:root{--bg:#0e0e0e;--sidebar:#151515;--panel:#181818;--panel-2:#1c1c1c;--line:#292929;--text:#f2f2f2;--muted:#9c9c9c;--subtle:#727272;--accent:#a6f36b;--accent-dark:#1d3a24;--blue:#8cb8ff;--amber:#f3c56a;--red:#ff8585;--radius:16px;--shadow:0 14px 45px #05081124}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:"DM Sans",sans-serif;font-size:14px;line-height:1.5}button,input,select,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}.sidebar{width:248px;position:fixed;inset:0 auto 0 0;background:var(--sidebar);border-right:1px solid #242424;display:flex;flex-direction:column;padding:27px 16px 15px;z-index:20}.brand{display:flex;align-items:center;gap:10px;margin:0 12px 45px;color:var(--text);text-decoration:none;font:700 20px "Space Grotesk",sans-serif;letter-spacing:-.7px}.brand-mark{display:grid;place-items:center;width:35px;height:35px;border-radius:11px;background:var(--accent);color:#172116;font:700 14px "Space 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p{font-size:11px;color:#b2b2b2;max-width:320px;margin:0 0 19px}.hero-button{background:#e8f6dd;color:#1c2a1b;padding:10px 13px;font-size:10px}.hero-button span{font-size:16px}.hero-visual{position:absolute;inset:0 0 0 45%;overflow:hidden}.orbit{position:absolute;border:1px solid #a6f36b24;border-radius:50%;width:350px;height:350px;right:60px;top:-45px}.orbit-two{width:450px;height:450px;right:10px;top:-95px;border-color:#a6f36b12}.code-window{position:absolute;right:17%;top:44px;width:300px;background:#131313d9;border:1px solid #565656;border-radius:12px;box-shadow:0 20px 60px #0b0b0ba3;transform:rotate(2deg)}.window-top{height:34px;border-bottom:1px solid #2c2c2c;display:flex;align-items:center;gap:5px;padding:0 12px}.window-top>span{width:6px;height:6px;border-radius:50%;background:#686868}.window-top>span:first-child{background:#ff7777}.window-top>span:nth-child(2){background:#f2c36b}.window-top>span:nth-child(3){background:#8ee17b}.window-top 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@media(max-width:1200px){.main-content{padding:0 25px}.hero-panel{padding-left:27px}.hero-visual{left:47%}.code-window{right:8%}.stats-grid{gap:9px}.stat-card{padding:15px}.dashboard-grid{grid-template-columns:1fr}.completion-content{padding:22px 10px}.topic-preview{grid-template-columns:1fr 1fr;column-gap:25px}.topic-row{grid-template-columns:minmax(75px,1fr) 1.4fr 28px}}
@media(max-width:850px){.sidebar{transform:translateX(-100%);transition:transform .25s;box-shadow:15px 0 45px #0004}.sidebar.open{transform:translateX(0)}.main-content{margin-left:0;padding:0 22px}.mobile-menu{display:block;margin-right:9px}.topbar{justify-content:flex-start}.breadcrumbs{flex:1}.topbar-right{gap:10px}.date-label{display:none}.hero-visual{opacity:.55;left:48%}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.topic-grid{grid-template-columns:1fr 1fr}.filter-bar{flex-wrap:wrap}.search-box{flex-basis:100%}.filter-bar select{flex:1;max-width:none}.topic-overview-stats{grid-template-columns:repeat(3,1fr)}}
@media(max-width:560px){.main-content{padding:0 14px}.topbar{height:62px;margin-bottom:23px}.topbar-right{display:none}.page-heading{align-items:flex-start;flex-direction:column;gap:15px}.page-heading h1{font-size:29px}.page-heading>.primary-button,.page-heading>.secondary-button{align-self:flex-start}.hero-panel{padding:24px 21px;min-height:280px}.hero-copy{max-width:100%}.hero-copy h2{font-size:27px}.hero-copy p{max-width:260px}.hero-visual{left:30%;opacity:.23}.code-window{right:-90px;top:70px}.floating-chip{display:none}.stats-grid{gap:9px}.stat-card{min-height:113px;padding:13px}.stat-value{font-size:25px}.stat-top{font-size:9px}.dashboard-grid{gap:11px}.content-card{padding:17px 15px}.completion-content{gap:20px;padding:22px 0}.progress-ring{width:105px;height:105px}.progress-ring strong{font-size:22px}.completion-legend{gap:10px}.topic-preview{grid-template-columns:1fr;gap:14px}.recent-item{grid-template-columns:27px minmax(0,1fr) 80px;gap:8px}.recent-item .difficulty{display:none}.app-footer{flex-direction:column;gap:8px}.topic-overview-stats{gap:7px}.topic-overview-stat{padding:12px 10px}.topic-overview-stat span{font-size:9px}.topic-overview-stat strong{font-size:20px}.topic-grid{grid-template-columns:1fr}.filter-bar select{min-width:calc(50% - 5px)}.table-footer{flex-direction:column}.compact-heading{gap:12px}.revision-tip{padding:13px}.completion-note{line-height:1.5}}

a.problem-title,a.recent-title{display:block;color:#e6e6e6;text-decoration:none}a.problem-title:hover,a.recent-title:hover{color:var(--accent);text-decoration:underline}
.sidebar{overflow-y:auto}.sync-card{margin:0 2px 14px;padding:13px 12px 12px;background:#161a16;border:1px solid #26332a;border-radius:12px}.sync-top{display:flex;align-items:flex-start;gap:10px}.sync-icon{color:var(--accent);font-size:17px;line-height:1.2}.sync-copy{min-width:0;flex:1}.sync-copy strong{font-size:11px}.sync-copy p{margin:3px 0 0;font-size:10px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sync-edit{padding:2px 6px;font-size:12px}.sync-button{width:100%;margin-top:11px;border:1px solid #3e6445;background:#1f2d22;color:var(--accent);border-radius:8px;padding:7px 10px;font-size:11px;font-weight:700;transition:.15s}.sync-button:hover{background:#263a2a}.sync-button:disabled{opacity:.6;cursor:progress}.text-input{width:100%;background:#0e0e0e;border:1px solid #333;border-radius:9px;padding:11px 12px;color:var(--text);outline:none;font-size:13px}.text-input:focus{border-color:#8cb76b}.dialog-copy{margin:0;font-size:13px;color:#c4c4c4}.dialog-copy strong{color:var(--text)}.dialog-hint{margin:12px 0 0;font-size:11px;color:var(--muted)}.dialog-hint strong{color:#c4c4c4}.disconnect-button{margin-right:auto;color:var(--red)}.practice-dialog .dialog-footer{flex-wrap:wrap}