:root{
  --bg:#f6f5f1; --card:#fff; --ink:#1c241c; --muted:#5b6b58;
  --green:#218c3d; --green2:#2fb75a; --gold:#d99a1b; --line:#e4e2d9;
  --danger:#c0392b; --shadow:0 2px 14px rgba(28,36,28,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI',system-ui,-apple-system,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.5}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}

/* TOP NAV */
.topnav{background:rgba(255,255,255,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.topnav .bar{max-width:1000px;margin:0 auto;display:flex;align-items:center;gap:1rem;padding:.7rem 1rem;flex-wrap:wrap}
.brand{font-weight:800;font-size:1.15rem;color:var(--ink);display:flex;align-items:center;gap:.45rem}
.brand b{color:var(--green)}
.brand .brand-ico{display:inline-flex;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--green),var(--green2));align-items:center;justify-content:center;font-size:1.15rem;box-shadow:0 3px 10px rgba(33,140,61,.3)}
.brand:hover{text-decoration:none}
.menu{display:flex;align-items:center;gap:.6rem;margin-left:auto;flex-wrap:wrap}
.menu a{color:var(--ink);font-size:.9rem;font-weight:600;padding:.35rem .5rem;border-radius:8px;transition:background .2s,color .2s}
.menu a:hover{background:#eef7ef;color:var(--green);text-decoration:none}
.menu a.muted-link{color:var(--muted);font-weight:600}
.menu a.hl{background:var(--green);color:#fff;padding:.45rem .95rem;border-radius:50px;font-weight:700}
.menu a.hl:hover{background:var(--green2)}
.menu .sep{width:1px;height:22px;background:var(--line);margin:0 .2rem}
.pill{font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.04em;padding:.18rem .5rem;border-radius:50px;
  background:#eef7ef;color:var(--green)}

/* FLASH */
.flash-stack{max-width:1000px;margin:1rem auto;padding:0 1rem}
.flash{padding:.8rem 1rem;border-radius:12px;margin-bottom:.5rem;font-size:.92rem;border:1px solid}
.flash-success{background:#e8f7ec;color:#126b2c;border-color:#bfe8cb}
.flash-error{background:#fbefee;color:#a02020;border-color:#f0c8c4}

/* LAYOUT */
.wrap{max-width:1000px;margin:0 auto;padding:1.5rem 1rem}
.hero{max-width:1000px;margin:0 auto;padding:3rem 1rem 2rem;text-align:center}
.hero h1{font-size:clamp(1.9rem,5.5vw,3rem);font-weight:900}
.hero h1 em{color:var(--green);font-style:normal}
.hero p{color:var(--muted);max-width:600px;margin:.8rem auto 0;font-size:1.05rem}
.cta-row{display:flex;gap:.8rem;justify-content:center;margin-top:1.6rem;flex-wrap:wrap}

.btn{display:inline-block;padding:.7rem 1.4rem;border-radius:50px;font-weight:700;font-size:.95rem;cursor:pointer;border:none;transition:transform .2s,background .2s}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-green{background:var(--green);color:#fff}.btn-green:hover{background:var(--green2)}
.btn-out{background:#fff;color:var(--ink);border:1.5px solid var(--line)}.btn-out:hover{background:#f0efe9}

h1.page-title{font-size:1.6rem;font-weight:800;margin-bottom:.2rem}
.muted{color:var(--muted)}
.eyebrow{color:var(--green);font-weight:800;text-transform:uppercase;letter-spacing:.1em;font-size:.78rem}

/* CARDS */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1.2rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:1.4rem;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 6px 22px rgba(28,36,28,.12)}
.card .emoji{font-size:2.2rem;line-height:1}
.card h3{font-size:1.1rem;margin:.5rem 0 .3rem}
.card p{color:var(--muted);font-size:.9rem}
.card .tags{display:flex;gap:.4rem;margin-top:.7rem;flex-wrap:wrap}
.tag{font-size:.7rem;font-weight:700;background:#eef7ef;color:var(--green);padding:.2rem .55rem;border-radius:50px}
.tag.gold{background:#fdf3df;color:var(--gold)}
.tag.grey{background:#eeece4;color:#667;}

.hero-card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:2rem;box-shadow:var(--shadow)}
.section-title{font-size:1.3rem;font-weight:800;margin:2rem 0 1rem}

