/* 多语言学习助手 - 简约版样式(浅色/深色 × 6 套低饱和配色) */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --text: #2b3140;
  --muted: #7a8294;
  --card: rgba(255, 255, 255, .78);
  --card-solid: #ffffff;
  --input-bg: rgba(255, 255, 255, .88);
  --border: rgba(43, 49, 64, .10);
  --primary: #5b6b7f;
  --primary-2: #7d8fa3;
  --primary-dark: #43536b;
  --primary-light: #c3cdda;
  --primary-bg: rgba(91, 107, 127, .08);
  --accent: #a3534a;
  --accent-bg: rgba(163, 83, 74, .07);
  --green: #4f8f6e;
  --green-bg: rgba(79, 143, 110, .10);
  --tip-bg: rgba(183, 148, 64, .12);
  --tip-border: rgba(183, 148, 64, .32);
  --tip-text: #7a5c1e;
  --face1: linear-gradient(160deg, rgba(255, 255, 255, .96) 0%, rgba(244, 246, 249, .9) 100%);
  --face2: linear-gradient(160deg, rgba(255, 255, 255, .96) 0%, rgba(243, 246, 244, .9) 100%);
  --inset-hl: inset 0 1px 0 rgba(255, 255, 255, .7);
  --shadow: 0 1px 4px rgba(43, 49, 64, .06);
  --shadow-md: 0 4px 14px rgba(43, 49, 64, .08);
  --shadow-lg: 0 10px 30px rgba(43, 49, 64, .12);
  --glow: 0 4px 14px rgba(91, 107, 127, .25);
  --radius: 16px;
}

body.dark {
  --text: #e3e6ec;
  --muted: #8e96a6;
  --card: rgba(28, 32, 40, .66);
  --card-solid: #1c2028;
  --input-bg: rgba(28, 32, 40, .8);
  --border: rgba(227, 230, 236, .12);
  --primary: #93a4b8;
  --primary-2: #aebcc9;
  --primary-dark: #c3cdda;
  --primary-light: #5b6b7f;
  --primary-bg: rgba(147, 164, 184, .14);
  --accent: #c07a70;
  --accent-bg: rgba(192, 122, 112, .12);
  --green: #5aa383;
  --green-bg: rgba(90, 163, 131, .12);
  --tip-bg: rgba(183, 148, 64, .10);
  --tip-border: rgba(183, 148, 64, .26);
  --tip-text: #d8c07e;
  --face1: linear-gradient(160deg, rgba(36, 41, 51, .92) 0%, rgba(28, 32, 40, .9) 100%);
  --face2: linear-gradient(160deg, rgba(33, 43, 39, .92) 0%, rgba(26, 35, 31, .9) 100%);
  --inset-hl: inset 0 1px 0 rgba(255, 255, 255, .06);
  --shadow: 0 1px 4px rgba(0, 0, 0, .25);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, .3);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, .38);
  --glow: 0 4px 14px rgba(0, 0, 0, .3);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', 'Microsoft YaHei', -apple-system, 'PingFang SC', sans-serif;
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color-scheme: light;
  background: linear-gradient(180deg, #f7f8fa, #eef0f4);
  background-attachment: fixed;
  overflow-x: hidden;
}
body.dark {
  color-scheme: dark;
  background: linear-gradient(180deg, #14171d, #1b1f26);
}

::selection { background: rgba(91, 107, 127, .2); }

/* 顶栏 */
.site-header {
  background: rgba(255, 255, 255, .66);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
body.dark .site-header { background: rgba(20, 23, 29, .66); }
.header-inner {
  max-width: 1060px; margin: 0 auto; padding: 14px 20px 8px;
  display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  width: 46px; height: 46px; border-radius: 14px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--glow);
  text-decoration: none; /* 点击返回首页 */
  transition: transform .2s ease;
}
.brand-logo:hover { transform: scale(1.06) rotate(-2deg); }
.brand-logo svg { display: block; }
}
.brand-text h1 {
  font-size: 19px; letter-spacing: .5px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.brand-text p { font-size: 12px; color: var(--muted); }

.header-right { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.theme-toggle {
  width: 40px; height: 40px; border-radius: 50%; font-size: 17px;
  border: 1px solid var(--border); background: var(--card);
  cursor: pointer; transition: all .2s; backdrop-filter: blur(8px);
}
.theme-toggle:hover { transform: scale(1.08); border-color: var(--primary); }
.lang-select {
  appearance: none; -webkit-appearance: none;
  border: 1px solid var(--border); background: var(--input-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%238f9ab5' stroke-width='1.5' fill='none'/%3E%3C/svg%3E") no-repeat right 12px center;
  border-radius: 10px; padding: 8px 30px 8px 12px;
  font-size: 14px; font-family: inherit; color: var(--text); cursor: pointer;
  transition: border-color .15s, box-shadow .15s;
}
.lang-select:hover, .lang-select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(91, 107, 127, .15); outline: none; }

/* 导航:header 底行整行居中,窄屏横向滑动,始终一眼找到入口 */
.tabs {
  display: flex; justify-content: center; gap: 4px;
  padding: 0 18px 12px;
  overflow-x: auto;
  scrollbar-width: none; -ms-overflow-style: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  border: none; background: transparent; color: var(--muted);
  padding: 8px 16px; border-radius: 10px; cursor: pointer; font-size: 14px;
  transition: all .18s; font-family: inherit;
  text-decoration: none; /* 导航为页面链接 */
  display: inline-block; white-space: nowrap;
}
.tab:hover { color: var(--primary); background: var(--primary-bg); }
.tab.active {
  background: var(--primary-bg); color: var(--primary);
  font-weight: 600;
}

/* 主体 */
.container { max-width: 1060px; width: 100%; margin: 0 auto; padding: 36px 22px 64px; flex: 1; }

/* 概览看板 */
.hero {
  display: flex; justify-content: space-between; align-items: center; gap: 22px; flex-wrap: wrap;
  background: var(--card); border: 1px solid var(--border); border-radius: 22px;
  padding: 30px 36px; margin-bottom: 28px;
  box-shadow: var(--inset-hl), var(--shadow-md);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.hero-main h2 {
  font-size: 26px; font-weight: 800; letter-spacing: .5px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-date { font-size: 13px; color: var(--muted); margin-top: 2px; }
.hero-quote { margin-top: 14px; padding-left: 14px; border-left: 3px solid var(--primary); max-width: 480px; }
.hero-quote .quote-ru { display: block; font-size: 17px; font-style: italic; color: var(--text); }
.hero-quote .quote-zh { display: block; font-size: 13px; color: var(--muted); margin-top: 2px; }
.hero-quote.quote-fade { animation: quoteFade .8s ease; }
@keyframes quoteFade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.hero-stats { display: flex; gap: 12px; flex-wrap: wrap; }
.stat-card {
  min-width: 132px; text-align: center;
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 16px 20px; box-shadow: var(--inset-hl), var(--shadow);
  transition: transform .18s, box-shadow .18s;
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--inset-hl), var(--shadow-md); }
.stat-num {
  font-size: 28px; font-weight: 800; line-height: 1.2;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.stat-label { font-size: 12px; color: var(--muted); }

