/* ============================================================
   koisen — shared styles (mystic / tarot / starlit dark theme)
   Plain CSS, no build step. Mobile-first, single stylesheet
   shared by hub, diagnosis pages, and about page.
   ============================================================ */

:root {
  /* palette */
  --ink-deep: #0e0b1a;
  --ink-panel: #171232;
  --ink-panel-raised: #1f1a3d;
  --gold: #e8c86a;
  --gold-dim: #b89a4f;
  --amethyst: #8b6fe0;
  --amethyst-dim: #5f4c96;
  --text: #ede9f5;
  --text-dim: #a89fc4;
  --line: rgba(232, 200, 106, 0.18);
  --line-strong: rgba(232, 200, 106, 0.4);
  --danger: #e08a8a;

  /* type */
  --font-serif: "Shippori Mincho", "Noto Serif JP", "Hiragino Mincho ProN", "Georgia", serif;
  --font-sans: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;

  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;

  --shadow-soft: 0 12px 40px rgba(0, 0, 0, 0.45);
  --content-max: 560px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink-deep);
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 120% 60% at 20% -10%, rgba(139, 111, 224, 0.16), transparent 60%),
    radial-gradient(ellipse 100% 50% at 90% 0%, rgba(232, 200, 106, 0.08), transparent 55%),
    var(--ink-deep);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* starfield background flourish */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(1.5px 1.5px at 10% 20%, rgba(237, 233, 245, 0.6), transparent),
    radial-gradient(1px 1px at 80% 10%, rgba(237, 233, 245, 0.5), transparent),
    radial-gradient(1.5px 1.5px at 60% 70%, rgba(232, 200, 106, 0.5), transparent),
    radial-gradient(1px 1px at 30% 85%, rgba(237, 233, 245, 0.4), transparent),
    radial-gradient(1px 1px at 92% 60%, rgba(237, 233, 245, 0.45), transparent),
    radial-gradient(1.5px 1.5px at 45% 35%, rgba(232, 200, 106, 0.35), transparent);
  background-size: 100% 100%;
}

a {
  color: var(--gold);
}

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
  color: var(--text);
}

.back-link {
  display: inline-block;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.back-link:hover {
  color: var(--gold);
}

/* ---- buttons ------------------------------------------------ */
.btn {
  display: inline-block;
  width: 100%;
  text-align: center;
  padding: 0.95rem 1.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: linear-gradient(135deg, var(--amethyst), var(--amethyst-dim));
  color: #fff;
  box-shadow: 0 8px 24px rgba(139, 111, 224, 0.35);
}

.btn--cta {
  background: linear-gradient(135deg, var(--gold), var(--gold-dim));
  color: #241c05;
  box-shadow: 0 8px 24px rgba(232, 200, 106, 0.3);
  margin-top: 0.75rem;
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line-strong);
  margin-top: 0.75rem;
}

.btn--ghost:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* ---- hub ------------------------------------------------------ */
.hub {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 3rem 1.25rem 2.5rem;
}

.hub__header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hub__eyebrow {
  font-size: 0.8rem;
  color: var(--gold);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.hub__brand {
  font-size: 2.1rem;
  color: var(--text);
}

.hub__desc {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.diag-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.diag-card {
  display: block;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--ink-panel-raised), var(--ink-panel));
  border: 1px solid var(--line);
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.diag-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, transparent 60%, rgba(232, 200, 106, 0.08));
  pointer-events: none;
}

.diag-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.diag-card__name {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.diag-card__tagline {
  display: block;
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.diag-card__cta {
  display: block;
  color: var(--gold);
  font-size: 0.85rem;
  font-weight: 600;
}

.empty {
  color: var(--text-dim);
  text-align: center;
}

/* ---- diagnosis flow -------------------------------------------- */
.diag {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.stage {
  animation: fade-in 0.4s ease both;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.diag__eyebrow {
  font-size: 0.8rem;
  color: var(--gold);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.diag__tagline {
  font-size: 1.6rem;
  line-height: 1.5;
}

.diag__lead {
  color: var(--text-dim);
  font-size: 0.92rem;
  margin-bottom: 2rem;
}

.disclosure {
  color: var(--text-dim);
  font-size: 0.75rem;
  margin-top: 1rem;
}

.progress {
  height: 3px;
  background: var(--line);
  border-radius: 2px;
  margin-bottom: 2rem;
  overflow: hidden;
}

.progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--amethyst), var(--gold));
  transition: width 0.35s ease;
}

.question__text {
  font-size: 1.3rem;
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

.question__options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.option-btn {
  text-align: left;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--ink-panel);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.98rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.option-btn:hover {
  border-color: var(--gold);
  background: var(--ink-panel-raised);
}

.option-btn:active {
  transform: scale(0.98);
}

/* ---- result ------------------------------------------------- */
.result__eyebrow {
  font-size: 0.8rem;
  color: var(--gold);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.result__name {
  font-size: 1.9rem;
  background: linear-gradient(135deg, var(--gold), var(--amethyst));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.result__cardline {
  color: var(--text-dim);
  font-style: italic;
  margin-bottom: 1.75rem;
}

.result__block {
  padding: 1.25rem;
  border-radius: var(--radius-md);
  background: var(--ink-panel);
  border: 1px solid var(--line);
  margin-bottom: 1rem;
}

.result__block h3 {
  font-size: 0.85rem;
  color: var(--gold);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.result__block p {
  font-size: 0.95rem;
  margin: 0;
  color: var(--text);
}

/* ---- share card -------------------------------------------- */
.share-card {
  margin: 2rem 0;
  text-align: center;
}

.share-card canvas {
  width: 100%;
  max-width: 340px;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--line-strong);
}

.share-card__actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.share-card__actions .btn {
  margin-top: 0;
}

.share-card__prompt {
  color: var(--text-dim);
  font-size: 0.8rem;
  margin-top: 0.75rem;
}

/* ---- funnel / CTA -------------------------------------------- */
.funnel {
  margin: 2rem 0 1rem;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--ink-panel-raised), var(--ink-panel));
  border: 1px solid var(--line);
}

.funnel__pr-label {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--ink-deep);
  background: var(--gold);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.85rem;
  font-weight: 700;
}

.funnel h3 {
  font-size: 1.1rem;
}

.funnel__note {
  color: var(--text-dim);
  font-size: 0.75rem;
  margin-top: 0.5rem;
  margin-bottom: 0;
}

/* ---- about page ------------------------------------------------ */
.about {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.about h2 {
  font-size: 1.1rem;
  margin-top: 2rem;
}

/* ---- footer ------------------------------------------------- */
.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  text-align: center;
}

.site-footer__nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.85rem;
}

.site-footer__nav a:hover {
  color: var(--gold);
}

.site-footer__copy {
  color: var(--text-dim);
  font-size: 0.75rem;
  margin-top: 0.75rem;
  margin-bottom: 0;
}

@media (min-width: 640px) {
  .hub__brand {
    font-size: 2.6rem;
  }
  .diag__tagline {
    font-size: 1.9rem;
  }
}