/* ============================================================
 * 田園詩童 · P1 高級設計（升級版）
 * 色板：暖米 #F5EFE0 / 墨綠 #3A5F3D / 朱紅 #D9534F
 * 字體：楷體（標題） + 思源宋體（正文）
 * 升級要點：
 *   1. 宣紙紋理背景（SVG noise filter）
 *   2. 水墨遠山 SVG 插畫（首頁 banner）
 *   3. 篆刻印章升級（SVG 印泥效果）
 *   4. 粒子動效（答對 confetti）
 *   5. 微交互：按鈕水波紋、卡片浮起、答錯紅暈
 *   6. 古風底紋：祥雲 + 水波
 *   7. 底部安全區適配
 * ============================================================ */

:root {
  /* 基礎色 */
  --c-bg:        #F5EFE0;
  --c-bg-soft:   #FAF5E9;
  --c-paper:     #FFFCF4;
  --c-paper-warm:#FDF6E8;
  --c-ink:       #2A2A2A;
  --c-ink-soft:  #5A5A5A;
  --c-line:      #D9CFB7;

  /* 品牌色 */
  --c-green:     #3A5F3D;
  --c-green-soft:#5C7F5F;
  --c-green-deep:#2A4A2D;
  --c-red:       #D9534F;
  --c-red-dark:  #B23A36;
  --c-red-deep:  #8B2A26;
  --c-gold:      #C9A668;
  --c-gold-deep: #9C7E48;
  --c-cinnabar:  #C03434;   /* 印泥朱砂 */

  /* 狀態色 */
  --c-correct:   #4F9D5C;
  --c-wrong:     #D9534F;

  /* 陰影 */
  --c-shadow:        rgba(58, 95, 61, 0.12);
  --c-shadow-strong: rgba(58, 95, 61, 0.25);
  --c-shadow-deep:   rgba(58, 95, 61, 0.40);

  /* 半徑 */
  --r-xs: 4px;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 32px;

  /* 字體 */
  --f-title: "Kaiti", "STKaiti", "DFKai-SB", "BiauKai", "楷体", "KaiTi", "STZhongsong", serif;
  --f-body:  "Source Han Serif SC", "Source Han Serif CN", "Noto Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", "SimSun", serif;
  --f-num:   "Optima", "Georgia", serif;

  /* 動畫曲線 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

/* ============================================================
 * 全域重置
 * ============================================================ */
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0; padding: 0;
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overscroll-behavior-y: none;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  background:
    /* 暖米漸層 */
    radial-gradient(ellipse at top, #FAF5E9 0%, var(--c-bg) 60%) no-repeat;
  position: relative;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

/* 宣紙紋理（SVG noise filter 内嵌） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.78 0 0 0 0 0.65 0 0 0 0 0.45 0 0 0 0.13 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  mix-blend-mode: multiply;
}

/* 底部裝飾水波紋 */
body::after {
  content: "";
  position: fixed;
  left: 0; right: 0; bottom: 0;
  height: 80px;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 20% 100%, rgba(58,95,61,0.04) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(201,166,104,0.05) 0%, transparent 60%);
}

a { color: var(--c-green); text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
img { max-width: 100%; display: block; }

.hidden { display: none !important; }
.app, .topbar, #modal-root, #toast { position: relative; z-index: 1; }

/* ============================================================
 * 頂部導航
 * ============================================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  padding: 0 8px;
  background: linear-gradient(180deg, rgba(245,239,224,0.98), rgba(245,239,224,0.92));
  backdrop-filter: blur(10px) saturate(1.2);
  -webkit-backdrop-filter: blur(10px) saturate(1.2);
  border-bottom: 1px solid var(--c-line);
}

.topbar-title {
  margin: 0;
  font-family: var(--f-title);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-green);
  letter-spacing: 0.18em;
  position: relative;
}

/* 標題旁邊加一個小印章 */
.topbar-title::after {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--c-cinnabar);
  border-radius: 1px;
  margin-left: 6px;
  vertical-align: middle;
  transform: translateY(-3px) rotate(8deg);
  box-shadow: 0 0 0 1px rgba(192,52,52,0.18);
}