/* COURSE DETAIL */
.course-head{display:flex;gap:1.2rem;align-items:flex-start;flex-wrap:wrap}
.course-head .big-emoji{font-size:3.6rem;line-height:1}
.course-head .info{flex:1;min-width:220px}
.meta{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.7rem}
.lessons{margin-top:1.5rem;display:grid;gap:.7rem}
.lesson{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1rem 1.2rem;display:flex;gap:1rem;align-items:flex-start}
.lesson .num{width:34px;height:34px;border-radius:50%;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;flex-shrink:0}
.lesson .num.grey{background:#c5cdc3}
.lesson h4{font-size:1rem}
.lesson .desc{color:var(--muted);font-size:.88rem;margin-top:.2rem}
.lesson video{width:100%;border-radius:10px;margin-top:.6rem}
.progress-bar{height:8px;background:#e7e5dc;border-radius:50px;overflow:hidden;margin-top:.6rem}
.progress-bar>div{height:100%;background:linear-gradient(90deg,var(--green),var(--green2));border-radius:50px}

/* FORMS */
.form-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:1.6rem;box-shadow:var(--shadow);max-width:560px}
.field{margin-bottom:1rem}
.field label{display:block;font-weight:700;font-size:.88rem;margin-bottom:.35rem}
.field input,.field select,.field textarea{width:100%;padding:.7rem .8rem;border:1.5px solid var(--line);border-radius:10px;font-size:.95rem;font-family:inherit}
.field textarea{min-height:110px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--green)}

.role-row{display:flex;gap:.6rem;margin:1rem 0;flex-wrap:wrap}
.role-opt{flex:1;min-width:110px;text-align:center;padding:.8rem .6rem;border:1.5px solid var(--line);border-radius:12px;cursor:pointer;font-size:.82rem;font-weight:700;background:#fff}
.role-opt.active{border-color:var(--green);background:#eef7ef;color:var(--green)}

/* TABLES */
table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
th,td{text-align:left;padding:.7rem .9rem;font-size:.88rem;border-bottom:1px solid var(--line)}
th{background:#f2f1ea;font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;color:#566}
tr:last-child td{border-bottom:none}

.actions{display:flex;gap:.4rem;flex-wrap:wrap}
.btn-sm{padding:.35rem .7rem;font-size:.78rem;border-radius:8px}
.btn-danger{background:#fbefee;color:var(--danger);border:1px solid #f0c8c4}

.empty{background:var(--card);border:1px dashed var(--line);border-radius:16px;padding:2.4rem;text-align:center;color:var(--muted)}

footer{border-top:1px solid var(--line);margin-top:3rem;padding:1.8rem 1rem;text-align:center;color:var(--muted);font-size:.85rem}

@media(max-width:560px){
  .course-head .big-emoji{font-size:2.8rem}
  .menu{gap:.6rem}
}

/* ===== COMMAND CENTER (instructor/admin dashboard) ===== */
.cmd-wrap{max-width:1100px;margin:0 auto;padding:1.5rem 1rem}
.cmd-head{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;flex-wrap:wrap;margin-bottom:1.2rem}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(165px,1fr));gap:1rem;margin-bottom:1.4rem}
.kpi{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:1.1rem 1.2rem;box-shadow:var(--shadow)}
.kpi-ico{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.3rem;margin-bottom:.6rem}
.kpi-num{font-size:1.55rem;font-weight:900;line-height:1;color:var(--ink)}
.kpi-sub{font-size:.85rem;font-weight:800;color:var(--muted)}
.kpi-label{color:var(--muted);font-size:.78rem;margin-top:.3rem}
.new-dot{color:#e6452f}
.cmd-cols{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem;margin-top:1.2rem}
.cmd-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:1.2rem 1.3rem;box-shadow:var(--shadow)}
.cmd-card-head{display:flex;justify-content:space-between;align-items:center;gap:.6rem;flex-wrap:wrap;margin-bottom:.8rem}
.cmd-card-head h3{margin:0;font-size:1.05rem}
.seg-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.seg{border:1px solid var(--line);border-radius:14px;padding:.9rem 1rem}
.seg-title{font-weight:800;font-size:.82rem;text-transform:uppercase;letter-spacing:.05em}
.seg-beginner .seg-title{color:var(--green)}
.seg-exp .seg-title{color:var(--gold)}
.seg-count{float:right;font-weight:900;color:var(--muted);font-size:.9rem}
.seg-item{display:flex;align-items:center;gap:.45rem;font-size:.85rem;margin-top:.55rem;color:var(--ink)}
.seg-item .dot{width:8px;height:8px;border-radius:50%;flex:none}
.seg-empty{color:var(--muted);font-size:.82rem;margin-top:.6rem}
.course-row{display:flex;align-items:center;gap:.8rem;padding:.55rem 0;border-bottom:1px solid var(--line);font-size:.9rem}
.course-row:last-child{border-bottom:none}
.quick-actions{display:flex;gap:.6rem;flex-wrap:wrap}

