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#e2e6f0;border-radius:10px;margin-bottom:9px;background:#fff;cursor:pointer;font-size:.91rem}.daily-option:has(input:checked){background:#f0f3ff;border-color:#758ad0}.daily-option input{accent-color:#4c66b5}.daily-option.success{border-color:#6ac4a1;background:#eaf8f1}.daily-option.failure{border-color:#e4a3aa;background:#fff0f2}.flash-wrap{max-width:760px;margin:auto}.flip-card{border:1px solid #dce4f3;background:linear-gradient(145deg,#fff,#f0f3ff);border-radius:19px;min-height:300px;display:grid;place-items:center;text-align:center;padding:35px;cursor:pointer;box-shadow:var(--shadow)}.flip-card p{color:#8190b4;font-size:.78rem}.flip-card h2{font-size:1.36rem;line-height:1.75;letter-spacing:0}.flash-nav{display:flex;justify-content:space-between;gap:12px;margin-top:19px}.tutor-layout{max-width:880px}.chat-box{height:460px;overflow:auto;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:17px}.bubble{padding:14px 17px;border-radius:15px;max-width:83%;font-size:.87rem;white-space:pre-wrap;line-height:1.8}.bubble.bot{background:#f0f3fb;color:#3f4f78;align-self:flex-start}.bubble.me{background:#435aa2;color:white;align-self:flex-end}.bubble-source{font-size:.67rem;color:#8c9ab0;margin-top:5px}.chat-input{display:flex;gap:10px;margin-top:13px}.chat-input input{flex:1;min-width:0}.suggested-prompts{display:flex;flex-wrap:wrap;gap:8px;margin:15px 0}.prompt-chip{font-size:.73rem;color:#586da9;background:#fff;border:1px solid #dfe5f2;border-radius:20px;padding:7px 10px}.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px;max-width:980px;margin:30px auto}.price-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:27px}.price-card.highlight{border:2px solid #5d75c1;box-shadow:var(--shadow)}.price-card h3{margin-bottom:16px}.price-figure{font-weight:850;font-size:2.4rem;margin-bottom:2px}.price-figure small{font-size:.81rem;color:#8490a4}.price-features{list-style:none;padding:0;margin:23px 0}.price-features li{font-size:.82rem;margin:11px 0;color:#677793}.price-features li:before{content:'✓';color:var(--teal);font-weight:800;margin-right:9px}.notes-list{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.note-card{background:#fff;border:1px solid var(--line);border-radius:13px;padding:19px}.note-card h3{font-size:.96rem}.note-card p{font-size:.8rem}.note-card ul{color:#728099;font-size:.78rem;padding-left:20px}.table-wrap{overflow:auto}.data-table{width:100%;border-collapse:collapse;min-width:540px}.data-table th{text-align:left;background:#f7f8fc;font-size:.73rem;color:#7f8ba3;padding:12px 13px}.data-table td{padding:13px;border-bottom:1px solid var(--line);font-size:.82rem}.data-table tr:last-child td{border-bottom:0}.mobile-menu{display:none}.page-loading{min-height:100vh;display:grid;place-items:center;color:#8894aa;font-weight:600}.spinner{display:inline-block;width:22px;height:22px;border:3px solid #dbe3fc;border-top-color:#5369b2;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#toast-region{position:fixed;right:20px;bottom:24px;z-index:100;display:grid;gap:8px}.toast{background:#223567;color:white;border-radius:11px;padding:13px 16px;box-shadow:var(--shadow);font-size:.83rem;max-width:360px}.toast.error{background:#ae4859}.muted{color:var(--muted)}.text-sm{font-size:.8rem}.text-xs{font-size:.7rem}.text-right{text-align:right}.mt-1{margin-top:9px}.mt-2{margin-top:17px}.mt-3{margin-top:27px}.mb-2{margin-bottom:17px}.flex{display:flex;gap:10px;align-items:center}.flex-between{display:flex;justify-content:space-between;gap:12px;align-items:center}.pill{border:1px solid #dfe5f0;border-radius:30px;padding:6px 10px;font-size:.71rem;font-weight:750;color:#637298;background:white}.hide{display:none!important}.study-note{line-height:1.8}.study-note h4{margin-bottom:4px}.divider{height:1px;background:var(--line);margin:17px 0}
@media(max-width:1080px){.feature-grid,.tool-grid{grid-template-columns:repeat(3,1fr)}.mode-grid{grid-template-columns:repeat(2,1fr)}.hero-grid{grid-template-columns:1fr 1fr;gap:20px}.hero h1{font-size:3rem}.app-layout{grid-template-columns:215px minmax(0,1fr)}.sidebar{padding:18px 8px}.main-content{padding:26px 22px}.metric-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.container{width:min(100% - 30px,1170px)}.site-header{height:66px}.nav-links{display:none}.nav-actions{gap:6px}.nav-actions .btn{padding:9px 12px;font-size:.76rem;min-height:36px}.brand{font-size:1.1rem}.brand-icon{width:32px;height:32px}.hero{padding:47px 0 64px}.hero-grid{grid-template-columns:1fr}.hero h1{font-size:clamp(2.35rem,9vw,3.6rem)}.hero-showcase{margin:25px 12px 0}.floating-card{margin:-9px 0 0 -12px}.stats-grid{grid-template-columns:repeat(2,1fr);row-gap:22px}.stat:nth-child(2){border:0}.section{padding:60px 