.topbar-back {
  width: 36px; height: 36px;
  background: transparent;
  border: none;
  font-size: 30px;
  line-height: 30px;
  color: var(--c-green);
  font-family: var(--f-title);
  padding: 0;
  border-radius: 50%;
  transition: background 0.2s;
}
.topbar-back:active { background: rgba(58,95,61,0.08); }
.topbar-spacer { width: 36px; height: 36px; flex: 0 0 36px; }

/* ============================================================
 * 主容器
 * ============================================================ */
.app {
  max-width: 540px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  min-height: calc(100vh - 52px);
  min-height: calc(100dvh - 52px);
}

/* ============================================================
 * 通用卡片（升級質感）
 * ============================================================ */
.card {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  padding: 16px;
  box-shadow:
    0 2px 8px var(--c-shadow),
    inset 0 1px 0 rgba(255,255,255,0.6);
}
.card + .card { margin-top: 12px; }

.card-title {
  margin: 0 0 8px;
  font-family: var(--f-title);
  font-size: 18px;
  color: var(--c-green);
  font-weight: 600;
}
.card-sub { color: var(--c-ink-soft); font-size: 14px; }

/* ============================================================
 * 按鈕（升級水波紋 + 微互動）
 * ============================================================ */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border: none;
  border-radius: 999px;
  font-family: var(--f-title);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-paper);
  background: var(--c-green);
  transition: transform 0.1s var(--ease-out), box-shadow 0.2s, background 0.2s;
  user-select: none;
  overflow: hidden;
  box-shadow:
    0 4px 10px rgba(58,95,61,0.25),
    inset 0 1px 0 rgba(255,255,255,0.18);
}
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--rx,50%) var(--ry,50%), rgba(255,255,255,0.45) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.25s;
  pointer-events: none;
}
.btn:active { transform: scale(0.96); }
.btn:active::before { opacity: 1; transition: opacity 0s; }

.btn-primary {
  background: linear-gradient(180deg, #E16562 0%, var(--c-red) 100%);
  color: #FFFCF4;
  box-shadow:
    0 5px 14px rgba(217,83,79,0.35),
    inset 0 1px 0 rgba(255,255,255,0.25);
}
.btn-primary:active { background: linear-gradient(180deg, var(--c-red) 0%, var(--c-red-dark) 100%); }

.btn-ghost {
  background: transparent;
  color: var(--c-green);
  border: 1.5px solid var(--c-green);
  box-shadow: none;
}
.btn-ghost:active { background: rgba(58,95,61,0.08); }

.btn-block { display: flex; width: 100%; }
.btn-lg { min-height: 54px; font-size: 18px; letter-spacing: 0.18em; }
.btn:disabled { background: #BBB; color: #EEE; box-shadow: none; opacity: 0.7; }

/* ============================================================
 * 首頁 / 啟動頁（升級：水墨遠山 + 飄落花瓣）
 * ============================================================ */
.home {
  text-align: center;
  padding-top: 12px;
}

.home-banner {
  position: relative;
  height: 240px;
  border-radius: var(--r-xl);
  overflow: hidden;
  margin-bottom: 28px;
  background:
    /* 夕陽暈染 */
    radial-gradient(ellipse at 50% 80%, rgba(217,83,79,0.25) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 30%, rgba(201,166,104,0.25) 0%, transparent 50%),
    linear-gradient(180deg, #FAF0D4 0%, #E8D4A5 60%, #C9A668 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 8px 24px var(--c-shadow-strong),
    inset 0 1px 0 rgba(255,255,255,0.5);
}

/* 水墨遠山 SVG（三層：遠→近） */
.home-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 400 240' preserveAspectRatio='none'><defs><filter id='b'><feGaussianBlur stdDeviation='0.5'/></filter></defs><path d='M0,180 C60,160 100,140 140,155 C180,170 220,130 260,145 C320,135 360,160 400,150 L400,240 L0,240 Z' fill='%233A5F3D' opacity='0.25' filter='url(%23b)'/><path d='M0,200 C50,180 90,175 130,185 C170,195 210,170 250,178 C310,160 360,180 400,175 L400,240 L0,240 Z' fill='%233A5F3D' opacity='0.35' filter='url(%23b)'/><path d='M0,215 C40,205 80,210 120,200 C160,190 200,210 240,205 C290,195 340,210 400,200 L400,240 L0,240 Z' fill='%232A4A2D' opacity='0.55' filter='url(%23b)'/></svg>");
  background-size: 100% 100%;
  background-position: bottom;
  background-repeat: no-repeat;
  pointer-events: none;
}

