/* ---- 基調カラー: 墨・金・朱・和紙 ---- */
:root {
  --sumi: #1a1510;
  --kin: #c9a961;
  --kin-dark: #a68845;
  --shu: #8b2e2e;
  --shu-light: #b84545;
  --washi: #ebe0c4;
  --washi-dark: #d4c6a0;
  --washi-shadow: #8a7a54;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  min-height: 100%;
}

body {
  font-family: "Shippori Mincho B1", "Yu Mincho", "Hiragino Mincho ProN", serif;
  color: var(--sumi);
  background:
    radial-gradient(ellipse at center, #3a2a1a 0%, #1a0f08 100%);
  background-attachment: fixed;
  min-height: 100vh;
  position: relative;
  /* ページ全体を縦スクロール可に（html/bodyの既定スクロールを使う） */
  overflow-x: hidden;
}

.screen {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* ---- 和紙パネル ---- */
.paper {
  background: var(--washi);
  background-image:
    radial-gradient(circle at 20% 30%, rgba(138, 122, 84, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(138, 122, 84, 0.08) 0%, transparent 50%);
  border: 3px double var(--kin-dark);
  box-shadow:
    0 0 0 8px var(--sumi),
    0 0 0 10px var(--kin-dark),
    0 20px 60px rgba(0, 0, 0, 0.6);
  padding: 40px 30px;
  max-width: 480px;
  width: 100%;
  text-align: center;
  position: relative;
}

/* タイトル画面のpaperはOG画像を活かすため広め */
#title-screen .paper {
  max-width: 720px;
  padding: 24px 22px 32px;
}

/* ---- タイトル画面 ---- */
.title-frame {
  margin: 10px 0 16px;
}

.title-image {
  position: relative;
  margin: 0 0 24px;
  background: var(--sumi);
  padding: 4px;
  box-shadow:
    0 0 0 1px var(--kin-dark),
    0 10px 28px rgba(0, 0, 0, 0.6);
}

.title-image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--washi);
}

.title-vertical {
  display: inline-flex;
  flex-direction: column;
  font-family: "Yuji Syuku", "Shippori Mincho B1", serif;
  font-size: 64px;
  line-height: 1.1;
  color: var(--sumi);
  text-shadow:
    2px 2px 0 var(--kin),
    4px 4px 8px rgba(0, 0, 0, 0.3);
  font-weight: 800;
  letter-spacing: 0;
  padding: 10px 20px;
  border-top: 2px solid var(--sumi);
  border-bottom: 2px solid var(--sumi);
}

.title-vertical span {
  display: block;
  padding: 2px 0;
}

.series-label {
  font-family: "Yuji Syuku", "Shippori Mincho B1", serif;
  font-size: 18px;
  color: var(--shu);
  margin-bottom: 16px;
  letter-spacing: 0.4em;
  font-weight: 700;
}

/* ---- スタート画面に散らばる札 ---- */
.deco-cards {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.deco-card {
  position: absolute;
  writing-mode: vertical-rl;
  background:
    linear-gradient(180deg, var(--washi) 0%, var(--washi-dark) 100%);
  border: 1px solid var(--washi-shadow);
  padding: 14px 8px;
  font-size: 17px;
  color: var(--sumi);
  box-shadow:
    inset 0 0 0 1px var(--kin-dark),
    2px 4px 10px rgba(0, 0, 0, 0.45);
  font-family: "Yuji Syuku", serif;
  letter-spacing: 0.12em;
  line-height: 1.4;
  white-space: nowrap;
}

.deco-card:nth-child(1) { top:  5%;   left:  6%; }
.deco-card:nth-child(2) { top:  6%;   right: 7%; }
.deco-card:nth-child(3) { top:  40%;  left:  3%; }
.deco-card:nth-child(4) { top:  38%;  right: 4%; }
.deco-card:nth-child(5) { bottom: 6%; left:  8%; }
.deco-card:nth-child(6) { bottom: 7%; right: 6%; }

/* paper を札より前面に */
.paper { z-index: 1; }

.rule-hint {
  font-size: 13px;
  color: var(--sumi);
  opacity: 0.75;
  margin-top: 20px;
  line-height: 1.8;
}

.copyright {
  font-size: 11px;
  color: var(--washi-shadow);
  margin-top: 20px;
  letter-spacing: 0.15em;
}

