/* ============================================================
   EigenScore — shared stylesheet
   ============================================================ */

:root{
  color-scheme:dark;
  --bg:#0d1117;
  --surface:#161b22;
  --surface-2:#1c2230;
  --surface-hover:#1a2029;
  --border:#2a3140;
  --text:#e6edf3;
  --text-dim:#9aa7b6;
  --text-muted:#6e7c8c;
  --accent:#3b82f6;
  --accent-dim:#1e3a5f;
  --code-bg:#0b0f16;

  /* difficulty */
  --easy:#3fb950;
  --med:#d29922;
  --hard:#f85149;

  /* generic status colors */
  --green:#3fb950;
  --amber:#d29922;
  --red:#f85149;

  /* leaderboard tiers */
  --t-newbie:#8b949e;
  --t-pupil:#3fb950;
  --t-apprentice:#2dd4bf;
  --t-specialist:#58a6ff;
  --t-expert:#a371f7;
  --t-master:#d29922;
  --t-grandmaster:#ff5941;
  --t-legend:#d61f2b;

  /* announcement tags */
  --tag-contest:#a371f7; --tag-contest-bg:#2a1f45;
  --tag-feature:#3fb950; --tag-feature-bg:#12331b;
  --tag-maint:#d29922;   --tag-maint-bg:#3a2c0a;
  --tag-news:#58a6ff;    --tag-news-bg:#12283f;
}

*{box-sizing:border-box;margin:0;padding:0;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
code,pre{font-family:"SF Mono",Menlo,Consolas,"Roboto Mono",monospace;}

/* ============================================================
   Top navigation (shared across all pages)
   ============================================================ */
header{
  display:flex;align-items:center;
  height:60px;padding:0 28px;
  border-bottom:1px solid var(--border);
  background:var(--surface);
  position:sticky;top:0;z-index:10;
}
.logo{font-size:22px;font-weight:700;letter-spacing:-0.02em;margin-right:36px;}
.logo .score{color:var(--accent);}
nav.main{display:flex;gap:26px;}
nav.main a{color:var(--text-dim);font-size:15px;font-weight:500;transition:color .15s;}
nav.main a:hover,nav.main a.active{color:var(--text);}
.spacer{flex:1;}
.auth{display:flex;align-items:center;gap:16px;}
.auth a{color:var(--text-dim);font-size:15px;font-weight:500;transition:color .15s;}
.auth a:hover{color:var(--text);}
.btn-register{background:var(--accent);color:#fff;padding:7px 16px;border-radius:7px;}
.btn-register:hover{background:#2f6fd6;color:#fff;}

/* signed-in nav: default avatar + sign out */
#auth-signed-in{display:none;}
.nav-avatar-link{display:inline-flex;align-items:center;}
.nav-avatar{display:inline-block;width:30px;height:30px;border-radius:50%;
  background:var(--surface-2);border:1px solid var(--border);
  background-image:radial-gradient(circle at 50% 38%, var(--text-muted) 0 26%, transparent 27%),
    radial-gradient(circle at 50% 96%, var(--text-muted) 0 42%, transparent 43%);
  background-repeat:no-repeat;}
.nav-avatar-link:hover .nav-avatar{border-color:var(--text-muted);}

/* profile page */
.profile-head{display:flex;align-items:center;gap:18px;}
.profile-avatar{width:64px;height:64px;}

/* clerk mounted component wrapper */
.auth-mount{display:flex;justify-content:center;margin-top:32px;}

/* username picker */
.uname-box{display:flex;flex-direction:column;gap:12px;}
.uname-input{background:var(--code-bg);border:1px solid var(--border);border-radius:9px;
  padding:12px 14px;font-size:16px;color:var(--text);outline:none;
  font-family:"SF Mono",Menlo,Consolas,monospace;}
.uname-input:focus{border-color:var(--accent);}
.uname-status{font-size:13px;min-height:18px;}
.uname-status.ok{color:var(--easy);}
.uname-status.bad{color:var(--hard);}
.uname-submit{border:none;cursor:pointer;}
.uname-submit:disabled{opacity:.45;cursor:default;}

/* profile page */
.profile-avatar-col{display:flex;flex-direction:column;align-items:center;gap:8px;}
.profile-avatar-img{width:64px;height:64px;border-radius:50%;object-fit:cover;
  border:1px solid var(--border);}
.avatar-update-btn{background:none;border:1px solid var(--border);border-radius:7px;
  color:var(--text-dim);font-size:12px;padding:5px 9px;cursor:pointer;transition:all .12s;}
.avatar-update-btn:hover{color:var(--text);border-color:var(--accent);}
.avatar-update-btn:disabled{opacity:.5;cursor:default;}
.av-img{object-fit:cover;}
.profile-sub{font-size:14px;display:flex;gap:6px;align-items:baseline;}
.profile-empty{color:var(--text-muted);font-size:14px;margin:10px 18px;}
.rating-graph{width:100%;height:auto;display:block;}
.graph-label{fill:var(--text-muted);font-size:11px;font-family:inherit;}
.graph-wrap{position:relative;}
.pt .dot{transition:r .1s;}
.pt:hover .dot{r:5.5;}
.graph-tip{position:absolute;transform:translateY(-100%);pointer-events:none;
  background:var(--surface-2);border:1px solid var(--border);border-radius:7px;
  padding:7px 10px;font-size:13px;white-space:nowrap;z-index:5;
  box-shadow:0 4px 14px rgba(0,0,0,.45);}
.graph-tip .tip-mu{font-weight:700;}
.graph-tip .tip-up{color:var(--easy);font-weight:600;}
.graph-tip .tip-down{color:var(--hard);font-weight:600;}
.graph-tip .tip-date{color:var(--text-dim);font-size:12px;margin-top:2px;}
.graph-tip.below{transform:none;}
.band-newbie{fill:var(--t-newbie);opacity:.07;}
.band-pupil{fill:var(--t-pupil);opacity:.08;}
.band-apprentice{fill:var(--t-apprentice);opacity:.08;}
.band-specialist{fill:var(--t-specialist);opacity:.09;}
.band-expert{fill:var(--t-expert);opacity:.10;}
.band-master{fill:var(--t-master);opacity:.10;}
.band-grandmaster{fill:var(--t-grandmaster);opacity:.11;}
.band-legend{fill:var(--t-legend);opacity:.12;}
.solved-grid{display:flex;flex-direction:column;gap:8px;margin:10px 18px;}
.solved-chip{display:flex;align-items:center;gap:10px;padding:9px 12px;
  background:var(--surface-2);border:1px solid var(--border);border-radius:8px;
  color:var(--text);text-decoration:none;font-size:14px;}
.solved-chip:hover{border-color:var(--accent);}
.solved-check{color:var(--easy);font-weight:700;}
.solved-score{color:var(--accent);font-weight:600;font-size:13px;
  font-family:"SF Mono",Menlo,Consolas,monospace;white-space:nowrap;}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--accent-dim);border:1px solid var(--border);}

