/* InfoSys Academy — design system v2
   A learning platform for Systems Engineering, Data Engineering and AI/ML.
   No framework, no build. Custom properties drive theming. */

:root {
  /* surfaces */
  --bg: #080a11;
  --bg-soft: #0d111c;
  --panel: #121826;
  --panel-2: #1a2132;
  --panel-3: #222b40;
  --line: #28324a;
  --line-soft: #1c2435;
  /* text */
  --txt: #eaf0fb;
  --txt-dim: #a3afc7;
  --txt-faint: #6f7c98;
  /* brand */
  --brand: #5b8cff;
  --brand-2: #8b5cff;
  --accent: #2dd4bf;
  --gold: #f7c948;
  --danger: #ff6b6b;
  --ok: #45d483;
  --sys: #5b8cff;   /* systems engineering */
  --data: #2dd4bf;  /* data engineering */
  --ai: #c084fc;    /* ai / ml */
  /* shape */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  --shadow: 0 24px 60px -30px rgba(0,0,0,.85);
  --shadow-sm: 0 10px 28px -18px rgba(0,0,0,.7);
  --ring: 0 0 0 1px color-mix(in srgb, var(--brand) 55%, transparent), 0 16px 40px -18px color-mix(in srgb, var(--brand) 55%, transparent);
  --mono: "JetBrains Mono", "SFMono-Regular", "Fira Code", Consolas, monospace;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --display: "Space Grotesk", var(--sans);
}

[data-theme="light"] {
  --bg: #eef2fa;
  --bg-soft: #e6ecf7;
  --panel: #ffffff;
  --panel-2: #f3f6fc;
  --panel-3: #e9eef8;
  --line: #dde4f0;
  --line-soft: #e7ecf5;
  --txt: #0f1626;
  --txt-dim: #475068;
  --txt-faint: #7b86a0;
  --shadow: 0 24px 60px -34px rgba(30,44,90,.40);
  --shadow-sm: 0 10px 26px -18px rgba(30,44,90,.30);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background:
    radial-gradient(1100px 540px at 88% -12%, color-mix(in srgb, var(--brand-2) 22%, transparent), transparent 60%),
    radial-gradient(900px 460px at -8% 6%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 55%),
    radial-gradient(700px 700px at 50% 120%, color-mix(in srgb, var(--brand) 12%, transparent), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  color: var(--txt);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  letter-spacing: -.1px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}
h1, h2, h3, .brand .name, .hero h1, .stat .v, .price .amt, .cert .who { font-family: var(--display); }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
::selection { background: color-mix(in srgb, var(--brand) 38%, transparent); }

/* scrollbars */
* { scrollbar-width: thin; scrollbar-color: var(--panel-3) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--panel-3); border-radius: 99px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: var(--line); background-clip: padding-box; }

/* entrance motion */
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes floatGlow { 0%,100% { opacity: .8; transform: translate(0,0) scale(1); } 50% { opacity: 1; transform: translate(-12px,10px) scale(1.06); } }
.content > * { animation: fadeUp .5s cubic-bezier(.2,.7,.2,1) both; }
.content > *:nth-child(2) { animation-delay: .04s; }
.content > *:nth-child(3) { animation-delay: .08s; }
.content > *:nth-child(4) { animation-delay: .12s; }
.content > *:nth-child(5) { animation-delay: .16s; }
@media (prefers-reduced-motion: reduce) { *, .content > * { animation: none !important; transition: none !important; } }

/* ---------- layout ---------- */
.app { display: grid; grid-template-columns: 264px 1fr; min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; align-self: start; height: 100vh;
  border-right: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--bg-soft), color-mix(in srgb, var(--bg) 92%, var(--panel)));
  padding: 22px 16px; overflow-y: auto;
}
.main { min-width: 0; }
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 14px;
  padding: 14px 30px;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line-soft);
}
.content { padding: 32px 38px 96px; max-width: 1140px; }