/* ---- 札風ボタン ---- */
.fuda-button {
  font-family: "Yuji Syuku", "Shippori Mincho B1", serif;
  font-size: 22px;
  color: var(--washi);
  background: linear-gradient(180deg, var(--sumi) 0%, #2a1f14 100%);
  border: 2px solid var(--kin);
  padding: 14px 36px;
  cursor: pointer;
  letter-spacing: 0.3em;
  box-shadow:
    inset 0 0 0 1px var(--kin-dark),
    0 4px 10px rgba(0, 0, 0, 0.4);
  transition: transform 0.1s, box-shadow 0.1s;
  margin: 10px 0;
}

.fuda-button:hover {
  transform: translateY(-2px);
  box-shadow:
    inset 0 0 0 1px var(--kin),
    0 6px 14px rgba(0, 0, 0, 0.5);
}

.fuda-button:active {
  transform: translateY(1px);
}

.fuda-button.small {
  font-size: 16px;
  padding: 10px 24px;
}

/* ---- 難易度選択ボタン ---- */
.difficulty-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  margin: 14px 0 6px;
}

.difficulty-button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 240px;
  padding: 12px 24px;
  margin: 0;
}

.difficulty-button .difficulty-range {
  font-family: "Shippori Mincho B1", "Yu Mincho", serif;
  font-size: 12px;
  color: var(--kin);
  letter-spacing: 0.2em;
  opacity: 0.85;
}

/* ---- 問題画面 ---- */
#quiz-screen {
  flex-direction: column;
  padding: 16px;
  align-items: stretch;
  /* 縦スクロール可。内容が高くても上端から流し、中央寄せで上端が切れないように */
  justify-content: flex-start;
  min-height: auto;
}

#hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: var(--kin);
  font-size: 14px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--kin-dark);
  margin-bottom: 16px;
  letter-spacing: 0.1em;
}

#hud .hud-item:first-child {
  color: var(--shu-light);
  font-family: "Yuji Syuku", "Shippori Mincho B1", serif;
}

#hud #q-difficulty {
  color: var(--shu-light);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.15em;
  /* 難易度ごとに視認しやすい和の色 */
}

/* 初級: 若草色（やわらかな緑） */
#hud #q-difficulty.diff-beginner     { color: #9ec96a; }
/* 中級: 浅葱色（澄んだ青） */
#hud #q-difficulty.diff-intermediate { color: #6cc1d6; }
/* 上級: 緋（ひ）色（鮮やかな朱赤） */
#hud #q-difficulty.diff-advanced     { color: #e26464; }

.hud-item strong,
.hud-item span {
  color: var(--washi);
  font-size: 18px;
  font-weight: 700;
  margin: 0 2px;
}

/* ---- 上の句の大きな札 ---- */
.kami-fuda {
  background: var(--washi);
  background-image:
    linear-gradient(180deg, var(--washi) 0%, var(--washi-dark) 100%);
  border: 2px solid var(--sumi);
  box-shadow:
    inset 0 0 0 1px var(--kin),
    inset 0 0 20px rgba(138, 122, 84, 0.2),
    0 10px 30px rgba(0, 0, 0, 0.5);
  padding: 18px 16px;
  margin: 0 auto 16px;
  max-width: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.kami-fuda::before,
.kami-fuda::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid var(--washi-shadow);
  pointer-events: none;
}

.fuda-inner {
  display: flex;
  flex-direction: row-reverse; /* 右の列から読む（縦書きの伝統順） */
  justify-content: center;
  align-items: flex-start;
  gap: 10px;
  font-family: "Yuji Syuku", "Shippori Mincho B1", serif;
  font-size: 24px;
  color: var(--sumi);
  letter-spacing: 0.08em;
  width: 100%;
}

.kami-col {
  writing-mode: vertical-rl;
  line-height: 1.5;
  white-space: nowrap;
}

.instruction {
  text-align: center;
  color: var(--kin);
  font-size: 15px;
  letter-spacing: 0.4em;
  margin: 8px 0 14px;
}

/* ---- 下の句 5択 ---- */
.choices {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  max-width: 700px;
  margin: 0 auto;
}