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn .35s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; } }
.fade-item { animation: fadeUp .5s both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.panel-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 22px; }
.panel-head h2 { font-size: 24px; letter-spacing: .5px; }
.panel-head h2::after {
  content: ''; display: block; width: 36px; height: 3px; border-radius: 2px; margin-top: 7px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
}
.stats {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--muted); font-size: 13px;
  background: var(--card); border: 1px solid var(--border); border-radius: 999px; padding: 7px 16px;
  box-shadow: var(--shadow); backdrop-filter: blur(8px);
}
.stats b { color: var(--primary); font-size: 15px; }
.stats-bar { width: 56px; height: 4px; border-radius: 999px; background: var(--primary-bg); overflow: hidden; }
.stats-bar i {
  display: block; height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  transition: width .4s ease;
}
.sub-tip { color: var(--muted); font-size: 13px; margin: -6px 0 18px; }
.sec-title { margin: 30px 0 4px; font-size: 18px; letter-spacing: .3px; }

/* 按钮 */
.btn {
  border: none; border-radius: 11px; padding: 11px 20px; font-size: 14px;
  cursor: pointer; font-family: inherit; transition: all .18s;
}
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn:active:not(:disabled) { transform: scale(.96); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, .32);
}
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: var(--glow); }
.btn-outline { background: var(--card); border: 1px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary-bg); }
.btn-light { background: var(--card); border: 1px solid var(--border); color: var(--text); box-shadow: var(--shadow); }
.btn-light:hover { border-color: var(--muted); transform: translateY(-2px); }
.btn-success {
  background: linear-gradient(135deg, #10b981, #34d399); color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, .3);
}
.btn-success:hover:not(:disabled) { transform: translateY(-2px); }
.btn-danger {
  background: linear-gradient(135deg, var(--accent), #f43f5e); color: #fff;
  box-shadow: 0 4px 14px rgba(225, 29, 72, .28);
}
.btn-danger:hover:not(:disabled) { transform: translateY(-2px); }
.btn-soft-danger { background: var(--accent-bg); border: 1px solid var(--accent); color: var(--accent); }
.btn-soft-danger:hover:not(:disabled) { background: rgba(163, 83, 74, .16); border-color: var(--accent); transform: translateY(-1px); }
.btn-warn { background: var(--tip-bg); border: 1px solid var(--tip-border); color: var(--tip-text); }
.btn-warn:hover:not(:disabled) { background: rgba(183, 148, 64, .22); border-color: var(--tip-text); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--muted); padding: 6px 10px; font-size: 12px; }
.btn-ghost:hover { color: var(--accent); }
.btn-lg { padding: 13px 30px; font-size: 16px; border-radius: 13px; }
.btn-sm { padding: 5px 12px; font-size: 12px; border-radius: 8px; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* 筛选栏 */
.controls { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.controls input, .controls select {
  padding: 10px 14px; border: 1px solid var(--border); border-radius: 11px;
  font-size: 14px; font-family: inherit; background: var(--input-bg); color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.controls input:focus, .controls select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .15); outline: none; }
.controls input { flex: 1; min-width: 160px; }
.controls select { cursor: pointer; }

/* 单词卡片 */
.flashcard {
  max-width: 560px; height: 310px; margin: 0 auto 18px;
  perspective: 1400px; cursor: pointer;
  transition: height .35s ease, transform .25s ease;
}
.flashcard.has-ex { height: 420px; } /* 有例句时加高,背面放得下 */
.flashcard-inner {
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d; transition: transform .55s cubic-bezier(.4, .1, .2, 1);
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border: 1px solid var(--border); border-radius: 22px;
  box-shadow: var(--inset-hl), 0 14px 34px rgba(30, 41, 59, .08);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  padding: 28px;
}
.flashcard-front { background: var(--face1); }
.flashcard-back { transform: rotateY(180deg); background: var(--face2); }
.ru-word {
  font-size: 48px; font-weight: 700; color: var(--primary-dark); text-align: center;
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
  letter-spacing: .5px;
}
.zh-word { font-size: 32px; font-weight: 600; letter-spacing: .5px; }
.hint { font-size: 12.5px; color: var(--muted); opacity: .75; letter-spacing: .5px; }
.cat-tag {
  background: var(--primary-bg); color: var(--primary);
  font-size: 12px; padding: 3px 12px; border-radius: 999px;
}
.speak-btn {
  position: absolute; top: 14px; left: 14px;
  border: none; background: var(--primary-bg); color: var(--primary-dark); border-radius: 999px;
  width: 38px; height: 38px; cursor: pointer; font-size: 16px;
  transition: all .15s;
}
.speak-btn:hover { background: var(--primary); color: #fff; transform: scale(1.08); }
.speak-btn.small {
  position: static; width: 30px; height: 30px; font-size: 14px; line-height: 1;
  flex-shrink: 0; box-shadow: none;
}
.known-badge {
  position: absolute; top: 16px; right: 16px;
  background: var(--green-bg); color: var(--green);
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
}

.card-actions {
  display: flex; gap: 10px; justify-content: center; align-items: center;
  flex-wrap: wrap; margin-bottom: 16px;
}
.card-actions .btn-soft-danger, .card-actions .btn-warn, .card-actions .btn-success { min-width: 110px; }
.card-main-btn { padding: 12px 30px; font-size: 15px; }
.btn-nav {
  min-width: 40px; padding: 11px 13px; background: transparent;
  border: 1px solid transparent; color: var(--muted); border-radius: 11px;
  font-size: 15px;
}
.btn-nav:hover:not(:disabled) { border-color: var(--border); background: var(--card); color: var(--text); transform: none; }
.progress-text { text-align: center; color: var(--muted); font-size: 12.5px; opacity: .85; margin-bottom: 9px; }
.known-bar {
  height: 4px; background: var(--primary-bg); border: none;
  border-radius: 999px; overflow: hidden; max-width: 560px; margin: 0 auto;
}
.known-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, #34d399);
  border-radius: 999px; transition: width .3s;
}

/* 测验 */
.quiz-start {
  text-align: center; background: var(--card); border: 1px dashed var(--border); border-radius: var(--radius);
  padding: 44px 20px; box-shadow: var(--shadow);
}
.quiz-start p { margin-bottom: 20px; color: var(--muted); }
.quiz-top { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; margin-bottom: 10px; }
.quiz-question {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; font-size: 18px; text-align: center; margin-bottom: 16px;
  box-shadow: var(--shadow-md); backdrop-filter: blur(12px);
}
.q-ru {
  font-size: 30px; font-weight: 700; color: var(--primary);
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.quiz-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.quiz-option {
  display: flex; align-items: center; gap: 10px; text-align: left;
  background: var(--card); border: 1px solid var(--border); border-radius: 13px;
  padding: 14px 16px; font-size: 16px; cursor: pointer; font-family: inherit; color: var(--text);
  transition: all .16s; box-shadow: var(--shadow); backdrop-filter: blur(8px);
}
.quiz-option:hover:not(:disabled) { border-color: var(--primary); background: var(--primary-bg); transform: translateY(-2px); }
.quiz-option:disabled { cursor: default; }
.quiz-option .opt-label {
  width: 26px; height: 26px; border-radius: 8px; background: var(--primary-bg); color: var(--primary);
  display: inline-flex; align-items: center; justify-content: center; font-size: 13px; flex-shrink: 0;
}
.quiz-option.correct { background: var(--green-bg); border-color: var(--green); }
.quiz-option.correct .opt-label { background: var(--green); color: #fff; }
.quiz-option.wrong { background: var(--accent-bg); border-color: var(--accent); }
.quiz-option.wrong .opt-label { background: var(--accent); color: #fff; }
#quiz-next { display: block; margin: 16px auto 0; min-width: 160px; }

