Animations --- */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  :root {
    --section-padding: 80px;
    --container-padding: 32px;
  }

  .business__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

@media (max-width: 768px) {
  :root {
    --section-padding: 64px;
    --container-padding: 20px;
  }

  .header {
    padding: 0 20px;
  }

  .header__inner {
    height: 64px;
  }

  .header__logo {
    gap: 10px;
  }

  .header__logo-img {
    width: 36px;
    height: 36px;
  }

  .header__logo-name {
    font-size: 0.8rem;
    letter-spacing: 0.06em;
  }

  .footer__logo {
    gap: 10px;
  }

  .footer__logo-img {
    width: 34px;
    height: 34px;
  }

  .footer__logo-name {
    font-size: 0.92rem;
    letter-spacing: 0.08em;
  }

  .header__hamburger {
    display: flex;
  }

  .header__nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(10, 22, 40, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-slow);
    z-index: 1000;
  }

  .header__nav.active {
    opacity: 1;
    visibility: visible;
  }

  .header__nav-list {
    flex-direction: column;
    gap: 32px;
    text-align: center;
  }

  .header__nav-link {
    font-size: 1rem;
    letter-spacing: 0.15em;
    opacity: 1;
  }

  .header__nav-link--cta {
    padding: 12px 32px;
  }

  .hero__title {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }

  .hero__subtitle {
    font-size: 0.8rem;
    letter-spacing: 0.1em;
  }

  .philosophy__heading {
    font-size: 1.2rem;
  }

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

  .business__grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .company__table th {
    display: block;
    width: 100%;
    padding-bottom: 4px;
    padding-right: 0;
    font-size: 0.8rem;
    color: var(--color-text-muted);
  }

  .company__table td {
    display: block;
    padding-top: 0;
    padding-bottom: 20px;
  }

  .access__content {
    gap: 32px;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header__logo-name {
    font-size: 0.65rem;
    letter-spacing: 0.03em;
  }

  .footer__logo-img {
    width: 30px;
    height: 30px;
  }

  .footer__logo-name {
    font-size: 0.82rem;
    letter-spacing: 0.05em;
  }

  .hero__label {
    font-size: 0.65rem;
  }

  .hero__title {
    font-size: 2.5rem;
  }

  .hero__subtitle {
    font-size: 0.75rem;
    padding: 0 20px;
  }

  .philosophy__heading br {
    display: none;
  }

  .section-desc br {
    display: none;
  }

  .contact .section-desc--light br {
    display: none;
  }
}