:root{
  font-family:Inter,"Noto Sans TC",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:#172033;
  background:#f4f7fb;
  line-height:1.65;
  --ink:#172033;
  --muted:#60708a;
  --line:#dce4ef;
  --panel:#ffffff;
  --soft:#eef3f9;
  --accent:#315fcb;
  --accent-2:#7048d8;
  --dark:#111a2d;
  --radius:20px;
  --shadow:0 18px 55px rgba(31,51,86,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  background:
    radial-gradient(circle at 12% 0%,rgba(49,95,203,.09),transparent 26rem),
    radial-gradient(circle at 92% 12%,rgba(112,72,216,.08),transparent 24rem),
    #f4f7fb;
}
a{color:var(--accent)}
button,input,select,textarea{font:inherit}

.topbar{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:13px max(4vw,24px);
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(220,228,239,.9);
  box-shadow:0 6px 28px rgba(31,51,86,.04);
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-weight:900;letter-spacing:-.02em;color:var(--ink);text-decoration:none;
}
.brand::before{
  content:"</>";
  display:grid;place-items:center;
  width:36px;height:36px;border-radius:11px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;font-size:.78rem;letter-spacing:-.08em;
}
.topbar nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.topbar nav a{
  color:#526078;text-decoration:none;font-size:.93rem;font-weight:700;
  padding:8px 10px;border-radius:10px;
}
.topbar nav a:hover{background:var(--soft);color:var(--ink)}

.hero,.section{max-width:1160px;margin:auto;padding:68px 28px}
.hero{padding-top:92px;padding-bottom:84px}
.hero::before{
  content:"LEARN THE SYSTEM, NOT JUST THE SYNTAX";
  display:inline-flex;padding:6px 10px;border:1px solid #cbd8ef;border-radius:999px;
  background:rgba(255,255,255,.8);color:#50617d;font-size:.72rem;font-weight:900;letter-spacing:.09em;
}
.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-size:.75rem;font-weight:900;color:#62728b}
.hero h1{
  font-size:clamp(2.7rem,7vw,5.3rem);
  line-height:.98;letter-spacing:-.055em;max-width:980px;margin:.25em 0;
}
.lead{font-size:1.16rem;max-width:790px;color:var(--muted)}
.principles{display:flex;gap:10px;flex-wrap:wrap;margin-top:30px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.primary-cta,.secondary-cta{display:inline-block;padding:12px 17px;border-radius:12px;text-decoration:none;font-weight:900}
.primary-cta{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;box-shadow:0 12px 28px rgba(49,95,203,.22)}
.secondary-cta{background:#fff;color:var(--ink);border:1px solid var(--line)}
.continue-cta{display:inline-block;padding:12px 17px;border-radius:12px;text-decoration:none;font-weight:900;background:#eaf0fc;color:#294eaa;border:1px solid #c8d5ef}
.principles span,.rule,.analogy,.method{
  background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:14px;padding:12px 16px;
  box-shadow:0 8px 24px rgba(31,51,86,.04);
}

.section{position:relative}
.section+.section{border-top:1px solid rgba(220,228,239,.65)}
.section-heading{max-width:820px;margin-bottom:24px}
.section h2{font-size:clamp(1.9rem,4vw,3.2rem);line-height:1.08;letter-spacing:-.035em;margin:.3em 0}
.section h3{font-size:1.25rem;margin-top:34px}
.section p{color:#53637c}

.lesson-grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:26px;
}
.lesson-card{
  position:relative;display:block;min-height:205px;
  padding:22px;border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(160deg,#fff 0%,#f8faff 100%);
  color:var(--ink);text-decoration:none;
  box-shadow:0 10px 32px rgba(31,51,86,.05);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.lesson-card:hover{
  transform:translateY(-4px);
  border-color:#b9c8e3;box-shadow:var(--shadow);
}
.lesson-card>span{
  display:inline-block;padding:5px 9px;border-radius:999px;background:#eaf0fc;
  color:#315fcb;font-size:.72rem;font-weight:900;letter-spacing:.05em;text-transform:uppercase;
}
.lesson-card h3{margin:18px 0 8px;font-size:1.2rem}
.lesson-card p{font-size:.92rem;margin:0;color:#63728a}

