/* ========================================
   STAGE WORKS - Brand color system
   ======================================== */

:root {
  /* Brand palette */
  --color-navy: #596372;         
  --color-blue-deep: #434c59;     
  --color-blue-mid: #6f7c8f;     
  --color-blue-primary: #0b57d0; 
  --color-gray: #9bb0c1;        
  --color-gray-mid: #b4c6d4;  
  --color-blue-light: #64b5ff;  
  --color-blue-bright: #e1f0ff;  

  /* Semantic tokens */
  --color-bg: var(--color-navy);
  --color-bg-elevated: var(--color-blue-deep);   
  --color-bg-surface: #4d5663;             
  --color-bg-dark: #2d333d;                       
  --color-text: #ebf3fa;                          
  --color-text-muted: var(--color-gray-mid);      
  --color-text-subtle: var(--color-gray);
  --color-border: var(--color-blue-deep);
  --color-border-light: var(--color-blue-mid);     
  --color-accent: var(--color-blue-light);         
  --color-accent-hover: var(--color-blue-bright);
  --color-highlight: var(--color-blue-bright);

  --font-en: "Cormorant Garamond", "Times New Roman", serif;
  --font-jp: "Noto Sans JP", "Hiragino Sans", sans-serif;
  --header-height: 72px;
  --max-width: 1200px;
  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  font-family: var(--font-jp);
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  letter-spacing: 0.04em;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--color-highlight);
  opacity: 1;
}

/* ----- Typography ----- */
.en-title {
  font-family: var(--font-en);
  font-weight: 300;
  letter-spacing: 0.12em;
  line-height: 1.2;
  text-transform: uppercase;
  color: var(--color-text);
}

.jp-title {
  font-family: var(--font-jp);
  font-weight: 500;
  letter-spacing: 0.15em;
}

/* ----- Header ----- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background: rgba(0, 29, 53, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-blue-deep);
}

.site-header__logo {
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  color: var(--color-highlight);
}

.site-header__social {
  display: flex;
  gap: 20px;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.site-header__social a {
  text-transform: uppercase;
}

.site-header__nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
}

.site-header__nav-toggle span,
.site-header__nav-toggle::before,
.site-header__nav-toggle::after {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--color-text);
  position: absolute;
  left: 0;
  transition: var(--transition);
}

.site-header__nav-toggle span { top: 50%; transform: translateY(-50%); }
.site-header__nav-toggle::before { content: ""; top: 0; }
.site-header__nav-toggle::after { content: ""; bottom: 0; }

/* Fullscreen nav overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

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

.nav-overlay__list {
  list-style: none;
  text-align: center;
}

.nav-overlay__list li {
  margin: 16px 0;
}

.nav-overlay__list a {
  font-family: var(--font-en);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 300;
  color: var(--color-text);
}

.nav-overlay__list a:hover {
  color: var(--color-highlight);
}

.nav-overlay__close {
  position: absolute;
  top: 24px;
  right: 40px;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  letter-spacing: 0.1em;
}

/* ----- Breadcrumb ----- */
.breadcrumb {
  padding: 0 40px 40px;
  max-width: var(--max-width);
  margin: 0 auto;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
}

.breadcrumb a::after {
  content: " / ";
  margin: 0 8px;
  opacity: 0.5;
}

/* ----- Section ----- */
.section {
  padding: 80px 40px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section--full {
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

.section__label {
  font-family: var(--font-en);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-blue-light);
  margin-bottom: 48px;
  text-align: center;
}

/* ----- View More button ----- */
.btn-more {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--color-highlight);
  border-bottom: 1px solid var(--color-blue-light);
  padding-bottom: 4px;
  margin-top: 24px;
}

.btn-more::after {
  content: "→";
  transition: transform var(--transition);
}

.btn-more:hover::after {
  transform: translateX(6px);
}

.btn-more:hover {
  opacity: 1;
}

/* ----- Card grid (Projects / News) ----- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.card {
  background: var(--color-bg-elevated);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-blue-light);
  box-shadow: 0 12px 40px rgba(11, 87, 208, 0.25);
}

