/* ===== Python Pro — Exact Claude theme (Anthropic palette) ===== */
:root {
  --bg: #faf9f5;
  --bg-card: #ffffff;
  --ink: #191817;
  --ink-soft: #6b665d;
  --brand: #c15f3c;
  --brand-2: #d97757;
  --green: #4a7c59;
  --green-deep: #3c6b4a;
  --yellow: #d4a574;
  --red: #b23a1f;
  --blue: #6c8ab5;
  --code-bg: #2b2926;
  --code-ink: #faf9f5;
  --shadow: 0 8px 24px rgba(25, 24, 23, 0.06);
  --shadow-sm: 0 2px 8px rgba(25, 24, 23, 0.05);
  --radius: 14px;
  --radius-sm: 10px;
  --maxw: 920px;
}

[data-theme="dark"] {
  --bg: #262624;
  --bg-card: #30302e;
  --ink: #f4f3ee;
  --ink-soft: #b8b1a6;
  --brand: #e08a68;
  --brand-2: #d97757;
  --green: #6ba17d;
  --green-deep: #5c9070;
  --yellow: #e0b788;
  --red: #d16758;
  --blue: #8ba8cf;
  --code-bg: #1a1918;
  --code-ink: #f4f3ee;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);

  /* Override hardcoded light backgrounds that don't read from variables. */
  --soft-violet: #3a3230;
  --soft-green: #2a3a30;
  --soft-yellow: #3a3428;
}

body {
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  letter-spacing: -0.005em;
}
h1, h2, h3, .brand-name, .hero h1 {
  font-family: "Instrument Serif", "Copernicus", "Charter", Georgia, serif;
  font-weight: 400;
  letter-spacing: -0.01em;
}
code, pre, .code-area, .flash-content {
  font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

[data-theme="dark"] .topbar { background: rgba(22, 19, 37, 0.85); border-bottom-color: rgba(140, 125, 255, 0.18); }
[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 12% 18%, rgba(255, 126, 182, 0.08), transparent 40%),
    radial-gradient(circle at 88% 8%, rgba(84, 160, 255, 0.08), transparent 40%),
    radial-gradient(circle at 70% 90%, rgba(29, 209, 161, 0.08), transparent 45%);
}
[data-theme="dark"] .quiz-opt { background: var(--soft-violet); }
[data-theme="dark"] .quiz-opt.chosen,
[data-theme="dark"] .sb-lesson.active,
[data-theme="dark"] .sb-mod-head:hover,
[data-theme="dark"] .mod-day:hover,
[data-theme="dark"] .exam-day:hover { background: var(--soft-violet); }
[data-theme="dark"] .sb-lesson:hover { background: var(--soft-violet); }
[data-theme="dark"] .goal-box { background: var(--soft-green); border-color: #2a5d4c; }
[data-theme="dark"] .quiz-opt.correct,
[data-theme="dark"] .feedback.pass,
[data-theme="dark"] .test-result.pass,
[data-theme="dark"] .mod-day.st-done,
[data-theme="dark"] .exam-day.done { background: var(--soft-green); border-color: #2a5d4c; }
[data-theme="dark"] .tip { background: var(--soft-yellow); border-color: #5a4d20; }
[data-theme="dark"] .test-result.fail { background: var(--soft-yellow); border-color: #5a4d20; }
[data-theme="dark"] .mod-day,
[data-theme="dark"] .exam-day,
[data-theme="dark"] .sb-mod-head { background: var(--soft-violet); color: var(--ink); }
[data-theme="dark"] .progress-bar,
[data-theme="dark"] code.inline,
[data-theme="dark"] .pill { background: var(--soft-violet); }
[data-theme="dark"] .feedback.fail,
[data-theme="dark"] .quiz-opt.wrong,
[data-theme="dark"] .warn { background: #3a2126; border-color: #5a2a30; }
[data-theme="dark"] .mod-ring { background: conic-gradient(var(--brand) 0, var(--soft-violet) 0); box-shadow: inset 0 0 0 4px var(--bg-card); }
[data-theme="dark"] .mod-summary { color: var(--ink-soft); }
[data-theme="dark"] .sb-search,
[data-theme="dark"] .sb-extra { border-color: #34304f; }
[data-theme="dark"] .toast { background: var(--bg-card); }
[data-theme="dark"] .sb-mod-pct { background: var(--bg); }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Nunito", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  transition: background-color .3s, color .3s;
}

body {
  background-image:
    radial-gradient(circle at 12% 18%, rgba(255, 126, 182, 0.10), transparent 40%),
    radial-gradient(circle at 88% 8%, rgba(84, 160, 255, 0.10), transparent 40%),
    radial-gradient(circle at 70% 90%, rgba(29, 209, 161, 0.10), transparent 45%);
  background-attachment: fixed;
}

h1, h2, h3, .brand-name { font-family: "Fredoka", sans-serif; font-weight: 600; line-height: 1.2; }

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }

/* ===== Top bar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  background: rgba(255, 247, 239, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid rgba(108, 92, 231, 0.10);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-logo { font-size: 28px; }
.brand-name { font-size: 22px; color: var(--brand); }
.topnav { display: flex; align-items: center; gap: 8px; }
.nav-link {
  font-family: "Nunito", sans-serif;
  font-weight: 700;
  font-size: 15px;
  color: var(--ink-soft);
  padding: 8px 14px;
  border-radius: 999px;
  border: none;
  background: transparent;
  cursor: pointer;
}
.nav-link:hover { background: rgba(108, 92, 231, 0.10); color: var(--brand); text-decoration: none; }
.nav-link.ghost { color: var(--ink-soft); }
.streak {
  font-weight: 800;
  background: var(--yellow);
  color: #7a5b00;
  padding: 8px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

/* ===== Layout ===== */
.app { max-width: var(--maxw); margin: 0 auto; padding: 28px 20px 60px; }
.footer { text-align: center; color: var(--ink-soft); font-size: 14px; padding: 30px 20px 50px; }

