/* Shared course styles — inherits the site design system */
/* Used by: courses/01-requirements-gathering/ and future courses */

:root{
  --bg:#0A0B0D;
  --bg-1:#0E1013;
  --surface:#111317;
  --elev:#15181D;
  --border:#1E2228;
  --border-2:#2A2F38;
  --hair:rgba(255,255,255,0.06);
  --text:#EDEEF0;
  --text-2:#9BA1AA;
  --text-3:#7E8694;
  --accent: oklch(0.80 0.17 155);
  --accent-dim: oklch(0.80 0.17 155 / 0.14);
  --accent-glow: oklch(0.80 0.17 155 / 0.35);
  --sans:'Geist', ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;
  --mono:'Geist Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --serif:'Instrument Serif', ui-serif, Georgia, serif;
  --max: 1280px;
  --measure: 680px;
  --gutter: 24px;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{
  background:
    radial-gradient(900px 600px at 80% -10%, rgba(80,230,160,0.06), transparent 60%),
    radial-gradient(700px 500px at 10% 10%, rgba(40,60,90,0.14), transparent 70%),
    var(--bg);
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
::selection{background:var(--accent);color:#000}

.grid-bg{position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(1200px 800px at 50% 20%, #000 40%, transparent 85%);
}

.shell{max-width:var(--max);margin:0 auto;padding:0 var(--gutter);position:relative;z-index:1}

/* Nav */
.nav{position:sticky;top:0;z-index:50;padding:16px 0}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 14px 10px 14px;
  border:1px solid var(--hair);
  background:rgba(14,16,19,0.6);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-radius:999px;
}
.brand{display:flex;align-items:center;gap:12px;font-weight:500;letter-spacing:-0.01em}
.brand-mark{
  width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,var(--accent) 0%, oklch(0.55 0.14 170) 100%);
  display:grid;place-items:center;
  font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:0.04em;color:#04140B;
  box-shadow:0 0 0 1px rgba(0,0,0,.35), inset 0 0 0 1px rgba(255,255,255,.18);
}
.brand-mark::after{content:"MH"}
.brand-name{display:flex;flex-direction:column;line-height:1.1}
.brand-name b{font-weight:500;font-size:14px;color:var(--text)}
.brand-name em{font-style:normal;font-family:var(--mono);font-size:10px;letter-spacing:0.12em;text-transform:uppercase;color:var(--text-3);margin-top:2px}
.back-link{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;color:var(--text-2);padding:8px 14px;border-radius:999px;letter-spacing:0.04em}
.back-link:hover{color:var(--text);background:var(--hair)}
.eyebrow{font-family:var(--mono);font-size:11.5px;letter-spacing:0.14em;color:var(--text-3);text-transform:uppercase;display:inline-flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--border-2)}
.chip{font-family:var(--mono);font-size:11px;padding:5px 10px;border-radius:6px;border:1px solid var(--border);color:var(--text-2);background:rgba(255,255,255,0.02)}
.chip.accent{color:var(--accent);border-color:oklch(0.80 0.17 155 / 0.4)}
.callout{margin:28px 0;border:1px solid var(--border);border-radius:10px;padding:18px 20px;background:linear-gradient(180deg,rgba(21,24,29,0.6),rgba(14,16,19,0.6));display:flex;gap:14px;align-items:flex-start}
.callout .tag{font-family:var(--mono);font-size:10px;letter-spacing:0.14em;text-transform:uppercase;color:var(--accent);padding:3px 8px;border:1px solid oklch(0.80 0.17 155 / 0.4);border-radius:4px;flex:none;margin-top:2px}
.callout p{margin:0;font-size:14.5px;line-height:1.6}

/* ─── Course Landing Page ─── */
.course-head{padding:72px 0 56px;border-bottom:1px solid var(--border)}
.course-head h1{font-size:clamp(32px,4.8vw,60px);font-weight:500;letter-spacing:-0.03em;line-height:1.05;margin:20px 0 0;max-width:18ch}
.course-head h1 .serif{font-family:var(--serif);font-style:italic;font-weight:400}
.course-head .lede{font-size:17px;line-height:1.6;color:var(--text-2);margin-top:20px;max-width:58ch}
.course-meta-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.course-meta-row .chip{font-size:11px}

/* What you'll learn */
.learn-list{margin:48px 0 0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.learn-list li{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border:1px solid var(--border);border-radius:10px;background:rgba(21,24,29,0.5);font-size:14.5px;color:var(--text-2);line-height:1.45}
.learn-list li::before{content:"✓";font-family:var(--mono);font-size:12px;color:var(--accent);flex:none;margin-top:1px}
@media(max-width:680px){.learn-list{grid-template-columns:1fr}}

/* Lesson list */
.lessons-section{padding:56px 0}
.lessons-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;flex-wrap:wrap;gap:12px}
.lessons-header h2{font-size:22px;font-weight:500;letter-spacing:-0.02em;margin:0}
.unlock-btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border-radius:999px;
  background:var(--accent);color:#04140B;
  font-family:var(--sans);font-weight:500;font-size:14px;
  border:none;cursor:pointer;
  transition:opacity .2s ease, transform .15s ease, box-shadow .2s ease;
  box-shadow:0 0 0 0 var(--accent-glow);
  text-decoration:none;
}
.unlock-btn:hover{opacity:0.88;transform:translateY(-1px);box-shadow:0 4px 20px var(--accent-glow)}
.unlock-btn:active{transform:none;opacity:1}
.unlock-btn svg{width:14px;height:14px;flex:none}

