.gs[data-astro-cid-ejuf357r]{margin-top:4px}.gs-tabs[data-astro-cid-ejuf357r]{display:flex;gap:4px;padding:4px;background:var(--sh2-surface);border:1px solid var(--sh2-line);border-radius:14px;box-shadow:var(--sh2-shadow);margin-bottom:12px}.gs-tab[data-astro-cid-ejuf357r]{flex:1 1 0;min-width:0;display:flex;align-items:center;justify-content:center;gap:6px;padding:9px 6px;border:none;border-radius:10px;background:transparent;color:var(--sh2-text-soft);font:inherit;font-size:.8rem;font-weight:800;cursor:pointer;transition:background .12s ease,color .12s ease}.gs-tab-count[data-astro-cid-ejuf357r]{font-size:.66rem;font-weight:800;padding:1px 7px;border-radius:999px;background:var(--sh2-indigo-soft);color:var(--sh2-indigo)}.gs-tab-active[data-astro-cid-ejuf357r]{background:var(--sh2-indigo-deep);color:#fff}.gs-tab-active[data-astro-cid-ejuf357r] .gs-tab-count[data-astro-cid-ejuf357r]{background:#fff3;color:#fff}@media (max-width: 640px){.gs-tab-count[data-astro-cid-ejuf357r]{display:none}}.gs-panel[data-astro-cid-ejuf357r]{--gs-accent: var(--sh2-indigo);--gs-soft: var(--sh2-indigo-soft)}.gs-panel[data-astro-cid-ejuf357r][hidden]{display:none}.gs-panel-physics[data-astro-cid-ejuf357r]{--gs-accent: var(--sh2-blue);--gs-soft: var(--sh2-blue-soft)}.gs-panel-chemistry[data-astro-cid-ejuf357r]{--gs-accent: var(--sh2-green);--gs-soft: var(--sh2-green-soft)}.gs-panel-biology[data-astro-cid-ejuf357r]{--gs-accent: var(--sh2-amber);--gs-soft: var(--sh2-amber-soft)}.gs-panel-head[data-astro-cid-ejuf357r]{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:0 2px 12px}.gs-panel-text[data-astro-cid-ejuf357r]{min-width:0;flex:1 1 200px}.gs-panel-title[data-astro-cid-ejuf357r]{font-size:.9rem;font-weight:800;color:var(--sh2-ink)}.gs-panel-blurb[data-astro-cid-ejuf357r]{font-size:.72rem;color:var(--sh2-text-soft);margin-top:2px;line-height:1.4}.gs-start[data-astro-cid-ejuf357r]{display:inline-flex;align-items:center;gap:6px;flex-shrink:0;padding:8px 14px;border-radius:999px;text-decoration:none;background:var(--sh2-indigo-deep);color:#fff;font-size:.76rem;font-weight:800}.gs-grid[data-astro-cid-ejuf357r]{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.gs-tile[data-astro-cid-ejuf357r]{display:flex;flex-direction:column;align-items:center;gap:2px;padding:12px 6px 10px;text-decoration:none;background:var(--sh2-surface);border:1px solid var(--sh2-line);border-bottom:3px solid var(--gs-accent);border-radius:14px;box-shadow:var(--sh2-shadow);transition:transform .12s ease,box-shadow .12s ease}.gs-tile[data-astro-cid-ejuf357r]:active{transform:scale(.98)}.gs-tile-num[data-astro-cid-ejuf357r]{width:34px;height:34px;border-radius:50%;margin-bottom:4px;display:flex;align-items:center;justify-content:center;background:var(--gs-soft);color:var(--gs-accent);font-size:.82rem;font-weight:800}.gs-tile-label[data-astro-cid-ejuf357r]{font-size:1rem;font-weight:800;color:var(--gs-accent)}.gs-tile-meta[data-astro-cid-ejuf357r]{font-size:.66rem;color:var(--sh2-text-soft)}@media (min-width: 641px){.gs-grid[data-astro-cid-ejuf357r]{grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.gs-tile[data-astro-cid-ejuf357r]:hover{transform:translateY(-3px);box-shadow:0 14px 28px -12px #2e257047}}@media (min-width: 1200px){.gs-grid[data-astro-cid-ejuf357r]{grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}}.page-wide{max-width:900px;margin:0 auto;padding:24px 16px}@media (max-width: 900px){.page-wide{padding:16px 16px calc(64px + var(--tabbar-h, 56px) + env(safe-area-inset-bottom,0px))}}@media (min-width: 1200px){.page-wide{max-width:900px}}body.sh2-page{background:#eeedf6}html[data-theme=dark] body.sh2-page{background:#121120}.page-wide{--sh2-bg: #EEEDF6;--sh2-surface: #FFFFFF;--sh2-surface-2: #F6F5FC;--sh2-ink: #1C1A38;--sh2-indigo: #4B3FA0;--sh2-indigo-deep: #2E2570;--sh2-indigo-soft: #EEEAFB;--sh2-amber: #E8963A;--sh2-amber-soft: #FBEDD9;--sh2-green: #26946A;--sh2-green-soft: #DFF3EA;--sh2-blue: #2F7DD6;--sh2-blue-soft: #E1EDFB;--sh2-text: #211F38;--sh2-text-soft: #726F92;--sh2-line: #E7E4F5;--sh2-gold: #D8A94E;--sh2-shadow: 0 1px 2px rgba(33,31,61,.05), 0 14px 28px -14px rgba(46,37,112,.22)}html[data-theme=dark] .page-wide{--sh2-bg: #121120;--sh2-surface: #1C1A30;--sh2-surface-2: #242138;--sh2-ink: #F3F1FC;--sh2-indigo: #A594F5;--sh2-indigo-deep: #7A6CD9;--sh2-indigo-soft: #2A2650;--sh2-amber: #F0B45E;--sh2-amber-soft: #3B2C15;--sh2-green: #5FCB9B;--sh2-green-soft: #183328;--sh2-blue: #6FA8EC;--sh2-blue-soft: #1B2A40;--sh2-text: #EFEDFB;--sh2-text-soft: #9C97BE;--sh2-line: #302C4E;--sh2-shadow: 0 1px 2px rgba(0,0,0,.3), 0 14px 28px -14px rgba(0,0,0,.55)}.page-wide h1,.page-wide h2,.page-wide .chapter-title,.page-wide .stat-pill b{font-family:Manrope,sans-serif}.lang-switch-link{display:flex;align-items:center;gap:7px;font-size:.74rem;font-weight:700;color:var(--sh2-indigo);background:var(--sh2-indigo-soft);border:1px solid var(--sh2-line);border-radius:10px;padding:7px 12px;margin:8px 0;text-decoration:none}.subject-hero{background:linear-gradient(155deg,var(--sh2-indigo-deep) 0%,#5A4CC4 55%,#7C63DE 100%);border-radius:16px;padding:12px 14px;margin-bottom:12px;box-shadow:0 14px 28px -16px #2e257080;overflow:hidden;box-sizing:border-box}.subject-hero-papers{text-align:center}.hero-title{font-weight:800;font-size:1rem;line-height:1.22;margin:0 0 8px;color:#fff}@media (min-width: 1200px){.hero-title{font-size:1.6rem}.hero-title-sub{font-size:.85rem}}.hero-title-sub{display:block;font-size:.72rem;font-weight:600;color:#ffffffb8;margin-top:3px}.hero-title-row{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:8px}.hero-title-inline{margin-bottom:0;flex:1 1 auto;min-width:0}.hero-meta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end;flex-shrink:0}.hero-stats-text{font-size:.74rem;font-weight:600;color:#ffffffc7;margin:0;white-space:nowrap}@media (max-width: 420px){.hero-title-row{flex-direction:column;align-items:flex-start;gap:6px}.hero-meta{justify-content:flex-start}}.papers-capsule{display:inline-flex;align-items:center;gap:7px;background:#ffffff24;border:1px solid rgba(255,255,255,.22);border-radius:999px;padding:7px 16px;font-size:.82rem;font-weight:700;color:#fff}.mock-pill{display:inline-flex;align-items:center;gap:5px;background:#ffffff24;border:1px solid rgba(255,255,255,.22);border-radius:999px;padding:5px 10px 5px 12px;font-size:.72rem;font-weight:700;color:#fff;text-decoration:none}.mock-pill i:first-child{font-size:.78rem}.mock-pill-chev{font-size:.7rem!important;color:#fff9}.unlock-group{margin-top:8px;text-align:center}.hero-toggle{display:inline-flex;background:#ffffff1a;border-radius:999px;padding:3px;gap:2px;margin-bottom:7px}.hero-toggle-btn{font-size:.66rem;font-weight:700;padding:4px 11px;border-radius:999px;border:none;background:transparent;color:#ffffffa6;cursor:pointer}.hero-toggle-btn-active{background:#fff;color:var(--sh2-indigo-deep)}.hero-toggle[hidden],#single-sub[hidden],.unlock-btn[hidden]{display:none}.unlock-btn{display:flex;align-items:center;justify-content:center;gap:6px;width:100%;box-sizing:border-box;font-size:.76rem;font-weight:800;text-align:center;padding:9px;border-radius:10px;text-decoration:none;background:#fff;color:var(--sh2-indigo-deep);box-shadow:0 8px 16px -8px #0000004d}@media (min-width: 641px){.unlock-btn{max-width:340px;margin:0 auto}}.unlock-btn i{font-size:.76rem}.unlock-btn-single{background:#ffffff24;color:#fff;box-shadow:none;border:1px solid rgba(255,255,255,.28)}.unlock-sub{font-size:.64rem;color:#ffffffbf;margin:5px 