/* ===== Hero (home) ===== */
.hero {
  text-align: center;
  padding: 24px 16px 8px;
}
.hero h1 { font-size: clamp(32px, 6vw, 52px); margin: 0 0 8px; }
.hero .accent { color: var(--brand); }
.hero p { color: var(--ink-soft); font-size: 19px; max-width: 620px; margin: 0 auto 18px; }
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  font-weight: 800;
  font-size: 18px;
  padding: 14px 28px;
  border-radius: 999px;
  box-shadow: var(--shadow);
  border: none;
  cursor: pointer;
}
.hero-cta:hover { transform: translateY(-2px); text-decoration: none; }

.progress-wrap { max-width: 520px; margin: 22px auto 6px; }
.progress-bar { height: 16px; background: #efe9ff; border-radius: 999px; overflow: hidden; box-shadow: inset 0 2px 4px rgba(0,0,0,.06); }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--green), var(--green-deep)); width: 0%; transition: width .4s ease; }
.progress-label { font-size: 14px; color: var(--ink-soft); margin-top: 8px; font-weight: 700; }

/* ===== Day grid ===== */
.section-title { font-size: 26px; margin: 36px 0 14px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 16px; }
.day-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
  color: var(--ink);
}
.day-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(108,92,231,.25); text-decoration: none; }
.day-card .day-emoji { font-size: 34px; }
.day-card .day-num { font-size: 13px; font-weight: 800; color: var(--brand); text-transform: uppercase; letter-spacing: .5px; }
.day-card .day-title { font-family: "Fredoka", sans-serif; font-size: 19px; }
.day-card .day-meta { font-size: 13px; color: var(--ink-soft); font-weight: 700; }
.day-card.done { border-color: var(--green); }
.day-card.done::after { content: "✓"; position: absolute; top: 14px; right: 16px; width: 26px; height: 26px; background: var(--green); color: #fff; border-radius: 50%; display: grid; place-items: center; font-weight: 900; }
.day-card.locked { opacity: .55; cursor: not-allowed; }
.day-card.locked::after { content: "🔒"; position: absolute; top: 14px; right: 14px; font-size: 18px; }
.day-card.locked:hover { transform: none; box-shadow: var(--shadow-sm); border-color: transparent; }

/* ===== Lesson view ===== */
.lesson-head { margin-bottom: 8px; }
.crumbs { font-size: 14px; font-weight: 700; color: var(--ink-soft); margin-bottom: 10px; }
.lesson-head h1 { font-size: clamp(28px, 5vw, 40px); margin: 6px 0; }
.lesson-head .subtitle { color: var(--ink-soft); font-size: 19px; }
.goal-box {
  display: flex; gap: 12px; align-items: flex-start;
  background: #eefcf6; border: 2px solid #c8f3e4; border-radius: var(--radius-sm);
  padding: 14px 16px; margin: 18px 0;
}
.goal-box .goal-emoji { font-size: 22px; }
.lesson-meta { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; font-weight: 700; color: var(--ink-soft); }
.pill { background: #efe9ff; color: var(--brand); padding: 4px 12px; border-radius: 999px; }

.block { margin: 22px 0; }
.block h2 { font-size: 24px; margin: 0 0 8px; }
.block p { margin: 8px 0; }
.block ul, .block ol { margin: 8px 0; padding-left: 22px; }
.block code.inline { background: #efe9ff; color: var(--brand); padding: 2px 7px; border-radius: 6px; font-family: "JetBrains Mono", monospace; font-size: .9em; }

.tip {
  display: flex; gap: 12px; align-items: flex-start;
  background: #fff8e6; border: 2px solid #ffe9ad; border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.tip .tip-emoji { font-size: 22px; }
.warn { background: #ffeef0; border-color: #ffd0d6; }

/* ===== Code blocks & runner ===== */
.code-card { background: var(--code-bg); border-radius: var(--radius-sm); overflow: hidden; box-shadow: var(--shadow-sm); }
.code-card .code-caption { font-size: 13px; font-weight: 700; color: #c9c1f0; padding: 10px 14px 0; }
.code-area {
  width: 100%; border: 2px solid transparent; resize: vertical; min-height: 64px;
  background: transparent; color: var(--code-ink);
  font-family: "JetBrains Mono", monospace; font-size: 15px; line-height: 1.55;
  padding: 12px 14px; tab-size: 4;
}
.code-area:focus { outline: none; border-color: var(--brand-2); }
pre.code-static { margin: 0; padding: 12px 14px; color: var(--code-ink); font-family: "JetBrains Mono", monospace; font-size: 15px; line-height: 1.55; overflow-x: auto; white-space: pre; }
.code-toolbar { display: flex; gap: 8px; align-items: center; padding: 8px 12px; background: rgba(255,255,255,.05); flex-wrap: wrap; }
.btn {
  font-family: "Nunito", sans-serif; font-weight: 800; font-size: 14px;
  border: none; border-radius: 999px; padding: 8px 16px; cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-run { background: #0a8f6f; color: #fff; }
.btn-run:hover { background: #097e62; }
.btn-check { background: #2f6f9e; color: #fff; }
.btn-check:hover { background: #285f87; }
.btn-soft { background: rgba(255,255,255,.14); color: #efeaff; }
.btn-soft:hover { background: rgba(255,255,255,.24); }
.btn:disabled { opacity: .6; cursor: wait; }
.run-out {
  font-family: "JetBrains Mono", monospace; font-size: 14px; white-space: pre-wrap;
  padding: 0 14px; max-height: 320px; overflow: auto; color: #d7ffe9;
}
.run-out.show { padding: 12px 14px; border-top: 1px solid rgba(255,255,255,.10); }
.run-out .err { color: #ffb3b3; }
.run-out .ok-tag { color: var(--green); font-weight: 700; }
.explain { font-size: 15px; color: var(--ink-soft); margin-top: 10px; }