.tool-hub{
  margin-top:18px;margin-bottom:18px;
  border:1px solid var(--line);border-radius:28px;
  background:rgba(255,255,255,.72);box-shadow:var(--shadow);
}
.clinic-hero{
  max-width:none;
  padding-left:max(calc((100vw - 1160px)/2 + 28px),28px);
  padding-right:max(calc((100vw - 1160px)/2 + 28px),28px);
  background:
    radial-gradient(circle at 80% 10%,rgba(112,72,216,.32),transparent 28rem),
    linear-gradient(135deg,#111a2d,#172541);
  color:#fff;border-top:0!important;
}
.clinic-hero h2{max-width:800px}
.clinic-hero .eyebrow,.clinic-hero p{color:#d6dfef}
.clinic-button{
  display:inline-block;background:#fff;color:#172033;text-decoration:none;font-weight:900;
  padding:12px 17px;border-radius:12px;box-shadow:0 10px 24px rgba(0,0,0,.16);
}

.course-links{
  display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:11px;margin:22px 0 30px;
}
.course-links a{
  display:flex;flex-direction:column;gap:8px;min-height:115px;
  padding:17px;background:linear-gradient(150deg,#172033,#24334d);color:#fff;text-decoration:none;
  border:1px solid rgba(255,255,255,.08);border-radius:16px;
  box-shadow:0 10px 28px rgba(17,26,45,.13);
  transition:transform .18s ease,box-shadow .18s ease;
}
.course-links a:hover{transform:translateY(-3px);box-shadow:0 16px 35px rgba(17,26,45,.19)}
.course-links b{font-size:1.35rem;line-height:1;color:#afc6ff}
.course-links span{font-size:.89rem;line-height:1.35;color:#f4f7ff}
.deep-links{grid-template-columns:repeat(4,minmax(0,1fr))}
.lab-callout{
  margin:18px 0 30px;padding:18px 20px;border:1px solid #cbd8ea;border-radius:16px;
  background:linear-gradient(135deg,#fff,#f5f8ff);
}

.roadmap{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px}
.module,article{
  background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;
  box-shadow:0 8px 24px rgba(31,51,86,.04);
}
.module b{display:block;margin-bottom:8px}
.module ul{padding-left:20px;color:#526078}

.flow{display:flex;align-items:center;gap:8px;overflow:auto;padding:20px 0}
.flow button,.error-card{
  border:1px solid #ccd5e3;background:#fff;border-radius:14px;padding:14px;cursor:pointer;font:inherit;
  box-shadow:0 6px 18px rgba(31,51,86,.04);transition:.18s ease;
}
.flow button:hover,.error-card:hover{transform:translateY(-2px);border-color:#aebed8}
.explain{
  min-height:90px;padding:20px;border-left:4px solid var(--accent);
  background:#edf3ff;border-radius:0 14px 14px 0;margin:10px 0 30px;
}
.grid{display:grid;gap:16px}.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.code-lab{display:grid;grid-template-columns:1.2fr 1fr;gap:18px}
pre{
  margin:0;background:#111a2d;color:#eef4ff;border:1px solid #25334e;border-radius:18px;
  padding:24px;overflow:auto;font-size:.96rem;box-shadow:0 12px 28px rgba(17,26,45,.12);
}
input{padding:8px;border:1px solid #becadd;border-radius:9px}
.debug-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.error-card{text-align:left}
.error-card b,.error-card span{display:block}
.error-card span{color:#66748c;font-size:.9rem}
article a{font-weight:800}
footer{text-align:center;padding:48px 24px;color:#66748c;border-top:1px solid var(--line)}

@media(max-width:980px){
  .lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .course-links{grid-template-columns:repeat(3,minmax(0,1fr))}
  .deep-links{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:700px){
  .topbar{padding:11px 16px}.topbar nav{display:none}
  .hero,.section{padding:48px 18px}.hero{padding-top:64px}
  .hero h1{font-size:clamp(2.5rem,13vw,4rem)}
  .two,.code-lab,.debug-grid,.lesson-grid{grid-template-columns:1fr}
  .course-links,.deep-links{grid-template-columns:repeat(2,minmax(0,1fr))}
  .course-links a{min-height:100px}
  .clinic-hero{padding-left:18px;padding-right:18px}
}
@media(max-width:430px){
  .course-links,.deep-links{grid-template-columns:1fr}
}