.result-box {
  text-align: center; background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow-md); padding: 30px; margin-bottom: 20px;
  backdrop-filter: blur(12px);
}
.score-ring {
  width: 112px; height: 112px; border-radius: 50%; margin: 0 auto 10px;
  background: linear-gradient(135deg, var(--primary-bg), rgba(139, 92, 246, .12)); color: var(--primary);
  display: flex; align-items: center; justify-content: center; flex-direction: column;
  font-size: 36px; font-weight: 700; box-shadow: inset 0 0 0 6px var(--card-solid), var(--shadow);
}
.score-ring small { font-size: 13px; font-weight: 400; color: var(--muted); }
.result-msg { color: var(--muted); margin-bottom: 8px; }
#quiz-again { display: block; margin: 10px auto 0; }
.wrong-list { margin: 12px 0 20px; display: flex; flex-direction: column; gap: 8px; }
.wrong-item {
  background: var(--card); border: 1px solid var(--border); border-radius: 13px;
  padding: 10px 14px; display: flex; align-items: center; gap: 12px; box-shadow: var(--shadow);
}
.wrong-ru {
  font-weight: 700; font-size: 17px; color: var(--primary);
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.wrong-zh { color: var(--text); flex: 1; }
.no-wrong { text-align: center; color: var(--muted); padding: 10px 0; }

/* 拼写 */
.spell-question {
  position: relative;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 34px 20px; text-align: center; margin-bottom: 16px;
  box-shadow: var(--shadow-md); backdrop-filter: blur(12px);
}
.spell-question .speak-btn { top: 10px; left: 10px; }
.spell-zh { font-size: 26px; font-weight: 600; }
.spell-hint { font-size: 12px; color: var(--muted); margin-top: 10px; }
.spell-input-row { display: flex; gap: 10px; max-width: 480px; margin: 0 auto 12px; }
.spell-input-row input {
  flex: 1; min-width: 0; padding: 12px 14px; border: 1px solid var(--border); border-radius: 12px;
  font-size: 18px; font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
  background: var(--input-bg); color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.spell-input-row input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .15); outline: none; }
.spell-input-row input:disabled { opacity: .6; }
.spell-feedback { text-align: center; font-size: 16px; min-height: 28px; margin-bottom: 10px; }
.spell-feedback.ok { color: var(--green); }
.spell-feedback.no { color: var(--accent); }
.spell-correct-word { font-family: Georgia, 'Times New Roman', serif; font-weight: 700; margin: 0 6px; }
#spell-next { display: block; margin: 0 auto; min-width: 160px; }

/* 口语 */
.rate-btns { display: flex; gap: 8px; margin-bottom: 12px; }
.rate-btns .active {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; border-color: transparent; box-shadow: 0 3px 10px rgba(79, 70, 229, .3);
}
.sentence-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 8px; }
.sentence-item {
  background: var(--card); border: 1px solid var(--border); border-radius: 13px;
  padding: 13px 16px; display: flex; align-items: center; gap: 12px;
  box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s;
  backdrop-filter: blur(8px);
}
.sentence-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.s-no { color: var(--muted); font-size: 12px; width: 24px; text-align: right; flex-shrink: 0; }
.sentence-item .ru {
  font-size: 17px; font-weight: 600; color: var(--primary-dark); flex: 1;
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.sentence-item .zh { color: var(--text); flex: 1.4; font-size: 14px; }

.twister-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 13px;
  padding: 15px 16px; margin-bottom: 10px; box-shadow: var(--shadow);
  border-left: 4px solid var(--accent); backdrop-filter: blur(8px);
}
.twister-card .ru {
  font-size: 16px; font-weight: 600; margin-bottom: 4px;
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.twister-card .zh { color: var(--muted); font-size: 13px; }
.twister-card .tip { color: var(--accent); font-size: 12px; margin-top: 4px; }

.dialogue-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 15px;
  padding: 18px; margin-bottom: 14px; box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
}
.dialogue-card h4 { margin-bottom: 12px; font-size: 16px; }
.dialogue-line { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 9px; }
.dialogue-who {
  background: linear-gradient(135deg, var(--primary-bg), rgba(139, 92, 246, .12)); color: var(--primary);
  font-size: 12px; font-weight: 600;
  padding: 3px 10px; border-radius: 999px; white-space: nowrap; margin-top: 2px;
}
.dialogue-text { flex: 1; }
.dialogue-text .ru { font-weight: 600; font-family: Georgia, 'Times New Roman', 'Noto Serif', serif; }
.dialogue-text .zh { color: var(--muted); font-size: 13px; }

/* 字母表 */
.letter-group { margin-bottom: 26px; }
.letter-group h3 { font-size: 16px; color: var(--primary); margin-bottom: 10px; }
.letter-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(235px, 1fr)); gap: 10px; }
.letter-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 13px;
  padding: 14px; display: flex; gap: 14px; align-items: flex-start;
  transition: all .18s; box-shadow: var(--shadow); backdrop-filter: blur(8px);
}
.letter-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--primary); }
.letter-big {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-width: 58px; height: 72px; border-radius: 12px;
  background: linear-gradient(150deg, var(--primary-bg), rgba(139, 92, 246, .13));
  font-size: 26px; font-weight: 700; color: var(--primary); line-height: 1.25;
}
.letter-big .letter-lower { font-size: 15px; font-weight: 400; color: var(--muted); }
.letter-info { flex: 1; min-width: 0; }
.letter-ipa { font-weight: 700; }
.letter-note { font-size: 12.5px; color: var(--muted); margin: 2px 0 6px; }
.letter-example { font-size: 13px; display: flex; align-items: center; gap: 6px; }

/* 日常用语 */
.phrase-filter input {
  width: 100%; max-width: 320px; padding: 9px 12px; border: 1px solid var(--border);
  border-radius: 11px; margin-bottom: 14px; font-size: 14px; font-family: inherit;
  background: var(--input-bg); color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.phrase-filter input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .15); outline: none; }
.phrase-group h3 { font-size: 16px; color: var(--primary); margin: 20px 0 8px; }
.phrase-list { display: flex; flex-direction: column; gap: 8px; }
.phrase-item {
  background: var(--card); border: 1px solid var(--border); border-radius: 13px;
  padding: 12px 16px; display: flex; align-items: center; gap: 12px;
  box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s;
  backdrop-filter: blur(8px);
}
.phrase-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.phrase-item .ru {
  font-size: 17px; font-weight: 600; color: var(--primary-dark); flex: 1;
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.phrase-item .zh { color: var(--text); flex: 1.4; font-size: 14px; }

/* 语法 */
.grammar-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  margin-bottom: 10px; overflow: hidden; box-shadow: var(--shadow);
  transition: box-shadow .18s; backdrop-filter: blur(8px);
}
.grammar-card:hover { box-shadow: var(--shadow-md); }
.grammar-card summary {
  padding: 15px 18px; cursor: pointer; font-weight: 600; font-size: 15px;
  list-style: none; display: flex; justify-content: space-between; align-items: center;
  transition: background .15s;
}
.grammar-card summary:hover { background: var(--primary-bg); }
.grammar-card summary::-webkit-details-marker { display: none; }
.grammar-card summary::after { content: '▾'; color: var(--muted); transition: transform .2s; }
.grammar-card[open] summary::after { transform: rotate(180deg); }
.grammar-body { padding: 4px 18px 16px; border-top: 1px dashed var(--border); }
.grammar-body p { margin: 8px 0; }
.g-table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 14px; }
.g-table th, .g-table td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }
.g-table th { background: var(--primary-bg); color: var(--primary); }
.g-table tr:nth-child(even) td { background: rgba(148, 163, 184, .06); }
.g-list { margin: 6px 0 6px 20px; }
.g-list li { margin: 4px 0; }
.grammar-body .tip {
  background: var(--tip-bg); border: 1px solid var(--tip-border); border-radius: 9px;
  padding: 8px 12px; font-size: 13px; color: var(--tip-text);
}

