:root {
  --bg: #0f1220;
  --bg2: #141829;
  --panel: #1b2036;
  --panel2: #222843;
  --text: #e7e9f3;
  --muted: #9aa0b8;
  --accent: #4cc3a0;
  --accent2: #4c9fe0;
  --danger: #e0556b;
  --warn: #e0b34c;
  --border: rgba(255,255,255,0.08);
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0,0,0,0.35);
}
/* 高对比度 */
:root[data-hc="1"] {
  --bg: #000; --bg2: #000; --panel: #0a0a0a; --panel2: #141414;
  --text: #fff; --muted: #d0d0d0; --border: rgba(255,255,255,0.4);
}
/* 色盲友好：强调用文字标签，配色已在 JS 切换 */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: radial-gradient(1200px 600px at 70% -10%, #1a2138 0%, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--accent); color: #04201a;
  padding: 8px 14px; border-radius: 8px; z-index: 50;
}
.skip-link:focus { left: 12px; top: 12px; }
:focus-visible { outline: 2px solid var(--accent2); outline-offset: 2px; border-radius: 6px; }

/* 顶栏 */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 20; background: rgba(15,18,32,0.82); backdrop-filter: blur(8px);
}
.brand { font-size: 20px; font-weight: 800; letter-spacing: .5px; }
.brand span { color: var(--accent); }
.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav-link {
  padding: 8px 14px; border-radius: 10px; color: var(--muted); font-size: 14px; font-weight: 600;
  transition: background .15s, color .15s;
}
.nav-link:hover { background: var(--panel2); color: var(--text); }
.nav-link.active { background: var(--accent); color: #04201a; }

.view { max-width: 920px; margin: 0 auto; padding: 26px 18px 80px; }

/* 通用按钮 */
button { font-family: inherit; cursor: pointer; border: none; border-radius: 10px; font-size: 14px; }
.btn-primary { background: var(--accent); color: #04201a; font-weight: 700; padding: 11px 20px; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: var(--panel2); color: var(--text); padding: 11px 18px; font-weight: 600; }
.btn-ghost:hover { background: #2c3458; }
.btn-mini { background: var(--panel2); color: var(--text); padding: 5px 10px; font-size: 12px; margin-left: 6px; }
.btn-mini.danger { color: var(--danger); }
.btn-mini:hover { filter: brightness(1.15); }

/* Hero */
.hero { text-align: center; padding: 30px 0 18px; }
.hero h1 { font-size: 30px; margin: 0 0 8px; }
.hero-sub { color: var(--muted); margin: 0 0 22px; font-size: 15px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* 概览卡片 */
.dash { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 8px 0 22px; }
.dash-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; text-align: center; }
.dc-val { font-size: 26px; font-weight: 800; color: var(--accent); }
.dc-label { color: var(--muted); font-size: 12px; margin-top: 4px; }

/* 面板 */
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; margin-bottom: 20px; box-shadow: var(--shadow); }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.panel-head h2 { margin: 0; font-size: 20px; }
.panel-sub { color: var(--muted); font-size: 13px; margin: 4px 0 12px; }
.tag-done { color: var(--accent); font-weight: 700; font-size: 13px; }
.tag-todo { color: var(--warn); font-weight: 700; font-size: 13px; }

/* 排行榜 */
.lb { display: flex; flex-direction: column; gap: 6px; }
.lb-row { display: flex; align-items: center; gap: 12px; background: var(--panel2); border-radius: 10px; padding: 10px 14px; }
.lb-row.me { outline: 1px solid var(--accent); }
.lb-rank { width: 22px; text-align: center; color: var(--muted); font-weight: 700; }
.lb-name { flex: 1; font-weight: 600; }
.lb-wpm { color: var(--accent); font-weight: 700; }

/* 课程网格 */
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.course-card { background: var(--panel2); border: 1px solid var(--border); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.cc-level { font-size: 11px; color: var(--accent2); font-weight: 700; letter-spacing: 1px; }
.course-card h3 { margin: 0; font-size: 17px; }
.course-card p { margin: 0; color: var(--muted); font-size: 13px; flex: 1; }
.cc-diff { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.cc-stepper { display: inline-flex; align-items: center; gap: 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.cc-stepper button { background: var(--panel); color: var(--text); padding: 4px 12px; font-size: 16px; }
.cc-stepper button:hover { background: var(--accent); color: #04201a; }
.cc-stepper span { min-width: 30px; text-align: center; font-weight: 700; }
.cc-hint { font-size: 11px; }

