/* ============================================================
   词汇学习系统 · Components
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--g50);
  color: var(--g900);
  font-size: 15px;
  line-height: 1.6;
  display: flex;
  min-height: 100vh;
}

/* ── Layout ─────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--navy);
  min-height: 100vh;
  position: fixed;
  left: 0; top: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform .25s;
}

.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  height: var(--topbar-h);
  background: var(--white);
  border-bottom: 1px solid var(--g300);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--content-pad);
  position: sticky;
  top: 0;
  z-index: 50;
}

.page-content {
  padding: var(--content-pad);
  flex: 1;
  transition: padding .25s;
}

/* ── Zen Mode Layout ────────────────────────────────────── */
body.zen-mode .sidebar {
  transform: translateX(-100%);
}
body.zen-mode .main {
  margin-left: 0;
  transition: margin-left .25s;
}
body.zen-mode .topbar {
  display: none;
}
body.zen-mode .page-content {
  padding: 40px var(--content-pad);
  display: flex;
  flex-direction: column;
  /*justify-content: center;*/
  justify-content: flex-start;  /* 改为顶部对齐 */
  min-height: 100vh;
}
body.zen-mode .page-content > .page-tab {
  width: 100%;
  margin: auto;
}
body.zen-mode .review-layout {
  grid-template-columns: 1fr;
  max-width: 800px;
  width: 100%;
}
body.zen-mode .review-panel {
  display: none;
}
body:not(.zen-mode) .main {
  transition: margin-left .25s;
}

/* Zen exit button */
.zen-exit-btn {
  display: none;
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 1000;
  background: var(--g900);
  color: #fff;
  border: none;
  border-radius: 99px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all .2s;
  opacity: 0.5;
}
.zen-exit-btn:hover {
  opacity: 1;
  transform: scale(1.05);
}
body.zen-mode .zen-exit-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ── Sidebar ────────────────────────────────────────────── */
.sb-logo {
  padding: 24px 20px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sb-logo h1 {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  letter-spacing: .3px;
}
.sb-logo p { font-size: 11px; color: rgba(255,255,255,.35); margin-top: 2px; }

.sb-nav { list-style: none; padding: 12px 8px; flex: 1; overflow-y: auto; }
.sb-section {
  font-size: 10px;
  font-weight: 700;
  color: rgba(255,255,255,.28);
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 14px 12px 4px;
}
.sb-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: none;
  background: none;
  color: rgba(255,255,255,.55);
  border-radius: var(--r);
  cursor: pointer;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  transition: all .15s;
  text-align: left;
  margin-bottom: 2px;
}
.sb-btn:hover { background: rgba(255,255,255,.07); color: #fff; }
.sb-btn.active { background: var(--blue); color: #fff; }
.sb-icon { font-size: 15px; width: 20px; text-align: center; flex-shrink: 0; }

.sb-footer {
  padding: 14px 16px;
  border-top: 1px solid rgba(255,255,255,.08);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sb-stat {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
}
.sb-stat-l { color: rgba(255,255,255,.38); }
.sb-stat-v { color: #fff; font-weight: 700; }

/* ── Cards ──────────────────────────────────────────────── */
.card {
  background: var(--white);
  border-radius: var(--r-lg);
  padding: 22px 24px;
  box-shadow: var(--shadow);
}

.card-blue  { background: var(--blue); color: #fff; }
.card-navy  { background: var(--navy); color: #fff; }
.card-green { background: var(--green-l); border: 1px solid #97c459; }
.card-red   { background: var(--red-l);   border: 1px solid #f09595; }
.card-amber { background: var(--amber-l); border: 1px solid #fac775; }
.card-purple{ background: var(--purple-l);border: 1px solid #afa9ec; }

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border: 1px solid var(--g300);
  border-radius: var(--r);
  background: var(--white);
  color: var(--g700);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
}
.btn:hover   { background: var(--g100); border-color: var(--g500); }
.btn:active  { transform: scale(.97); }

.btn-primary { background: var(--blue);  color: #fff; border-color: var(--blue); }
.btn-primary:hover { background: var(--blue-mid); border-color: var(--blue-mid); }

.btn-green   { background: var(--green); color: #fff; border-color: var(--green); }
.btn-red     { background: var(--red);   color: #fff; border-color: var(--red); }
.btn-amber   { background: var(--amber); color: #fff; border-color: var(--amber); }
.btn-navy    { background: var(--navy);  color: #fff; border-color: var(--navy); }

.btn-sm  { padding: 5px 12px; font-size: 12px; border-radius: var(--r-sm); }
.btn-lg  { padding: 13px 28px; font-size: 16px; font-weight: 600; }
.btn-full{ width: 100%; justify-content: center; }

