:root {
  --bg1: #fff6e5;
  --bg2: #ffe7c4;
  --ink: #3a2a1a;
  --muted: #8a7a68;
  --card: #ffffff;
  --primary: #ff8c42;
  --primary-dark: #f2691d;
  --accent: #ff6b6b;
  --teal: #38c7a4;
  --line: #f3ddbf;
  --radius: 26px;
  --shadow: 0 10px 26px rgba(242, 105, 29, 0.14);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
  color: var(--ink);
  background: linear-gradient(160deg, var(--bg1), var(--bg2));
  min-height: 100vh;
}

button { font: inherit; cursor: pointer; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand { display: flex; align-items: center; gap: 0.55rem; font-weight: 800; font-size: 1.15rem; }
.brand-emoji { font-size: 1.5rem; }
.date-badge {
  background: #fff;
  border: 2px solid var(--primary);
  color: var(--primary-dark);
  font-weight: 700;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.95rem;
}

.page {
  width: min(1040px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: 1.5rem 0 4rem;
}

.hero {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
}

.eyebrow { color: var(--primary-dark); font-weight: 800; letter-spacing: 0.15em; margin: 0; }

h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  margin: 0.6rem 0 1.4rem;
}

.stats { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.stat {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1rem 1.6rem;
  box-shadow: var(--shadow);
  border: 2px solid var(--line);
  min-width: 110px;
}
.stat-num { display: block; font-size: 2rem; font-weight: 800; color: var(--primary-dark); }
.stat-label { color: var(--muted); font-size: 0.9rem; }

section {
  margin-top: 1.6rem;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
h2 { margin: 0 0 1rem; font-size: 1.4rem; }
.section-note { color: var(--muted); font-size: 0.95rem; }

.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1rem;
}
.word-card {
  border: 0;
  border-radius: 22px;
  padding: 1rem;
  color: #fff;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
  min-height: 132px;
}
.word-card:hover { transform: translateY(-4px); }
.word-char { font-size: 3.4rem; font-weight: 900; line-height: 1.1; }
.word-emoji { font-size: 1.4rem; display: block; margin-top: 0.35rem; }
.word-pinyin { font-size: 1rem; opacity: 0.95; margin-top: 0.35rem; display: block; }

/* 五张字卡不同渐变 */
.wc-0 { background: linear-gradient(150deg, #ff9f68, #ff6b6b); }
.wc-1 { background: linear-gradient(150deg, #5ac8fa, #3f8cff); }
.wc-2 { background: linear-gradient(150deg, #67d59a, #2eb872); }
.wc-3 { background: linear-gradient(150deg, #ffd166, #ffb020); }
.wc-4 { background: linear-gradient(150deg, #c39bff, #8f6bff); }

.checkin-tip { color: var(--muted); margin: 0 0 1rem; }
.checkin-row { display: flex; align-items: center; gap: 1.2rem; flex-wrap: wrap; }
.master-options { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.master-option {
  border: 2px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 999px;
  padding: 0.5rem 0.9rem;
  font-weight: 700;
}
.master-option.active { background: var(--teal); border-color: var(--teal); color: #fff; }
.big-btn {
  border: 0;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  box-shadow: var(--shadow);
  font-size: 1.05rem;
}
.big-btn:hover { background: var(--primary-dark); }
.big-btn:disabled { background: #d8cdbb; cursor: not-allowed; box-shadow: none; }
.feedback { margin-top: 0.9rem; font-weight: 700; min-height: 1.3em; }
.feedback.ok { color: var(--teal); }
.feedback.err { color: var(--accent); }

.chip-wrap { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.chip {
  border-radius: 999px;
  padding: 0.5rem 0.9rem;
  font-weight: 700;
  background: #fff;
  border: 2px solid var(--line);
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.chip .c-emoji { font-size: 1rem; }
.chip.learned { border-color: var(--teal); color: #1f8f6e; background: #e6f8f2; }
.chip.today { border-color: var(--primary); color: var(--primary-dark); background: #fff1e1; }

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(60, 40, 20, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1rem;
}
.card-modal {
  background: #fff;
  border-radius: 30px;
  padding: 2rem 2.4rem;
  text-align: center;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.28);
  position: relative;
  max-width: 360px;
  width: 100%;
}
.close-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.9rem;
  background: none;
  border: 0;
  font-size: 2rem;
  color: var(--muted);
  line-height: 1;
}
.modal-emoji { font-size: 2.6rem; }
.modal-char { font-size: 6rem; font-weight: 900; margin: 0.2rem 0; color: var(--primary-dark); }
.modal-pinyin { font-size: 1.5rem; color: var(--muted); }
.modal-extra { margin-top: 0.7rem; color: var(--ink); font-size: 1.1rem; line-height: 1.6; }
.speak-btn {
  margin-top: 1.1rem;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 999px;
  padding: 0.75rem 1.4rem;
  font-weight: 800;
  font-size: 1.05rem;
}

@media (max-width: 560px) {
  .page { padding-top: 1rem; }
  section { padding: 1.1rem; }
  .word-grid { grid-template-columns: repeat(2, 1fr); }
}