/* =========================================================
   ZERO BUILD ONE, Inc.  Corporate Site Styles
   ========================================================= */

:root {
  --navy-900: #0a1322;
  --navy-800: #0f1b2d;
  --navy-700: #152538;
  --navy-600: #1f2f45;
  --ink: #0f1b2d;
  --ink-soft: #2b384a;
  --ink-mute: #5a6b7a;
  --ink-faint: #8a98a7;
  --line: #e3e8ef;
  --line-soft: #eef1f5;
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --bg-cream: #faf9f5;
  --gold: #b99a56;
  --gold-soft: #d6bd86;

  /* Best-Match palette (subtle accents) */
  --spark-hopper: #f5c518;    /* Rising Hopper */
  --spark-rabbit: #e5524b;    /* RabbitTank — red */
  --spark-tank:   #2a6fc9;    /* RabbitTank — blue */

  --font-jp: "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --font-jp-serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-en: "Inter", "Helvetica Neue", Arial, sans-serif;

  --container: 1180px;
  --radius: 4px;
  --shadow-sm: 0 1px 2px rgba(15, 27, 45, 0.04), 0 1px 1px rgba(15, 27, 45, 0.03);
  --shadow-md: 0 4px 16px rgba(15, 27, 45, 0.06), 0 2px 4px rgba(15, 27, 45, 0.04);
  --shadow-lg: 0 20px 60px rgba(15, 27, 45, 0.08), 0 8px 20px rgba(15, 27, 45, 0.05);

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --header-h: 76px;
}

/* --------- Base --------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  font-family: var(--font-jp);
  font-weight: 400;
  font-feature-settings: "palt" 1;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; transition: color .2s var(--ease), opacity .2s var(--ease); }
a:hover { opacity: .75; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
button { font: inherit; cursor: pointer; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
@media (min-width: 768px) {
  .container { padding: 0 40px; }
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--navy-800); color: #fff; padding: 8px 16px; z-index: 1000;
}
.skip-link:focus { left: 8px; top: 8px; }

.pc-only { display: none; }
@media (min-width: 768px) {
  .pc-only { display: inline; }
}

/* --------- Buttons --------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 0 32px;
  font-family: var(--font-jp);
  font-weight: 500; letter-spacing: .04em;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform .25s var(--ease), background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
  white-space: nowrap;
}
.btn:hover { opacity: 1; transform: translateY(-1px); }
.btn-primary {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.btn-primary:hover {
  background: var(--navy-700);
  border-color: var(--navy-700);
  box-shadow: var(--shadow-md);
}
.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.5);
}
.btn-ghost:hover {
  background: rgba(255,255,255,.08);
  border-color: #fff;
}
.btn-block { width: 100%; }

/* --------- Header --------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0);
  transition: background .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(255,255,255,.96);
  backdrop-filter: saturate(1.2) blur(8px);
  -webkit-backdrop-filter: saturate(1.2) blur(8px);
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h);
}

.brand {
  display: flex; align-items: center; gap: 12px;
  color: #fff;
}
.site-header.is-scrolled .brand { color: var(--ink); }
.brand-mark { display: inline-flex; align-items: center; }
.brand-text { display: inline-flex; flex-direction: column; line-height: 1.1; }
.brand-en {
  font-family: var(--font-en);
  font-weight: 600;
  letter-spacing: .08em;
  font-size: 15px;
}
.brand-jp {
  font-size: 11px;
  letter-spacing: .18em;
  margin-top: 2px;
  opacity: .82;
}

.site-nav { display: none; }
.site-nav ul { display: flex; gap: 36px; }
.site-nav a {
  color: #fff;
  font-size: 14px;
  letter-spacing: .08em;
  position: relative;
  padding: 8px 0;
}
.site-nav a::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 4px;
  height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: left;
  transition: transform .3s var(--ease);
}
.site-nav a:hover { opacity: 1; }
.site-nav a:hover::after { transform: scaleX(1); }
.site-header.is-scrolled .site-nav a { color: var(--ink); }

@media (min-width: 960px) {
  .site-nav { display: block; }
}

.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px;
  background: transparent; border: none; padding: 0;
}
.nav-toggle span {
  display: block; width: 22px; height: 1.5px; background: #fff;
  transition: transform .3s var(--ease), opacity .3s var(--ease), background .3s var(--ease);
  margin: 0 auto;
}
.site-header.is-scrolled .nav-toggle span { background: var(--ink); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (min-width: 960px) {
  .nav-toggle { display: none; }
}

.mobile-nav {
  position: fixed; top: var(--header-h); left: 0; right: 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
  max-height: 0; overflow: hidden;
  transition: max-height .4s var(--ease);
}
.mobile-nav.is-open { max-height: 400px; }
.mobile-nav ul { padding: 16px 24px 24px; }
.mobile-nav a {
  display: block; padding: 14px 0;
  color: var(--ink);
  border-bottom: 1px solid var(--line-soft);
  letter-spacing: .08em;
}