.card__image {
  aspect-ratio: 4 / 3;
  background: var(--color-bg-surface) center/cover no-repeat;
  overflow: hidden;
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.card:hover .card__image img {
  transform: scale(1.05);
}

.card__body {
  padding: 24px;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.card__tag {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border: 1px solid var(--color-blue-mid);
  color: var(--color-blue-bright);
  background: rgba(0, 99, 155, 0.2);
}

.card__title {
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 8px;
  color: var(--color-text);
}

.card__meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ----- Split layout (About, Workflow) ----- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.split__image {
  aspect-ratio: 3 / 4;
  background: var(--color-bg-surface) center/cover no-repeat;
  border: 1px solid var(--color-border-light);
}

.split__content h3 {
  font-family: var(--font-en);
  font-size: 1.75rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
  line-height: 1.4;
}

.split__content p {
  font-size: 0.875rem;
  color: var(--color-gray-mid);
  margin-bottom: 16px;
}

.split__content > p:first-of-type {
  color: var(--color-text);
}

/* ----- FAQ accordion ----- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-item__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 28px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-jp);
  font-size: 0.9rem;
  text-align: left;
  letter-spacing: 0.06em;
  color: var(--color-text);
}

.faq-item__question::after {
  content: "+";
  font-family: var(--font-en);
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--color-blue-light);
  transition: transform var(--transition);
}

.faq-item.is-open .faq-item__question::after {
  transform: rotate(45deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition), padding var(--transition);
}

.faq-item.is-open .faq-item__answer {
  max-height: 1200px;
  padding-bottom: 28px;
}

.faq-item__answer p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 2;
}

/* ----- Contact form ----- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.contact-info__block {
  margin-bottom: 40px;
}

.contact-info__block h4 {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.contact-info__block p {
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 32px;
}

.form-group label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  color: var(--color-text-muted);
}

.form-group label .required {
  color: var(--color-blue-bright);
  margin-left: 4px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 0;
  border: none;
  border-bottom: 1px solid var(--color-border-light);
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-jp);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  outline: none;
  transition: border-color var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-subtle);
}

.form-group select option {
  background: var(--color-bg-elevated);
  color: var(--color-text);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-bottom-color: var(--color-blue-light);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.btn-submit {
  display: inline-block;
  padding: 16px 48px;
  background: var(--color-text);
  color: var(--color-bg);
  border: none;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.btn-submit:hover {
  background: var(--color-accent);
  opacity: 1;
}

/* ----- Workflow steps ----- */
.workflow-steps {
  counter-reset: step;
}

.workflow-step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 40px;
  padding: 48px 0;
  border-bottom: 1px solid var(--color-border);
}

.workflow-step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-en);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--color-blue-mid);
  line-height: 1;
}

.workflow-step h3 {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.workflow-step p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ----- Reviews ----- */
.review-card {
  padding: 40px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-light);
  margin-bottom: 24px;
}

.review-card__stars {
  color: var(--color-blue-bright);
  letter-spacing: 4px;
  margin-bottom: 16px;
  font-size: 0.875rem;
}

.review-card__text {
  font-size: 0.9rem;
  line-height: 2;
  margin-bottom: 24px;
  color: var(--color-text-muted);
}

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

/* ----- Article detail ----- */
.article-header {
  max-width: 800px;
  margin: 0 auto 48px;
  text-align: center;
}

.article-header__date {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.article-header__title {
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.08em;
}

.article-body {
  max-width: 720px;
  margin: 0 auto;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 2.2;
}

.article-body p {
  margin-bottom: 24px;
}

.article-body h2 {
  font-size: 1.1rem;
  color: var(--color-text);
  font-weight: 500;
  margin: 48px 0 24px;
  letter-spacing: 0.1em;
}

.article-featured-image {
  width: 100%;
  max-width: 960px;
  margin: 0 auto 64px;
  aspect-ratio: 16 / 9;
  background: #e8e6e1 center/cover no-repeat;
}