/* 指法图谱 */
.finger-tips { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 6px 18px; margin: 18px 0; font-size: 13px; color: var(--muted); }
.finger-tips b { color: var(--text); }

/* 虚拟键盘 */
.vk { display: flex; flex-direction: column; gap: 6px; align-items: center; margin: 14px 0; user-select: none; }
.vk-row { display: flex; gap: 6px; }
.vk-key {
  position: relative; width: 42px; height: 42px; border-radius: 8px;
  background: rgba(255,255,255,0.06); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 600; color: var(--text);
  transition: transform .08s, background .12s, box-shadow .12s;
}
.vk-key.vk-fingered { border-color: var(--fk); background: color-mix(in srgb, var(--fk) 22%, transparent); }
.vk-space { width: 240px; }
.vk-label { pointer-events: none; }
.vk-finger { position: absolute; right: 4px; bottom: 2px; font-size: 9px; color: var(--muted); font-weight: 700; }

.vk-key.next {
  box-shadow: 0 0 0 3px var(--fk), 0 0 18px var(--fk);
  transform: translateY(-2px);
  animation: vkpulse 1s ease-in-out infinite;
}
@keyframes vkpulse { 50% { box-shadow: 0 0 0 2px var(--fk), 0 0 8px var(--fk); } }
.vk-key.flash-ok { background: #2faa6a !important; color: #fff; }
.vk-key.flash-bad { background: var(--danger) !important; color: #fff; animation: shake .2s; }
@keyframes shake { 25% { transform: translateX(-3px); } 75% { transform: translateX(3px); } }

.vk-chart .vk-key { width: 46px; height: 46px; }
.vk-chart .vk-finger { color: #fff; background: rgba(0,0,0,0.25); border-radius: 4px; padding: 0 3px; }
.vk-legend { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 16px; justify-content: center; }
.vk-legend-item { display: flex; align-items: center; gap: 7px; font-size: 13px; }
.vk-swatch { width: 16px; height: 16px; border-radius: 4px; display: inline-block; }
.vk-heat .vk-key { width: 40px; height: 40px; }

/* 练习区 */
.pr-top { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.pr-title { font-size: 16px; font-weight: 700; }
.pr-mount { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.pr-stats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-bottom: 16px; }
.pr-stat { background: var(--panel2); border-radius: 10px; padding: 10px; text-align: center; position: relative; }
.pr-stat-label { font-size: 11px; color: var(--muted); }
.pr-stat-val { font-size: 20px; font-weight: 800; color: var(--accent); margin-top: 2px; }
.pr-combo .pr-stat-val { color: var(--warn); }
.pr-combo-bar { height: 5px; background: rgba(255,255,255,0.1); border-radius: 3px; margin-top: 6px; overflow: hidden; }
.pr-combo-bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #e0b34c, #e0556b); transition: width .15s; }

.pr-text {
  font-size: 22px; line-height: 1.9; letter-spacing: .5px;
  background: var(--bg2); border-radius: 12px; padding: 18px 20px; min-height: 130px;
  cursor: text; user-select: none; white-space: pre-wrap; word-break: break-word;
  max-height: 240px; overflow-y: auto;
}
.pr-ch { border-radius: 4px; padding: 0 1px; transition: background .06s, color .06s; }
.pr-ch.pending { color: var(--muted); }
.pr-ch.correct { color: var(--text); background: rgba(76,195,160,0.22); }
.pr-ch.wrong { color: #fff; background: rgba(224,85,107,0.55); }
.pr-ch.current { background: rgba(224,179,76,0.45); box-shadow: 0 2px 0 var(--warn); }
.pr-ch.current.wrong { background: rgba(224,85,107,0.6); box-shadow: 0 2px 0 var(--danger); }
.pr-hint { text-align: center; color: var(--muted); font-size: 13px; margin: 12px 0; min-height: 18px; }
.pr-kb { display: flex; justify-content: center; }
.pr-foot { display: flex; align-items: center; gap: 14px; margin-top: 14px; flex-wrap: wrap; }
.pr-rest { color: var(--warn); font-size: 13px; }
.pr-hidden { position: absolute; opacity: 0; width: 1px; height: 1px; left: -9999px; top: -9999px; }

