/* 伤寒日课 · 宣纸墨色主题 */
:root {
  --paper: #f7f3e8;
  --paper-2: #fbf8f0;
  --ink: #2b2b2b;
  --ink-2: #5b564d;
  --ink-3: #8c867a;
  --line: #ddd4c0;
  --cinnabar: #a63f2e;
  --cinnabar-soft: rgba(166, 63, 46, 0.08);
  --jade: #4a7a5e;
  --shadow: 0 2px 10px rgba(90, 70, 40, 0.08);
  --radius: 16px;
  --tab-h: 58px;
  --fs-clause: 19px;
  color-scheme: light;
}

html[data-font='s'] { --fs-clause: 17px; }
html[data-font='l'] { --fs-clause: 22px; }

html[data-theme='dark'] {
  --paper: #1c1a17;
  --paper-2: #24211d;
  --ink: #ece6da;
  --ink-2: #bdb5a5;
  --ink-3: #8a8377;
  --line: #3a352d;
  --cinnabar: #d0614a;
  --cinnabar-soft: rgba(208, 97, 74, 0.12);
  --jade: #6fae89;
  --shadow: 0 2px 14px rgba(0, 0, 0, 0.4);
  color-scheme: dark;
}

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

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  background-image:
    radial-gradient(circle at 18% 12%, rgba(166, 63, 46, 0.035), transparent 42%),
    radial-gradient(circle at 82% 78%, rgba(74, 122, 94, 0.035), transparent 46%);
}

#app { max-width: 560px; margin: 0 auto; padding: 0 16px calc(var(--tab-h) + env(safe-area-inset-bottom) + 20px); }

.topbar {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 18px 2px 10px;
}
.brand { font-family: "Songti SC", "STSong", "SimSun", serif; font-size: 20px; letter-spacing: 2px; }
.brand small { display: block; font-size: 11px; color: var(--ink-3); letter-spacing: 1px; margin-top: 2px; }
.topbar .date { font-size: 12px; color: var(--ink-3); }

.card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 14px;
}

.hero { text-align: center; padding: 22px 16px 18px; }
.hero .streak { font-family: "Songti SC", "STSong", serif; font-size: 54px; line-height: 1; color: var(--cinnabar); }
.hero .streak small { font-size: 14px; color: var(--ink-2); margin-left: 6px; }
.hero .sub { color: var(--ink-3); font-size: 12px; margin-top: 8px; letter-spacing: 1px; }

.ring { position: relative; width: 132px; height: 132px; margin: 6px auto 12px; }
.ring svg { transform: rotate(-90deg); }
.ring .num { position: absolute; inset: 0; display: grid; place-items: center; font-size: 28px; font-weight: 600; }

.row { display: flex; gap: 10px; align-items: center; }
.row.between { justify-content: space-between; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }

.btn {
  appearance: none; border: 1px solid var(--line); background: var(--paper-2);
  color: var(--ink); font-size: 15px; padding: 12px 16px; border-radius: 12px;
  cursor: pointer; font-family: inherit; transition: transform 0.08s ease, background 0.15s;
}
.btn:active { transform: scale(0.98); }
.btn.primary { background: var(--cinnabar); border-color: var(--cinnabar); color: #fff; }
.btn.ghost { background: transparent; }
.btn.block { display: block; width: 100%; text-align: center; }
.btn.sm { padding: 8px 12px; font-size: 13px; border-radius: 10px; }
.btn[disabled] { opacity: 0.45; pointer-events: none; }

.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; height: calc(var(--tab-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  display: flex; z-index: 30;
}
.tabbar a {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; color: var(--ink-3); text-decoration: none; font-size: 11px; letter-spacing: 1px;
}
.tabbar a.active { color: var(--cinnabar); }
.tabbar svg { width: 21px; height: 21px; }

.clause-title { font-size: 12px; color: var(--ink-3); letter-spacing: 1px; margin-bottom: 10px; display: flex; justify-content: space-between; }
.clause-text {
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: var(--fs-clause); line-height: 1.95; letter-spacing: 0.5px; white-space: pre-wrap;
}
.clause-text .blank {
  color: var(--cinnabar); border-bottom: 2px solid var(--cinnabar); padding: 0 2px; font-weight: 600;
}

.study-card { min-height: 58vh; display: flex; flex-direction: column; justify-content: center; }
.study-card .clause-text { text-align: justify; }

.rate { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 18px; }
.rate .btn { padding: 14px 6px; font-size: 14px; }
.rate .again { border-color: var(--cinnabar); color: var(--cinnabar); }
.rate .good { border-color: var(--jade); color: var(--jade); }

.options { display: grid; gap: 10px; margin-top: 18px; }
.option {
  padding: 14px 16px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--paper-2); font-size: 16px; text-align: left; cursor: pointer;
  font-family: inherit; color: var(--ink); transition: all 0.15s;
}
.option.correct { border-color: var(--jade); background: rgba(74, 122, 94, 0.1); }
.option.wrong { border-color: var(--cinnabar); background: var(--cinnabar-soft); }
.option[disabled] { pointer-events: none; }