/* 打卡 */
.checkin-hero {
  text-align: center; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-md); padding: 32px 20px; margin-bottom: 24px;
  backdrop-filter: blur(12px);
}
.streak-num {
  font-size: 58px; font-weight: 800; line-height: 1.1;
  background: linear-gradient(135deg, var(--accent), #f59e0b);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.streak-label { color: var(--muted); margin-bottom: 14px; }
.checkin-msg { margin-top: 12px; color: var(--muted); font-size: 14px; }
.calendar {
  display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px;
  max-width: 420px; margin: 10px auto 6px;
}
.cal-head { text-align: center; font-size: 12px; color: var(--muted); padding: 4px 0; }
.cal-cell {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  background: var(--card); border: 1px solid var(--border); border-radius: 9px;
  font-size: 13px; color: var(--text); transition: transform .12s;
}
.cal-cell:hover { transform: scale(1.1); }
.cal-cell.checked {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border-color: transparent; color: #fff; box-shadow: 0 3px 10px rgba(79, 70, 229, .4);
}
.cal-cell.today { outline: 2px solid var(--accent); outline-offset: 1px; font-weight: 700; }
.cal-cell.future { opacity: .35; }
.total-days { text-align: center; color: var(--muted); font-size: 14px; margin-top: 8px; }
.total-days b { color: var(--primary); }

/* 弹窗 */
.modal {
  position: fixed; inset: 0; background: rgba(10, 14, 26, .5);
  backdrop-filter: blur(5px);
  display: flex; align-items: center; justify-content: center; z-index: 100; padding: 20px;
}
.modal[hidden] { display: none; }
.modal-box {
  background: var(--card-solid); border-radius: var(--radius); padding: 26px; width: 100%; max-width: 380px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg); animation: popIn .22s;
}
@keyframes popIn { from { opacity: 0; transform: scale(.92); } to { opacity: 1; transform: scale(1); } }
.modal-box h3 { margin-bottom: 14px; }
.modal-box input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 11px;
  font-size: 15px; font-family: inherit; margin-bottom: 10px;
  background: var(--input-bg); color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.modal-box input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .15); outline: none; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 6px; }

/* 提示 */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(20px);
  background: rgba(15, 21, 40, .88); color: #fff; padding: 10px 22px; border-radius: 999px;
  font-size: 14px; opacity: 0; pointer-events: none; transition: all .25s; z-index: 200;
  box-shadow: var(--shadow-lg); backdrop-filter: blur(8px);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 页脚 */
.site-footer {
  text-align: center; color: var(--muted); font-size: 12px;
  padding: 14px; border-top: 1px solid var(--border);
  background: var(--card);
}

/* 滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #c3cde4; border-radius: 999px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: #aab8d8; border: 2px solid transparent; background-clip: padding-box; }
body.dark ::-webkit-scrollbar-thumb { background: #2c3652; border: 2px solid transparent; background-clip: padding-box; }
body.dark ::-webkit-scrollbar-thumb:hover { background: #3b4666; border: 2px solid transparent; background-clip: padding-box; }

/* 词库包 + 卡片辨析说明 */
/* 词库包选择面板:打开首页先选包,点入才展开单词 */
.pack-gate { margin-bottom: 8px; }
.pack-gate .sub-tip { margin: 2px 2px 14px; }
.pack-gate-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.pack-card {
  text-align: left; display: flex; flex-direction: column; gap: 8px;
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 18px 20px; cursor: pointer; font-family: inherit; color: var(--text);
  transition: transform .2s, border-color .2s, box-shadow .2s;
  box-shadow: var(--shadow); backdrop-filter: blur(8px);
}
.pack-card:hover { transform: translateY(-4px); border-color: var(--primary); box-shadow: var(--shadow-md); }
.pack-card-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.pack-card-name { font-size: 16px; font-weight: 600; color: var(--primary-dark); }
.pack-card-count {
  font-size: 12px; background: var(--primary-bg); color: var(--primary);
  padding: 2px 10px; border-radius: 999px; font-weight: 600; flex-shrink: 0;
}
.pack-card-desc { font-size: 12.5px; color: var(--muted); line-height: 1.55; margin: 0; }
.pack-card-bar { height: 5px; background: var(--primary-bg); border-radius: 999px; overflow: hidden; }
.pack-card-bar i {
  display: block; height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  transition: width .5s ease;
}
.pack-card-meta { font-size: 11.5px; color: var(--muted); }
/* 单词学习区展开 / 切包的平滑过渡 */
#vocab-area { animation: fadeIn .45s ease; }
#vocab-area.area-fade { animation: areaIn .45s cubic-bezier(.22, .9, .36, 1) both; }
@keyframes areaIn {
  from { opacity: 0; transform: translateY(18px); }
}
/* 词库包选择面板退场:淡出并轻微上移 */
#pack-gate.gate-leave { animation: gateOut .32s cubic-bezier(.4, 0, 1, 1) both; }
@keyframes gateOut {
  to { opacity: 0; transform: translateY(-10px); }
}

/* 词库包页签:四个包分开显示,整体分段控制器 */
.pack-tabs {
  display: inline-flex; gap: 4px; flex-wrap: wrap; padding: 5px;
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  box-shadow: var(--shadow); margin-bottom: 18px;
}
.pack-tab {
  display: inline-flex; align-items: center; gap: 8px;
  border: none; background: transparent; color: var(--muted);
  border-radius: 10px; padding: 7px 15px; font-size: 13.5px; cursor: pointer;
  transition: all .18s;
}
.pack-tab:hover { color: var(--primary); background: var(--primary-bg); }
.pack-tab.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; box-shadow: 0 3px 10px rgba(79, 70, 229, .28);
}
.pack-count {
  font-size: 11px; background: var(--primary-bg); color: var(--primary);
  border-radius: 999px; padding: 1px 7px; font-weight: 600;
}
.pack-tab.active .pack-count { background: rgba(255, 255, 255, .24); color: #fff; }
.card-note {
  margin-top: 10px; font-size: 13px; line-height: 1.55; color: var(--muted);
  background: var(--primary-bg); border-left: 3px solid var(--primary);
  border-radius: 8px; padding: 8px 12px; text-align: left; max-width: 92%;
}
/* 卡片背面例句 */
.card-examples {
  display: flex; flex-direction: column; gap: 6px;
  width: 100%; max-width: 92%; margin-top: 4px;
}
.example-title { font-size: 11.5px; color: var(--muted); letter-spacing: .3px; }
.example-item {
  display: flex; flex-direction: column; gap: 2px; text-align: left;
  border: 1px solid var(--border); background: var(--card);
  border-radius: 10px; padding: 8px 12px; cursor: pointer;
  font-family: inherit; transition: all .15s;
}
.example-item:hover { border-color: var(--primary); transform: translateX(3px); }
.example-ru { font-size: 14px; font-weight: 600; color: var(--primary-dark); }
.example-zh { font-size: 12.5px; color: var(--muted); }

/* 复习四视图 */
.review-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.review-tab {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  border-radius: 999px; padding: 8px 18px; font-size: 14px; cursor: pointer;
  transition: all .15s; box-shadow: var(--shadow);
}
.review-tab:hover { border-color: var(--primary); }
.review-tab.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border-color: transparent; color: #fff;
}

