/* ============ 星海信号 · 深空主题样式 ============ */
:root {
  --bg: #060918;
  --bg2: #0b1026;
  --panel: rgba(18, 24, 52, 0.72);
  --panel-border: rgba(120, 160, 255, 0.18);
  --text: #e8ecff;
  --text-dim: #9aa6d0;
  --accent: #4dd6ff;
  --accent2: #a78bff;
  --gold: #ffd76e;
  --word: #7fe3ff;
  --word-underline: rgba(77, 214, 255, 0.45);
  --radius: 16px;
  --serif: "Georgia", "Songti SC", "Noto Serif SC", serif;
  --sans: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: radial-gradient(ellipse at 20% -10%, #14204d 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
  overflow-x: hidden;
}

#starfield {
  position: fixed; inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ---------- 玻璃卡片 ---------- */
.glass {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
}

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 28px;
  background: rgba(6, 9, 24, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--panel-border);
}

.logo { display: flex; align-items: center; gap: 12px; cursor: pointer; }
.logo-icon {
  font-size: 26px; color: var(--accent);
  filter: drop-shadow(0 0 8px rgba(77, 214, 255, 0.8));
}
.logo-text { display: flex; flex-direction: column; line-height: 1.25; }
.logo-en { font-family: var(--serif); font-size: 17px; letter-spacing: 1px; }
.logo-cn { font-size: 12px; color: var(--text-dim); }

.nav-tabs { display: flex; gap: 8px; }
.nav-tab {
  background: transparent; border: 1px solid transparent;
  color: var(--text-dim); padding: 8px 18px; border-radius: 999px;
  font-size: 14px; cursor: pointer; transition: all .25s;
}
.nav-tab:hover { color: var(--text); }
.nav-tab.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(77,214,255,.18), rgba(167,139,255,.18));
  border-color: rgba(77, 214, 255, 0.4);
}

/* ---------- 主区 ---------- */
main {
  position: relative; z-index: 1;
  max-width: 980px; margin: 0 auto;
  padding: 32px 20px 60px;
}

.view { display: none; animation: fadeIn .4s ease; }
.view.active { display: block; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ---------- 封面 ---------- */
.cover {
  text-align: center;
  padding: 56px 32px 44px;
  position: relative;
  overflow: hidden;
}
.cover::before {
  content: "";
  position: absolute; inset: -40%;
  background: conic-gradient(from 0deg, transparent, rgba(77,214,255,.12), transparent 30%, rgba(167,139,255,.12), transparent 60%);
  animation: rotate 24s linear infinite;
  pointer-events: none;
}
@keyframes rotate { to { transform: rotate(360deg); } }

.cover > * { position: relative; }
.cover-badge {
  display: inline-block;
  font-size: 12px; letter-spacing: 2px; color: var(--accent);
  border: 1px solid rgba(77,214,255,.35); border-radius: 999px;
  padding: 6px 16px; margin-bottom: 26px;
}
.cover-title {
  font-family: var(--serif);
  font-size: clamp(40px, 8vw, 68px);
  line-height: 1.08; letter-spacing: 4px;
  background: linear-gradient(120deg, #fff 20%, var(--accent) 55%, var(--accent2) 90%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 60px rgba(77,214,255,.25);
}
.cover-tagline { margin-top: 16px; font-size: 17px; color: var(--text-dim); }
.cover-desc { margin-top: 22px; font-size: 14.5px; line-height: 1.9; color: var(--text-dim); }
.cover-desc b { color: var(--gold); }

.cover-stats {
  display: flex; justify-content: center; gap: 34px;
  margin-top: 30px; flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-num { font-size: 26px; font-weight: 700; color: var(--accent); }
.stat-num.purple { color: var(--accent2); }
.stat-num.gold { color: var(--gold); }
.stat-label { font-size: 12px; color: var(--text-dim); margin-top: 4px; }

/* ---------- 按钮 ---------- */
.btn {
  border: 1px solid var(--panel-border);
  background: rgba(255,255,255,.05);
  color: var(--text); border-radius: 999px;
  padding: 10px 22px; font-size: 14.5px;
  cursor: pointer; transition: all .25s;
  font-family: var(--sans);
}
.btn:hover { transform: translateY(-2px); border-color: rgba(77,214,255,.5); }
.btn-primary {
  background: linear-gradient(135deg, #2bb8e6, #8d6bff);
  border: none; color: #fff; font-weight: 600;
  box-shadow: 0 6px 24px rgba(77, 214, 255, 0.35);
}
.btn-primary:hover { box-shadow: 0 8px 32px rgba(77, 214, 255, 0.55); }
.btn-lg { padding: 14px 38px; font-size: 16px; margin-top: 30px; }
.btn-ghost { background: transparent; }
.btn-ghost.active { border-color: rgba(77,214,255,.55); color: var(--accent); }

