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auto;padding:24px 0 48px;display:flex}.page-shell{flex-direction:column;min-width:0;height:100%;display:flex;overflow:hidden}.page-shell__header,.page-shell__footer{flex-shrink:0}.page-shell__main{flex:1;min-width:0;min-height:0;padding-bottom:8px;overflow:auto}.page-header-bar{max-width:var(--container-3xl);padding:var(--space-5) var(--space-4) var(--space-4);margin:0 auto}.page-content-area{max-width:var(--container-3xl);padding:var(--space-5) var(--space-4) var(--space-6);gap:var(--space-5);box-sizing:border-box;flex-direction:column;width:100%;margin:0 auto;display:flex}.page-footer-bar{max-width:var(--container-3xl);padding:var(--space-3) var(--space-4);margin:0 auto}.page{width:100%}.page h1{margin:0 0 12px;font-size:clamp(2rem,2.4vw,3rem);line-height:1.05}.page h2{margin:0 0 12px;font-size:clamp(1.4rem,1.8vw,2rem)}.page h3{color:var(--muted);margin:0 0 10px}.language-toggle{gap:8px;display:flex}.language-toggle .button{padding:.6rem 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1.2rem;font-weight:700;transition:transform .2s,filter .2s,box-shadow .2s;display:inline-flex}.button-content{justify-content:center;align-items:center;gap:.55rem;min-width:0;display:inline-flex}.button-label{align-items:center;min-width:0;display:inline-flex}.button-spinner{box-sizing:border-box;border:2px solid;border-right-color:#0000;border-radius:999px;flex-shrink:0;width:1em;height:1em;animation:.7s linear infinite buttonSpinnerSpin}.button:hover,button:hover{transform:translateY(-1px)}.button:focus-visible,button:focus-visible{outline:2px solid var(--primary);outline-offset:3px}.primary-button{color:#fff;background:linear-gradient(135deg, var(--primary), var(--primary-dark));text-decoration:none;box-shadow:0 18px 35px #4f46e52e}.secondary-button{color:var(--text);background:#f8fafc;border-color:#94a3b838;text-decoration:none}.tertiary-button{color:var(--primary);background:0 0}button[disabled],.button[disabled]{opacity:.65;cursor:not-allowed;transform:none}.button-loading{cursor:wait}.button-loading .button-content{gap:.55rem}@keyframes buttonSpinnerSpin{to{transform:rotate(360deg)}}.message{padding:var(--space-4) var(--space-5);border-radius:var(--radius-2xl);margin:var(--space-4) 0;box-shadow:var(--shadow-sm);border:1px solid #0000}.message-error{color:#991b1b;background:#fee2e2e6;border-color:#ef444433}.message-success{color:#065f46;background:#ecfdf5e6;border-color:#10b98133}.stat-card{background:#fff;border:1px solid #94a3b829;border-radius:18px;padding:22px;box-shadow:0 10px 24px #0f172a0f}.stat-card strong{color:var(--muted);margin-bottom:10px;font-size:.95rem;display:block}.stat-card .value{color:var(--text);font-size:2rem}.auth-link{color:var(--primary);font-weight:600;text-decoration:none;transition:color .2s}.auth-link:hover{color:var(--primary-dark);text-decoration:underline}.auth-error{color:var(--danger);background:#dc262614;border:1px solid #dc26262e;border-radius:12px;margin:0;padding:10px 12px;font-size:.9rem;font-weight:700;line-height:1.45;animation:.4s authErrorShake}@keyframes authErrorShake{0%,to{transform:translate(0)}20%{transform:translate(-4px)}40%{transform:translate(4px)}60%{transform:translate(-2px)}80%{transform:translate(2px)}}.pill{color:var(--primary);background:#4f46e514;border:1px solid #4f46e52e;border-radius:999px;justify-content:center;align-items:center;padding:.55rem .95rem;font-size:.9rem;font-weight:600;display:inline-flex}.panel-footer{justify-content:space-between;gap:12px;margin-top:24px;display:flex}.modal-overlay{z-index:100;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#00000080;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.page-subtitle{color:var(--muted);margin-top:8px;line-height:1.75}.chart-container{width:100%;min-width:0;height:300px}.toast{z-index:9999;color:#fff;border-radius:8px;padding:12px 16px;font-weight:600;position:fixed;top:20px;right:20px;box-shadow:0 4px 12px #00000026}.toast-success{background:#16a34a}.toast-error{background:#dc2626}@media (width<=860px){.app-content{width:min(100%,100% - 24px);padding:18px 0 32px}.navbar-inner{justify-content:center}.page h1{text-align:center}.grid-2,.filter-grid,.stats-grid,.subject-grid{grid-template-columns:1fr}}.history-skeleton-card{border-radius:var(--radius-lg);border:1px solid var(--color-border);background:var(--color-surface);height:120px;margin-bottom:16px;position:relative;overflow:hidden}.history-skeleton-card:after{content:"";background:linear-gradient(90deg,#0000,#ffffff14,#0000);animation:1.5s infinite history-skeleton-shimmer;position:absolute;inset:0;transform:translate(-100%)}@keyframes history-skeleton-shimmer{to{transform:translate(100%)}}.history-skeleton-card{border-radius:var(--radius-lg);border:1px solid var(--color-border);background:var(--color-surface);height:120px;margin-bottom:16px;padding:20px;position:relative;overflow:hidden}.history-skeleton-header{justify-content:space-between;margin-bottom:24px;display:flex}.history-skeleton-date{background:#00000014;border-radius:999px;width:180px;height:14px}.history-skeleton-badge{background:#00000014;border-radius:999px;width:60px;height:24px}.history-skeleton-stats{gap:40px;display:flex}.history-skeleton-stat{background:#00000014;border-radius:8px;width:60px;height:32px}