/* ---------- brand ---------- */
.brand { display: flex; align-items: center; gap: 11px; margin-bottom: 24px; cursor: pointer; }
.brand .mark {
  width: 40px; height: 40px; border-radius: 12px;
  background: conic-gradient(from 210deg, var(--brand), var(--brand-2), var(--accent), var(--brand));
  display: grid; place-items: center; font-weight: 800; color: #fff; font-family: var(--display);
  box-shadow: 0 10px 26px -8px var(--brand-2), inset 0 1px 0 rgba(255,255,255,.25);
  transition: transform .25s cubic-bezier(.2,.7,.2,1);
}
.brand:hover .mark { transform: rotate(-6deg) scale(1.05); }
.brand .name { font-weight: 700; letter-spacing: -.3px; font-size: 16px; }
.brand .name small { display: block; font-weight: 500; color: var(--txt-faint); font-size: 10.5px; letter-spacing: .5px; font-family: var(--sans); }

/* ---------- nav ---------- */
.nav-group { margin: 20px 0 7px; padding-left: 11px; color: var(--txt-faint); font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.4px; }
.nav-item {
  position: relative;
  display: flex; align-items: center; gap: 11px;
  padding: 9px 12px; border-radius: 11px; color: var(--txt-dim);
  cursor: pointer; font-size: 14px; font-weight: 500; user-select: none;
  border: 1px solid transparent; transition: background .15s, color .15s, transform .15s;
}
.nav-item:hover { background: color-mix(in srgb, var(--panel) 70%, transparent); color: var(--txt); }
.nav-item.active {
  background: linear-gradient(100deg, color-mix(in srgb, var(--brand) 22%, transparent), color-mix(in srgb, var(--brand-2) 14%, transparent));
  color: #fff; border-color: color-mix(in srgb, var(--brand) 32%, var(--line));
}
.nav-item.active::before {
  content: ""; position: absolute; left: -16px; top: 50%; transform: translateY(-50%);
  width: 4px; height: 20px; border-radius: 0 4px 4px 0;
  background: linear-gradient(180deg, var(--brand), var(--brand-2));
}
.nav-item .ic { width: 18px; text-align: center; opacity: .95; font-size: 15px; }
.nav-item .badge { margin-left: auto; font-size: 11px; font-weight: 600; color: var(--txt-faint); }
.nav-item.active .badge { color: color-mix(in srgb, #fff 80%, var(--brand)); }

/* ---------- buttons ---------- */
.btn {
  appearance: none; border: 1px solid var(--line); background: var(--panel);
  color: var(--txt); padding: 9px 16px; border-radius: 11px; font-weight: 600;
  cursor: pointer; font-size: 14px; font-family: inherit; letter-spacing: -.1px;
  transition: transform .15s cubic-bezier(.2,.7,.2,1), box-shadow .15s, border-color .15s, background .15s;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
}
.btn:hover { border-color: color-mix(in srgb, var(--brand) 60%, var(--line)); transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.btn:active { transform: translateY(0); }
.btn.primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); border: none; color: #fff; box-shadow: 0 10px 26px -14px var(--brand-2); }
.btn.primary:hover { box-shadow: 0 14px 32px -12px var(--brand-2); }
.btn.ghost { background: transparent; border-color: var(--line); }
.btn.ghost:hover { background: color-mix(in srgb, var(--panel) 60%, transparent); }
.btn.gold { background: linear-gradient(135deg, #ffd968, var(--gold) 45%, #e0a23a); color: #3a2700; border: none; box-shadow: 0 10px 26px -14px var(--gold); }
.btn.gold:hover { box-shadow: 0 14px 32px -12px var(--gold); }
.btn.sm { padding: 6px 12px; font-size: 13px; border-radius: 9px; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; box-shadow: none; }

/* ---------- cards ---------- */
.card {
  position: relative;
  background: linear-gradient(180deg, color-mix(in srgb, var(--panel) 96%, #fff 4%), var(--panel));
  border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
}
.grid { display: grid; gap: 18px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