/* ── Rating Buttons (Review) ────────────────────────────── */
.rate-btns {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}
.rate-btn {
  padding: 14px 8px;
  border-radius: var(--r-lg);
  border: 1.5px solid;
  cursor: pointer;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  transition: all .15s;
  text-align: center;
}
.rate-btn:active { transform: scale(.97); }
.rate-btn-forget { background: var(--red-l);   border-color: #f09595; color: #791f1f; }
.rate-btn-vague  { background: var(--amber-l); border-color: #fac775; color: #633806; }
.rate-btn-know   { background: var(--green-l); border-color: #97c459; color: #173404; }
.rate-btn sub    { display: block; font-size: 11px; font-weight: 400; opacity: .7; margin-top: 2px; }

/* ── Progress Bar ───────────────────────────────────────── */
.prog-wrap { background: var(--g300); border-radius: 99px; overflow: hidden; }
.prog-fill { height: 100%; border-radius: 99px; transition: width .4s cubic-bezier(.4,0,.2,1); }

/* ── Badges / Pills ─────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}
.badge-blue   { background: var(--blue-l);   color: #0c447c; }
.badge-green  { background: var(--green-l);  color: #173404; }
.badge-red    { background: var(--red-l);    color: #791f1f; }
.badge-amber  { background: var(--amber-l);  color: #633806; }
.badge-purple { background: var(--purple-l); color: #26215c; }
.badge-gray   { background: var(--g100);     color: var(--g700); }

/* ── Tag (word relation chip) ───────────────────────────── */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 13px;
  cursor: pointer;
  transition: opacity .15s;
  margin: 2px;
}
.tag:hover { opacity: .8; }
.tag-blue  { background: var(--blue-l); color: #0c447c; border: 1px solid #85b7eb; }
.tag-amber { background: var(--amber-l); color: #633806; border: 1px solid #fac775; }
.tag-red   { background: var(--red-l); color: #791f1f; border: 1px solid #f09595; }

/* ── Word Hero ──────────────────────────────────────────── */
.word-hero {
  background: var(--white);
  border-radius: var(--r-xl);
  padding: 44px 40px 36px;
  box-shadow: var(--shadow-md);
}
.word-main      { font-size: 56px; font-weight: 700; color: #042c53; line-height: 1; letter-spacing: -1px; }
.word-phonetic  { font-size: 18px; color: var(--g500); margin-top: 8px; font-style: italic; }
.word-pos       { font-size: 12px; background: var(--g100); color: var(--g500); padding: 2px 8px; border-radius: var(--r-sm); }
.word-meaning   { font-size: 26px; font-weight: 500; color: var(--g900); }
.word-example   { font-size: 16px; line-height: 1.9; color: var(--g900); }
.word-example-hl{ color: var(--blue); font-weight: 600; border-bottom: 2px solid var(--blue-l); }
.word-example-cn{ font-size: 13px; color: var(--g500); margin-top: 6px; }

/* ── Info Panel ─────────────────────────────────────────── */
.info-panel-section {
  background: var(--white);
  border-radius: var(--r-lg);
  padding: 16px 18px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}
.info-panel-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .6px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

/* ── Speaker Button ─────────────────────────────────────── */
.speak-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--blue-l);
  background: var(--blue-p);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .15s;
  flex-shrink: 0;
}
.speak-btn:hover { background: var(--blue-l); }
.speak-btn svg   { width: 17px; height: 17px; }

.speak-inline {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--g500);
  background: var(--g100);
  border: 1px solid var(--g300);
  border-radius: var(--r-sm);
  padding: 4px 10px;
  cursor: pointer;
  transition: all .15s;
}
.speak-inline:hover { background: var(--blue-p); color: var(--blue); border-color: var(--blue-l); }

/* ── Notification Toast ─────────────────────────────────── */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  padding: 10px 24px;
  border-radius: 99px;
  font-size: 14px;
  font-weight: 600;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: all .25s;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast-green { background: var(--green); color: #fff; }
.toast-red   { background: var(--red);   color: #fff; }
.toast-blue  { background: var(--blue);  color: #fff; }

/* ── Grid Helpers ───────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit,minmax(200px,1fr)); gap: 14px; }

/* ── Reading highlight ──────────────────────────────────── */
.hl-word {
  background: #fff3cd;
  border-bottom: 2px solid var(--amber);
  border-radius: 3px;
  padding: 0 2px;
  cursor: pointer;
  transition: background .15s;
}
.hl-word:hover { background: #ffe08a; }
.hl-word.known { background: #d5f5e3; border-bottom-color: var(--green); }

/* ── Form Elements ──────────────────────────────────────── */
input[type=text], input[type=email], textarea, select {
  width: 100%;
  padding: 9px 14px;
  border: 1px solid var(--g300);
  border-radius: var(--r);
  font-family: var(--font);
  font-size: 14px;
  color: var(--g900);
  background: var(--white);
  transition: border-color .15s;
  outline: none;
}
input:focus, textarea:focus, select:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(26,111,196,.12); }
textarea { resize: vertical; min-height: 100px; line-height: 1.6; }

/* ── Divider ─────────────────────────────────────────────── */
.divider { border: none; border-top: 1px solid var(--g300); margin: 18px 0; }

/* ── Screen toggle ──────────────────────────────────────── */
.screen { display: none; }
.screen.active { display: block; }