/* ============================================================
   Data Analytics Academy — design system
   A friendly, modern, dependency-free stylesheet.
   ============================================================ */

:root {
  /* Brand palette */
  --indigo:   #6366f1;
  --indigo-d: #4f46e5;
  --violet:   #8b5cf6;
  --teal:     #14b8a6;
  --amber:    #f59e0b;
  --rose:     #f43f5e;
  --green:    #22c55e;

  /* Track accents */
  --excel:   #21a366;
  --sql:     #2f6fb0;
  --python:  #f6c343;
  --powerbi: #f2c811;

  /* Light theme surfaces */
  --bg:        #f7f8fc;
  --bg-soft:   #eef1f8;
  --card:      #ffffff;
  --card-2:    #fbfcfe;
  --ink:       #1c2333;
  --ink-soft:  #4a536b;
  --muted:     #7c869c;
  --line:      #e6e9f2;
  --line-2:    #eef1f7;
  --shadow:    0 1px 2px rgba(20,28,60,.05), 0 8px 24px rgba(20,28,60,.06);
  --shadow-lg: 0 12px 40px rgba(30,40,90,.16);
  --code-bg:   #f3f4fb;
  --ok-bg:     #e9fbf1; --ok-ink:#0f7a47;
  --warn-bg:   #fff7e6; --warn-ink:#9a6400;
  --err-bg:    #ffeef0; --err-ink:#b4233a;

  --radius:    16px;
  --radius-sm: 10px;
  --maxw:      1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

[data-theme="dark"] {
  --bg:        #0e1117;
  --bg-soft:   #141925;
  --card:      #171c28;
  --card-2:    #1b2130;
  --ink:       #eef1f8;
  --ink-soft:  #c2c9da;
  --muted:     #8b94a8;
  --line:      #262d3d;
  --line-2:    #20273500;
  --shadow:    0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.35);
  --shadow-lg: 0 18px 50px rgba(0,0,0,.5);
  --code-bg:   #0c1018;
  --ok-bg:     #0f2a1e; --ok-ink:#46d693;
  --warn-bg:   #2a2410; --warn-ink:#e9be5e;
  --err-bg:    #2a1418; --err-ink:#ff8095;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}
a { color: var(--indigo); text-decoration: none; }
a:hover { text-decoration: underline; }
h1,h2,h3,h4 { line-height: 1.25; letter-spacing: -.02em; }
.muted { color: var(--muted); }
code, kbd { font-family: var(--mono); }

/* ---------- Top navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 18px;
  padding: 12px max(20px, calc((100vw - var(--maxw)) / 2));
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav .brand { display: flex; align-items: center; gap: 10px; cursor: pointer; }
.nav .brand .mark {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  font-size: 18px; color: #fff;
  background: linear-gradient(135deg, var(--indigo), var(--violet));
  box-shadow: 0 6px 16px rgba(99,102,241,.4);
}
.nav .brand b { font-size: 16px; }
.nav .brand .sub { font-size: 11px; color: var(--muted); margin-top: -3px; }
.nav .links { display: flex; gap: 4px; margin-left: auto; }
.nav .links a {
  padding: 7px 13px; border-radius: 999px; color: var(--ink-soft);
  font-size: 14px; font-weight: 500;
}
.nav .links a:hover { background: var(--bg-soft); text-decoration: none; color: var(--ink); }
.icon-btn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); cursor: pointer; font-size: 16px;
  display: grid; place-items: center; transition: .15s;
}
.icon-btn:hover { background: var(--bg-soft); transform: translateY(-1px); }

