/* ============================================================
   DR-BIOS ACADEMY — PCB Board Design System
   Unified with dr-bios.com/laptop-repair-course/
   ============================================================ */

/* ---------- Tokens ---------- */
:root{
  --board-0:#050F0C;
  --board-1:#0A1A15;
  --board-2:#0F2A22;
  --board-3:#123A2E;
  --edge:#1C4A3C;
  --edge-hi:#2C7159;
  --silk:#E8F0EB;
  --silk-2:#A2B8AE;
  --silk-3:#6E877D;
  --gold:#F0B429;
  --gold-deep:#B4820F;
  --copper:#C87A45;
  --probe:#FF4D3D;
  --green-ok:#34D399;
  --shadow:0 18px 50px -20px rgba(0,0,0,.7);
  --f-display:"Saira Condensed","Oswald","Arial Narrow",Impact,sans-serif;
  --f-body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  color-scheme:dark;
}

/* ---------- Reset ---------- */
*{box-sizing:border-box}
body{
  margin:0;
  background:var(--board-0);
  color:var(--silk);
  font:15px/1.65 var(--f-body);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* ---------- Header / Nav ---------- */
header{
  position:sticky;top:0;z-index:60;
  min-height:64px;
  display:flex;align-items:center;justify-content:space-between;
  padding:10px max(22px,5vw);
  background:rgba(5,15,12,.92);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--edge);
  box-shadow:0 16px 36px -24px rgba(0,0,0,.95);
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand img{height:42px;width:auto;max-width:200px;object-fit:contain}
.brand span,.brand-academy{
  font-family:var(--f-mono);font-size:.62rem;font-weight:600;
  color:var(--silk-3);letter-spacing:.18em;text-transform:uppercase;
  padding-left:12px;border-left:1px solid var(--edge-hi);
  text-decoration:none;
}
nav{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
nav a,.link{
  font-size:.9rem;font-weight:500;color:var(--silk-2);
  text-decoration:none;background:none;border:0;padding:6px 0;
  position:relative;transition:color .18s;cursor:pointer;
}
nav a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1.5px;
  background:var(--gold);transition:right .25s var(--ease);
}
nav a:hover,.link:hover{color:var(--silk)}
nav a:hover::after{right:0}
nav form{margin:0}
.theme-toggle{
  width:36px;height:36px;border-radius:2px;padding:0;
  background:rgba(240,180,41,.06);color:var(--gold);
  border:1px solid rgba(240,180,41,.25);font-size:16px;
  cursor:pointer;transition:border-color .18s,background .18s;
}
.theme-toggle:hover{border-color:var(--gold);background:rgba(240,180,41,.12)}

/* ---------- Main ---------- */
main{max-width:1200px;margin:auto;padding:clamp(36px,5vw,72px) clamp(20px,5vw,56px) 80px}

/* ---------- Typography ---------- */
.hero{margin-bottom:30px}
.hero h1{
  font-family:var(--f-display);font-size:clamp(2rem,4.5vw,3.6rem);
  font-weight:700;line-height:1.05;margin:.08em 0 .18em;letter-spacing:-.02em;
}
.hero h1 span{color:var(--gold)}
.hero p{color:var(--silk-2);max-width:720px;font-size:1.02rem}
.eyebrow{
  font-family:var(--f-mono);font-size:.68rem;font-weight:600;
  letter-spacing:.15em;color:var(--gold);text-transform:uppercase;
  margin-bottom:4px;
}
h1,h2,h3,h4{
  font-family:var(--f-display);font-weight:700;line-height:1.08;
  letter-spacing:-.01em;margin:0 0 .5em;
}
h2{font-size:clamp(1.5rem,3vw,2.2rem)}
h3{font-size:clamp(1.15rem,2vw,1.5rem);font-weight:600}
small{display:block;color:var(--silk-3);font-size:.82rem}

/* ---------- Panel ---------- */
.panel{
  background:linear-gradient(160deg,var(--board-2),var(--board-1));
  border:1px solid var(--edge);border-radius:3px;
  padding:24px;box-shadow:var(--shadow);
}