.hero {
  border-radius: var(--radius-lg); padding: 38px; margin-bottom: 28px; position: relative; overflow: hidden;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--panel) 80%, var(--brand) 4%), #0c1120);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  isolation: isolate;
}
.hero::before {
  content: ""; position: absolute; inset: -40% 30% auto -10%; height: 460px; z-index: -1;
  background: radial-gradient(420px 280px at 80% 10%, color-mix(in srgb, var(--brand-2) 55%, transparent), transparent 65%),
              radial-gradient(360px 240px at 20% 40%, color-mix(in srgb, var(--accent) 38%, transparent), transparent 60%);
  filter: blur(6px); animation: floatGlow 11s ease-in-out infinite;
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; opacity: .5;
  background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--bg) 60%, transparent));
}
.hero h1 { margin: 0 0 10px; font-size: 32px; line-height: 1.1; letter-spacing: -.8px; }
.hero p { color: var(--txt-dim); margin: 0 0 18px; max-width: 640px; font-size: 15.5px; }

.stat { display: flex; flex-direction: column; gap: 2px; }
.stat .v { font-size: 27px; font-weight: 700; letter-spacing: -.6px; background: linear-gradient(135deg, var(--txt), var(--txt-dim)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat .l { font-size: 11.5px; color: var(--txt-faint); text-transform: uppercase; letter-spacing: .7px; font-weight: 600; }

/* ---------- track / course tiles ---------- */
.track-tile { cursor: pointer; transition: transform .2s cubic-bezier(.2,.7,.2,1), border-color .2s, box-shadow .2s; position: relative; overflow: hidden; }
.track-tile::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0; transition: opacity .25s;
  background: radial-gradient(420px 160px at 50% -20%, color-mix(in srgb, var(--accent-c, var(--brand)) 22%, transparent), transparent 70%);
}
.track-tile:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent-c, var(--brand)) 55%, var(--line)); box-shadow: 0 26px 56px -30px color-mix(in srgb, var(--accent-c, var(--brand)) 55%, #000); }
.track-tile:hover::after { opacity: 1; }
.track-tile .tag { font-size: 11px; font-weight: 700; letter-spacing: .8px; text-transform: uppercase; }
.track-tile h3 { margin: 8px 0 6px; font-size: 19px; letter-spacing: -.3px; }
.track-tile p { color: var(--txt-dim); font-size: 14px; margin: 0 0 14px; }
.track-tile .stripe { position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--accent-c, var(--brand)); }

.progress { height: 8px; background: color-mix(in srgb, var(--panel-2) 80%, #000); border-radius: 99px; overflow: hidden; box-shadow: inset 0 1px 2px rgba(0,0,0,.4); }
.progress > i { display: block; height: 100%; background: linear-gradient(90deg, var(--brand), var(--accent)); border-radius: 99px; transition: width .6s cubic-bezier(.2,.7,.2,1); box-shadow: 0 0 12px -2px var(--brand); }

.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 11px; border-radius: 99px; font-size: 12px; font-weight: 600; background: color-mix(in srgb, var(--panel-2) 80%, transparent); border: 1px solid var(--line); color: var(--txt-dim); transition: border-color .15s, color .15s, background .15s; }
.chip.sys { color: var(--sys); border-color: color-mix(in srgb, var(--sys) 40%, var(--line)); }
.chip.data { color: var(--data); border-color: color-mix(in srgb, var(--data) 40%, var(--line)); }
.chip.ai { color: var(--ai); border-color: color-mix(in srgb, var(--ai) 40%, var(--line)); }
.chip.pro { color: var(--gold); border-color: color-mix(in srgb, var(--gold) 45%, var(--line)); background: color-mix(in srgb, var(--gold) 10%, transparent); }
.chip.done { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 45%, var(--line)); }

/* ---------- lesson ---------- */
.lesson h2 { font-size: 24px; letter-spacing: -.5px; margin-top: 32px; }
.lesson h3 { font-size: 18px; margin-top: 24px; }
.lesson p, .lesson li { color: var(--txt-dim); }
.lesson strong { color: var(--txt); }
.callout { border-left: 3px solid var(--brand); background: linear-gradient(100deg, color-mix(in srgb, var(--brand) 10%, var(--panel)), var(--panel)); padding: 13px 17px; border-radius: 0 12px 12px 0; margin: 16px 0; }
.callout.warn { border-color: var(--gold); background: linear-gradient(100deg, color-mix(in srgb, var(--gold) 10%, var(--panel)), var(--panel)); }
.callout.tip { border-color: var(--accent); background: linear-gradient(100deg, color-mix(in srgb, var(--accent) 10%, var(--panel)), var(--panel)); }

