/* ============================================================
   TrainingBits · SkillSync — modern UI system
   ============================================================ */
:root{
  /* brand */
  --green:#16a34a; --green-d:#15803d; --green-dd:#166534;
  --green-l:#ecfdf3; --green-l2:#d1fadf;
  --navy:#0f172a; --ink:#1e293b; --muted:#64748b; --muted-l:#94a3b8;
  /* surfaces */
  --bg:#f4f7f5; --bg2:#eef2f0; --surface:#ffffff; --line:#e6ebe8; --line-2:#eef2f0;
  /* accents */
  --blue:#0ea5e9; --blue-l:#e0f2fe; --blue-d:#0369a1;
  --purple:#7c3aed; --purple-l:#f3e8ff; --purple-d:#6d28d9;
  --amber:#d97706; --amber-l:#fef3c7; --red:#dc2626; --red-l:#fee2e2;
  /* shape + depth */
  --r-xl:20px; --r-lg:16px; --r-md:12px; --r-sm:9px;
  --sh-sm:0 1px 2px rgba(15,23,42,.06),0 1px 3px rgba(15,23,42,.04);
  --sh-md:0 4px 12px rgba(15,23,42,.06),0 2px 4px rgba(15,23,42,.04);
  --sh-lg:0 12px 32px rgba(15,23,42,.10),0 4px 8px rgba(15,23,42,.05);
  --sh-green:0 8px 22px rgba(22,163,74,.28);
  --grad-green:linear-gradient(135deg,#22c55e 0%,#15803d 100%);
  --grad-navy:linear-gradient(150deg,#0b1f3a 0%,#0a1426 60%,#071019 100%);
  --font:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
/* ---------- Dark theme ---------- */
:root[data-theme="dark"]{
  --green:#22c55e; --green-d:#4ade80; --green-dd:#86efac;
  --green-l:#16271c; --green-l2:#1f3a29;
  --navy:#e9efe9; --ink:#d3dbd4; --muted:#8b978c; --muted-l:#6b766d;
  --bg:#0d1411; --bg2:#161e19; --surface:#141c17; --line:#26302a; --line-2:#1d261f;
  --blue-l:#0e2a38; --blue-d:#7dd3fc;
  --purple-l:#2a1d44; --purple-d:#c4b5fd;
  --amber-l:#3a2e10; --red-l:#3a1b1b;
  --sh-sm:0 1px 2px rgba(0,0,0,.4);
  --sh-md:0 4px 12px rgba(0,0,0,.45);
  --sh-lg:0 14px 36px rgba(0,0,0,.55);
  --grad-green:linear-gradient(135deg,#22c55e 0%,#16a34a 100%);
}
:root[data-theme="dark"] body{background:var(--bg)}
:root[data-theme="dark"] .alert.err{color:#fca5a5;border-color:#5b2626}
:root[data-theme="dark"] .alert.ok{color:#86efac}
:root[data-theme="dark"] .badge.red{color:#fca5a5}
:root[data-theme="dark"] .course-card.locked{background:linear-gradient(180deg,#131a16,#10160f);border-color:#283027}
:root[data-theme="dark"] .course-card.locked .icon{background:#1a2119;border-color:#283027}
:root[data-theme="dark"] .course-card.locked .lock{background:var(--surface)}
:root[data-theme="dark"] select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%238b978c' stroke-width='2'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E")}
:root[data-theme="dark"] input[type=file]{color:var(--ink)}
:root[data-theme="dark"] .stat::after{background:var(--green-l);opacity:.5}

/* brand logo lockup (theme-aware) */
.tb-brand{display:inline-block;line-height:0}
.tb-logo{width:100%;height:auto;display:block}
.tb-logo-dark{display:none}
:root[data-theme="dark"] .tb-logo-light{display:none}
:root[data-theme="dark"] .tb-logo-dark{display:block}

