/* ============================================================
   TealTrust Inc. — styles
   Light editorial / light-luxury. Teal accent, Mincho display.
   ============================================================ */

:root {
  /* palette */
  --paper: oklch(98.4% 0.006 95);      /* warm off-white */
  --paper-2: oklch(96% 0.008 95);      /* faint sand */
  --ink: oklch(24% 0.012 240);         /* near-black text */
  --ink-soft: oklch(44% 0.012 240);    /* muted body */
  --line: oklch(88% 0.008 200 / 1);    /* hairline */

  --teal: oklch(52% 0.09 200);         /* primary accent */
  --teal-deep: oklch(38% 0.07 205);    /* dark teal surface */
  --teal-ink: oklch(28% 0.05 205);     /* darkest teal */
  --teal-tint: oklch(94% 0.03 200);    /* teal wash */

  /* type */
  --font-serif: "Shippori Mincho", "Noto Serif JP", serif;
  --font-sans: "Noto Sans JP", "Manrope", system-ui, sans-serif;
  --font-latin: "Manrope", var(--font-sans);

  --text-eyebrow: 0.78rem;
  --text-hero: clamp(2.8rem, 1.2rem + 7vw, 6.5rem);
  --text-h2: clamp(1.9rem, 1.1rem + 3vw, 3.2rem);
  --text-h3: clamp(1.35rem, 1.05rem + 1vw, 1.7rem);
  --text-lead: clamp(1.02rem, 0.95rem + 0.4vw, 1.2rem);
  --text-body: 1rem;

  /* space */
  --wrap: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(4.5rem, 3rem + 7vw, 9rem);

  /* motion */
  --dur: 0.6s;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  --radius: 4px;
  --shadow-soft: 0 1px 2px oklch(24% 0.01 240 / 0.04), 0 12px 30px -12px oklch(24% 0.02 240 / 0.14);
}

/* ---------- base ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.85;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3 { font-weight: 600; line-height: 1.28; margin: 0; letter-spacing: 0.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
em { font-style: normal; color: var(--teal); font-weight: 500; }

.wrap { width: min(100% - var(--gutter) * 2, var(--wrap)); margin-inline: auto; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 999;
  background: var(--ink); color: var(--paper); padding: 0.6em 1em;
}
.skip-link:focus { left: 1rem; top: 1rem; }

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

/* ---------- buttons ---------- */
.btn {
  --_bg: transparent;
  display: inline-flex; align-items: center; gap: 0.55em;
  font-family: var(--font-latin);
  font-size: 0.92rem; font-weight: 600; letter-spacing: 0.02em;
  padding: 0.85em 1.6em; border-radius: 100px;
  border: 1px solid transparent;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
              color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
  cursor: pointer; white-space: nowrap;
}
.btn .arrow { transition: transform var(--dur) var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }
.btn-lg { padding: 1.05em 2.1em; font-size: 1rem; }

.btn-primary {
  background: var(--teal-ink); color: var(--paper);
  box-shadow: var(--shadow-soft);
}
.btn-primary:hover { background: var(--teal); transform: translateY(-2px); }

.btn-ghost { border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal); transform: translateY(-2px); }

.btn-ghost-light { border-color: oklch(100% 0 0 / 0.35); color: var(--paper); }
.btn-ghost-light:hover { border-color: var(--paper); transform: translateY(-2px); }

.btn-contact {
  background: transparent; color: var(--ink);
  border-color: var(--line); padding: 0.62em 1.3em;
}
.btn-contact:hover { border-color: var(--teal); color: var(--teal); }

/* ---------- header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: oklch(98.4% 0.006 95 / 0.82);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom-color: var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 74px; gap: 1.5rem;
}

.brand { display: inline-flex; align-items: center; gap: 0.6rem; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background:
    radial-gradient(circle at 30% 28%, oklch(72% 0.1 200) 0 38%, transparent 40%),
    linear-gradient(135deg, var(--teal) 0%, var(--teal-ink) 100%);
  box-shadow: inset 0 0 0 1px oklch(100% 0 0 / 0.18);
}
.brand-mark.small { width: 20px; height: 20px; border-radius: 6px; }
.brand-text {
  font-family: var(--font-latin); font-weight: 700; font-size: 1.18rem;
  letter-spacing: 0.01em; color: var(--ink);
}
.brand-sub {
  font-size: 0.62em; font-weight: 500; color: var(--teal);
  margin-left: 0.35em; letter-spacing: 0.14em; vertical-align: 0.15em;
}

.site-nav ul { display: flex; gap: clamp(1rem, 2.4vw, 2.4rem); }
.site-nav a {
  position: relative; font-size: 0.92rem; font-weight: 500; color: var(--ink-soft);
  padding: 0.4em 0; transition: color var(--dur) var(--ease);
}
.site-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--teal); transition: width var(--dur) var(--ease);
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after { width: 100%; }