/* ============================================================
   Shared layout / cards
   ============================================================ */
.wrap{max-width:1000px;margin:28px auto;padding:0 28px;}
.page-title{font-size:24px;font-weight:700;margin-bottom:18px;}

.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;}
.card-head{
  padding:14px 18px;border-bottom:1px solid var(--border);
  font-size:15px;font-weight:600;display:flex;align-items:center;justify-content:space-between;
}
.card-head .see-all{font-size:13px;color:var(--accent);font-weight:500;}
.card-body{padding:6px 0;}

/* shared pagination */
.pagination{display:flex;justify-content:center;gap:6px;margin-top:22px;}
.pagination a{
  min-width:36px;height:36px;display:flex;align-items:center;justify-content:center;
  background:var(--surface);border:1px solid var(--border);border-radius:8px;
  font-size:14px;color:var(--text-dim);padding:0 10px;
}
.pagination a:hover{color:var(--text);border-color:var(--text-muted);}
.pagination a.active{background:var(--accent);color:#fff;border-color:var(--accent);}

/* shared search box */
.search{
  flex:1;max-width:340px;display:flex;align-items:center;gap:8px;
  background:var(--surface);border:1px solid var(--border);border-radius:9px;padding:9px 14px;
}
.search input{background:none;border:none;outline:none;color:var(--text);font-size:14px;width:100%;}
.search input::placeholder{color:var(--text-muted);}
.icon-btn{
  width:38px;height:38px;display:flex;align-items:center;justify-content:center;
  background:var(--surface);border:1px solid var(--border);border-radius:9px;color:var(--text-dim);cursor:pointer;
}
.icon-btn:hover{color:var(--text);border-color:var(--text-muted);}

/* ============================================================
   Home page
   ============================================================ */
.layout{
  display:grid;grid-template-columns:1fr 320px;gap:24px;
  max-width:1200px;margin:28px auto;padding:0 28px;
}
.hero{
  background:linear-gradient(135deg,var(--surface-2),var(--surface));
  border:1px solid var(--border);border-radius:12px;
  padding:22px 24px;margin-bottom:24px;
  display:flex;align-items:center;justify-content:space-between;
}
.hero .label{font-size:13px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:6px;}
.hero .title{font-size:22px;font-weight:700;margin-bottom:4px;}
.hero .sub{font-size:14px;color:var(--text-dim);}
.hero .cd{text-align:right;}
.hero .cd .num{font-size:30px;font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums;}
.hero .cd .u{font-size:13px;color:var(--text-muted);}

.contest-row{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--border);}
.contest-row:last-child{border-bottom:none;}
.contest-info .name{font-size:15px;font-weight:600;margin-bottom:2px;}
.contest-info .meta{font-size:13px;color:var(--text-muted);}
.countdown{text-align:right;}
.countdown .time{font-size:15px;font-weight:600;color:var(--accent);font-variant-numeric:tabular-nums;}
.countdown .lbl{font-size:12px;color:var(--text-muted);}

.badge{display:inline-block;font-size:12px;font-weight:600;padding:2px 9px;border-radius:20px;margin-left:8px;}
.badge.rated{background:var(--accent-dim);color:#7cb0f0;}
.badge.live{background:rgba(63,185,80,.15);color:var(--green);}

.ann{padding:14px 18px;border-bottom:1px solid var(--border);}
.ann:last-child{border-bottom:none;}
.ann .t{font-size:14px;font-weight:600;margin-bottom:2px;}
.ann .d{font-size:13px;color:var(--text-muted);}

.lb-row{display:flex;align-items:center;gap:12px;padding:11px 18px;border-bottom:1px solid var(--border);}
a.lb-row{color:inherit;text-decoration:none;}
a.lb-row:hover{background:var(--surface-2);}
.lb-av-img{object-fit:cover;border-radius:50%;}
a.ann{display:block;color:inherit;text-decoration:none;}
a.ann:hover .t{color:var(--accent);}
.lb-row:last-child{border-bottom:none;}
.lb-rank{width:22px;font-size:14px;font-weight:700;color:var(--text-muted);text-align:center;}
.lb-av{width:28px;height:28px;border-radius:50%;background:var(--accent-dim);flex-shrink:0;}
.lb-name{flex:1;font-size:14px;font-weight:500;}
.lb-rating{font-size:14px;font-weight:600;color:var(--accent);font-variant-numeric:tabular-nums;}