/* night theme for command center */
html[data-theme="night"] .kpi-ico,html[data-theme="night"] .seg-item,.course-row{color:var(--ink)}
html[data-theme="night"] .seg{border-color:var(--line)}
html[data-theme="night"] .seg-item{border-color:var(--line)}

@media(max-width:760px){
  .cmd-cols{grid-template-columns:1fr}
  .seg-row{grid-template-columns:1fr}
}

/* ===== NIGHT THEME — whole UI shifts, driven by data-theme on <html> ===== */
html[data-theme="night"]{
  --bg:#0d1524; --card:#161f31; --ink:#e9edf4; --muted:#98a6bc;
  --green:#3ecf6a; --green2:#54e07f; --gold:#f0b84a; --line:#27354c;
  --danger:#ef6a63; --shadow:0 2px 16px rgba(0,0,0,.45);
}
html[data-theme="night"] .topnav{background:rgba(13,21,36,.9)}
html[data-theme="night"] .menu a:hover{background:#1c2a44;color:var(--green)}
html[data-theme="night"] .pill{background:#123824;color:var(--green2)}
html[data-theme="night"] .flash-success{background:#0f2a1a;color:#5fe08a;border-color:#1c4a2f}
html[data-theme="night"] .flash-error{background:#301512;color:#ff9b95;border-color:#5a2923}
html[data-theme="night"] .btn-out{background:var(--card);border-color:var(--line)}
html[data-theme="night"] .btn-out:hover{background:#1c2a44}
html[data-theme="night"] .field input,.field select,.field textarea{background:var(--card);color:var(--ink);border-color:var(--line)}
html[data-theme="night"] .role-opt{background:var(--card)}
html[data-theme="night"] .tag{background:#123824;color:var(--green2)}
html[data-theme="night"] .tag.gold{background:#332a10;color:var(--gold)}
html[data-theme="night"] .tag.grey{background:#20283a;color:#94a0b4}
html[data-theme="night"] th{background:#1a2440;color:#b3c0d6}
html[data-theme="night"] td{color:var(--ink)}
html[data-theme="night"] th,html[data-theme="night"] td,html[data-theme="night"] table{border-color:var(--line)}
html[data-theme="night"] .crew-avatar{background:#12311f;border-color:var(--line)}
html[data-theme="night"] .crew-hero{background:linear-gradient(180deg,#13202f,var(--bg))}
html[data-theme="night"] .crew-hero h1{color:#dfe9f3}
html[data-theme="night"] .progress-bar{background:#202a3c}
html[data-theme="night"] .lesson .num.grey{background:#39455c}
html[data-theme="night"] .lesson .desc,.card p{color:var(--muted)}
html[data-theme="night"] .hero-copy h1{color:#eaf1e8}
html[data-theme="night"] .hero-copy p{color:#c2ced9}

/* Full-page starfield that only shows at night — whole UI gets stars */
html[data-theme="night"] body::after{
  content:'';position:fixed;inset:0;z-index:999;pointer-events:none;
  background-image:
    radial-gradient(2px 2px at 12% 18%, rgba(255,255,255,.9) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 28% 8%, rgba(255,247,214,.9) 50%, transparent 51%),
    radial-gradient(2px 2px at 42% 26%, rgba(255,255,255,.85) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 55% 12%, rgba(255,247,214,.85) 50%, transparent 51%),
    radial-gradient(2px 2px at 68% 32%, rgba(255,255,255,.9) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 82% 15%, rgba(255,255,255,.8) 50%, transparent 51%),
    radial-gradient(2px 2px at 91% 40%, rgba(255,247,214,.85) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 20% 45%, rgba(255,255,255,.7) 50%, transparent 51%),
    radial-gradient(2px 2px at 76% 55%, rgba(255,255,255,.75) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 8% 62%, rgba(255,255,255,.8) 50%, transparent 51%);
  opacity:.85;animation:starTwinkle 4s ease-in-out infinite}
@keyframes starTwinkle{0%,100%{opacity:.55}50%{opacity:.9}}