/* ===== Try-it & challenge ===== */
.tryit, .challenge {
  background: var(--bg-card); border-radius: var(--radius); padding: 18px;
  box-shadow: var(--shadow-sm); border: 2px dashed rgba(108,92,231,.30);
}
.challenge { border-style: solid; border-color: var(--brand-2); }
.tryit h3, .challenge h3 { margin: 0 0 6px; font-size: 21px; display: flex; align-items: center; gap: 8px; }
.tryit .instructions, .challenge .instructions { color: var(--ink-soft); margin-bottom: 12px; }
.feedback { margin-top: 10px; font-weight: 800; padding: 10px 14px; border-radius: var(--radius-sm); display: none; }
.feedback.show { display: block; }
.feedback.pass { background: #eefcf6; color: var(--green-deep); border: 2px solid #c8f3e4; }
.feedback.fail { background: #ffeef0; color: #d63447; border: 2px solid #ffd0d6; }

/* ===== Quiz ===== */
.quiz { background: var(--bg-card); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-sm); }
.quiz h3 { margin: 0 0 12px; font-size: 20px; }
.quiz-opts { display: flex; flex-direction: column; gap: 10px; }
.quiz-opt {
  text-align: left; background: #f7f4ff; border: 2px solid transparent; border-radius: var(--radius-sm);
  padding: 12px 16px; font-size: 16px; font-weight: 700; cursor: pointer; font-family: "Nunito", sans-serif; color: var(--ink);
}
.quiz-opt:hover { border-color: rgba(108,92,231,.4); }
.quiz-opt.correct { background: #eefcf6; border-color: var(--green); }
.quiz-opt.wrong { background: #ffeef0; border-color: var(--red); }
.quiz-explain { margin-top: 12px; color: var(--ink-soft); font-size: 15px; display: none; }
.quiz-explain.show { display: block; }

/* ===== Lesson footer nav ===== */
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 40px; flex-wrap: wrap; }
.complete-btn {
  background: linear-gradient(135deg, var(--green), var(--green-deep));
  color: #fff; font-weight: 800; font-size: 18px; border: none; border-radius: 999px;
  padding: 14px 30px; cursor: pointer; box-shadow: var(--shadow); flex: 1; min-width: 220px;
}
.complete-btn:hover { transform: translateY(-2px); }
.complete-btn.done { background: var(--green); }
.navbtn { background: var(--bg-card); color: var(--ink); font-weight: 800; border: 2px solid rgba(108,92,231,.2); border-radius: 999px; padding: 14px 22px; cursor: pointer; box-shadow: var(--shadow-sm); }
.navbtn:hover { border-color: var(--brand); }
.navbtn:disabled { opacity: .4; cursor: not-allowed; }

/* ===== Toast / badge popup ===== */
.toast {
  position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%) translateY(120px);
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 16px 22px; display: flex; align-items: center; gap: 14px; z-index: 100;
  transition: transform .4s cubic-bezier(.2,1.2,.3,1); border: 2px solid var(--yellow); max-width: 90vw;
}
.toast.show { transform: translateX(-50%) translateY(0); }
.toast .toast-emoji { font-size: 34px; }
.toast .toast-title { font-family: "Fredoka", sans-serif; font-size: 18px; }
.toast .toast-sub { font-size: 14px; color: var(--ink-soft); }

/* ===== Loading ===== */
.py-status { font-size: 13px; color: #c9c1f0; font-weight: 700; }
.spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid rgba(255,255,255,.3); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.center-msg { text-align: center; color: var(--ink-soft); padding: 60px 20px; font-size: 18px; }

/* ===== Topbar additions ===== */
.topbar-left { display: flex; align-items: center; gap: 10px; }
.icon-btn {
  font-size: 20px; line-height: 1; background: rgba(108,92,231,.10); color: var(--brand);
  border: none; border-radius: 12px; width: 40px; height: 40px; cursor: pointer; font-weight: 800;
}
.icon-btn:hover { background: rgba(108,92,231,.20); }
.lead { color: var(--ink-soft); font-size: 18px; max-width: 720px; }

/* ===== Sidebar drawer ===== */
.backdrop { position: fixed; inset: 0; background: rgba(43,36,64,.45); z-index: 60; opacity: 0; pointer-events: none; transition: opacity .25s; }
.backdrop.show { opacity: 1; pointer-events: auto; }
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0; width: 340px; max-width: 88vw; z-index: 70;
  background: var(--bg-card); box-shadow: 6px 0 30px rgba(43,36,64,.25);
  transform: translateX(-105%); transition: transform .28s cubic-bezier(.3,1,.4,1);
  overflow-y: auto; padding: 18px 14px 40px;
}
.sidebar.open { transform: translateX(0); }
.sb-inner { display: flex; flex-direction: column; gap: 12px; }
.sb-title { font-family: "Fredoka", sans-serif; font-size: 20px; color: var(--brand); }
.sb-search { border: 2px solid #e8e2ff; border-radius: 12px; padding: 9px 12px; font-size: 14px; font-family: "Nunito", sans-serif; }
.sb-search:focus { outline: none; border-color: var(--brand); }
.sb-modules { display: flex; flex-direction: column; gap: 6px; }
.sb-mod-head {
  width: 100%; text-align: left; background: #f7f4ff; border: none; border-radius: 12px;
  padding: 11px 12px; cursor: pointer; display: flex; align-items: center; gap: 8px;
  font-family: "Nunito", sans-serif; font-weight: 800; font-size: 14px; color: var(--ink);
}
.sb-mod-head:hover { background: #efe9ff; }
.sb-caret { transition: transform .2s; color: var(--brand); }
.sb-mod-head.open .sb-caret { transform: rotate(90deg); }
.sb-mod-title { flex: 1; }
.sb-mod-pct { font-size: 12px; color: var(--brand); background: #fff; padding: 2px 8px; border-radius: 999px; }
.sb-mod-body { display: none; flex-direction: column; gap: 2px; padding: 4px 0 6px 8px; }
.sb-mod-body.open { display: flex; }
.sb-lesson {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 10px;
  font-size: 13.5px; font-weight: 700; color: var(--ink); text-decoration: none;
}
.sb-lesson:hover { background: #f3efff; text-decoration: none; }
.sb-lesson.active { background: #efe9ff; outline: 2px solid var(--brand); }
.sb-ic { width: 18px; text-align: center; }
.sb-ltext { flex: 1; }
.sb-lesson.st-done .sb-ic { color: var(--green-deep); }
.sb-lesson.st-current .sb-ic { color: var(--brand); }
.sb-lesson.st-locked { opacity: .5; cursor: not-allowed; }
.sb-test { color: var(--brand); font-weight: 800; }
.sb-extra { border-top: 2px solid #f0ecff; padding-top: 8px; display: flex; flex-direction: column; gap: 2px; }