/* 生词本 / 错词本列表 */
.book-list { display: flex; flex-direction: column; gap: 8px; max-width: 720px; }
.book-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 10px 14px; box-shadow: var(--shadow);
}
.book-ru { font-weight: 600; font-size: 16px; font-family: Georgia, 'Times New Roman', 'Noto Serif', serif; min-width: 120px; }
.book-zh { color: var(--text); font-size: 14px; flex: 1; }
.book-meta { color: var(--muted); font-size: 12px; white-space: nowrap; }
.wrong-fix-btn { flex-shrink: 0; }

/* 日历双栏 + 计数徽章 */
.cal-duo { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.cal-col { flex: 1; min-width: 300px; max-width: 440px; }
.cal-title { text-align: center; font-size: 15px; margin: 4px 0 8px; }
.cal-cell { position: relative; }
.cal-cell.has-count { background: var(--primary-bg); border-color: var(--primary); font-weight: 600; }
.cal-count {
  position: absolute; top: -7px; right: -7px;
  min-width: 18px; height: 18px; padding: 0 4px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; font-size: 10px; font-weight: 700; line-height: 18px;
  border-radius: 999px; box-shadow: 0 2px 6px rgba(79, 70, 229, .45);
}

/* 移动端 */
@media (max-width: 640px) {
  .quiz-options { grid-template-columns: 1fr; }
  .ru-word { font-size: 32px; }
  .zh-word { font-size: 25px; }
  .header-inner { padding: 12px 14px 6px; }
  .tabs { justify-content: flex-start; padding: 0 12px 10px; }
  .tab { padding: 7px 12px; font-size: 13px; }
  .hero { padding: 20px; }
  .hero-stats { width: 100%; }
  .stat-card { flex: 1; min-width: 92px; }
  .sentence-item, .phrase-item { flex-wrap: wrap; }
  .sentence-item .zh, .phrase-item .zh { flex-basis: 100%; }
  .book-item { flex-wrap: wrap; }
  .book-meta { flex-basis: 100%; }
  .cal-col { min-width: 100%; }
}

/* ===== 分类胶囊 ===== */
.cat-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.cat-chip {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  border-radius: 999px; padding: 7px 14px; font-size: 13.5px; cursor: pointer;
  font-family: inherit; transition: all .16s; box-shadow: var(--shadow); backdrop-filter: blur(8px);
}
.cat-chip:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.cat-chip.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border-color: transparent; color: #fff; box-shadow: var(--glow);
}
.cat-chip-n {
  min-width: 20px; height: 20px; padding: 0 6px; border-radius: 999px;
  background: var(--primary-bg); color: var(--primary); font-size: 11px; font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
}
.cat-chip.active .cat-chip-n { background: rgba(255, 255, 255, .25); color: #fff; }

/* ===== 单词列表网格(默认折叠,点标题展开) ===== */
.word-grid-toggle {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  width: 100%; margin: 28px 0 12px; padding: 8px 12px;
  background: transparent; border: none; border-radius: 10px; cursor: pointer;
  font-family: inherit; color: var(--muted); transition: background .2s;
}
.word-grid-toggle:hover { background: var(--primary-bg); }
.word-grid-title {
  display: flex; align-items: center; gap: 10px;
  margin: 0; font-size: 14px; color: var(--muted);
  font-weight: 600; letter-spacing: .3px;
}
.word-grid-title::before {
  content: ''; width: 4px; height: 16px; border-radius: 2px;
  background: linear-gradient(180deg, var(--primary), var(--primary-2));
}
.grid-toggle-arrow {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--primary-bg); color: var(--primary);
  font-size: 12px; transition: transform .35s cubic-bezier(.22, .9, .36, 1), background .2s;
}
.grid-toggle-arrow.open { transform: rotate(180deg); }
/* 折叠容器:grid-template-rows 0fr→1fr 平滑展开,无需知道内容高度 */
.word-grid-wrap {
  display: grid; grid-template-rows: 0fr;
  opacity: 0; transform: translateY(-6px);
  transition: grid-template-rows .5s cubic-bezier(.22, .9, .36, 1), opacity .35s ease, transform .35s ease;
}
.word-grid-wrap.open { grid-template-rows: 1fr; opacity: 1; transform: none; }
.word-grid-wrap > .word-grid { min-height: 0; overflow: hidden; }
.word-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(176px, 1fr)); gap: 12px; }
.word-item {
  position: relative; text-align: left; display: flex; flex-direction: column; gap: 2px;
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 12px 14px; cursor: pointer; font-family: inherit; color: var(--text);
  transition: all .15s; box-shadow: var(--shadow); backdrop-filter: blur(8px); overflow: hidden;
}
.word-item:hover { transform: translateY(-3px); border-color: var(--primary); box-shadow: var(--shadow-md); }
.word-item.current { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(79, 70, 229, .18), var(--shadow-md); }
.word-item.learned {
  border-color: rgba(5, 150, 105, .4);
  background: linear-gradient(160deg, var(--card), var(--green-bg));
}
.word-ru {
  font-weight: 700; font-size: 16px; color: var(--primary-dark);
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.word-zh { font-size: 12.5px; color: var(--text); }
.word-meta { font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.word-check {
  position: absolute; top: 8px; right: 8px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--green); color: #fff; font-size: 11px; line-height: 18px; text-align: center;
  box-shadow: 0 2px 6px rgba(5, 150, 105, .4);
}
.word-item.fuzzy .word-check { background: #b78b34; box-shadow: 0 2px 6px rgba(183, 139, 52, .4); }
.word-item.fuzzy { border-color: var(--tip-border); }
.book-fuzzy {
  background: var(--tip-bg); border: 1px solid var(--tip-border); color: var(--tip-text);
  font-size: 11.5px; padding: 2px 10px; border-radius: 999px; flex-shrink: 0;
}

/* ===== 一键添加悬浮按钮 ===== */
.fab {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 58px; height: 58px; border-radius: 50%; border: none; cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; font-size: 27px; line-height: 1; box-shadow: var(--glow);
  transition: transform .2s, box-shadow .2s;
}
.fab:hover { transform: scale(1.1); box-shadow: var(--glow); }
.fab:active { transform: scale(.95); }

/* ===== 添加弹窗升级 ===== */
.modal-box { max-width: 460px; }
.modal-label { display: block; font-size: 12.5px; color: var(--muted); margin: 10px 0 4px 2px; }
.modal-label:first-of-type { margin-top: 0; }
.modal-tip { font-size: 12px; color: var(--muted); margin: 4px 2px 0; }
/* 添加单词弹窗:单个添加 / 批量导入模式切换 */
.add-mode-tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.add-mode-tab {
  border: 1px solid var(--border); background: transparent; color: var(--muted);
  border-radius: 999px; padding: 6px 14px; font-size: 13px; cursor: pointer;
  transition: all .15s;
}
.add-mode-tab:hover { border-color: var(--primary); color: var(--primary); }
.add-mode-tab.active { background: var(--primary-bg); border-color: var(--primary); color: var(--primary); font-weight: 600; }
.modal-box textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 11px;
  font-size: 14px; font-family: inherit; background: var(--input-bg); color: var(--text);
  resize: vertical; margin-bottom: 4px; transition: border-color .15s, box-shadow .15s;
}
.modal-box textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .15); outline: none; }

