/* ========================================
   ichiwa — 外構・エクステリア
   Design: Craft × Space / Dark & Refined
   ======================================== */

:root {
  --dark:    #141414;
  --charcoal:#252525;
  --iron:    #3a3a3a;
  --stone:   #7a7570;
  --cream:   #f4efe6;
  --sand:    #e8e0d0;
  --white:   #ffffff;
  --brass:   #b89a6a;
  --brass-light: #d4b98a;

  --font-jp: 'Noto Sans JP', 'Yu Gothic', '游ゴシック', sans-serif;
  --font-en: 'Cormorant Garamond', 'Playfair Display', Georgia, serif;

  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --max-w: 1160px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-jp);
  background: var(--cream);
  color: var(--dark);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── Utilities ── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 40px; }
.section-label {
  display: block;
  font-family: var(--font-en);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 300;
  letter-spacing: 0.05em;
  line-height: 1.4;
}
.section-title strong { font-weight: 700; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  border: 1px solid currentColor;
  transition: var(--transition);
  cursor: pointer;
  background: transparent;
  font-family: var(--font-jp);
}
.btn::after { content: '→'; transition: transform var(--transition); }
.btn:hover::after { transform: translateX(6px); }

.btn-dark {
  color: var(--dark);
  border-color: var(--dark);
}
.btn-dark:hover { background: var(--dark); color: var(--cream); }

.btn-light {
  color: var(--cream);
  border-color: var(--cream);
}
.btn-light:hover { background: var(--cream); color: var(--dark); }

.btn-brass {
  color: var(--brass);
  border-color: var(--brass);
}
.btn-brass:hover { background: var(--brass); color: var(--white); }

/* ── Header ── */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 24px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition), padding var(--transition);
}
#header.scrolled {
  background: rgba(20, 20, 20, 0.95);
  backdrop-filter: blur(8px);
  padding: 16px 40px;
}
.logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.logo-en {
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-style: italic;
  color: var(--white);
  letter-spacing: 0.08em;
}
.logo-ja {
  font-size: 0.6rem;
  color: var(--brass);
  letter-spacing: 0.2em;
  margin-top: 3px;
}
nav { display: flex; gap: 36px; }
nav a {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.75);
  transition: color var(--transition);
}
nav a:hover { color: var(--white); }
.header-cta {
  padding: 10px 24px;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  background: var(--brass);
  color: var(--white);
  transition: background var(--transition);
}
.header-cta:hover { background: var(--brass-light); }

/* ── Hero ── */
#hero {
  position: relative;
  height: 100svh;
  min-height: 600px;
  display: flex;
  align-items: flex-end;
  padding-bottom: 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      160deg,
      rgba(0,0,0,0.6) 0%,
      rgba(0,0,0,0.2) 50%,
      rgba(0,0,0,0.5) 100%
    ),
    /* 外構イメージ - アプローチ・石畳のグラデーション */
    linear-gradient(135deg, #2a2520 0%, #3d3530 25%, #4a4540 50%, #383028 75%, #1e1a16 100%);
}
/* 石畳・コンクリートテクスチャ演出 */
.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 59px,
      rgba(255,255,255,0.03) 60px
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 59px,
      rgba(255,255,255,0.03) 60px
    );
}
.hero-bg::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 200px;
  background: linear-gradient(transparent, rgba(20,20,20,0.4));
}
.hero-content {
  position: relative;
  z-index: 1;
  color: var(--white);
}
.hero-sub {
  font-family: var(--font-en);
  font-size: 0.8rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.hero-sub::before {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: var(--brass);
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 5rem);
  font-weight: 200;
  letter-spacing: 0.08em;
  line-height: 1.2;
  margin-bottom: 24px;
}
.hero-title strong {
  font-weight: 700;
  display: block;
}
.hero-desc {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.75);
  max-width: 420px;
  margin-bottom: 40px;
  line-height: 2;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-scroll {
  position: absolute;
  bottom: 40px;
  right: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.5);
  font-family: var(--font-en);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}
.hero-scroll::after {
  content: '';
  display: block;
  width: 1px;
  height: 60px;
  background: linear-gradient(var(--brass), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 1; }
  50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  51%  { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}