/* ============================================================
   Problems list page
   ============================================================ */
.filter-group{display:flex;align-items:flex-start;gap:14px;margin-bottom:16px;}
.filter-label{flex-shrink:0;width:46px;padding-top:8px;font-size:12px;font-weight:600;
  text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);}
.topics{display:flex;flex-wrap:wrap;gap:9px;}
.topic{
  background:var(--surface);border:1px solid var(--border);color:var(--text-dim);
  font-size:13px;font-weight:500;padding:7px 15px;border-radius:20px;cursor:pointer;
  text-decoration:none;transition:all .15s;
}
.topic:hover{border-color:var(--text-muted);color:var(--text);}
.topic.active{background:var(--text);color:var(--bg);border-color:var(--text);}
/* secondary (topic) pills: smaller, lighter */
.topics.small .topic{font-size:12px;padding:4px 11px;}
/* difficulty filter pills (in the toolbar, next to search) */
.diff-filter{display:flex;gap:7px;}
.dpill{
  background:var(--surface);border:1px solid var(--border);color:var(--text-dim);
  font-size:12px;font-weight:600;padding:6px 13px;border-radius:20px;
  text-decoration:none;transition:all .15s;
}
.dpill:hover{border-color:var(--text-muted);color:var(--text);}
.dpill.active{background:var(--text);color:var(--bg);border-color:var(--text);}
.dpill.easy.active{background:var(--easy);border-color:var(--easy);color:#0d1117;}
.dpill.med.active{background:var(--med);border-color:var(--med);color:#0d1117;}
.dpill.hard.active{background:var(--hard);border-color:var(--hard);color:#0d1117;}

.toolbar{display:flex;align-items:center;gap:12px;margin-bottom:18px;}
.solved-count{margin-left:auto;font-size:14px;color:var(--text-dim);}
.solved-count b{color:var(--text);}

.plist{background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;}
.prow{display:flex;align-items:center;padding:14px 18px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .12s;}
.prow:last-child{border-bottom:none;}
.prow:nth-child(even){background:rgba(255,255,255,.015);}
.prow:hover{background:var(--surface-hover);}
.p-status{width:44px;font-size:15px;flex-shrink:0;display:flex;align-items:center;}
.p-solved,.p-best{display:inline-block;width:34px;text-align:center;}
.p-solved{color:var(--easy);font-weight:700;}
.p-best{color:var(--accent);font-weight:600;font-size:12.5px;
  font-family:"SF Mono",Menlo,Consolas,monospace;}
.p-status.solved{color:var(--easy);}
.p-title{flex:1;font-size:15px;font-weight:500;}
.p-title .pid{color:var(--text-muted);font-weight:400;margin-right:4px;}
.p-acc{width:70px;text-align:right;font-size:14px;color:var(--text-dim);font-variant-numeric:tabular-nums;}
.p-diff{width:80px;text-align:right;font-size:14px;font-weight:500;}
.p-diff.easy{color:var(--easy);}
.p-diff.med{color:var(--med);}
.p-diff.hard{color:var(--hard);}
.ptype-badge{font-size:11px;font-weight:600;padding:2px 8px;border-radius:20px;background:var(--surface-2);color:var(--text-dim);margin-left:8px;text-transform:capitalize;}
.ptopic-badge{font-size:11px;font-weight:500;padding:2px 8px;border-radius:20px;border:1px solid var(--border);color:var(--text-muted);margin-left:6px;}

/* ============================================================
   Leaderboard page
   ============================================================ */
.total{margin-left:auto;font-size:14px;color:var(--text-dim);}
.total b{color:var(--text);}

.lb{background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;}
.lb-head{
  display:flex;align-items:center;padding:12px 20px;border-bottom:1px solid var(--border);
  font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;
}
.row{display:flex;align-items:center;padding:12px 20px;border-bottom:1px solid var(--border);transition:background .12s;cursor:pointer;color:inherit;text-decoration:none;}
.row:last-child{border-bottom:none;}
.row:hover{background:var(--surface-hover);}
.c-rank{width:56px;font-size:15px;font-weight:700;color:var(--text-muted);font-variant-numeric:tabular-nums;}
.c-user{flex:1;display:flex;align-items:center;gap:12px;}
.c-user .av{width:30px;height:30px;border-radius:50%;background:var(--accent-dim);flex-shrink:0;}
.c-user .name{font-size:15px;font-weight:600;}
.c-rating{width:90px;text-align:right;font-size:15px;font-weight:600;font-variant-numeric:tabular-nums;}
.c-title{width:130px;text-align:right;font-size:14px;font-weight:500;}
.c-contests{width:90px;text-align:right;font-size:14px;color:var(--text-dim);font-variant-numeric:tabular-nums;}

.newbie{color:var(--t-newbie);} .pupil{color:var(--t-pupil);} .apprentice{color:var(--t-apprentice);}
.specialist{color:var(--t-specialist);} .expert{color:var(--t-expert);} .master{color:var(--t-master);}
.grandmaster{color:var(--t-grandmaster);} .legend{color:var(--t-legend);}
a.name{text-decoration:none;}
a.name:hover{text-decoration:underline;}

/* ============================================================
   Announcements page
   ============================================================ */
.feed{display:flex;flex-direction:column;gap:14px;}
.post{display:block;text-decoration:none;color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px 20px;cursor:pointer;transition:border-color .15s,background .15s;}
.post:hover{border-color:var(--text-muted);background:var(--surface-hover);}
.post-top{display:flex;align-items:center;gap:10px;margin-bottom:8px;}
.tag{font-size:12px;font-weight:600;padding:3px 10px;border-radius:20px;}
.tag.contest{color:var(--tag-contest);background:var(--tag-contest-bg);}
.tag.feature{color:var(--tag-feature);background:var(--tag-feature-bg);}
.tag.maint{color:var(--tag-maint);background:var(--tag-maint-bg);}
.tag.news{color:var(--tag-news);background:var(--tag-news-bg);}
.post-date{font-size:13px;color:var(--text-muted);}
.post-title{font-size:17px;font-weight:600;margin-bottom:5px;}
.post-excerpt{font-size:14px;color:var(--text-dim);line-height:1.6;}
.read-more{color:var(--accent);font-size:14px;font-weight:500;margin-top:10px;display:inline-block;}

