/* ============ 苔テラリウム検定 スタイル（スマホ最優先） ============ */
:root {
  --bg-top: #eef3ea;
  --bg-bottom: #dfe8d9;
  --card: #ffffff;
  --ink: #2b3a2c;
  --ink-soft: #5a6b58;
  --moss: #4f7a53;
  --moss-dark: #3f5d43;
  --moss-deep: #33482f;
  --moss-tint: #eaf1e6;
  --correct: #3f8f4e;
  --correct-bg: #e7f4e8;
  --wrong: #c15a3d;
  --wrong-bg: #fbeae4;
  --line: #d8e0d3;
  --radius: 16px;
  --shadow: 0 4px 16px rgba(51, 72, 47, 0.10);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP",
    "Yu Gothic", Meiryo, system-ui, sans-serif;
  color: var(--ink);
  background: linear-gradient(170deg, var(--bg-top), var(--bg-bottom)) no-repeat;
  background-size: cover;
  -webkit-text-size-adjust: 100%;
  line-height: 1.65;
}

.app {
  max-width: 560px;
  margin: 0 auto;
  padding: 20px 16px calc(28px + env(safe-area-inset-bottom));
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.screen { animation: fade 0.25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---- カード ---- */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 20px;
}

/* ---- スタート画面 ---- */
.start-card, .result-card { text-align: center; }
.leaf-mark { font-size: 46px; line-height: 1; margin-bottom: 6px; }
.title {
  font-size: 27px;
  letter-spacing: 0.04em;
  color: var(--moss-deep);
  margin: 4px 0 10px;
}
.subtitle { font-size: 16px; color: var(--moss-dark); font-weight: 600; margin: 0 0 22px; }
.lead { font-size: 14.5px; color: var(--ink-soft); margin: 0 0 24px; }

/* ---- モード選択 ---- */
.mode-block { text-align: center; padding: 18px 0 4px; border-top: 1px solid var(--line); margin-top: 6px; }
.mode-block:first-of-type { border-top: none; margin-top: 0; }
.mode-heading { font-size: 17px; color: var(--moss-deep); margin: 0 0 4px; }
.mode-desc { font-size: 13.5px; color: var(--ink-soft); margin: 0 0 14px; line-height: 1.6; }
.difficulty-buttons { display: flex; flex-direction: column; gap: 10px; }
.hint-note { font-size: 12px; color: var(--ink-soft); background: var(--moss-tint); border-radius: 10px; padding: 10px 12px; margin: 12px 0 0; line-height: 1.6; text-align: left; }
.challenge-block { background: linear-gradient(180deg, #fff7ec, #fdefda); border-radius: 14px; border-top: none; padding: 18px 16px 16px; margin-top: 16px; }

/* ---- 追加ボタン種別 ---- */
.btn-course { background: #eef3ea; color: var(--moss-deep); border: 2px solid var(--line); box-shadow: none; }
.btn-course:hover { background: #e4ecdf; border-color: #b9cbb4; }
.btn-course-all { background: var(--moss); color: #fff; border-color: var(--moss); }
.btn-course-all:hover { background: var(--moss-dark); }
.btn-challenge { background: linear-gradient(180deg, #e2a24d 0%, #d18234 100%); color: #fff; box-shadow: 0 3px 8px rgba(180, 110, 40, 0.3); }
.btn-challenge:hover { background: #c67a2f; }
.btn-share { background: #4a6da8; color: #fff; box-shadow: 0 3px 8px rgba(60, 90, 150, 0.28); }
.btn-share:hover { background: #3e5c90; }
.btn-outline { background: #fff; color: var(--moss-dark); border: 2px solid var(--moss); box-shadow: none; display: inline-block; text-align: center; text-decoration: none; line-height: 1.4; }
.btn-outline:hover { background: var(--moss-tint); }

/* ---- 戻るリンク ---- */
.back-link { background: none; border: none; color: var(--moss-dark); font-family: inherit; font-size: 14px; font-weight: 600; cursor: pointer; padding: 4px 0; margin-bottom: 8px; -webkit-tap-highlight-color: transparent; }
.back-link:hover { color: var(--moss); }

/* ---- ボタン共通 ---- */
.btn {
  font-family: inherit;
  font-size: 17px;
  font-weight: 600;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  width: 100%;
  padding: 15px 18px;
  transition: transform 0.06s ease, background 0.15s ease, box-shadow 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(0.98); }
.btn-lg { min-height: 56px; }
.btn-primary { background: var(--moss); color: #fff; box-shadow: 0 3px 8px rgba(63, 93, 67, 0.28); }
.btn-primary:hover { background: var(--moss-dark); }
.btn-primary:disabled { background: #b7c3b2; box-shadow: none; cursor: default; }