.answer-input {
  width: 100%; padding: 14px 16px; font-size: 18px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--paper-2); color: var(--ink); font-family: inherit;
  margin-top: 16px;
}
.answer-input:focus { outline: 2px solid var(--cinnabar-soft); border-color: var(--cinnabar); }

.feedback { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line); font-size: 14px; }
.feedback .ok { color: var(--jade); font-weight: 600; }
.feedback .bad { color: var(--cinnabar); font-weight: 600; }
.feedback .full { margin-top: 10px; font-family: "Songti SC", "STSong", serif; line-height: 1.9; font-size: 15px; color: var(--ink-2); }

.progressbar { height: 6px; background: var(--line); border-radius: 6px; overflow: hidden; }
.progressbar > i { display: block; height: 100%; background: var(--cinnabar); transition: width 0.3s; }

.heat { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 1fr); gap: 3px; overflow-x: auto; padding: 4px 0; }
.heat i { width: 12px; height: 12px; border-radius: 3px; background: var(--line); display: block; }
.heat i[data-l='1'] { background: color-mix(in srgb, var(--cinnabar) 22%, var(--line)); }
.heat i[data-l='2'] { background: color-mix(in srgb, var(--cinnabar) 42%, var(--line)); }
.heat i[data-l='3'] { background: color-mix(in srgb, var(--cinnabar) 66%, var(--line)); }
.heat i[data-l='4'] { background: var(--cinnabar); }
.heat i.future { opacity: 0.25; }
.heat i.today { outline: 1px solid var(--ink-3); outline-offset: 1px; }

.stat-num { font-family: "Songti SC", "STSong", serif; font-size: 26px; }
.stat-label { font-size: 11px; color: var(--ink-3); margin-top: 4px; letter-spacing: 1px; }

.chapter { margin-bottom: 10px; }
.chapter .row { font-size: 13px; color: var(--ink-2); margin-bottom: 6px; }

.list-item {
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  padding: 12px 2px; border-bottom: 1px solid var(--line); font-size: 14px;
}
.list-item:last-child { border-bottom: none; }

.seal {
  width: 92px; height: 92px; border: 3px solid var(--cinnabar); border-radius: 8px;
  color: var(--cinnabar); display: grid; place-items: center; text-align: center;
  font-family: "Songti SC", "STSong", serif; font-size: 15px; line-height: 1.2;
  letter-spacing: 2px; transform: rotate(-6deg); opacity: 0.92;
}
.seal.big { transform: rotate(-8deg) scale(1.6); animation: stamp 0.5s ease-out; }
@keyframes stamp {
  0% { transform: rotate(-8deg) scale(2.6); opacity: 0; }
  60% { transform: rotate(-8deg) scale(1.35); opacity: 1; }
  100% { transform: rotate(-8deg) scale(1.6); opacity: 0.92; }
}

.overlay {
  position: fixed; inset: 0; background: var(--paper); z-index: 40;
  overflow-y: auto; padding: 18px 16px calc(30px + env(safe-area-inset-bottom));
}
.overlay .inner { max-width: 560px; margin: 0 auto; }
.overlay .close { position: sticky; top: 0; display: flex; justify-content: flex-end; padding: 4px 0 8px; background: var(--paper); z-index: 2; }

.empty { text-align: center; color: var(--ink-3); font-size: 13px; padding: 30px 0; }

label.field { display: block; margin: 14px 0; font-size: 13px; color: var(--ink-2); }
label.field .row { margin-top: 8px; }
input[type='time'], select, input[type='number'] {
  font-family: inherit; font-size: 15px; padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--paper-2); color: var(--ink);
}
input[type='range'] { width: 100%; accent-color: var(--cinnabar); }

.hint { font-size: 12px; color: var(--ink-3); line-height: 1.7; }
.section-title { font-size: 12px; letter-spacing: 2px; color: var(--ink-3); margin: 20px 0 10px; }
.divider { height: 1px; background: var(--line); margin: 16px 0; }

.toast {
  position: fixed; left: 50%; bottom: calc(var(--tab-h) + 24px); transform: translateX(-50%) translateY(20px);
  background: rgba(43, 43, 43, 0.92); color: #f7f3e8; padding: 10px 18px; border-radius: 20px;
  font-size: 13px; opacity: 0; pointer-events: none; transition: all 0.25s; z-index: 60; max-width: 80vw; text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.toggle { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.toggle:last-child { border-bottom: none; }
.switch { width: 46px; height: 27px; border-radius: 20px; background: var(--line); position: relative; cursor: pointer; transition: background 0.2s; flex: none; }
.switch::after { content: ''; position: absolute; top: 3px; left: 3px; width: 21px; height: 21px; border-radius: 50%; background: #fff; transition: transform 0.2s; box-shadow: 0 1px 3px rgba(0,0,0,0.2); }
.switch.on { background: var(--cinnabar); }
.switch.on::after { transform: translateX(19px); }

