/* EnglishStart — design system */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-soft: #eef2ff;
  --accent: #f59e0b;
  --green: #10b981;
  --red: #ef4444;
  --bg: #f6f7fb;
  --card: #ffffff;
  --ink: #1f2330;
  --ink-2: #5b6172;
  --ink-3: #9aa0b4;
  --line: #eceef4;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 6px 24px rgba(31, 35, 48, 0.06);
  --shadow-lg: 0 16px 48px rgba(31, 35, 48, 0.12);
  --sidebar-w: 240px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: 15px; }

/* ---------- boot splash ---------- */
.boot-splash { height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 14px; color: var(--ink-3); }
.boot-logo { font-size: 56px; animation: float 2s ease-in-out infinite; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-10px)} }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; border: none; border-radius: 999px; padding: 11px 22px;
  font-size: 15px; font-weight: 600; background: var(--primary-soft);
  color: var(--primary-dark); transition: transform .12s, box-shadow .2s, background .2s; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--primary); color: #fff;
  box-shadow: 0 8px 20px rgba(99,102,241,.35); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--ink-2); }
.btn-ghost:hover { background: var(--line); }
.btn-block { width: 100%; }
.btn-lg { padding: 14px 30px; font-size: 16px; }
.btn-sm { padding: 7px 14px; font-size: 13px; }

/* ---------- layout ---------- */
.layout { display: flex; min-height: 100vh; }
.sidebar { width: var(--sidebar-w); background: var(--card);
  border-right: 1px solid var(--line); padding: 22px 16px;
  position: fixed; top: 0; bottom: 0; left: 0; display: flex; flex-direction: column; }
.brand { display: flex; align-items: center; gap: 10px; padding: 6px 10px 20px; }
.brand .logo { font-size: 26px; }
.brand .name { font-weight: 800; font-size: 18px; letter-spacing: .2px; }
.brand .name small { display: block; font-size: 11px; color: var(--ink-3);
  font-weight: 600; letter-spacing: 1px; }
.nav { display: flex; flex-direction: column; gap: 4px; margin-top: 6px; }
.nav-item { display: flex; align-items: center; gap: 12px; padding: 11px 14px;
  border-radius: var(--radius-sm); color: var(--ink-2); font-weight: 600; font-size: 15px;
  transition: background .15s, color .15s; }
.nav-item .ic { font-size: 18px; width: 22px; text-align: center; }
.nav-item:hover { background: var(--bg); }
.nav-item.active { background: var(--primary-soft); color: var(--primary-dark); }
.sidebar-foot { margin-top: auto; border-top: 1px solid var(--line); padding-top: 14px; }
.user-chip { display: flex; align-items: center; gap: 10px; padding: 8px 10px; }
.avatar { width: 38px; height: 38px; border-radius: 50%; flex: 0 0 38px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; }
.user-chip .uname { font-weight: 700; font-size: 14px; }
.user-chip .ulink { font-size: 12px; color: var(--ink-3); }

.main { flex: 1; margin-left: var(--sidebar-w); padding: 30px 36px 90px;
  max-width: 1080px; }
.page-head { margin-bottom: 22px; }
.page-head h1 { margin: 0; font-size: 24px; font-weight: 800; }
.page-head p { margin: 4px 0 0; color: var(--ink-2); }

/* ---------- cards ---------- */
.card { background: var(--card); border-radius: var(--radius); padding: 22px;
  box-shadow: var(--shadow); border: 1px solid var(--line); }
.card + .card { margin-top: 18px; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.section-title { font-size: 16px; font-weight: 800; margin: 0 0 14px;
  display: flex; align-items: center; gap: 8px; }
.muted { color: var(--ink-3); }
.hint { color: var(--ink-2); font-size: 14px; }

/* ---------- stat tiles ---------- */
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat .num { font-size: 28px; font-weight: 800; line-height: 1; }
.stat .lbl { font-size: 13px; color: var(--ink-3); }
.stat .ic { font-size: 22px; }

/* ---------- progress bar ---------- */
.bar { height: 9px; background: var(--line); border-radius: 999px; overflow: hidden; }
.bar > span { display: block; height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), #8b5cf6); transition: width .4s; }

/* ---------- pills / chips ---------- */
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 4px 11px;
  border-radius: 999px; font-size: 12px; font-weight: 700; background: var(--primary-soft);
  color: var(--primary-dark); }
.pill.green { background: #e7f8f1; color: #0a8a5f; }
.pill.amber { background: #fef3e2; color: #b4730d; }
.pill.gray  { background: #f0f1f5; color: var(--ink-2); }