/* ===== Modules overview ===== */
.mod-card { background: var(--bg-card); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 20px; margin: 16px 0; }
.mod-card-head { display: flex; justify-content: space-between; align-items: center; gap: 14px; }
.mod-card-head h2 { font-size: 22px; margin: 2px 0 0; }
.mod-kicker { font-size: 12px; font-weight: 800; color: var(--brand); text-transform: uppercase; letter-spacing: .5px; }
.mod-ring {
  flex-shrink: 0; width: 56px; height: 56px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 800; color: var(--brand); background: conic-gradient(var(--brand) 0, #efe9ff 0);
  font-size: 14px; box-shadow: inset 0 0 0 4px #fff;
}
.mod-summary { color: var(--ink-soft); margin: 10px 0 14px; }
.mod-days { display: flex; flex-direction: column; gap: 4px; margin-bottom: 14px; }
.mod-day { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: 10px; background: #f7f4ff; color: var(--ink); font-weight: 700; font-size: 15px; text-decoration: none; }
.mod-day:hover { background: #efe9ff; text-decoration: none; }
.mod-day.st-locked { opacity: .5; }
.mod-day.st-done { background: #eefcf6; }
.mod-test-btn { display: inline-block; background: var(--blue); color: #fff; font-weight: 800; padding: 10px 18px; border-radius: 999px; text-decoration: none; }
.mod-test-btn:hover { filter: brightness(1.05); text-decoration: none; }

/* ===== Module test ===== */
.test-view h1, .exam-view h1, .modules-view h1 { font-size: clamp(26px,5vw,36px); margin: 8px 0; }
.q-src { font-size: 13px; color: var(--ink-soft); font-weight: 700; }
.quiz-opt.chosen { border-color: var(--brand); background: #efe9ff; }
.test-result { margin: 16px 0 40px; padding: 16px 18px; border-radius: var(--radius-sm); font-size: 18px; display: none; }
.test-result.show { display: block; }
.test-result.pass { background: #eefcf6; border: 2px solid #c8f3e4; color: var(--green-deep); }
.test-result.fail { background: #fff8e6; border: 2px solid #ffe9ad; color: #9a6b00; }

/* ===== Exam page ===== */
.exam-facts { display: flex; gap: 10px; flex-wrap: wrap; margin: 10px 0 6px; }
.exam-block { background: var(--bg-card); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 18px; margin: 14px 0; border-left: 6px solid var(--brand); }
.exam-block-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.exam-block-head h2 { font-size: 20px; margin: 0; }
.exam-weight { font-weight: 800; color: var(--brand); white-space: nowrap; }
.exam-topics { color: var(--ink-soft); font-size: 15px; }
.exam-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.exam-day { background: #f7f4ff; color: var(--ink); font-weight: 700; font-size: 14px; padding: 7px 12px; border-radius: 999px; text-decoration: none; }
.exam-day:hover { background: #efe9ff; text-decoration: none; }
.exam-day.done { background: #eefcf6; color: var(--green-deep); }

/* ===== Surprise quiz banner ===== */
.surprise-quiz {
  background: var(--bg-card);
  border: 3px solid transparent;
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  background-image:
    linear-gradient(var(--bg-card), var(--bg-card)),
    linear-gradient(135deg, var(--brand), var(--yellow), var(--brand-2));
  background-origin: border-box;
  background-clip: padding-box, border-box;
}
.surprise-quiz h3 {
  font-family: "Fredoka", sans-serif;
  font-size: 22px;
  margin: 0 0 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.surprise-intro { color: var(--ink-soft); margin: 0 0 16px; }
.surprise-quiz .quiz { box-shadow: none; padding: 0; background: transparent; }
.surprise-quiz .quiz + .quiz { margin-top: 18px; padding-top: 18px; border-top: 2px solid rgba(108,92,231,.15); }
[data-theme="dark"] .surprise-quiz .quiz + .quiz { border-top-color: rgba(140,125,255,.22); }

@media (max-width: 700px) {
  .topnav .nav-link { padding: 8px 10px; font-size: 14px; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .brand-name { display: none; }
  .lesson-nav { flex-direction: column-reverse; }
  .topbar { flex-wrap: wrap; }
  .nav-secondary { display: none; }
}

/* ============================================================
   ===== Portfolio-grade polish layer (motion + finish) ======
   ============================================================ */
:root {
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-spring: cubic-bezier(.34, 1.56, .64, 1);
  --dur-fast: .16s;
  --dur: .28s;
  --dur-slow: .55s;
  --brand-rgb: 108, 92, 231;
  --brand2-rgb: 255, 126, 182;
  --ring-track: rgba(108, 92, 231, .14);
}
[data-theme="dark"] {
  --brand-rgb: 140, 125, 255;
  --ring-track: rgba(140, 125, 255, .22);
}

/* ----- Entrance animations ----- */
@keyframes view-rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes card-rise { from { opacity: 0; transform: translateY(22px) scale(.97); } to { opacity: 1; transform: none; } }
@keyframes float-drift { 0%, 100% { transform: translateY(0) rotate(0); } 50% { transform: translateY(-14px) rotate(4deg); } }
@keyframes hue-pan { to { background-position: 200% center; } }
@keyframes pop-in { 0% { transform: scale(0); } 70% { transform: scale(1.25); } 100% { transform: scale(1); } }