/* ---------- code ---------- */
.code-tabs { display: flex; gap: 5px; flex-wrap: wrap; margin: 16px 0 0; }
.code-tab { padding: 6px 13px; border-radius: 9px 9px 0 0; font-family: var(--mono); font-size: 12px; cursor: pointer; color: var(--txt-faint); border: 1px solid transparent; border-bottom: none; transition: color .15s, background .15s; }
.code-tab:hover { color: var(--txt-dim); }
.code-tab.active { background: #0a0e18; color: var(--txt); border-color: var(--line); }
pre.code {
  margin: 0; background: linear-gradient(180deg, #0b0f1a, #080b14); border: 1px solid var(--line); border-radius: 0 12px 12px 12px;
  padding: 17px 19px; overflow-x: auto; font-family: var(--mono); font-size: 13px; line-height: 1.7; color: #cdd6f4;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.03);
}
pre.code .cm { color: #6b7691; font-style: italic; }
pre.code .kw { color: #c084fc; }
pre.code .st { color: #7ee787; }
pre.code .fn { color: #5b8cff; }
.copy-btn { float: right; font-size: 11px; }

/* ---------- quiz ---------- */
.quiz-q { border: 1px solid var(--line); border-radius: 14px; padding: 17px 19px; margin: 14px 0; background: linear-gradient(180deg, color-mix(in srgb, var(--panel) 96%, #fff 4%), var(--panel)); }
.quiz-q .qn { font-weight: 700; margin-bottom: 12px; }
.opt { display: flex; gap: 11px; align-items: center; padding: 11px 14px; border: 1px solid var(--line); border-radius: 11px; margin: 8px 0; cursor: pointer; transition: border-color .15s, background .15s, transform .12s; }
.opt:hover { border-color: var(--brand); transform: translateX(2px); }
.opt.sel { border-color: var(--brand); background: color-mix(in srgb, var(--brand) 13%, transparent); }
.opt.correct { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 15%, transparent); }
.opt.wrong { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 13%, transparent); }
.opt .dot { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--txt-faint); flex: none; transition: border-color .15s, background .15s; }
.opt.sel .dot { border-color: var(--brand); background: var(--brand); box-shadow: 0 0 0 4px color-mix(in srgb, var(--brand) 22%, transparent); }
.opt.correct .dot { border-color: var(--ok); background: var(--ok); }
.opt.wrong .dot { border-color: var(--danger); background: var(--danger); }
.explain { font-size: 13px; color: var(--txt-dim); margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); }

/* ---------- glossary / table ---------- */
.search { width: 100%; padding: 11px 15px; border-radius: 12px; border: 1px solid var(--line); background: color-mix(in srgb, var(--panel) 80%, transparent); color: var(--txt); font-size: 14px; font-family: inherit; transition: border-color .15s, box-shadow .15s; }
.search::placeholder { color: var(--txt-faint); }
.search:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent); }
.term { border-bottom: 1px solid var(--line-soft); padding: 14px 2px; transition: padding-left .15s; }
.term:hover { padding-left: 8px; }
.term dt { font-weight: 700; color: var(--txt); }
.term dd { margin: 4px 0 0; color: var(--txt-dim); font-size: 14px; }
.term .cat { font-size: 11px; color: var(--txt-faint); text-transform: uppercase; letter-spacing: .6px; }

