/* Learnify web app — dark-monochrome premium design system.
   Matches the iOS app (Theme.swift): near-black canvas, white text, near-white
   accent, white-fill CTA on near-black ink. "Dark by design. Clear by choice." */
:root{
  /* legacy --blue names kept as aliases -> near-white accent (safety net for any inline var(--blue)) */
  --blue:#F7F7FA; --blue-600:#F7F7FA; --blue-500:#C7CCD3; --blue-700:#E6E6EA; --blue-50:rgba(247,247,250,.10); --blue-100:rgba(247,247,250,.16);
  --accent:#F7F7FA; --accent-deep:#9E9EA8; --cta:#F7F7FA; --cta-ink:#0D0D0F;
  --ink:#FFFFFF; --ink-2:rgba(255,255,255,.72); --ink-3:rgba(255,255,255,.60); --ink-4:rgba(255,255,255,.45);
  --bg:#0B0B0D; --surface:#17171A; --elevated:#212126; --line:#2A2A30; --line-2:#202024;
  --green:#45DB6B; --green-bg:rgba(69,219,107,.14); --red:#F5545E; --red-bg:rgba(245,84,94,.14);
  --amber:#E8C24A; --amber-bg:rgba(232,194,74,.14); --purple:#A78BFA; --purple-bg:rgba(167,139,250,.14); --indigo:#9AA0FF;
  --flame:#FF9E2E;
  --r-lg:22px; --r-md:16px; --r-sm:10px;
  --sh-sm:0 1px 2px rgba(0,0,0,.40), 0 1px 3px rgba(0,0,0,.30);
  --sh-md:0 8px 24px -8px rgba(0,0,0,.55), 0 2px 8px -2px rgba(0,0,0,.40);
  --sh-lg:0 24px 60px -20px rgba(0,0,0,.70);
  --max:1320px;
  --display:'Nunito',system-ui,-apple-system,sans-serif;
  /* category accents (mirror iOS NewsCategory) — retuned to read on dark */
  --cat-ai:#A78BFA; --cat-security:#F5545E; --cat-startups:#45DB6B; --cat-devtools:#7AA2FF; --cat-research:#9AA0FF; --cat-cloud:#38BDF8;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;background:var(--bg);color:var(--ink);
  font-family:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;-webkit-font-smoothing:antialiased;line-height:1.5}
h1,h2,h3,.logo{font-family:var(--display),'Inter',system-ui,sans-serif}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:rgba(247,247,250,.22);color:#fff}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.muted{color:var(--ink-3)}
.btn{display:inline-flex;align-items:center;gap:8px;font:inherit;font-weight:700;font-size:14px;cursor:pointer;
  border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;padding:10px 16px;transition:.15s;white-space:nowrap}
.btn:hover{border-color:#3A3A42;background:var(--elevated);box-shadow:var(--sh-sm)}
.btn.primary{background:var(--cta);border-color:var(--cta);color:var(--cta-ink)}
.btn.primary:hover{background:#fff;box-shadow:0 10px 26px -10px rgba(247,247,250,.45)}
.btn.block{width:100%;justify-content:center;padding:12px}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:700;border-radius:999px;padding:4px 11px}
.cat{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;
  border-radius:8px;padding:4px 9px;color:#fff}
.xp{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:800;color:var(--green);background:var(--green-bg);border-radius:8px;padding:3px 9px}

/* ---------- top nav ---------- */
.nav{position:sticky;top:0;z-index:40;background:rgba(11,11,13,.82);backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--max);margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:22px}
.logo{display:flex;align-items:center;gap:9px;font-weight:900;font-size:19px;letter-spacing:-.4px}
.logo .ts{width:34px;height:34px;border-radius:9px;background:#0B0B0D;border:1px solid rgba(69,219,107,.55);color:var(--green);
  display:grid;place-items:center;font-weight:900;font-size:17px;font-family:var(--display);box-shadow:0 0 14px rgba(69,219,107,.30)}
.nav-links{display:flex;gap:4px;margin-left:6px}
.nav-links a{font-weight:700;font-size:14.5px;color:var(--ink-3);padding:8px 12px;border-radius:9px;position:relative}
.nav-links a:hover{color:var(--ink);background:var(--elevated)}
.nav-links a.active{color:#fff}
.nav-links a.active::after{content:"";position:absolute;left:12px;right:12px;bottom:-13px;height:2.5px;background:var(--accent);border-radius:2px}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.nav-search{display:flex;align-items:center;gap:7px;color:var(--ink-3);background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:13.5px;cursor:pointer}
.nav-search:hover{border-color:#3A3A42;color:var(--ink-2)}
.streak-pill{display:inline-flex;align-items:center;gap:6px;font-weight:800;font-size:13.5px;border:1px solid var(--line);border-radius:11px;padding:7px 13px;background:var(--surface)}
.streak-pill .fl{color:var(--flame)}
.avatar{width:38px;height:38px;border-radius:50%;object-fit:cover;border:2px solid var(--line);box-shadow:var(--sh-sm);background:var(--elevated)}
.nav-user{display:flex;align-items:center;gap:5px;cursor:pointer}
.nav-user svg{color:var(--ink-3)}
/* guest "Sign in" nav button */
.nav-signin{display:inline-flex;align-items:center;gap:7px;font-weight:800;font-size:14px;background:var(--cta);color:var(--cta-ink);border:none;border-radius:11px;padding:9px 16px;cursor:pointer;transition:.15s}
.nav-signin:hover{background:#fff;box-shadow:0 10px 26px -10px rgba(247,247,250,.45)}

