/* BURGEREE English - Minimal (Apple-like) UI */

:root{
  --primary:#0071e3;
  --primary-hover:#0077ed;
  --bg:#ffffff;
  --bg-subtle:#f5f5f7;
  --text:#1d1d1f;
  --muted:#6e6e73;
  --border:rgba(0,0,0,.10);
  --shadow:0 10px 30px rgba(0,0,0,.08);
  --radius:18px;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display","Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
}

.topbar{
  position:sticky;top:0;z-index:1000;
  background:rgba(255,255,255,.8);
  backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--border);
}
.topbar-inner{
  max-width:1040px;margin:0 auto;
  padding:14px 18px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.brand{display:flex;flex-direction:column;gap:2px}
.brand-name{font-weight:600;letter-spacing:-.01em}
.brand-sub{color:var(--muted);font-size:12px}
.today-mini{color:var(--muted);font-size:13px}
.today-mini b{color:var(--text)}
.topbar-right{display:flex;align-items:center;gap:10px}
.user-btn{
  border:1px solid var(--border);
  background:var(--bg-subtle);
  color:var(--text);
  border-radius:999px;
  padding:8px 12px;
  font-size:13px;
  cursor:pointer;
  transition:all .15s ease;
}
.user-btn:hover{background:#fff;box-shadow:0 6px 18px rgba(0,0,0,.06)}

.main-container{max-width:1040px;margin:0 auto;padding:28px 18px 64px}

.hero{padding:42px 0 24px}
.hero-title{font-size:40px;line-height:1.05;letter-spacing:-.02em;margin-bottom:10px}
.hero-subtitle{color:var(--muted);font-size:16px;line-height:1.6;margin-bottom:18px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}

/* Knowledge base stats */
.kb-stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.kb-pill{
  border:1px solid var(--border);
  background:var(--bg-subtle);
  color:var(--text);
  padding:8px 12px;
  border-radius:999px;
  font-size:13px;
}
.kb-pill b{font-weight:750}

.btn-primary,.btn-secondary{
  border-radius:999px;padding:10px 16px;font-size:14px;cursor:pointer;
  border:1px solid var(--border);background:#fff;color:var(--text);
  transition:all .15s ease;
}
.btn-primary{background:var(--primary);color:#fff;border-color:transparent}
.btn-primary:hover{background:var(--primary-hover)}
.btn-secondary:hover{background:var(--bg-subtle)}

.section-title{font-size:18px;letter-spacing:-.01em;margin:28px 0 12px}

.modules-grid.minimal{display:flex;flex-wrap:wrap;gap:10px}
.module-item{display:flex;flex-direction:column;gap:6px}
.module-meta{font-size:12px;color:var(--muted);padding-left:10px}
.module-pill{
  border:1px solid var(--border);
  background:var(--bg-subtle);
  color:var(--text);
  padding:10px 14px;border-radius:999px;cursor:pointer;font-size:13px;
  transition:all .15s ease;
}
.module-pill:hover{background:#fff;box-shadow:0 6px 18px rgba(0,0,0,.06)}

.review-row{display:flex;gap:10px;flex-wrap:wrap}
.review-pill{
  border:1px solid var(--border);background:#fff;border-radius:999px;
  padding:10px 14px;cursor:pointer;color:var(--text);font-size:13px;
  box-shadow:0 6px 18px rgba(0,0,0,.06);
}
.review-pill span{margin-left:6px;color:var(--muted);font-weight:600}

/* Modal */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.35);display:none;align-items:center;justify-content:center;padding:20px;z-index:2000}
.modal.active{display:flex}
.modal-content{
  width:min(720px,100%);
  background:#fff;border-radius:var(--radius);
  box-shadow:0 30px 80px rgba(0,0,0,.22);
  padding:18px;
}
.modal-close{
  border:1px solid var(--border);
  background:var(--bg-subtle);
  width:36px;height:36px;border-radius:999px;cursor:pointer;
  float:right;
}

/* Auth modal */
.auth-modal{width:min(520px,100%)}
.auth-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px}
.auth-title{font-weight:650;letter-spacing:-.01em}
.auth-body{padding-top:6px}
.auth-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:12px 0}
.auth-row span{color:var(--muted);font-size:13px;min-width:48px}
.auth-input{
  width:100%;
  border:1px solid var(--border);
  border-radius:12px;
  padding:10px 12px;
  font-size:14px;
  background:#fff;
  outline:none;
}
.auth-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:14px}
.auth-hint{color:var(--muted);font-size:12px;line-height:1.5;margin-top:10px}

.flashcard-container{padding-top:6px}

.learn-header{display:flex;justify-content:space-between;align-items:center;margin:6px 0 12px}
.learn-meta{color:var(--muted);font-size:13px}
.learn-header-right{display:flex;align-items:center;gap:10px}
.learn-tag{border:1px solid var(--border);background:var(--bg-subtle);border-radius:999px;padding:4px 10px;font-size:12px;color:var(--muted)}

/* Voice select (minimal) */
.voice-label{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px}
.voice-label span{display:none} /* 更极简：只展示 select */
.voice-select{
  appearance:none;
  -webkit-appearance:none;
  -moz-appearance:none;
  border:1px solid var(--border);
  background:var(--bg-subtle);
  border-radius:999px;
  padding:6px 26px 6px 10px;
  font-size:12px;
  color:var(--text);
  cursor:pointer;
  outline:none;
  background-image:linear-gradient(45deg, transparent 50%, var(--muted) 50%),linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position:calc(100% - 14px) 50%, calc(100% - 9px) 50%;
  background-size:5px 5px,5px 5px;
  background-repeat:no-repeat;
}
.voice-select:hover{background-color:#fff}

.learn-card{
  border:1px solid var(--border);
  background:#fff;
  border-radius:var(--radius);
  padding:18px;
  box-shadow:var(--shadow);
}
.learn-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.learn-word{font-size:34px;font-weight:700;letter-spacing:-.02em}
.learn-phonetic{color:var(--muted);font-size:14px;margin-top:6px}
.icon-btn{
  border:1px solid var(--border);
  background:var(--bg-subtle);
  border-radius:999px;
  width:42px;height:42px;
  cursor:pointer;
  font-size:18px;
}
.icon-btn:hover{background:#fff}
.icon-btn.small{width:34px;height:34px;font-size:16px}

.learn-meaning{
  margin-top:14px;
  padding:12px 12px;
  border-radius:14px;
  background:var(--bg-subtle);
  font-size:18px;
  line-height:1.4;
}

.learn-example{
  margin-top:14px;
  display:flex;align-items:flex-start;gap:10px;
}
.learn-example-text{
  flex:1;
  color:var(--muted);
  font-size:14px;
  line-height:1.6;
}

.learn-actions{display:flex;gap:10px;margin-top:14px}
.rate-btn{
  flex:1;
  border:1px solid var(--border);
  background:#fff;
  border-radius:14px;
  padding:12px 10px;
  cursor:pointer;
  font-size:14px;
}
.rate-btn:hover{background:var(--bg-subtle)}
.rate-btn.primary{background:var(--primary);border-color:transparent;color:#fff}
.rate-btn.primary:hover{background:var(--primary-hover)}

.learn-hint{
  margin-top:10px;
  text-align:center;
  font-size:12px;
  color:var(--muted);
}

/* Toast (minimal) */
.toast-container{position:fixed;right:16px;bottom:16px;z-index:3000}
.toast{background:#fff;border:1px solid var(--border);border-radius:12px;padding:10px 12px;box-shadow:var(--shadow);color:var(--text)}