/* --------- Hero --------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}
.hero-bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse at 70% 30%, rgba(185, 154, 86, .12), transparent 55%),
    linear-gradient(180deg, var(--navy-800) 0%, var(--navy-900) 100%);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 85%);
}
.hero-glow {
  position: absolute; top: 20%; left: 55%;
  width: 50vw; height: 50vw; max-width: 600px; max-height: 600px;
  background: radial-gradient(circle, rgba(185,154,86,.18), transparent 70%);
  filter: blur(20px);
  border-radius: 50%;
}

.hero-inner {
  padding: calc(var(--header-h) + 40px) 24px 120px;
}
@media (min-width: 768px) {
  .hero-inner { padding: calc(var(--header-h) + 60px) 40px 140px; }
}

.hero-eyebrow {
  font-family: var(--font-en);
  letter-spacing: .3em;
  font-size: 12px;
  font-weight: 500;
  color: var(--gold-soft);
  margin-bottom: 28px;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeUp .8s var(--ease) .1s forwards;
}
.hero-title {
  font-family: var(--font-jp-serif);
  font-weight: 600;
  font-size: clamp(36px, 7vw, 72px);
  line-height: 1.3;
  letter-spacing: .02em;
  margin-bottom: 32px;
}
.hero-title .line {
  display: block;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp .9s var(--ease) forwards;
}
.hero-title .line:nth-child(1) { animation-delay: .25s; }
.hero-title .line:nth-child(2) { animation-delay: .45s; color: var(--gold-soft); }

.hero-sub {
  font-family: var(--font-jp-serif);
  font-style: italic;
  font-size: clamp(12px, 1.3vw, 14px);
  letter-spacing: .22em;
  color: var(--gold-soft);
  margin-bottom: 36px;
  opacity: 0;
  animation: fadeUp .8s var(--ease) .6s forwards;
}

.hero-lead {
  max-width: 640px;
  font-size: clamp(14px, 1.7vw, 16px);
  line-height: 2;
  color: rgba(255,255,255,.82);
  margin-bottom: 48px;
  opacity: 0;
  animation: fadeUp .8s var(--ease) .78s forwards;
}
.hero-cta {
  display: flex; flex-wrap: wrap; gap: 16px;
  opacity: 0;
  animation: fadeUp .8s var(--ease) .95s forwards;
}

.hero-scroll {
  position: absolute; left: 50%; bottom: 36px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  font-family: var(--font-en);
  font-size: 10px; letter-spacing: .3em;
  color: rgba(255,255,255,.5);
}
.hero-scroll-line {
  width: 1px; height: 36px; overflow: hidden; position: relative;
}
.hero-scroll-line::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(255,255,255,.8), transparent);
  animation: scrollLine 2s infinite;
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes scrollLine {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

/* --------- Section common --------- */
section { position: relative; }
section[id] { scroll-margin-top: var(--header-h); }

.about, .services, .company, .contact {
  padding: 100px 0;
}
@media (min-width: 768px) {
  .about, .services, .company, .contact {
    padding: 140px 0;
  }
}

.section-head { text-align: center; margin-bottom: 64px; }
.section-eyebrow {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 14px;
  font-weight: 500;
}
.section-title {
  font-family: var(--font-jp-serif);
  font-size: clamp(28px, 4.2vw, 40px);
  font-weight: 600;
  letter-spacing: .08em;
  margin-bottom: 20px;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: "";
  display: block;
  width: 48px; height: 2px;
  background: linear-gradient(90deg, var(--spark-hopper), var(--spark-rabbit), var(--spark-tank));
  margin: 20px auto 0;
  border-radius: 2px;
  opacity: .82;
}
.section-lead {
  color: var(--ink-mute);
  font-size: 15px;
  line-height: 2;
  max-width: 640px;
  margin: 0 auto;
}

/* --------- About --------- */
.about { background: var(--bg-cream); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 60px;
  align-items: start;
}
@media (min-width: 960px) {
  .about-grid { grid-template-columns: 1fr 1fr; gap: 80px; }
}

.about-kicker {
  font-family: var(--font-jp-serif);
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 28px;
  letter-spacing: .06em;
}
.about-text {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 2.1;
  margin-bottom: 20px;
}

.values { display: flex; flex-direction: column; gap: 28px; }
.values li {
  padding: 28px 32px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  position: relative;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.values li:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.values-num {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
  display: block;
  margin-bottom: 12px;
}
.values h3 {
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: .04em;
}
.values-jp {
  font-size: 13px;
  color: var(--ink-mute);
  margin-bottom: 12px;
  letter-spacing: .12em;
}
.values-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.9;
}