0 0}@media (max-width: 480px){.hero-title{font-size:1.12rem}.stat-pill{min-width:0;padding:7px 8px}.stat-pill b{font-size:.9rem}.stat-pill span{font-size:.6rem}}.grace-banner{margin-bottom:16px;padding:12px 16px;border-radius:12px;background:var(--sh2-amber-soft);border:1px solid rgba(232,150,58,.35);color:#6b4a00;font-size:.8rem;line-height:1.5}html[data-theme=dark] .grace-banner{color:var(--sh2-amber)}.section-heading{font-size:.9rem;font-weight:800;color:var(--sh2-ink);margin:22px 0 10px;padding-left:10px;border-left:3px solid var(--sh2-indigo)}.section-heading:first-of-type{margin-top:4px}.chapter-list{display:flex;flex-direction:column;gap:6px}@media (min-width: 641px) and (max-width: 1199px){.chapter-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.chapter-card{flex-direction:column;align-items:flex-start;gap:6px;padding:14px 16px 12px;position:relative;border-bottom:3px solid var(--sh2-indigo);transition:transform .15s ease,box-shadow .15s ease}.chapter-card:hover{transform:translateY(-3px);box-shadow:0 14px 28px -12px #2e257047}.chapter-num{width:28px;height:28px;font-size:.76rem;margin-bottom:2px}.chapter-chev{display:none}}@media (min-width: 1200px){.chapter-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.chapter-card{flex-direction:column;align-items:flex-start;gap:6px;padding:16px 18px 14px;position:relative;border-bottom:3px solid var(--sh2-indigo);transition:transform .15s ease,box-shadow .15s ease}.chapter-card:hover{transform:translateY(-3px);box-shadow:0 14px 28px -12px #2e257047}.chapter-num{width:30px;height:30px;font-size:.78rem;margin-bottom:2px}.chapter-title{font-size:.95rem}.chapter-meta{font-size:.76rem;margin-top:2px}.chapter-chev{display:none}}.chapter-card{display:flex;align-items:center;gap:10px;background:var(--sh2-surface);border-radius:12px;padding:9px 12px;box-shadow:var(--sh2-shadow);border:1px solid var(--sh2-line);text-decoration:none;transition:transform .12s ease}.chapter-card:active{transform:scale(.99)}.chapter-num{flex-shrink:0;width:26px;height:26px;border-radius:50%;background:var(--sh2-indigo-soft);color:var(--sh2-indigo);display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:800}.chapter-body{flex:1;min-width:0}.chapter-title{font-size:.82rem;font-weight:700;color:var(--sh2-ink);line-height:1.28}.chapter-meta{font-size:.68rem;color:var(--sh2-text-soft);margin-top:1px}.chapter-chev{flex-shrink:0;color:var(--sh2-text-soft);font-size:.82rem}.empty-state{background:var(--sh2-surface);border:1px dashed var(--sh2-line);border-radius:16px;padding:2.5rem;text-align:center;color:var(--sh2-text-soft);box-shadow:var(--sh2-shadow)}.empty-state i{font-size:28px;display:block;margin-bottom:8px}.empty-state p{margin:0}.verify-toast{position:fixed;bottom:20px;left:50%;transform:translate(-50%);max-width:90vw;width:420px;background:var(--sh2-surface);border:1px solid var(--sh2-indigo);border-radius:12px;box-shadow:0 6px 24px #211f3d2e;padding:12px 14px;display:flex;align-items:center;gap:10px;z-index:55;animation:toast-in .35s ease-out}@keyframes toast-in{0%{opacity:0;transform:translate(-50%) translateY(12px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.verify-toast i.ti-mail-exclamation{color:var(--sh2-indigo);font-size:18px;flex-shrink:0}.verify-toast-text{flex:1;font-size:13px;color:var(--sh2-ink)}.verify-toast-text a{color:var(--sh2-indigo);font-weight:600;text-decoration:underline}.verify-toast-close{background:none;border:none;color:var(--sh2-text-soft);cursor:pointer;padding:2px;display:flex;align-items:center;flex-shrink:0}@media (max-width: 480px){.verify-toast{bottom:calc(12px + var(--tabbar-h, 56px) + env(safe-area-inset-bottom,0px));width:calc(100vw - 24px)}}