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

:root {
  --yellow: #F5C800;
  --yellow-dark: #D4A900;
  --yellow-light: #FFF5B0;
  --black: #111111;
  --dark: #1A1A1A;
  --gray-dark: #333333;
  --gray: #666666;
  --gray-light: #AAAAAA;
  --gray-bg: #F5F5F5;
  --white: #FFFFFF;
  --font-jp: 'Noto Sans JP', sans-serif;
  --font-en: 'Bebas Neue', sans-serif;
  --transition: 0.3s ease;
  --shadow: 0 4px 24px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.15);
}

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

body {
  font-family: var(--font-jp);
  color: var(--black);
  background: var(--white);
  line-height: 1.8;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

/* ===========================
   Utility
=========================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--dark);
  color: var(--white);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.25em;
  color: var(--yellow);
  display: block;
  margin-bottom: 12px;
}

.section-dark .section-label {
  color: var(--yellow);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 900;
  letter-spacing: 0.03em;
  line-height: 1.3;
  margin-bottom: 20px;
}

.section-desc {
  font-size: 1rem;
  color: var(--gray);
  line-height: 1.9;
}

.section-dark .section-desc {
  color: var(--gray-light);
}

.accent {
  color: var(--yellow);
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--yellow);
  color: var(--black);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  padding: 14px 36px;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
}

.btn-primary:hover {
  background: var(--yellow-dark);
  transform: translateY(-2px);
}

/* ===========================
   Header / Nav
=========================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: rgba(17, 17, 17, 0.96);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 16px rgba(0,0,0,0.2);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  padding: 0 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-logo {
  font-family: var(--font-jp);
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--white);
  letter-spacing: 0.08em;
  transition: color var(--transition);
}

.nav-logo:hover {
  color: var(--yellow);
}

.nav-logo-img {
  height: 36px;
  width: auto;
  display: block;
  /* 黒ロゴをwhiteに反転 */
  filter: invert(1);
  transition: filter var(--transition);
}

.nav-logo:hover .nav-logo-img {
  /* ホバー時はイエロー (#F5C800) に変換 */
  filter: invert(83%) sepia(60%) saturate(700%) hue-rotate(5deg) brightness(1.05);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--yellow);
}

.nav-cta {
  background: var(--yellow);
  color: var(--black) !important;
  padding: 8px 22px;
  font-weight: 700 !important;
  clip-path: polygon(6px 0%, 100% 0%, calc(100% - 6px) 100%, 0% 100%);
  transition: background var(--transition) !important;
}

.nav-cta:hover {
  background: var(--yellow-dark);
  color: var(--black) !important;
}

.nav-social {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-social-link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,0.7);
  transition: color var(--transition);
}

.nav-social-link:hover {
  color: var(--yellow);
}

.nav-mobile-social {
  display: flex;
  gap: 24px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.nav-mobile-social .nav-social-link {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: rgba(255,255,255,0.7);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
}

/* Mobile Nav */
.nav-mobile {
  display: none;
  background: rgba(17,17,17,0.98);
  padding: 24px 40px 32px;
}

.nav-mobile.open {
  display: block;
}

.nav-mobile ul {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.nav-mobile a {
  color: var(--white);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

.nav-mobile a:hover {
  color: var(--yellow);
}

/* ===========================
   Hero
=========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--dark);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(245,200,0,0.12) 0%, transparent 60%),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 40px,
      rgba(245,200,0,0.03) 40px,
      rgba(245,200,0,0.03) 41px
    );
}

.hero-bg::after {
  content: 'BANSO';
  position: absolute;
  right: -40px;
  bottom: -60px;
  font-family: var(--font-en);
  font-size: clamp(160px, 22vw, 300px);
  color: rgba(245,200,0,0.06);
  line-height: 1;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.02em;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 120px 40px 80px;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.hero-logo-graphic {
  margin-left: -40px;
  margin-right: -40px;
  margin-bottom: 48px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.1s forwards;
}

