/* ============================================================
   Lunolabs Advanced Course — Shared Stylesheet
   Used by all pages in /advanced_motors/
   See ../DESIGN.md for the full design system
   ============================================================ */

:root{
  --navy:#0B1E3F; --navy-2:#142E5C; --navy-3:#1E3A6E;
  --cyan:#22D3EE; --cyan-soft:#A5F3FC; --cyan-deep:#0EA5E9;
  --bg:#F6F9FC; --card:#FFFFFF; --code-bg:#0B1E3F;
  --text:#0B1E3F; --muted:#5A6B85; --border:#E6EDF6;
  --good:#16A34A; --bad:#DC2626; --warn:#F59E0B;
  --orange:#F97316; --pink:#EC4899; --yellow:#FCD34D;
  --shadow: 0 10px 30px rgba(11,30,63,.08);
  --shadow-md: 0 4px 12px rgba(11,30,63,.06);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);
  font-family:'Plus Jakarta Sans',system-ui,sans-serif;line-height:1.6;}
a{color:var(--cyan-deep);text-decoration:none}
a:hover{text-decoration:underline}

/* ============ HEADER ============ */
header.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);
  backdrop-filter:blur(12px);border-bottom:1px solid rgba(11,30,63,.08);}
.topbar-inner{max-width:1100px;margin:0 auto;padding:14px 22px;
  display:flex;align-items:center;gap:18px;}
.logo{display:inline-flex;align-items:flex-start;gap:1px;font-weight:800;
  font-size:24px;color:var(--navy);letter-spacing:-1px;text-decoration:none;line-height:1;}
.logo .brand-spark{width:13px;height:13px;margin-top:-3px;margin-left:1px;flex-shrink:0;display:block}
.logo:hover{text-decoration:none}
.breadcrumb{flex:1;font-size:13px;color:var(--muted);font-weight:500}
.breadcrumb a{color:var(--muted);text-decoration:none}
.breadcrumb a:hover{color:var(--cyan-deep);text-decoration:underline}
.breadcrumb .sep{margin:0 8px;color:#CBD5E0}
.breadcrumb .here{color:var(--navy);font-weight:700}
.level-badge{font-size:11px;font-weight:800;background:var(--navy);color:var(--cyan);
  padding:5px 10px;border-radius:99px;letter-spacing:.5px;}

/* ============ MAIN ============ */
main{max-width:1100px;margin:0 auto;padding:30px 22px 80px}
section{background:var(--card);border-radius:20px;padding:36px;margin:22px 0;box-shadow:var(--shadow);}

/* ============ HERO ============ */
.hero{background:radial-gradient(1200px 400px at 80% -10%, rgba(34,211,238,.18), transparent 60%),
  linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%);
  color:white;position:relative;overflow:hidden;padding:48px 36px;}
.hero h1{font-size:clamp(28px,4vw,42px);line-height:1.15;margin:0 0 12px;font-weight:800}
.hero h1 .accent{color:var(--cyan)}
.hero p.lead{font-size:17px;color:#D8E2F1;max-width:600px;margin:0 0 22px;line-height:1.6}
.hero .meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chip{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);color:#fff;
  font-size:13px;padding:6px 12px;border-radius:99px;font-weight:500}
.chip-cyan{background:var(--cyan);color:var(--navy);border:0;font-weight:700}
.hero-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:30px;align-items:center}
@media (max-width:780px){.hero-grid{grid-template-columns:1fr}}
.hero-stage{aspect-ratio:1/1;max-width:320px;margin:0 auto}
.hero-stage svg{width:100%;height:100%}

/* ============ HEADINGS ============ */
h2{font-size:26px;margin:0 0 8px;font-weight:800;letter-spacing:-.3px}
h2 .num{display:inline-block;background:var(--cyan);color:var(--navy);font-size:13px;
  padding:4px 10px;border-radius:99px;margin-right:10px;font-weight:800;vertical-align:middle}
h3{font-size:18px;margin:0 0 8px;font-weight:700}
.sub{color:var(--muted);margin-top:0;margin-bottom:24px;font-size:15px}

/* ============ GRIDS ============ */
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-5{grid-template-columns:repeat(5,1fr)}
@media (max-width:780px){.grid-3,.grid-4,.grid-5{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.grid-2,.grid-3,.grid-4,.grid-5{grid-template-columns:1fr}}

/* ============ CARDS ============ */
.card{background:#F8FBFE;border:1px solid var(--border);border-radius:14px;padding:20px;
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--cyan)}
.card h3{margin:0 0 6px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:14px}
.card .icon{font-size:32px;margin-bottom:8px;display:block}

/* Motor card on hub */
.motor-link-card{background:#F8FBFE;border:1px solid var(--border);border-radius:16px;padding:24px;
  text-decoration:none;color:var(--text);display:block;
  transition:all .2s ease;position:relative;overflow:hidden;}
.motor-link-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);
  border-color:var(--cyan);text-decoration:none;}
.motor-link-card.disabled{opacity:.5;pointer-events:none}
.motor-link-card .ml-svg{width:80px;height:80px;display:block;margin:0 auto 12px}
.motor-link-card h3{font-size:18px;text-align:center;margin:8px 0 4px}
.motor-link-card .ml-tag{display:inline-block;background:var(--cyan);color:var(--navy);
  font-size:10px;padding:2px 8px;border-radius:99px;font-weight:800;margin:2px;letter-spacing:.5px}
.motor-link-card .ml-desc{font-size:13px;color:var(--muted);text-align:center;margin:8px 0 0;min-height:40px}
.motor-link-card .ml-arrow{position:absolute;top:14px;right:14px;color:var(--cyan);font-weight:800;
  opacity:0;transform:translateX(-5px);transition:all .2s ease;}
.motor-link-card:hover .ml-arrow{opacity:1;transform:translateX(0)}
.coming-soon{position:absolute;top:14px;right:14px;background:#FEF3C7;color:#92400E;
  font-size:10px;padding:3px 8px;border-radius:99px;font-weight:800;letter-spacing:.5px}

/* ============ SPEC TABLE ============ */
.spec-table{width:100%;border-collapse:collapse;font-size:14px;margin:0;background:white;border-radius:10px;overflow:hidden}
.spec-table th, .spec-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border)}
.spec-table th{background:var(--navy);color:var(--cyan);font-weight:700;font-size:13px;letter-spacing:.3px;text-transform:uppercase}
.spec-table tr:last-child td{border-bottom:0}
.spec-table tr:nth-child(even) td{background:#F8FBFE}
.spec-table .mono{font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--cyan-deep)}

/* ============ CODE BLOCKS ============ */
.code-block{background:var(--code-bg);color:#A5F3FC;border-radius:12px;padding:18px 20px;
  font-family:'JetBrains Mono',monospace;font-size:13px;line-height:1.7;
  overflow-x:auto;margin:14px 0;position:relative}
.code-block .lang-tag{position:absolute;top:8px;right:12px;background:var(--cyan);color:var(--navy);
  font-size:10px;padding:2px 8px;border-radius:99px;font-weight:800;letter-spacing:.5px;
  font-family:'Plus Jakarta Sans',sans-serif}
.code-block .kw{color:#FB923C}
.code-block .str{color:#A5F3FC}
.code-block .num{color:#FCD34D}
.code-block .com{color:#5A6B85;font-style:italic}
.code-block .fn{color:#22D3EE}
.code-block .var{color:#F472B6}

/* ============ BUTTONS ============ */
button.btn, a.btn{background:var(--navy);color:white;border:none;padding:11px 22px;
  border-radius:10px;font-weight:600;cursor:pointer;font-family:inherit;font-size:14px;
  text-decoration:none;display:inline-block;transition:transform .15s ease, background .15s ease;}
button.btn:hover, a.btn:hover{background:var(--navy-2);transform:translateY(-2px);text-decoration:none;color:white}
button.btn.cyan, a.btn.cyan{background:var(--cyan);color:var(--navy)}
button.btn.cyan:hover, a.btn.cyan:hover{background:var(--cyan-soft);color:var(--navy)}
button.btn.ghost, a.btn.ghost{background:transparent;color:var(--navy);border:2px solid var(--navy)}
button.btn.ghost:hover, a.btn.ghost:hover{background:var(--navy);color:white}

/* ============ INTERACTIVE STAGE ============ */
.demo-stage{background:radial-gradient(ellipse at center 50%, #DCEEF6 0%, #F0F7FB 70%);
  border-radius:16px;padding:24px;}
.demo-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:center}
@media (max-width:780px){.demo-grid{grid-template-columns:1fr}}

/* Sliders */
.my-slider{-webkit-appearance:none;appearance:none;width:240px;height:8px;background:#E6EDF6;
  border-radius:99px;outline:none}
.my-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:24px;height:24px;
  background:var(--cyan);border:3px solid var(--navy);border-radius:50%;cursor:pointer;
  box-shadow:0 2px 8px rgba(11,30,63,.2)}
.my-slider::-moz-range-thumb{width:24px;height:24px;background:var(--cyan);
  border:3px solid var(--navy);border-radius:50%;cursor:pointer}
.slider-row{display:flex;align-items:center;gap:14px;justify-content:center;flex-wrap:wrap;margin:10px 0}
.slider-row label{font-weight:600;font-size:14px;min-width:100px}
.slider-val{font-family:'JetBrains Mono',monospace;font-size:16px;font-weight:800;
  color:var(--navy);min-width:64px;background:white;padding:4px 10px;border-radius:8px}

/* ============ CALLOUTS ============ */
.callout{border-radius:12px;padding:16px 18px;margin:18px 0;font-size:14px;line-height:1.6;display:flex;gap:12px;align-items:flex-start}
.callout .ico{font-size:20px;flex-shrink:0}
.callout.info{background:#EFF6FF;border-left:4px solid #3B82F6;color:#1E3A8A}
.callout.warn{background:#FFFBEB;border-left:4px solid var(--warn);color:#78350F}
.callout.danger{background:#FEF2F2;border-left:4px solid var(--bad);color:#7F1D1D}
.callout.success{background:#F0FDF4;border-left:4px solid var(--good);color:#14532D}
.callout.tech{background:#F8FAFC;border-left:4px solid var(--navy);color:var(--navy)}
.callout b{display:block;margin-bottom:4px;font-weight:700}

/* ============ SCHEMATIC / WIRING ============ */
.wiring-stage{background:#F8FBFE;border:1px dashed var(--border);border-radius:14px;
  padding:24px;text-align:center}
.wiring-stage svg{max-width:100%;height:auto}
.pin-table{font-size:13px}
.pin-color{display:inline-block;width:14px;height:14px;border-radius:3px;vertical-align:middle;margin-right:6px}

/* ============ STEP LIST ============ */
.step-list{counter-reset:step;display:grid;gap:12px}
.step{display:flex;gap:14px;align-items:flex-start;background:#F8FBFE;
  padding:16px;border-radius:12px;border-left:3px solid var(--cyan);}
.step::before{counter-increment:step;content:counter(step);background:var(--navy);color:var(--cyan);
  width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-weight:800;flex-shrink:0;font-size:14px;}
.step h4{margin:0 0 4px;font-size:15px;font-weight:700}
.step p{margin:0;color:var(--muted);font-size:14px}

/* ============ CTA ============ */
.cta{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:white;padding:36px;
  border-radius:20px;position:relative;overflow:hidden;
  display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:center;}
@media (max-width:680px){.cta{grid-template-columns:1fr;text-align:center}.cta .phoenix-mark{margin:0 auto}}
.cta::before{content:'';position:absolute;top:-50%;right:-10%;width:300px;height:300px;
  background:radial-gradient(circle,var(--cyan) 0%,transparent 70%);opacity:.18;pointer-events:none;}
.cta-content{position:relative;z-index:2}
.cta h2{color:white;font-size:24px;margin:0 0 8px}
.cta p{color:#D8E2F1;margin:0 0 18px;max-width:520px;font-size:15px}
.cta .btn{background:var(--cyan);color:var(--navy)}
.phoenix-mark{width:120px;height:120px;flex-shrink:0;position:relative;z-index:2;
  filter:drop-shadow(0 6px 24px rgba(249,115,22,.35));animation:phoenixFloat 4s ease-in-out infinite;}
.phoenix-mark svg{width:100%;height:100%}
@keyframes phoenixFloat{0%,100%{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-6px) rotate(2deg)}}

/* ============ FOOTER ============ */
footer{text-align:center;color:var(--muted);font-size:13px;padding:30px 22px}
footer a{color:var(--muted)}

/* ============ REVEAL ANIMATION ============ */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .6s ease, transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ============ PROS/CONS ============ */
.pros-cons{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:14px}
@media (max-width:680px){.pros-cons{grid-template-columns:1fr}}
.pros, .cons{padding:18px 20px;border-radius:14px}
.pros{background:#F0FDF4;border-left:4px solid var(--good)}
.cons{background:#FEF2F2;border-left:4px solid var(--bad)}
.pros h4, .cons h4{margin:0 0 10px;font-size:15px;font-weight:700}
.pros h4{color:var(--good)} .cons h4{color:var(--bad)}
.pros ul, .cons ul{margin:0;padding-left:20px;font-size:14px;line-height:1.7}
.pros li, .cons li{margin:4px 0}

/* ============ NEXT/PREV PAGE NAV ============ */
.page-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:24px}
@media (max-width:520px){.page-nav{grid-template-columns:1fr}}
.page-nav a{background:#F8FBFE;border:1px solid var(--border);border-radius:14px;padding:18px 20px;
  display:block;text-decoration:none;color:var(--text);transition:all .2s ease}
.page-nav a:hover{border-color:var(--cyan);transform:translateY(-2px);text-decoration:none}
.page-nav .dir{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;font-weight:700}
.page-nav .ttl{font-size:16px;font-weight:700;margin-top:4px}
.page-nav .right{text-align:right}


/* ============ COPY BUTTON ============ */
.code-block .lang-tag{right:78px}
.copy-btn{position:absolute;top:8px;right:10px;background:rgba(34,211,238,.18);
  color:#22D3EE;border:1px solid rgba(34,211,238,.35);border-radius:99px;
  padding:4px 12px;font-size:10px;font-weight:800;cursor:pointer;
  transition:all .15s ease;letter-spacing:.5px;text-transform:uppercase;
  font-family:'Plus Jakarta Sans',sans-serif;display:inline-flex;align-items:center;gap:5px;z-index:2}
.copy-btn:hover{background:rgba(34,211,238,.32);transform:translateY(-1px)}
.copy-btn:active{transform:translateY(0)}
.copy-btn.copied{background:#16A34A;color:white;border-color:#16A34A}