/* ---------- Layout shell ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.view { animation: fade .35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 64px 0 40px; text-align: center;
}
.hero::before {
  content: ""; position: absolute; inset: -40% 0 auto 0; height: 460px; z-index: -1;
  background:
    radial-gradient(60% 60% at 20% 10%, rgba(99,102,241,.20), transparent 60%),
    radial-gradient(50% 50% at 85% 0%, rgba(20,184,166,.18), transparent 60%),
    radial-gradient(40% 60% at 60% 30%, rgba(139,92,246,.16), transparent 60%);
  filter: blur(6px);
}
.hero .pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow);
  color: var(--ink-soft); margin-bottom: 22px;
}
.hero .pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px rgba(34,197,94,.18); }
.hero h1 { font-size: clamp(32px, 5.4vw, 56px); margin: 0 0 16px; }
.hero h1 .grad {
  background: linear-gradient(120deg, var(--indigo), var(--violet) 45%, var(--teal));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p.lead { font-size: clamp(16px, 2.2vw, 20px); color: var(--ink-soft); max-width: 640px; margin: 0 auto 30px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  padding: 12px 22px; border-radius: 12px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; transition: .16s; font-family: inherit;
}
.btn.primary { background: linear-gradient(135deg, var(--indigo), var(--violet)); color: #fff; box-shadow: 0 8px 22px rgba(99,102,241,.38); }
.btn.primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(99,102,241,.5); text-decoration: none; }
.btn.ghost { background: var(--card); border-color: var(--line); color: var(--ink); box-shadow: var(--shadow); }
.btn.ghost:hover { transform: translateY(-2px); text-decoration: none; }
.btn.sm { padding: 8px 14px; font-size: 13px; border-radius: 9px; }
.btn:disabled { opacity: .55; cursor: default; transform: none !important; }

/* ---------- Stats strip ---------- */
.stats { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin: 40px 0 8px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 26px; box-shadow: var(--shadow); min-width: 130px; }
.stat b { font-size: 26px; display: block; }
.stat span { font-size: 13px; color: var(--muted); }

/* ---------- Section heads ---------- */
.section { padding: 44px 0; }
.section > .head { text-align: center; margin-bottom: 30px; }
.section > .head h2 { font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 8px; }
.section > .head p { color: var(--ink-soft); margin: 0; }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--indigo); }

/* ---------- Phase headers ---------- */
.phase-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin: 30px 0 16px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.phase-head .phase-dot { width: 12px; height: 12px; border-radius: 50%; align-self: center; }
.phase-head h3 { margin: 0; font-size: 19px; }
.phase-head p { margin: 0; font-size: 13.5px; color: var(--muted); flex: 1; min-width: 220px; }

/* ---------- Track cards ---------- */
.tracks { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.track {
  position: relative; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); cursor: pointer; transition: .2s; overflow: hidden;
  display: flex; flex-direction: column;
}
.track:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.track::after { content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; background: var(--accent); }
.track .ico { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; font-size: 26px; margin-bottom: 14px; background: color-mix(in srgb, var(--accent) 14%, transparent); }
.track .step { font-size: 12px; font-weight: 700; color: var(--accent); letter-spacing: .06em; text-transform: uppercase; }
.track h3 { margin: 4px 0 6px; font-size: 20px; }
.track p { margin: 0 0 16px; font-size: 14px; color: var(--ink-soft); flex: 1; }
.track .meta { display: flex; align-items: center; gap: 12px; font-size: 12.5px; color: var(--muted); margin-bottom: 12px; }
.track .meta .tag { background: var(--bg-soft); padding: 3px 9px; border-radius: 999px; }
.track .progress { height: 7px; border-radius: 999px; background: var(--bg-soft); overflow: hidden; }
.track .progress > i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: 999px; transition: width .5s ease; }
.track .pct { font-size: 12px; color: var(--muted); margin-top: 7px; display: flex; justify-content: space-between; }

/* ---------- Roadmap ---------- */
.roadmap { position: relative; max-width: 760px; margin: 0 auto; }
.roadmap::before { content: ""; position: absolute; left: 27px; top: 8px; bottom: 8px; width: 2px; background: var(--line); }
.rstep { position: relative; padding: 0 0 26px 64px; }
.rstep .bullet { position: absolute; left: 14px; top: 0; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-size: 13px; font-weight: 700; background: var(--accent); box-shadow: 0 0 0 5px var(--bg); }
.rstep h4 { margin: 2px 0 4px; font-size: 17px; }
.rstep p { margin: 0; font-size: 14px; color: var(--ink-soft); }
.rstep .skills { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; }
.rstep .skills span { font-size: 12px; background: var(--bg-soft); border: 1px solid var(--line); padding: 3px 10px; border-radius: 999px; color: var(--ink-soft); }

/* ---------- Feature grid ---------- */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 16px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.feature .fi { font-size: 24px; margin-bottom: 10px; }
.feature h4 { margin: 0 0 6px; }
.feature p { margin: 0; font-size: 14px; color: var(--ink-soft); }