/* 飄落花瓣（純 CSS 動畫） */
.home-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(2px 2px at 15% 20%, rgba(217,83,79,0.7), transparent),
    radial-gradient(1.5px 1.5px at 45% 35%, rgba(201,166,104,0.6), transparent),
    radial-gradient(2px 2px at 70% 25%, rgba(255,252,244,0.7), transparent),
    radial-gradient(1.5px 1.5px at 30% 60%, rgba(217,83,79,0.5), transparent),
    radial-gradient(2px 2px at 85% 50%, rgba(255,252,244,0.6), transparent);
  animation: petalFall 8s linear infinite;
  opacity: 0.7;
}

@keyframes petalFall {
  0% { transform: translateY(-20px) rotate(0deg); opacity: 0.7; }
  50% { transform: translateY(40px) translateX(8px) rotate(180deg); opacity: 0.5; }
  100% { transform: translateY(100px) translateX(-5px) rotate(360deg); opacity: 0; }
}

.home-title {
  position: relative;
  font-family: var(--f-title);
  font-size: 52px;
  font-weight: 700;
  color: var(--c-green-deep);
  letter-spacing: 0.22em;
  margin: 0;
  text-shadow:
    0 2px 0 rgba(255,255,255,0.6),
    0 4px 12px rgba(58,95,61,0.2);
  z-index: 2;
  animation: titleRise 1s var(--ease-out) backwards;
}

.home-title-stamp {
  position: absolute;
  top: 14px;
  right: 18px;
  width: 42px; height: 42px;
  background: var(--c-cinnabar);
  color: rgba(255,252,244,0.92);
  font-family: var(--f-title);
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(8deg);
  border-radius: 4px;
  box-shadow:
    0 2px 6px rgba(139,42,38,0.4),
    inset 0 0 0 1px rgba(255,255,255,0.18);
  /* 印泥磨砂邊緣 */
  background-image:
    radial-gradient(circle at 8% 8%, transparent 0%, transparent 12%, var(--c-cinnabar) 13%),
    radial-gradient(circle at 92% 92%, transparent 0%, transparent 14%, var(--c-cinnabar) 15%),
    radial-gradient(circle at 50% 50%, var(--c-cinnabar) 60%, var(--c-red-deep) 100%);
  z-index: 2;
  animation: titleRise 1.2s var(--ease-out) backwards;
}

@keyframes titleRise {
  0% { opacity: 0; transform: translateY(12px); }
  100% { opacity: 1; transform: translateY(0); }
}
.home-title-stamp { animation-name: stampIn; }
@keyframes stampIn {
  0% { opacity: 0; transform: rotate(8deg) scale(0); }
  60% { opacity: 1; transform: rotate(8deg) scale(1.15); }
  100% { opacity: 1; transform: rotate(8deg) scale(1); }
}

.home-subtitle {
  position: relative;
  margin-top: 12px;
  color: var(--c-green-soft);
  font-size: 14px;
  letter-spacing: 0.5em;
  padding-left: 0.5em;
  z-index: 2;
  animation: titleRise 1.4s var(--ease-out) backwards;
}

.home-tagline {
  margin: 0 0 32px;
  color: var(--c-ink-soft);
  font-size: 15px;
  line-height: 2;
  padding: 0 16px;
  font-family: var(--f-title);
  letter-spacing: 0.04em;
}
.home-tagline .sep { color: var(--c-gold); margin: 0 8px; font-weight: 700; }

.home-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 0 8px;
}

.home-rule {
  margin-top: 28px;
  font-size: 12px;
  color: var(--c-ink-soft);
  letter-spacing: 0.15em;
}

/* 首頁裝飾：底部波浪 */
.home::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: -8px;
  height: 6px;
  background:
    linear-gradient(90deg,
      transparent 0%,
      var(--c-gold) 20%,
      var(--c-red) 50%,
      var(--c-gold) 80%,
      transparent 100%);
  opacity: 0.4;
}

/* ============================================================
 * 關卡列表（升級：水墨暈染邊框 + 印章）
 * ============================================================ */
.levels-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 4px 4px 18px;
}
.levels-title {
  margin: 0;
  font-family: var(--f-title);
  font-size: 24px;
  color: var(--c-green);
  font-weight: 700;
  letter-spacing: 0.1em;
}
.levels-stat {
  font-size: 13px;
  color: var(--c-ink-soft);
  font-family: var(--f-num);
}

