/* =====================================================================
   HỌC VIỆN NHƯ TÂM — STYLES
   Khung UX theo hoclong.vn (Kajabi): trang sáng + màn học bài nền tối.
   Màu thương hiệu: Navy #0f2c4d · Vàng #c9a227 · nền sáng.
   ===================================================================== */

:root{
  --navy:#0f2c4d;
  --navy-2:#16395f;
  --gold:#c9a227;
  --gold-soft:#e6c34d;
  --coral:#e07856;      /* nhấn kiểu hoclong */
  --ink:#2c2c2c;
  --muted:#6b7280;
  --line:#e5e7eb;
  --bg:#ffffff;
  --bg-soft:#f7f8fa;
  --green:#1f9d57;
  --serif:"Georgia","Times New Roman",serif;
  --sans:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  /* dark player */
  --d-bg:#15171c;
  --d-side:#1c1f26;
  --d-card:#232732;
  --d-line:#2e333d;
  --d-ink:#e8eaed;
  --d-muted:#9aa1ad;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.55}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
img{max-width:100%;display:block}
.hidden{display:none !important}

h1,h2,h3,.serif{font-family:var(--serif)}

/* ---------- TOP NAV (light) ---------- */
.topbar{
  position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 32px;
}
.brand{display:flex;align-items:center;gap:10px}
.brand .logo{
  width:42px;height:42px;border-radius:10px;background:var(--navy);
  display:grid;place-items:center;color:var(--gold);font-family:var(--serif);font-weight:700;font-size:20px;
}
.brand .bt{line-height:1.1}
.brand .bt b{font-family:var(--serif);color:var(--navy);font-size:17px;letter-spacing:.3px}
.brand .bt span{display:block;font-size:11px;color:var(--gold);font-weight:600;letter-spacing:1px;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{color:#4b5563;font-size:15px;padding:6px 0;border-bottom:2px solid transparent}
.nav-links a:hover{color:var(--navy)}
.nav-links a.active{color:var(--coral);border-bottom-color:var(--coral)}
.nav-user{display:flex;align-items:center;gap:10px;color:#374151;font-size:14px}
.nav-user .avatar{width:34px;height:34px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:600}
.btn-ghost{background:none;border:none;color:var(--coral);font-size:14px}

/* ---------- PAGE WRAP ---------- */
.page{max-width:1180px;margin:0 auto;padding:40px 32px 80px}
.page-title{font-size:46px;color:#3a3a3a;margin:8px 0 18px;font-weight:400}
.page-sub{color:var(--muted);margin:-6px 0 26px;font-size:15px}
.tabs{display:flex;gap:30px;border-bottom:1px solid var(--line);margin-bottom:34px}
.tabs a{padding:10px 0;color:#555;border-bottom:2px solid transparent;font-size:15px}
.tabs a.active{color:var(--coral);border-bottom-color:var(--coral)}

/* ---------- LOGIN ---------- */
.login-wrap{min-height:100vh;display:grid;place-items:center;background:
  radial-gradient(1200px 600px at 50% -10%, #eaf0f7 0%, #fff 60%);}
.login-card{
  width:420px;max-width:92vw;background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:38px 34px;box-shadow:0 20px 60px rgba(15,44,77,.10);text-align:center;
}
.login-card .logo-lg{width:64px;height:64px;border-radius:14px;background:var(--navy);color:var(--gold);
  display:grid;place-items:center;font-family:var(--serif);font-size:30px;margin:0 auto 16px}
.login-card h1{font-size:24px;color:var(--navy);margin:0 0 4px}
.login-card p{color:var(--muted);font-size:14px;margin:0 0 22px}
.field{text-align:left;margin-bottom:16px}
.field label{display:block;font-size:13px;color:#374151;margin-bottom:6px;font-weight:600}
.field input,.field select{
  width:100%;padding:12px 14px;border:1px solid #d6dae1;border-radius:10px;font-size:15px;background:#fff;color:var(--ink)
}
.field input:focus,.field select:focus{outline:none;border-color:var(--navy);box-shadow:0 0 0 3px rgba(15,44,77,.1)}
.btn-primary{
  width:100%;padding:13px;border:none;border-radius:10px;background:var(--navy);color:#fff;font-size:16px;font-weight:600;
  transition:.15s
}
.btn-primary:hover{background:var(--navy-2)}
.login-hint{margin-top:18px;font-size:12.5px;color:var(--muted);line-height:1.7;text-align:left;background:var(--bg-soft);
  border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.login-hint b{color:#374151}