/* theme toggle button */
.theme-toggle{width:38px;height:38px;border-radius:11px;border:1px solid var(--line);background:var(--surface);
  color:var(--muted);cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--sh-sm);
  transition:.15s;flex-shrink:0}
.theme-toggle:hover{background:var(--bg2);color:var(--navy);border-color:#d2dad4}
.theme-toggle svg{width:18px;height:18px}
.theme-toggle .sun{display:none}
:root[data-theme="dark"] .theme-toggle .sun{display:block}
:root[data-theme="dark"] .theme-toggle .moon{display:none}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:var(--font);color:var(--ink);background:var(--bg);font-size:14.5px;line-height:1.55;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--green-d);text-decoration:none;transition:color .15s}
a:hover{color:var(--green-dd)}
h1,h2,h3,h4{color:var(--navy);margin:0 0 .3em;font-weight:700;letter-spacing:-.01em}
h1{font-size:1.55rem} h2{font-size:1.2rem}
.muted{color:var(--muted)} .small{font-size:12.5px}
::selection{background:var(--green-l2)}

/* scrollbars */
*::-webkit-scrollbar{width:10px;height:10px}
*::-webkit-scrollbar-thumb{background:#cdd6d1;border-radius:20px;border:2px solid var(--bg)}
*::-webkit-scrollbar-thumb:hover{background:#b3bfb8}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;gap:.5rem;align-items:center;justify-content:center;border:1px solid transparent;
  border-radius:11px;padding:.62rem 1.05rem;font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;
  background:var(--grad-green);color:#fff;box-shadow:var(--sh-green);transition:transform .12s,box-shadow .15s,filter .15s;white-space:nowrap}
.btn:hover{filter:brightness(1.05);transform:translateY(-1px);color:#fff;text-decoration:none;box-shadow:0 10px 26px rgba(22,163,74,.34)}
.btn:active{transform:translateY(0)}
.btn.block{width:100%}
.btn.ghost{background:var(--surface);color:var(--ink);border-color:var(--line);box-shadow:var(--sh-sm)}
.btn.ghost:hover{background:var(--bg2);border-color:#d6ddd9;filter:none;color:var(--ink)}
.btn.danger{background:linear-gradient(135deg,#ef4444,#dc2626);box-shadow:0 8px 20px rgba(220,38,38,.25)}
.btn.danger:hover{box-shadow:0 10px 24px rgba(220,38,38,.32)}
.btn.sm{padding:.4rem .7rem;font-size:12.5px;border-radius:9px;box-shadow:none}
.btn.sm:hover{transform:none;box-shadow:none}
.btn.sm.ghost:hover{background:var(--bg2)}
summary{list-style:none;cursor:pointer}
summary::-webkit-details-marker{display:none}
summary::marker{content:""}

/* ---------- Forms ---------- */
label{display:block;font-weight:600;color:var(--navy);margin:.85rem 0 .35rem;font-size:13px}
input,select,textarea{width:100%;padding:.68rem .85rem;border:1px solid var(--line);border-radius:11px;font-size:14px;
  background:var(--surface);color:var(--ink);font-family:inherit;transition:border-color .15s,box-shadow .15s}
input::placeholder,textarea::placeholder{color:var(--muted-l)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px var(--green-l2)}
textarea{min-height:92px;resize:vertical}
select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .8rem center;padding-right:2rem}
.field-row{display:flex;gap:.7rem;flex-wrap:wrap}
.field-row .field{flex:1;min-width:120px}
.check{display:flex;align-items:center;gap:.5rem;font-weight:500;color:var(--ink)}
.check input{width:auto;box-shadow:none}
input[type=checkbox],input[type=radio]{accent-color:var(--green)}
input[type=color]{padding:.2rem;height:42px;cursor:pointer}
input[type=file]{padding:.5rem;background:var(--bg2);cursor:pointer}

/* ---------- Alerts ---------- */
.alert{padding:.75rem 1rem;border-radius:12px;margin-bottom:1.1rem;font-size:13.5px;font-weight:500;
  display:flex;align-items:center;gap:.5rem;border:1px solid transparent}
.alert::before{font-size:1rem}
.alert.ok{background:var(--green-l);color:var(--green-dd);border-color:var(--green-l2)}
.alert.ok::before{content:"✓"}
.alert.err{background:var(--red-l);color:#b91c1c;border-color:#fecaca}
.alert.err::before{content:"⚠"}