.crew-avatar{width:44px;height:44px;border-radius:12px;background:#eef7ef;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex:none}
.crew-hero{background:linear-gradient(180deg,#eef7ef,var(--bg));padding:3.2rem 1.5rem;text-align:center;border-bottom:1px solid var(--line)}
.crew-hero h1{font-size:clamp(1.7rem,4.5vw,2.6rem);margin:.5rem 0;color:#12381f}
.crew-hero p{color:var(--muted);max-width:560px;margin:0 auto 1.2rem}

/* ===== ANIMATED HERO SCENE ===== */
.scene{
  isolation:isolate;
  position:relative;width:100%;min-height:70vh;overflow:hidden;
  background:linear-gradient(180deg,#bde3f7 0%,#d8f0fc 55%,#dff3d2 72%,#bfe3a8 78%,#9cce7f 100%);
  display:flex;align-items:center;justify-content:center;border-radius:0 0 28px 28px;
}
.sky{position:absolute;inset:0;overflow:hidden}
.sun{position:absolute;top:34px;right:9%;width:74px;height:74px;border-radius:50%;
  background:radial-gradient(circle,#fff7c8,#ffd75e);box-shadow:0 0 60px 22px rgba(255,215,95,.55);
  animation:sunDayNight 24s linear infinite}
.moon{position:absolute;top:34px;right:9%;width:64px;height:64px;border-radius:50%;
  background:radial-gradient(circle at 35% 35%,#fdfdfd,#d8dbe0);
  box-shadow:0 0 40px 14px rgba(220,225,235,.5);opacity:0;
  animation:moonDayNight 24s linear infinite}
.moon::after{content:'';position:absolute;left:18%;top:22%;width:26px;height:26px;border-radius:50%;
  background:radial-gradient(circle,#e3e5ea,#c9ccd3)}
@keyframes sunDayNight{
  0%,30%{opacity:1;transform:none}
  40%{opacity:0;transform:translateY(20px) scale(.7)}
  70%{opacity:0}
  85%{opacity:1;transform:none}
  100%{opacity:1}
}
@keyframes moonDayNight{
  0%,35%{opacity:0}
  45%{opacity:1;transform:translateY(24px) scale(.8)}
  70%{opacity:1;transform:none}
  82%{opacity:0}
  100%{opacity:0}
}

/* stars fade in at night */
.stars{position:absolute;inset:0;background-image:
  radial-gradient(2px 2px at 20% 30%, #fff 50%, transparent 51%),
  radial-gradient(2px 2px at 40% 70%, #fff7d6 50%, transparent 51%),
  radial-gradient(1.5px 1.5px at 60% 40%, #fff 50%, transparent 51%),
  radial-gradient(2px 2px at 75% 22%, #fff7d6 50%, transparent 51%),
  radial-gradient(1.5px 1.5px at 88% 55%, #fff 50%, transparent 51%),
  radial-gradient(2px 2px at 30% 12%, #fff 50%, transparent 51%),
  radial-gradient(1.5px 1.5px at 52% 82%, #fff7d6 50%, transparent 51%),
  radial-gradient(2px 2px at 10% 68%, #fff 50%, transparent 51%),
  radial-gradient(1.5px 1.5px at 93% 12%, #fff 50%, transparent 51%);
  opacity:0;z-index:2;animation:starsCycle 24s linear infinite}
@keyframes starsCycle{0%,30%{opacity:0}50%{opacity:.9}80%{opacity:.9}95%{opacity:0}100%{opacity:0}}

/* the day->night tint overlay */
.daynight{position:absolute;inset:0;z-index:4;pointer-events:none;
  background:linear-gradient(180deg,rgba(20,40,90,.82) 0%,rgba(30,55,110,.62) 55%,rgba(10,30,60,.55) 100%);
  animation:nightCycle 24s linear infinite}
@keyframes nightCycle{
  0%,30%{opacity:0}
  42%{opacity:.15}
  50%{opacity:.6}
  60%{opacity:.85}
  72%{opacity:.85}
  80%{opacity:.4}
  90%{opacity:0}
  100%{opacity:0}
}