/* ---------- generic card ---------- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm)}
.card.pad{padding:18px}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 0 14px}
.section-head h2{font-size:19px;font-weight:900;letter-spacing:-.3px;margin:0;display:flex;align-items:center;gap:9px}
.section-head .count{font-size:13px;font-weight:800;color:var(--ink-4);background:var(--elevated);border-radius:7px;padding:2px 8px}
.section-head .see{font-size:13.5px;font-weight:700;color:var(--accent)}
.section-head .see:hover{text-decoration:underline}

/* story / article cards */
.story{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;transition:.18s;box-shadow:var(--sh-sm)}
.story:hover{transform:translateY(-3px);box-shadow:var(--sh-md);border-color:#3A3A42}
.story .thumb{aspect-ratio:16/9;width:100%;object-fit:cover;background:linear-gradient(135deg,#17171A,#212126);position:relative}
.story .thumb-wrap{position:relative;overflow:hidden}
.story .thumb-wrap .cat{position:absolute;top:10px;left:10px;z-index:2}
.story .thumb-wrap .save{position:absolute;top:9px;right:9px;z-index:2;width:30px;height:30px;border-radius:8px;background:rgba(11,11,13,.66);backdrop-filter:blur(6px);display:grid;place-items:center;color:var(--ink-2);cursor:pointer;border:1px solid var(--line)}
.story .thumb-wrap .save:hover{background:rgba(11,11,13,.85);color:#fff}
.story .thumb-wrap .save.on{color:var(--green);border-color:rgba(69,219,107,.5)}
.story .s-body{padding:14px 15px;display:flex;flex-direction:column;gap:7px;flex:1}
.story h3{font-size:15.5px;font-weight:800;line-height:1.32;margin:0;letter-spacing:-.2px;color:#fff}
.story:hover h3{color:var(--accent)}
.story p{font-size:13.2px;color:var(--ink-3);margin:0;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.story .meta{margin-top:auto;display:flex;align-items:center;gap:8px;font-size:12px;color:var(--ink-4);font-weight:600}
.story .meta .dot{width:3px;height:3px;border-radius:50%;background:var(--ink-4)}

/* progress widgets */
.ring{--p:0;width:130px;height:130px;border-radius:50%;display:grid;place-items:center;
  background:conic-gradient(var(--accent) calc(var(--p)*1%), #212126 0);position:relative}
.ring::before{content:"";position:absolute;inset:11px;border-radius:50%;background:var(--surface)}
.ring .v{position:relative;text-align:center}
.ring .v b{font-size:30px;font-weight:900;letter-spacing:-1px}
.ring .v span{display:block;font-size:11px;color:var(--ink-3);font-weight:700}
.xpbar{height:8px;border-radius:6px;background:#212126;overflow:hidden}
.xpbar>i{display:block;height:100%;background:linear-gradient(90deg,var(--accent-deep),var(--accent));border-radius:6px}
.stat3{display:flex;gap:8px;text-align:center}
.stat3>div{flex:1;padding:6px 4px}
.stat3 b{font-size:19px;font-weight:900;display:block}
.stat3 span{font-size:11px;color:var(--ink-3);font-weight:700}
.lvl-badge{width:42px;height:42px;display:grid;place-items:center;color:var(--cta-ink);font-weight:900;font-size:15px;
  background:linear-gradient(135deg,#ffffff,#C7CCD3);clip-path:polygon(50% 0,93% 25%,93% 75%,50% 100%,7% 75%,7% 25%);}

/* weekly bars */
.bars{display:flex;align-items:flex-end;gap:8px;height:90px;padding-top:8px}
.bars .b{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;height:100%;justify-content:flex-end}
.bars .b i{width:100%;max-width:22px;background:#2A2A30;border-radius:5px 5px 0 0;min-height:4px}
.bars .b.on i{background:var(--accent)}
.bars .b span{font-size:11px;color:var(--ink-4);font-weight:700}

