/* ==========================================================================
   Twinbee — Base Setup
   ========================================================================== */
:root {
  /* Brand colors: 真鍮ゴールド × 黒 */
  --color-black: #0d0c0a;
  --color-black-soft: #17150f;
  --color-black-card: #1e1b14;
  --color-gold: #b6912c;
  --color-gold-light: #e0c477;
  --color-gold-dark: #8a6c22;
  --color-white: #f7f4ec;
  --color-gray: #cfc9ba;
  --color-gray-dim: #9a9384;
  --color-border: rgba(182, 145, 44, 0.28);

  --font-serif-jp: 'Shippori Mincho', serif;
  --font-script: 'Cormorant Garamond', serif;
  --font-sans-jp: 'Noto Sans JP', sans-serif;

  --container-width: 1140px;
  --section-padding: 120px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans-jp);
  background-color: var(--color-black);
  color: var(--color-white);
  line-height: 1.9;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-script);
  font-style: italic;
  color: var(--color-gold-light);
  letter-spacing: 0.15em;
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif-jp);
  font-weight: 500;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  letter-spacing: 0.08em;
  margin-bottom: 28px;
  color: var(--color-white);
}

.section-lead {
  color: var(--color-gray);
  margin-bottom: 56px;
  max-width: 640px;
  font-size: 0.98rem;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-block;
  padding: 16px 40px;
  border-radius: 999px;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  font-weight: 500;
  transition: all var(--transition);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold) 60%, var(--color-gold-dark));
  color: var(--color-black);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

.btn-outline {
  border-color: var(--color-gold);
  color: var(--color-gold-light);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(182, 145, 44, 0.12);
  transform: translateY(-2px);
}

.btn-submit {
  width: 100%;
  border: none;
  font-size: 1rem;
}

/* ==========================================================================
   Header / Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(13, 12, 10, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  height: 38px;
  width: auto;
}

.main-nav ul {
  display: flex;
  gap: 40px;
}

.main-nav a {
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--color-gray);
  position: relative;
  transition: color var(--transition);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition);
}

.main-nav a:hover {
  color: var(--color-gold-light);
}

.main-nav a:hover::after {
  width: 100%;
}

/* Hamburger (checkbox hack) */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  z-index: 1100;
}

.nav-toggle-label span {
  width: 26px;
  height: 2px;
  background: var(--color-gold-light);
  transition: all var(--transition);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  /* TODO: 阿蘇の風景写真に差し替え予定 (background-image: url('../assets/img/hero-bg.jpg')) */
  background:
    radial-gradient(circle at 30% 20%, rgba(182, 145, 44, 0.18), transparent 55%),
    radial-gradient(circle at 75% 75%, rgba(182, 145, 44, 0.12), transparent 50%),
    linear-gradient(160deg, #0d0c0a 0%, #17150f 55%, #0d0c0a 100%);
  background-size: cover;
  background-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13, 12, 10, 0.1) 0%, rgba(13, 12, 10, 0.75) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 0 24px;
}

.hero-logo {
  width: min(420px, 80vw);
  margin: 0 auto 36px;
}

.hero-lead {
  font-family: var(--font-serif-jp);
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  letter-spacing: 0.15em;
  color: var(--color-white);
  margin-bottom: 12px;
}

.hero-sub {
  font-family: var(--font-script);
  font-style: italic;
  color: var(--color-gold-light);
  letter-spacing: 0.05em;
  font-size: 1.05rem;
  margin-bottom: 44px;
}

.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.scroll-down {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.scroll-down span {
  display: block;
  width: 1px;
  height: 60px;
  background: linear-gradient(180deg, var(--color-gold), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ==========================================================================
   Concept
   ========================================================================== */
.concept {
  padding: var(--section-padding) 0;
  background: var(--color-black);
  text-align: center;
}

.concept-text {
  max-width: 680px;
  margin: 0 auto 80px;
  color: var(--color-gray);
  font-size: 1rem;
}

.concept-text p {
  margin-bottom: 24px;
}

.concept-highlight {
  font-family: var(--font-serif-jp);
  color: var(--color-gold-light);
  font-size: 1.2rem;
  letter-spacing: 0.1em;
  margin-top: 40px !important;
}

.services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  text-align: left;
}

.service-card {
  position: relative;
  background: var(--color-black-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 40px 28px;
  transition: transform var(--transition), border-color var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-gold);
}

.service-icon {
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.service-card h3 {
  font-family: var(--font-serif-jp);
  font-weight: 500;
  font-size: 1.1rem;
  margin-bottom: 14px;
  color: var(--color-white);
}