/* =====================================================
   TRACK / LESSON PAGE
   ===================================================== */
.track-hero { padding: 34px 0 18px; display: flex; gap: 20px; align-items: center; flex-wrap: wrap; }
.track-hero .big-ico { width: 76px; height: 76px; border-radius: 20px; display: grid; place-items: center; font-size: 38px; background: color-mix(in srgb, var(--accent) 16%, transparent); flex: none; }
.track-hero h1 { margin: 0 0 4px; font-size: clamp(26px,4vw,38px); }
.track-hero p { margin: 0; color: var(--ink-soft); max-width: 560px; }
.track-bar { display: flex; align-items: center; gap: 14px; margin: 6px 0 26px; }
.track-bar .progress { flex: 1; height: 9px; border-radius: 999px; background: var(--bg-soft); overflow: hidden; }
.track-bar .progress > i { display: block; height: 100%; background: var(--accent); border-radius: 999px; transition: width .5s; }

.crumbs { font-size: 13px; color: var(--muted); margin: 14px 0 0; }
.crumbs a { color: var(--muted); }

.lesson-layout { display: grid; grid-template-columns: 270px 1fr; gap: 28px; align-items: start; }
.lesson-nav { position: sticky; top: 70px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; box-shadow: var(--shadow); max-height: calc(100vh - 90px); overflow: auto; }
.lesson-nav .group-title { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); padding: 12px 10px 6px; }
.lesson-nav .ln {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 9px;
  cursor: pointer; font-size: 14px; color: var(--ink-soft); transition: .12s;
}
.lesson-nav .ln:hover { background: var(--bg-soft); }
.lesson-nav .ln.active { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--ink); font-weight: 600; }
.lesson-nav .ln .tick { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--line); flex: none; display: grid; place-items: center; font-size: 11px; }
.lesson-nav .ln.done .tick { background: var(--accent); border-color: var(--accent); color: #fff; }
.lesson-nav .ln .n { font-size: 11px; color: var(--muted); min-width: 16px; }

/* Lesson body */
.lesson { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.lesson .lhead { padding: 24px 28px 18px; border-bottom: 1px solid var(--line); }
.lesson .lhead .kicker { font-size: 12.5px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .06em; }
.lesson .lhead h2 { margin: 6px 0 0; font-size: 26px; }
.lesson .lhead .mins { font-size: 13px; color: var(--muted); margin-top: 6px; }
.lesson .body { padding: 22px 28px; }
.lesson .body p { color: var(--ink-soft); }
.lesson .body h3 { margin: 26px 0 10px; font-size: 18px; }
.lesson .body ul, .lesson .body ol { color: var(--ink-soft); padding-left: 22px; }
.lesson .body li { margin: 5px 0; }
.lesson .body code { background: var(--code-bg); padding: 2px 7px; border-radius: 6px; font-size: 13px; color: var(--indigo-d); border: 1px solid var(--line); }
[data-theme="dark"] .lesson .body code { color: #aab4ff; }
.lesson .body strong { color: var(--ink); }
.lesson .body table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
.lesson .body th, .lesson .body td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.lesson .body th { background: var(--bg-soft); font-weight: 600; }

.callout { border-radius: 12px; padding: 14px 18px; margin: 18px 0; border: 1px solid var(--line); display: flex; gap: 12px; font-size: 14px; }
.callout .ci { font-size: 18px; flex: none; }
.callout.tip { background: var(--ok-bg); border-color: color-mix(in srgb, var(--green) 30%, transparent); color: var(--ok-ink); }
.callout.note { background: color-mix(in srgb, var(--indigo) 8%, transparent); border-color: color-mix(in srgb, var(--indigo) 30%, transparent); }
.callout.warn { background: var(--warn-bg); border-color: color-mix(in srgb, var(--amber) 35%, transparent); color: var(--warn-ink); }

/* Code blocks / examples */
.example { margin: 16px 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--card-2); }
.example .ex-head { display: flex; align-items: center; gap: 8px; padding: 9px 14px; background: var(--bg-soft); font-size: 12.5px; font-weight: 600; color: var(--ink-soft); border-bottom: 1px solid var(--line); }
.example .ex-head .lang { margin-left: auto; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
pre.code { margin: 0; padding: 14px 16px; overflow-x: auto; font-family: var(--mono); font-size: 13px; line-height: 1.6; color: var(--ink); }
pre.code .cm { color: var(--muted); font-style: italic; }
pre.code .kw { color: var(--violet); font-weight: 600; }
pre.code .st { color: var(--green); }
pre.code .nm { color: var(--amber); }
pre.code .fn { color: var(--indigo); }