/* 移动端补充 */
@media (max-width: 640px) {
  .word-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-chips { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 6px; -webkit-overflow-scrolling: touch; }
  .cat-chip { flex-shrink: 0; }
  .fab { right: 18px; bottom: 18px; width: 52px; height: 52px; font-size: 24px; }
}

/* ===== 主题配色面板 ===== */
.theme-wrap { position: relative; }
.theme-panel {
  position: absolute; top: calc(100% + 10px); right: 0; width: 228px; z-index: 60;
  background: var(--card-solid); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border); border-radius: 16px; padding: 14px;
  box-shadow: var(--shadow-lg);
  opacity: 0; transform: translateY(-6px) scale(.96); pointer-events: none;
  transition: opacity .18s, transform .18s;
}
.theme-panel.open { opacity: 1; transform: none; pointer-events: auto; }
.theme-panel-title { font-size: 13px; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.theme-swatches { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.theme-swatch {
  display: flex; flex-direction: column; align-items: center; gap: 5px;
  background: none; border: none; cursor: pointer; font-family: inherit; padding: 4px 0;
}
.theme-swatch-dot {
  width: 34px; height: 34px; border-radius: 50%;
  border: 2px solid transparent; box-shadow: inset 0 0 0 2px var(--card-solid);
  transition: transform .15s, border-color .15s;
}
.theme-swatch:hover .theme-swatch-dot { transform: scale(1.12); }
.theme-swatch.active .theme-swatch-dot { border-color: var(--text); }
.theme-swatch-name { font-size: 11.5px; color: var(--muted); }
.theme-swatch.active .theme-swatch-name { color: var(--text); font-weight: 700; }
.theme-panel-divider { height: 1px; background: var(--border); margin: 12px 0; }
.theme-dark-btn {
  width: 100%; padding: 9px; border-radius: 10px; cursor: pointer; font-family: inherit;
  font-size: 13px; border: 1px solid var(--border); background: var(--input-bg); color: var(--text);
  transition: border-color .15s, transform .1s;
}
.theme-dark-btn:hover { border-color: var(--primary); }
.theme-dark-btn:active { transform: scale(.98); }
/* ===== 5 套简约配色(亮色) ===== */
body[data-accent='haze'] {
  --primary: #6b7f9e; --primary-2: #8fa3bd; --primary-dark: #50617d; --primary-light: #bdc8d8;
  --primary-bg: rgba(107, 127, 158, .08); --accent: #8a6f5a; --accent-bg: rgba(138, 111, 90, .07);
  --glow: 0 4px 14px rgba(107, 127, 158, .22);
  background: linear-gradient(180deg, #f5f7fa, #e9edf3);
}
body[data-accent='pine'] {
  --primary: #4d7c6f; --primary-2: #7a9e90; --primary-dark: #3a6056; --primary-light: #a9c3b9;
  --primary-bg: rgba(77, 124, 111, .08); --accent: #9c7a4d; --accent-bg: rgba(156, 122, 77, .07);
  --glow: 0 4px 14px rgba(77, 124, 111, .22);
  background: linear-gradient(180deg, #f4f7f5, #e9efeb);
}
body[data-accent='latte'] {
  --primary: #a68b6b; --primary-2: #c0a988; --primary-dark: #8a7257; --primary-light: #d8c8ae;
  --primary-bg: rgba(166, 139, 107, .08); --accent: #7a6a55; --accent-bg: rgba(122, 106, 85, .07);
  --glow: 0 4px 14px rgba(166, 139, 107, .22);
  background: linear-gradient(180deg, #faf7f2, #f1ebe1);
}
body[data-accent='graphite'] {
  --primary: #4b5563; --primary-2: #6b7280; --primary-dark: #374151; --primary-light: #a8b0bb;
  --primary-bg: rgba(75, 85, 99, .08); --accent: #8d7b6b; --accent-bg: rgba(141, 123, 107, .07);
  --glow: 0 4px 14px rgba(75, 85, 99, .22);
  background: linear-gradient(180deg, #f6f7f8, #ebedef);
}
body[data-accent='mauve'] {
  --primary: #7d7a9e; --primary-2: #9d9ab8; --primary-dark: #615e7d; --primary-light: #c2bfd8;
  --primary-bg: rgba(125, 122, 158, .08); --accent: #8a7f7f; --accent-bg: rgba(138, 127, 127, .07);
  --glow: 0 4px 14px rgba(125, 122, 158, .22);
  background: linear-gradient(180deg, #f6f5f9, #eceaf1);
}

/* ===== 5 套简约配色(深色) ===== */
body.dark[data-accent='haze'] {
  --primary: #9db1c8; --primary-2: #b5c4d5; --primary-dark: #c8d4e0; --primary-light: #50617d;
  --primary-bg: rgba(157, 177, 200, .14); --accent: #b0967f; --accent-bg: rgba(176, 150, 127, .12);
  --glow: 0 4px 14px rgba(0, 0, 0, .3);
  background: linear-gradient(180deg, #161b23, #1d232c);
}
body.dark[data-accent='pine'] {
  --primary: #7fa894; --primary-2: #9dbcaa; --primary-dark: #b8cfc3; --primary-light: #3a6056;
  --primary-bg: rgba(127, 168, 148, .14); --accent: #b08d5f; --accent-bg: rgba(176, 141, 95, .12);
  --glow: 0 4px 14px rgba(0, 0, 0, .3);
  background: linear-gradient(180deg, #141a17, #1b2320);
}
body.dark[data-accent='latte'] {
  --primary: #c0a988; --primary-2: #d2bda1; --primary-dark: #ddcdb4; --primary-light: #8a7257;
  --primary-bg: rgba(192, 169, 136, .14); --accent: #96856f; --accent-bg: rgba(150, 133, 111, .12);
  --glow: 0 4px 14px rgba(0, 0, 0, .3);
  background: linear-gradient(180deg, #1c1915, #24201a);
}
body.dark[data-accent='graphite'] {
  --primary: #8a93a0; --primary-2: #a0a8b3; --primary-dark: #b8bfc8; --primary-light: #374151;
  --primary-bg: rgba(138, 147, 160, .14); --accent: #a39281; --accent-bg: rgba(163, 146, 129, .12);
  --glow: 0 4px 14px rgba(0, 0, 0, .3);
  background: linear-gradient(180deg, #16181b, #1d2024);
}
body.dark[data-accent='mauve'] {
  --primary: #a29fb8; --primary-2: #b8b5c9; --primary-dark: #cbc9da; --primary-light: #615e7d;
  --primary-bg: rgba(162, 159, 184, .14); --accent: #a39494; --accent-bg: rgba(163, 148, 148, .12);
  --glow: 0 4px 14px rgba(0, 0, 0, .3);
  background: linear-gradient(180deg, #1a1920, #211f27);
}

/* ===== 每日学习目标(首页概览第 4 卡) ===== */
.goal-card { cursor: pointer; }
.goal-card:hover { border-color: var(--green); }
.goal-bar {
  height: 5px; background: var(--primary-bg); border-radius: 999px;
  overflow: hidden; margin-top: 8px;
}
.goal-bar i {
  display: block; height: 100%; width: 0; border-radius: 999px;
  background: linear-gradient(90deg, var(--green), #34d399); transition: width .4s ease;
}
.goal-card.goal-done { border-color: var(--green); }
.goal-card.goal-done .stat-num { color: var(--green); -webkit-text-fill-color: var(--green); }

