/* ============================================================
   TINKSEED — homepage
   Monochrome, crisp, type-led (Apple / Nike direction).
   A line-drawn sprout grows from a seed as the page scrolls.
   Fonts: Archivo (Latin) / Zen Kaku Gothic New (JP)
   ============================================================ */

:root {
  --bg: #fafafa;
  --ink: #0a0a0a;
  --ink-dim: #6f6f6f;
  --ink-faint: #b9b9b9;
  --line: rgba(10, 10, 10, 0.14);
  --band-bg: #0a0a0a;
  --band-ink: #fafafa;
  --band-dim: #9a9a9a;
  --band-line: rgba(250, 250, 250, 0.2);
  --font-latin: "Archivo", sans-serif;
  --font-jp: "Zen Kaku Gothic New", sans-serif;
  --pad: clamp(20px, 5vw, 72px);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-jp);
  font-size: 16px;
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--ink);
  color: var(--bg);
}

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

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

/* ---------- scroll-grown sprout ---------- */

.growth {
  position: fixed;
  right: clamp(12px, 4vw, 64px);
  bottom: 96px;
  width: clamp(240px, 31vw, 430px);
  height: calc(100vh - 96px);
  z-index: 0;
  pointer-events: none;
  color: var(--ink);
}

.growth svg {
  width: 100%;
  height: 100%;
  display: block;
}

.growth .draw {
  stroke: currentColor;
  stroke-width: 3;
  stroke-linecap: round;
}

.growth .root {
  stroke-width: 2.4;
}

.growth .root.fine {
  stroke-width: 1.5;
}

.growth .trunk {
  stroke-width: 3.2;
}

.growth .branch {
  stroke-width: 2.6;
}

.growth .twig {
  stroke-width: 2;
}

.growth .leaf {
  will-change: transform;
}

.growth .leaf use {
  fill: currentColor;
}

@media (max-width: 900px) {
  .growth {
    opacity: 0.22;
  }
}

@media (max-width: 720px) {
  .growth {
    display: none;
  }
}

main,
.site-header,
.site-footer,
.ticker {
  position: relative;
  z-index: 1;
}

/* ---------- header ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px var(--pad);
  transition: background 0.35s, border-color 0.35s;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(250, 250, 250, 0.86);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}

.brand {
  font-family: var(--font-latin);
  font-weight: 900;
  letter-spacing: 0.1em;
  font-size: 15px;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 38px);
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.nav a {
  position: relative;
  padding: 4px 0;
  color: var(--ink-dim);
  transition: color 0.25s;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1.5px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s var(--ease-out);
}

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

.nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-cta {
  border: 1.5px solid var(--ink);
  border-radius: 999px;
  padding: 8px 20px !important;
  color: var(--ink) !important;
  transition: background 0.25s, color 0.25s !important;
}

.nav-cta::after {
  display: none;
}

.nav-cta:hover {
  background: var(--ink);
  color: var(--bg) !important;
}

@media (max-width: 720px) {
  .nav a:not(.nav-cta) {
    display: none;
  }
}

/* ---------- hero ---------- */

.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px var(--pad) 40px;
}

.eyebrow {
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: clamp(20px, 3.5vh, 40px);
}

.hero-title {
  font-family: var(--font-jp);
  font-weight: 900;
  font-size: clamp(46px, 10.5vw, 132px);
  line-height: 1.12;
  letter-spacing: 0.005em;
}

.line {
  display: block;
  overflow: hidden;
  padding-bottom: 0.1em;
  margin-bottom: -0.1em;
}

.line-inner {
  display: inline-block;
}

.hero-lead {
  margin-top: clamp(24px, 4vh, 44px);
  max-width: 560px;
  color: var(--ink-dim);
  font-size: clamp(14px, 1.6vw, 16px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(28px, 4.5vh, 48px);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-jp);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 15px 32px;
  border-radius: 999px;
  border: 1.5px solid var(--ink);
  transition: background 0.3s, color 0.3s, transform 0.3s var(--ease-out);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-solid {
  background: var(--ink);
  color: var(--bg);
}

.btn-solid:hover {
  background: #2c2c2c;
  border-color: #2c2c2c;
}

.btn-ghost:hover {
  background: var(--ink);
  color: var(--bg);
}

.btn-arrow {
  transition: transform 0.3s var(--ease-out);
}

.btn:hover .btn-arrow {
  transform: translateX(5px);
}

.hero-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-top: auto;
  padding-top: 48px;
}

.foot-deco {
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.scroll-bar {
  width: 1.5px;
  height: 44px;
  background: var(--line);
  position: relative;
  overflow: hidden;
}

.scroll-bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: -100%;
  width: 100%;
  height: 100%;
  background: var(--ink);
  animation: scroll-drip 2.2s var(--ease-out) infinite;
}

@keyframes scroll-drip {
  0% { top: -100%; }
  55%, 100% { top: 100%; }
}

/* ---------- load reveal ---------- */

.reveal-load {
  opacity: 0;
  transform: translateY(110%);
  animation: rise 1.1s var(--ease-out) forwards;
  animation-delay: calc(var(--d) * 0.13s + 0.15s);
}

p.reveal-load,
div.reveal-load {
  transform: translateY(28px);
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- ticker ---------- */

.ticker {
  background: var(--band-bg);
  color: var(--band-ink);
  overflow: hidden;
  padding: 14px 0;
}