/* ---------- Interactive runner ---------- */
.runner { margin: 22px 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); }
.runner .rh { display: flex; align-items: center; gap: 10px; padding: 10px 14px; background: var(--bg-soft); border-bottom: 1px solid var(--line); }
.runner .rh .label { font-size: 13px; font-weight: 600; display: flex; align-items: center; gap: 7px; }
.runner .rh .spacer { flex: 1; }
.runner textarea {
  width: 100%; border: 0; resize: vertical; min-height: 130px; padding: 14px 16px;
  font-family: var(--mono); font-size: 13.5px; line-height: 1.6; background: var(--card); color: var(--ink);
  outline: none; display: block; tab-size: 2;
}
.runner .out { border-top: 1px solid var(--line); padding: 0; background: var(--code-bg); max-height: 360px; overflow: auto; }
.runner .out pre { margin: 0; padding: 14px 16px; font-family: var(--mono); font-size: 13px; white-space: pre-wrap; color: var(--ink); }
.runner .out .err { color: var(--err-ink); }
.runner .out table { border-collapse: collapse; width: 100%; font-size: 13px; }
.runner .out th, .runner .out td { border: 1px solid var(--line); padding: 6px 11px; text-align: left; }
.runner .out th { background: var(--bg-soft); position: sticky; top: 0; }
.runner .status { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; }

/* Excel grid */
.xgrid { border: 1px solid var(--line); border-radius: 10px; overflow: auto; }
.xgrid table { border-collapse: collapse; font-size: 13px; width: 100%; }
.xgrid th, .xgrid td { border: 1px solid var(--line); padding: 0; min-width: 84px; height: 30px; text-align: center; }
.xgrid th { background: var(--bg-soft); color: var(--muted); font-weight: 600; font-size: 11px; position: sticky; top: 0; }
.xgrid td.rowh { background: var(--bg-soft); color: var(--muted); font-weight: 600; min-width: 30px; }
.xgrid td input { width: 100%; height: 28px; border: 0; background: transparent; text-align: center; font-family: var(--font); font-size: 13px; color: var(--ink); outline: none; padding: 0 4px; }
.xgrid td input:focus { background: color-mix(in srgb, var(--excel) 12%, transparent); box-shadow: inset 0 0 0 2px var(--excel); }
.xgrid td.computed input { color: var(--excel); font-weight: 600; }

/* Quiz */
.quiz { margin: 22px 0; border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; background: var(--card-2); }
.quiz .q { font-weight: 600; margin-bottom: 14px; display: flex; gap: 8px; }
.quiz .q .qn { color: var(--accent); }
.quiz .opt {
  display: flex; align-items: center; gap: 11px; padding: 11px 14px; border: 1px solid var(--line);
  border-radius: 10px; margin-bottom: 9px; cursor: pointer; transition: .12s; font-size: 14.5px; background: var(--card);
}
.quiz .opt:hover { border-color: var(--accent); background: var(--bg-soft); }
.quiz .opt .mk { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--line); flex: none; display: grid; place-items: center; font-size: 12px; }
.quiz .opt.correct { border-color: var(--green); background: var(--ok-bg); color: var(--ok-ink); }
.quiz .opt.correct .mk { background: var(--green); border-color: var(--green); color: #fff; }
.quiz .opt.wrong { border-color: var(--rose); background: var(--err-bg); color: var(--err-ink); }
.quiz .opt.wrong .mk { background: var(--rose); border-color: var(--rose); color: #fff; }
.quiz .opt.disabled { pointer-events: none; opacity: .85; }
.quiz .explain { font-size: 13.5px; color: var(--ink-soft); margin-top: 4px; padding: 10px 14px; border-left: 3px solid var(--accent); background: var(--bg-soft); border-radius: 0 8px 8px 0; }

/* Lesson footer nav */
.lesson .lfoot { display: flex; align-items: center; gap: 12px; padding: 18px 28px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.lesson .lfoot .spacer { flex: 1; }
.mark-btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 11px; font-weight: 600; font-size: 14px; cursor: pointer; border: 1px solid var(--accent); background: transparent; color: var(--accent); transition: .15s; font-family: inherit; }
.mark-btn:hover { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.mark-btn.done { background: var(--accent); color: #fff; }

