/* ============ CPA 智题斋 · 设计基座 ============
   设计语言：墨蓝金辉 —— 深墨蓝（专业稳重）× 鎏金（注会印章金）× 云白
   ================================================ */
:root{
  --ink:#0F2540;          /* 主色·墨蓝 */
  --ink-2:#1B3A5F;
  --ink-3:#2E5077;
  --gold:#C9A24B;         /* 强调·鎏金 */
  --gold-soft:#F3E9D2;
  --bg:#F5F7FA;           /* 页面底 */
  --card:#FFFFFF;
  --line:#E6EAF0;
  --text:#1A2433;
  --text-2:#5B6B7F;
  --text-3:#93A1B2;
  --green:#15803D; --green-bg:#EAF6EF;
  --red:#DC2626;   --red-bg:#FDECEC;
  --orange:#D97706;--orange-bg:#FDF3E3;
  --blue:#2563EB;  --blue-bg:#EAF0FD;
  --purple:#7C3AED;--purple-bg:#F1EBFD;
  --teal:#0D9488;  --teal-bg:#E6F5F3;
  --radius:16px; --radius-s:10px;
  --shadow:0 1px 3px rgba(15,37,64,.06),0 8px 24px rgba(15,37,64,.07);
  --shadow-lg:0 12px 40px rgba(15,37,64,.14);
  --sidebar-w:236px;
  --ease:cubic-bezier(.22,1,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{font-size:16px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Segoe UI","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;
  overscroll-behavior-y:none;
}
button{font-family:inherit;border:none;background:none;cursor:pointer;color:inherit}
::selection{background:var(--gold-soft)}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#CBD5E1;border-radius:8px}
::-webkit-scrollbar-track{background:transparent}

/* ---------- 布局骨架 ---------- */
#app{min-height:100vh}
.sidebar{
  position:fixed;left:0;top:0;bottom:0;width:var(--sidebar-w);
  background:linear-gradient(175deg,var(--ink) 0%,#0B1D33 100%);
  color:#fff;display:flex;flex-direction:column;z-index:50;
  padding:22px 14px 16px;
}
.brand{display:flex;align-items:center;gap:12px;padding:0 8px 22px}
.brand-logo{
  width:42px;height:42px;border-radius:12px;flex:none;
  background:linear-gradient(135deg,var(--gold),#E8C97A);
  color:var(--ink);font-weight:800;font-size:1.3rem;
  display:flex;align-items:center;justify-content:center;
  font-family:Georgia,"STSong",serif;
  box-shadow:0 4px 12px rgba(201,162,75,.35);
}
.brand-name{font-weight:700;font-size:1.02rem;letter-spacing:.5px}
.brand-sub{font-size:.68rem;color:rgba(255,255,255,.45);letter-spacing:1px}
.nav{display:flex;flex-direction:column;gap:4px;flex:1}
.nav-item{
  display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:12px;
  color:rgba(255,255,255,.62);font-size:.92rem;text-align:left;position:relative;
  transition:all .25s var(--ease);
}
.nav-item:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-item.active{background:rgba(201,162,75,.16);color:#F0DCAE;font-weight:600}
.nav-item.active::before{
  content:"";position:absolute;left:-14px;top:20%;height:60%;width:3px;
  background:var(--gold);border-radius:0 3px 3px 0;
}
.nav-ico{width:20px;text-align:center;font-size:1rem}
.nav-badge{
  margin-left:auto;background:var(--red);color:#fff;font-size:.66rem;
  min-width:18px;height:18px;border-radius:9px;display:none;
  align-items:center;justify-content:center;padding:0 5px;font-weight:600;
}
.nav-badge.show{display:flex}
.sidebar-foot{padding:12px 8px 0;border-top:1px solid rgba(255,255,255,.08)}
.exam-countdown{font-size:.76rem;color:rgba(255,255,255,.5);line-height:1.5}
.exam-countdown b{color:var(--gold);font-size:1.05rem}

.main{margin-left:var(--sidebar-w);min-height:100vh;display:flex;flex-direction:column}
.topbar{
  height:60px;display:flex;align-items:center;justify-content:space-between;
  padding:0 28px;position:sticky;top:0;z-index:30;
  background:rgba(245,247,250,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.topbar-title{font-size:1.15rem;font-weight:700;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.topbar-right{display:flex;align-items:center;gap:12px;flex-wrap:nowrap;flex-shrink:0;margin-left:auto;min-width:0}
.streak-chip{flex-shrink:0;
  background:var(--card);border:1px solid var(--line);border-radius:20px;
  padding:5px 14px;font-size:.8rem;font-weight:600;color:var(--orange);
  box-shadow:var(--shadow);
}
.view-container{flex:1;padding:8px 28px 40px;max-width:1180px;width:100%;margin:0 auto}

/* ---------- 手机底部导航 ---------- */
.tabbar{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:60;
  background:rgba(255,255,255,.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-top:1px solid var(--line);
  padding:6px 4px calc(6px + env(safe-area-inset-bottom));
}
.tab-item{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  font-size:.64rem;color:var(--text-3);padding:4px 0;transition:color .2s;
}
.tab-item .tab-ico{font-size:1.15rem;line-height:1}
.tab-item.active{color:var(--ink);font-weight:600}
.tab-item.active .tab-ico{color:var(--gold)}

/* ---------- 视图切换动画 ---------- */
.view-container>.view{animation:viewIn .38s var(--ease)}
@keyframes viewIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:#fff;padding:10px 22px;border-radius:24px;
  font-size:.85rem;opacity:0;pointer-events:none;z-index:200;
  transition:all .3s var(--ease);box-shadow:var(--shadow-lg);max-width:86vw;text-align:center;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ============ 响应式：iPad（竖屏）与中屏 ============ */
@media (max-width:1024px){
  :root{--sidebar-w:200px}
  .view-container{padding:8px 20px 40px}
}
/* ============ 响应式：手机端 ============ */
@media (max-width:768px){
  .sidebar{display:none}
  .main{margin-left:0}
  .tabbar{display:flex}
  .topbar{padding:0 16px;height:54px}
  .topbar-title{font-size:1.05rem}
  .view-container{padding:4px 14px calc(76px + env(safe-area-inset-bottom))}
  html{font-size:15px}
}