/* ============================================================
   LOGIN — minimalist, image on the LEFT
   ============================================================ */
.login{display:grid;grid-template-columns:1.1fr 1fr;height:100vh;height:100dvh;overflow:hidden;background:var(--surface)}
/* left: image */
.login-media{position:relative;overflow:hidden;display:flex;align-items:flex-end;padding:3.2rem;color:#fff;
  background:var(--grad-navy) center/cover no-repeat;background-image:url("/assets/img/login.png")}
.login-media::before{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(7,16,25,.10) 0%,rgba(7,16,25,.35) 55%,rgba(7,16,25,.9) 100%),
             radial-gradient(700px 480px at 18% 92%,rgba(22,163,74,.30),transparent 60%)}
.login-media-tag{position:relative;font-size:2.6rem;font-weight:800;line-height:1.08;letter-spacing:-.02em;text-shadow:0 2px 24px rgba(0,0,0,.55)}
.login-media-tag .s{color:#4ade80}
/* right: form, centered + minimal */
.login-form{position:relative;display:flex;align-items:center;justify-content:center;padding:2rem;overflow-y:auto}
.login-card{width:100%;max-width:360px}
.login-card .brand{margin-bottom:1.6rem}
.login-card .brand .logo{width:42px;height:42px;border-radius:12px;background:var(--grad-green);
  box-shadow:var(--sh-green);display:flex;align-items:center;justify-content:center}
.login-card .brand b{font-size:1.3rem;color:var(--navy)}
.login-card .brand b span{color:var(--green)}
.login-card h1{font-size:1.7rem;letter-spacing:-.02em;margin:0}
.login-card form label:first-of-type{margin-top:0}
/* "or" divider */
.or-divider{display:flex;align-items:center;gap:.8rem;margin:1.2rem 0;color:var(--muted-l);font-size:12.5px}
.or-divider::before,.or-divider::after{content:"";flex:1;height:1px;background:var(--line)}
/* Google button */
.btn-google{display:flex;align-items:center;justify-content:center;gap:.7rem;width:100%;padding:.65rem 1rem;
  border:1px solid var(--line);border-radius:11px;background:var(--surface);color:var(--ink);font-weight:600;
  font-size:14px;box-shadow:var(--sh-sm);transition:.15s}
.btn-google:hover{background:var(--bg2);border-color:#d2dad4;text-decoration:none;color:var(--ink)}

/* ============================================================
   APP SHELL
   ============================================================ */
.shell{display:grid;grid-template-columns:264px 1fr;min-height:100vh}
.side{background:var(--surface);border-right:1px solid var(--line);padding:1.1rem .85rem;position:sticky;top:0;
  height:100vh;display:flex;flex-direction:column;gap:.15rem}
.side .brand{margin:.4rem .5rem 1.3rem;gap:.6rem}
.side-brand{margin:.5rem .6rem 1.2rem}
.side .brand .logo{width:38px;height:38px;border-radius:11px}
.side .brand b{font-size:1.15rem}
.nav-label{font-size:10.5px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--muted-l);
  padding:.5rem .85rem .3rem}
.nav a{display:flex;align-items:center;gap:.7rem;padding:.6rem .85rem;border-radius:11px;color:var(--ink);
  font-weight:500;font-size:14px;margin-bottom:1px;position:relative;transition:background .14s,color .14s}
.nav a .i{width:20px;text-align:center;font-size:1.05rem;filter:grayscale(.2);transition:.14s}
.nav a:hover{background:var(--bg2);color:var(--navy);text-decoration:none}
.nav a.on{background:var(--green-l);color:var(--green-dd);font-weight:700}
.nav a.on .i{filter:none}
.nav a.on::before{content:"";position:absolute;left:-.85rem;top:50%;transform:translateY(-50%);
  width:4px;height:22px;border-radius:0 4px 4px 0;background:var(--green)}
.nav .sep{height:1px;background:var(--line);margin:.7rem .6rem}
.side .foot{margin-top:auto}

.main{padding:1.7rem 2.2rem 3rem;max-width:1320px;width:100%}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.6rem;gap:1rem;flex-wrap:wrap}
.topbar h1{font-size:1.55rem;margin:0}
.topbar > div:first-child p{margin:.2rem 0 0}
.who{display:flex;align-items:center;gap:.65rem;font-weight:600;color:var(--navy);font-size:13.5px;
  background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:.4rem .8rem .4rem .5rem;box-shadow:var(--sh-sm)}
.avatar{width:36px;height:36px;border-radius:10px;background:var(--grad-green);display:flex;align-items:center;
  justify-content:center;font-weight:800;color:#fff;font-size:15px;box-shadow:var(--sh-sm)}

/* ---------- Toolbar / search ---------- */
.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.2rem;gap:1rem;flex-wrap:wrap}
.searchbar{max-width:320px;background:var(--surface)}