.msg-inline { font-size: 13px; padding: 8px 12px; border-radius: 8px; display: inline-flex; align-items: center; gap: 7px; }
.msg-inline.ok { background: var(--ok-bg); color: var(--ok-ink); }
.msg-inline.err { background: var(--err-bg); color: var(--err-ink); }

/* spinner */
.spin { width: 15px; height: 15px; border: 2px solid color-mix(in srgb, var(--accent) 35%, transparent); border-top-color: var(--accent); border-radius: 50%; animation: sp .7s linear infinite; }
@keyframes sp { to { transform: rotate(360deg); } }

/* confetti dot toast */
.toast { position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%) translateY(20px); opacity: 0; background: var(--ink); color: var(--bg); padding: 12px 20px; border-radius: 12px; font-size: 14px; font-weight: 600; box-shadow: var(--shadow-lg); z-index: 200; transition: .3s; pointer-events: none; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Footer ---------- */
.site-foot { border-top: 1px solid var(--line); margin-top: 50px; padding: 30px 0; text-align: center; color: var(--muted); font-size: 13.5px; }
.site-foot a { color: var(--ink-soft); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-nav { position: static; max-height: none; order: 2; }
  .nav .links a:not(.keep) { display: none; }
}
@media (max-width: 520px) {
  .hero { padding: 40px 0 24px; }
  .stat { padding: 14px 18px; min-width: 104px; }
  .lesson .body, .lesson .lhead, .lesson .lfoot { padding-left: 18px; padding-right: 18px; }
}

/* ---------- Level pills ---------- */
.lvl { font-size: 10.5px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; padding: 2px 8px; border-radius: 999px; color: var(--lc); background: color-mix(in srgb, var(--lc) 14%, transparent); border: 1px solid color-mix(in srgb, var(--lc) 35%, transparent); vertical-align: middle; }

/* ---------- Python chart output ---------- */
.out .charts { display: flex; flex-wrap: wrap; gap: 10px; padding: 0 12px 12px; background: var(--card); }
.chart-img { max-width: 100%; border-radius: 10px; border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow); }

/* ---------- SQL schema panel + result ---------- */
.schema-panel { padding: 12px 16px; background: var(--bg-soft); border-top: 1px solid var(--line); font-family: var(--mono); font-size: 12.5px; line-height: 1.9; }
.schema-panel b { color: var(--sql); }
.btn.success { background: var(--green); color: #fff; border-color: var(--green); }
.btn.success:hover { filter: brightness(1.05); transform: translateY(-1px); }

/* ---------- My Progress page ---------- */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin: 8px 0 24px; }
.kpi { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); }
.kpi .kpi-ico { font-size: 22px; }
.kpi b { display: block; font-size: 26px; margin: 6px 0 2px; }
.kpi span { font-size: 13px; color: var(--muted); display: block; }
.kpi small { display: block; margin-top: 4px; }
.progress.sm { height: 7px; border-radius: 999px; background: var(--bg-soft); overflow: hidden; margin: 10px 0 6px; }
.progress.sm > i { display: block; height: 100%; background: var(--indigo); border-radius: 999px; transition: width .5s; }
.kpi small { font-size: 11.5px; }

.prog-2col { display: grid; grid-template-columns: 1.4fr 1fr; gap: 18px; }
.card-box { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; box-shadow: var(--shadow); }
.card-box h3 { margin: 0 0 14px; }
.chart-wrap { position: relative; height: 200px; margin-bottom: 16px; }
.tb-row { display: flex; align-items: center; gap: 10px; margin: 9px 0; font-size: 14px; }
.tb-row .tb-ico { width: 22px; text-align: center; }
.tb-row .tb-name { min-width: 132px; }
.tb-row .progress.sm { margin: 0; }

.badges { display: grid; grid-template-columns: repeat(auto-fill, minmax(84px, 1fr)); gap: 12px; }
.badge { text-align: center; padding: 12px 6px; border-radius: 12px; border: 1px solid var(--line); background: var(--card-2); transition: .15s; }
.badge.earned { border-color: color-mix(in srgb, var(--amber) 50%, var(--line)); background: color-mix(in srgb, var(--amber) 8%, transparent); }
.badge.locked { opacity: .45; filter: grayscale(1); }
.badge .be { font-size: 26px; }
.badge .bn { font-size: 11px; margin-top: 4px; font-weight: 600; }

