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(width<=640px){.ex-btn,.ex-a{margin-left:0}.keynotes{padding:14px}}.slide-section{border-left:4px solid var(--g-500);padding-left:20px}.sec-head{flex-wrap:wrap;align-items:baseline;gap:12px;display:flex}.sec-no{color:var(--g-500);letter-spacing:-.02em;font-size:30px;font-weight:800;line-height:1}.sec-covers{flex-direction:column;gap:9px;margin:18px 0 0;padding:0;list-style:none;display:flex}.sec-covers li{align-items:flex-start;gap:10px;display:flex}.sec-covers span{color:var(--ink-2);font-size:14.5px;line-height:1.55}.slide-body+.slide-body{margin-top:12px}@media (width<=640px){.slide-section{padding-left:14px}.sec-no{font-size:24px}}.countdown{background:var(--grad);color:#fff;border-radius:var(--r-lg);box-shadow:var(--sh-2);flex-wrap:wrap;align-items:center;gap:20px;margin:18px 0 6px;padding:20px 24px;display:flex}.countdown-n{letter-spacing:-.03em;font-size:52px;font-weight:800;line-height:1}.countdown-x{flex-direction:column;align-items:flex-start;gap:4px;display:flex}.countdown-x strong{font-size:16px;font-weight:700}.countdown-x span{opacity:.82;font-size:12.5px;line-height:1.5}.countdown-x .btn-ghost{color:#fff;background:#ffffff14;border-color:#ffffff6b;margin-top:8px}.two-up{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:16px;display:grid}.big-stat{flex-direction:column;gap:10px;display:flex}.big-stat .num{letter-spacing:-.02em;color:var(--g-700);font-size:34px;font-weight:800}.ready{border:1px solid var(--line);border-radius:var(--r-sm);background:var(--card);padding:12px 14px}.ready-hd{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:6px 10px;display:flex}.ready-name{min-width:0;font-size:14.5px;font-weight:700}.ready-meta{color:var(--ink-2);justify-content:space-between;gap:10px;margin:6px 0 8px;font-size:12.5px;display:flex}.ready-none{opacity:.72;border-style:dashed}.state{letter-spacing:.04em;text-transform:uppercase;white-space:nowrap;border-radius:999px;padding:4px 10px;font-size:11px;font-weight:800}.state-none{background:var(--sunk);color:var(--ink-3)}.state-untouched{background:var(--sunk);color:var(--ink-2)}.state-weak{background:var(--accent-wash);color:var(--accent-deep)}.state-fair{color:#8a5b00;background:#fff4d6}.state-strong{color:var(--g-700);background:#dff5ec}.fine-warn{border-left:3px solid var(--accent);background:var(--accent-wash);border-radius:0 var(--r-xs)var(--r-xs)0;color:var(--accent-deep);padding:8px 12px}.usecase-link{color:inherit;text-decoration:none;transition:border-color .18s,transform .18s}.usecase-link:hover{border-left-color:var(--accent);transform:translate(2px)}.usecase-link span{align-items:center;gap:6px;display:flex}.opt{text-align:left;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--card);cursor:pointer;width:100%;min-height:52px;padding:13px 16px;font-size:15px;line-height:1.45;transition:border-color .16s,background .16s}.opt:hover:not(:disabled){border-color:var(--g-500)}.opt-right{border-color:var(--g-500);background:#eafaf3;font-weight:700}.opt-wrong{border-color:var(--accent);background:var(--accent-wash)}.opt-dim{opacity:.5}.marked{border-radius:var(--r-sm);margin-top:16px;padding:14px 16px}.marked-ok{border:1px solid var(--g-500);background:#eafaf3}.marked-no{background:var(--accent-wash);border:1px solid var(--accent)}.marked strong{margin-bottom:5px;font-size:14px;display:block}.marked p{margin:0;font-size:14px;line-height:1.6}.lang{background:var(--sunk);border-radius:999px;gap:4px;margin-bottom:12px;padding:3px;display:inline-flex}.lang-btn{color:var(--ink-2);cursor:pointer;background:0 