/* ===== 查词搜索弹窗 ===== */
.search-box { max-width: 520px; }
.search-box input { margin-bottom: 12px; }
.search-results {
  max-height: 52vh; overflow-y: auto;
  display: flex; flex-direction: column; gap: 8px; margin-bottom: 6px;
}
.search-item {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 9px 12px; box-shadow: var(--shadow);
}
.search-ru {
  font-weight: 700; font-size: 16px; color: var(--primary-dark);
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.search-zh { font-size: 14px; }
.search-meta {
  font-size: 11px; padding: 1px 8px; border-radius: 999px;
  background: var(--primary-bg); color: var(--primary);
}
.s-state { font-size: 11px; padding: 1px 8px; border-radius: 999px; }
.s-state.s-mastered { background: var(--green-bg); color: var(--green); }
.s-state.s-learning { background: var(--tip-bg); color: var(--tip-text); }
.search-ex {
  flex-basis: 100%; font-size: 12.5px; padding: 6px 10px;
  background: var(--primary-bg); border-radius: 8px;
}
.search-ex-ru { font-weight: 600; }
.search-ex-zh { color: var(--muted); margin-left: 8px; }
.search-count { text-align: center; color: var(--muted); font-size: 12px; margin-top: 2px; }

/* ===== 页脚数据导出 / 导入 ===== */
.footer-ops { display: inline-flex; gap: 8px; margin-left: 10px; }
.footer-ops a {
  color: var(--muted); text-decoration: none;
  border-bottom: 1px dashed var(--muted); transition: color .15s, border-color .15s;
}
.footer-ops a:hover { color: var(--primary); border-color: var(--primary); }

/* ===== 学习统计趋势图(打卡页) =====
   图表系列色为验证过的色盲安全配色(浅色 / 深色两套),不随 6 套主题变化 */
:root {
  --chart-new: #3571ad;    /* 每日新学(蓝) */
  --chart-review: #ad5f45; /* 每日复习(暖棕) */
}
body.dark {
  --chart-new: #5585bf;
  --chart-review: #cc7d63;
}
.stats-panel { margin-top: 34px; }
.stats-panel .sub-tip { margin: 0 0 2px; }
.chart-legend {
  display: flex; gap: 18px; justify-content: center;
  margin-bottom: 10px; font-size: 13px; color: var(--muted);
}
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.legend-dot { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.chart-wrap {
  position: relative;
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 16px 14px 8px; box-shadow: var(--shadow);
}
.chart-wrap svg { width: 100%; height: auto; display: block; }
.bar-slot { cursor: pointer; }
.bar-slot:hover .bar-new, .bar-slot:hover .bar-rev { filter: brightness(1.12); }
.chart-tip {
  position: absolute; z-index: 10; pointer-events: none;
  background: rgba(15, 21, 40, .9); color: #fff; font-size: 12px;
  padding: 6px 10px; border-radius: 8px; box-shadow: var(--shadow-lg);
  white-space: nowrap;
}
body.dark .chart-tip { background: rgba(227, 230, 236, .94); color: #14171d; }
.chart-summary {
  display: flex; gap: 24px; justify-content: center; flex-wrap: wrap;
  margin-top: 12px; font-size: 13px; color: var(--muted);
}
.chart-summary b { color: var(--text); font-size: 15px; font-variant-numeric: tabular-nums; }
.stats-detail {
  margin-top: 14px; background: var(--card); border: 1px solid var(--border);
  border-radius: 13px; box-shadow: var(--shadow); overflow: hidden;
}
.stats-detail summary {
  padding: 10px 16px; cursor: pointer; font-size: 13px; color: var(--muted);
  list-style: none; transition: background .15s;
}
.stats-detail summary:hover { background: var(--primary-bg); }
.stats-detail summary::-webkit-details-marker { display: none; }
.stats-detail summary::after { content: '▾'; float: right; }
.stats-detail[open] summary::after { content: '▴'; }
.stats-table { max-height: 260px; overflow-y: auto; padding: 0 14px 12px; }
.stats-table table { width: 100%; border-collapse: collapse; font-size: 13px; }
.stats-table th, .stats-table td {
  border-bottom: 1px solid var(--border); padding: 6px 8px; text-align: center;
  font-variant-numeric: tabular-nums;
}
.stats-table th {
  color: var(--muted); font-weight: 600;
  position: sticky; top: 0; background: var(--card-solid);
}
.stats-empty { text-align: center; color: var(--muted); padding: 30px 14px; font-size: 14px; }

/* ========== 开场动画(描边勾勒版:书页线条自绘 → 声波弹性升起 → 字距展开) ========== */
.splash {
  position: fixed; inset: 0; z-index: 999;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: linear-gradient(180deg, #f7f8fa, #eef0f4);
  cursor: pointer;
  transition: opacity .6s cubic-bezier(.4, 0, .2, 1), visibility .6s,
    transform .6s cubic-bezier(.4, 0, .2, 1), filter .6s ease;
  /* 纯 CSS 兜底:即使脚本失败 2.6s 后也自动淡出 */
  animation: splashAutoHide .6s ease 2.6s forwards;
}
body.dark .splash { background: linear-gradient(180deg, #14171d, #1b1f26); }
/* 中心微光:跟随主题主色的极淡径向光晕,缓慢浮现 */
.splash::before {
  content: ''; position: absolute; inset: -20%; pointer-events: none;
  background: radial-gradient(430px 430px at 50% 42%, color-mix(in srgb, var(--primary) 12%, transparent), transparent 66%);
  opacity: 0; animation: glowIn 1.2s ease .25s both;
}
@keyframes glowIn { to { opacity: 1; } }
.splash.hide {
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: scale(1.035); filter: blur(6px); /* 退场:轻微放大 + 模糊,沉入页面 */
}
.splash-logo {
  width: 76px; height: 76px; border-radius: 22px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--glow);
  animation: splashPop .7s cubic-bezier(.34, 1.56, .64, 1) both;
}
.splash-logo svg { display: block; }
/* 书页线条:stroke 描边自绘,左右两页先后勾勒 */
.splash-logo .book-l, .splash-logo .book-r {
  stroke-dasharray: 100; stroke-dashoffset: 100;
  animation: drawBook .85s cubic-bezier(.65, 0, .35, 1) .05s forwards;
}
.splash-logo .book-r { animation-delay: .18s; }
@keyframes drawBook { to { stroke-dashoffset: 0; } }
/* 声波条:书页成形后依次弹性升起(一次性,不循环) */
.splash-logo .wave {
  transform-box: fill-box; transform-origin: 50% 100%;
  animation: waveRise .5s cubic-bezier(.34, 1.56, .64, 1) backwards;
}
.splash-logo .w1 { animation-delay: .42s; }
.splash-logo .w2 { animation-delay: .55s; }
.splash-logo .w3 { animation-delay: .63s; }
@keyframes waveRise { from { transform: scaleY(.15); opacity: 0; } to { transform: scaleY(1); opacity: 1; } }
/* 品牌名:字距由宽收窄 + 缓缓浮现 */
.splash-name {
  margin-top: 24px;
  font-size: 19px; font-weight: 700;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  letter-spacing: .14em; text-indent: .14em;
  animation: nameIn 1s cubic-bezier(.22, .61, .36, 1) .78s both;
}
@keyframes nameIn {
  from { opacity: 0; letter-spacing: .55em; text-indent: .55em; transform: translateY(5px); }
  to { opacity: 1; letter-spacing: .14em; text-indent: .14em; transform: none; }
}
/* 品牌名下方细线:自中心向两侧展开 */
.splash-line {
  width: 88px; height: 1px; margin-top: 12px; border-radius: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  transform: scaleX(0);
  animation: lineIn .7s cubic-bezier(.22, .61, .36, 1) 1.02s both;
}
@keyframes lineIn { to { transform: scaleX(1); } }
.splash-tag {
  margin-top: 14px;
  font-size: 12.5px; color: var(--muted); letter-spacing: 2px;
  animation: fadeUp .55s ease 1.16s both;
}
.splash-hint {
  position: absolute; bottom: 34px; left: 0; right: 0; text-align: center;
  font-size: 11.5px; color: var(--muted); opacity: .55;
  animation: fadeUp .55s ease 1.3s both;
}
@keyframes splashPop { from { transform: scale(.55); opacity: 0; } to { transform: scale(1); opacity: 1; } }
@keyframes fadeUp { from { transform: translateY(12px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes splashAutoHide { to { opacity: 0; visibility: hidden; transform: scale(1.035); filter: blur(6px); } }
/* 快速模式:同标签页内切换页面时不重播动画,直接显示完整画面并快速淡出 */
.splash.fast .splash-logo,
.splash.fast .splash-logo .wave,
.splash.fast .book-l,
.splash.fast .book-r,
.splash.fast .splash-name,
.splash.fast .splash-line,
.splash.fast .splash-tag,
.splash.fast .splash-hint { animation: none; }
.splash.fast .book-l, .splash.fast .book-r { stroke-dashoffset: 0; }
.splash.fast .splash-line { transform: scaleX(1); }