.nav-toggle { display: none; }

/* mobile nav */
.mobile-nav {
  position: fixed; inset: 74px 0 auto 0; z-index: 99;
  background: oklch(98.4% 0.006 95 / 0.97);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  padding: 1rem var(--gutter) 2rem;
}
.mobile-nav ul { display: flex; flex-direction: column; }
.mobile-nav a {
  display: block; padding: 1rem 0; font-size: 1.05rem; font-weight: 500;
  border-bottom: 1px solid var(--line); color: var(--ink);
}
.mobile-nav .mobile-contact { color: var(--teal); font-weight: 700; border-bottom: none; }

/* ---------- hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding-top: 74px; overflow: hidden;
  background:
    radial-gradient(120% 90% at 85% 0%, var(--teal-tint) 0%, transparent 55%),
    radial-gradient(90% 70% at 5% 100%, var(--paper-2) 0%, transparent 60%),
    var(--paper);
}
.hero-grain {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
}
.hero-inner { position: relative; padding-block: clamp(3rem, 8vh, 6rem); }

.eyebrow {
  font-family: var(--font-latin); font-size: var(--text-eyebrow);
  font-weight: 600; letter-spacing: 0.32em; text-transform: uppercase;
  color: var(--teal); margin-bottom: 1.6rem;
  display: inline-flex; align-items: center; gap: 0.9rem;
}
.eyebrow::before {
  content: ""; width: 34px; height: 1px; background: var(--teal); display: inline-block;
}

.hero-title {
  font-family: var(--font-serif); font-weight: 600;
  font-size: var(--text-hero); line-height: 1.06; letter-spacing: 0.005em;
  margin-bottom: 1.8rem;
}
.hero-title span { display: block; }
.hero-title .accent {
  color: var(--teal);
  position: relative; width: max-content;
}
.hero-lead {
  font-size: var(--text-lead); color: var(--ink-soft);
  max-width: 40ch; margin-bottom: 2.6rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-bottom: 3.4rem; }

.hero-index {
  display: flex; flex-wrap: wrap; gap: clamp(1.2rem, 4vw, 3.2rem);
  padding-top: 1.8rem; border-top: 1px solid var(--line);
  font-family: var(--font-latin); font-weight: 600; letter-spacing: 0.04em;
  color: var(--ink);
}
.hero-index li { display: flex; align-items: baseline; gap: 0.6rem; }
.hero-index .idx {
  font-size: 0.72rem; color: var(--teal); letter-spacing: 0.1em;
}

.scroll-cue {
  position: absolute; left: 50%; bottom: 1.6rem; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
  font-family: var(--font-latin); font-size: 0.65rem; letter-spacing: 0.28em;
  text-transform: uppercase; color: var(--ink-soft);
}
.scroll-cue i {
  width: 1px; height: 42px; background: linear-gradient(var(--teal), transparent);
  position: relative; overflow: hidden;
}
.scroll-cue i::after {
  content: ""; position: absolute; top: -50%; left: 0; width: 100%; height: 50%;
  background: var(--teal); animation: cue 2.2s var(--ease) infinite;
}
@keyframes cue { to { top: 130%; } }

/* ---------- sections ---------- */
.section { padding-block: var(--section-y); position: relative; }

.section-head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-head.center { text-align: center; }
.section-label {
  font-family: var(--font-latin); font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.24em; text-transform: uppercase; color: var(--teal);
  display: inline-flex; align-items: center; gap: 0.7rem; margin-bottom: 1rem;
}
.section-label.light { color: oklch(80% 0.06 200); }
.section-head.center .section-label { justify-content: center; }
.label-no {
  font-size: 0.7rem; color: var(--ink-soft); opacity: 0.7;
  padding-right: 0.7rem; border-right: 1px solid var(--line);
}
.section-label.light .label-no { color: oklch(78% 0.02 200); border-color: oklch(100% 0 0 / 0.2); }

.section-title {
  font-family: var(--font-serif); font-size: var(--text-h2); color: var(--ink);
}
.section-title.light { color: var(--paper); }
.section-sub { margin-top: 1rem; color: var(--ink-soft); font-size: var(--text-lead); }

/* ---------- about ---------- */
.about-grid {
  display: grid; grid-template-columns: 0.35fr 1fr; gap: clamp(1.5rem, 5vw, 4rem);
}
.about-grid .section-head { margin-bottom: 0; }
.about-body .section-title { margin-bottom: 1.8rem; }
.about-text { color: var(--ink-soft); max-width: 60ch; }
.about-text + .about-text { margin-top: 1.3rem; }

/* ---------- services ---------- */
.service-list {
  display: grid; gap: 0;
  border-top: 1px solid var(--line);
}
.service {
  display: grid; grid-template-columns: minmax(90px, 0.24fr) 1fr;
  gap: clamp(1rem, 4vw, 3.5rem);
  padding-block: clamp(2rem, 4vw, 3.2rem);
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}
.service:hover { background: var(--paper-2); }
.service-no {
  font-family: var(--font-latin); font-weight: 700;
  font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1;
  color: var(--teal); opacity: 0.9; letter-spacing: 0.02em;
}
.service-title {
  font-family: var(--font-serif); font-size: var(--text-h3);
  margin-bottom: 1rem; color: var(--ink);
}
.service-desc { color: var(--ink-soft); max-width: 62ch; margin-bottom: 1.5rem; }
.tag-list { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.tag-list li {
  font-size: 0.84rem; font-weight: 500; color: var(--teal-ink);
  background: var(--teal-tint); border: 1px solid oklch(88% 0.03 200);
  padding: 0.4em 0.95em; border-radius: 100px;
}