/* ---------- 章节目录 ---------- */
.section-title {
  font-size: 20px; margin: 44px 0 18px;
  padding-left: 12px; border-left: 3px solid var(--accent);
}
.chapter-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }

.chapter-card {
  padding: 22px; cursor: pointer;
  transition: transform .3s, border-color .3s, box-shadow .3s;
  position: relative;
}
.chapter-card:hover {
  transform: translateY(-4px);
  border-color: rgba(77, 214, 255, 0.5);
  box-shadow: 0 14px 44px rgba(77, 214, 255, 0.15);
}
.chapter-num {
  font-family: var(--serif); font-size: 34px; font-weight: 700;
  color: transparent; -webkit-text-stroke: 1px rgba(77,214,255,.6);
}
.chapter-card h3 { font-size: 17px; margin-top: 8px; }
.chapter-card .cn { font-size: 13px; color: var(--text-dim); margin-top: 4px; }
.chapter-card .words { font-size: 12px; color: var(--accent); margin-top: 12px; }
.chapter-card .done {
  position: absolute; top: 16px; right: 16px;
  font-size: 11px; color: var(--gold); border: 1px solid rgba(255,215,110,.4);
  padding: 3px 10px; border-radius: 999px;
}

/* ---------- 阅读页 ---------- */
.reader-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 16px 20px; margin-bottom: 18px; flex-wrap: wrap;
}
.reader-title { text-align: center; flex: 1; min-width: 200px; }
.reader-title h2 { font-family: var(--serif); font-size: 21px; }
.reader-title p { font-size: 13px; color: var(--text-dim); margin-top: 3px; }
.reader-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.reader-actions .btn { padding: 8px 14px; font-size: 13px; }

.reader-body {
  padding: 40px 46px;
  font-family: var(--serif);
  font-size: 18.5px; line-height: 2.05;
}
.reader-body p { margin-bottom: 20px; text-align: justify; }
.reader-body p:last-child { margin-bottom: 0; }

/* 可点击词汇 */
.word {
  color: var(--word);
  cursor: pointer;
  border-bottom: 2px dotted var(--word-underline);
  border-radius: 3px;
  padding: 0 1px;
  transition: background .2s, color .2s;
}
.word:hover { background: rgba(77, 214, 255, 0.14); }
.word.saved { color: var(--gold); border-bottom-color: rgba(255, 215, 110, 0.5); }

/* 未开启标注时的弱化样式 */
.reader-body.plain .word { color: inherit; border-bottom: none; }
.reader-body.plain .word:hover { color: var(--word); background: rgba(77,214,255,.1); }
.reader-body.plain .word.saved { color: inherit; }

/* 生词小气泡（标注模式下已保存词额外提示） */
.word.saved::after { content: "★"; font-size: 10px; color: var(--gold); vertical-align: super; margin-left: 1px; }
.reader-body.plain .word.saved::after { content: ""; }

.reader-foot {
  display: flex; justify-content: space-between;
  margin-top: 22px; gap: 12px;
}

/* ---------- 单词卡片弹窗 ---------- */
.popup-mask {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(3, 5, 14, 0.7);
  backdrop-filter: blur(6px);
  display: none; align-items: center; justify-content: center;
  padding: 20px;
}
.popup-mask.show { display: flex; animation: fadeIn .2s ease; }

.word-card {
  width: 100%; max-width: 420px;
  padding: 34px 30px 28px;
  position: relative;
  animation: popUp .28s cubic-bezier(.34,1.56,.64,1);
}
@keyframes popUp { from { transform: scale(.85); opacity: 0; } to { transform: scale(1); opacity: 1; } }

.card-close {
  position: absolute; top: 14px; right: 14px;
  background: transparent; border: none; color: var(--text-dim);
  font-size: 16px; cursor: pointer; padding: 6px; border-radius: 8px;
}
.card-close:hover { color: #fff; background: rgba(255,255,255,.08); }