/* ============================================================
   COURSE CARDS
   ============================================================ */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(248px,1fr));gap:1.2rem}
.course-card{--accent:var(--green);position:relative;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:1.5rem 1.3rem 1.3rem;text-align:center;color:var(--ink);overflow:hidden;
  box-shadow:var(--sh-sm);transition:transform .16s,box-shadow .16s,border-color .16s;display:block}
.course-card::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;
  background:linear-gradient(90deg,var(--accent),color-mix(in srgb,var(--accent) 55%,#fff))}
.course-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:color-mix(in srgb,var(--accent) 35%,var(--line));text-decoration:none;color:var(--ink)}
.course-card .icon{width:62px;height:62px;margin:.4rem auto .7rem;border-radius:16px;display:flex;align-items:center;
  justify-content:center;font-size:1.9rem;background:color-mix(in srgb,var(--accent) 14%,var(--surface));
  border:1px solid color-mix(in srgb,var(--accent) 22%,var(--line))}
.course-thumb{width:100%;height:130px;margin:0 0 .85rem;border-radius:12px;overflow:hidden;background:var(--bg2);
  border:1px solid var(--line)}
.course-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.course-card.locked .course-thumb img{filter:grayscale(1);opacity:.55}
.course-card h3{font-size:1.12rem;margin:.1rem 0 .15rem}
.course-card .code{color:var(--muted);font-size:12.5px;font-weight:500}
.course-card .vendor{font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);font-weight:800}
.progress{height:8px;background:var(--bg2);border-radius:20px;margin-top:1rem;overflow:hidden}
.progress>span{display:block;height:100%;border-radius:20px;background:linear-gradient(90deg,var(--accent),#22c55e);transition:width .4s}
.course-card .badge{margin-top:.9rem}
/* locked / not enrolled */
.course-card.locked{background:linear-gradient(180deg,#fafbfa,#f3f5f4);border-style:dashed;border-color:#dde3e0;
  color:var(--muted);cursor:not-allowed;box-shadow:none}
.course-card.locked::before{background:#d7ddd9}
.course-card.locked:hover{transform:none;box-shadow:none;border-color:#dde3e0}
.course-card.locked .icon{background:#eef1ef;border-color:#e2e7e4}
.course-card.locked h3{color:#8a938c}
.course-card.locked .lock{position:absolute;top:14px;right:14px;width:28px;height:28px;border-radius:8px;
  background:var(--surface);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:.85rem;opacity:.85}

/* ============================================================
   CARDS / STATS / TABLES
   ============================================================ */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:1.4rem;box-shadow:var(--sh-sm)}
.section{margin-bottom:1.9rem}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:1.1rem;margin-bottom:1.7rem}
.stat{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:1.2rem 1.3rem;box-shadow:var(--sh-sm);overflow:hidden;transition:transform .15s,box-shadow .15s}
.stat:hover{transform:translateY(-2px);box-shadow:var(--sh-md)}
.stat::after{content:"";position:absolute;right:-20px;top:-20px;width:70px;height:70px;border-radius:50%;
  background:var(--green-l);opacity:.6}
.stat .n{font-size:2rem;font-weight:800;color:var(--navy);line-height:1;position:relative;letter-spacing:-.02em}
.stat .l{color:var(--muted);font-size:12.5px;margin-top:.35rem;font-weight:500;position:relative}

table{width:100%;border-collapse:separate;border-spacing:0;font-size:13.5px}
th,td{text-align:left;padding:.8rem .75rem;border-bottom:1px solid var(--line-2);vertical-align:middle}
thead th{color:var(--muted);font-weight:600;font-size:11px;text-transform:uppercase;letter-spacing:.05em;
  background:var(--bg);position:sticky;top:0}
thead th:first-child{border-radius:10px 0 0 0}
thead th:last-child{border-radius:0 10px 0 0}
tbody tr{transition:background .12s}
tbody tr:hover{background:var(--bg)}
tbody tr:last-child td{border-bottom:none}

/* ---------- Badges ---------- */
.badge{display:inline-flex;align-items:center;gap:.3rem;padding:.22rem .6rem;border-radius:20px;font-size:11.5px;
  font-weight:700;line-height:1.4;letter-spacing:.01em}
.badge.green{background:var(--green-l);color:var(--green-dd)}
.badge.grey{background:var(--bg2);color:var(--muted)}
.badge.blue{background:var(--blue-l);color:var(--blue-d)}
.badge.purple{background:var(--purple-l);color:var(--purple-d)}
.badge.red{background:var(--red-l);color:#b91c1c}