/* 2026-10 Learning cockpit refresh */
.cockpit-section{padding-top:34px}
.cockpit-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.cockpit-stat{padding:18px;border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.9);box-shadow:0 8px 26px rgba(31,51,86,.045)}
.cockpit-stat>span{display:block;color:#687791;font-size:.78rem;font-weight:850;text-transform:uppercase;letter-spacing:.06em}
.cockpit-stat strong{display:block;margin:5px 0 2px;font-size:1.55rem;line-height:1.2}
.cockpit-stat small{color:#78859a}
.cockpit-meter{height:7px;margin-top:11px;border-radius:999px;background:#e7edf6;overflow:hidden}
.cockpit-meter span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .25s ease}
.next-action-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:12px;margin-top:12px}
.next-action{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:22px;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 10px 32px rgba(31,51,86,.05)}
.next-action h3{margin:.15em 0 .25em;font-size:1.28rem}
.next-action p{margin:.25em 0}
.primary-next{background:linear-gradient(135deg,#15223b,#22385f);border-color:#243a63;color:#fff}
.primary-next p,.primary-next .eyebrow{color:#cfd9eb}
.primary-next .primary-cta{white-space:nowrap;background:#fff;color:#172033;box-shadow:none}

.path-stack{display:grid;gap:12px}
.path-stage{display:grid;grid-template-columns:78px minmax(0,1fr);gap:18px;padding:24px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(145deg,#fff,#f8faff);box-shadow:0 8px 28px rgba(31,51,86,.04)}
.path-number{display:grid;place-items:center;width:64px;height:64px;border-radius:18px;background:#172033;color:#fff;font-size:1.25rem;font-weight:900;letter-spacing:.04em}
.path-copy h3{margin:.1em 0 .35em;font-size:1.45rem}
.path-copy p{margin:.25em 0 12px}
.path-links{display:flex;gap:7px;flex-wrap:wrap}
.path-links a{padding:6px 10px;border:1px solid #ccd8e9;border-radius:999px;background:#fff;color:#304b7a;text-decoration:none;font-size:.8rem;font-weight:850}
.path-links a:hover{background:#edf3ff;border-color:#abc0e7}

.practice-lanes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.practice-lane{min-height:245px;padding:22px;border:1px solid #d8e1ec;border-radius:20px;background:#fff;box-shadow:0 8px 28px rgba(31,51,86,.045)}
.practice-lane h3{margin:.25em 0 .2em;font-size:1.35rem}
.practice-lane p{margin:.25em 0 16px}
.lane-code{font-size:.74rem;font-weight:900;color:#315fcb;letter-spacing:.07em}
.lane-links{display:flex;gap:7px;flex-wrap:wrap}
.lane-links a{padding:7px 10px;border-radius:9px;background:#eef3f9;color:#334866;text-decoration:none;font-size:.82rem;font-weight:850}
.lane-links a:hover{background:#dfe9f8}
.all-tools{margin-top:14px;border:1px solid #d7e0ec;border-radius:14px;background:#fff}
.all-tools summary{padding:13px 15px;font-weight:850;cursor:pointer}
.compact-tools{display:flex;gap:7px;flex-wrap:wrap;padding:0 15px 15px}
.compact-tools a{padding:7px 9px;border-radius:8px;background:#f3f6fa;text-decoration:none;font-size:.82rem;font-weight:800}

.mental-section{display:grid;gap:12px}
.mental-section>.section-heading{margin-bottom:6px}
.mental-card{border:1px solid var(--line);border-radius:18px;background:#fff;overflow:hidden;box-shadow:0 8px 24px rgba(31,51,86,.035)}
.mental-card>summary{padding:16px 18px;font-size:1rem;font-weight:900;cursor:pointer;background:#f8faff}
.mental-card[open]>summary{border-bottom:1px solid var(--line)}
.mental-card>.flow,.mental-card>.code-lab,.mental-card>.debug-grid,.mental-card>.explain,.mental-card>.roadmap{margin-left:18px;margin-right:18px}
.mental-card>.code-lab,.mental-card>.debug-grid,.mental-card>.roadmap{margin-top:18px;margin-bottom:18px}
.system-map-section .mental-card{margin-top:16px}
.final-nav{display:flex;justify-content:space-between;gap:24px;align-items:center}
.final-nav h2{margin:.1em 0}