/* ---------- AI assistant ---------- */
.ai-fab { position: fixed; right: 24px; bottom: 24px; z-index: 60; width: 60px; height: 60px; border-radius: 50%; border: none; cursor: pointer; background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; font-size: 25px; box-shadow: 0 16px 34px -10px var(--brand-2), inset 0 1px 0 rgba(255,255,255,.3); transition: transform .2s cubic-bezier(.2,.7,.2,1); }
.ai-fab:hover { transform: translateY(-3px) scale(1.06); }
.ai-fab:active { transform: scale(.96); }
.ai-panel { position: fixed; right: 24px; bottom: 96px; z-index: 60; width: 384px; max-width: calc(100vw - 32px); height: 548px; max-height: calc(100vh - 130px); background: var(--panel); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); display: none; flex-direction: column; overflow: hidden; }
.ai-panel.open { display: flex; animation: fadeUp .25s cubic-bezier(.2,.7,.2,1) both; }
.ai-head { padding: 14px 16px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 10px; background: linear-gradient(180deg, color-mix(in srgb, var(--brand) 10%, var(--panel)), var(--panel)); }
.ai-body { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.ai-msg { padding: 10px 14px; border-radius: 14px; font-size: 14px; max-width: 86%; line-height: 1.5; animation: fadeUp .3s cubic-bezier(.2,.7,.2,1) both; }
.ai-msg.user { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.ai-msg.bot { background: var(--panel-2); align-self: flex-start; border-bottom-left-radius: 4px; }
.ai-foot { padding: 12px; border-top: 1px solid var(--line); display: flex; gap: 8px; }
.ai-foot input { flex: 1; }
.ai-suggest { display: flex; flex-wrap: wrap; gap: 6px; padding: 0 12px 10px; }
.ai-suggest .chip { cursor: pointer; }

/* ---------- modal ---------- */
.modal-bg { position: fixed; inset: 0; background: rgba(4,7,14,.74); backdrop-filter: blur(6px); z-index: 80; display: none; place-items: center; padding: 20px; }
.modal-bg.open { display: grid; animation: fadeUp .2s ease both; }
.modal { background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 28px; max-width: 460px; width: 100%; box-shadow: var(--shadow); }

/* ---------- certificate ---------- */
.cert {
  border: 3px solid transparent; border-radius: 18px; padding: 44px; text-align: center; position: relative; overflow: hidden;
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    conic-gradient(from 180deg, var(--gold), var(--brand), var(--accent), var(--brand-2), var(--gold)) border-box;
  box-shadow: var(--shadow);
}
.cert::before { content: ""; position: absolute; inset: 0; background: radial-gradient(500px 200px at 50% -10%, color-mix(in srgb, var(--gold) 14%, transparent), transparent 70%); pointer-events: none; }
.cert .seal { width: 70px; height: 70px; margin: 0 auto 16px; border-radius: 50%; background: conic-gradient(from 0deg, #ffe07a, var(--gold), #e0a23a, var(--gold)); display: grid; place-items: center; color: #3a2700; font-weight: 800; font-size: 25px; box-shadow: 0 10px 26px -10px var(--gold), inset 0 1px 0 rgba(255,255,255,.4); }
.cert h2 { font-size: 13px; letter-spacing: 3px; text-transform: uppercase; color: var(--txt-faint); margin: 0; }
.cert .who { font-size: 31px; font-weight: 700; margin: 14px 0 6px; letter-spacing: -.6px; }
.cert .for { color: var(--txt-dim); }
.cert .track-name { font-size: 22px; font-weight: 700; color: var(--brand); margin: 6px 0 18px; font-family: var(--display); }
.cert .meta { display: flex; justify-content: space-around; margin-top: 24px; font-size: 12px; color: var(--txt-faint); }

/* ---------- misc ---------- */
.row { display: flex; align-items: center; gap: 12px; }
.between { justify-content: space-between; }
.wrap { flex-wrap: wrap; }
.muted { color: var(--txt-faint); }
.tag-pill { font-size: 11px; padding: 2px 9px; border-radius: 7px; background: var(--panel-2); color: var(--txt-dim); border: 1px solid var(--line); font-weight: 600; }
.divider { height: 1px; background: linear-gradient(90deg, transparent, var(--line), transparent); margin: 24px 0; border: 0; }
.xp-toast { position: fixed; top: 18px; left: 50%; transform: translateX(-50%) translateY(-8px); z-index: 90; background: var(--panel); border: 1px solid var(--ok); color: var(--txt); padding: 12px 22px; border-radius: 13px; box-shadow: var(--shadow); font-weight: 600; opacity: 0; pointer-events: none; transition: opacity .3s, transform .3s cubic-bezier(.2,.7,.2,1); }
.xp-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.lock { opacity: .55; }

