:root {
  --ink: #10162b;
  --ink-2: #1a2140;
  --amber: #e9b866;
  --amber-deep: #7a4f1a;
  --cream: #f4e8d0;
  --cream-dim: #d9cdb6;
  --paper: #efe3c8;
  --paper-ink: #262033;
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--ink);
  background-image:
    radial-gradient(60rem 40rem at 12% -6rem, rgba(233, 163, 74, 0.26), transparent 70%),
    radial-gradient(50rem 40rem at 100% 40%, rgba(60, 76, 130, 0.25), transparent 70%);
  background-repeat: no-repeat;
  color: var(--cream);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.9;
}

.wrap {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 0 16px;
}

a { color: var(--amber); text-underline-offset: 3px; }

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

rt {
  font-size: 0.42em;
  letter-spacing: 0.08em;
  color: inherit;
}

/* 先頭 */
.hero {
  display: grid;
  gap: 24px;
  padding: 40px 0 16px;
}

.site-name {
  margin: 0;
  color: var(--amber);
  font-size: 15px;
  letter-spacing: 0.18em;
}

h1 {
  margin: 4px 0 8px;
  font-size: clamp(38px, 11vw, 60px);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0.04em;
}

.lead { margin: 0; color: var(--cream-dim); }

.portrait-frame {
  display: flex;
  align-items: center;
  gap: 16px;
}

.portrait-frame img {
  width: 104px;
  height: 104px;
  flex: none;
  border: 2px solid var(--amber);
  border-radius: 50%;
  object-fit: cover;
}

.portrait-note { margin: 0; font-size: 15px; line-height: 1.75; }

.portrait-note .guide-label { display: block; color: var(--amber); font-size: 13px; }

.portrait-note .guide-name { display: block; font-weight: 600; }

/* フォーム */
.form-card {
  padding: 22px 18px;
  border: 1px solid rgba(233, 184, 102, 0.42);
  background: var(--ink-2);
}

fieldset { margin: 0; padding: 0; border: 0; }

legend { padding: 0; font-weight: 600; }

.date-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0 8px;
}

.date-fields label { display: block; font-size: 15px; }

.date-fields input {
  width: 100%;
  min-height: 52px;
  margin-top: 6px;
  padding: 8px 12px;
  border: 1px solid var(--cream-dim);
  border-radius: 4px;
  background: var(--paper);
  color: var(--paper-ink);
  font-family: inherit;
  font-size: 22px;
  text-align: center;
}

.date-fields input[aria-invalid="true"] {
  border-color: #ffb3a7;
  box-shadow: 0 0 0 2px #ffb3a7;
}

.form-error {
  min-height: 1.7em;
  margin: 0 0 8px;
  color: #ffc9c0;
  font-size: 15px;
}

.btn {
  display: inline-block;
  min-height: 52px;
  padding: 11px 26px;
  border: 1px solid var(--amber);
  border-radius: 4px;
  background: var(--amber);
  color: var(--ink);
  font-family: inherit;
  font-size: 17px;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover { background: #f2c982; }

.btn:disabled { opacity: 0.6; cursor: progress; }

.btn-ghost {
  background: transparent;
  color: var(--amber);
}

.btn-ghost:hover { background: rgba(233, 184, 102, 0.14); }

.form-card .btn { width: 100%; }

.privacy { margin: 12px 0 0; color: var(--cream-dim); font-size: 14px; line-height: 1.7; }

/* 結果 */
.result { padding: 28px 0 8px; }

.result .tree-card { animation: rise 0.35s ease-out; }

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.tree-head { text-align: center; }

.eyebrow { margin: 0; color: var(--amber); font-size: 15px; }

.tree-name {
  margin: 24px 0 4px;
  font-size: clamp(46px, 14vw, 72px);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.06em;
}

.tree-name:focus { outline: none; }

.tree-range { margin: 0; color: var(--cream-dim); font-size: 15px; }

.tree-plate { margin: 20px 0; }

.tree-plate img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(233, 184, 102, 0.42);
}

.tree-plate img[hidden] { display: none; }

.plate-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 104px;
  padding: 16px;
  border: 1px solid var(--amber-deep);
  outline: 1px solid rgba(233, 184, 102, 0.5);
  outline-offset: -8px;
  background: var(--paper);
  color: var(--amber-deep);
  font-size: 26px;
  letter-spacing: 0.3em;
}

.plate-fallback[hidden] { display: none; }

.guide {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin: 20px 0;
}

.guide-portrait {
  width: 76px;
  height: 76px;
  flex: none;
  border: 2px solid var(--amber);
  border-radius: 50%;
  object-fit: cover;
}

.guide-body { min-width: 0; }

.guide-label { margin: 0; color: var(--amber); font-size: 13px; line-height: 1.5; }

.guide-name { margin: 0 0 4px; font-weight: 600; }

.guide-words { margin: 0; }

.paper {
  padding: 8px 20px 18px;
  background: var(--paper);
  color: var(--paper-ink);
}

.paper h3 {
  margin: 16px 0 2px;
  color: var(--amber-deep);
  font-size: 15px;
  letter-spacing: 0.08em;
}

.paper p { margin: 0; }

.save-row { margin-top: 18px; text-align: center; }

.save-status { min-height: 1.7em; margin: 8px 0 0; color: var(--cream-dim); font-size: 14px; }

/* 案内 */
.cta {
  margin: 28px 0;
  padding: 22px 18px;
  border: 1px solid rgba(233, 184, 102, 0.42);
  background: var(--ink-2);
  text-align: center;
}

.cta h2 { margin: 0 0 8px; font-size: 21px; font-weight: 600; }

.cta p { margin: 0 0 14px; }

.cta .btn { min-width: 240px; }

.cta [hidden] { display: none; }

.cta .pending { margin-bottom: 0; color: var(--cream-dim); font-size: 15px; }

/* 説明・一覧 */
.section { padding: 20px 0; }

.section h2 { margin: 0 0 10px; font-size: 22px; font-weight: 600; }

.section p { margin: 0 0 12px; }

.tree-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tree-list a {
  display: block;
  padding: 10px 12px;
  border: 1px solid rgba(233, 184, 102, 0.3);
  color: var(--cream);
  text-decoration: none;
  line-height: 1.5;
}

.tree-list a:hover { border-color: var(--amber); }

.tree-list b { display: block; font-size: 19px; font-weight: 600; }

.tree-list span { font-size: 13px; color: var(--cream-dim); }

.tree-list span.small { font-size: inherit; }

.back-link { margin: 24px 0 0; font-size: 15px; }

footer {
  margin-top: 16px;
  padding: 22px 0 36px;
  border-top: 1px solid rgba(233, 184, 102, 0.25);
  color: var(--cream-dim);
  font-size: 14px;
  line-height: 1.75;
}

footer p { margin: 0 0 6px; }

@media (min-width: 840px) {
  .hero {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding-top: 64px;
  }

  .hero .portrait-frame img { width: 132px; height: 132px; }

  .tree-list { grid-template-columns: repeat(4, minmax(0, 1fr)); }

  .tree-card { max-width: 680px; margin: 0 auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}