.view-enter { animation: view-rise var(--dur-slow) var(--ease-out) both; }
.card-enter { animation: card-rise .5s var(--ease-out) both; animation-delay: calc(var(--i, 0) * 55ms); }

/* ----- Hero: animated gradient headline + aurora + floating accents ----- */
.hero { position: relative; overflow: visible; }
.hero h1 .accent {
  background: linear-gradient(110deg, var(--brand), var(--brand-2), var(--brand));
  background-size: 220% auto;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  animation: hue-pan 6s linear infinite;
}
.hero::before {
  content: ""; position: absolute; inset: -40px 0 auto; height: 260px; z-index: -1;
  background:
    radial-gradient(420px 200px at 30% 20%, rgba(var(--brand-rgb), .22), transparent 70%),
    radial-gradient(380px 200px at 72% 10%, rgba(var(--brand2-rgb), .20), transparent 70%);
  filter: blur(8px); pointer-events: none;
  animation: float-drift 9s var(--ease-out) infinite;
}
.hero-cta {
  transition: transform var(--dur) var(--ease-spring), box-shadow var(--dur) var(--ease-out), filter var(--dur);
  position: relative;
}
.hero-cta:hover { transform: translateY(-3px) scale(1.03); box-shadow: 0 16px 38px rgba(var(--brand-rgb), .42); filter: saturate(1.08); }
.hero-cta:active { transform: translateY(-1px) scale(.99); }

/* ----- Animated progress bar fill (sheen) ----- */
.progress-fill { position: relative; overflow: hidden; }
.progress-fill::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, transparent 20%, rgba(255,255,255,.45) 50%, transparent 80%);
  transform: translateX(-100%); animation: sheen 2.4s var(--ease-out) infinite;
}
@keyframes sheen { to { transform: translateX(100%); } }

/* ----- Day cards: tactile hover + progress accent ----- */
.day-card {
  transition: transform var(--dur) var(--ease-spring), box-shadow var(--dur) var(--ease-out), border-color var(--dur);
  will-change: transform;
}
.day-card::before {
  content: ""; position: absolute; left: 0; top: 0; height: 100%; width: 4px;
  background: linear-gradient(var(--brand), var(--brand-2)); border-radius: 4px 0 0 4px;
  opacity: 0; transition: opacity var(--dur);
}
.day-card:hover { transform: translateY(-6px) scale(1.02); box-shadow: 0 22px 44px rgba(var(--brand-rgb), .28); border-color: rgba(var(--brand-rgb), .35); }
.day-card:hover::before { opacity: 1; }
.day-card:active { transform: translateY(-2px) scale(.99); }
.day-card .day-emoji { transition: transform var(--dur) var(--ease-spring); display: inline-block; }
.day-card:hover .day-emoji { transform: scale(1.15) rotate(-6deg); }
.day-card.done::after { animation: pop-in .4s var(--ease-spring) both; }
.day-card.locked:hover { transform: none; box-shadow: var(--shadow-sm); }
.day-card.locked:hover::before { opacity: 0; }

/* ----- Buttons: press + focus feedback ----- */
.btn, .complete-btn, .navbtn, .mod-test-btn, .nav-link, .icon-btn {
  transition: transform var(--dur-fast) var(--ease-spring), background var(--dur), box-shadow var(--dur), border-color var(--dur), filter var(--dur);
}
.btn:active, .navbtn:active, .mod-test-btn:active { transform: scale(.95); }
.complete-btn { transition: transform var(--dur) var(--ease-spring), box-shadow var(--dur), filter var(--dur); }
.complete-btn:hover { box-shadow: 0 16px 36px rgba(29, 209, 161, .4); filter: saturate(1.06); }
.complete-btn:active { transform: translateY(0) scale(.98); }
.btn-run:active, .btn-check:active { transform: scale(.94); }

/* ----- Quiz option select feedback ----- */
.quiz-opt { transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur), background var(--dur), box-shadow var(--dur); }
.quiz-opt:hover { transform: translateX(3px); }
.quiz-opt.correct { animation: pop-in .35s var(--ease-spring); box-shadow: 0 6px 18px rgba(29, 209, 161, .25); }
.quiz-opt:active { transform: scale(.99); }

/* ----- Glass topbar ----- */
.topbar { backdrop-filter: blur(14px) saturate(1.4); transition: box-shadow var(--dur); }
.topbar:hover { box-shadow: 0 6px 22px rgba(var(--brand-rgb), .12); }

/* ----- Toast entrance refinement ----- */
.toast .toast-emoji { display: inline-block; animation: pop-in .5s var(--ease-spring) both; animation-delay: .12s; }

/* ----- Code card chrome (traffic-light dots) ----- */
.code-card { position: relative; border: 1px solid rgba(255,255,255,.06); }
.code-card .code-toolbar::before {
  content: "● ● ●"; letter-spacing: 2px; color: rgba(255,255,255,.22); font-size: 11px; margin-right: 4px;
}

/* ----- Lesson view entrance ----- */
.lesson-head { animation: view-rise var(--dur-slow) var(--ease-out) both; }
.block { animation: view-rise var(--dur) var(--ease-out) both; }

/* ----- Reduced motion: disable non-essential animation ----- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .hero h1 .accent { -webkit-text-fill-color: currentColor; color: var(--brand); background: none; }
  .day-card:hover { transform: translateY(-3px); }
}

/* ============================================================
   ===== AI Tutor Chat Panel (PyBuddy) =======================
   ============================================================ */

/* ---- Floating action button ---- */
.ai-fab {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 200;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  font-size: 28px;
  cursor: pointer;
  box-shadow: 0 8px 28px rgba(var(--brand-rgb), .45);
  display: grid;
  place-items: center;
  transition: transform var(--dur) var(--ease-spring), box-shadow var(--dur), opacity .2s;
}
.ai-fab:hover {
  transform: scale(1.1) translateY(-3px);
  box-shadow: 0 14px 36px rgba(var(--brand-rgb), .55);
}
.ai-fab:active { transform: scale(.95); }
.ai-fab.hidden { opacity: 0; pointer-events: none; transform: scale(.6); }
.ai-fab-icon { line-height: 1; }
.ai-fab-pulse {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 3px solid var(--brand);
  opacity: 0;
  animation: ai-pulse 2.5s ease-out infinite;
}
@keyframes ai-pulse {
  0% { transform: scale(1); opacity: .6; }
  100% { transform: scale(1.5); opacity: 0; }
}