.lesson-list{list-style:none;padding:0;margin:0;border:1px solid var(--border);border-radius:14px;overflow:hidden}
.lesson-item{
  display:flex;align-items:center;gap:16px;
  padding:18px 22px;
  border-bottom:1px solid var(--border);
  transition:background .18s ease;
  cursor:default;
}
.lesson-item:last-child{border-bottom:none}
.lesson-item.unlocked{cursor:pointer}
.lesson-item.unlocked:hover{background:rgba(255,255,255,0.025)}
.lesson-item a{display:contents}
.lesson-num{font-family:var(--mono);font-size:11px;color:var(--text-3);letter-spacing:0.08em;flex:none;width:28px}
.lesson-title{flex:1;font-size:15px;font-weight:500;color:var(--text);letter-spacing:-0.01em}
.lesson-item.locked .lesson-title{color:var(--text-2)}
.lesson-dur{font-family:var(--mono);font-size:11px;color:var(--text-3);flex:none}
.lesson-icon{font-size:14px;flex:none;width:20px;text-align:center}

/* Enrolled banner */
.enrolled-banner{
  display:none;align-items:center;gap:12px;
  padding:14px 20px;border-radius:10px;margin-bottom:24px;
  border:1px solid oklch(0.80 0.17 155 / 0.4);
  background:oklch(0.80 0.17 155 / 0.07);
  font-size:14px;color:var(--text-2);
}
.enrolled-banner.show{display:flex}
.enrolled-banner strong{color:var(--text)}
.enrolled-banner .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);flex:none;box-shadow:0 0 0 3px var(--accent-dim)}

/* ─── Enroll Modal ─── */
.modal-overlay{
  position:fixed;inset:0;z-index:200;
  background:rgba(10,11,13,0.82);
  backdrop-filter:blur(10px);
  display:none;place-items:center;
  padding:20px;
}
.modal-overlay.open{display:grid}
.modal{
  background:var(--surface);
  border:1px solid var(--border-2);
  border-radius:20px;
  padding:40px;
  width:100%;max-width:460px;
  position:relative;
  box-shadow:0 24px 80px rgba(0,0,0,0.6);
}
.modal-close{
  position:absolute;top:16px;right:16px;
  width:32px;height:32px;border-radius:50%;border:1px solid var(--border);
  background:transparent;cursor:pointer;
  display:grid;place-items:center;color:var(--text-3);
  font-size:16px;transition:color .15s,background .15s;
}
.modal-close:hover{color:var(--text);background:var(--hair)}
.modal h2{font-size:22px;font-weight:500;letter-spacing:-0.02em;margin:0 0 6px}
.modal .modal-sub{font-size:14px;color:var(--text-3);margin:0 0 28px}
.field{margin-bottom:18px}
.field label{display:block;font-family:var(--mono);font-size:10.5px;letter-spacing:0.12em;text-transform:uppercase;color:var(--text-3);margin-bottom:8px}
.field input,.field select{
  width:100%;padding:12px 14px;
  background:var(--elev);border:1px solid var(--border);border-radius:10px;
  color:var(--text);font-family:var(--sans);font-size:15px;
  outline:none;transition:border-color .18s;
  -webkit-appearance:none;
}
.field input::placeholder{color:var(--text-3)}
.field input:focus,.field select:focus{border-color:var(--accent)}
.field select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237E8694' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:36px;cursor:pointer}
.field select option{background:var(--elev)}
.modal-submit{
  width:100%;padding:14px;border-radius:10px;
  background:var(--accent);color:#04140B;
  font-family:var(--sans);font-weight:500;font-size:15px;
  border:none;cursor:pointer;
  transition:opacity .18s,transform .12s;
  margin-top:6px;
}
.modal-submit:hover{opacity:0.88;transform:translateY(-1px)}
.modal-submit:disabled{opacity:0.5;cursor:not-allowed;transform:none}
.modal-note{font-family:var(--mono);font-size:10.5px;color:var(--text-3);text-align:center;margin-top:14px;letter-spacing:0.04em}
.modal-error{display:none;font-size:13px;color:#f87171;margin-top:8px;padding:10px 14px;border-radius:8px;background:rgba(248,113,113,0.08);border:1px solid rgba(248,113,113,0.2)}
.modal-error.show{display:block}

/* Footer */
footer{padding:32px 0 48px}
.foot{display:flex;justify-content:space-between;align-items:center;font-family:var(--mono);font-size:11.5px;color:var(--text-3);letter-spacing:0.06em;text-transform:uppercase;border-top:1px solid var(--border);padding-top:24px}

@media(max-width:680px){
  .modal{padding:28px 22px}
  .lessons-header{flex-direction:column;align-items:flex-start}
  .unlock-btn{width:100%;justify-content:center}
  .lesson-item{padding:14px 16px;gap:12px}
}