.card-word-row { display: flex; align-items: center; gap: 14px; }
.card-word { font-family: var(--serif); font-size: 36px; letter-spacing: 1px; }
.speak-btn {
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid rgba(77,214,255,.4);
  background: rgba(77,214,255,.1);
  font-size: 18px; cursor: pointer; transition: all .25s;
}
.speak-btn:hover { background: rgba(77,214,255,.25); transform: scale(1.08); }
.speak-btn.playing { animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(77,214,255,.5); } 50% { box-shadow: 0 0 0 10px rgba(77,214,255,0); } }

.card-ipa { color: var(--accent); font-size: 17px; margin-top: 10px; letter-spacing: .5px; }
.card-pos { color: var(--accent2); font-size: 14px; margin-top: 6px; }
.card-cn { font-size: 19px; margin-top: 12px; line-height: 1.6; }
.card-badges { display: flex; gap: 8px; margin-top: 16px; }
.badge {
  font-size: 12px; padding: 4px 12px; border-radius: 999px;
  border: 1px solid rgba(255,215,110,.45); color: var(--gold);
}
.badge-dim { border-color: var(--panel-border); color: var(--text-dim); }
#cardSave { width: 100%; margin-top: 22px; }

/* ---------- 概要弹窗 ---------- */
.summary-card {
  width: 100%; max-width: 520px;
  padding: 32px 30px; position: relative;
  animation: popUp .28s cubic-bezier(.34,1.56,.64,1);
}
.summary-card h3 { margin-bottom: 14px; font-size: 18px; }
.summary-card p { font-size: 15.5px; line-height: 2; color: #cdd6f5; }

/* ---------- 生词本 & 词库 ---------- */
.panel-head { margin-bottom: 22px; }
.panel-head h2 { font-size: 22px; }
.panel-head p { color: var(--text-dim); font-size: 13.5px; margin-top: 6px; }

.word-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px;
}
.word-item {
  padding: 16px 18px; transition: transform .25s, border-color .25s;
}
.word-item:hover { transform: translateY(-3px); border-color: rgba(77,214,255,.45); }
.wi-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.wi-word { font-family: var(--serif); font-size: 19px; cursor: pointer; }
.wi-word:hover { color: var(--accent); }
.wi-ipa { color: var(--accent); font-size: 12.5px; margin-top: 5px; }
.wi-cn { font-size: 13.5px; color: #cdd6f5; margin-top: 7px; }
.wi-bottom { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; }
.wi-grade { font-size: 11px; color: var(--text-dim); }
.wi-actions { display: flex; gap: 6px; }
.mini-btn {
  background: transparent; border: 1px solid var(--panel-border);
  color: var(--text-dim); border-radius: 8px;
  padding: 4px 9px; font-size: 12px; cursor: pointer; transition: all .2s;
}
.mini-btn:hover { color: var(--accent); border-color: rgba(77,214,255,.5); }
.mini-btn.del:hover { color: #ff7b9c; border-color: rgba(255,123,156,.5); }

.vocab-controls { display: flex; gap: 12px; margin-top: 18px; flex-wrap: wrap; align-items: center; }
.grade-filter { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  background: transparent; border: 1px solid var(--panel-border);
  color: var(--text-dim); border-radius: 999px;
  padding: 6px 16px; font-size: 13px; cursor: pointer; transition: all .2s;
}
.chip:hover { color: var(--text); }
.chip.active {
  color: var(--accent); border-color: rgba(77,214,255,.55);
  background: rgba(77,214,255,.1);
}
.search-input {
  flex: 1; min-width: 180px;
  background: rgba(255,255,255,.06); border: 1px solid var(--panel-border);
  border-radius: 999px; padding: 9px 18px;
  color: var(--text); font-size: 14px; outline: none;
}
.search-input:focus { border-color: rgba(77,214,255,.55); }
.search-input::placeholder { color: var(--text-dim); }

.empty-tip {
  grid-column: 1 / -1; text-align: center;
  color: var(--text-dim); padding: 60px 0; font-size: 14.5px;
}

/* ---------- 页脚 ---------- */
.foot {
  position: relative; z-index: 1;
  text-align: center; padding: 26px 16px 34px;
  color: var(--text-dim); font-size: 12.5px;
  border-top: 1px solid rgba(120,160,255,.1);
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .topbar { padding: 10px 14px; }
  .logo-cn { display: none; }
  .nav-tab { padding: 7px 12px; font-size: 13px; }
  .reader-body { padding: 26px 20px; font-size: 16.5px; line-height: 1.95; }
  .cover { padding: 40px 18px 34px; }
  .reader-head { justify-content: center; }
}