.error-text { color: var(--wrong); font-size: 14px; margin-top: 14px; }

/* ---- 出題ヘッダー / 進捗 ---- */
.quiz-header { margin-bottom: 14px; }
.progress-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.progress-label { font-size: 14px; font-weight: 700; color: var(--moss-dark); }
.type-badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--moss-dark);
  background: var(--moss-tint);
  border: 1px solid var(--line);
  padding: 3px 10px;
  border-radius: 999px;
}
.progress-bar { height: 8px; background: #d5e0cf; border-radius: 999px; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--moss), var(--moss-dark)); border-radius: 999px; transition: width 0.3s ease; }

/* ---- 問題文 ---- */
.question-text { font-size: 18.5px; font-weight: 600; color: var(--ink); margin: 2px 0 20px; line-height: 1.6; }

/* ---- 回答エリア ---- */
.answer-area { display: flex; flex-direction: column; gap: 12px; }

/* 選択肢ボタン（choice / multi） */
.opt {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  font-family: inherit;
  font-size: 16.5px;
  font-weight: 500;
  color: var(--ink);
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 14px;
  padding: 15px 16px;
  min-height: 56px;
  cursor: pointer;
  transition: border-color 0.12s ease, background 0.12s ease, transform 0.06s ease;
  -webkit-tap-highlight-color: transparent;
}
.opt:active { transform: scale(0.99); }
.opt:hover { border-color: #b9cbb4; }
.opt .box {
  flex: 0 0 auto;
  width: 24px; height: 24px;
  border: 2px solid #b7c6b2;
  border-radius: 6px;
  display: grid; place-items: center;
  font-size: 15px; color: #fff;
}
.opt.selected { border-color: var(--moss); background: var(--moss-tint); }
.opt.selected .box { background: var(--moss); border-color: var(--moss); }

/* 〇× 大ボタン */
.tf-row { display: flex; gap: 14px; }
.tf {
  flex: 1;
  font-family: inherit;
  font-size: 40px;
  font-weight: 700;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 18px;
  padding: 22px 0;
  min-height: 104px;
  cursor: pointer;
  color: var(--moss-dark);
  transition: border-color 0.12s ease, background 0.12s ease, transform 0.06s ease;
  -webkit-tap-highlight-color: transparent;
}
.tf:active { transform: scale(0.98); }
.tf-maru { color: #cf3f3f; }
.tf-batsu { color: #4a5fa0; }

/* 写真3択 */
.photo-grid { display: flex; flex-direction: column; gap: 12px; }
.photo-opt {
  position: relative;
  border: 3px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: #eef1ec;
  cursor: pointer;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 0.12s ease, transform 0.06s ease;
}
.photo-opt:active { transform: scale(0.99); }
.photo-opt img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
.photo-opt .pos {
  position: absolute; top: 8px; left: 8px;
  background: rgba(51, 72, 47, 0.82); color: #fff;
  font-size: 13px; font-weight: 700;
  padding: 3px 11px; border-radius: 999px;
}
.photo-opt .imgfail {
  display: grid; place-items: center; aspect-ratio: 4 / 3;
  color: var(--ink-soft); font-size: 13px; padding: 10px; text-align: center;
}

/* 判定後の強調 */
.opt.correct, .tf.correct, .photo-opt.correct { border-color: var(--correct); background: var(--correct-bg); }
.opt.correct .box { background: var(--correct); border-color: var(--correct); }
.opt.wrong, .tf.wrong, .photo-opt.wrong { border-color: var(--wrong); background: var(--wrong-bg); }
.opt.wrong .box { background: var(--wrong); border-color: var(--wrong); }
.mark-tag {
  position: absolute; top: 8px; right: 8px;
  font-size: 13px; font-weight: 700; color: #fff;
  padding: 3px 11px; border-radius: 999px;
}
.mark-tag.ok { background: var(--correct); }
.mark-tag.ng { background: var(--wrong); }
.opt .mark-inline { margin-left: auto; font-weight: 700; }
.opt.correct .mark-inline { color: var(--correct); }
.opt.wrong .mark-inline { color: var(--wrong); }

.locked { pointer-events: none; }
.dim { opacity: 0.55; }

/* multi ヒント */
.multi-hint { font-size: 13px; color: var(--ink-soft); margin: 14px 0 0; text-align: center; }
#btn-submit { margin-top: 18px; }