.ticker-track {
  display: flex;
  align-items: center;
  gap: 44px;
  width: max-content;
  font-family: var(--font-latin);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  animation: ticker-run 24s linear infinite;
}

.ticker-track span {
  white-space: nowrap;
}

.ticker-track i {
  width: 7px;
  height: 7px;
  background: var(--band-ink);
  border-radius: 50%;
  flex: none;
}

@keyframes ticker-run {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- sections ---------- */

.section {
  padding: clamp(84px, 14vh, 160px) var(--pad);
  max-width: 1200px;
  margin: 0 auto;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 22px;
  margin-bottom: clamp(40px, 7vh, 72px);
}

.section-no {
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
}

.band .section-no {
  color: var(--band-dim);
}

.section-head h2 {
  font-family: var(--font-jp);
  font-weight: 900;
  font-size: clamp(28px, 4.4vw, 48px);
  letter-spacing: 0.01em;
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
}

.head-en {
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.band .head-en {
  color: var(--band-dim);
}

/* ---------- business ---------- */

.biz-list {
  list-style: none;
  border-top: 1px solid var(--line);
  max-width: 900px;
}

.biz-row {
  display: grid;
  grid-template-columns: 60px minmax(200px, 320px) 1fr;
  gap: 20px;
  align-items: baseline;
  padding: clamp(26px, 4vh, 42px) 8px;
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: padding-left 0.4s var(--ease-out);
}

.biz-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--ink);
  transform: scaleY(0);
  transition: transform 0.4s var(--ease-out);
}

.biz-row:hover {
  padding-left: 24px;
}

.biz-row:hover::before {
  transform: scaleY(1);
}

.biz-idx {
  font-family: var(--font-latin);
  font-weight: 800;
  font-size: 15px;
  color: var(--ink-faint);
  transition: color 0.3s;
}

.biz-row:hover .biz-idx {
  color: var(--ink);
}

.biz-row h3 {
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
}

.biz-row p {
  color: var(--ink-dim);
  font-size: 14px;
}

@media (max-width: 760px) {
  .biz-row {
    grid-template-columns: 40px 1fr;
  }
  .biz-row p {
    grid-column: 2;
  }
}

/* ---------- product band (inverted) ---------- */

.band {
  background: var(--band-bg);
  color: var(--band-ink);
}

.band-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(84px, 14vh, 160px) var(--pad);
}

.product-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(36px, 6vw, 88px);
  align-items: center;
}

@media (max-width: 860px) {
  .product-grid {
    grid-template-columns: 1fr;
  }
}

.product-wordmark {
  display: block;
  width: min(100%, 440px);
  margin-bottom: 30px;
  color: var(--band-ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(58px, 7.8vw, 94px);
  font-weight: 800;
  letter-spacing: 0;
  line-height: 0.94;
}

.product-desc {
  color: var(--band-dim);
  max-width: 480px;
}

/* ---------- abstract tile lattice ---------- */

.product-visual {
  display: flex;
  justify-content: center;
}

.tile-abstract {
  width: min(100%, 420px);
  aspect-ratio: 1;
  overflow: hidden;
}

.tile-abstract line {
  stroke: var(--band-line);
  stroke-width: 1.5;
  fill: rgba(250, 250, 250, 0.025);
  stroke-linejoin: round;
  stroke-linecap: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 1s var(--ease-out);
  transition-delay: var(--ld);
}

.product-visual.in .tile-abstract line {
  stroke-dashoffset: 0;
}

/* ---------- contact ---------- */

.mail-giant {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 40px);
  border: 1.5px solid var(--ink);
  padding: clamp(30px, 6vh, 60px) clamp(22px, 4vw, 56px);
  position: relative;
  overflow: hidden;
}

.mail-giant::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--ink);
  transform: translateY(101%);
  transition: transform 0.5s var(--ease-out);
}

.mail-giant:hover::before {
  transform: translateY(0);
}

.mail-giant > * {
  position: relative;
  transition: color 0.4s;
}

.mail-addr {
  font-family: var(--font-latin);
  font-weight: 800;
  font-size: clamp(19px, 4.4vw, 54px);
  letter-spacing: -0.01em;
  word-break: break-all;
  flex: 1;
}

.mail-giant:hover > * {
  color: var(--bg);
}

/* ---------- profile ---------- */

.info-table {
  border-top: 1px solid var(--line);
  max-width: 760px;
}

.info-table > div {
  display: grid;
  grid-template-columns: minmax(120px, 220px) 1fr;
  gap: 16px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
}

.info-table dt {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  padding-top: 2px;
}

.info-table dd a {
  border-bottom: 1.5px solid var(--ink);
  transition: opacity 0.25s;
}

.info-table dd a:hover {
  opacity: 0.55;
}

/* ---------- footer ---------- */

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  padding: 30px var(--pad) 40px;
  border-top: 1px solid var(--line);
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.foot-nav {
  display: flex;
  gap: 26px;
}

.foot-nav a {
  transition: color 0.25s;
}

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

/* ---------- scroll reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .ticker-track,
  .scroll-bar::after {
    animation: none !important;
  }
  .reveal-load {
    animation: none;
    opacity: 1;
    transform: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .tile-abstract line {
    stroke-dashoffset: 0;
    transition: none;
  }
}