/* ---------- strengths (dark teal band) ---------- */
.strengths {
  background:
    radial-gradient(100% 120% at 100% 0%, var(--teal-deep) 0%, transparent 55%),
    var(--teal-ink);
  color: var(--paper);
}
.strength-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}
.strength {
  padding: 2.2rem 1.8rem 2rem;
  border: 1px solid oklch(100% 0 0 / 0.12); border-radius: var(--radius);
  background: oklch(100% 0 0 / 0.03);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.strength:hover {
  transform: translateY(-4px); background: oklch(100% 0 0 / 0.06);
  border-color: oklch(80% 0.08 200 / 0.5);
}
.strength-no {
  font-family: var(--font-latin); font-weight: 700; font-size: 0.85rem;
  letter-spacing: 0.1em; color: oklch(82% 0.1 200); margin-bottom: 1.4rem;
}
.strength h3 {
  font-family: var(--font-serif); font-size: 1.4rem; margin-bottom: 0.8rem;
  color: var(--paper);
}
.strength p { color: oklch(88% 0.01 200); font-size: 0.96rem; }

/* ---------- company ---------- */
.company-grid {
  display: grid; grid-template-columns: 0.35fr 1fr; gap: clamp(1.5rem, 5vw, 4rem);
}
.company-grid .section-head { margin-bottom: 0; }
.company-table { border-top: 1px solid var(--line); }
.company-table .row {
  display: grid; grid-template-columns: minmax(120px, 0.24fr) 1fr;
  gap: 1.5rem; padding-block: 1.2rem; border-bottom: 1px solid var(--line);
}
.company-table dt { font-weight: 700; color: var(--ink); font-size: 0.95rem; }
.company-table dd { margin: 0; color: var(--ink-soft); }
.dd-link {
  color: var(--teal); font-weight: 500;
  border-bottom: 1px solid oklch(88% 0.03 200);
  transition: border-color var(--dur) var(--ease);
}
.dd-link:hover { border-color: var(--teal); }
.company-table .note {
  display: inline-block; margin-left: 0.6rem; font-size: 0.8rem;
  color: var(--teal); opacity: 0.85;
}

/* ---------- contact ---------- */
.contact {
  text-align: center;
  background:
    radial-gradient(90% 120% at 50% 0%, var(--teal-tint) 0%, transparent 60%),
    var(--paper-2);
}
.contact-inner { max-width: 720px; margin-inline: auto; }
.center-label { justify-content: center; }
.section-label.light.center-label { color: var(--teal); }
.section-label.light.center-label .label-no { color: var(--ink-soft); border-color: var(--line); }
.contact-title {
  font-family: var(--font-serif); font-size: var(--text-h2);
  margin: 1rem 0 1.4rem; color: var(--ink);
}
.contact-lead { color: var(--ink-soft); font-size: var(--text-lead); margin-bottom: 2.4rem; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; justify-content: center; }
.contact-note { margin-top: 1.8rem; font-size: 0.82rem; color: var(--ink-soft); opacity: 0.8; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--ink); color: oklch(88% 0.01 240);
  padding-block: clamp(2.5rem, 5vw, 3.5rem);
}
.footer-inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1.5rem;
}
.footer-brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-latin); font-weight: 600; color: var(--paper);
}
.footer-nav { display: flex; flex-wrap: wrap; gap: clamp(0.9rem, 2.5vw, 1.8rem); }
.footer-nav a {
  font-size: 0.88rem; color: oklch(80% 0.01 240);
  transition: color var(--dur) var(--ease);
}
.footer-nav a:hover { color: var(--paper); }
.copyright {
  width: 100%; padding-top: 1.5rem; margin-top: 0.5rem;
  border-top: 1px solid oklch(100% 0 0 / 0.1);
  font-family: var(--font-latin); font-size: 0.78rem; letter-spacing: 0.04em;
  color: oklch(70% 0.01 240);
}

/* ---------- reveal animation ---------- */
.reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  transition-delay: var(--d, 0s);
}
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-cue i::after { animation: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .site-nav, .btn-contact { display: none; }
  .nav-toggle {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 44px; height: 44px; background: none; border: none; cursor: pointer;
  }
  .nav-toggle span {
    display: block; width: 24px; height: 2px; background: var(--ink);
    transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
    margin-inline: auto;
  }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .about-grid, .company-grid { grid-template-columns: 1fr; }
  .strength-grid { grid-template-columns: 1fr; }
  .service { grid-template-columns: 1fr; gap: 0.8rem; }
  .service-no { font-size: 2rem; }
}

@media (max-width: 520px) {
  .hero-actions .btn, .contact-actions .btn { flex: 1 1 auto; justify-content: center; }
  .company-table .row { grid-template-columns: 1fr; gap: 0.3rem; }
}