:root {
  --bg:#f3f7ff;
  --bg2:#e8eefc;
  --panel:#ffffff;
  --panel2:#f8fbff;
  --line:rgba(15,23,42,.10);
  --line-strong:rgba(15,23,42,.18);
  --text:#0f172a;
  --muted:#475569;
  --accent:#2563eb;
  --accent2:#7c3aed;
  --good:#059669;
  --warn:#d97706;
  --bad:#dc2626;
  --shadow:0 18px 44px rgba(15,23,42,.10);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC",Inter,system-ui,sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at top left, rgba(37,99,235,.08), transparent 28%),
    radial-gradient(circle at top right, rgba(124,58,237,.08), transparent 30%),
    linear-gradient(135deg,var(--bg),var(--bg2) 55%,#f8fbff);
}
button,input{font:inherit}
.app{display:grid;grid-template-columns:330px 1fr;min-height:100vh}
.sidebar{padding:18px;border-right:1px solid var(--line);background:rgba(255,255,255,.82);backdrop-filter:blur(12px);display:flex;flex-direction:column;gap:14px}
.content{padding:22px;display:flex;flex-direction:column;gap:18px}
.card{background:linear-gradient(180deg,rgba(255,255,255,.98),rgba(248,251,255,.98));border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}
.glass{backdrop-filter:blur(10px)}
.brand{padding:18px}.brand-top{display:flex;gap:14px;align-items:center}.brand-mark{width:46px;height:46px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#ffffff;font-weight:800;font-size:24px}
.brand h1{margin:0 0 4px;font-size:24px}.muted{color:var(--muted)}
.search-wrap{margin-top:14px}
.search-wrap input{width:100%;padding:14px 16px;border-radius:14px;border:1px solid var(--line-strong);background:#ffffff;color:var(--text);outline:none;transition:.18s ease}
.search-wrap input:focus{border-color:rgba(37,99,235,.45);box-shadow:0 0 0 4px rgba(37,99,235,.08)}
.progress-panel{margin-top:14px}.row{display:flex;align-items:center;gap:12px}.between{justify-content:space-between}
.progress{height:10px;border-radius:999px;background:rgba(255,255,255,.08);overflow:hidden;margin:10px 0 0}.progress>div{height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:999px;transition:width .25s ease}
.stats-row{margin-top:12px;display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stats-row>div{padding:10px 12px;border-radius:14px;background:#f8fbff;border:1px solid var(--line);display:flex;flex-direction:column;gap:4px}.stats-row strong{font-size:18px}
.nav-header{padding:0 4px}.mini-btn,.btn{border:none;cursor:pointer;border-radius:14px}.mini-btn{padding:8px 10px;background:#ffffff;color:var(--text);border:1px solid var(--line-strong)}
.module-nav{display:grid;gap:10px;overflow:auto;padding-right:4px}
.nav-item{padding:14px;border-radius:18px;border:1px solid var(--line);background:#ffffff;text-align:left;cursor:pointer;transition:.18s ease}
.nav-item:hover{transform:translateY(-1px);border-color:rgba(37,99,235,.32)}
.nav-item.active{border-color:rgba(37,99,235,.5);box-shadow:0 0 0 1px rgba(37,99,235,.12) inset}
.nav-item h3{margin:0 0 6px;font-size:16px;line-height:1.35}.nav-item .meta{margin-top:10px;display:flex;justify-content:space-between;color:var(--muted);font-size:13px}
.pill{font-size:12px;padding:5px 10px;border-radius:999px;background:rgba(124,58,237,.10);color:#5b21b6;border:1px solid rgba(124,58,237,.14)}
.hero{padding:22px;display:flex;justify-content:space-between;gap:16px;align-items:flex-start;flex-wrap:wrap}
.hero h2{margin:6px 0 8px;font-size:30px;line-height:1.2}.eyebrow{font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:#1d4ed8}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.btn{padding:12px 16px;font-weight:700}.btn-primary{background:linear-gradient(90deg,var(--accent),var(--accent2));color:#ffffff}.btn-ghost{background:#ffffff;color:var(--text);border:1px solid var(--line-strong)}
.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.quick-card{padding:18px}.quick-title{font-size:13px;color:var(--muted)}.quick-value{margin:8px 0 6px;font-size:30px;font-weight:800}
.framework-spotlight{padding:20px}
.framework-head h3{margin:4px 0 8px;font-size:28px}
.framework-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:6px}
.framework-card{padding:18px;border-radius:18px;border:1px solid var(--line);background:linear-gradient(180deg,#ffffff,#f8fbff)}
.framework-title{font-size:16px;font-weight:800;margin-bottom:10px;color:var(--accent2)}
.framework-list{font-size:16px;line-height:1.8;color:var(--text)}
.detail-grid{display:grid;grid-template-columns:1.15fr .95fr;gap:18px}.stack{display:grid;gap:18px}.panel{padding:18px 18px 16px}.panel-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.panel-head h3{margin:0;font-size:20px}
.section-badge{font-size:12px;padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.06);border:1px solid var(--line)}
.checklist,.bullet-list{display:grid;gap:10px}.check-row{padding:12px 14px;border-radius:16px;border:1px solid var(--line);background:#ffffff}
.check-row label{display:flex;gap:12px;align-items:flex-start;cursor:pointer}.check-row input{margin-top:3px;accent-color:#67e8f9}.lesson-body strong{display:block;margin-bottom:4px;font-size:15px;line-height:1.45}.lesson-body span{display:block;line-height:1.6}
.practice-card{padding:14px;border:1px solid var(--line);border-radius:16px;background:#fff}
.practice-title{font-size:16px;font-weight:800;margin-bottom:10px;line-height:1.5}
.practice-options{display:grid;gap:8px}
.practice-option{padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:#f8fbff;cursor:pointer;text-align:left}
.practice-option.active{border-color:rgba(37,99,235,.45);background:rgba(37,99,235,.08)}
.practice-result{margin-top:10px;padding-top:10px;border-top:1px dashed var(--line);display:grid;gap:8px}
.result-ok{color:#047857;font-weight:700}
.result-bad{color:#b91c1c;font-weight:700}
.note,.tip,.warn{padding:12px 14px;border-radius:16px;line-height:1.6}.note{background:rgba(37,99,235,.06);border:1px solid rgba(37,99,235,.12)}.tip{background:rgba(5,150,105,.08);border:1px solid rgba(5,150,105,.14)}.warn{background:rgba(220,38,38,.08);border:1px solid rgba(220,38,38,.14)}
.list-chip{display:flex;flex-wrap:wrap;gap:8px}.chip{padding:8px 10px;border-radius:999px;background:#f8fbff;border:1px solid var(--line);font-size:13px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.search-empty{padding:14px;border-radius:16px;background:rgba(217,119,6,.08);border:1px solid rgba(217,119,6,.18);color:#92400e}
.helper{font-size:13px;color:var(--muted)}
@media (max-width:1100px){.quick-grid{grid-template-columns:1fr}.detail-grid{grid-template-columns:1fr}.framework-grid{grid-template-columns:1fr}}
@media (max-width:920px){.app{grid-template-columns:1fr}.sidebar{border-right:none;border-bottom:1px solid var(--line)}.content{padding:16px}.hero h2{font-size:24px}.stats-row{grid-template-columns:1fr 1fr 1fr}}
@media (max-width:560px){.sidebar,.content{padding:14px}.stats-row{grid-template-columns:1fr}.two-col{grid-template-columns:1fr}.hero-actions{width:100%}.hero-actions .btn{flex:1}.framework-head h3{font-size:22px}}