0;border:0;border-radius:999px;padding:5px 14px;font-size:12.5px;font-weight:700}.lang-on{background:var(--card);color:var(--g-700);box-shadow:var(--sh-1)}.board{flex-direction:column;gap:6px;display:flex}.brow{border-radius:var(--r-sm);background:var(--card);border:1px solid var(--line-2);grid-template-columns:28px minmax(0,1fr) auto auto;align-items:center;gap:12px;padding:10px 12px;display:grid}.brow-you{border-color:var(--g-500);box-shadow:var(--sh-1);background:#f2fbf7}.brow-n{color:var(--ink-3);font-size:13px;font-weight:800}.brow-name{align-items:center;gap:8px;min-width:0;font-size:14.5px;font-weight:600;display:flex}.tag-you{letter-spacing:.06em;text-transform:uppercase;background:var(--g-500);color:#fff;border-radius:999px;flex:none;padding:2px 7px;font-size:10px;font-weight:800}.brow-stats{color:var(--ink-2);gap:12px;font-size:12.5px;display:flex}.brow-pts{color:var(--g-700);text-align:right;min-width:44px;font-size:15px;font-weight:800}@media (width<=640px){.two-up{grid-template-columns:minmax(0,1fr)}.countdown{gap:14px;padding:16px 18px}.countdown-n{font-size:40px}.brow{grid-template-columns:24px minmax(0,1fr) auto}.brow-stats{display:none}}@media (width<=479px){.topnav-in{gap:10px;min-height:58px;padding:0 8px 0 14px}.brand b{font-size:19px}.navcta{gap:6px}.navcta .btn-sm{padding-inline:14px;font-size:13px}.hero-actions .btn{flex:100%}.tabs{gap:6px}.tab{padding:0 14px;font-size:13px}.panel-hd{padding:14px 16px}.panel-bd{padding:16px}.panel-ft{padding:14px 16px}.price{padding:24px 20px}.faq-q{padding:16px;font-size:15px}.faq-a{padding:0 16px 18px}.pill{border-radius:var(--r-sm);align-items:flex-start;line-height:1.5}.pill svg{margin-top:2px}.choice{gap:12px;padding:16px}.plan{padding:16px}.strip{gap:11px;padding:12px 14px}.kid{gap:12px;padding:16px}.kid-face{width:42px;height:42px;font-size:16px}.note-row{gap:12px;padding:16px}.answer{padding:12px 18px;font-size:17px}.answer-lg{font-size:19px}.field{gap:10px;padding:13px 14px}.field input,.field-cc{font-size:clamp(18px,5.6vw,24px)}.otp-row{gap:6px}.otp-box{height:56px;font-size:22px}.stage{border-radius:var(--r);min-height:340px;padding:22px 18px}.deck-bar,.quiz-bar{gap:3px}.slide{gap:16px}.slide-h1{font-size:clamp(26px,8.4vw,32px)}.slide-h2{font-size:clamp(21px,6.6vw,24px)}.formula{border-radius:var(--r-sm);max-width:100%;padding:12px 16px}.match{gap:8px}.match-item{padding:10px;font-size:13.5px}.seq-slot{gap:10px;padding:10px 12px}.pool{gap:8px}.pool-item{padding:8px 14px}.entry{min-height:68px;padding:0 16px}.entry-val{font-size:30px}.deck-nav{gap:10px}.deck-nav .btn{padding-inline:20px}.mission{padding:22px 18px}.resume{padding:24px 20px}.subject,.course-card{padding:18px}.hint-box,.wrongbox,.verdict,.due,.recap{padding:16px}.empty{padding:36px 20px}.codebox{padding:26px 16px}.doc-sec{gap:12px}.strand-hd{gap:10px;padding:14px 16px}.subgroup-hd{padding:14px 16px 6px}.std-code{padding:14px 16px 0}.std-body{padding:4px 16px 14px}.std-go{margin:0 16px 16px}}@media (width<=359px){:root{--pad:16px}.wrap{width:min(var(--max),100% - 28px)}.topnav-in{gap:6px;padding:0 6px 0 12px}.brand{gap:7px}.brand b{font-size:18px}.navcta .btn-sm{padding-inline:12px;font-size:12.5px}.menu-btn{width:40px;height:40px}.btn{padding-inline:22px}.klass-row{gap:8px}.klass{padding:12px 10px}.klass-name{font-size:19px}}@media (pointer:coarse){.ask input,.ta,.sel{font-size:16px}.std-go{min-height:var(--tap)}.lang-btn{min-height:38px;padding-inline:16px}.kid-remove{width:36px;height:36px}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}