/* ── Numbers ── */
#numbers {
  background: var(--dark);
  padding: 60px 0;
}
.numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--iron);
}
.number-item {
  background: var(--charcoal);
  padding: 40px 32px;
  text-align: center;
}
.number-value {
  font-family: var(--font-en);
  font-size: clamp(2.4rem, 4vw, 3.6rem);
  font-weight: 300;
  color: var(--brass);
  line-height: 1;
  margin-bottom: 8px;
}
.number-unit {
  font-size: 1rem;
  color: var(--white);
}
.number-label {
  font-size: 0.78rem;
  color: var(--stone);
  letter-spacing: 0.08em;
  margin-top: 8px;
}

/* ── Works / Gallery ── */
#works {
  padding: 120px 0;
  background: var(--cream);
}
.works-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 60px;
}
.works-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto;
  gap: 12px;
}
.work-item {
  position: relative;
  overflow: hidden;
  background: var(--iron);
  cursor: pointer;
}
.work-item::before {
  content: '';
  display: block;
  padding-top: 70%;
}
.work-img {
  position: absolute;
  inset: 0;
  transition: transform 0.6s var(--transition);
}
.work-item:hover .work-img { transform: scale(1.05); }
.work-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent 40%, rgba(0,0,0,0.8));
  opacity: 0;
  transition: opacity var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 24px;
  color: var(--white);
}
.work-item:hover .work-overlay { opacity: 1; }
.work-tag {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--brass);
  margin-bottom: 4px;
}
.work-name { font-size: 0.9rem; font-weight: 500; }

/* グリッドレイアウト */
.work-item:nth-child(1) { grid-column: 1 / 8; grid-row: 1; }
.work-item:nth-child(2) { grid-column: 8 / 13; grid-row: 1; }
.work-item:nth-child(3) { grid-column: 1 / 5; grid-row: 2; }
.work-item:nth-child(4) { grid-column: 5 / 9; grid-row: 2; }
.work-item:nth-child(5) { grid-column: 9 / 13; grid-row: 2; }
.work-item:nth-child(6) { grid-column: 1 / 6; grid-row: 3; }
.work-item:nth-child(7) { grid-column: 6 / 13; grid-row: 3; }

/* 施工写真の代替カラー（実際の写真が入る場所） */
.work-item:nth-child(1) .work-img { background: linear-gradient(135deg, #3a3530 0%, #4d4540 100%); }
.work-item:nth-child(2) .work-img { background: linear-gradient(135deg, #2a3530 0%, #3a4a40 100%); }
.work-item:nth-child(3) .work-img { background: linear-gradient(135deg, #353040 0%, #454560 100%); }
.work-item:nth-child(4) .work-img { background: linear-gradient(135deg, #402820 0%, #604038 100%); }
.work-item:nth-child(5) .work-img { background: linear-gradient(135deg, #2a3040 0%, #3a4050 100%); }
.work-item:nth-child(6) .work-img { background: linear-gradient(135deg, #303530 0%, #404840 100%); }
.work-item:nth-child(7) .work-img { background: linear-gradient(135deg, #352520 0%, #504030 100%); }

/* ── Philosophy ── */
#philosophy {
  background: var(--dark);
  padding: 140px 0;
  position: relative;
  overflow: hidden;
}
#philosophy::before {
  content: 'craft';
  position: absolute;
  font-family: var(--font-en);
  font-size: 20vw;
  font-weight: 700;
  color: rgba(255,255,255,0.02);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  letter-spacing: -0.05em;
  white-space: nowrap;
  pointer-events: none;
}
.philosophy-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.philosophy-text { color: var(--white); }
.philosophy-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 200;
  line-height: 1.5;
  margin-bottom: 32px;
  letter-spacing: 0.04em;
}
.philosophy-title em {
  font-style: normal;
  color: var(--brass);
}
.philosophy-body {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  line-height: 2.2;
}
.philosophy-visual {
  position: relative;
}
.philosophy-img-wrap {
  position: relative;
  overflow: hidden;
}
.philosophy-img-wrap::before {
  content: '';
  display: block;
  padding-top: 130%;
}
.philosophy-img {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, #3a3025 0%, #4a4035 40%, #252020 100%);
}
.philosophy-badge {
  position: absolute;
  bottom: -20px;
  left: -20px;
  background: var(--brass);
  color: var(--white);
  padding: 24px;
  min-width: 140px;
}
.badge-num {
  font-family: var(--font-en);
  font-size: 2.4rem;
  font-weight: 300;
  line-height: 1;
}
.badge-text {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  margin-top: 4px;
}