/* ============================================================
   Contests page
   ============================================================ */
.hero .badge{vertical-align:middle;}
.hero-right{text-align:right;flex-shrink:0;}
.hero-right .cd{font-size:32px;font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums;margin-bottom:4px;}
.hero-right .cdlbl{font-size:13px;color:var(--text-muted);margin-bottom:14px;}
.btn-register-lg{display:inline-block;background:var(--accent);color:#fff;font-size:14px;font-weight:600;padding:9px 22px;border-radius:8px;}
.btn-register-lg:hover{background:#2f6fd6;}

.section-title{font-size:16px;font-weight:600;margin:26px 0 12px;color:var(--text);}

.clist{background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;}
.crow{display:flex;align-items:center;padding:15px 20px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .12s;}
a.crow{color:inherit;text-decoration:none;transition:background .12s;}
a.crow:hover{background:var(--surface-2);}
.registered-chip{color:var(--easy);font-weight:600;font-size:14px;
  border:1px solid var(--easy);border-radius:8px;padding:8px 16px;}
a.registered-chip{text-decoration:none;display:inline-block;}
button.registered-chip{background:none;cursor:pointer;font-family:inherit;}
.registered-chip .unreg-label{display:none;color:var(--hard);}
.registered-chip.unreg:hover{border-color:var(--hard);}
.registered-chip.unreg:hover .reg-label{display:none;}
.registered-chip.unreg:hover .unreg-label{display:inline;}
.c-reg{color:var(--easy);font-weight:600;}
.crow:last-child{border-bottom:none;}
.crow:hover{background:var(--surface-hover);}
.c-main{flex:1;}
.c-name{font-size:15px;font-weight:600;margin-bottom:3px;}
.c-name .badge{margin-left:8px;}
.c-meta{font-size:13px;color:var(--text-muted);}
.c-right{text-align:right;flex-shrink:0;}
.c-right .top{font-size:14px;font-weight:600;color:var(--accent);font-variant-numeric:tabular-nums;}
.c-right .bot{font-size:12px;color:var(--text-muted);}
.c-result{text-align:right;flex-shrink:0;min-width:120px;}
.c-result .rank{font-size:14px;font-weight:600;color:var(--text);}
.c-result .delta.up{color:var(--green);font-size:13px;font-weight:600;}
.c-result .delta.down{color:var(--red);font-size:13px;font-weight:600;}
.c-result .lbl{font-size:12px;color:var(--text-muted);}

/* ============================================================
   Single problem page
   ============================================================ */
.split{display:grid;grid-template-columns:1fr 1fr;gap:0;height:calc(100vh - 60px);}
.pane{overflow-y:auto;padding:28px 32px;}
.pane.left{border-right:1px solid var(--border);}
.pane.right{padding:0;display:flex;flex-direction:column;}

.live-banner{display:flex;align-items:center;gap:10px;margin-bottom:12px;
  padding:10px 14px;border:1px solid var(--hard);border-radius:9px;
  background:rgba(248,81,73,.08);color:var(--text);text-decoration:none;
  font-size:13.5px;transition:background .12s;}
.live-banner:hover{background:rgba(248,81,73,.14);}
.live-banner b{color:var(--hard);}
.live-dot{width:9px;height:9px;border-radius:50%;background:var(--hard);
  flex-shrink:0;animation:livepulse 1.6s ease-in-out infinite;}
@keyframes livepulse{0%,100%{opacity:1;}50%{opacity:.35;}}
.back-link{display:inline-block;margin-bottom:16px;font-size:13px;color:var(--text-muted);text-decoration:none;transition:color .12s;}
.back-link:hover{color:var(--text);}
.p-head{margin-bottom:18px;}
.p-head .p-title{font-size:22px;font-weight:700;margin-bottom:10px;}
.p-meta{display:flex;align-items:center;gap:12px;}
.diff{font-size:13px;font-weight:600;padding:3px 12px;border-radius:20px;}
.diff.easy{color:var(--easy);background:rgba(63,185,80,.12);}
.diff.med{color:var(--med);background:rgba(210,153,34,.12);}
.diff.hard{color:var(--hard);background:rgba(248,81,73,.12);}
.topic-pill{font-size:13px;color:var(--text-dim);background:var(--surface);border:1px solid var(--border);padding:3px 12px;border-radius:20px;}
.p-section{margin-top:22px;}
.p-section h3{font-size:15px;font-weight:600;margin-bottom:8px;color:var(--text);}
.p-body{font-size:15px;color:var(--text-dim);line-height:1.7;}
.p-body p{margin-bottom:12px;}
.p-body .m{color:var(--text);font-family:"SF Mono",Menlo,Consolas,monospace;font-size:14px;}
.example{background:var(--code-bg);border:1px solid var(--border);border-radius:9px;padding:14px 16px;margin-top:10px;font-size:14px;}
.example .lbl{color:var(--text-muted);font-weight:600;font-size:13px;margin-bottom:2px;}
.example .val{color:var(--text);font-family:"SF Mono",Menlo,Consolas,monospace;margin-bottom:10px;}
.example .val:last-child{margin-bottom:0;}
.constraints{font-size:14px;color:var(--text-dim);}
.constraints li{margin-left:18px;margin-bottom:4px;}
.constraints .m{color:var(--text);font-family:"SF Mono",Menlo,Consolas,monospace;font-size:13px;}