/* ----- CTA band ----- */
.cta-band {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 80px;
}

.cta-band__item {
  padding: 80px 40px;
  text-align: center;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-light);
  transition: background var(--transition), border-color var(--transition);
}

.cta-band__item:hover {
  background: var(--color-accent);
  border-color: var(--color-blue-light);
  color: var(--color-text);
  opacity: 1;
}

.cta-band__item:hover h3 {
  color: var(--color-highlight);
}

.cta-band__item h3 {
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  margin-bottom: 8px;
}

.cta-band__item p {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

/* ----- Footer ----- */
.site-footer {
  background: var(--color-bg-dark);
  color: #f7f6f3;
  padding: 80px 40px 40px;
  margin-top: 120px;
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}

.site-footer__logo {
  font-family: var(--font-en);
  font-size: 2rem;
  letter-spacing: 0.3em;
  margin-bottom: 32px;
  color: var(--color-highlight);
}

.site-footer__address {
  font-size: 0.8rem;
  line-height: 2;
  color: var(--color-gray-mid);
  letter-spacing: 0.06em;
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  justify-content: flex-end;
  align-content: flex-start;
}

.site-footer__nav a {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--font-en);
}

.site-footer__social {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  justify-content: flex-end;
}

.site-footer__social a {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-footer__bottom {
  max-width: var(--max-width);
  margin: 64px auto 0;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: rgba(247, 246, 243, 0.5);
  letter-spacing: 0.08em;
}

/* ----- Filter tabs ----- */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.filter-tabs button {
  background: none;
  border: none;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  padding: 8px 0;
  cursor: pointer;
  color: var(--color-text-muted);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.filter-tabs button.is-active,
.filter-tabs button:hover {
  color: var(--color-highlight);
  border-bottom-color: var(--color-blue-light);
}

/* ----- Values / company info ----- */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  text-align: center;
}

.value-item__number {
  font-family: var(--font-en);
  font-size: 3rem;
  font-weight: 300;
  color: var(--color-blue-mid);
  margin-bottom: 16px;
}

.value-item h4 {
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.value-item p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.9;
}

.company-table {
  width: 100%;
  border-collapse: collapse;
}

.company-table th,
.company-table td {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
  text-align: left;
  vertical-align: top;
}

.company-table th {
  width: 28%;
  color: var(--color-text-muted);
  font-weight: 400;
  letter-spacing: 0.08em;
}

/* ----- Page sections & in-page nav ----- */
.page-section {
  scroll-margin-top: calc(var(--header-height) + 24px);
  padding-top: 80px;
  margin-top: 0;
}

.page-section:first-of-type {
  padding-top: 0;
}

.page-local-nav {
  display: flex;
  justify-content: center;
  gap: 8px 32px;
  flex-wrap: wrap;
  margin-bottom: 64px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border-light);
}

.page-local-nav a {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

.page-local-nav a:hover {
  color: var(--color-highlight);
  opacity: 1;
}

.faq-item__question .meta-date {
  font-size: 0.75rem;
  color: var(--color-blue-light);
  margin-right: 16px;
  flex-shrink: 0;
}

.project-detail-body {
  padding-top: 8px;
}

.project-detail-body .company-table {
  margin-bottom: 24px;
}

/* ----- Animations ----- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----- Responsive ----- */
@media (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .split,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .value-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

@media (max-width: 768px) {
  .site-header {
    padding: 0 24px;
  }

  .site-header__social {
    display: none;
  }

  .site-header__nav-toggle {
    display: block;
  }

  .page-hero,
  .section,
  .breadcrumb {
    padding-left: 24px;
    padding-right: 24px;
  }

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

  .cta-band {
    grid-template-columns: 1fr;
  }

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

  .site-footer__nav,
  .site-footer__social {
    justify-content: flex-start;
  }

  .workflow-step {
    grid-template-columns: 48px 1fr;
    gap: 24px;
  }
}