/* ── Services ── */
#services {
  padding: 120px 0;
  background: var(--sand);
}
.services-header {
  text-align: center;
  margin-bottom: 72px;
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: rgba(0,0,0,0.08);
}
.service-item {
  background: var(--cream);
  padding: 40px 32px;
  transition: background var(--transition), color var(--transition);
  cursor: default;
}
.service-item:hover {
  background: var(--dark);
  color: var(--white);
}
.service-num {
  font-family: var(--font-en);
  font-size: 0.7rem;
  color: var(--brass);
  letter-spacing: 0.2em;
  margin-bottom: 20px;
}
.service-icon {
  font-size: 1.6rem;
  margin-bottom: 16px;
  line-height: 1;
}
.service-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}
.service-desc {
  font-size: 0.8rem;
  color: var(--stone);
  line-height: 1.9;
  transition: color var(--transition);
}
.service-item:hover .service-desc { color: rgba(255,255,255,0.6); }

/* ── Reasons ── */
#reasons {
  padding: 120px 0;
  background: var(--dark);
  color: var(--white);
}
.reasons-header {
  margin-bottom: 80px;
}
.reasons-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 60px 80px;
}
.reason-item {
  display: flex;
  gap: 24px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--iron);
}
.reason-num {
  font-family: var(--font-en);
  font-size: 3rem;
  font-weight: 300;
  color: var(--iron);
  line-height: 1;
  flex-shrink: 0;
  width: 60px;
}
.reason-body {}
.reason-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  color: var(--cream);
}
.reason-title span {
  display: block;
  font-family: var(--font-en);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--brass);
  margin-bottom: 4px;
  text-transform: uppercase;
}
.reason-text {
  font-size: 0.83rem;
  color: rgba(255,255,255,0.55);
  line-height: 2;
}

/* ── Flow ── */
#flow {
  padding: 120px 0;
  background: var(--cream);
}
.flow-header {
  text-align: center;
  margin-bottom: 80px;
}
.flow-steps {
  display: flex;
  gap: 0;
  position: relative;
}
.flow-steps::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 32px;
  right: 32px;
  height: 1px;
  background: linear-gradient(90deg, var(--brass), var(--sand));
}
.flow-step {
  flex: 1;
  text-align: center;
  padding: 0 16px;
  position: relative;
}
.step-num {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--dark);
  color: var(--cream);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-family: var(--font-en);
  font-size: 1rem;
  letter-spacing: 0.1em;
  position: relative;
  z-index: 1;
  border: 2px solid var(--brass);
}
.step-title {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.step-desc {
  font-size: 0.75rem;
  color: var(--stone);
  line-height: 1.9;
}

/* ── Voice ── */
#voice {
  padding: 120px 0;
  background: var(--charcoal);
  color: var(--white);
}
.voice-header {
  margin-bottom: 60px;
}
.voice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.voice-card {
  background: var(--iron);
  padding: 36px 32px;
  border-left: 3px solid var(--brass);
}
.voice-stars {
  color: var(--brass);
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  margin-bottom: 16px;
}
.voice-text {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.75);
  line-height: 2;
  margin-bottom: 20px;
}
.voice-author {
  font-size: 0.75rem;
  color: var(--stone);
  letter-spacing: 0.08em;
}

/* ── Area ── */
#area {
  padding: 80px 0;
  background: var(--sand);
  text-align: center;
}
.area-title { margin-bottom: 24px; }
.area-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  justify-content: center;
  max-width: 700px;
  margin: 0 auto 40px;
}
.area-tag {
  font-size: 0.8rem;
  padding: 6px 16px;
  background: var(--white);
  color: var(--iron);
  border-radius: 2px;
  letter-spacing: 0.05em;
}