.levels-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.level-card {
  position: relative;
  background:
    linear-gradient(135deg, var(--c-paper) 0%, var(--c-paper-warm) 100%);
  border: 1.5px solid var(--c-line);
  border-radius: var(--r-md);
  padding: 16px 12px 14px;
  text-align: center;
  box-shadow:
    0 3px 10px var(--c-shadow),
    inset 0 1px 0 rgba(255,255,255,0.7);
  transition: transform 0.12s var(--ease-out), box-shadow 0.2s, border-color 0.2s;
  overflow: hidden;
}
.level-card.unlocked { cursor: pointer; }
.level-card.unlocked:hover {
  transform: translateY(-2px);
  box-shadow:
    0 6px 18px var(--c-shadow-strong),
    inset 0 1px 0 rgba(255,255,255,0.7);
  border-color: var(--c-gold);
}
.level-card.unlocked:active { transform: translateY(0) scale(0.97); }
.level-card.completed {
  border-color: var(--c-cinnabar);
  background:
    linear-gradient(135deg, var(--c-paper-warm) 0%, #F8E8D8 100%);
}
.level-card.locked { opacity: 0.55; filter: grayscale(0.5); }

/* 鎖定圖標改為 SVG（不再用 emoji） */
.level-card .lock-icon {
  width: 32px; height: 32px;
  margin: 0 auto 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-ink-soft);
}

.level-card .lvl-no {
  display: inline-block;
  font-family: var(--f-num);
  font-size: 11px;
  color: var(--c-gold-deep);
  letter-spacing: 0.18em;
  margin-bottom: 4px;
  font-weight: 600;
}
.level-card .lvl-title {
  margin: 4px 0 4px;
  font-family: var(--f-title);
  font-size: 18px;
  color: var(--c-green-deep);
  font-weight: 700;
  letter-spacing: 0.05em;
}
.level-card .lvl-author {
  margin: 0;
  font-size: 12px;
  color: var(--c-ink-soft);
}

/* 通關印章（SVG 篆刻風） */
.level-card .stamp {
  position: absolute;
  top: 8px; right: 8px;
  width: 40px; height: 40px;
  background: var(--c-cinnabar);
  color: rgba(255,252,244,0.94);
  font-family: var(--f-title);
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(-8deg);
  border-radius: 3px;
  box-shadow:
    0 2px 6px rgba(139,42,38,0.5),
    inset 0 0 0 1px rgba(255,255,255,0.2);
  /* 印泥磨砂邊緣效果 */
  background-image:
    radial-gradient(circle at 8% 8%, transparent 0%, transparent 18%, var(--c-cinnabar) 19%),
    radial-gradient(circle at 92% 92%, transparent 0%, transparent 18%, var(--c-cinnabar) 19%),
    var(--c-cinnabar);
  animation: stampDrop 0.6s var(--ease-out) backwards;
}
.level-card.completed .stamp::after { content: "通"; }

@keyframes stampDrop {
  0% { opacity: 0; transform: rotate(-8deg) scale(2.5); }
  60% { opacity: 1; transform: rotate(-8deg) scale(0.9); }
  100% { opacity: 1; transform: rotate(-8deg) scale(1); }
}

/* ============================================================
 * 答題頁（升級：詩詞卡片質感 + 答題動效）
 * ============================================================ */
.level-page { padding: 0; }

.poem-card {
  background:
    linear-gradient(135deg, var(--c-paper) 0%, var(--c-paper-warm) 100%);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  padding: 20px 20px 16px;
  margin-bottom: 16px;
  box-shadow:
    0 4px 16px var(--c-shadow),
    inset 0 1px 0 rgba(255,255,255,0.7);
  position: relative;
  overflow: hidden;
}
/* 詩卡頂部裝飾線 + 角花 */
.poem-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg,
    var(--c-green) 0%,
    var(--c-gold) 50%,
    var(--c-red) 100%);
}
.poem-card::after {
  content: "❀";
  position: absolute;
  top: 10px;
  right: 14px;
  color: var(--c-gold);
  font-size: 16px;
  opacity: 0.5;
}