/* ---------- today plan items ---------- */
.plan-item { display: flex; align-items: center; gap: 14px; padding: 14px;
  border: 1px solid var(--line); border-radius: var(--radius-sm); transition: border .15s, box-shadow .15s; cursor: pointer; }
.plan-item:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.plan-item .glyph { font-size: 22px; font-weight: 800; color: var(--primary-dark);
  background: var(--primary-soft); width: 50px; height: 50px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center; flex: 0 0 50px; }
.plan-item .meta { flex: 1; min-width: 0; }
.plan-item .meta .t { font-weight: 700; }
.plan-item .meta .s { font-size: 13px; color: var(--ink-3);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ---------- practice ---------- */
.practice-wrap { max-width: 720px; margin: 0 auto; }
.flash { font-size: 64px; font-weight: 800; text-align: center; color: var(--primary-dark);
  letter-spacing: 1px; margin: 6px 0; }
.flash.word { font-size: 46px; }
.flash.sentence { font-size: 30px; line-height: 1.35; }
.example-line { text-align: center; color: var(--ink-2); font-size: 18px; margin-bottom: 4px; }
.art-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 8px; }
.art-cell { background: var(--bg); border-radius: 12px; padding: 12px 14px; }
.art-cell .k { font-size: 12px; color: var(--ink-3); font-weight: 700; }
.art-cell .v { font-size: 14px; margin-top: 2px; }
.mic-btn { width: 96px; height: 96px; border-radius: 50%; border: none; font-size: 38px;
  color: #fff; background: linear-gradient(135deg, var(--primary), #8b5cf6);
  box-shadow: 0 12px 30px rgba(99,102,241,.4); transition: transform .15s; }
.mic-btn:hover { transform: scale(1.05); }
.mic-btn.recording { background: linear-gradient(135deg, #ef4444, #f97316);
  animation: pulse 1.2s infinite; }
@keyframes pulse { 0%{box-shadow:0 0 0 0 rgba(239,68,68,.5)} 70%{box-shadow:0 0 0 22px rgba(239,68,68,0)} 100%{box-shadow:0 0 0 0 rgba(239,68,68,0)} }
.score-ring { width: 120px; height: 120px; position: relative; margin: 0 auto; }
.score-ring .val { position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; }
.score-ring .val b { font-size: 30px; }
.score-ring .val span { font-size: 12px; color: var(--ink-3); }
.feedback-box { background: var(--primary-soft); border-radius: var(--radius-sm);
  padding: 16px; color: #3730a3; line-height: 1.6; }
.recognized { background: var(--bg); border-radius: 10px; padding: 10px 14px;
  font-size: 14px; color: var(--ink-2); text-align: center; }

/* ---------- syllabus ---------- */
.stage-card { cursor: pointer; }
.stage-head { display: flex; align-items: center; gap: 14px; }
.stage-head .icon { font-size: 30px; }
.stage-head .ttl { font-weight: 800; font-size: 17px; }
.stage-head .sub { font-size: 12px; color: var(--ink-3); letter-spacing: 1px; }
.item-chip { display: inline-flex; align-items: center; gap: 6px; margin: 5px;
  padding: 9px 13px; border-radius: 12px; border: 1px solid var(--line);
  background: #fff; cursor: pointer; font-weight: 700; transition: all .15s; }
.item-chip:hover { border-color: var(--primary); color: var(--primary-dark); }
.item-chip.done { background: #e7f8f1; border-color: #bdeedd; color: #0a8a5f; }
.item-chip .mini { font-size: 11px; font-weight: 600; color: var(--ink-3); }

/* ---------- badges ---------- */
.badge-card { text-align: center; padding: 20px 14px; border-radius: var(--radius);
  border: 1px solid var(--line); background: #fff; transition: transform .15s; }
.badge-card.locked { filter: grayscale(1); opacity: .5; }
.badge-card:hover { transform: translateY(-3px); }
.badge-card .bi { font-size: 40px; }
.badge-card .bt { font-weight: 800; margin-top: 6px; }
.badge-card .bd { font-size: 12px; color: var(--ink-3); margin-top: 4px; }

/* ---------- reports ---------- */
.report-md { line-height: 1.7; }
.report-md h1, .report-md h2 { font-size: 17px; margin: 16px 0 8px; }
.report-md ul { padding-left: 20px; }

