/* ===== 基础：设计变量 / 重置 / 布局 ===== */
:root{
  /* 主题色：清新薄荷青 */
  --teal-900:#164e63;
  --teal-800:#0e7490;
  --teal-700:#0891b2;
  --teal-600:#06b6d4;
  --teal-500:#22d3ee;
  --teal-400:#67e8f9;
  --cyan-500:#06b6d4;

  --bg:#eef2f4;
  --bg-soft:#f4f7f8;
  --surface:#ffffff;
  --surface-2:#f8fafb;

  --ink-1:#0f2024;
  --ink-2:#33454b;
  --ink-3:#5c6f76;
  --ink-4:#8aa0a8;
  --line:#e2e9ec;
  --line-2:#d3dee2;

  /* 语义分类色 */
  --c-xq:#7c3aed;  /* 先期分组 紫 */
  --c-bx:#2563eb;  /* 并项 蓝 */
  --c-fz:#0891b2;  /* 辅助细分 青 */
  --c-jc:#16a34a;  /* 基础 绿 */
  --c-bl:#dc2626;  /* 黑名单 红 */
  --c-amber:#d97706;

  --radius:14px;
  --radius-sm:10px;
  --radius-lg:20px;
  --shadow-sm:0 1px 2px rgba(15,40,44,.05), 0 2px 8px rgba(15,40,44,.05);
  --shadow:0 6px 24px rgba(15,40,44,.08), 0 2px 6px rgba(15,40,44,.05);
  --shadow-lg:0 18px 50px rgba(15,40,44,.18);

  --font:"Noto Sans CJK SC","Source Han Sans SC","PingFang SC","Microsoft YaHei","WenQuanYi Micro Hei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"SFMono-Regular",Consolas,"JetBrains Mono",Menlo,monospace;
  --sidebar-w:248px;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--ink-1);
  font-size:14px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select,textarea{font-family:inherit;font-size:14px;color:var(--ink-1)}
::placeholder{color:var(--ink-4)}
.mono{font-family:var(--mono);font-size:.92em;letter-spacing:-.2px}

/* 滚动条 */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#c3d0d4;border-radius:8px;border:2px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:#9fb4ba;background-clip:content-box;border:2px solid transparent}
::-webkit-scrollbar-track{background:transparent}

/* ===== 整体布局 ===== */
.app{display:flex;min-height:100vh}

/* ===== 侧边栏 ===== */
.sidebar{
  width:var(--sidebar-w);flex-shrink:0;
  background:linear-gradient(180deg,var(--teal-900) 0%,var(--teal-800) 55%,var(--teal-700) 100%);
  color:#cfe3e0;
  display:flex;flex-direction:column;
  position:sticky;top:0;height:100vh;
  z-index:40;
}
.brand{
  display:flex;align-items:center;gap:12px;
  padding:22px 20px 18px;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.brand-mark{
  width:42px;height:42px;border-radius:12px;flex-shrink:0;
  background:linear-gradient(135deg,var(--teal-400),var(--cyan-500));
  color:#04231f;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:15px;letter-spacing:.5px;
  box-shadow:0 4px 14px rgba(45,212,191,.35);
}
.brand-title{font-size:15px;font-weight:700;color:#fff;line-height:1.3}
.brand-sub{font-size:9.5px;letter-spacing:1.6px;color:#7fb5af;margin-top:2px}

.nav{flex:1;padding:14px 12px;display:flex;flex-direction:column;gap:4px;overflow-y:auto}
.nav-group{display:flex;flex-direction:column;gap:2px}
.nav-group-title{
  font-size:10px;font-weight:700;letter-spacing:2px;color:rgba(127,181,175,.65);
  padding:8px 12px 4px;text-transform:uppercase;
}
.nav-item{
  display:flex;align-items:center;gap:12px;
  padding:11px 14px;border-radius:var(--radius-sm);
  color:#b9d2cf;font-size:14px;font-weight:500;
  transition:all .18s ease;
  position:relative;
}
.nav-item .nav-ic{font-size:17px;width:22px;text-align:center}
.nav-item .nav-label{flex:1}
.nav-item .nav-arrow{opacity:0;color:#6fae a8;transition:all .18s}
.nav-item:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-item.active{
  background:linear-gradient(90deg,rgba(45,212,191,.22),rgba(45,212,191,.06));
  color:#fff;
  box-shadow:inset 0 0 0 1px rgba(45,212,191,.25);
}
.nav-item.active::before{
  content:"";position:absolute;left:-12px;top:50%;transform:translateY(-50%);
  width:4px;height:22px;border-radius:0 4px 4px 0;background:var(--teal-400);
}
.nav-item.active .nav-arrow{opacity:1;color:var(--teal-400)}

.side-foot{padding:14px 16px;border-top:1px solid rgba(255,255,255,.08)}
.author-card{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.author-prefix{
  font-size:11.5px;font-weight:600;color:#0f172a;
  background:var(--teal-400);border-radius:6px;padding:2px 9px;
}
.author-name{font-size:14px;font-weight:700;color:#fff}
.side-note{font-size:11px;color:#6fa39d;line-height:1.5}

/* ===== 主区域 ===== */
.main{flex:1;min-width:0;display:flex;flex-direction:column;min-height:100vh}
.topbar{
  height:64px;flex-shrink:0;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  display:flex;align-items:center;gap:16px;
  padding:0 26px;position:sticky;top:0;z-index:30;
}
.menu-btn{display:none;font-size:20px;color:var(--ink-2);padding:4px 8px}
.crumb{font-size:16px;font-weight:700;color:var(--ink-1);white-space:nowrap}
.crumb .crumb-sub{font-size:12px;font-weight:400;color:var(--ink-4);margin-left:10px}
.top-actions{flex:1;display:flex;justify-content:flex-end}
.search-trigger{
  display:flex;align-items:center;gap:10px;
  background:var(--surface);border:1px solid var(--line-2);
  border-radius:10px;padding:8px 14px;min-width:320px;max-width:460px;
  color:var(--ink-4);font-size:13px;
  box-shadow:var(--shadow-sm);transition:all .18s;
}
.search-trigger:hover{border-color:var(--teal-500);box-shadow:0 0 0 3px rgba(6,182,212,.1)}
.search-trigger span{flex:1;text-align:left}
.search-trigger kbd{
  font-family:var(--mono);font-size:11px;background:var(--bg-soft);
  border:1px solid var(--line-2);border-radius:5px;padding:2px 7px;color:var(--ink-3);
}

.view{flex:1;padding:26px 30px 60px;max-width:1500px;width:100%;margin:0 auto}

/* ===== 响应式 ===== */
@media (max-width:900px){
  .sidebar{
    position:fixed;left:0;top:0;transform:translateX(-100%);
    transition:transform .25s ease;box-shadow:var(--shadow-lg);
  }
  .sidebar.open{transform:translateX(0)}
  .menu-btn{display:block}
  .search-trigger{min-width:0;max-width:none}
  .search-trigger span{display:none}
  .view{padding:18px 14px 50px}
}