.poem-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 4px;
}
.poem-title {
  margin: 0;
  font-family: var(--f-title);
  font-size: 28px;
  color: var(--c-green-deep);
  font-weight: 700;
  letter-spacing: 0.08em;
  position: relative;
  padding-right: 28px;
}
/* 標題後加一個小紅點裝飾 */
.poem-title::after {
  content: "";
  position: absolute;
  right: 0;
  top: 6px;
  width: 8px; height: 8px;
  background: var(--c-cinnabar);
  border-radius: 1px;
  transform: rotate(8deg);
  box-shadow: 0 0 0 2px rgba(192,52,52,0.15);
}

.poem-author {
  font-size: 13px;
  color: var(--c-ink-soft);
  font-family: var(--f-title);
}
.poem-author .dynasty {
  color: var(--c-gold-deep);
  margin-right: 4px;
  font-weight: 600;
}

.poem-body {
  margin: 16px 0 10px;
  font-family: var(--f-title);
  font-size: 20px;
  line-height: 2.2;
  color: var(--c-ink);
  text-align: center;
  letter-spacing: 0.06em;
}
.poem-body p { margin: 0; }

.poem-intro {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--c-ink-soft);
  line-height: 1.7;
  padding-top: 10px;
  border-top: 1px dashed var(--c-line);
}

/* 音頻控制條（升級） */
.audio-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding: 10px 14px;
  background:
    linear-gradient(180deg, var(--c-bg-soft) 0%, #F0E6D0 100%);
  border-radius: 999px;
  border: 1px solid var(--c-line);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.5);
}

.audio-btn {
  width: 42px; height: 42px;
  flex: 0 0 42px;
  border: none;
  background: linear-gradient(180deg, #E16562 0%, var(--c-red) 100%);
  color: #FFFCF4;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  box-shadow:
    0 3px 8px rgba(217,83,79,0.35),
    inset 0 1px 0 rgba(255,255,255,0.3);
  transition: transform 0.1s, background 0.2s;
}
.audio-btn:active { transform: scale(0.92); }
.audio-btn.playing {
  background: linear-gradient(180deg, var(--c-green-soft) 0%, var(--c-green) 100%);
  box-shadow:
    0 3px 8px rgba(58,95,61,0.35),
    inset 0 1px 0 rgba(255,255,255,0.3);
  animation: audioPulse 1.5s ease-in-out infinite;
}
@keyframes audioPulse {
  0%, 100% { box-shadow: 0 3px 8px rgba(58,95,61,0.35), 0 0 0 0 rgba(58,95,61,0.4); }
  50% { box-shadow: 0 3px 8px rgba(58,95,61,0.35), 0 0 0 8px rgba(58,95,61,0); }
}

.audio-progress {
  flex: 1;
  height: 6px;
  background: var(--c-line);
  border-radius: 3px;
  overflow: hidden;
}
.audio-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--c-green) 0%, var(--c-gold) 100%);
  border-radius: 3px;
  transition: width 0.2s linear;
}
.audio-time {
  font-family: var(--f-num);
  font-size: 11px;
  color: var(--c-ink-soft);
  min-width: 76px;
  text-align: right;
  letter-spacing: 0.05em;
}

/* 知識卡片（升級） */
.knowledge-card {
  background:
    linear-gradient(135deg, var(--c-paper) 0%, var(--c-paper-warm) 100%);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  padding: 14px;
  margin-bottom: 16px;
  display: flex;
  gap: 14px;
  align-items: stretch;
  box-shadow: 0 2px 8px var(--c-shadow);
}
.knowledge-card .kc-img {
  width: 96px; height: 96px;
  flex: 0 0 96px;
  border-radius: var(--r-sm);
  background: var(--c-bg-soft) center/cover no-repeat;
  border: 1px solid var(--c-line);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.5);
}
.knowledge-card .kc-text {
  flex: 1;
  font-size: 14px;
  color: var(--c-ink);
  line-height: 1.7;
}
.knowledge-card .kc-label {
  display: inline-block;
  font-family: var(--f-title);
  font-size: 13px;
  color: var(--c-gold-deep);
  margin-bottom: 6px;
  letter-spacing: 0.15em;
  font-weight: 600;
  border-bottom: 1px dashed var(--c-gold);
  padding-bottom: 2px;
}