0}.feature-grid,.tool-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}.app-layout{display:block;padding-bottom:66px}.sidebar{height:auto;position:fixed;top:auto;bottom:0;left:0;right:0;display:flex;flex-direction:row;justify-content:space-around;padding:8px 3px;background:#fff;border-top:1px solid var(--line);border-right:0;overflow:visible;z-index:30}.sidebar .brand,.sidebar-label,.sidebar-end,.account-chip{display:none}.sidebar nav{display:contents}.side-link{display:flex;flex-direction:column;gap:1px;padding:5px 7px;font-size:.62rem;margin:0}.side-symbol{font-size:1.14rem}.side-link.mobile-hide{display:none}.dash-topbar{height:64px;padding:0 17px}.topbar-right{gap:7px}.main-content{padding:24px 16px 45px}.greet-banner{padding:24px;align-items:flex-start;flex-direction:column}.page-heading{align-items:flex-start;flex-direction:column}.content-grid{grid-template-columns:1fr}.mode-grid{grid-template-columns:1fr 1fr}.exam-header{padding:12px 15px}.exam-body{grid-template-columns:1fr;width:calc(100% - 24px);margin:12px auto}.exam-side{order:-1;padding:16px}.exam-side .legend,.exam-help{display:none}.q-palette{display:flex;overflow-x:auto;gap:8px;padding:9px 0 3px;border:0}.q-number{min-width:35px;min-height:35px}.question-inner{padding:22px 17px;min-height:280px}.question-inner h2{font-size:1.07rem}.exam-actions{padding:13px;gap:8px}.results-hero{grid-template-columns:1fr;text-align:center}.pricing-grid{grid-template-columns:1fr;max-width:470px}.notes-list{grid-template-columns:1fr}.chat-box{height:400px}}
@media(max-width:440px){.nav-actions .btn-outline{display:none}.feature-grid,.tool-grid,.mode-grid{grid-template-columns:1fr 1fr;gap:10px}.feature-card{padding:16px;min-height:155px}.mode-card{padding:16px}.metric-grid{gap:10px}.metric-card{padding:14px}.metric-card .number{font-size:1.55rem}.form-row{grid-template-columns:1fr}.page-heading h1{font-size:1.7rem}.footer-grid{gap:13px}.code-pill{padding:7px 5px}.code-pill select{max-width:105px}.exam-header h2{font-size:.84rem}.exam-header p{font-size:.65rem}}

/* Appearance switch: these variables and fallbacks cover the existing cards and layouts. */
.appearance-picker{position:fixed;z-index:1000;right:18px;bottom:18px;display:flex;gap:7px;align-items:center;border:1px solid var(--line);background:var(--card);color:var(--ink);box-shadow:var(--shadow);border-radius:12px;padding:8px 11px;font-size:12px;font-weight:700}
.appearance-picker select{border:0;color:inherit;background:transparent;max-width:120px;cursor:pointer;outline-offset:2px}
html[data-theme="dark"]{--ink:#edf2ff;--muted:#aebbd4;--bg:#0e1526;--card:#18243a;--line:#33415d;--violet:#667fe0;--violet2:#8298ed;--shadow:0 13px 42px rgba(0,0,0,.22)}
html[data-theme="dark"] body,html[data-theme="dark"] .app-layout{background:var(--bg)}
html[data-theme="dark"] :is(.site-header,.sidebar,.dash-topbar,.site-footer,.stats-band,.panel,.metric-card,.feature-card,.mode-card,.tool-tile,.auth-card,.question-panel,.exam-side,.exam-header,.results-hero,.price-card,.notes-card,.floating-card,.showcase,.mini-opt,.input,.select,.textarea,.btn-outline,.question-inner,.answer-row,.review-question,.chat-box,.notice,.code-pill,.account-chip,.appearance-picker){background-color:var(--card)!important;color:var(--ink)!important;border-color:var(--line)!important}
html[data-theme="dark"] :is(.main-content,.section-tint,.auth-wrap,.hero,.inline-edit){background:#111c30!important}
html[data-theme="dark"] :is(.mini-test,.eyebrow,.tag,.feature-icon,.side-link.active,.btn-soft,.empty,.top-banner,.list-row,.option,.q-number,.exam-help,.explanation,.search,.topic-row){background-color:#24314b!important;color:var(--ink)!important;border-color:var(--line)!important}
html[data-theme="dark"] :is(p,small,.muted,.desc,.sidebar-label,.form-group label,.nav-links a,.footer-grid a,.stat span,.auth-switch,.topbar-title,.side-link,.mode-meta,.line,.form-hint){color:var(--muted)!important}
html[data-theme="dark"] :is(h1,h2,h3,h4,strong,.brand,.metric-card .number,.feature-card h3,.topbar-right){color:var(--ink)}
html[data-theme="dark"] .btn-primary,html[data-theme="dark"] .btn-success{color:#fff!important;background:#4864bf!important}
html[data-theme="dark"] .greet-banner,html[data-theme="dark"] .cta-band{background:#253e78!important;color:#fff!important}
html[data-theme="dark"] .greet-banner :is(h2,p),html[data-theme="dark"] .cta-band :is(h2,p){color:#f0f4ff!important}
html[data-theme="dark"] :is(.answer-row.correct,.tag.green){background:#153c36!important;color:#9ae6c7!important}
html[data-theme="dark"] :is(.answer-row.wrong,.tag.red){background:#492633!important;color:#ffc4d0!important}
@media(max-width:640px){.appearance-picker{right:10px;bottom:10px;padding:6px}.appearance-label{display:none}}