.hero-logo-graphic img {
  width: 100%;
  height: auto;
  display: block;
}

@media (max-width: 640px) {
  .hero-logo-graphic {
    margin-left: -20px;
    margin-right: -20px;
  }
}

.hero-label {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--yellow);
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.2s forwards;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 900;
  color: var(--white);
  line-height: 1.25;
  margin-bottom: 28px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.4s forwards;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,0.55);
  font-weight: 500;
  letter-spacing: 0.06em;
  margin-bottom: 36px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.6s forwards;
}

.hero-statement {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 44px;
  padding: 28px 24px;
  border-left: 3px solid var(--yellow);
  background: rgba(255,255,255,0.04);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.75s forwards;
}

.hero-statement p {
  font-size: clamp(0.88rem, 1.4vw, 0.97rem);
  color: rgba(255,255,255,0.7);
  line-height: 2;
}

.hero-statement-sig {
  font-size: 0.85rem !important;
  color: rgba(255,255,255,0.45) !important;
  letter-spacing: 0.08em;
  padding-top: 8px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.hero-content .btn-primary {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.8s forwards;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.4);
  font-size: 11px;
  letter-spacing: 0.2em;
  font-family: var(--font-en);
}

.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(245,200,0,0.6), transparent);
  animation: scrollLine 1.6s ease-in-out infinite;
}

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

@keyframes scrollLine {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.1); }
}

/* ===========================
   Philosophy
=========================== */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

.philosophy-card {
  position: relative;
  padding: 48px 36px 52px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: background var(--transition);
}

.philosophy-card:hover {
  background: rgba(255,255,255,0.06);
}

.philosophy-num {
  font-family: var(--font-en);
  font-size: 0.78rem;
  letter-spacing: 0.25em;
  color: rgba(255,255,255,0.2);
  margin-bottom: 28px;
}

.philosophy-en {
  font-family: var(--font-en);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: 0.08em;
  color: var(--yellow);
  line-height: 1;
  margin-bottom: 10px;
}

.philosophy-jp {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.philosophy-body {
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
  color: rgba(255,255,255,0.85);
  line-height: 2;
  font-weight: 500;
  flex: 1;
}

@media (max-width: 900px) {
  .philosophy-grid {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .philosophy-card {
    padding: 36px 28px 40px;
  }
}

/* ===========================
   About
=========================== */
.about-body-simple {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.about-lead {
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  font-weight: 900;
  line-height: 1.7;
  border-left: 4px solid var(--yellow);
  padding-left: 20px;
  color: var(--black);
}

.about-body {
  font-size: clamp(0.97rem, 1.5vw, 1.05rem);
  color: var(--gray-dark);
  line-height: 2.1;
}

.about-closing {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  font-weight: 900;
  color: var(--black);
  letter-spacing: 0.04em;
  padding-top: 8px;
  border-top: 1px solid #E0E0E0;
}

/* ===========================
   Service
=========================== */
.service-list {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.service-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.service-item-rev {
  direction: rtl;
}

.service-item-rev > * {
  direction: ltr;
}

.service-item-img {
  position: sticky;
  top: 100px;
}

.service-img-placeholder {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 4rem;
  color: rgba(255,255,255,0.12);
  letter-spacing: 0.1em;
}

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

.service-item-body {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.service-num {
  font-family: var(--font-en);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: rgba(255,255,255,0.25);
}

.service-title {
  font-size: clamp(1.4rem, 2.5vw, 1.8rem);
  font-weight: 900;
  color: var(--white);
  letter-spacing: 0.03em;
  line-height: 1.3;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.service-desc {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.service-desc p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.7);
  line-height: 2;
}

.service-cases {
  background: rgba(255,255,255,0.04);
  border-left: 3px solid var(--yellow);
  padding: 20px 24px;
}

.service-cases-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--yellow);
  margin-bottom: 14px;
}