/* 答題區（升級） */
.quiz-card {
  background:
    linear-gradient(135deg, var(--c-paper) 0%, var(--c-paper-warm) 100%);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  padding: 18px 18px 16px;
  margin-bottom: 16px;
  box-shadow:
    0 3px 10px var(--c-shadow),
    inset 0 1px 0 rgba(255,255,255,0.7);
  position: relative;
}
.quiz-card::before {
  content: "";
  position: absolute;
  top: -1px; left: 16px;
  width: 24px; height: 3px;
  background: var(--c-red);
  border-radius: 0 0 2px 2px;
}

.quiz-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--c-ink-soft);
  font-family: var(--f-num);
  letter-spacing: 0.05em;
}
.quiz-progress-bar {
  height: 5px;
  background: var(--c-line);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 16px;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.06);
}
.quiz-progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-green) 0%, var(--c-gold) 100%);
  border-radius: 3px;
  transition: width 0.4s var(--ease-out);
  box-shadow: 0 0 8px rgba(58,95,61,0.3);
}
.quiz-question {
  margin: 0 0 16px;
  font-family: var(--f-title);
  font-size: 18px;
  color: var(--c-ink);
  line-height: 1.7;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.quiz-opt {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  background: var(--c-paper);
  border: 1.5px solid var(--c-line);
  border-radius: var(--r-sm);
  text-align: left;
  font-family: var(--f-body);
  font-size: 15px;
  color: var(--c-ink);
  cursor: pointer;
  transition: all 0.15s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.quiz-opt::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--rx,50%) var(--ry,50%), rgba(58,95,61,0.08) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.quiz-opt:hover { border-color: var(--c-green); }
.quiz-opt:hover::before { opacity: 1; }
.quiz-opt:active { transform: scale(0.99); }

.quiz-opt .opt-letter {
  width: 30px; height: 30px;
  flex: 0 0 30px;
  border-radius: 50%;
  background: var(--c-bg-soft);
  border: 1.5px solid var(--c-green);
  color: var(--c-green);
  font-family: var(--f-title);
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.quiz-opt.selected { border-color: var(--c-green); }
.quiz-opt.correct {
  border-color: var(--c-correct);
  background: linear-gradient(135deg, #F0F8E8 0%, #E5F2DC 100%);
}
.quiz-opt.correct .opt-letter {
  background: var(--c-correct);
  color: #FFFCF4;
  border-color: var(--c-correct);
  box-shadow: 0 0 0 3px rgba(79,157,92,0.2);
}
.quiz-opt.wrong {
  border-color: var(--c-wrong);
  background: linear-gradient(135deg, #FCEDE8 0%, #F8DDD8 100%);
  animation: wrongShake 0.4s;
}
.quiz-opt.wrong .opt-letter {
  background: var(--c-wrong);
  color: #FFFCF4;
  border-color: var(--c-wrong);
}
.quiz-opt:disabled, .quiz-opt.locked { cursor: default; }

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-4px); }
  40%, 80% { transform: translateX(4px); }
}

.quiz-hint {
  margin-top: 14px;
  padding: 12px 14px;
  background: linear-gradient(135deg, rgba(201,166,104,0.10) 0%, rgba(201,166,104,0.18) 100%);
  border-left: 3px solid var(--c-gold);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 13px;
  color: var(--c-ink);
  line-height: 1.7;
  animation: hintSlide 0.3s var(--ease-out) backwards;
  position: relative;
}
.quiz-hint::before {
  content: "✦ 提示";
  display: inline-block;
  font-family: var(--f-title);
  font-size: 11px;
  color: var(--c-gold-deep);
  font-weight: 700;
  letter-spacing: 0.15em;
  margin-bottom: 4px;
}

@keyframes hintSlide {
  0% { opacity: 0; transform: translateX(-8px); }
  100% { opacity: 1; transform: translateX(0); }
}

/* 答對粒子動效（confetti） */
.confetti-host {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 200px;
  pointer-events: none;
  overflow: visible;
  z-index: 5;
}
.confetti-piece {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  animation: confettiFly 1s ease-out forwards;
}
@keyframes confettiFly {
  0% { transform: translate(0,0) rotate(0deg); opacity: 1; }
  100% { transform: translate(var(--dx), var(--dy)) rotate(var(--dr, 720deg)); opacity: 0; }
}