/* ---- フィードバック ---- */
.feedback { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 18px; }
.feedback-mark { font-size: 20px; font-weight: 700; margin: 0 0 10px; }
.feedback-mark.ok { color: var(--correct); }
.feedback-mark.ng { color: var(--wrong); }
.explanation {
  background: var(--moss-tint);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 14.5px;
  color: var(--ink);
  line-height: 1.7;
  margin-bottom: 18px;
}
.explanation .ans-line { font-weight: 700; color: var(--moss-dark); display: block; margin-bottom: 6px; }

/* ---- 結果画面 ---- */
.result-title { font-size: 20px; color: var(--moss-deep); margin: 4px 0 8px; }
.score { font-size: 20px; color: var(--ink-soft); margin: 6px 0 4px; font-weight: 600; }
.score #score-num { font-size: 52px; font-weight: 800; color: var(--moss); vertical-align: -6px; }
.score-slash { margin: 0 6px; }
.score-comment { font-size: 15px; color: var(--moss-dark); font-weight: 600; margin: 8px 0 0; }

.review-wrap { margin-top: 22px; }
.review-heading { font-size: 16px; color: var(--moss-dark); margin: 0 0 12px; }
.review-list { display: flex; flex-direction: column; gap: 12px; }
.review-item { background: var(--card); border-radius: 14px; box-shadow: var(--shadow); padding: 16px; }
.review-q { font-size: 15.5px; font-weight: 700; color: var(--ink); margin: 0 0 8px; }
.review-a { font-size: 14px; margin: 4px 0; }
.review-a .lab { font-weight: 700; }
.review-a.correct .lab { color: var(--correct); }
.review-a.yours .lab { color: var(--wrong); }
.review-exp { font-size: 13.5px; color: var(--ink-soft); margin: 8px 0 0; line-height: 1.65; }
.perfect-text { text-align: center; font-size: 17px; font-weight: 700; color: var(--moss); margin: 24px 0; }

#btn-restart { margin-top: 24px; }
#btn-share, #btn-ch-share { margin-top: 16px; }

/* ---- おすすめカード ---- */
.recommend-card { margin-top: 16px; text-align: left; }
.rec-tag { display: inline-block; font-size: 12px; font-weight: 700; color: #fff; background: var(--moss); padding: 3px 12px; border-radius: 999px; margin-bottom: 10px; }
.rec-title { font-size: 16.5px; color: var(--moss-deep); margin: 0 0 8px; }
.rec-text { font-size: 14px; color: var(--ink-soft); line-height: 1.7; margin: 0 0 16px; }
.recommend-card .btn-outline { width: 100%; padding: 13px; }

/* ---- チャレンジ：タイマー ---- */
.ch-timer { font-size: 15px; font-weight: 800; color: var(--moss-dark); font-variant-numeric: tabular-nums; }
.timer-fill { background: linear-gradient(90deg, #e2a24d, #d18234); transition: width 0.2s linear; }
.timer-fill.low { background: linear-gradient(90deg, #e06a4a, #c0402a); }

/* ---- チャレンジ：クーポン ---- */
.coupon-box {
  margin: 20px 0 8px;
  border: 2px dashed #d18234;
  background: linear-gradient(180deg, #fff8ee, #fdefda);
  border-radius: 14px;
  padding: 18px 16px;
}
.coupon-label { font-size: 13px; font-weight: 700; color: #b06a24; margin: 0 0 6px; letter-spacing: 0.05em; }
.coupon-code {
  font-size: 26px; font-weight: 800; color: #a85a1c; letter-spacing: 0.06em;
  background: #fff; border-radius: 10px; padding: 12px 8px; margin: 0 0 12px;
  border: 1px solid #e6d3b3; word-break: break-all;
}
.coupon-msg { font-size: 13px; color: var(--ink-soft); line-height: 1.65; margin: 0 0 16px; }
.coupon-box .btn-primary { width: 100%; display: block; text-align: center; text-decoration: none; line-height: 1.4; }
#coupon-copy { width: 100%; margin: 0 0 14px; padding: 11px; font-size: 15px; background: #fff; border-color: #d18234; color: #a85a1c; }
#coupon-copy:hover { background: #fff3e2; }

#ch-fail .btn-challenge { margin-top: 8px; }
#ch-fail .btn-outline, #ch-success .btn-share { width: 100%; }
#btn-ch-study { margin-top: 10px; width: 100%; }
#btn-ch-back { margin-top: 18px; }

/* 少し広い画面 */
@media (min-width: 480px) {
  .photo-grid { display: grid; grid-template-columns: 1fr; }
}