/* 英语句子练习 · 新模板：米白纸面底 + 深青绿主色 + 暖橙点缀 */
:root {
  --bg: #FAF6EF;
  --card: #FFFFFF;
  --ink: #22312E;
  --muted: #7A8A85;
  --teal: #0F766E;
  --teal-dark: #0B5A54;
  --teal-soft: #E3F2EF;
  --orange: #F59E0B;
  --orange-soft: #FEF3D8;
  --red: #DC2626;
  --red-soft: #FDECEC;
  --green-soft: #E7F6EC;
  --line: #EAE2D3;
  --radius: 20px;
  --shadow: 0 6px 24px rgba(34, 49, 46, .07);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--ink);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  padding-bottom: 84px;
}
button { font-family: inherit; cursor: pointer; }
input, textarea { font-family: inherit; }

.topbar { position: sticky; top: 0; z-index: 30; background: rgba(250,246,239,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar-inner { max-width: 880px; margin: 0 auto; padding: 12px 16px; display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: 800; font-size: 19px; }
.user-area { display: flex; gap: 8px; align-items: center; font-size: 14px; }
.user-chip { background: var(--teal-soft); color: var(--teal-dark); padding: 6px 12px; border-radius: 999px; font-weight: 600; }

.app { max-width: 880px; margin: 0 auto; padding: 16px; }
h1 { font-size: 24px; margin: 6px 0 4px; }
h2 { font-size: 19px; margin: 22px 0 10px; }
h3 { margin: 0 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.err { color: var(--red); font-size: 14px; min-height: 20px; }

.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; margin-bottom: 14px; border: 1px solid var(--line); }
.card.clickable { cursor: pointer; transition: transform .08s; }
.card.clickable:active { transform: scale(.99); }
.row { display: flex; align-items: center; gap: 12px; }
.grow { flex: 1; }
.big-icon { font-size: 30px; }
.card-title { font-weight: 700; font-size: 17px; }
.card-sub { color: var(--muted); font-size: 13px; margin-top: 2px; }

.btn { border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 14px; padding: 10px 18px; font-size: 15px; font-weight: 600; }
.btn.primary { background: var(--teal); border-color: var(--teal); color: #fff; }
.btn.primary:active { background: var(--teal-dark); }
.btn.orange { background: var(--orange); border-color: var(--orange); color: #fff; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--teal); }
.btn.big { width: 100%; padding: 14px; font-size: 16px; margin-top: 8px; }
.btn:disabled { opacity: .45; cursor: default; }
.btn.small { padding: 6px 12px; font-size: 13px; border-radius: 10px; }

.progressbar { height: 10px; background: var(--teal-soft); border-radius: 999px; overflow: hidden; margin-top: 10px; }
.progressbar > div { height: 100%; background: var(--teal); border-radius: 999px; transition: width .3s; }
.ringwrap { display: flex; align-items: center; gap: 16px; }
.ring { width: 84px; height: 84px; border-radius: 50%; display: grid; place-items: center; font-weight: 800; font-size: 18px; color: var(--teal-dark); flex-shrink: 0; }

.hero { background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%); color: #fff; border: none; }
.hero .card-sub { color: rgba(255,255,255,.75); }
.hero .progressbar { background: rgba(255,255,255,.25); }
.hero .progressbar > div { background: var(--orange); }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }

.bottomnav { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; background: var(--card); border-top: 1px solid var(--line); display: flex; padding-bottom: env(safe-area-inset-bottom); }
.navbtn { flex: 1; background: none; border: none; padding: 8px 0 10px; font-size: 12px; color: var(--muted); display: flex; flex-direction: column; align-items: center; gap: 2px; }
.navbtn span { font-size: 20px; }
.navbtn.active { color: var(--teal); font-weight: 700; }

.tag { display: inline-block; font-size: 12px; padding: 2px 9px; border-radius: 999px; background: var(--teal-soft); color: var(--teal-dark); font-weight: 600; }
.tag.orange { background: var(--orange-soft); color: #92600A; }
.tag.done { background: var(--teal); color: #fff; }
.tag.ref { background: #EFEAE0; color: var(--muted); }

/* 句子详情与注释 */
.en-big { font-size: 23px; font-weight: 700; line-height: 1.45; }
.en-big .w, .tappable .w { cursor: pointer; border-bottom: 1px dotted var(--teal); }
.zh { font-size: 16px; color: var(--ink); margin-top: 6px; }
.anno { background: var(--teal-soft); border-radius: 14px; padding: 12px 14px; margin-top: 12px; font-size: 14px; line-height: 1.7; }
.anno .blk { display: inline-block; background: #fff; border: 1.5px dashed #B9CFC9; border-radius: 9px; padding: 1px 8px; margin: 2px 2px; }
.anno .blk.core { background: var(--teal); border: 1.5px solid var(--teal); color: #fff; font-weight: 700; }
.anno .blk-note { color: var(--teal-dark); font-size: 12px; }
.modegrid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 6px; }
.modebtn { text-align: left; background: var(--card); border: 1.5px solid var(--line); border-radius: 16px; padding: 14px; font-size: 15px; font-weight: 700; }
.modebtn .sub { display: block; font-weight: 400; font-size: 12px; color: var(--muted); margin-top: 3px; }
.modebtn.done { border-color: var(--teal); background: var(--teal-soft); }
.note-box { background: #FFFDF6; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; font-size: 14px; line-height: 1.75; margin-top: 10px; }
.wrong-box { border-radius: 14px; padding: 12px 14px; font-size: 15px; line-height: 1.7; margin-top: 10px; }
.wrong-box .bad { background: var(--red-soft); color: var(--red); border-radius: 10px; padding: 8px 10px; }
.wrong-box .good { background: var(--green-soft); color: #166534; border-radius: 10px; padding: 8px 10px; margin-top: 8px; }