/* ============================================================
 * 圖鑑頁（升級：宣紙卡 + 竹簡效果）
 * ============================================================ */
.collection-header {
  margin: 4px 4px 18px;
}
.collection-title {
  margin: 0 0 4px;
  font-family: var(--f-title);
  font-size: 24px;
  color: var(--c-green);
  font-weight: 700;
  letter-spacing: 0.1em;
}
.collection-sub {
  font-size: 13px;
  color: var(--c-ink-soft);
  font-family: var(--f-num);
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.collection-item {
  aspect-ratio: 3 / 4;
  background:
    linear-gradient(135deg, var(--c-paper) 0%, var(--c-paper-warm) 100%);
  border: 1.5px solid var(--c-line);
  border-radius: var(--r-md);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  box-shadow:
    0 2px 6px var(--c-shadow),
    inset 0 1px 0 rgba(255,255,255,0.6);
  transition: transform 0.15s var(--ease-out), box-shadow 0.2s;
}
.collection-item.unlocked:hover {
  transform: translateY(-3px);
  box-shadow:
    0 6px 14px var(--c-shadow-strong),
    inset 0 1px 0 rgba(255,255,255,0.6);
}
.collection-item.unlocked:active { transform: translateY(0) scale(0.97); }
.collection-item.locked { opacity: 0.5; filter: grayscale(0.8); }

/* 未解鎖卡片加古代封條 */
.collection-item.locked::after {
  content: "";
  position: absolute;
  top: 35%; left: 50%;
  transform: translate(-50%, -50%) rotate(-12deg);
  width: 60%; height: 24px;
  background: var(--c-cinnabar);
  border-radius: 2px;
  box-shadow: 0 1px 3px rgba(139,42,38,0.4);
}
.collection-item.locked::before {
  content: "未 解 鎖";
  position: absolute;
  top: 35%; left: 50%;
  transform: translate(-50%, -50%) rotate(-12deg);
  color: rgba(255,252,244,0.95);
  font-family: var(--f-title);
  font-size: 12px;
  letter-spacing: 0.2em;
  z-index: 2;
  font-weight: 700;
}

.collection-item .ci-img {
  width: 100%; height: 60%;
  background: center/cover no-repeat;
  background-color: var(--c-bg-soft);
  position: relative;
}
/* 已解鎖卡片圖片加暖色調 */
.collection-item.unlocked .ci-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(245,239,224,0.4) 100%);
  pointer-events: none;
}

.collection-item .ci-meta {
  padding: 6px 6px 8px;
  text-align: center;
}
.collection-item .ci-title {
  margin: 0;
  font-family: var(--f-title);
  font-size: 13px;
  color: var(--c-green-deep);
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 0.05em;
}
.collection-item .ci-author {
  margin: 0;
  font-size: 10px;
  color: var(--c-ink-soft);
}

/* ============================================================
 * 記錄頁（升級：竹簡風）
 * ============================================================ */
.record-page { padding: 0; }
.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 18px;
}
.stat-cell {
  background:
    linear-gradient(135deg, var(--c-paper) 0%, var(--c-paper-warm) 100%);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  padding: 20px 14px;
  text-align: center;
  box-shadow:
    0 3px 8px var(--c-shadow),
    inset 0 1px 0 rgba(255,255,255,0.6);
  position: relative;
  overflow: hidden;
}
.stat-cell::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--c-gold) 0%, transparent 100%);
}
.stat-num {
  font-family: var(--f-num);
  font-size: 38px;
  color: var(--c-cinnabar);
  font-weight: 700;
  line-height: 1.1;
  text-shadow: 0 1px 0 rgba(255,255,255,0.8);
}
.stat-label {
  margin-top: 6px;
  font-size: 12px;
  color: var(--c-ink-soft);
  letter-spacing: 0.12em;
  font-family: var(--f-title);
}
.record-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0 8px;
}
.record-uid {
  margin: 0 0 16px;
  padding: 12px 14px;
  background: var(--c-bg-soft);
  border: 1px dashed var(--c-line);
  border-radius: var(--r-sm);
  font-size: 12px;
  color: var(--c-ink-soft);
  word-break: break-all;
}
.record-uid b {
  color: var(--c-gold-deep);
  font-family: var(--f-title);
}