/* ---------- Forms ---------- */
form{display:grid;gap:14px}
label{display:grid;gap:5px;font-family:var(--f-mono);font-size:.72rem;font-weight:600;letter-spacing:.05em;color:var(--silk-3)}
input,textarea,select{
  width:100%;background:var(--board-0);color:var(--silk);
  border:1px solid var(--edge);border-radius:2px;
  padding:11px 13px;font:inherit;font-family:var(--f-body);font-size:.95rem;
  outline:0;transition:border-color .18s,box-shadow .18s;
}
input:focus,textarea:focus,select:focus{
  border-color:var(--gold);box-shadow:0 0 0 3px rgba(240,180,41,.12);
}
textarea{min-height:100px;resize:vertical}
select{cursor:pointer}
select option{background:var(--board-1);color:var(--silk)}

button,.button{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  background:var(--gold);color:#241A00;border:0;border-radius:2px;
  padding:11px 17px;font-family:var(--f-display);font-weight:700;font-size:1rem;
  letter-spacing:.01em;text-decoration:none;cursor:pointer;
  box-shadow:0 0 0 1px rgba(240,180,41,.35),0 10px 34px -14px rgba(240,180,41,.6);
  transition:background .15s,transform .15s var(--ease);
}
button:hover,.button:hover{background:#FFC63F;transform:translateY(-1px)}
button:active,.button:active{transform:translateY(0)}

.secondary{
  background:transparent;border:1px solid var(--edge-hi);
  color:var(--silk);box-shadow:none;
}
.secondary:hover{border-color:var(--gold);color:var(--gold);background:rgba(240,180,41,.04)}

.danger{background:var(--probe);color:#fff;box-shadow:none}
.danger:hover{background:#FF6B5D}

.password-wrap{position:relative}
.password-wrap input{padding-right:48px}
.eye{
  position:absolute;right:4px;top:4px;width:36px;height:34px;padding:0;
  background:transparent;color:var(--silk-3);box-shadow:none;border:0;
  display:grid;place-items:center;cursor:pointer;
}
.eye:hover{color:var(--gold)}

/* ---------- Stats ---------- */
.stats{display:grid;grid-template-columns:repeat(6,1fr);gap:13px;margin-bottom:24px}
.stats div{
  background:var(--board-2);border:1px solid var(--edge);
  border-top:3px solid var(--gold);padding:18px;border-radius:3px;
  box-shadow:var(--shadow);
}
.stats div:nth-child(2n){border-top-color:var(--copper)}
.stats div.revenue{border-top-color:var(--gold)}
.stats b{display:block;font-family:var(--f-mono);font-size:24px;font-variant-numeric:tabular-nums;color:var(--silk)}
.stats span{display:block;color:var(--silk-3);font-size:.82rem}

/* ---------- Layout utilities ---------- */
.section-title,.row,.danger-row,.card-meta{display:flex;align-items:center;justify-content:space-between;gap:12px}
.grid{display:grid;grid-template-columns:370px 1fr;gap:24px}
.admin-grid aside{display:grid;gap:22px;align-content:start}
.wide{min-width:0}
.dashboard-grid{grid-template-columns:.75fr 1.25fr;margin-top:24px}
.course-admin,.student-row{margin-bottom:18px}
.student-row h3{margin:0;font-size:1.15rem}
.student-progress-row{margin:6px 0 2px}
.student-progress-bar{margin:0 0 4px;height:6px;background:var(--board-2)}
.student-progress-label{color:var(--silk-3);font-size:.78rem}
.assign-panel{border-top:3px solid var(--copper)}

/* ---------- Table ---------- */
table{border-collapse:collapse;width:100%}
th,td{text-align:left;padding:13px;border-bottom:1px solid var(--edge)}
th{font-family:var(--f-mono);color:var(--silk-3);font-size:.68rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase}
td form{display:block}

/* ---------- Badges ---------- */
.badge,.chip{
  display:inline-block;padding:5px 10px;border-radius:2px;
  font-family:var(--f-mono);font-size:.72rem;font-weight:700;letter-spacing:.05em;
  background:rgba(52,211,153,.10);color:var(--green-ok);
  border:1px solid rgba(52,211,153,.25);
}
.badge.off{background:rgba(255,77,61,.08);color:var(--probe);border-color:rgba(255,77,61,.25)}
.chip{border:1px solid currentColor}

/* ---------- Danger row ---------- */
.danger-row{justify-content:flex-start;margin-top:14px;gap:8px}
.danger-row form{display:block}

/* ---------- Form layout ---------- */
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.check{display:flex;align-items:center;gap:8px}
.check input{width:auto;accent-color:var(--gold)}

/* ---------- Notices ---------- */
.notice,.error,.credentials{padding:16px 20px;border-radius:3px;margin-bottom:20px;font-size:.92rem}
.notice,.credentials{background:rgba(52,211,153,.08);border:1px solid rgba(52,211,153,.3);color:var(--green-ok)}
.error{background:rgba(255,77,61,.06);border:1px solid rgba(255,77,61,.2);color:var(--probe)}
.credentials code{display:block;font-family:var(--f-mono);font-size:1.05rem;margin:8px 0;color:var(--gold)}

