/* 小升初暑假预习 - 共享样式表 */

:root {
  --color-bg: #fdfcfa;
  --color-text: #2b2b28;
  --color-muted: #6b6b63;
  --color-rule: #ddd8cf;
  --color-accent: #a6382e;
  --color-accent-soft: #f4e6e2;
  --color-math: #2f5d50;
  --color-math-soft: #e6efe9;
  --color-english: #1f4e79;
  --color-english-soft: #e6eef5;
  --color-chinese: #7a4419;
  --color-chinese-soft: #f2e6da;
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --measure: 42em;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 3rem 1.5rem 6rem;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.7;
}

main, .page {
  max-width: var(--measure);
  margin: 0 auto;
}

h1, h2, h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.3;
}

h1 {
  font-size: 1.9rem;
  margin: 0 0 0.4rem;
}

h2 {
  font-size: 1.35rem;
  margin: 2.2rem 0 0.8rem;
  border-bottom: 1px solid var(--color-rule);
  padding-bottom: 0.3rem;
}

h3 {
  font-size: 1.05rem;
  margin: 1.4rem 0 0.5rem;
}

p, li {
  font-size: 1rem;
}

.subtitle {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-soft);
  text-decoration-thickness: 2px;
}

a:hover {
  text-decoration-color: var(--color-accent);
}

.tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.tag-math { background: var(--color-math-soft); color: var(--color-math); }
.tag-english { background: var(--color-english-soft); color: var(--color-english); }
.tag-chinese { background: var(--color-chinese-soft); color: var(--color-chinese); }

.card {
  border: 1px solid var(--color-rule);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  margin: 1rem 0;
  background: #fff;
}

.callout {
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-soft);
  padding: 0.9rem 1.1rem;
  border-radius: 0 8px 8px 0;
  margin: 1.2rem 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.callout-math { border-left-color: var(--color-math); background: var(--color-math-soft); }
.callout-english { border-left-color: var(--color-english); background: var(--color-english-soft); }
.callout-chinese { border-left-color: var(--color-chinese); background: var(--color-chinese-soft); }

.source {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-muted);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-family: var(--font-sans);
  font-size: 0.92rem;
}

th, td {
  border: 1px solid var(--color-rule);
  padding: 0.5rem 0.7rem;
  text-align: left;
}

th {
  background: #f6f3ec;
}

.nav-links {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--color-rule);
  display: flex;
  justify-content: space-between;
  color: var(--color-muted);
}

/* --- Quiz widget --- */
.quiz {
  border: 1px solid var(--color-rule);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  margin: 1.2rem 0;
  background: #fbf9f4;
  font-family: var(--font-sans);
}

.quiz-question {
  font-weight: 600;
  margin-bottom: 0.7rem;
}

.quiz input[type="text"] {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  width: 100%;
  max-width: 16rem;
}

.quiz button {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 6px;
  background: var(--color-text);
  color: #fff;
  cursor: pointer;
  margin-top: 0.6rem;
  margin-right: 0.5rem;
}

.quiz button:hover {
  opacity: 0.85;
}

.quiz-feedback {
  margin-top: 0.7rem;
  font-size: 0.92rem;
  min-height: 1.4em;
}

.quiz-feedback.correct { color: #2f6d3d; }
.quiz-feedback.incorrect { color: var(--color-accent); }

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.quiz-options label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
}

/* --- Progress checklist --- */
.checklist {
  list-style: none;
  padding: 0;
  font-family: var(--font-sans);
}

.checklist li {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--color-rule);
}

.checklist .week-label {
  font-weight: 700;
  min-width: 3.2rem;
  color: var(--color-muted);
}

/* --- Self-check open question --- */
.selfcheck {
  border: 1px solid var(--color-rule);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  margin: 1.2rem 0;
  background: #fbf9f4;
  font-family: var(--font-sans);
}

.selfcheck-question {
  font-weight: 600;
  margin-bottom: 0.7rem;
}

.selfcheck-input {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  width: 100%;
  resize: vertical;
}

.selfcheck-model {
  margin-top: 0.9rem;
  padding: 0.8rem 1rem;
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 0 8px 8px 0;
  font-size: 0.92rem;
  line-height: 1.6;
}

.selfcheck-rating {
  margin-top: 0.8rem;
}

.selfcheck-rating span {
  font-size: 0.88rem;
  color: var(--color-muted);
  margin-right: 0.6rem;
}

.selfcheck button {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 6px;
  background: var(--color-text);
  color: #fff;
  cursor: pointer;
  margin-top: 0.6rem;
  margin-right: 0.5rem;
}

.selfcheck button:hover {
  opacity: 0.85;
}

.selfcheck button:disabled {
  opacity: 0.5;
  cursor: default;
}

.selfcheck-answer {
  margin-top: 0.7rem;
  font-size: 0.92rem;
  color: var(--color-muted);
  min-height: 1.4em;
}

.practice-note {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
}

/* --- Doubt box / learning record --- */
.doubt-box {
  border: 1px solid var(--color-rule);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  margin: 1.2rem 0;
  background: #fbf9f4;
  font-family: var(--font-sans);
}

.doubt-input {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  width: 100%;
  max-width: 24rem;
}

.doubt-box button,
.record-actions button {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 6px;
  background: var(--color-text);
  color: #fff;
  cursor: pointer;
  margin-top: 0.6rem;
  margin-right: 0.5rem;
}

.doubt-box button:hover,
.record-actions button:hover {
  opacity: 0.85;
}

.record-actions button.secondary {
  background: transparent;
  color: var(--color-muted);
  border: 1px solid var(--color-rule);
}

.doubt-list {
  list-style: disc;
  padding-left: 1.4rem;
  margin-top: 0.8rem;
  font-size: 0.92rem;
  color: var(--color-muted);
}