/* tractor headlights only on at night */
.tractor .head-glow{opacity:0}
.tractor .beam{opacity:0}
@keyframes headLights{
  0%,42%{opacity:0}
  52%{opacity:1}
  74%{opacity:1}
  84%{opacity:0}
  100%{opacity:0}
}
.tractor .head-glow{animation:headLights 24s linear infinite}
.tractor .beam{animation:headLights 24s linear infinite;mix-blend-mode:screen}
.tractor .beam{fill:#fff7c8;opacity:0;animation:beamFlicker 24s linear infinite}
@keyframes beamFlicker{
  0%,42%{opacity:0}
  50%{opacity:.8}
  55%{opacity:.35}
  60%{opacity:.85}
  74%{opacity:.9}
  84%{opacity:0}
  100%{opacity:0}
}
.cloud::before{content:'';position:absolute;width:50%;height:60%;background:inherit;border-radius:50%;left:20%;top:-45%}
.cloud::after{content:'';position:absolute;width:40%;height:50%;background:inherit;border-radius:50%;right:15%;top:-32%}
.c1{top:46px;left:-140px;width:120px;height:34px;animation-duration:60s}
.c2{top:116px;left:-180px;width:86px;height:26px;opacity:.75;animation-duration:80s;animation-delay:-20s}
.c3{top:76px;right:-160px;width:150px;height:40px;animation-duration:52s;animation-direction:reverse}
@keyframes drift{from{transform:translateX(0)}to{transform:translateX(calc(100vw + 320px))}}

.hills{position:absolute;inset:0}
.hill{position:absolute;border-radius:50%;background:rgba(120,180,90,.35)}
.h1{width:420px;height:180px;left:-90px;bottom:-70px}
.h2{width:560px;height:210px;right:-140px;bottom:-80px;background:rgba(140,195,105,.30)}

/* moving tractors — above the night tint so beams glow */
.tractor-zone{position:absolute;left:0;right:0;z-index:6}
.tz1{bottom:34px}
.tz2{bottom:120px;z-index:5}
.tractor{width:240px;height:auto;will-change:transform}
.tractor svg{width:100%;height:auto;display:block}
.tractor.big{animation:driveAcross 16s linear infinite}
.tractor.small{width:130px;animation:driveAcrossR 22s linear infinite;opacity:.92}
@keyframes driveAcross{
  0%{transform:translateX(-280px)}
  100%{transform:translateX(calc(100vw + 280px))}
}
@keyframes driveAcrossR{
  0%{transform:translateX(calc(100vw + 160px)) scaleX(-1)}
  100%{transform:translateX(-200px) scaleX(-1)}
}
.tractor .wheel.wl,.tractor .wheel.ws{transform-origin:center;animation:spin 1.3s linear infinite}
.tractor.small .wheel{animation-duration:1.1s}
.tractor .puff{opacity:0}
.tractor .p1{animation:puff 1.6s ease-out infinite}
.tractor .p2{animation:puff 1.6s ease-out .8s infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes puff{0%,40%{opacity:0;transform:translate(0,0) scale(.5)}55%{opacity:.5}70%,100%{opacity:0;transform:translate(-14px,-22px) scale(1.3)}}

/* dirt strip tractors roll on — keep above night tint */
.dirt{position:absolute;bottom:0;left:0;right:0;height:30px;
  background:linear-gradient(180deg,#a98c54,#8a6f40);border-radius:20px 20px 28px 28px;z-index:7}

/* hero copy on top */
.hero-copy{position:relative;z-index:5;text-align:center;padding:7rem 1rem 6.5rem;max-width:680px}
.hero-copy h1{font-size:clamp(1.9rem,5.5vw,3.1rem);font-weight:900;color:#12381f;line-height:1.08;margin:.6rem 0}
.hero-copy h1 em{color:var(--green2);font-style:normal;position:relative}
.hero-copy p{color:#3c5a44;max-width:580px;margin:.4rem auto 0;font-size:1.02rem}
.hero-copy .eyebrow{color:#5c8a2f}

.catalog-title{display:flex;align-items:baseline;gap:1rem;margin-bottom:1rem;flex-wrap:wrap}
.catalog-title .section-title{margin:0}
.catalog-title .muted{font-size:.85rem}