body{background:#f8fafc}
:root{--ink:#0f172a;--ink2:#475569;--ink3:#64748b;--line:#e2e8f0;--navy:#1e3a5f;--blue:#2563eb;--blue-soft:#eff6ff;--blue-line:#dbeafe}
.serif{font-family:'Noto Serif SC','Source Han Serif SC','Songti SC','STSong','SimSun',serif}
.site-header-v7{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.header-v7-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;height:60px;gap:24px}
.header-v7-logo{display:flex;align-items:center;gap:8px;font-size:1.12rem;font-weight:700;color:var(--navy);text-decoration:none;white-space:nowrap;font-family:'Noto Serif SC','Source Han Serif SC','Songti SC','STSong','SimSun',serif;letter-spacing:.01em}
.header-v7-logo:hover{color:var(--blue)}
.header-v7-nav{display:flex;gap:2px;flex:1;flex-wrap:nowrap;overflow:visible}
.header-v7-nav>a,.nav-drop-trigger{padding:8px 11px;font-size:.84rem;color:var(--ink2);text-decoration:none;border-radius:6px;transition:all .15s;white-space:nowrap}
.header-v7-nav>a:hover,.nav-drop-trigger:hover{color:var(--blue);background:var(--blue-soft)}
.nav-drop{position:relative;padding-bottom:8px}
.nav-drop-trigger{cursor:pointer;display:flex;align-items:center;gap:3px}
.nav-arrow{font-size:.6rem;transition:transform .25s;opacity:.5}
.nav-drop:hover .nav-arrow{transform:rotate(180deg);opacity:1}
.nav-drop-panel{position:absolute;top:100%;left:50%;transform:translateX(-50%);min-width:160px;padding:8px 0;background:#fff;border:1px solid var(--line);border-radius:8px;opacity:0;visibility:hidden;transition:all .22s cubic-bezier(.4,0,.2,1);box-shadow:0 12px 32px rgba(15,23,42,.12);z-index:200}
.nav-drop:hover .nav-drop-panel{opacity:1;visibility:visible}
.nav-drop-panel a{display:block;padding:9px 18px;font-size:.84rem;color:var(--ink2);white-space:nowrap;transition:all .15s;text-decoration:none}
.nav-drop-panel a:hover{background:var(--blue-soft);color:var(--blue)}
.header-v7-login-btn,.header-v7-user a{padding:7px 16px;font-size:.85rem;border-radius:6px;color:var(--navy);border:1px solid var(--line);text-decoration:none;white-space:nowrap;transition:all .15s}
.header-v7-login-btn:hover,.header-v7-user a:hover{color:var(--blue);border-color:var(--blue)}
.header-v7-hamburger{display:none;background:none;border:none;color:var(--ink2);font-size:1.4rem;cursor:pointer}
.site-header-v7.scrolled{background:#fff;box-shadow:0 2px 20px rgba(15,23,42,.08)}
header a,nav a{color:var(--ink2);text-decoration:none}
@media(max-width:768px){.header-v7-nav{display:none;position:absolute;top:60px;left:0;right:0;flex-direction:column;background:#fff;padding:12px;border-bottom:1px solid var(--line)}.header-v7-hamburger{display:block}.nav-open .header-v7-nav{display:flex}.nav-drop-panel{position:static;transform:none;opacity:1;visibility:visible;background:transparent;border:none;box-shadow:none;padding:0 0 0 16px;min-width:0}}

/* ─── Footer（学术深蓝底，对齐新首页） ─── */
.footer-v7{background:var(--navy);border-top:0;padding:48px 24px 28px;position:relative;z-index:10}
.footer-v7-inner{max-width:1100px;margin:0 auto;display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 1fr 1fr;gap:28px}
.footer-v7-col h4{font-size:.92rem;color:#fff;margin:0 0 14px;padding-bottom:10px;border-bottom:1px solid rgba(255,255,255,.16)}
.footer-v7-col p{color:rgba(255,255,255,.7);font-size:.85rem;line-height:1.6;margin:0}
.footer-v7-col a{display:block;font-size:.83rem;color:rgba(255,255,255,.72);padding:5px 0;transition:all .15s;text-decoration:none}
.footer-v7-col a:hover{color:#fff;padding-left:4px}
.footer-v7-bottom{max-width:1100px;margin:28px auto 0;padding-top:18px;border-top:1px solid rgba(255,255,255,.16);text-align:center;font-size:.78rem;color:rgba(255,255,255,.55)}
.footer-v7-bottom p{margin:0}
.footer-v7-bottom a{color:rgba(255,255,255,.55)}
.footer-v7-bottom a:hover{color:#fff}
.footer-beian{margin-top:6px;display:flex;flex-wrap:wrap;gap:4px 16px;justify-content:center;align-items:center}
.footer-beian a{color:rgba(255,255,255,.6);text-decoration:none;font-size:.8rem;transition:color .2s}
