/* ============================================================
   TSURU — Platform Lifts
   Design tokens
   ============================================================ */
:root {
  --bg:        #ffffff;
  --bg-soft:   #f7f6f2;
  --ink:       #111111;
  --ink-soft:  #55534d;
  --ink-faint: #8a8880;
  --line:      #dedad0;
  --accent:    #ad2b2b;

  --font-display: 'Shippori Mincho', serif;
  --font-body:    'Noto Sans JP', sans-serif;

  --max: 1120px;
  --gutter: clamp(1.5rem, 5vw, 4rem);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.01em;
}

p { margin: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ============================================================
   Shared layout helpers
   ============================================================ */
.section-head {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.section-kicker {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  max-width: 22ch;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.9rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid var(--ink);
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
  cursor: pointer;
}

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

.btn-ghost {
  background: transparent;
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.1rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--accent);
}

.brand-word {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.12em;
}

.main-nav {
  display: flex;
  gap: clamp(1.2rem, 3vw, 2.4rem);
}

.main-nav a {
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 0.2rem;
}

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

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transition: right 200ms ease;
}
.main-nav a:hover::after { right: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px;
  height: 34px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  width: 100%;
  height: 1px;
  background: var(--ink);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3.5rem, 9vw, 7rem) var(--gutter) 0;
}

.hero-inner { max-width: 640px; }

.hero-eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.15;
}

.hero-lede {
  margin-top: 1.6rem;
  max-width: 46ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2.4rem;
}

.hero-line {
  margin-top: clamp(3rem, 8vw, 5rem);
  width: 100%;
}
.hero-line svg {
  width: 100%;
  height: clamp(90px, 16vw, 180px);
  display: block;
}
.hero-line path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}
.hero-line circle {
  fill: var(--accent);
}

/* ============================================================
   Philosophy
   ============================================================ */
.philosophy {
  padding: clamp(4rem, 10vw, 7rem) 0;
}

.principle-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(2rem, 4vw, 3rem);
}

.principle {
  border-top: 1px solid var(--line);
  padding-top: 1.6rem;
}

.principle:nth-child(2) { margin-top: clamp(1.5rem, 4vw, 2.6rem); }

.principle-glyph {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--accent);
  display: block;
  margin-bottom: 1rem;
}

.principle h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.7rem;
}

.principle p {
  color: var(--ink-soft);
  font-size: 0.96rem;
}

/* ============================================================
   Models / spec table
   ============================================================ */
.models {
  padding: clamp(4rem, 10vw, 7rem) 0;
  background: var(--bg-soft);
}

.model-table {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.model-row {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1.4fr;
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.model-row--head span {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.model-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.model-note {
  max-width: var(--max);
  margin: 1.6rem auto 0;
  padding: 0 var(--gutter);
  color: var(--ink-soft);
  font-size: 0.9rem;
}

/* ============================================================
   Gallery
   ============================================================ */
.gallery {
  padding: clamp(4rem, 10vw, 7rem) 0;
}

.gallery-toggle {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  gap: 0.6rem;
  margin-bottom: 2.6rem;
}

.toggle-btn {
  font-family: var(--font-body);
  font-size: 0.88rem;
  padding: 0.55rem 1.3rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 160ms ease;
}

.toggle-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.toggle-btn.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}

.gallery-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
}

.gallery-item {
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.gallery-item img,
.gallery-item video {
  width: 100%;
  height: auto;
  object-fit: contain;
  background: var(--bg-soft);
}

.gallery-item figcaption {
  padding: 0.9rem 1rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.gallery-item[hidden] { display: none; }

.gallery-empty {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  color: var(--ink-faint);
  font-size: 0.95rem;
}

.gallery-note {
  max-width: var(--max);
  margin: 2.4rem auto 0;
  padding: 1.2rem var(--gutter);
  border-top: 1px dashed var(--line);
  color: var(--ink-faint);
  font-size: 0.85rem;
}
.gallery-note code {
  background: var(--bg-soft);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.82rem;
}

/* ============================================================
   Contact
   ============================================================ */
.contact {
  padding: clamp(4rem, 10vw, 7rem) 0 clamp(5rem, 10vw, 8rem);
  background: var(--bg-soft);
}

.contact-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(2.5rem, 6vw, 5rem);
}

.contact-info dl { margin: 0; }

.contact-row {
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
}
.contact-row:last-child { border-bottom: 1px solid var(--line); }

.contact-row dt {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}
.contact-row dd {
  margin: 0;
}
.contact-row a { text-decoration: none; border-bottom: 1px solid var(--line); }
.contact-row a:hover { border-color: var(--accent); color: var(--accent); }

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.contact-form label {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.contact-form input,
.contact-form textarea {
  font-family: var(--font-body);
  font-size: 0.98rem;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.75rem 0.9rem;
  resize: vertical;
}

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

.contact-form .btn { align-self: flex-start; margin-top: 0.4rem; }

.form-status {
  font-size: 0.88rem;
  color: var(--accent);
  min-height: 1.2em;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  padding: 2.4rem var(--gutter);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--ink-faint);
  font-size: 0.85rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.footer-brand .brand-mark {
  font-family: var(--font-display);
  color: var(--accent);
}

/* ============================================================
   WhatsApp floating action button
   ============================================================ */
.whatsapp-fab {
  position: fixed;
  right: clamp(1.2rem, 4vw, 2.2rem);
  bottom: clamp(1.2rem, 4vw, 2.2rem);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(17, 17, 17, 0.25);
  z-index: 50;
  transition: transform 180ms ease, background-color 180ms ease;
}
.whatsapp-fab svg {
  width: 26px;
  height: 26px;
  fill: var(--bg);
}
.whatsapp-fab:hover {
  background: var(--accent);
  transform: translateY(-2px);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 860px) {
  .principle-grid { grid-template-columns: 1fr; gap: 2.2rem; }
  .principle:nth-child(2) { margin-top: 0; }
  .model-row { grid-template-columns: 1fr 1fr; row-gap: 0.3rem; }
  .model-row span:nth-child(3),
  .model-row span:nth-child(4) { grid-column: auto; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 1rem var(--gutter) 1.5rem;
    gap: 1rem;
    display: none;
  }
  .main-nav.is-open { display: flex; }
  .nav-toggle { display: flex; }
  .gallery-grid { grid-template-columns: 1fr; }
  .model-row { grid-template-columns: 1fr; }
}
.brand img {
  display: block;
  width: 80px;
  height: auto;
}