/* ── CTA ── */
#cta {
  padding: 120px 0;
  background: var(--dark);
  text-align: center;
  position: relative;
  overflow: hidden;
}
#cta::before {
  content: 'ichiwa';
  position: absolute;
  font-family: var(--font-en);
  font-size: 18vw;
  font-weight: 700;
  color: rgba(255,255,255,0.02);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  white-space: nowrap;
  pointer-events: none;
  font-style: italic;
}
.cta-label { margin-bottom: 16px; }
.cta-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--white);
  font-weight: 200;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}
.cta-title strong { font-weight: 700; }
.cta-desc {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 60px;
  line-height: 2;
}
.cta-tel {
  margin-bottom: 16px;
}
.cta-tel a {
  font-family: var(--font-en);
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 300;
  color: var(--white);
  letter-spacing: 0.05em;
  transition: color var(--transition);
}
.cta-tel a:hover { color: var(--brass); }
.cta-tel a::before { content: '📞 '; font-size: 0.6em; }
.cta-hours {
  font-size: 0.78rem;
  color: var(--stone);
  letter-spacing: 0.1em;
  margin-bottom: 48px;
}
.cta-divider {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--stone);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  margin-bottom: 48px;
}
.cta-divider::before,
.cta-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--iron);
}

/* Contact Form */
.contact-form {
  max-width: 640px;
  margin: 0 auto;
  text-align: left;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}
.form-label .req {
  color: var(--brass);
  margin-left: 4px;
  font-size: 0.65rem;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--iron);
  color: var(--white);
  padding: 14px 16px;
  font-size: 0.88rem;
  font-family: var(--font-jp);
  transition: border-color var(--transition);
  outline: none;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus { border-color: var(--brass); }
.form-select option { background: var(--charcoal); }
.form-textarea { height: 120px; resize: vertical; }
.form-submit {
  width: 100%;
  padding: 18px;
  background: var(--brass);
  color: var(--white);
  border: none;
  font-family: var(--font-jp);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: background var(--transition);
  margin-top: 8px;
}
.form-submit:hover { background: var(--brass-light); }
.form-note {
  font-size: 0.72rem;
  color: var(--stone);
  text-align: center;
  margin-top: 16px;
  line-height: 1.8;
}

/* ── Footer ── */
footer {
  background: #0a0a0a;
  padding: 60px 0 32px;
  color: var(--stone);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 48px;
}
.footer-brand .logo-en {
  font-size: 1.8rem;
  margin-bottom: 8px;
  display: block;
}
.footer-brand .logo-ja {
  font-size: 0.65rem;
  color: var(--brass);
  letter-spacing: 0.2em;
  margin-bottom: 20px;
  display: block;
}
.footer-desc {
  font-size: 0.78rem;
  line-height: 2;
  max-width: 260px;
}
.footer-col-title {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--cream);
  text-transform: uppercase;
  margin-bottom: 20px;
  font-family: var(--font-en);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: 0.8rem;
  color: var(--stone);
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-links a::before { content: '—'; font-size: 0.6rem; }
.footer-links a:hover { color: var(--cream); }
.footer-info { display: flex; flex-direction: column; gap: 10px; }
.footer-info-item {
  font-size: 0.78rem;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.footer-info-item dt { color: var(--brass); font-size: 0.65rem; letter-spacing: 0.15em; }
.footer-bottom {
  border-top: 1px solid var(--iron);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding: 0 24px; }
  #header { padding: 20px 24px; }
  #header.scrolled { padding: 14px 24px; }
  nav { display: none; }

  .hero-title { font-size: 2.2rem; }
  .hero-actions { flex-direction: column; }

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

  .works-grid {
    grid-template-columns: 1fr 1fr;
  }
  .work-item { grid-column: auto !important; grid-row: auto !important; }
  .work-item::before { padding-top: 80%; }

  .philosophy-inner { grid-template-columns: 1fr; gap: 48px; }
  .philosophy-badge { left: 0; bottom: -16px; }

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

  .reasons-grid { grid-template-columns: 1fr; gap: 0; }

  .flow-steps { flex-direction: column; gap: 0; }
  .flow-steps::before { display: none; }
  .flow-step { display: flex; gap: 20px; text-align: left; padding: 20px 0; border-bottom: 1px solid var(--sand); }
  .step-num { flex-shrink: 0; margin: 0; width: 48px; height: 48px; font-size: 0.85rem; }

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

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

  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  .works-header { flex-direction: column; align-items: flex-start; gap: 20px; }

  .hero-scroll { display: none; }
}