/* problem detail: type pill in the header */
.type-pill{font-size:13px;font-weight:600;color:var(--text-dim);background:var(--surface-2);
  border:1px solid var(--border);padding:3px 12px;border-radius:20px;text-transform:capitalize;}

/* rendered markdown statement */
.statement h2{font-size:15px;font-weight:600;color:var(--text);margin:22px 0 8px;}
.statement h3{font-size:14px;font-weight:600;color:var(--text);margin:18px 0 6px;}
.statement p{margin-bottom:12px;}
.statement ul,.statement ol{margin:0 0 12px 20px;}
.statement li{margin-bottom:4px;}
.statement code{font-family:"SF Mono",Menlo,Consolas,monospace;font-size:13px;
  color:var(--text);background:var(--code-bg);border:1px solid var(--border);
  border-radius:5px;padding:1px 5px;}
.statement pre{background:var(--code-bg);border:1px solid var(--border);border-radius:9px;
  padding:14px 16px;overflow-x:auto;margin-bottom:12px;}
.statement pre code{border:none;background:none;padding:0;font-size:13px;line-height:1.5;}
.statement table{border-collapse:collapse;margin-bottom:12px;font-size:14px;}
.statement th,.statement td{border:1px solid var(--border);padding:6px 12px;text-align:left;}
.statement th{color:var(--text);font-weight:600;}

/* sample example boxes (Codeforces-style) */
.sample{margin-bottom:16px;}
.sample-box{border:1px solid var(--border);border-radius:9px;overflow:hidden;margin-bottom:10px;}
.sample-box:last-child{margin-bottom:0;}
.sample-head{display:flex;align-items:center;justify-content:space-between;
  padding:7px 14px;background:var(--surface-2);border-bottom:1px solid var(--border);
  font-size:13px;font-weight:600;color:var(--text-dim);}
.sample-body{margin:0;padding:12px 14px;background:var(--code-bg);
  font-family:"SF Mono",Menlo,Consolas,monospace;font-size:13px;line-height:1.5;
  color:var(--text);white-space:pre;overflow-x:auto;}
.sample-score{color:var(--text-dim);font-size:13px;margin:6px 2px 2px;}

/* prediction training-data download */
.train-download{display:flex;align-items:center;gap:12px;margin:14px 0 4px;
  padding:11px 14px;background:var(--surface-2);border:1px solid var(--border);
  border-radius:9px;color:var(--text);text-decoration:none;transition:border-color .12s;}
.train-download:hover{border-color:var(--accent);}
.train-download b{font-size:14px;display:block;}
.train-icon{color:var(--accent);font-size:18px;}
.train-sub{color:var(--text-dim);font-size:12.5px;}

/* editor environment info tooltip */
.env-info{position:relative;display:inline-flex;margin-left:8px;}
.env-info-icon{width:16px;height:16px;border-radius:50%;border:1px solid var(--text-muted);
  color:var(--text-muted);font-size:11px;font-style:italic;font-family:Georgia,serif;
  display:inline-flex;align-items:center;justify-content:center;cursor:default;
  transition:all .12s;}
.env-info:hover .env-info-icon,.env-info-icon:focus{color:var(--accent);border-color:var(--accent);outline:none;}
.env-tip{position:absolute;top:calc(100% + 8px);left:-6px;
  display:none;flex-direction:column;gap:5px;z-index:6;width:280px;
  background:var(--surface-2);border:1px solid var(--border);border-radius:8px;
  padding:11px 13px;font-size:12.5px;box-shadow:0 4px 14px rgba(0,0,0,.45);}
.env-info:hover .env-tip,.env-info-icon:focus + .env-tip{display:flex;}
.env-tip b{font-size:13px;}
.env-line{color:var(--text-dim);}
.env-pkgs-head{color:var(--text);font-weight:600;margin-top:3px;}
.env-pkgs{display:flex;flex-wrap:wrap;gap:4px;}
.env-pkg{background:var(--code-bg);border:1px solid var(--border);border-radius:5px;
  padding:2px 6px;font-family:"SF Mono",Menlo,Consolas,monospace;font-size:11.5px;
  color:var(--text-dim);white-space:nowrap;}
.sample-score b{color:var(--text);}

.editor-bar{display:flex;align-items:center;gap:12px;padding:12px 18px;border-bottom:1px solid var(--border);background:var(--surface);}
.lang-label{font-size:14px;font-weight:500;color:var(--text-dim);}
.editor-area{flex:1;position:relative;background:var(--code-bg);}
.monaco-host{position:absolute;inset:0;display:none;}
.monaco-host.active{display:block;}
.editor-area textarea{
  width:100%;height:100%;background:var(--code-bg);color:var(--text);border:none;outline:none;resize:none;
  font-family:"SF Mono",Menlo,Consolas,"Roboto Mono",monospace;font-size:14px;line-height:1.7;padding:18px 20px;
}
.editor-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px;padding:12px 18px;border-top:1px solid var(--border);background:var(--surface);}
.btn:disabled{opacity:.4;cursor:not-allowed;}
.action-status{margin-right:auto;color:var(--text-dim);font-size:13px;}
.editor-results{max-height:40%;overflow-y:auto;border-top:1px solid var(--border);
  background:var(--surface);padding:12px 18px;font-size:13.5px;}
.result-head{font-weight:600;margin-bottom:8px;}
.result-error{color:var(--hard);}
.result-total{font-weight:700;font-size:15px;margin-bottom:8px;}
.result-total.ok{color:var(--easy);}
.result-total.bad{color:var(--hard);}
.verdict-grid{display:flex;flex-wrap:wrap;gap:5px;}
.verdict-badge{border-radius:5px;padding:2px 8px;font-size:11.5px;font-weight:600;
  font-family:"SF Mono",Menlo,Consolas,monospace;}
.verdict-badge.ok{background:rgba(63,185,80,.15);color:var(--easy);}
.verdict-badge.bad{background:rgba(248,81,73,.15);color:var(--hard);}
.run-case{border:1px solid var(--border);border-radius:8px;padding:9px 11px;margin-bottom:8px;}
.run-case-head{display:flex;justify-content:space-between;align-items:center;
  font-family:"SF Mono",Menlo,Consolas,monospace;font-size:12.5px;color:var(--text-dim);}
.run-output{background:var(--code-bg);border:1px solid var(--border);border-radius:6px;
  padding:7px 9px;margin:7px 0 0;font-size:12.5px;white-space:pre-wrap;}
.run-expected{color:var(--text-muted);font-size:11.5px;margin-top:6px;}
.btn{font-size:14px;font-weight:600;padding:8px 20px;border-radius:8px;cursor:pointer;border:1px solid var(--border);}
.btn-run{background:var(--surface-2);color:var(--text);}
.btn-run:hover{border-color:var(--text-muted);}
.btn-submit{background:var(--easy);color:#0d1117;border-color:var(--easy);}
.btn-submit:hover{background:#4cc85e;}