.service-card p {
  color: var(--color-gray-dim);
  font-size: 0.9rem;
}

.service-card--future {
  opacity: 0.85;
}

.badge {
  display: inline-block;
  margin-top: 16px;
  padding: 4px 14px;
  border: 1px solid var(--color-gold);
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--color-gold-light);
}

/* ==========================================================================
   Works / 作品例
   ========================================================================== */
.works {
  padding: var(--section-padding) 0;
  background: var(--color-black-soft);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.work-card {
  display: block;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), border-color var(--transition);
}

.work-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-gold);
}

.work-thumb {
  aspect-ratio: 4 / 3;
  background: var(--color-black-card);
  display: flex;
  align-items: center;
  justify-content: center;
}

.work-thumb--placeholder span {
  font-family: var(--font-script);
  font-style: italic;
  font-size: 1.4rem;
  color: var(--color-gold-dark);
  letter-spacing: 0.1em;
}

.work-info {
  padding: 20px 24px;
  background: var(--color-black-card);
  border-top: 1px solid var(--color-border);
}

.work-info h3 {
  font-family: var(--font-serif-jp);
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-white);
}

.work-info p {
  font-size: 0.85rem;
  color: var(--color-gray-dim);
}

/* ==========================================================================
   Forms (共通)
   ========================================================================== */
.order {
  padding: var(--section-padding) 0;
  background: var(--color-black);
}

.form {
  max-width: 720px;
}

.form-row {
  margin-bottom: 28px;
}

.form-row--split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.form label {
  display: block;
  font-size: 0.88rem;
  letter-spacing: 0.05em;
  color: var(--color-gray);
  margin-bottom: 10px;
}

.required {
  display: inline-block;
  margin-left: 8px;
  font-size: 0.7rem;
  color: var(--color-gold-light);
  border: 1px solid var(--color-gold-dark);
  border-radius: 4px;
  padding: 1px 8px;
  vertical-align: middle;
}

.form input[type="text"],
.form input[type="email"],
.form input[type="tel"],
.form select,
.form textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--color-black-card);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-white);
  font-family: var(--font-sans-jp);
  font-size: 0.95rem;
  transition: border-color var(--transition);
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--color-gold);
}

.form textarea {
  resize: vertical;
}

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--color-gray);
  margin: 0;
}

.checkbox-label input {
  accent-color: var(--color-gold);
  width: 16px;
  height: 16px;
}

/* ==========================================================================
   Contact
   ========================================================================== */
.contact {
  padding: var(--section-padding) 0;
  background: var(--color-black-soft);
}

.contact-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 60px;
}

.contact-details {
  margin-top: 40px;
}

.contact-details li {
  display: flex;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.92rem;
}

.contact-label {
  min-width: 90px;
  color: var(--color-gold-light);
  letter-spacing: 0.08em;
  font-size: 0.8rem;
}

.sns-links {
  display: flex;
  gap: 16px;
}

.sns-links a {
  color: var(--color-gray);
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.sns-links a:hover {
  color: var(--color-gold-light);
  border-color: var(--color-gold);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding: 64px 0 40px;
  background: var(--color-black);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-logo {
  height: 60px;
  width: auto;
  margin: 0 auto 20px;
}

.footer-tagline {
  font-family: var(--font-serif-jp);
  color: var(--color-gray);
  letter-spacing: 0.1em;
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.to-top {
  display: inline-block;
  color: var(--color-gold-light);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  margin-bottom: 28px;
  transition: opacity var(--transition);
}

.to-top:hover {
  opacity: 0.7;
}

.copyright {
  color: var(--color-gray-dim);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Responsive — Tablet
   ========================================================================== */
@media (max-width: 900px) {
  :root {
    --section-padding: 88px;
  }

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

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

/* ==========================================================================
   Responsive — Mobile
   ========================================================================== */
@media (max-width: 720px) {
  .nav-toggle-label {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 76px;
    right: 0;
    width: 70%;
    max-width: 300px;
    height: calc(100vh - 76px);
    background: rgba(13, 12, 10, 0.97);
    border-left: 1px solid var(--color-border);
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 40px 32px;
  }

  .main-nav li {
    border-bottom: 1px solid var(--color-border);
  }

  .main-nav a {
    display: block;
    padding: 18px 0;
  }

  .nav-toggle:checked ~ .main-nav {
    transform: translateX(0);
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

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

  .form-row--split {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .concept-text,
  .section-lead {
    font-size: 0.92rem;
  }
}