/* ---------- Course cards ---------- */
.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.course-card{
  display:flex;gap:17px;background:var(--board-2);
  border:1px solid var(--edge);border-radius:3px;
  padding:22px;text-decoration:none;color:inherit;
  box-shadow:var(--shadow);transition:.2s;
}
.course-card:hover{border-color:var(--gold);transform:translateY(-3px)}
.course-card>div:last-child{flex:1}
.course-icon{
  width:48px;height:48px;flex:0 0 48px;border-radius:3px;
  background:linear-gradient(145deg,rgba(240,180,41,.18),rgba(240,180,41,.06));
  border:1px solid rgba(240,180,41,.30);
  color:var(--gold);display:grid;place-items:center;
  font-family:var(--f-display);font-weight:900;
}
.progress{height:5px;border-radius:2px;background:var(--edge);overflow:hidden;margin:18px 0 6px}
.progress i{height:100%;display:block;background:linear-gradient(90deg,var(--gold-deep),var(--gold),var(--copper));border-radius:2px}

/* ---------- Lesson list ---------- */
.lesson-list a{
  display:flex;align-items:center;gap:20px;padding:18px;
  color:inherit;text-decoration:none;border-bottom:1px solid var(--edge);
  transition:background .15s,padding .15s;
}
.lesson-list a:hover{background:rgba(240,180,41,.03);padding-left:24px}
.lesson-list a>span,.lesson-admin-list summary>span{
  color:var(--gold);font:800 16px var(--f-mono);
}
.lesson-list a>div{flex:1}
.lesson-list em{font-style:normal;color:var(--silk-3);font-family:var(--f-mono);font-size:.82rem}

/* ---------- Player ---------- */
.player{
  aspect-ratio:16/9;background:#020705;border:1px solid var(--edge);
  border-radius:3px;overflow:hidden;margin-bottom:20px;box-shadow:var(--shadow);
}
.player iframe{width:100%;height:100%;border:0}
.player-empty{height:100%;display:grid;place-content:center;text-align:center;color:var(--silk-3)}
.player-empty b{color:var(--silk);font-size:1.15rem}
.lesson-notes{border-left:3px solid var(--copper)}
.prose{white-space:normal;margin-bottom:20px;color:var(--silk-2)}
.text-link{color:var(--gold);font-weight:700;text-decoration:none;font-family:var(--f-mono);font-size:.88rem}
.text-link:hover{text-decoration:underline}
dl{display:grid;grid-template-columns:120px 1fr}
dt{color:var(--silk-3);font-family:var(--f-mono);font-size:.78rem;letter-spacing:.04em}
dd{margin:0 0 12px}

/* ---------- Details / Accordion ---------- */
details{border-top:1px solid var(--edge);margin-top:17px;padding-top:12px}
summary{cursor:pointer;color:var(--gold);font-family:var(--f-display);font-weight:700;list-style:none}
summary::-webkit-details-marker{display:none}
details>form{margin-top:16px}
.lesson-admin-list details:not(.ls-row__detail){background:var(--board-1);padding:13px 15px;border:1px solid var(--edge);border-radius:3px}
.lesson-admin-list summary:not(.ls-row__detail>summary){display:grid;grid-template-columns:36px 1fr auto;align-items:center;gap:10px;color:var(--silk)}
.ls-row__detail{border-top:0;margin-top:0;padding-top:0;}
.ls-row__detail>summary{color:var(--silk);font-family:var(--f-body,sans-serif);font-weight:400;}
.ls-row__detail>form{margin-top:0;}
.add-lesson{border:1px dashed var(--edge-hi);padding:14px;border-radius:3px}

/* ---------- Chart ---------- */
.chart-panel{margin-bottom:24px}
.chart{display:block;width:100%;height:290px;margin-top:16px}
.filters{display:flex;gap:4px;background:var(--board-1);padding:3px;border-radius:2px;border:1px solid var(--edge)}
.filters a{padding:7px 12px;border-radius:2px;color:var(--silk-3);text-decoration:none;font-family:var(--f-mono);font-weight:700;font-size:.78rem;letter-spacing:.04em;transition:background .15s,color .15s}
.filters a:hover{color:var(--silk)}
.filters a.active{background:var(--gold);color:#241A00}
.filters a::after{display:none}
.search{display:flex;margin-bottom:16px}
.search input{flex:1;border-radius:2px 0 0 2px}
.search button{border-radius:0 2px 2px 0}