.footer-beian a:hover{color:#fff}
.footer-gongan a{color:rgba(255,255,255,.6);font-size:.8rem}
.footer-gongan a:hover{color:#fff}
@media(max-width:768px){.footer-v7-inner{grid-template-columns:1fr 1fr;gap:24px}}
@media(max-width:480px){.footer-v7-inner{grid-template-columns:1fr}}

/* ─── 我的记录侧边栏（学术白版） ─── */
#mtFab{position:fixed;right:16px;top:50%;transform:translateY(-50%);z-index:9000;display:flex;align-items:center;gap:8px;background:var(--navy);color:#fff;border:none;border-radius:50px;padding:13px 22px;font-size:.9rem;font-weight:600;cursor:pointer;box-shadow:0 6px 24px rgba(30,58,95,.28);transition:all .2s;font-family:inherit}
#mtFab:hover{transform:translateY(calc(-50% - 2px));box-shadow:0 10px 32px rgba(30,58,95,.36)}
#mtFab span{font-size:.82rem}
#mtSidebar{position:fixed;top:0;right:0;bottom:0;width:380px;max-width:92vw;background:#fff;border-left:1px solid var(--line);z-index:9100;transform:translateX(105%);transition:transform .3s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column;box-shadow:-12px 0 40px rgba(15,23,42,.15)}
#mtSidebar.open{transform:translateX(0)}
#mtOverlay{position:fixed;inset:0;background:rgba(15,23,42,.4);z-index:9050;opacity:0;visibility:hidden;transition:all .25s}
#mtOverlay.on{opacity:1;visibility:visible}
.mt-head{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;border-bottom:1px solid var(--line)}
.mt-title{font-size:1.05rem;font-weight:700;color:var(--ink)}
.mt-close{background:none;border:none;color:var(--ink3);font-size:1.1rem;cursor:pointer;padding:4px 8px}
.mt-close:hover{color:var(--ink)}
.mt-stats{display:flex;padding:14px 20px;gap:0;border-bottom:1px solid var(--line)}
.mt-stat{flex:1;text-align:center}
.mt-stat b{display:block;font-size:1.25rem;font-weight:700;color:var(--blue);font-family:monospace}
.mt-stat span{font-size:.7rem;color:var(--ink3)}
.mt-tabs{display:flex;gap:8px;padding:12px 20px;border-bottom:1px solid var(--line)}
.mt-tab{padding:6px 18px;font-size:.8rem;cursor:pointer;border:1px solid var(--line);background:#f8fafc;color:var(--ink3);border-radius:20px;font-family:inherit;transition:all .15s}
.mt-tab.on{background:var(--blue-soft);border-color:var(--blue-line);color:var(--blue);font-weight:600}
.mt-list{flex:1;overflow-y:auto;padding:12px 16px}
.mt-item{display:flex;align-items:center;gap:12px;padding:12px 8px;border-bottom:1px solid #eef2f7}
.mt-ic{font-size:1.35rem;flex-shrink:0}
.mt-mid{flex:1;min-width:0}
.mt-nm{font-size:.86rem;font-weight:600;color:var(--ink);display:flex;align-items:center;gap:7px;flex-wrap:wrap}
.mt-cost{font-size:.68rem;color:#b45309;background:#fef3c7;border:1px solid #fde68a;padding:1px 8px;border-radius:20px}
.mt-free{font-size:.68rem;color:var(--ink3);background:#f1f5f9;border:1px solid #e2e8f0;padding:1px 8px;border-radius:20px}
.mt-q{font-size:.74rem;color:var(--ink3);margin-top:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mt-tm{font-size:.68rem;color:var(--ink3);margin-top:3px}
.mt-star{font-size:1.1rem;background:none;border:none;cursor:pointer;color:#cbd5e1;flex-shrink:0;padding:4px}
.mt-star.on{color:#f59e0b}
.mt-star:hover{transform:scale(1.15)}
.mt-pager{display:flex;justify-content:center;align-items:center;gap:10px;padding:12px 16px;border-top:1px solid var(--line)}
.mt-pager button{background:#f8fafc;border:1px solid var(--line);color:var(--ink2);padding:5px 14px;border-radius:6px;cursor:pointer;font-size:.8rem;font-family:inherit}
.mt-pager button:disabled{opacity:.35;cursor:default}
.mt-pager .mt-cur{font-size:.78rem;color:var(--ink3)}
.mt-empty{text-align:center;color:var(--ink3);padding:44px 0;font-size:.84rem}
.mt-loading{text-align:center;color:var(--ink3);padding:40px 0;font-size:.82rem}
.mt-loading i{display:inline-block;width:20px;height:20px;border:2px solid var(--blue-line);border-top-color:var(--blue);border-radius:50%;animation:mtSpin .7s linear infinite;vertical-align:middle;margin-right:8px}
@keyframes mtSpin{to{transform:rotate(360deg)}}