@media(max-width:980px){
  .cockpit-grid{grid-template-columns:1fr 1fr}
  .cockpit-stat:last-child{grid-column:1/-1}
  .next-action-grid{grid-template-columns:1fr}
  .practice-lanes{grid-template-columns:1fr 1fr}
}
@media(max-width:700px){
  .topbar{align-items:flex-start}
  .topbar nav{display:flex;flex-wrap:nowrap;max-width:68vw;overflow-x:auto;overscroll-behavior-inline:contain;padding-bottom:3px}
  .topbar nav a{white-space:nowrap;flex:0 0 auto}
  .cockpit-grid,.practice-lanes{grid-template-columns:1fr}
  .cockpit-stat:last-child{grid-column:auto}
  .next-action{display:block}
  .next-action a{margin-top:12px}
  .path-stage{grid-template-columns:54px minmax(0,1fr);padding:18px;gap:12px}
  .path-number{width:48px;height:48px;border-radius:14px;font-size:.95rem}
  .final-nav{display:block}
}
@media(max-width:430px){
  .topbar nav{max-width:62vw}
}


/* MASTERY SCENARIO SETS */
.inline-mastery-set{
  display:grid;
  gap:1rem;
  margin:1rem 0;
}
.inline-mastery-item{
  border:1px solid currentColor;
  border-radius:14px;
  padding:1rem;
}
.inline-case-kicker,
.inline-question-selection{
  font-size:.86rem;
  opacity:.72;
}
.inline-mastery-item .inline-choices{
  margin-top:.75rem;
}
.inline-mastery-item button[aria-pressed="true"]{
  outline:2px solid currentColor;
  outline-offset:2px;
}
.inline-case-result,
.inline-check-results{
  white-space:pre-wrap;
}


/* DIAGNOSTIC EVIDENCE LAB */
.diagnostic-set{display:grid;gap:1rem;margin:1rem 0}
.diagnostic-scenario{border:1px solid var(--line);border-radius:16px;padding:1rem;background:#fff}
.diagnostic-scenario h3{margin:.35rem 0 .55rem}
.diagnostic-instruction{margin:.35rem 0 .85rem;color:#66748c;font-size:.9rem}
.diagnostic-evidence-grid{display:flex;gap:.55rem;flex-wrap:wrap;margin:.75rem 0}
.diagnostic-evidence-button{border:1px solid #cbd6e6;background:#f7f9fc;border-radius:10px;padding:.55rem .75rem;cursor:pointer;font:inherit;font-weight:800}
.diagnostic-evidence-button[aria-pressed="true"]{background:#e7eefb;border-color:#8ba7d3}
.diagnostic-evidence-output{min-height:92px;white-space:pre-wrap;margin:.65rem 0 1rem}
.diagnostic-diagnoses{border-top:1px solid var(--line);padding-top:.9rem}
.diagnostic-diagnoses .inline-choices{margin-top:.65rem}


/* STATEFUL TERMINAL LAB */
.stateful-terminal-lab{display:grid;gap:.9rem;margin:1rem 0}
.stateful-terminal-state{border:1px solid var(--line);border-radius:14px;padding:.9rem;background:#f8faff}
.stateful-terminal-state>strong{display:block;margin-bottom:.55rem}
.stateful-terminal-state pre{min-height:70px;white-space:pre-wrap}
.stateful-terminal-step{border-left:4px solid var(--accent);padding:.8rem 1rem;background:#f7f9fc;border-radius:0 12px 12px 0}
.stateful-terminal-step h3{margin:.2rem 0 .4rem}
.stateful-terminal-transcript{min-height:180px;max-height:360px;white-space:pre-wrap;overflow:auto}


/* INLINE REAL SQLITE LAB */
.inline-sql-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(240px,.65fr);gap:1rem;margin:1rem 0}
.inline-sql-work,.inline-sql-schema{border:1px solid var(--line);border-radius:14px;padding:1rem;background:#fff}
.inline-sql-editor{min-height:190px}
.inline-sql-result{min-height:90px;border:1px solid #d8e1ed;border-radius:12px;padding:.8rem;overflow:auto;background:#f9fbfd;white-space:pre-wrap}
.inline-sql-result.error{background:#fff2f2;color:#9c3131}
.inline-sql-schema pre{margin-top:.6rem;max-height:360px;white-space:pre-wrap}
.inline-sql-table{border-collapse:collapse;width:100%;font-size:.9rem}
.inline-sql-table th,.inline-sql-table td{border-bottom:1px solid #e1e7ef;padding:.55rem .65rem;text-align:left;white-space:nowrap}
.inline-sql-table th{background:#f2f5fa}
@media(max-width:800px){.inline-sql-layout{grid-template-columns:1fr}}


/* INLINE REAL TYPESCRIPT LAB */
.inline-ts-layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);gap:1rem;margin:1rem 0}
.inline-ts-layout>section{border:1px solid var(--line);border-radius:14px;padding:1rem;background:#fff}
.inline-ts-editor{min-height:250px}
.inline-ts-evidence{display:grid;gap:.8rem}
.inline-ts-evidence>div,.inline-ts-evidence>details{border:1px solid #dbe3ee;border-radius:12px;padding:.8rem;background:#f8faff}
.inline-ts-evidence strong{display:block;margin-bottom:.45rem}
.inline-ts-evidence pre{min-height:90px;max-height:260px;overflow:auto;white-space:pre-wrap}
.inline-ts-runtime-error{border:1px solid #efc5c5;border-radius:12px;padding:1rem;background:#fff2f2;color:#8b2f2f}
@media(max-width:860px){.inline-ts-layout{grid-template-columns:1fr}}


/* INLINE REAL REACT LAB */
.inline-react-layout{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(320px,.95fr);gap:1rem;margin:1rem 0}
.inline-react-work,.inline-react-preview-panel{border:1px solid var(--line);border-radius:14px;padding:1rem;background:#fff}
.inline-react-editor{min-height:300px}
.inline-react-preview-panel{display:grid;gap:.7rem;align-content:start}
.inline-react-preview{width:100%;min-height:300px;border:1px solid #d7e0ec;border-radius:12px;background:#fff}
.inline-react-compiler{min-height:72px;margin-top:.8rem;white-space:pre-wrap}
.inline-react-checks{display:grid;gap:.55rem}
.inline-react-check{display:grid;grid-template-columns:24px minmax(0,1fr) auto;gap:.6rem;align-items:start;padding:.7rem;border:1px solid #dce4ed;border-radius:10px;background:#f8faff}
.inline-react-check.pass{background:#effaf3;border-color:#bee2ca}
.inline-react-check.fail{background:#fff2f2;border-color:#edc6c6}
.inline-react-runtime-error{border:1px solid #efc5c5;border-radius:12px;padding:1rem;background:#fff2f2;color:#8b2f2f}
@media(max-width:900px){.inline-react-layout{grid-template-columns:1fr}}


/* INLINE REAL TEST RUNNER LAB */
.inline-test-exec-layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);gap:1rem;margin:1rem 0}
.inline-test-exec-layout>section{border:1px solid var(--line);border-radius:14px;padding:1rem;background:#fff}
.inline-test-editor{min-height:280px}
.inline-test-report-panel{display:grid;align-content:start;gap:.65rem}
.inline-test-report{min-height:220px;max-height:420px;overflow:auto;white-space:pre-wrap;background:#0b1220;color:#dbe8ff;border-radius:12px;padding:.9rem}
@media(max-width:860px){.inline-test-exec-layout{grid-template-columns:1fr}}


/* PROJECT EVIDENCE GATE */
.project-evidence-note{margin:1rem 0;padding:1rem;border:1px solid #c8d7eb;border-radius:14px;background:#f4f8ff}
.project-evidence-note p{margin:.45rem 0 0}
.project-evidence-grid{display:grid;gap:1rem}
.project-evidence-card{border:1px solid var(--line);border-radius:14px;padding:1rem;background:#fff}
.project-evidence-card h3{margin:.25rem 0 .5rem}
.project-evidence-card ul{margin:.7rem 0;padding-left:1.25rem}
.project-evidence-label{display:grid;gap:.45rem;font-weight:800;margin-top:.8rem}
.project-evidence-input{min-height:150px}
.project-attest{display:flex;gap:.55rem;align-items:flex-start;margin-top:.7rem;font-weight:700}
.project-attest input{margin-top:.2rem}
.project-evidence-results{margin-top:.8rem;white-space:pre-wrap}