/* ---------- Dashboard builder ---------- */
.dash { border: 1px solid var(--line); border-radius: 14px; padding: 16px; background: var(--card); box-shadow: var(--shadow); margin: 18px 0; }
.dash-controls { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.dash-controls label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; font-weight: 600; color: var(--muted); }
.dash-controls select { padding: 8px 10px; border-radius: 9px; border: 1px solid var(--line); background: var(--card-2); color: var(--ink); font-family: inherit; font-size: 14px; outline: none; cursor: pointer; }
.dash-controls select:focus { border-color: var(--violet); }
.dash-kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 12px; margin-bottom: 16px; }
.dash-kpi { background: var(--bg-soft); border-radius: 12px; padding: 12px 14px; }
.dash-kpi b { display: block; font-size: 22px; }
.dash-kpi span { font-size: 12px; color: var(--muted); }
.dash-chart { position: relative; height: 280px; }

/* ---------- Review ---------- */
.rev-src { margin-left: auto; font-size: 11px; color: var(--muted); background: var(--bg-soft); padding: 2px 9px; border-radius: 999px; white-space: nowrap; }
.quiz .q { align-items: center; }

/* ---------- Search box / glossary ---------- */
.search-box { width: 100%; padding: 13px 16px; border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font-size: 15px; font-family: inherit; outline: none; box-shadow: var(--shadow); margin-bottom: 18px; }
.search-box:focus { border-color: var(--indigo); }
.gl-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; padding-bottom: 40px; }
.gl-item { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; box-shadow: var(--shadow); }
.gl-term { font-weight: 700; margin-bottom: 6px; }
.gl-item p { margin: 0; font-size: 14px; color: var(--ink-soft); }
.gl-tag { font-size: 10px; text-transform: uppercase; letter-spacing: .05em; background: var(--bg-soft); color: var(--muted); padding: 2px 7px; border-radius: 999px; margin-left: 4px; font-weight: 600; }

/* ---------- Certificate ---------- */
.cert-tools { display: flex; gap: 12px; margin: 18px 0; flex-wrap: wrap; align-items: center; }
.certificate { background: linear-gradient(135deg, #fbfcff, #eef1fb); border-radius: 18px; padding: 10px; box-shadow: var(--shadow-lg); margin-bottom: 50px; }
[data-theme="dark"] .certificate { background: linear-gradient(135deg, #1a2030, #11151f); }
.cert-inner { border: 2px solid var(--indigo); border-radius: 14px; padding: 46px 30px; text-align: center; position: relative; }
.cert-seal { font-size: 46px; }
.cert-kicker { letter-spacing: .22em; text-transform: uppercase; font-size: 13px; color: var(--muted); margin-top: 8px; }
.cert-name { font-size: 38px; font-weight: 800; margin: 16px 0 6px; color: var(--ink); font-family: Georgia, "Times New Roman", serif; }
.cert-sub { color: var(--muted); }
.cert-title { font-size: 24px; font-weight: 700; margin: 8px 0 26px; background: linear-gradient(120deg, var(--indigo), var(--violet)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.cert-foot { display: flex; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 16px; color: var(--ink-soft); font-size: 13px; }

/* ---------- Command palette ---------- */
.palette-overlay { position: fixed; inset: 0; z-index: 300; background: rgba(15,20,35,.5); backdrop-filter: blur(3px); display: none; align-items: flex-start; justify-content: center; padding-top: 14vh; }
.palette-overlay.show { display: flex; animation: fade .15s ease; }
.palette { width: min(560px, 92vw); background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow-lg); overflow: hidden; }
.palette-input { width: 100%; border: 0; padding: 16px 18px; font-size: 16px; background: var(--card); color: var(--ink); outline: none; border-bottom: 1px solid var(--line); font-family: inherit; }
.palette-list { max-height: 320px; overflow: auto; }
.palette-item { display: flex; justify-content: space-between; gap: 12px; padding: 11px 18px; cursor: pointer; font-size: 14.5px; }
.palette-item.active, .palette-item:hover { background: color-mix(in srgb, var(--indigo) 12%, transparent); }
kbd { background: var(--bg-soft); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 6px; padding: 1px 6px; font-size: 12px; }

@media (max-width: 760px) { .prog-2col { grid-template-columns: 1fr; } }

/* ---------- Print (certificate) ---------- */
@media print {
  .nav, .crumbs, .cert-tools, .site-foot, #toast { display: none !important; }
  body, .certificate { background: #fff !important; }
  .certificate { box-shadow: none; margin: 0; }
}