/* ---- Chat panel ---- */
.ai-panel {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 210;
  width: 390px;
  max-width: calc(100vw - 32px);
  height: 540px;
  max-height: calc(100vh - 80px);
  background: var(--bg-card);
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .25), 0 0 0 1px rgba(var(--brand-rgb), .12);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px) scale(.92);
  opacity: 0;
  pointer-events: none;
  transition: transform .3s var(--ease-spring), opacity .2s;
}
.ai-panel.open {
  transform: translateY(0) scale(1);
  opacity: 1;
  pointer-events: auto;
}

/* ---- Header ---- */
.ai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  flex-shrink: 0;
}
.ai-header-left { display: flex; align-items: center; gap: 10px; }
.ai-avatar { font-size: 30px; }
.ai-name { font-family: "Fredoka", sans-serif; font-size: 18px; font-weight: 700; }
.ai-subtitle { font-size: 12px; opacity: .85; }
.ai-close {
  background: rgba(255,255,255,.2);
  border: none;
  color: #fff;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-size: 22px;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background .15s;
}
.ai-close:hover { background: rgba(255,255,255,.35); }

/* ---- Messages area ---- */
.ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}

/* ---- Welcome screen ---- */
.ai-welcome {
  text-align: center;
  padding: 30px 10px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.ai-welcome-emoji { font-size: 48px; animation: float-drift 4s var(--ease-out) infinite; }
.ai-welcome-title { font-family: "Fredoka", sans-serif; font-size: 22px; color: var(--brand); }
.ai-welcome-sub { font-size: 14px; color: var(--ink-soft); max-width: 280px; }
.ai-quick-prompts { display: flex; flex-direction: column; gap: 8px; margin-top: 14px; width: 100%; }
.ai-quick {
  background: rgba(var(--brand-rgb), .08);
  border: 2px solid rgba(var(--brand-rgb), .15);
  border-radius: 12px;
  padding: 10px 14px;
  font-family: "Nunito", sans-serif;
  font-weight: 700;
  font-size: 14px;
  color: var(--brand);
  cursor: pointer;
  text-align: left;
  transition: background .15s, border-color .15s, transform .1s;
}
.ai-quick:hover {
  background: rgba(var(--brand-rgb), .14);
  border-color: var(--brand);
  transform: translateX(3px);
}

/* ---- Chat bubbles ---- */
.ai-bubble {
  display: flex;
  gap: 8px;
  max-width: 92%;
  animation: view-rise .25s var(--ease-out) both;
}
.ai-user {
  flex-direction: row-reverse;
  align-self: flex-end;
}
.ai-ai, .ai-error {
  align-self: flex-start;
}
.ai-bubble-avatar { font-size: 20px; flex-shrink: 0; margin-top: 4px; }
.ai-bubble-content {
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 14.5px;
  line-height: 1.55;
  word-break: break-word;
}
.ai-user .ai-bubble-content {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  border-bottom-right-radius: 4px;
}
.ai-ai .ai-bubble-content {
  background: rgba(var(--brand-rgb), .08);
  color: var(--ink);
  border-bottom-left-radius: 4px;
}
.ai-error .ai-bubble-content {
  background: #ffeef0;
  color: #d63447;
  border: 1px solid #ffd0d6;
}
[data-theme="dark"] .ai-error .ai-bubble-content {
  background: #3a2126;
  border-color: #5a2a30;
  color: #ffb3b3;
}

/* ---- Code in AI replies ---- */
pre.ai-code {
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 10px 12px;
  border-radius: 10px;
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  overflow-x: auto;
  margin: 8px 0;
  white-space: pre-wrap;
}
code.ai-inline {
  background: rgba(var(--brand-rgb), .12);
  color: var(--brand);
  padding: 2px 6px;
  border-radius: 5px;
  font-family: "JetBrains Mono", monospace;
  font-size: .88em;
}

/* ---- Thinking dots ---- */
.ai-thinking .ai-bubble-content { color: var(--ink-soft); font-style: italic; }
.ai-dots span {
  display: inline-block;
  animation: ai-dot-bounce .6s ease-in-out infinite;
  font-weight: 900;
  font-size: 18px;
}
.ai-dots span:nth-child(2) { animation-delay: .15s; }
.ai-dots span:nth-child(3) { animation-delay: .3s; }
@keyframes ai-dot-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

/* ---- Input area ---- */
.ai-input-wrap {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid rgba(var(--brand-rgb), .10);
  background: var(--bg-card);
  flex-shrink: 0;
}
.ai-input {
  flex: 1;
  border: 2px solid rgba(var(--brand-rgb), .18);
  border-radius: 14px;
  padding: 10px 14px;
  font-family: "Nunito", sans-serif;
  font-size: 14px;
  resize: none;
  min-height: 40px;
  max-height: 120px;
  background: var(--bg);
  color: var(--ink);
  transition: border-color .15s;
}
.ai-input:focus { outline: none; border-color: var(--brand); }
.ai-input::placeholder { color: var(--ink-soft); }
.ai-send {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  cursor: pointer;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: transform .1s, opacity .15s;
}
.ai-send:hover { transform: scale(1.08); }
.ai-send:active { transform: scale(.92); }
.ai-send:disabled { opacity: .5; cursor: not-allowed; }
.ai-error-text { font-size: 13px; }

/* ---- Mobile responsive ---- */
@media (max-width: 600px) {
  .ai-fab { bottom: 16px; right: 16px; width: 52px; height: 52px; font-size: 24px; }
  .ai-panel {
    bottom: 0;
    right: 0;
    width: 100vw;
    max-width: 100vw;
    height: 100vh;
    max-height: 100vh;
    border-radius: 0;
  }
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .ai-fab-pulse { animation: none; }
  .ai-dots span { animation: none; }
}