/* ---------- Misc layout helpers ---------- */
.row-between{display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap}
.inline{display:inline-block}
.actions{display:flex;gap:.4rem;flex-wrap:wrap;align-items:center}

/* ---------- Collapsible boxes (details) ---------- */
details.box{border:1px solid var(--line);border-radius:var(--r-md);margin-bottom:.85rem;background:var(--surface);
  box-shadow:var(--sh-sm);overflow:hidden}
details.box>summary{padding:.95rem 1.15rem;font-weight:600;color:var(--navy);display:flex;align-items:center;gap:.5rem}
details.box>summary:hover{background:var(--bg)}
details.box[open]>summary{border-bottom:1px solid var(--line-2)}
details.box .body{padding:1.15rem}
details.inline{position:relative}

/* ---------- Modal dialogs ---------- */
dialog.modal{border:none;padding:0;border-radius:var(--r-xl);max-width:480px;width:calc(100% - 2rem);
  background:var(--surface);color:var(--ink);box-shadow:var(--sh-lg);overflow:visible}
dialog.modal.wide{max-width:600px}
dialog.modal::backdrop{background:rgba(15,23,42,.5);backdrop-filter:blur(4px)}
dialog.modal[open]{animation:modalIn .18s cubic-bezier(.2,.8,.2,1)}
@keyframes modalIn{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}
.modal-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;
  padding:1.2rem 1.4rem;border-bottom:1px solid var(--line-2)}
.modal-head h3{margin:0;font-size:1.1rem}
.modal-head .sub{font-size:12.5px;color:var(--muted);margin-top:.15rem}
.modal-x{flex-shrink:0;width:32px;height:32px;border-radius:9px;border:1px solid var(--line);background:var(--surface);
  color:var(--muted);font-size:1.1rem;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.14s}
.modal-x:hover{background:var(--bg2);color:var(--ink)}
.modal-body{padding:1.3rem 1.4rem;max-height:70vh;overflow-y:auto}
.modal-body label:first-child{margin-top:0}
.modal-foot{display:flex;justify-content:flex-end;gap:.6rem;padding:1rem 1.4rem;border-top:1px solid var(--line-2);background:var(--bg)}
.modal-foot.between{justify-content:space-between}
.avatar-lg{width:46px;height:46px;border-radius:12px;background:var(--grad-green);display:flex;align-items:center;
  justify-content:center;font-weight:800;color:#fff;font-size:18px;box-shadow:var(--sh-sm);flex-shrink:0}
/* enrollment rows inside a modal */
.enroll-row{display:flex;align-items:center;justify-content:space-between;gap:.8rem;padding:.6rem .2rem;border-bottom:1px solid var(--line-2)}
.enroll-row:last-child{border-bottom:none}
.enroll-row .ti{font-weight:600;font-size:13.5px}

/* ---------- Lessons ---------- */
.lesson{display:flex;align-items:center;gap:.85rem;padding:.8rem .95rem;border:1px solid var(--line);
  border-radius:12px;margin-bottom:.55rem;background:var(--surface);transition:.14s}
.lesson:hover{border-color:#d8ded9;box-shadow:var(--sh-sm)}
.lesson.done{background:var(--green-l);border-color:var(--green-l2)}
.lesson .t{flex:1;min-width:0}
.lesson .dur{color:var(--muted);font-size:12.5px;font-weight:500}

/* ---------- Responsive ---------- */
@media(max-width:980px){
  .login{grid-template-columns:1fr}.login-media{display:none}.login-form{padding:1.5rem}
}
@media(max-width:860px){
  .shell{grid-template-columns:1fr}
  .side{position:static;height:auto;flex-direction:row;flex-wrap:wrap;align-items:center;gap:.3rem;padding:.7rem 1rem}
  .side .brand{margin:.2rem .6rem .2rem 0;width:auto}
  .nav{display:flex;flex-wrap:wrap;gap:.2rem}.nav-label{display:none}
  .nav a.on::before{display:none}.nav .sep{display:none}
  .side .foot{margin:0}
  .main{padding:1.2rem 1.1rem 2.5rem}
}