/* leaderboard */
.lb-row{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid var(--line-2)}
.lb-row:last-child{border-bottom:none}
.lb-rank{width:24px;height:24px;border-radius:7px;display:grid;place-items:center;font-weight:900;font-size:12.5px;background:var(--elevated);color:var(--ink-3)}
.lb-rank.g1{background:rgba(232,194,74,.16);color:var(--amber)}.lb-rank.g2{background:rgba(199,204,211,.16);color:#C7CCD3}.lb-rank.g3{background:rgba(204,135,79,.18);color:#CC874F}
.lb-av{width:30px;height:30px;border-radius:50%;background:var(--elevated);object-fit:cover}
.lb-name{font-weight:800;font-size:13.5px}
.lb-pro{font-size:10px;font-weight:900;color:var(--cta-ink);background:var(--accent);border-radius:5px;padding:1px 6px;text-transform:uppercase}
.lb-xp{margin-left:auto;display:flex;align-items:center;gap:10px;font-size:12.5px;font-weight:800}
.lb-xp .st{color:var(--flame);font-weight:800}

/* mastery rows */
.mastery .m{margin-bottom:11px}
.mastery .m .top{display:flex;justify-content:space-between;font-size:13px;font-weight:700;margin-bottom:5px}
.mastery .m .top b{color:var(--accent);font-weight:900}

/* layout grids */
.layout-3{display:grid;grid-template-columns:248px 1fr 318px;gap:24px;padding:24px 24px 70px;max-width:var(--max);margin:0 auto;align-items:start}
.layout-2{display:grid;grid-template-columns:1fr 330px;gap:24px;padding:24px 24px 70px;max-width:var(--max);margin:0 auto;align-items:start}
.col-side{display:flex;flex-direction:column;gap:18px;position:sticky;top:80px}
@media(max-width:1180px){.layout-3{grid-template-columns:1fr 320px}.layout-3 .col-left{display:none}}
@media(max-width:960px){.layout-3,.layout-2{grid-template-columns:1fr}.col-side{position:static}.nav-links{display:none}}

.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:760px){.grid4{grid-template-columns:repeat(2,1fr)}.grid3{grid-template-columns:1fr}}

/* side nav list (saved page) */
.sidelist a{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:11px;font-weight:700;font-size:14px;color:var(--ink-2);cursor:pointer}
.sidelist a:hover{background:var(--elevated)}
.sidelist a.active{background:var(--elevated);color:var(--accent)}
.sidelist a .n{margin-left:auto;font-size:12.5px;color:var(--ink-4);font-weight:800}
.sidelist a.active .n{color:var(--accent)}

/* hero (Latest) */
.hero{padding:30px 0 10px}
.hero .day{display:inline-flex;align-items:center;gap:9px;font-size:13px;font-weight:700;color:var(--ink-3);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:5px 13px}
.hero h1{font-size:46px;font-weight:900;letter-spacing:-1.5px;line-height:1.04;margin:16px 0 10px}
.hero h1 .u{color:var(--accent);position:relative}
.hero h1 .u::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:8px;background:rgba(69,219,107,.32);z-index:-1;border-radius:3px}
.hero p{font-size:16px;color:var(--ink-3);max-width:46ch;margin:0 0 18px}
.hero .actions{display:flex;gap:10px;flex-wrap:wrap}

/* toast */
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(20px);background:var(--elevated);color:#fff;font-weight:700;font-size:14px;padding:11px 18px;border-radius:12px;box-shadow:var(--sh-lg);border:1px solid var(--line);opacity:0;transition:.25s;z-index:80;pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* loading shimmer */
.sk{background:linear-gradient(100deg,#17171A 30%,#212126 50%,#17171A 70%);background-size:200% 100%;animation:sh 1.2s infinite;border-radius:8px}
@keyframes sh{to{background-position:-200% 0}}
@media(prefers-reduced-motion:reduce){*{animation-duration:.001ms!important;transition-duration:.001ms!important}}

/* ---------- robust mobile / overflow guards ---------- */
html,body{overflow-x:hidden;width:100%}
/* let grid/flex children shrink below their content width (kills right-edge clipping) */
.layout-2,.layout-3,.col-main,.col-side,.col-left,.card,.story,.grid4,.grid3,.s-body{min-width:0}
.story h3,.story p,.lb-name,.section-head h2{overflow-wrap:anywhere}
@media(max-width:560px){
  .layout-2,.layout-3{padding:16px 14px 56px}
  .nav-inner{padding:10px 14px;gap:10px}
  .nav-right{gap:8px}
  .streak-pill{padding:6px 9px;font-size:12px}
  .nav-search{display:none}
  .hero h1{font-size:32px;letter-spacing:-1px}
  .hero-grid,.featured,.cb,#quizOpts{grid-template-columns:1fr!important}
  .grid4,.grid3{grid-template-columns:1fr!important}
  .a-title{font-size:28px}
}