.choice-fuda {
  writing-mode: vertical-rl;
  background: var(--washi);
  background-image: linear-gradient(180deg, var(--washi) 0%, var(--washi-dark) 100%);
  border: 2px solid var(--sumi);
  box-shadow:
    inset 0 0 0 1px var(--kin-dark),
    0 4px 8px rgba(0, 0, 0, 0.4);
  padding: 18px 6px;
  font-family: "Yuji Syuku", "Shippori Mincho B1", serif;
  font-size: 20px;
  line-height: 1.45;
  color: var(--sumi);
  cursor: pointer;
  min-height: 260px;
  display: flex;
  justify-content: center;
  transition: transform 0.1s, box-shadow 0.1s;
  text-align: start;
  letter-spacing: 0.04em;
  word-break: keep-all;
}

.choice-fuda:hover:not(:disabled) {
  transform: translateY(-4px);
  box-shadow:
    inset 0 0 0 1px var(--kin),
    0 8px 14px rgba(0, 0, 0, 0.5);
}

.choice-fuda:disabled {
  cursor: default;
}

.choice-fuda.correct {
  background: linear-gradient(180deg, #f5e9a8 0%, #e0c660 100%);
  border-color: var(--kin-dark);
  animation: pulse-correct 0.6s ease;
}

.choice-fuda.wrong {
  background: linear-gradient(180deg, #e8b8b8 0%, #c07878 100%);
  border-color: var(--shu);
  opacity: 0.85;
}

@keyframes pulse-correct {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* ---- フィードバック ---- */
.feedback {
  background: var(--washi);
  border: 2px solid var(--sumi);
  box-shadow:
    inset 0 0 0 1px var(--kin),
    0 10px 24px rgba(0, 0, 0, 0.5);
  padding: 18px 16px;
  margin: 20px auto 20px;
  max-width: 700px;
  width: 100%;
  text-align: center;
  box-sizing: border-box;
  overflow-wrap: anywhere;
}

#feedback-result {
  font-size: 26px;
  font-family: "Yuji Syuku", serif;
  margin-bottom: 10px;
  letter-spacing: 0.2em;
}

#feedback-result.ok { color: var(--kin-dark); }
#feedback-result.ng { color: var(--shu); }

#feedback-detail {
  font-size: 15px;
  line-height: 1.8;
  color: var(--sumi);
  margin-bottom: 14px;
  text-align: left;
  word-break: break-word;
  overflow-wrap: anywhere;
}

#feedback-detail .author {
  color: var(--shu);
  font-weight: 700;
  margin-right: 8px;
}

/* ---- 歌絵（金屏風） ---- */
#feedback-detail .poem-image {
  margin: 4px 0 14px;
  background: var(--sumi);
  padding: 4px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
}

#feedback-detail .poem-image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--washi);
}

#feedback-detail .full-poem {
  display: flex;
  flex-direction: row-reverse;  /* 右の句から読む */
  justify-content: center;
  align-items: flex-start;
  gap: 10px;
  background: var(--washi-dark);
  padding: 18px 12px;
  margin: 10px 0;
  border-left: 3px solid var(--kin-dark);
  border-right: 3px solid var(--kin-dark);
}

#feedback-detail .phrase-col {
  display: flex;
  flex-direction: row; /* orig を左（本文）、yomi を右（ふりがな） */
  align-items: flex-start;
  gap: 2px;
  min-width: 0;
}

#feedback-detail .phrase-orig {
  writing-mode: vertical-rl;
  font-family: "Yuji Syuku", "Shippori Mincho B1", serif;
  font-size: 19px;
  line-height: 1.45;
  color: var(--sumi);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

#feedback-detail .phrase-yomi {
  writing-mode: vertical-rl;
  font-family: "Shippori Mincho B1", "Yu Mincho", serif;
  font-size: 13px;
  line-height: 1.3;
  color: var(--washi-shadow);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

#feedback-detail .poem-sep {
  align-self: stretch;
  width: 1px;
  margin: 0 6px;
  background: var(--washi-shadow);
  opacity: 0.5;
}

#feedback-detail .author-line {
  text-align: center;
  margin-top: 10px;
  font-size: 14px;
}

#feedback-detail .author-yomi {
  color: var(--washi-shadow);
  font-family: "Shippori Mincho B1", "Yu Mincho", serif;
  font-size: 11px;
  font-weight: normal;
  letter-spacing: 0.1em;
  margin-left: 2px;
}

#feedback-detail .poem-meaning {
  margin-top: 12px;
  padding: 12px 14px;
  background: var(--washi-dark);
  border-left: 3px solid var(--shu);
  font-family: "Shippori Mincho B1", "Yu Mincho", serif;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sumi);
  text-align: left;
  letter-spacing: 0.03em;
}