/* --------- Services --------- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
@media (min-width: 640px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .services-grid { grid-template-columns: repeat(3, 1fr); }
}

.service-card {
  background: #fff;
  padding: 44px 32px;
  display: flex; flex-direction: column;
  position: relative;
  transition: background .3s var(--ease), transform .3s var(--ease);
}
.service-card::before {
  content: "";
  position: absolute; left: 0; top: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--spark-hopper), var(--spark-rabbit), var(--spark-tank));
  transform: scaleX(0); transform-origin: left;
  transition: transform .4s var(--ease);
}
.service-card:hover { background: var(--bg-soft); }
.service-card:hover::before { transform: scaleX(1); }

.service-num {
  font-family: var(--font-en);
  font-size: 12px;
  color: var(--gold);
  letter-spacing: .2em;
  margin-bottom: 16px;
  font-weight: 500;
}
.service-icon {
  color: var(--navy-700);
  width: 44px; height: 44px;
  margin-bottom: 20px;
}
.service-icon svg { width: 100%; height: 100%; }
.service-card h3 {
  font-family: var(--font-jp-serif);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 14px;
  line-height: 1.6;
  letter-spacing: .04em;
}
.service-card p {
  color: var(--ink-mute);
  font-size: 14px;
  line-height: 1.9;
}

/* --------- Company --------- */
.company { background: var(--bg-cream); }
.company-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 32px;
  max-width: 920px;
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}
@media (min-width: 768px) {
  .company-card { padding: 16px 48px; }
}
.company-list { margin: 0; }
.company-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line-soft);
}
.company-row:last-child { border-bottom: none; }
@media (min-width: 768px) {
  .company-row {
    grid-template-columns: 200px 1fr;
    gap: 32px;
    padding: 28px 0;
  }
}
.company-row dt {
  font-weight: 500;
  color: var(--ink);
  letter-spacing: .08em;
  font-size: 14px;
  padding-top: 2px;
}
.company-row dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.9;
}
.company-row dd .sub {
  display: inline-block;
  font-size: 12px;
  color: var(--ink-mute);
  margin-left: 8px;
  letter-spacing: .1em;
}
.purpose-list {
  list-style: decimal;
  padding-left: 1.2em;
  margin: 0;
}
.purpose-list li {
  list-style: decimal;
  padding: 6px 0 6px 6px;
  line-height: 1.85;
  font-size: 14.5px;
}

/* --------- Contact --------- */
.contact { background: #fff; }
.contact-card {
  max-width: 720px; margin: 0 auto;
  background: var(--bg-cream);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px 28px;
  box-shadow: var(--shadow-sm);
}
@media (min-width: 768px) {
  .contact-card { padding: 56px 64px; }
}

.contact-form { display: flex; flex-direction: column; gap: 24px; }
.form-row { display: flex; flex-direction: column; gap: 8px; }
.form-row label {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--ink);
  font-weight: 500;
}
.req {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 2px;
  margin-left: 6px;
  letter-spacing: .1em;
  font-weight: 500;
}
.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  padding: 14px 16px;
  font: inherit;
  font-size: 14px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
  font-family: var(--font-jp);
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--navy-700);
  box-shadow: 0 0 0 3px rgba(15, 27, 45, .08);
}
.form-row textarea { resize: vertical; min-height: 160px; }
.form-note {
  font-size: 12px;
  color: var(--ink-mute);
  line-height: 1.8;
}
.form-note a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.form-submit { margin-top: 8px; }

/* --------- Footer --------- */
.site-footer {
  background: var(--navy-900);
  color: rgba(255,255,255,.8);
  padding: 72px 0 0;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  padding-bottom: 56px;
}
@media (min-width: 768px) {
  .footer-inner { grid-template-columns: 1fr 1.2fr; gap: 64px; }
}
.footer-logo {
  font-family: var(--font-en);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: .12em;
  color: #fff;
  margin-bottom: 6px;
}
.footer-sub {
  font-size: 12px;
  letter-spacing: .2em;
  color: rgba(255,255,255,.6);
  margin-bottom: 20px;
}
.footer-tag {
  font-family: var(--font-jp-serif);
  font-size: 15px;
  color: var(--gold-soft);
  letter-spacing: .08em;
}
.footer-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
@media (min-width: 640px) {
  .footer-meta { grid-template-columns: 1fr 1fr; gap: 40px; }
}
.footer-address {
  font-style: normal;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(255,255,255,.7);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: 13px;
  letter-spacing: .08em;
  color: rgba(255,255,255,.75);
}
.footer-links a:hover { color: var(--gold-soft); opacity: 1; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 20px 0;
}
.footer-bottom small {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(255,255,255,.5);
}

/* --------- Reveal animations --------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .9s var(--ease), transform .9s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}