/* ===== Real-life examples + milestone assessments ===== */
.example-card,
.assessment-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  border: 2px solid rgba(var(--brand-rgb), .22);
}
.example-card { border-left: 7px solid var(--green); }
.assessment-card { border-left: 7px solid var(--brand); }
.example-card h3,
.assessment-card h3 { margin: 0 0 8px; font-size: 22px; }
.assessment-intro,
.assessment-note { color: var(--ink-soft); margin: 8px 0 14px; }
.assessment-form { display: flex; flex-direction: column; gap: 14px; margin: 14px 0; }
.assessment-question { box-shadow: none; border: 2px solid rgba(var(--brand-rgb), .12); }
.assessment-submit { margin-top: 6px; }
.assessment-result { margin-bottom: 0; }
[data-theme="dark"] .example-card,
[data-theme="dark"] .assessment-card,
[data-theme="dark"] .assessment-question { border-color: rgba(140, 125, 255, .25); }

/* ============================================================
   ===== Recap Games (milestone recap, coddy.tech style) =====
   ============================================================ */
.recapgame {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  border: 3px solid transparent;
  background-image:
    linear-gradient(var(--bg-card), var(--bg-card)),
    linear-gradient(135deg, var(--brand), var(--yellow), var(--green), var(--brand-2));
  background-origin: border-box;
  background-clip: padding-box, border-box;
}
.recapgame h3 {
  font-family: "Fredoka", sans-serif;
  font-size: 22px;
  margin: 0 0 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.recap-instructions { color: var(--ink-soft); margin: 0 0 16px; font-size: 15px; }

/* ---- Sorter game ---- */
.sorter-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 12px 0 18px;
}
.sorter-item {
  display: flex;
  align-items: stretch;
  gap: 10px;
  background: linear-gradient(135deg, rgba(var(--brand-rgb), .06), rgba(var(--brand2-rgb), .06));
  border: 2px solid rgba(var(--brand-rgb), .18);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: grab;
  transition: transform .18s var(--ease-out), box-shadow .18s, border-color .18s, background .18s;
}
.sorter-item:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
  box-shadow: 0 10px 22px rgba(var(--brand-rgb), .22);
}
.sorter-item.dragging { opacity: .55; cursor: grabbing; }
.sorter-item.drag-over {
  border-color: var(--brand-2);
  background: linear-gradient(135deg, rgba(var(--brand-rgb), .14), rgba(var(--brand2-rgb), .14));
  box-shadow: 0 0 0 3px rgba(var(--brand2-rgb), .30);
}
.sorter-code {
  flex: 1;
  margin: 0;
  padding: 10px 14px;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--radius-sm);
  font-family: "JetBrains Mono", monospace;
  font-size: 14.5px;
  overflow-x: auto;
  white-space: pre;
  line-height: 1.5;
}
.sorter-controls {
  display: flex;
  flex-direction: column;
  gap: 4px;
  justify-content: center;
}
.sorter-btn {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  border: none;
  border-radius: 10px;
  width: 36px;
  height: 26px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
  display: grid;
  place-items: center;
  transition: transform .12s var(--ease-spring), filter .15s, box-shadow .15s;
  box-shadow: 0 3px 8px rgba(var(--brand-rgb), .30);
}
.sorter-btn:hover:not(:disabled) {
  transform: scale(1.12);
  filter: brightness(1.1);
  box-shadow: 0 6px 14px rgba(var(--brand-rgb), .40);
}
.sorter-btn:active:not(:disabled) { transform: scale(.92); }
.sorter-btn:disabled { opacity: .30; cursor: not-allowed; box-shadow: none; }

.recap-toolbar {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}
.recap-toolbar .btn {
  font-size: 15px;
  padding: 10px 20px;
  box-shadow: 0 6px 16px rgba(47, 111, 158, .28);
}

/* ---- Match game ---- */
.match-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 12px 0 16px;
}
.match-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.match-card {
  background: linear-gradient(135deg, rgba(var(--brand-rgb), .08), rgba(var(--brand2-rgb), .08));
  border: 2px solid rgba(var(--brand-rgb), .20);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: "Nunito", sans-serif;
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  min-height: 56px;
  display: flex;
  align-items: center;
  word-break: break-word;
  transition: transform .15s var(--ease-spring), background .15s, border-color .15s, box-shadow .15s, color .15s;
}
.match-left {
  font-family: "JetBrains Mono", monospace;
  font-size: 14.5px;
}
.match-card:hover:not(:disabled) {
  transform: translateY(-3px) scale(1.02);
  border-color: var(--brand);
  box-shadow: 0 12px 26px rgba(var(--brand-rgb), .22);
}
.match-card:active:not(:disabled) { transform: scale(.98); }
.match-card.selected {
  border-color: var(--brand);
  background: linear-gradient(135deg, rgba(var(--brand-rgb), .22), rgba(var(--brand2-rgb), .22));
  box-shadow: 0 0 0 3px rgba(var(--brand-rgb), .28), 0 12px 26px rgba(var(--brand-rgb), .30);
  transform: translateY(-2px);
}
.match-card.correct {
  background: linear-gradient(135deg, rgba(29, 209, 161, .22), rgba(29, 209, 161, .10));
  border-color: var(--green);
  color: var(--green-deep);
  cursor: default;
  animation: pop-in .35s var(--ease-spring);
}
.match-card.correct::after { content: " ✅"; margin-left: auto; padding-left: 8px; }
.match-card.wrong {
  background: #ffeef0;
  border-color: var(--red);
  color: #d63447;
}
[data-theme="dark"] .match-card.wrong { background: #3a2126; border-color: #5a2a30; color: #ffb3b3; }