.service-cases ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-cases li {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  padding-left: 14px;
  position: relative;
  line-height: 1.7;
}

.service-cases li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 1px;
  background: rgba(255,255,255,0.3);
}

@media (max-width: 900px) {
  .service-item,
  .service-item-rev {
    grid-template-columns: 1fr;
    gap: 32px;
    direction: ltr;
  }

  .service-item-img {
    position: static;
  }

  .service-list {
    gap: 60px;
  }
}

/* ===========================
   Members
=========================== */
.members-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.member-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--white);
  border: 1px solid #E8E8E8;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.member-info {
  padding: 28px 32px 32px;
}

.member-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.member-photo {
  width: 100%;
  aspect-ratio: 4 / 3;
  max-height: 300px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--gray-bg);
}

.member-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.5s ease;
}

.member-card:hover .member-photo img {
  transform: scale(1.04);
}

.member-photo-placeholder {
  width: 100%;
  aspect-ratio: 3 / 4;
  background: var(--dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--yellow);
  flex-shrink: 0;
}

.member-title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--white);
  background: var(--black);
  display: inline-block;
  padding: 3px 12px;
  margin-bottom: 8px;
}

.member-name {
  font-size: 1.3rem;
  font-weight: 900;
  margin-bottom: 16px;
}

.member-name span {
  font-family: var(--font-en);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--gray);
  margin-left: 10px;
  letter-spacing: 0.1em;
}

.member-career {
  font-size: 0.9rem;
  color: var(--gray-dark);
  line-height: 1.9;
  margin-bottom: 20px;
}

.member-history {
  border-top: 1px solid #E8E8E8;
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.member-history li {
  font-size: 0.84rem;
  color: var(--gray);
  padding-left: 16px;
  position: relative;
}

.member-history li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--gray-dark);
}

/* ===========================
   Contact
=========================== */
.contact {
  background: var(--gray-bg);
}

.contact-form {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--dark);
  letter-spacing: 0.03em;
}

.required {
  color: #E53E3E;
  margin-left: 4px;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 14px 16px;
  border: 1px solid #DDDDDD;
  background: var(--white);
  font-family: var(--font-jp);
  font-size: 0.95rem;
  color: var(--black);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px rgba(245,200,0,0.15);
}

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

.btn-submit {
  align-self: center;
  padding: 16px 56px;
  font-size: 1rem;
}

.form-success {
  display: none;
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  padding: 60px 40px;
  background: var(--white);
  border: 1px solid #E8E8E8;
}

.form-success.visible {
  display: block;
}

.form-success-icon {
  font-size: 2.4rem;
  color: var(--yellow);
  margin-bottom: 16px;
  font-weight: 900;
}

.form-success-title {
  font-size: 1.3rem;
  font-weight: 900;
  margin-bottom: 16px;
  color: var(--black);
}

.form-success-body {
  font-size: 0.95rem;
  color: var(--gray);
  line-height: 2;
}

/* ===========================
   Footer
=========================== */
.footer {
  background: var(--dark);
  color: var(--white);
  padding: 48px 0 28px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
  font-weight: 900;
  font-size: 1.2rem;
  letter-spacing: 0.1em;
  color: var(--yellow);
}

.footer-logo-img {
  height: 40px;
  width: auto;
  filter: invert(1);
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--gray-light);
}

.footer-nav {
  display: flex;
  gap: 28px;
}

.footer-nav a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--yellow);
}

.footer-copyright {
  text-align: center;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.3);
}

/* ===========================
   Scroll Reveal Animation
=========================== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===========================
   Responsive
=========================== */
@media (max-width: 900px) {
  .members-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 72px 0;
  }

  .nav {
    padding: 0 20px;
  }

  .nav-links {
    display: none;
  }

  .nav-social {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .hero-content {
    padding: 100px 20px 60px;
  }

  .hero-scroll {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: 16px;
  }
}