/* ---- 結果画面 ---- */
.result-title {
  font-family: "Yuji Syuku", serif;
  font-size: 36px;
  letter-spacing: 0.4em;
  color: var(--sumi);
  margin-bottom: 20px;
  border-top: 2px solid var(--sumi);
  border-bottom: 2px solid var(--sumi);
  padding: 8px 0;
}

.result-score {
  font-size: 40px;
  color: var(--shu);
  font-family: "Yuji Syuku", serif;
  margin: 20px 0 8px;
}

.result-time {
  font-size: 18px;
  color: var(--sumi);
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  font-family: "Yuji Syuku", serif;
}

.result-time span {
  color: var(--shu);
  font-size: 22px;
  margin-left: 6px;
}

.result-rank {
  font-size: 18px;
  color: var(--sumi);
  margin-bottom: 20px;
  letter-spacing: 0.1em;
}

.result-buttons {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 10px;
  justify-content: center;
  align-items: center;
  margin: 10px 0 6px;
}

.result-buttons .fuda-button {
  margin: 0;
  padding: 12px 20px;
  font-size: 18px;
  letter-spacing: 0.2em;
  white-space: nowrap;
}

.home-link,
.gallery-link {
  display: inline-block;
  margin-top: 16px;
  color: var(--washi-shadow);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid var(--washi-shadow);
  padding-bottom: 2px;
  letter-spacing: 0.2em;
  font-family: "Yuji Syuku", "Shippori Mincho B1", serif;
}

.gallery-link {
  color: var(--shu);
  border-bottom-color: var(--shu);
  font-size: 14px;
  margin-top: 18px;
}

.gallery-link:hover {
  color: var(--shu-light);
  border-bottom-color: var(--shu-light);
}

/* ---- スマホ対応 ---- */
@media (max-width: 600px) {
  .title-vertical { font-size: 48px; }
  #title-screen .paper { max-width: 100%; padding: 18px 14px 24px; }
  .deco-card { font-size: 14px; padding: 10px 6px; letter-spacing: 0.08em; }
  .fuda-inner { font-size: 20px; gap: 6px; }
  .choices { grid-template-columns: repeat(5, 1fr); gap: 4px; }
  .choice-fuda {
    font-size: 16px;
    padding: 14px 3px;
    min-height: 230px;
    letter-spacing: 0.02em;
  }
  .paper { padding: 30px 20px; }
  .result-title { font-size: 28px; }
  .result-score { font-size: 32px; }
  #feedback-detail { font-size: 14px; }
  #feedback-detail .phrase-orig { font-size: 16px; }
  #feedback-detail .phrase-yomi { font-size: 11px; }
  #feedback-detail .full-poem { gap: 4px; padding: 14px 6px; }
  #feedback-detail .poem-sep { margin: 0 2px; }
  #feedback-detail .poem-meaning { font-size: 13px; padding: 10px 12px; }
}

/* ---- スマホ標準 (iPhone SE / 360〜390px) ---- */
@media (max-width: 400px) {
  /* 画面端いっぱいまで使う（左右パディングほぼゼロ） */
  .screen { padding: 6px 0; }
  #quiz-screen { padding: 6px 0; }
  #hud { padding: 6px 10px; margin-bottom: 10px; }

  /* 上の句の札は幅を絞って縦書きにコンパクトに */
  .kami-fuda {
    padding: 12px 8px;
    margin: 0 auto 12px;
    max-width: 260px;
    width: auto;
  }
  .fuda-inner { font-size: 18px; gap: 4px; }

  /* 下の短冊を大きく（より縦長・文字大きく） */
  .choices { gap: 2px; max-width: none; padding: 0; }
  .choice-fuda {
    font-size: 20px;
    padding: 22px 2px;
    min-height: 360px;
    line-height: 1.6;
    letter-spacing: 0;
    border-width: 1px;
  }

  .instruction { font-size: 13px; letter-spacing: 0.3em; margin: 4px 0 10px; }
  .feedback { padding: 14px 10px; margin: 14px 4px; }
}

/* ---- 極小端末 (<=340px) ---- */
@media (max-width: 340px) {
  .kami-fuda { max-width: 240px; }
  .choice-fuda { font-size: 17px; min-height: 320px; padding: 18px 1px; }
  .fuda-inner { font-size: 16px; }
}