html[data-anim='off'] * { animation: none !important; transition: none !important; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- V2：三轮步进、批次选择、默写对照 ---------- */
.stepper { display: flex; gap: 8px; margin: 14px 0 0; }
.stepper .step {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 6px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--paper-2); color: var(--ink-3); font-size: 12px;
}
.stepper .step b {
  width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center;
  background: var(--line); color: var(--ink-2); font-size: 12px; font-weight: 600;
}
.stepper .step.on { border-color: var(--cinnabar); color: var(--cinnabar); background: var(--cinnabar-soft); }
.stepper .step.on b { background: var(--cinnabar); color: #fff; }
.stepper .step.done { border-color: color-mix(in srgb, var(--jade) 45%, var(--line)); color: var(--jade); }
.stepper .step.done b { background: var(--jade); color: #fff; }

.batch-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--line); background: var(--paper-2); color: var(--ink-2);
  border-radius: 999px; padding: 9px 16px; font-size: 14px; font-family: inherit; cursor: pointer;
}
.chip.on { border-color: var(--cinnabar); color: var(--cinnabar); background: var(--cinnabar-soft); }
.chip:active { transform: scale(0.97); }

#customSize { width: 96px; text-align: center; }

textarea.recall {
  resize: vertical; min-height: 150px; line-height: 1.95;
  font-family: "Songti SC", "STSong", "SimSun", serif; font-size: 17px;
}

.diff {
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 17px; line-height: 2.1; background: var(--paper);
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px;
}
.diff del { color: var(--cinnabar); text-decoration: underline; text-decoration-style: dashed; }
.diff ins { color: var(--ink-3); text-decoration: line-through; }

/* ---------- V3：统计页与要点 ---------- */
.today-card .motto {
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 20px; letter-spacing: 1px; margin-top: 2px;
}
.today-card .quote {
  margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--line);
  font-size: 13px; color: var(--ink-3); font-family: "Songti SC", "STSong", serif;
}
.today-card .quote span { opacity: 0.8; }

.round-dots { display: flex; gap: 6px; }
.round-dots .dot {
  width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  font-size: 12px; border: 1px solid var(--line); color: var(--ink-3); background: var(--paper-2);
}
.round-dots .dot.done { background: var(--jade); border-color: var(--jade); color: #fff; }
.round-dots .dot.current {
  border-color: var(--cinnabar); color: var(--cinnabar);
  background: var(--cinnabar-soft); box-shadow: 0 0 0 3px var(--cinnabar-soft);
}

.bars { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; align-items: end; }
.bar-wrap { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.bar {
  width: 100%; max-width: 26px; border-radius: 6px 6px 3px 3px;
  background: color-mix(in srgb, var(--cinnabar) 35%, var(--line));
  transition: height 0.3s;
}
.bar.today { background: var(--cinnabar); }
.bar-num { font-size: 11px; color: var(--ink-3); }
.bar-label { font-size: 10px; color: var(--ink-3); }

details.collapse summary {
  cursor: pointer; font-weight: 600; display: flex; align-items: center; gap: 8px; list-style: none;
}
details.collapse summary::-webkit-details-marker { display: none; }
details.collapse summary .hint { margin-left: auto; font-weight: 400; }
details.collapse summary::after { content: '展开'; font-size: 11px; color: var(--ink-3); font-weight: 400; }
details.collapse[open] summary::after { content: '收起'; }

.points { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.point-chip {
  font-size: 12px; padding: 4px 10px; border-radius: 999px;
  background: var(--cinnabar-soft); color: var(--cinnabar);
  font-family: "Songti SC", "STSong", serif;
}

/* ---------- V4：一屏多空 + 记忆阶段 ---------- */
.blank-row {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 0; border-bottom: 1px dashed var(--line);
}
.blank-row:last-child { border-bottom: none; }
.blank-idx { color: var(--cinnabar); font-weight: 600; width: 18px; flex: none; }
.blank-input {
  font-family: inherit; font-size: 16px; padding: 8px 10px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink);
  min-width: 5em; flex: none;
}
.blank-input:focus { outline: 2px solid var(--cinnabar-soft); border-color: var(--cinnabar); }
.blank-tag { font-size: 11px; color: var(--ink-3); white-space: nowrap; }
.blank-ans { font-size: 12px; color: var(--ink-3); margin-left: auto; text-align: right; }
.blank-row.ok .blank-input { border-color: var(--jade); background: rgba(74, 122, 94, 0.08); }
.blank-row.ok .blank-ans { color: var(--jade); }
.blank-row.bad .blank-input { border-color: var(--cinnabar); background: var(--cinnabar-soft); }
.blank-row.bad .blank-ans { color: var(--cinnabar); }

.stage-bars { display: grid; grid-template-columns: repeat(10, 1fr); gap: 4px; }
.stage-cell {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 6px 0; border-radius: 8px; background: var(--paper); border: 1px solid var(--line);
}
.stage-num { font-size: 13px; color: var(--ink); font-weight: 600; }
.stage-label { font-size: 10px; color: var(--ink-3); }