.results{border-top:1px solid var(--border);background:var(--surface);padding:16px 18px;max-height:230px;overflow-y:auto;}
.verdict{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:700;margin-bottom:12px;}
.verdict.accepted{color:var(--easy);}
.verdict-meta{font-size:13px;color:var(--text-muted);font-weight:400;}
.rtable{width:100%;font-size:13px;border-collapse:collapse;}
.rtable th{text-align:left;color:var(--text-muted);font-weight:600;padding:6px 10px;border-bottom:1px solid var(--border);text-transform:uppercase;font-size:11px;letter-spacing:.04em;}
.rtable td{padding:7px 10px;border-bottom:1px solid var(--border);color:var(--text-dim);font-family:"SF Mono",Menlo,Consolas,monospace;}
.rtable tr:last-child td{border-bottom:none;}
.v-ok{color:var(--easy);font-weight:600;}
.st-rank{display:inline-block;min-width:26px;color:var(--text-dim);font-weight:700;}
.st-rank.top{color:var(--accent);}

.cp-status{display:inline-block;width:44px;}

.card-head-note{float:right;color:var(--text-dim);font-size:13px;font-weight:400;}

.crow .st-main{display:flex;align-items:center;gap:12px;}
.crow .st-main .c-name{margin-bottom:0;}
.st-av{width:30px;height:30px;flex-shrink:0;}

.code-view{background:var(--surface-2);border:1px solid var(--border);border-radius:9px;
  padding:16px;font-family:ui-monospace,Consolas,monospace;font-size:13px;line-height:1.55;
  overflow-x:auto;white-space:pre;color:var(--text);margin:0;}
.verdict-chips{display:flex;flex-wrap:wrap;gap:6px;}
.vchip{min-width:28px;text-align:center;padding:4px 6px;border-radius:6px;font-size:12px;font-weight:700;}
.vchip.ok{background:rgba(63,185,80,.15);color:var(--easy);border:1px solid var(--easy);}
.vchip.bad{background:rgba(248,81,73,.12);color:var(--hard);border:1px solid var(--hard);}
/* ============================================================
   Site footer (shared across all pages)
   ============================================================ */
body{min-height:100vh;display:flex;flex-direction:column;}
/* flex children with margin:auto shrink-to-fit; force page containers back to full width */
.wrap,.layout{width:100%;}
.site-footer{margin-top:auto;border-top:1px solid var(--border);background:var(--surface);}
.footer-inner{max-width:1200px;margin:0 auto;padding:16px 28px;width:100%;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;}
.footer-copy{font-size:13px;color:var(--text-muted);}
.footer-links{display:flex;gap:22px;}
.footer-links a{font-size:13px;color:var(--text-dim);transition:color .15s;}
.footer-links a:hover{color:var(--text);}

/* ============================================================
   Legal pages (impressum / privacy / terms)
   ============================================================ */
.legal-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:26px 30px;}
.legal-card h2{font-size:16px;font-weight:600;margin:24px 0 8px;}
.legal-card h2:first-child{margin-top:0;}
.legal-card p{font-size:14.5px;color:var(--text-dim);margin-bottom:10px;}
.legal-card p:last-child{margin-bottom:0;}
.legal-card a{color:var(--accent);}
.legal-card a:hover{text-decoration:underline;}
.legal-note{font-size:13px;color:var(--text-muted);margin-top:20px;}

/* ============================================================
   Contact page
   ============================================================ */
.contact-form{display:flex;flex-direction:column;gap:14px;margin-top:18px;}
.contact-label{font-size:13px;font-weight:600;color:var(--text-dim);}
.contact-input,.contact-textarea{background:var(--code-bg);border:1px solid var(--border);
  border-radius:9px;padding:11px 14px;font-size:14.5px;color:var(--text);outline:none;
  font-family:inherit;width:100%;}
.contact-input:focus,.contact-textarea:focus{border-color:var(--accent);}
.contact-textarea{min-height:160px;resize:vertical;line-height:1.6;}
.contact-actions{display:flex;align-items:center;gap:14px;}
.contact-status{font-size:13.5px;min-height:18px;}
.contact-status.ok{color:var(--easy);}
.contact-status.bad{color:var(--hard);}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent);}
.btn-primary:hover{background:#2f6fd6;}

/* terms acceptance on the username picker */
.terms-accept{display:flex;align-items:flex-start;gap:9px;font-size:13.5px;
  color:var(--text-dim);cursor:pointer;user-select:none;}
.terms-accept input{margin-top:3px;accent-color:var(--accent);cursor:pointer;}
.terms-accept a{color:var(--accent);}
.terms-accept a:hover{text-decoration:underline;}