/* ---------- Page head ---------- */
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:25px}
.page-head h1{margin:0;font-size:clamp(1.8rem,4vw,2.8rem)}
.page-actions{display:flex;gap:9px;flex-wrap:wrap}
.page-actions .active{background:var(--gold);color:#241A00;border-color:transparent}
.form-card{max-width:760px;border-top:3px solid var(--copper)}
.phone-row{display:grid;grid-template-columns:150px 1fr;gap:10px}
.quick-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:14px 0}
.quick-actions form{display:block}
.course-list{display:grid;gap:18px}
.course-admin h2{margin:.15em 0}
.table-wrap{overflow-x:auto}

/* ---------- Unified create form ---------- */
.unified-create{max-width:900px}
.form-section{padding:4px 0 22px}
.purchase-section{border-top:1px solid var(--edge);padding-top:25px}
.primary-wide{width:100%;font-size:1rem}
.form-actions{display:flex;gap:10px;flex-wrap:wrap}
.form-actions button{flex:1}

/* ---------- Email dialog ---------- */
.email-dialog{
  width:min(760px,92vw);border:1px solid var(--edge);border-radius:3px;
  background:var(--board-2);color:var(--silk);padding:24px;
  box-shadow:0 25px 80px #0008;
}
.email-dialog::backdrop{background:rgba(5,15,12,.85);backdrop-filter:blur(6px)}
.email-dialog textarea{min-height:330px}

/* ---------- Dashboard ---------- */
.dashboard-hero{display:flex;align-items:flex-end;justify-content:space-between;gap:20px}
.date-filter{position:relative;border:0;margin:0;padding:0}
.date-filter summary{
  background:var(--board-2);border:1px solid var(--edge);border-radius:2px;
  padding:10px 16px;box-shadow:var(--shadow);color:var(--silk-2);
  font-family:var(--f-mono);font-size:.82rem;
}
.date-filter form{
  position:absolute;right:0;top:52px;width:330px;z-index:5;
  background:var(--board-2);border:1px solid var(--edge);border-radius:3px;
  padding:18px;box-shadow:var(--shadow);
}
.compact-stats{grid-template-columns:repeat(2,minmax(220px,320px))}
.chart-legend{display:flex;gap:20px;justify-content:flex-end;color:var(--silk-3);font-family:var(--f-mono);font-size:.72rem;letter-spacing:.04em}
.chart-legend span:before{content:'';display:inline-block;width:24px;height:3px;margin-right:7px;vertical-align:middle;border-radius:2px}
.revenue-key:before{background:var(--gold)}
.students-key:before{background:var(--copper)}

/* ---------- Responsive ---------- */
@media(max-width:1000px){
  .stats{grid-template-columns:repeat(3,1fr)}
  .course-grid{grid-template-columns:repeat(2,1fr)}
  .grid,.login,.dashboard-grid{grid-template-columns:1fr}
  nav{gap:11px;font-size:.82rem}
  .brand img{width:130px}
  .brand span,.brand-academy{font-size:.56rem}
}
@media(max-width:640px){
  header{align-items:flex-start;position:relative;flex-wrap:wrap}
  .brand span,.brand-academy{display:none}
  nav{width:100%;overflow-x:auto;flex-wrap:nowrap;gap:12px}
  nav a::after{display:none}
  .stats{grid-template-columns:repeat(2,1fr)}
  .course-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .section-title{align-items:flex-start;flex-wrap:wrap}
  .panel{padding:18px}
  .lesson-admin-list summary{grid-template-columns:30px 1fr}
  .lesson-admin-list summary small{grid-column:2}
  .chart{height:230px}
  .phone-row{grid-template-columns:1fr}
  .page-head{align-items:flex-start;flex-wrap:wrap}
  .dashboard-hero{align-items:flex-start;flex-direction:column}
  .date-filter form{left:0;right:auto;width:min(330px,85vw)}
  .compact-stats{grid-template-columns:1fr}
}

/* ---------- Focus ---------- */
a:focus-visible,button:focus-visible,summary:focus-visible,[tabindex]:focus-visible{
  outline:2px solid var(--gold);outline-offset:3px;border-radius:2px;
}

/* ---------- Pagination ---------- */
nav[role="navigation"]{display:flex;gap:4px;margin-top:20px;flex-wrap:wrap}
nav[role="navigation"] a,nav[role="navigation"] span{
  padding:6px 12px;border:1px solid var(--edge);border-radius:2px;
  font-family:var(--f-mono);font-size:.78rem;color:var(--silk-3);
}
nav[role="navigation"] span[aria-current]{background:var(--gold);color:#241A00;border-color:var(--gold)}
nav[role="navigation"] a:hover{border-color:var(--gold);color:var(--gold)}
nav[role="navigation"] a::after{display:none}