/* ---------- tutor chat ---------- */
.chat-wrap { display: flex; flex-direction: column; height: calc(100vh - 200px);
  max-width: 760px; }
.chat-log { flex: 1; overflow-y: auto; padding: 6px 2px; display: flex;
  flex-direction: column; gap: 12px; }
.msg { max-width: 80%; padding: 11px 15px; border-radius: 16px; line-height: 1.6;
  white-space: pre-wrap; word-break: break-word; }
.msg.user { align-self: flex-end; background: var(--primary); color: #fff;
  border-bottom-right-radius: 5px; }
.msg.bot { align-self: flex-start; background: #fff; border: 1px solid var(--line);
  border-bottom-left-radius: 5px; }
.chat-input { display: flex; gap: 10px; margin-top: 14px; }
.chat-input input { flex: 1; }

/* ---------- forms ---------- */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 700; color: var(--ink-2);
  margin-bottom: 6px; }
.input { width: 100%; padding: 12px 14px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: #fff; transition: border .15s, box-shadow .15s; }
.input:focus { outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft); }
select.input { appearance: none; background-image:
  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239aa0b4' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center; }

/* ---------- auth ---------- */
.auth-screen { min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 20px; background: radial-gradient(1200px 600px at 50% -10%, #eef0ff 0%, var(--bg) 60%); }
.auth-card { width: 100%; max-width: 400px; }
.auth-logo { text-align: center; margin-bottom: 18px; }
.auth-logo .lg { font-size: 48px; }
.auth-logo h1 { margin: 8px 0 2px; font-size: 22px; }
.auth-logo p { margin: 0; color: var(--ink-3); font-size: 13px; }
.auth-tabs { display: flex; gap: 6px; background: var(--bg); padding: 5px;
  border-radius: 12px; margin-bottom: 18px; }
.auth-tabs button { flex: 1; border: none; background: transparent; padding: 9px;
  border-radius: 9px; font-weight: 700; color: var(--ink-2); }
.auth-tabs button.active { background: #fff; color: var(--primary-dark); box-shadow: var(--shadow); }

/* ---------- toast ---------- */
.toast-wrap { position: fixed; top: 18px; left: 50%; transform: translateX(-50%);
  z-index: 1000; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.toast { padding: 11px 18px; border-radius: 12px; background: #1f2330; color: #fff;
  font-size: 14px; font-weight: 600; box-shadow: var(--shadow-lg);
  animation: toastIn .25s ease; }
.toast.err { background: var(--red); }
.toast.ok { background: var(--green); }
@keyframes toastIn { from{opacity:0;transform:translateY(-8px)} to{opacity:1;transform:none} }

/* badge popup */
.badge-pop { position: fixed; inset: 0; background: rgba(20,22,33,.5);
  display: flex; align-items: center; justify-content: center; z-index: 1100; padding: 20px; }
.badge-pop .inner { background: #fff; border-radius: 22px; padding: 30px 34px;
  text-align: center; max-width: 320px; animation: popIn .3s ease; }
.badge-pop .bi { font-size: 64px; }
@keyframes popIn { from{transform:scale(.85);opacity:0} to{transform:scale(1);opacity:1} }

/* ---------- spinner ---------- */
.spinner { width: 18px; height: 18px; border: 2.5px solid rgba(255,255,255,.4);
  border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
.spinner.dark { border-color: var(--line); border-top-color: var(--primary); }
@keyframes spin { to { transform: rotate(360deg); } }
.center-col { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.loading-row { display: flex; align-items: center; gap: 10px; color: var(--ink-3); }

/* ---------- mobile nav ---------- */
.mobile-bar { display: none; }
.topbar { display: none; }

@media (max-width: 860px) {
  .sidebar { display: none; }
  .main { margin-left: 0; padding: 16px 16px 86px; max-width: 100%; }
  .topbar { display: flex; align-items: center; justify-content: space-between;
    padding: 14px 16px; background: var(--card); border-bottom: 1px solid var(--line);
    position: sticky; top: 0; z-index: 50; }
  .topbar .brand { padding: 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .mobile-bar { display: flex; position: fixed; bottom: 0; left: 0; right: 0;
    background: var(--card); border-top: 1px solid var(--line); z-index: 100;
    padding: 6px 4px env(safe-area-inset-bottom); justify-content: space-around; }
  .mobile-bar a { display: flex; flex-direction: column; align-items: center; gap: 2px;
    padding: 6px 8px; color: var(--ink-3); font-size: 11px; font-weight: 700; }
  .mobile-bar a.active { color: var(--primary-dark); }
  .mobile-bar a .ic { font-size: 20px; }
  .art-grid { grid-template-columns: 1fr; }
  .chat-wrap { height: calc(100vh - 230px); }
  .msg { max-width: 88%; }
}
@media (max-width: 540px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .flash { font-size: 50px; }
  .flash.sentence { font-size: 24px; }
}