/* ==========================================================================
   Base styles — built entirely on tokens.css.
   No hardcoded colors/sizes: always reference var(--token).
   ========================================================================== */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--color-bg);
  /* 紙魚(しみ)・和紙のかすかな地紋。純色ベタを避け「少し不穏」な深みを出す。 */
  background-image:
    radial-gradient(ellipse at 15% -10%, rgba(183, 51, 26, 0.10), transparent 55%),
    radial-gradient(ellipse at 100% 0%, rgba(176, 141, 77, 0.06), transparent 45%);
  background-attachment: fixed;
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* --- Typography ---------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-text-strong);
  line-height: var(--lh-tight);
  font-weight: 600;
  margin: 0 0 var(--space-4);
}
h1 { font-size: var(--fs-3xl); letter-spacing: var(--tracking-wide); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }

p { margin: 0 0 var(--space-4); max-width: var(--measure); }

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
a:hover { color: var(--color-accent-hover); text-decoration: underline; }

small { font-size: var(--fs-sm); color: var(--color-text-faint); }
strong { color: var(--color-text-strong); }

/* Overline / kicker — 縦の細い和ラベル */
.kicker {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: var(--space-3);
}

/* --- Layout -------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.container--narrow { max-width: var(--container-narrow); }
.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-4); }

.section { padding-block: var(--space-8); }
.stack   { display: flex; flex-direction: column; gap: var(--space-4); }
.center  { text-align: center; }

/* Vermilion hairline divider with a 家紋-like center dot */
.rule-mon {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  position: relative;
  margin-block: var(--space-7);
}
.rule-mon::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 7px; height: 7px;
  transform: translate(-50%, -50%) rotate(45deg);
  background: var(--color-accent);
}

/* --- Header / footer ----------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: var(--border-hairline);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
}
.brand {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  color: var(--color-text-strong);
  letter-spacing: var(--tracking-wide);
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
}
.brand__mark { color: var(--color-accent); }
.nav { display: flex; gap: var(--space-5); font-family: var(--font-sans); font-size: var(--fs-sm); }
/* vertical padding gives the small nav links a ≥44px-ish tap target */
.nav a { color: var(--color-text-muted); padding-block: var(--space-2); }
.nav a:hover { color: var(--color-text-strong); text-decoration: none; }

.site-footer {
  border-top: var(--border-hairline);
  padding-block: var(--space-7);
  color: var(--color-text-faint);
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
}
.disclaimer {
  color: var(--color-text-faint);
  font-size: var(--fs-xs);
  line-height: var(--lh-snug);
  max-width: var(--measure);
}

/* --- Buttons ------------------------------------------------------------- */
.btn {
  --_bg: var(--color-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  color: var(--c-washi-100);
  background: var(--_bg);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-6);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.btn:hover { --_bg: var(--color-accent-hover); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--ghost {
  --_bg: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover { --_bg: var(--color-bg-raised); }

/* --- Cards --------------------------------------------------------------- */
.card {
  background: var(--color-bg-elevated);
  border: var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

/* --- Forms --------------------------------------------------------------- */
label { font-family: var(--font-sans); font-size: var(--fs-sm); color: var(--color-text-muted); }
input, select {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  color: var(--color-text-strong);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-3);
}
input:focus, select:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

/* --- Five-element chips (used by the reading result) --------------------- */
.el { display: inline-flex; align-items: center; gap: var(--space-2); font-family: var(--font-sans); font-size: var(--fs-sm); }
.el::before { content: ""; width: 0.7em; height: 0.7em; border-radius: 50%; background: var(--_el, var(--color-text-faint)); }
.el--wood  { --_el: var(--c-element-wood); }
.el--fire  { --_el: var(--c-element-fire); }
.el--earth { --_el: var(--c-element-earth); }
.el--metal { --_el: var(--c-element-metal); }
.el--water { --_el: var(--c-element-water); }

/* --- Accessibility ------------------------------------------------------- */
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
/* Small phones: keep the sticky header on one comfortable line and tighten
   gutters so nothing overflows the viewport (no horizontal scroll). */
@media (max-width: 26rem) {
  .container { padding-inline: var(--space-4); }
  .brand { font-size: var(--fs-base); }
  .nav { gap: var(--space-3); font-size: var(--fs-xs); }
  h1 { font-size: var(--fs-2xl); }
}

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