.pr-overlay {
  position: fixed; inset: 0; background: rgba(8,10,20,0.82); display: flex; align-items: center; justify-content: center;
  z-index: 40; padding: 20px; animation: fade .2s;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.pr-result { background: var(--panel); border: 1px solid var(--border); border-radius: 18px; padding: 28px 30px; max-width: 380px; width: 100%; text-align: center; box-shadow: var(--shadow); }
.pr-result h2 { margin: 0 0 16px; color: var(--accent); }
.pr-result-rows { display: flex; flex-direction: column; gap: 8px; }
.prr-row { display: flex; justify-content: space-between; font-size: 15px; }
.prr-row b { color: var(--accent); }
.pr-comment { margin: 14px 0; color: var(--text); font-size: 14px; background: var(--panel2); border-radius: 10px; padding: 10px; }
.pr-badges { margin: 12px 0; }
.pr-badges-title { color: var(--warn); font-weight: 700; margin-bottom: 6px; }
.badge-new { display: inline-block; background: var(--warn); color: #2a1d00; font-weight: 700; border-radius: 20px; padding: 4px 12px; margin: 3px; font-size: 13px; }
.pr-result-actions { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }

/* 统计仪表盘 */
.st-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 20px; }
.st-card { background: var(--panel2); border-radius: 12px; padding: 14px; text-align: center; }
.st-card-val { font-size: 22px; font-weight: 800; color: var(--accent); }
.st-card-label { color: var(--muted); font-size: 12px; margin-top: 4px; }
.st-charts { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 20px; }
.st-chart-box { background: var(--panel2); border-radius: 12px; padding: 14px; }
.st-chart-box h3 { margin: 0 0 10px; font-size: 14px; color: var(--muted); }
.st-chart-box canvas { width: 100%; display: block; }
.st-section { margin-bottom: 20px; }
.st-section h3 { font-size: 16px; margin: 0 0 6px; }
.st-sub { color: var(--muted); font-size: 13px; margin: 4px 0 10px; }
.st-recent { display: flex; flex-direction: column; gap: 6px; }
.st-row { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 0.6fr; gap: 8px; align-items: center; background: var(--panel2); border-radius: 8px; padding: 8px 12px; font-size: 13px; }
.st-wpm { color: var(--accent); font-weight: 700; }
.st-acc { color: var(--warn); font-weight: 700; }

/* 徽章 */
.badges-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.badge { background: var(--panel2); border: 1px solid var(--border); border-radius: 12px; padding: 14px; opacity: .55; }
.badge.got { opacity: 1; border-color: var(--accent); }
.badge-name { font-weight: 700; }
.badge-desc { color: var(--muted); font-size: 12px; margin: 4px 0 8px; }
.badge-flag { font-size: 11px; color: var(--muted); }
.badge.got .badge-flag { color: var(--accent); font-weight: 700; }

/* 设置 */
.st-h { margin: 22px 0 10px; font-size: 16px; }
.prof-current { font-size: 14px; color: var(--muted); margin-bottom: 10px; }
.prof-current b { color: var(--text); }
.prof-list { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.prof-item { display: flex; align-items: center; justify-content: space-between; background: var(--panel2); border-radius: 10px; padding: 10px 14px; }
.prof-item.me { outline: 1px solid var(--accent); }
.prof-ops { display: flex; gap: 4px; }
.prof-new { display: flex; gap: 8px; }
.prof-new input { flex: 1; background: var(--bg2); border: 1px solid var(--border); color: var(--text); border-radius: 10px; padding: 10px 12px; font-size: 14px; }

.set-toggle { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--border); }
.set-toggle b { font-size: 14px; }
.set-toggle small { color: var(--muted); font-size: 12px; }
.set-toggle input { width: 42px; height: 24px; appearance: none; background: var(--panel2); border-radius: 14px; position: relative; cursor: pointer; transition: background .15s; flex: none; }
.set-toggle input:checked { background: var(--accent); }
.set-toggle input::after { content: ""; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%; background: #fff; transition: left .15s; }
.set-toggle input:checked::after { left: 21px; }

.set-slider { margin-top: 16px; }
.set-slider label { font-size: 14px; }
.set-slider input[type="range"] { width: 100%; margin-top: 8px; accent-color: var(--accent); }

/* 响应式 */
@media (max-width: 720px) {
  .dash, .st-cards { grid-template-columns: repeat(2, 1fr); }
  .st-charts { grid-template-columns: 1fr; }
  .pr-stats { grid-template-columns: repeat(3, 1fr); }
  .vk-key { width: 30px; height: 34px; font-size: 12px; }
  .vk-space { width: 150px; }
  .vk-chart .vk-key, .vk-heat .vk-key { width: 32px; height: 34px; }
  .pr-text { font-size: 18px; }
  .hero h1 { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}