/* account deletion (own profile) */
.btn-danger{background:none;color:var(--hard);border-color:var(--hard);flex-shrink:0;}
.btn-danger:hover{background:rgba(248,81,73,.12);}
.btn-danger:disabled{opacity:.5;cursor:default;}

/* two-stage delete: bare muted link when collapsed, bordered panel only when open */
.danger-zone{display:block;margin-top:26px;text-align:right;}
.danger-toggle{font-size:12.5px;color:var(--text-muted);opacity:.7;}
.danger-toggle:hover{color:var(--hard);opacity:1;text-decoration:underline;}
.danger-panel{margin-top:12px;display:flex;flex-direction:column;gap:10px;text-align:left;
  background:var(--surface);border:1px solid rgba(248,81,73,.4);border-radius:12px;
  padding:16px 18px;}
.danger-explain{font-size:13.5px;color:var(--text-dim);max-width:640px;}
.danger-explain b{color:var(--hard);}
.danger-row{display:flex;gap:10px;align-items:center;}
.danger-row .contact-input{max-width:260px;}

/* error page (404/500/...) */
.error-page{max-width:520px;text-align:center;margin-top:80px;}
.error-code{font-size:64px;font-weight:700;color:var(--accent);line-height:1;
  font-variant-numeric:tabular-nums;}
.error-title{font-size:20px;font-weight:600;margin-top:10px;}
.error-sub{font-size:14px;color:var(--text-dim);margin:10px 0 24px;}
.error-page .btn-register-lg{display:inline-block;}

/* per-case stderr on editor Runs */
.run-stderr{margin-top:6px;}
.run-stderr summary{font-size:12px;color:var(--hard);cursor:pointer;user-select:none;}
.run-stderr summary:hover{text-decoration:underline;}
.run-stderr .run-output{margin-top:6px;border-color:rgba(248,81,73,.35);}


/* admin area */
.admin-nav{display:flex;gap:20px;margin-bottom:18px;}
.admin-nav a{color:var(--accent);font-size:14px;}
.admin-back{color:var(--text-muted);text-decoration:none;}
.admin-back:hover{color:var(--text);}
.admin-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;}
.admin-stat{background:var(--surface);border:1px solid var(--border);border-radius:10px;
  padding:14px;display:flex;flex-direction:column;gap:2px;}
.admin-stat b{font-size:22px;}
.admin-stat span{font-size:12px;color:var(--text-muted);}
.admin-stat.warn b{color:var(--hard);}
.admin-hint{margin-top:14px;font-size:13.5px;color:var(--text-dim);}
.admin-hint a{color:var(--accent);}
.admin-search{display:flex;gap:10px;margin-bottom:16px;}
.admin-search .contact-input{max-width:260px;}
.admin-select{max-width:160px;}
.admin-table{width:100%;border-collapse:collapse;font-size:13.5px;}
.admin-table th{text-align:left;color:var(--text-muted);font-size:11.5px;
  text-transform:uppercase;letter-spacing:.4px;padding:6px 10px;}
.admin-table td{padding:7px 10px;border-top:1px solid var(--border);}
.admin-table a{color:var(--accent);}
.admin-muted{color:var(--text-dim);}
.admin-badge{background:rgba(56,139,253,.15);color:var(--accent);border-radius:5px;
  padding:1px 7px;font-size:11px;font-weight:600;margin-left:6px;}
.admin-status{border-radius:5px;padding:2px 8px;font-size:11.5px;font-weight:600;}
.admin-status.judged{background:rgba(63,185,80,.15);color:var(--easy);}
.admin-status.queued,.admin-status.claimed{background:rgba(210,153,34,.15);color:var(--medium);}
.admin-status.failed{background:rgba(248,81,73,.15);color:var(--hard);}
.admin-message{margin-bottom:14px;}
.admin-message .card-head{display:flex;justify-content:space-between;align-items:center;}
.admin-msg-actions{display:flex;gap:16px;}
.admin-msg-body{font-size:13.5px;line-height:1.6;white-space:pre-wrap;word-break:break-word;
  color:var(--text-dim);margin:0;padding:10px 16px;font-family:inherit;}
.admin-pager{display:flex;justify-content:space-between;margin-top:14px;}
.admin-pager a{color:var(--accent);font-size:13.5px;}

/* ============================================================
   Mobile (single breakpoint, consumption-first)
   ============================================================ */
@media (max-width: 760px) {
  /* header: logo + auth on row one, nav scrolls on row two */
  header{height:auto;flex-wrap:wrap;padding:10px 16px;row-gap:8px;}
  .logo{margin-right:auto;font-size:20px;}
  nav.main{order:3;width:100%;gap:18px;overflow-x:auto;-webkit-overflow-scrolling:touch;}
  nav.main a{font-size:14px;white-space:nowrap;}

  /* fluid page width */
  .wrap{padding:0 14px;margin:18px auto;}
  .layout{padding:0 14px;margin:18px auto;}
  .page-title{font-size:22px;}

  /* wide content scrolls inside its card instead of the page */
  .card{overflow-x:auto;}
  .admin-table{min-width:640px;}

  /* problem page: statement stacks above the editor */
  .split{grid-template-columns:1fr;height:auto;}
  .pane{padding:20px 16px;}
  .pane.left{border-right:none;border-bottom:1px solid var(--border);}
  .pane.right{height:75vh;}

  /* home: sidebar drops below the main column */
  .layout{display:block;}
  .layout > * + *{margin-top:18px;}