/* ---------- Beginner landing: outcomes, FAQ, CTA band ---------- */
.check-list { list-style: none; padding: 0; margin: 0; }
.check-list li { position: relative; padding: 8px 0 8px 30px; font-size: 14.5px; color: var(--ink-soft); border-bottom: 1px solid var(--line-2); }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 8px; width: 20px; height: 20px; border-radius: 50%; background: color-mix(in srgb, var(--green) 18%, transparent); color: var(--ok-ink); display: grid; place-items: center; font-size: 12px; font-weight: 700; }
.check-list b { color: var(--ink); }
.faq { padding: 10px 0; border-bottom: 1px solid var(--line-2); }
.faq b { display: block; margin-bottom: 3px; }
.faq p { margin: 0; font-size: 13.5px; }
.cta-band { background: linear-gradient(135deg, color-mix(in srgb, var(--indigo) 12%, var(--card)), color-mix(in srgb, var(--violet) 12%, var(--card))); border: 1px solid var(--line); border-radius: var(--radius); padding: 40px 24px; box-shadow: var(--shadow); }
.cta-band h2 { margin: 0 0 6px; font-size: clamp(22px, 3vw, 30px); }

/* ---------- My Path: goal, plan, readiness ---------- */
.goal-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.goal-card { display: flex; flex-direction: column; align-items: center; gap: 8px; text-align: center; padding: 18px 14px; border: 1.5px solid var(--line); border-radius: 14px; background: var(--card-2); cursor: pointer; font-family: inherit; font-size: 13.5px; color: var(--ink-soft); transition: .15s; }
.goal-card:hover { border-color: var(--indigo); }
.goal-card.sel { border-color: var(--indigo); background: color-mix(in srgb, var(--indigo) 12%, transparent); color: var(--ink); font-weight: 600; }
.goal-card .ge { font-size: 28px; }
.hours-row { display: flex; gap: 10px; flex-wrap: wrap; }
.hours-chip { padding: 9px 16px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--card-2); cursor: pointer; font-family: inherit; font-size: 14px; color: var(--ink-soft); transition: .15s; }
.hours-chip:hover { border-color: var(--indigo); }
.hours-chip.sel { border-color: var(--indigo); background: var(--indigo); color: #fff; font-weight: 600; }
.plan-stat { display: flex; align-items: baseline; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line-2); }
.plan-stat b { font-size: 22px; min-width: 120px; }
.plan-stat span { font-size: 13px; color: var(--muted); }
.plan-stat.hl b { color: var(--green); }
.ready-ring { width: 150px; height: 150px; border-radius: 50%; margin: 6px auto 10px; display: grid; place-items: center;
  background: conic-gradient(var(--green) calc(var(--p) * 1%), var(--bg-soft) 0); position: relative; }
.ready-ring::before { content: ""; position: absolute; inset: 14px; border-radius: 50%; background: var(--card); }
.ready-num { position: relative; font-size: 38px; font-weight: 800; }
.ready-num small { font-size: 16px; font-weight: 600; color: var(--muted); }
.ready-tier { text-align: center; font-weight: 700; color: var(--green); }
.rd-list { display: flex; flex-direction: column; gap: 4px; }
.rd-item { display: flex; align-items: center; gap: 12px; padding: 10px 8px; border-radius: 10px; cursor: pointer; font-size: 14px; transition: .12s; }
.rd-item:hover { background: var(--bg-soft); }
.rd-item .rd-check { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--line); flex: none; display: grid; place-items: center; font-size: 12px; }
.rd-item.done .rd-check { background: var(--green); border-color: var(--green); color: #fff; }
.rd-item .rd-label { flex: 1; min-width: 120px; }
.rd-item .rd-weight { font-size: 12px; }

