/* ajisaiflow.net — shared styles */
:root {
  /* Ajisai palette — hydrangea petals */
  --ink:        #1a1d2e;            /* deep ink */
  --ink-2:      #2d3149;
  --ink-3:      #5a5f7d;
  --ink-4:      #8a8fad;
  --paper:      #f7f4ee;            /* warm off-white (kinari) */
  --paper-2:    #efeae1;
  --paper-3:    #e5dfd3;

  --ajisai-1:   #a8c5e8;            /* pale blue */
  --ajisai-2:   #7b98d4;            /* soft indigo */
  --ajisai-3:   #5769b8;            /* iris */
  --ajisai-4:   #6d4c9c;            /* deep violet */
  --ajisai-5:   #c2a4d1;            /* light mauve */
  --ajisai-6:   #d88bb0;            /* pink-purple */
  --leaf:       #4a6b4e;            /* hydrangea leaf green */
  --leaf-light: #8fa685;

  --accent:     var(--ajisai-3);
  --accent-2:   var(--ajisai-4);

  --rule:       rgba(26, 29, 46, 0.12);
  --rule-2:     rgba(26, 29, 46, 0.06);

  --mincho: "Noto Serif JP", "Hiragino Mincho ProN", "游明朝", "Yu Mincho", serif;
  --gothic: "Noto Sans JP", "Hiragino Sans", "游ゴシック", "Yu Gothic", sans-serif;
  --mono:   "JetBrains Mono", "SF Mono", ui-monospace, monospace;

  --container: 1240px;
  --gutter: clamp(20px, 4vw, 48px);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--gothic);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 15px;
  letter-spacing: 0.02em;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

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

/* ---------- Typography ---------- */
.kanji-title {
  font-family: var(--mincho);
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.3;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ajisai-3);
}
.vert {
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-header .container {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mincho);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: 0.1em;
}
.brand .mark { width: 28px; height: 28px; flex: none; }
.brand-sub {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-4);
  letter-spacing: 0.2em;
  margin-left: 4px;
  border-left: 1px solid var(--rule);
  padding-left: 10px;
}
.nav {
  margin-left: auto;
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav a {
  padding: 8px 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  border-radius: 2px;
  position: relative;
  transition: color .2s;
  white-space: nowrap;
}
.nav a:hover { color: var(--ajisai-4); }
.nav a.active { color: var(--ajisai-4); }
.nav a.active::after {
  content: "";
  position: absolute;
  bottom: 2px; left: 50%;
  width: 14px; height: 1px;
  background: var(--ajisai-4);
  transform: translateX(-50%);
}
.nav-cta {
  margin-left: 8px;
  padding: 8px 14px !important;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper) !important;
  font-size: 12px !important;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--ajisai-4); border-color: var(--ajisai-4); color: var(--paper) !important; }

/* mobile nav */
.nav-toggle { display: none; }
@media (max-width: 1080px) {
  .nav { display: none; }
  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
    width: 40px; height: 40px;
    border: 1px solid var(--rule);
    background: transparent;
    align-items: center;
    justify-content: center;
  }
  .nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
    display: block; width: 18px; height: 1px; background: var(--ink);
    position: relative; content: "";
  }
  .nav-toggle span::before { position: absolute; top: -6px; }
  .nav-toggle span::after  { position: absolute; top: 6px; }
  .nav.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: 72px; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--rule);
    padding: 12px var(--gutter); gap: 0;
  }
  .nav.open a { padding: 14px 0; border-bottom: 1px solid var(--rule-2); }
  .nav.open .nav-cta { margin: 12px 0 4px; text-align: center; }
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 120px;
  border-top: 1px solid var(--rule);
  background: var(--paper-2);
  padding: 64px 0 40px;
  font-size: 13px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 48px;
}
.footer-grid h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 16px;
  font-weight: 500;
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a { color: var(--ink-2); border-bottom: 1px solid transparent; }
.footer-grid a:hover { color: var(--ajisai-4); border-bottom-color: var(--ajisai-4); }
.footer-bottom {
  margin-top: 56px; padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; gap: 16px;
  flex-wrap: wrap;
  color: var(--ink-4);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

/* ---------- Section primitives ---------- */
.section { padding: 96px 0; position: relative; }
.section-header {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.section-header .num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ajisai-3);
  letter-spacing: 0.2em;
}
.section-header h2 {
  font-family: var(--mincho);
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 40px);
  margin: 0;
  letter-spacing: 0.06em;
}
.section-header .sub {
  color: var(--ink-3);
  font-size: 13px;
  margin-left: auto;
  font-family: var(--mono);
  letter-spacing: 0.1em;
}
.section-header .rule {
  flex: 1 1 60px;
  height: 1px;
  background: var(--rule);
  align-self: center;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  font-size: 13px;
  letter-spacing: 0.12em;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  transition: all .2s;
}
.btn:hover { background: var(--ajisai-4); border-color: var(--ajisai-4); }
.btn-ghost {
  background: transparent; color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn svg { width: 14px; height: 14px; }

/* ---------- Card ---------- */
.card {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 24px;
  transition: all .25s;
  position: relative;
}
.card:hover {
  border-color: var(--ajisai-3);
  transform: translateY(-2px);
  box-shadow: 0 20px 40px -30px rgba(87, 105, 184, 0.4);
}

/* ---------- Ajisai motif ---------- */
.petal-pattern {
  position: absolute;
  pointer-events: none;
  opacity: 0.5;
}

/* ---------- Utilities ---------- */
.divider {
  height: 1px;
  background: var(--rule);
  margin: 80px 0;
}
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ajisai-4);
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  font-size: 13px;
  letter-spacing: 0.08em;
  transition: gap .2s;
}
.link-arrow:hover { gap: 12px; }

.tag {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: 1px solid var(--rule);
  color: var(--ink-3);
  background: var(--paper);
}
.tag.accent { color: var(--ajisai-4); border-color: var(--ajisai-5); background: color-mix(in oklab, var(--ajisai-5) 15%, var(--paper)); }
.tag.leaf { color: var(--leaf); border-color: color-mix(in oklab, var(--leaf) 40%, transparent); background: color-mix(in oklab, var(--leaf) 10%, var(--paper)); }

/* ---------- Breadcrumb / page header ---------- */
.page-head {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(60% 80% at 85% 0%, color-mix(in oklab, var(--ajisai-1) 35%, transparent), transparent 60%),
    var(--paper);
  position: relative;
  overflow: hidden;
}
.page-head .crumb {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-4);
  text-transform: uppercase;
}
.page-head h1 {
  font-family: var(--mincho);
  font-weight: 500;
  font-size: clamp(36px, 5vw, 56px);
  margin: 16px 0 12px;
  letter-spacing: 0.06em;
}
.page-head p { color: var(--ink-3); max-width: 720px; margin: 0; font-size: 15px; }
.page-head .petal-pattern { right: -60px; top: -40px; width: 300px; }

/* ---------- Misc ---------- */
.placeholder-img {
  background:
    repeating-linear-gradient(
      135deg,
      color-mix(in oklab, var(--ajisai-1) 40%, var(--paper-2)) 0 8px,
      var(--paper-2) 8px 16px);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-4);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  border: 1px solid var(--rule);
}
.grid { display: grid; gap: 24px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
}

/* smooth fade up */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 0; }
.reveal.in { animation: fadeUp .8s cubic-bezier(.2,.7,.2,1) forwards; }