  /* filters: label above its own scrollable chip line */
  .filter-group{flex-direction:column;align-items:stretch;gap:7px;margin-bottom:14px;}
  .filter-group > :first-child{font-size:11px;}
  .topics{width:100%;padding-right:34px;}
  /* right-edge fade as a swipe affordance over the chip row */
  .filter-group{position:relative;}
  .filter-group::after{content:"";position:absolute;right:-1px;bottom:0;height:40px;width:34px;
    background:linear-gradient(90deg,transparent,var(--bg));pointer-events:none;}
  .topics{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;
    padding-bottom:4px;scrollbar-width:none;}
  .topics::-webkit-scrollbar{display:none;}
  .topics .chip,.topics a{white-space:nowrap;flex-shrink:0;}
  .toolbar{flex-wrap:wrap;}
  .search-box{flex-basis:100%;max-width:none;}

  /* leaderboard: tighter columns, drop the title column */
  .row,.lb-head{padding:11px 12px;}
  .c-rank{width:30px;font-size:13.5px;}
  .c-user{gap:8px;min-width:0;}
  .c-user .name{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
  .c-rating{width:56px;font-size:13.5px;}
  .c-title{display:none;}
  .c-contests{width:38px;font-size:13px;}

  /* rows that assume horizontal room */
  .profile-head{flex-wrap:wrap;}
  .danger-row{flex-wrap:wrap;}
  .danger-row .contact-input{max-width:none;width:100%;}

  .faq h2{scroll-margin-top:112px;}

  /* admin */
  .admin-stats{grid-template-columns:repeat(2,1fr);}
  .admin-search{flex-wrap:wrap;}
  .admin-search .contact-input{max-width:none;width:100%;}
}

/* FAQ page */
.faq h2{font-size:17px;font-weight:700;margin:30px 0 6px;padding-bottom:8px;
  border-bottom:1px solid var(--border);scroll-margin-top:78px;}
.faq h2:first-child{margin-top:8px;}
.faq h3{font-size:14.5px;font-weight:600;margin:18px 0 6px;}
.faq p{font-size:14px;line-height:1.65;color:var(--text-dim);}
.faq p b{color:var(--text);}
.faq a{color:var(--accent);text-decoration:none;}
.faq a:hover{text-decoration:underline;}
.faq-links{display:flex;flex-direction:column;}
.faq-links a{padding:10px 18px;font-size:13.5px;color:var(--accent);text-decoration:none;
  border-bottom:1px solid var(--border);}
.faq-links a:last-child{border-bottom:none;}
.faq-links a:hover{background:var(--surface-hover);}

/* nav logo mark */
.logo{display:flex;align-items:center;}
.logo-mark{width:30px;height:30px;display:block;margin-right:10px;}

/* notification preferences */
.notify-row{display:flex;align-items:flex-start;gap:12px;padding:12px 18px;
  border-bottom:1px solid var(--border);cursor:pointer;}
.notify-row:last-child{border-bottom:none;}
.notify-row input{margin-top:3px;accent-color:var(--accent);}
.notify-row span{font-size:14px;display:flex;flex-direction:column;gap:2px;}
.notify-row small{font-size:12.5px;color:var(--text-muted);}

/* optional notify opt-in under the terms checkbox */
.notify-opt{margin-top:2px;}
.notify-opt span{color:var(--text-dim);}
.notify-opt em{color:var(--text-muted);font-style:normal;font-size:12px;}

/* contest rules note */
.contest-rules-note{font-size:13px;color:var(--text-dim);margin:14px 0 22px;
  padding:10px 14px;border:1px solid var(--border);border-radius:9px;
  background:var(--surface);}
.contest-rules-note a{color:var(--accent);text-decoration:underline;text-underline-offset:2px;}
.p-limits{font-size:12.5px;color:var(--text-muted);margin-top:8px;}

.run-output-empty { color: var(--muted, #8b93a7); font-style: italic; }

/* ---- profile: solved-problems summary strip + compact chip grid ---- */
.solved-summary{display:flex;flex-direction:column;gap:10px;margin:10px 18px 14px;padding-bottom:12px;border-bottom:1px solid var(--border);}
.solved-diffs{display:flex;gap:18px;align-items:center;font-size:13px;}
.solved-diff b{font-size:15px;margin-right:5px;color:var(--text);}
.solved-diff-label{font-weight:600;text-transform:capitalize;}
.solved-diff-label.easy{color:var(--easy);}
.solved-diff-label.medium{color:var(--med);}
.solved-diff-label.hard{color:var(--hard);}
.solved-topics{display:flex;flex-wrap:wrap;gap:6px 12px;font-size:12px;color:var(--text-muted);}
.solved-topic b{color:var(--text);margin-left:2px;}
.solved-grid-compact{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:6px;margin:0 18px 10px;}
.solved-chip-compact{padding:6px 10px;gap:7px;font-size:12.5px;min-width:0;}
.solved-chip-compact .solved-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;}
.solved-chip-compact .solved-score{font-size:11.5px;}
.solved-dot{width:7px;height:7px;border-radius:50%;flex:none;}
.solved-dot.easy{background:var(--easy);}
.solved-dot.medium{background:var(--med);}
.solved-dot.hard{background:var(--hard);}
.solved-hidden{display:none;}
.solved-show-all{display:block;width:calc(100% - 36px);margin:4px 18px 12px;padding:8px 0;font-size:13px;
  background:transparent;color:var(--text-muted);border:1px solid var(--border);border-radius:8px;cursor:pointer;}
.solved-show-all:hover{border-color:var(--text-dim);color:var(--text);}

.solved-types{margin-left:auto;display:flex;gap:14px;font-size:12px;color:var(--text-muted);}
.solved-type b{color:var(--text);margin-right:4px;}
.solved-type-tag{font-size:10px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  padding:1px 5px;border-radius:4px;border:1px solid var(--border);color:var(--text-muted);flex:none;}
.solved-type-tag.prediction{color:var(--accent);border-color:var(--accent);}
.solved-type-tag.optimization{color:var(--med);border-color:var(--med);}