/* ===== 拼写双模式切换(2026-09-04) ===== */
.spell-mode-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 14px; }
.spell-mode-tab {
  border: 1px solid var(--border); background: transparent; color: var(--muted);
  border-radius: 999px; padding: 7px 16px; font-size: 13.5px; cursor: pointer; font-family: inherit;
  transition: all .15s;
}
.spell-mode-tab:hover { border-color: var(--primary); color: var(--primary); }
.spell-mode-tab.active {
  background: var(--primary-bg); border-color: var(--primary); color: var(--primary);
  font-weight: 600;
}

/* ===== 重音练习(口语页,2026-09-04) ===== */
.stress-word {
  font-size: 40px; font-weight: 700; letter-spacing: 1px; text-align: center;
  color: var(--primary-dark);
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.stress-options { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin: 16px 0 10px; }
.stress-opt {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  border-radius: 12px; padding: 10px 18px; font-size: 14px; cursor: pointer; font-family: inherit;
  transition: all .15s; box-shadow: var(--shadow);
}
.stress-opt:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.stress-opt:disabled { opacity: .6; cursor: default; }

/* ===== 磨耳朵弹窗(2026-09-04) ===== */
.panel-head-right { display: flex; align-items: center; gap: 12px; }
.ear-box { max-width: 400px; }
.ear-now { text-align: center; margin: 6px 0 2px; }
.ear-ru {
  font-size: 34px; font-weight: 700; letter-spacing: .5px;
  color: var(--primary-dark);
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.ear-zh { font-size: 20px; font-weight: 600; }
.ear-progress { text-align: center; color: var(--muted); font-size: 13px; margin: 6px 0 14px; }
.ear-controls { display: flex; gap: 10px; justify-content: center; margin-bottom: 16px; }
.ear-controls .btn { min-width: 108px; }
.ear-settings { display: flex; gap: 14px; align-items: center; justify-content: center; flex-wrap: wrap; margin-bottom: 6px; }
.ear-settings label { font-size: 12.5px; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.ear-settings select {
  border: 1px solid var(--border); background: var(--input-bg); color: var(--text);
  border-radius: 9px; padding: 5px 8px; font-size: 13px; font-family: inherit; cursor: pointer;
}

/* ===== 每日一词(首页,2026-09-04) ===== */
.daily-word {
  max-width: 560px; margin: 0 auto 30px;
  background: var(--card); border: 1px solid var(--border); border-radius: 20px;
  padding: 26px 30px 24px; position: relative;
  box-shadow: var(--inset-hl), var(--shadow-md);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.daily-word-main { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.daily-word-ru {
  font-size: 42px; font-weight: 700; letter-spacing: .5px; text-align: center;
  color: var(--primary-dark);
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
}
.daily-word-zh { font-size: 24px; font-weight: 600; letter-spacing: .5px; }
.daily-word-meta { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: center; }
.daily-word-note { font-size: 12px; color: var(--muted); }
.daily-word-ex { margin-top: 14px; }
.daily-word-actions { margin-top: 16px; text-align: center; }
.daily-word-actions .btn.done { background: var(--green); opacity: .75; }

/* ===== 移动端增强(手机/平板,2026-09-04) ===== */
@media (max-width: 640px) {
  .container { padding: 22px 14px 56px; }
  .header-inner { gap: 10px; }
  .brand-logo svg { width: 38px; height: 38px; }
  .brand-text h1 { font-size: 17px; }
  .brand-text p { display: none; } /* 手机上隐藏标语,更清爽 */
  .header-right { gap: 8px; }
  .theme-toggle { width: 36px; height: 36px; font-size: 16px; }
  .lang-select { padding: 6px 26px 6px 10px; font-size: 13px; }
  .modal { padding: 12px; }
  .modal-box { padding: 22px 18px; max-height: 86vh; overflow-y: auto; border-radius: 18px; }
  .modal-box h3 { font-size: 17px; }
  .flashcard { height: 285px; }
  .flashcard.has-ex { height: 400px; }
  .flashcard-face { padding: 20px 16px; border-radius: 18px; }
  .hero { padding: 22px 18px; gap: 14px; }
  .hero-main h2 { font-size: 21px; }
  .panel-head h2 { font-size: 20px; }
  .stats-table { font-size: 11.5px; }
  .stats-table th, .stats-table td { padding: 6px; }
  .chart-summary { gap: 6px 14px; flex-wrap: wrap; }
  .site-footer { padding: 12px 10px; line-height: 1.8; }
  .footer-ops { display: block; margin-top: 4px; }
  .search-box .search-item { padding: 10px; }
  .splash-name { font-size: 17px; }
  .splash-tag { font-size: 11.5px; letter-spacing: 1.5px; }
  .daily-word { padding: 20px 16px; }
  .daily-word-ru { font-size: 34px; }
  .daily-word-zh { font-size: 20px; }
}
@media (max-width: 380px) {
  .hero-stats { gap: 8px; }
  .stat-card { padding: 12px 8px; min-width: 0; }
  .stat-num { font-size: 24px; }
}

/* ========== 成就徽章(打卡页徽章墙) ========== */
.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; }
.badge {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 14px 10px 12px; text-align: center;
  opacity: .45; filter: grayscale(.85); transition: opacity .25s, transform .25s, filter .25s;
}
.badge.earned { opacity: 1; filter: none; }
.badge.earned:hover { transform: translateY(-2px); }
.badge-emoji { font-size: 26px; line-height: 1.2; }
.badge.earned .badge-emoji { animation: badge-pop .5s ease; }
@keyframes badge-pop { 0% { transform: scale(.4); } 70% { transform: scale(1.25); } 100% { transform: scale(1); } }
.badge-name { font-weight: 700; font-size: 13px; margin-top: 6px; color: var(--text); }
.badge-desc { font-size: 11px; color: var(--muted); margin-top: 3px; line-height: 1.4; }

/* 错词本「重练中」进度标签 */
.book-retrain {
  font-size: 11px; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  padding: 2px 8px; border-radius: 999px; white-space: nowrap;
}