/* ---------- Career toolkit: portfolio + resume ---------- */
.port-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-top: 6px; }
.port-card { border: 1px solid var(--line); border-radius: 12px; padding: 16px; background: var(--card-2); }
.port-card.done { border-color: color-mix(in srgb, var(--green) 45%, var(--line)); }
.port-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 6px; }
.port-card p { font-size: 13px; margin: 0 0 12px; }
.resume-form { display: grid; gap: 12px; margin-bottom: 8px; }
.resume-form label { display: flex; flex-direction: column; gap: 5px; font-size: 12px; font-weight: 600; color: var(--muted); }
.resume { background: #fff; color: #1c2333; border-radius: 12px; box-shadow: var(--shadow); padding: 8px; }
[data-theme="dark"] .resume { background: #f7f8fc; }
.resume-inner { border: 1px solid #e6e9f2; border-radius: 8px; padding: 30px 34px; }
.resume-inner h2 { margin: 0; font-size: 28px; color: #1c2333; }
.resume-inner .r-head { color: #4f46e5; font-weight: 600; margin: 2px 0 12px; }
.resume-inner .r-sum { font-size: 14px; color: #4a536b; }
.resume-inner h4 { margin: 18px 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: #7c869c; border-bottom: 1px solid #e6e9f2; padding-bottom: 4px; }
.resume-inner .r-skills { display: flex; flex-wrap: wrap; gap: 7px; }
.resume-inner .r-skills span { background: #eef1fb; color: #4f46e5; padding: 4px 11px; border-radius: 999px; font-size: 12.5px; font-weight: 600; }
.resume-inner .r-proj { font-size: 13.5px; color: #4a536b; margin: 6px 0; }
.resume-inner .r-proj b { color: #1c2333; }
@media print {
  body.printing-resume * { visibility: hidden !important; }
  body.printing-resume #resumeDoc, body.printing-resume #resumeDoc * { visibility: visible !important; }
  body.printing-resume #resumeDoc { position: absolute; left: 0; top: 0; width: 100%; }
  body.printing-resume .resume { box-shadow: none; }
}

/* ---------- Progressive hints ---------- */
.hint-panel { padding: 4px 14px 10px; }
.hint-item { background: color-mix(in srgb, var(--amber) 10%, transparent); border: 1px solid color-mix(in srgb, var(--amber) 30%, transparent); border-radius: 9px; padding: 9px 13px; margin-top: 8px; font-size: 13.5px; color: var(--warn-ink); }
.hint-item code { background: var(--code-bg); padding: 1px 5px; border-radius: 5px; }

/* ---------- Polish: reading bar, hero motion, copy, confetti, onboarding ---------- */
#readbar { position: fixed; top: 0; left: 0; height: 3px; width: 0; z-index: 60; background: linear-gradient(90deg, var(--indigo), var(--violet), var(--teal)); box-shadow: 0 0 8px rgba(99, 102, 241, .5); transition: width .08s linear; }

.hero::before { animation: heroFloat 16s ease-in-out infinite alternate; }
@keyframes heroFloat { from { transform: translate3d(0, 0, 0) scale(1); } to { transform: translate3d(0, 20px, 0) scale(1.07); } }
.hero .pill { animation: fade .5s ease both; }
.hero h1 { animation: fade .5s .05s ease both; }
.hero .lead { animation: fade .5s .12s ease both; }
.hero .cta { animation: fade .5s .18s ease both; }
.hero .stats { animation: fade .5s .24s ease both; }

.confetti-canvas { position: fixed; inset: 0; pointer-events: none; z-index: 250; }

/* copy buttons on code examples */
.ex-head .ex-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ex-head .lang { margin-left: 0; }
.copy-btn { background: transparent; border: 1px solid var(--line); color: var(--muted); font-size: 11px; padding: 3px 9px; border-radius: 7px; cursor: pointer; font-family: inherit; transition: .15s; white-space: nowrap; }
.copy-btn:hover { color: var(--ink); border-color: var(--muted); }
.copy-btn.copied { color: var(--ok-ink); border-color: var(--green); }

/* onboarding modal */
.palette-overlay.onboard { align-items: center; padding-top: 0; }
.onboard-card { width: min(440px, 92vw); background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 34px 30px; text-align: center; box-shadow: var(--shadow-lg); animation: pop .25s ease; }
@keyframes pop { from { transform: scale(.94); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.onboard-emoji { font-size: 44px; }
.onboard-card h2 { margin: 8px 0 8px; font-size: 23px; }
.onboard-card p { margin: 0 0 18px; }
.onboard-actions { display: flex; gap: 10px; justify-content: center; margin-top: 4px; }

/* micro-interactions + a11y focus */
.track .ico { transition: transform .2s; }
.track:hover .ico { transform: scale(1.08) rotate(-3deg); }
a:focus-visible, .btn:focus-visible, .icon-btn:focus-visible, select:focus-visible, .mark-btn:focus-visible, .copy-btn:focus-visible { outline: 2px solid var(--indigo); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { *, .hero::before { animation: none !important; transition: none !important; } }

/* scrollbar polish */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 8px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }