/* ── Diving The Dream · Course Pages Shared Stylesheet ── */
:root{
  --bg:#04090e;--bg2:#081420;--bg3:#0d1f2d;--steel:#122233;
  --accent:#00c8f0;--glow:rgba(0,200,240,.18);
  --text:#ddeef5;--muted:#5a7d8e;--border:#1a3447;
  --rust2:#e07843;--bio:#00e5a0;
  --font-d:'Teko',sans-serif;--font-b:'DM Sans',sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{background:var(--bg);color:var(--text);font-family:var(--font-b);font-weight:300;line-height:1.8;overflow-x:hidden}

/* NAV */
nav{position:sticky;top:0;z-index:100;padding:1.25rem 2.5rem;background:rgba(4,9,14,.9);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
nav a.logo-link{text-decoration:none;line-height:0}
.nav-logo-canvas{height:44px;width:220px;display:block}
nav a.nav-back{font-family:var(--font-b);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);text-decoration:none;display:flex;align-items:center;gap:.5rem;transition:color .2s}
nav a.nav-back::before{content:'←'}
nav a.nav-back:hover{color:var(--accent)}
nav a.nav-cta{font-family:var(--font-b);font-size:.72rem;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--bg);background:var(--accent);padding:.5rem 1.2rem;text-decoration:none;transition:background .2s}
nav a.nav-cta:hover{background:#fff}

/* HERO */
.course-hero{padding:5rem 2.5rem 4rem;border-bottom:1px solid var(--border);max-width:1100px;margin:0 auto}
.breadcrumb{font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:1.5rem;display:flex;align-items:center;gap:.6rem;flex-wrap:wrap}
.breadcrumb a{color:var(--muted);text-decoration:none;transition:color .2s}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{color:var(--border)}
.level-badge{display:inline-block;font-family:var(--font-b);font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;padding:.3rem .8rem;margin-bottom:1rem}
.level-tech{background:rgba(0,200,240,.12);color:var(--accent);border:1px solid rgba(0,200,240,.3)}
.level-intro{background:rgba(0,229,160,.1);color:var(--bio);border:1px solid rgba(0,229,160,.25)}
.level-advanced{background:rgba(224,120,67,.12);color:var(--rust2);border:1px solid rgba(224,120,67,.25)}
.level-pro{background:rgba(221,238,245,.08);color:var(--text);border:1px solid var(--border)}
h1{font-family:var(--font-d);font-size:clamp(3rem,7vw,6rem);font-weight:700;line-height:.92;letter-spacing:-.01em;text-transform:uppercase;margin-bottom:.8rem}
h1 em{display:block;font-style:normal;color:var(--accent);font-weight:300}
.hero-tagline{font-size:1.05rem;color:var(--muted);max-width:620px;line-height:1.7;margin-bottom:2rem}
.hero-actions{display:flex;gap:1rem;flex-wrap:wrap}
.btn-primary{font-family:var(--font-b);font-size:.78rem;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--bg);background:var(--accent);padding:.85rem 2rem;text-decoration:none;display:inline-flex;align-items:center;gap:.5rem;transition:background .2s,box-shadow .2s}
.btn-primary:hover{background:#fff;box-shadow:0 0 30px var(--glow)}
.btn-standards{font-family:var(--font-b);font-size:.78rem;font-weight:400;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);border:1px solid var(--border);padding:.85rem 2rem;text-decoration:none;display:inline-flex;align-items:center;gap:.5rem;transition:border-color .2s,background .2s}
.btn-standards::before{content:'↗';font-size:.9rem}
.btn-standards:hover{border-color:var(--accent);background:var(--steel)}

/* BODY LAYOUT */
.course-wrap{max-width:1100px;margin:0 auto;padding:4rem 2.5rem 6rem;display:grid;grid-template-columns:1fr 340px;gap:5rem;align-items:start}
@media(max-width:900px){.course-wrap{grid-template-columns:1fr;gap:3rem}}

/* CONTENT */
.course-content h2{font-family:var(--font-d);font-size:1.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text);margin:2.5rem 0 .8rem;padding-top:2.5rem;border-top:1px solid var(--border)}
.course-content h2:first-child{border-top:none;padding-top:0;margin-top:0}
.course-content h2 em{font-style:normal;color:var(--accent)}
.course-content p{font-size:.92rem;color:var(--muted);line-height:1.85;margin-bottom:1rem}
.course-content p strong{color:var(--text);font-weight:500}
.course-content ul,.course-content ol{font-size:.9rem;color:var(--muted);padding-left:1.4rem;margin-bottom:1.2rem}
.course-content li{margin-bottom:.5rem;line-height:1.7}
.course-content li strong{color:var(--text);font-weight:500}
.callout{border-left:3px solid var(--accent);padding:1.1rem 1.4rem;background:var(--bg2);margin:1.5rem 0}
.callout p{margin:0;color:var(--text);font-size:.88rem}
.related-sites{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.8rem}
.site-chip{font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;border:1px solid var(--border);padding:.25rem .65rem;color:var(--muted);text-decoration:none;transition:border-color .2s,color .2s;display:inline-block}
.site-chip:hover{border-color:var(--accent);color:var(--accent)}

/* SIDEBAR */
.course-sidebar{position:sticky;top:80px;display:flex;flex-direction:column;gap:1px;background:var(--border)}
.sidebar-card{background:var(--bg2);padding:1.5rem}
.sidebar-label{font-family:var(--font-d);font-size:.62rem;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);margin-bottom:.8rem;opacity:.7}
.fact-row{display:flex;justify-content:space-between;align-items:baseline;padding:.5rem 0;border-bottom:1px solid var(--border);font-size:.82rem}
.fact-row:last-child{border-bottom:none}
.fact-key{color:var(--muted)}
.fact-val{color:var(--text);font-family:var(--font-d);font-size:1rem;font-weight:600;letter-spacing:.04em}
.next-course{display:block;padding:.9rem 1rem;background:var(--bg);border:1px solid var(--border);text-decoration:none;transition:border-color .2s,background .2s;margin-top:.4rem}
.next-course:hover{border-color:var(--accent);background:var(--steel)}
.next-label{font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.next-name{font-family:var(--font-d);font-size:1.1rem;font-weight:600;text-transform:uppercase;color:var(--text);margin-top:.2rem;line-height:1}
.sidebar-cta{display:block;background:var(--accent);color:var(--bg);font-family:var(--font-b);font-size:.78rem;font-weight:500;letter-spacing:.12em;text-transform:uppercase;padding:1rem;text-align:center;text-decoration:none;transition:background .2s}
.sidebar-cta:hover{background:#fff}
.standards-link{display:flex;align-items:center;gap:.6rem;font-size:.75rem;color:var(--muted);text-decoration:none;padding:.6rem 0;border-bottom:1px solid var(--border);transition:color .2s}
.standards-link:last-child{border-bottom:none}
.standards-link:hover{color:var(--accent)}
.standards-link::before{content:'↗';color:var(--accent);font-size:.9rem;flex-shrink:0}

/* FOOTER */
footer{background:var(--bg);border-top:1px solid var(--border);padding:2rem 2.5rem}
.footer-inner{max-width:1100px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}
.footer-copy{font-size:.7rem;color:var(--muted);letter-spacing:.05em}
.footer-copy a{color:var(--muted);text-decoration:none;transition:color .2s}
.footer-copy a:hover{color:var(--accent)}
@media(max-width:600px){
  .course-hero{padding:3rem 1.5rem 2.5rem}
  .course-wrap{padding:3rem 1.5rem 4rem}
  nav{padding:1rem 1.5rem}
}

/* CANVAS LOGO */
.nav-logo-canvas{image-rendering:auto}