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transparent);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:16px}:root[data-interface=modern] .card h2{letter-spacing:-.018em;color:var(--color-text-primary);margin-bottom:12px;font-size:clamp(1.22rem,2vw,1.5rem)}:root[data-interface=modern] .stat-card{--stat-accent:var(--color-primary);border-color:color-mix(in srgb, var(--stat-accent) 22%, var(--color-border));background:color-mix(in srgb, var(--color-surface) 90%, var(--stat-accent));box-shadow:0 4px 14px color-mix(in srgb, var(--stat-accent) 8%, transparent);position:relative;overflow:hidden}:root[data-interface=modern] .stat-card:before{content:"";background:var(--stat-accent);height:3px;position:absolute;inset:0 0 auto}:root[data-interface=modern] .stat-card:nth-child(4n+2){--stat-accent:var(--color-brand-teal)}:root[data-interface=modern] .stat-card:nth-child(4n+3){--stat-accent:var(--color-brand-coral)}:root[data-interface=modern] .stat-card:nth-child(4n+4){--stat-accent:var(--color-brand-violet)}:root[data-interface=modern] .stat-card__icon{filter:saturate(1.05)}:root[data-interface=modern] .mvp-row{padding-block:10px}:root[data-interface=modern] .mvp-stats div,:root[data-interface=modern] .mvp-homework-item,:root[data-interface=modern] .mvp-homework-recipients{border-radius:12px}:root[data-interface=modern] .mvp-form button,:root[data-interface=modern] .mvp-actions button,:root[data-interface=modern] .mvp-row button,:root[data-interface=modern] .mvp-primary-link{border:1px solid color-mix(in srgb, var(--color-primary) 76%, black);background:linear-gradient(135deg, var(--color-primary), color-mix(in srgb, var(--color-primary) 74%, var(--color-brand-violet)));min-height:42px;color:var(--color-text-on-primary);box-shadow:0 4px 10px color-mix(in srgb, var(--color-primary) 14%, transparent);transition:background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);border-radius:11px}:root[data-interface=modern] .mvp-form button:hover,:root[data-interface=modern] .mvp-actions button:hover,:root[data-interface=modern] .mvp-row button:hover,:root[data-interface=modern] .mvp-primary-link:hover{background:var(--color-primary-hover);box-shadow:0 6px 14px color-mix(in srgb, var(--color-primary) 20%, transparent)}:root[data-interface=modern] input:not([type=checkbox]):not([type=radio]):not([type=range]),:root[data-interface=modern] select,:root[data-interface=modern] textarea{border-color:var(--color-border-strong);background:color-mix(in srgb, var(--color-surface) 97%, var(--color-surface-warm));border-radius:10px}:root[data-interface=modern] table{border-spacing:0}:root[data-interface=modern] th{color:var(--color-muted);letter-spacing:.025em;font-size:.8rem}:root[data-interface=modern] .profile-page__tabs,:root[data-interface=modern] .homework-page__tabs{border:1px solid var(--color-border);background:color-mix(in srgb, var(--color-surface-warm) 88%, transparent);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-radius:13px;padding:4px}:root[data-interface=modern] .profile-page__tabs button.is-active,:root[data-interface=modern] .homework-page__tabs button.is-active{background:var(--color-primary);color:var(--color-text-on-primary);box-shadow:0 5px 13px color-mix(in srgb, var(--color-primary) 23%, transparent)}:root[data-interface=modern] .profile-page__preference-groups fieldset{background:color-mix(in srgb, var(--color-surface-warm) 74%, var(--color-surface));border-radius:13px}:root[data-interface=modern] .app-layout__lesson-reminder{background:color-mix(in srgb, var(--color-primary-soft) 88%, var(--color-surface));box-shadow:var(--shadow-md);border-radius:14px}:root[data-interface=modern] .mobile-menu__panel{border-radius:20px 0 0 20px}:root[data-interface=modern] .mobile-menu__links a{border:1px solid #0000;border-radius:12px}:root[data-interface=modern] .mobile-menu__links a.is-active{border-color:color-mix(in srgb, var(--color-primary) 16%, var(--color-border))}@keyframes modern-content-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}@media (width<=640px){:root[data-interface=modern] .app-layout__main,:root[data-interface=modern] .app-layout__main--sidebar-expanded,:root[data-interface=modern] .app-layout__main--sidebar-collapsed{padding-bottom:calc(82px + env(safe-area-inset-bottom))}:root[data-interface=modern] .topbar{padding-inline:11px}:root[data-interface=modern] .topbar__actions{gap:2px}:root[data-interface=modern] .topbar__icon-button{width:38px;height:38px}:root[data-interface=modern] .topbar__profile{min-height:40px;padding:3px}:root[data-interface=modern] .mobile-navigation{right:max(8px, env(safe-area-inset-right));bottom:max(8px, env(safe-area-inset-bottom));left:max(8px, env(safe-area-inset-left));border:1px solid var(--color-border);background:color-mix(in srgb, var(--color-surface) 91%, 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h1:after{background:linear-gradient(90deg, var(--color-primary) 0 44%, var(--color-brand-teal) 44% 76%, var(--color-accent-gold) 76%);width:82px;height:4px}:root[data-interface=modern] .topbar{border-bottom-color:color-mix(in srgb, var(--color-border) 88%, transparent);background:color-mix(in srgb, var(--color-surface) 94%, var(--color-surface-warm));box-shadow:0 8px 24px #25374e0a}:root[data-interface=modern] .sidebar{border-right-color:color-mix(in srgb, var(--color-border) 90%, transparent);background:linear-gradient(180deg, color-mix(in srgb, var(--color-surface) 98%, var(--color-surface-warm)), color-mix(in srgb, var(--color-surface) 94%, var(--color-primary-soft)));box-shadow:8px 0 28px #25374e0d}:root[data-interface=modern] .sidebar__link{transition:background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast)}:root[data-interface=modern] .sidebar__link:hover{background:color-mix(in srgb, 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