/* ---- Feedback card ---- */
.recap-feedback {
  display: none;
  text-align: center;
  padding: 18px 16px;
  border-radius: var(--radius-sm);
  margin-top: 10px;
}
.recap-feedback.show { display: block; animation: pop-in .5s var(--ease-spring) both; }
.recap-feedback.pass {
  background: linear-gradient(135deg, rgba(29, 209, 161, .14), rgba(254, 202, 87, .14));
  border: 2px solid var(--green);
  color: var(--green-deep);
}
.recap-feedback.fail {
  background: #ffeef0;
  border: 2px solid var(--red);
  color: #d63447;
}
[data-theme="dark"] .recap-feedback.fail { background: #3a2126; border-color: #5a2a30; color: #ffb3b3; }
.recap-feedback .recap-big { font-size: 52px; line-height: 1; margin-bottom: 6px; }
.recap-feedback .recap-msg { font-family: "Fredoka", sans-serif; font-size: 22px; font-weight: 700; }
.recap-feedback .recap-xp {
  display: inline-block;
  margin-top: 12px;
  background: linear-gradient(135deg, var(--yellow), var(--brand-2));
  color: #7a5b00;
  font-family: "Fredoka", sans-serif;
  font-weight: 800;
  font-size: 18px;
  padding: 8px 22px;
  border-radius: 999px;
  box-shadow: 0 8px 22px rgba(254, 202, 87, .50);
  animation: pop-in .5s var(--ease-spring) .1s both;
}

@keyframes recap-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}
.shake { animation: recap-shake .5s var(--ease-out); }

@media (max-width: 600px) {
  .match-grid { grid-template-columns: 1fr; gap: 8px; }
  .match-col { gap: 8px; }
  .sorter-code { font-size: 13px; padding: 8px 10px; }
}

/* ============================================================
   ===== Practice Problems (LeetCode + Codeforces) ============
   ============================================================ */
.practice-block { margin: 24px 0; padding: 20px; border-radius: 16px; background: linear-gradient(135deg, rgba(255, 200, 87, 0.08), rgba(10, 143, 111, 0.06)); border: 1px solid rgba(255, 200, 87, 0.25); }
.practice-block h3 { margin: 0 0 8px 0; font-size: 1.15rem; }
.practice-intro { color: #666; margin: 4px 0 16px 0; font-size: 0.95rem; }
.practice-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.practice-card { display: flex; flex-direction: column; padding: 14px; border-radius: 12px; background: #fff; text-decoration: none; color: inherit; border: 1px solid rgba(0,0,0,0.08); transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease; }
.practice-card:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08); border-color: var(--brand); }
.practice-plat { font-size: 0.8rem; font-weight: 700; color: #888; margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.05em; }
.practice-title { font-weight: 700; font-size: 1rem; margin-bottom: 10px; color: #222; }
.practice-meta { display: flex; justify-content: space-between; align-items: center; margin-top: auto; }
.practice-diff { padding: 3px 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 700; }
.practice-diff.diff-easy { background: rgba(0, 175, 91, 0.15); color: #007a3c; }
.practice-diff.diff-med { background: rgba(255, 170, 0, 0.18); color: #a06400; }
.practice-diff.diff-hard { background: rgba(255, 70, 70, 0.15); color: #b3001b; }
.practice-open { font-size: 0.8rem; color: var(--brand); font-weight: 700; }
.practice-tip { margin-top: 14px; padding: 10px 14px; background: rgba(255, 200, 87, 0.15); border-radius: 8px; font-size: 0.9rem; }

[data-theme="dark"] .practice-card { background: #1a1a2e; border-color: rgba(255,255,255,0.1); }
[data-theme="dark"] .practice-title { color: #f5f5f5; }
[data-theme="dark"] .practice-intro { color: #aaa; }

/* ============================================================
   ===== Flashcards (click-to-flip review) ===================
   ============================================================ */
.flashcards-block { margin: 24px 0; padding: 22px; border-radius: 18px; background: linear-gradient(135deg, rgba(120, 80, 220, 0.08), rgba(10, 143, 111, 0.05)); border: 1px solid rgba(120, 80, 220, 0.2); }
.flashcards-block h3 { margin: 0 0 6px 0; font-size: 1.15rem; }
.flash-intro { color: #666; margin: 4px 0 12px 0; font-size: 0.95rem; }
.flash-progress { display: inline-block; padding: 4px 12px; border-radius: 999px; background: rgba(120, 80, 220, 0.15); color: #6a37b8; font-weight: 700; font-size: 0.85rem; margin-bottom: 14px; }
.flash-progress.done { background: rgba(0, 175, 91, 0.18); color: #007a3c; }
.flashcards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.flashcard { perspective: 1000px; height: 150px; cursor: pointer; }
.flashcard-inner { position: relative; width: 100%; height: 100%; transition: transform 0.6s cubic-bezier(.5,.05,.3,1); transform-style: preserve-3d; }
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face { position: absolute; inset: 0; padding: 14px; border-radius: 14px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; backface-visibility: hidden; -webkit-backface-visibility: hidden; box-shadow: 0 6px 18px rgba(0,0,0,0.08); border: 1px solid rgba(0,0,0,0.06); }
.flashcard-front { background: linear-gradient(140deg, #ffffff, #f4f0ff); color: #333; }
.flashcard-back { background: linear-gradient(140deg, #7850dc, #a67dfe); color: #fff; transform: rotateY(180deg); }
.flash-label { position: absolute; top: 8px; left: 12px; font-size: 0.75rem; font-weight: 800; opacity: 0.65; letter-spacing: 0.1em; }
.flash-content { font-family: "JetBrains Mono", monospace; font-size: 1rem; font-weight: 600; line-height: 1.4; word-break: break-word; }
.flashcard-back .flash-content { font-family: "Nunito", "Fredoka", sans-serif; font-weight: 700; }
.flashcard:hover .flashcard-inner { transform: translateY(-3px); }
.flashcard.flipped:hover .flashcard-inner { transform: translateY(-3px) rotateY(180deg); }

[data-theme="dark"] .flashcard-front { background: linear-gradient(140deg, #1e1e30, #262040); color: #f5f5f5; border-color: rgba(255,255,255,0.1); }
[data-theme="dark"] .flash-intro { color: #aaa; }