/* ============================================================
 * 通用彈窗（升級：印章動效）
 * ============================================================ */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
  animation: fadeIn 0.25s var(--ease-out);
}
.modal-card {
  background:
    linear-gradient(135deg, var(--c-paper) 0%, var(--c-paper-warm) 100%);
  border-radius: var(--r-xl);
  padding: 28px 22px 22px;
  max-width: 360px;
  width: 100%;
  text-align: center;
  box-shadow:
    0 16px 48px rgba(0,0,0,0.3),
    inset 0 1px 0 rgba(255,255,255,0.6);
  animation: modalIn 0.35s var(--ease-out);
  position: relative;
  overflow: hidden;
}
/* 彈窗頂部裝飾線 */
.modal-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-red) 50%, var(--c-gold) 100%);
}

@keyframes modalIn {
  0% { transform: scale(0.85) translateY(20px); opacity: 0; }
  100% { transform: scale(1) translateY(0); opacity: 1; }
}

.modal-title {
  margin: 0 0 16px;
  font-family: var(--f-title);
  font-size: 24px;
  color: var(--c-green-deep);
  font-weight: 700;
  letter-spacing: 0.12em;
}
.modal-body {
  margin-bottom: 22px;
  color: var(--c-ink);
  font-size: 15px;
  line-height: 1.8;
}
.modal-body img {
  max-width: 100%;
  border-radius: var(--r-sm);
  margin: 0 auto 10px;
  border: 1px solid var(--c-line);
}

/* 通關印章（升級版） */
.modal-body .card-stamp {
  display: inline-flex;
  width: 72px; height: 72px;
  border-radius: 4px;
  background: var(--c-cinnabar);
  color: rgba(255,252,244,0.94);
  font-family: var(--f-title);
  font-size: 32px;
  font-weight: 700;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  transform: rotate(-8deg);
  box-shadow:
    0 4px 12px rgba(139,42,38,0.5),
    inset 0 0 0 2px rgba(255,255,255,0.18);
  /* 印泥磨砂邊緣 */
  background-image:
    radial-gradient(circle at 10% 10%, transparent 0%, transparent 16%, var(--c-cinnabar) 17%),
    radial-gradient(circle at 90% 90%, transparent 0%, transparent 16%, var(--c-cinnabar) 17%),
    var(--c-cinnabar);
  animation: stampDropBig 0.6s var(--ease-out) backwards;
}
@keyframes stampDropBig {
  0% { opacity: 0; transform: rotate(-8deg) scale(3); }
  60% { opacity: 1; transform: rotate(-8deg) scale(0.9); }
  100% { opacity: 1; transform: rotate(-8deg) scale(1); }
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.modal-actions .btn { min-width: 110px; }

/* ============================================================
 * Toast
 * ============================================================ */
.toast {
  position: fixed;
  bottom: calc(60px + env(safe-area-inset-bottom, 0));
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(42, 42, 42, 0.92);
  color: #FFFCF4;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s var(--ease-out);
  z-index: 200;
  max-width: 80%;
  text-align: center;
  font-family: var(--f-title);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
 * 全域動畫
 * ============================================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from { transform: scale(0.85); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-4px); }
  40%, 80% { transform: translateX(4px); }
}
.shake { animation: shake 0.4s ease; }

/* ============================================================
 * 響應式
 * ============================================================ */
@media (max-width: 360px) {
  .home-title { font-size: 42px; letter-spacing: 0.15em; }
  .poem-title { font-size: 24px; }
  .poem-body { font-size: 18px; }
  .quiz-question { font-size: 16px; }
}
@media (min-width: 540px) {
  .app { padding: 28px 28px 48px; }
}
/* 深色模式：暫不開，暖米主視覺是品牌核心 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
 * 點擊波紋效果（自動由 JS 注入 .ripple 元素）
 * ============================================================ */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.6);
  pointer-events: none;
  transform: scale(0);
  animation: rippleExpand 0.6s var(--ease-out);
}
@keyframes rippleExpand {
  0% { transform: scale(0); opacity: 0.8; }
  100% { transform: scale(4); opacity: 0; }
}

/* 頁面切換淡入 */
.app > * {
  animation: pageIn 0.4s var(--ease-out);
}
@keyframes pageIn {
  0% { opacity: 0; transform: translateY(8px); }
  100% { opacity: 1; transform: translateY(0); }
}