/* ---------- auth ---------- */
.auth-wrap { display: grid; place-items: center; min-height: 70vh; padding: 20px 0; }
.auth-card { width: 100%; max-width: 420px; }
.flabel { display: block; font-size: 13px; font-weight: 600; color: var(--txt-dim); margin: 12px 0 5px; }
.auth-card input, .auth-card select { width: 100%; }
.auth-err { color: var(--danger); font-size: 13px; min-height: 18px; margin: 8px 0 2px; }

/* ---------- language ranker ---------- */
.ranker { display: flex; flex-direction: column; gap: 6px; }
.rank-row { display: flex; align-items: center; gap: 10px; padding: 9px 13px; border: 1px solid var(--line); border-radius: 11px; background: var(--panel); transition: border-color .15s, transform .12s; }
.rank-row:hover { border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); transform: translateX(2px); }
.rank-num { width: 24px; height: 24px; flex: none; display: grid; place-items: center; border-radius: 8px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; font-size: 12px; font-weight: 800; }
.rank-name { flex: 1; font-weight: 600; font-size: 14px; }

/* ---------- pricing ---------- */
.plan { position: relative; display: flex; flex-direction: column; transition: transform .2s cubic-bezier(.2,.7,.2,1), border-color .2s, box-shadow .2s; }
.plan:hover { transform: translateY(-4px); }
.plan-hot { border-color: color-mix(in srgb, var(--gold) 50%, var(--line)); box-shadow: 0 22px 56px -26px color-mix(in srgb, var(--gold) 45%, transparent); }
.plan-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: linear-gradient(135deg, #ffd968, var(--gold), #e0a23a); color: #3a2700; font-size: 11px; font-weight: 800; padding: 4px 13px; border-radius: 99px; letter-spacing: .4px; box-shadow: 0 8px 20px -8px var(--gold); }
.price { display: flex; align-items: baseline; gap: 4px; margin: 4px 0; }
.price .amt { font-size: 32px; font-weight: 700; letter-spacing: -.6px; }
.price .per { color: var(--txt-faint); font-size: 13px; }
.feat { list-style: none; padding: 0; margin: 10px 0 0; }
.feat li { position: relative; padding: 6px 0 6px 24px; font-size: 13px; color: var(--txt-dim); }
.feat li::before { content: "✓"; position: absolute; left: 0; top: 6px; width: 16px; height: 16px; border-radius: 50%; background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); font-weight: 800; font-size: 10px; display: grid; place-items: center; }

/* ---------- career roadmap ---------- */
.roadmap { position: relative; margin-left: 8px; }
.roadmap::before { content: ""; position: absolute; left: 18px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(180deg, var(--line), color-mix(in srgb, var(--brand) 30%, var(--line)), var(--line)); }
.road-step { position: relative; display: flex; gap: 16px; padding: 10px 0; cursor: pointer; }
.road-dot { width: 38px; height: 38px; flex: none; border-radius: 50%; display: grid; place-items: center; font-weight: 800; background: var(--panel-2); border: 2px solid var(--line); color: var(--txt-dim); z-index: 1; transition: transform .15s; }
.road-step:hover .road-dot { transform: scale(1.08); }
.road-step.done .road-dot { background: linear-gradient(135deg, var(--ok), #2da866); border-color: transparent; color: #04210f; }
.road-step.next .road-dot { border-color: var(--brand); color: var(--brand); box-shadow: 0 0 0 4px color-mix(in srgb, var(--brand) 22%, transparent); }
.road-body { flex: 1; background: var(--panel); border: 1px solid var(--line); border-radius: 13px; padding: 13px 17px; transition: border-color .15s, transform .15s; }
.road-step:hover .road-body { border-color: var(--brand); transform: translateX(3px); }
.road-step.next .road-body { border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); }

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .grid.cols-3, .grid.cols-2, .grid.cols-4 { grid-template-columns: 1fr; }
  .content { padding: 22px 16px 90px; }
  .hero { padding: 28px; }
  .hero h1 { font-size: 26px; }
}