/* 练习 */
.practice-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
textarea.answer, input.answer { width: 100%; border: 1.5px solid var(--line); border-radius: 14px; padding: 13px; font-size: 17px; background: #fff; outline: none; }
textarea.answer:focus, input.answer:focus { border-color: var(--teal); }
.feedback { border-radius: 14px; padding: 13px 15px; margin-top: 12px; font-size: 15px; line-height: 1.7; display: none; }
.feedback.show { display: block; }
.feedback.ok { background: var(--green-soft); color: #166534; }
.feedback.no { background: var(--red-soft); color: #7F1D1D; }
.feedback.info { background: var(--orange-soft); color: #92600A; }
.wordbank { display: flex; flex-wrap: wrap; gap: 9px; margin: 12px 0; }
.chip { border: 1.5px solid var(--teal); color: var(--teal-dark); background: #fff; border-radius: 12px; padding: 9px 14px; font-size: 16px; font-weight: 600; }
.chip.used { opacity: .25; pointer-events: none; }
.built-line { min-height: 52px; border: 1.5px dashed #B9CFC9; border-radius: 14px; padding: 10px 12px; font-size: 17px; background: #fff; cursor: pointer; }
.optlist { display: flex; flex-direction: column; gap: 9px; margin-top: 10px; }
.optbtn { text-align: left; border: 1.5px solid var(--line); background: #fff; border-radius: 14px; padding: 12px 14px; font-size: 16px; }
.optbtn.picked { border-color: var(--teal); background: var(--teal-soft); }
.blank { display: inline-block; min-width: 74px; border-bottom: 3px solid var(--orange); color: var(--orange); font-weight: 800; padding: 0 6px; text-align: center; }
.stageflow { display: flex; gap: 6px; margin: 10px 0; }
.stageflow div { flex: 1; text-align: center; font-size: 12px; padding: 7px 2px; border-radius: 9px; background: #EFEAE0; color: var(--muted); }
.stageflow div.on { background: var(--teal); color: #fff; font-weight: 700; }
.btnrow { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.btnrow .btn { flex: 1; }

/* 弹窗 */
.modal { position: fixed; inset: 0; z-index: 50; background: rgba(34,49,46,.45); display: flex; align-items: flex-end; justify-content: center; }
.modal.hidden { display: none; }
.modal-card { background: var(--card); width: 100%; max-width: 520px; max-height: 88vh; overflow-y: auto; border-radius: 26px 26px 0 0; padding: 24px 20px calc(20px + env(safe-area-inset-bottom)); position: relative; animation: up .18s ease-out; }
@media (min-width: 640px) { .modal { align-items: center; } .modal-card { border-radius: 26px; } }
@keyframes up { from { transform: translateY(16px); opacity: .6; } to { transform: none; opacity: 1; } }
.modal-card label { display: block; font-size: 14px; font-weight: 600; margin-top: 14px; }
.modal-card label input { width: 100%; margin-top: 6px; border: 1.5px solid var(--line); border-radius: 12px; padding: 12px; font-size: 16px; outline: none; }
.modal-card label input:focus { border-color: var(--teal); }
.modal-x { position: absolute; right: 14px; top: 12px; border: none; background: #EFEAE0; width: 32px; height: 32px; border-radius: 50%; font-size: 14px; }
.word-card .phonetic { display: inline-block; background: var(--teal-soft); color: var(--teal-dark); border-radius: 999px; padding: 3px 12px; font-size: 15px; margin: 4px 0 8px; }
.word-card .pos { color: var(--orange); font-weight: 700; font-size: 13px; }
.segrow { display: flex; gap: 8px; margin: 14px 0; }
.segrow button { flex: 1; border: 1.5px solid var(--line); background: #fff; border-radius: 12px; padding: 11px 0; font-size: 15px; font-weight: 600; }
.segrow button.on { border-color: var(--teal); background: var(--teal-soft); color: var(--teal-dark); }
.levelrow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 10px; }
.levelbtn { border: 1.5px solid var(--line); background: #fff; border-radius: 14px; padding: 11px 4px; font-size: 13px; font-weight: 700; text-align: center; }
.levelbtn .sub { display: block; font-size: 11px; font-weight: 400; color: var(--muted); margin-top: 2px; }
.levelbtn.done { border-color: var(--teal); background: var(--teal-soft); color: var(--teal-dark); }
.search { width: 100%; border: 1.5px solid var(--line); border-radius: 14px; padding: 12px 14px; font-size: 15px; outline: none; background: #fff; margin-bottom: 12px; }
.search:focus { border-color: var(--teal); }
/* 返回按钮：手机上点按区域加大，避免点到边上没反应 */
#back { min-height: 40px; min-width: 76px; padding: 8px 14px; font-size: 14px; touch-action: manipulation; position: relative; z-index: 1; }