/* ---------- COURSE CARDS (dashboard) ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:28px}
.course-card{
  border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;
  box-shadow:0 6px 20px rgba(0,0,0,.04);transition:.18s;display:flex;flex-direction:column
}
.course-card:hover{transform:translateY(-3px);box-shadow:0 14px 32px rgba(15,44,77,.12)}
.cc-thumb{height:160px;background:linear-gradient(135deg,var(--navy) 0%,#1d4e84 100%);position:relative;
  display:grid;place-items:center;color:#fff;text-align:center;padding:18px}
.cc-thumb .cc-em{font-family:var(--serif);font-size:21px;line-height:1.25;text-shadow:0 1px 8px rgba(0,0,0,.25)}
.cc-thumb .cc-badge{position:absolute;top:12px;left:12px;background:rgba(255,255,255,.18);color:#fff;
  font-size:11px;padding:4px 10px;border-radius:20px;backdrop-filter:blur(4px)}
.ring{position:absolute;bottom:-26px;left:50%;transform:translateX(-50%);width:60px;height:60px}
.cc-body{padding:34px 20px 12px;text-align:center;flex:1}
.cc-body h3{font-size:20px;color:#3a3a3a;margin:0 0 4px;font-weight:500}
.cc-body .cc-meta{font-size:13px;color:var(--muted)}
.cc-foot{display:flex;border-top:1px solid var(--line)}
.cc-foot button{flex:1;background:none;border:none;padding:14px 8px;font-size:13.5px;color:#475569;
  display:flex;flex-direction:column;align-items:center;gap:5px}
.cc-foot button:hover{background:var(--bg-soft);color:var(--navy)}
.cc-foot button.primary{color:var(--coral);font-weight:600}
.cc-foot button+button{border-left:1px solid var(--line)}
.cc-foot .ic{font-size:16px}

/* progress ring text */
.ring-wrap{position:relative;width:60px;height:60px}
.ring-wrap .ring-pct{position:absolute;inset:0;display:grid;place-items:center;font-size:13px;font-weight:700;color:var(--coral)}

/* ---------- DARK COURSE PLAYER ---------- */
.player{display:flex;min-height:100vh;background:var(--d-bg);color:var(--d-ink)}
.player-side{
  width:380px;min-width:380px;background:var(--d-side);border-right:1px solid var(--d-line);
  height:100vh;overflow-y:auto;position:sticky;top:0
}
.ps-banner{height:120px;background:linear-gradient(135deg,var(--navy),#1d4e84);display:grid;place-items:center;
  color:var(--gold);font-family:var(--serif);font-size:26px}
.ps-head{padding:18px 22px;border-bottom:1px solid var(--d-line)}
.ps-back{color:var(--d-muted);font-size:14px;display:inline-flex;gap:6px;align-items:center;margin-bottom:12px}
.ps-back:hover{color:#fff}
.ps-title{font-family:var(--serif);font-size:22px;color:#fff;margin:0 0 16px;line-height:1.3}
.ps-prog-bar{height:6px;border-radius:6px;background:#2c313b;overflow:hidden}
.ps-prog-fill{height:100%;background:linear-gradient(90deg,var(--gold),var(--coral));width:0%}
.ps-prog-txt{font-size:13px;color:var(--d-muted);margin-top:8px}
.ps-prog-txt b{color:#fff}
.ps-search{margin:14px 22px}
.ps-search input{width:100%;background:#0f1115;border:1px solid var(--d-line);color:var(--d-ink);
  padding:11px 13px;border-radius:9px;font-size:13.5px}
.ps-search input::placeholder{color:#6b7280}

/* chapters */
.chapter{border-bottom:1px solid var(--d-line)}
.chap-head{display:flex;align-items:center;gap:12px;padding:15px 22px;cursor:pointer;user-select:none}
.chap-head:hover{background:#20242d}
.chap-check{width:26px;height:26px;border-radius:50%;flex:none;display:grid;place-items:center;
  background:#343a45;color:#6b7280;font-size:13px;border:2px solid #343a45}
.chap-check.done{background:var(--gold);border-color:var(--gold);color:#15171c;font-weight:700}
.chap-check.locked{background:transparent;border-color:#3a414d}
.chap-name{flex:1;font-size:15px;color:#e8eaed;font-weight:600}
.chap-count{font-size:13px;color:var(--d-muted)}
.chap-chevron{color:#6b7280;transition:.2s;margin-left:6px}
.chapter.open .chap-chevron{transform:rotate(180deg)}
.chap-lessons{display:none;padding:4px 0 12px}
.chapter.open .chap-lessons{display:block}

/* lessons (timeline) */
.lesson{display:flex;gap:14px;padding:8px 22px 8px 30px;position:relative;cursor:pointer}
.lesson:hover{background:#20242d}
.lesson.active{background:#262b35}
.lesson.locked{cursor:not-allowed;opacity:.55}
.les-dot{width:22px;height:22px;border-radius:50%;flex:none;margin-top:2px;display:grid;place-items:center;
  font-size:11px;background:#343a45;color:#7b828e;border:2px solid #343a45;z-index:1}
.les-dot.done{background:var(--gold);border-color:var(--gold);color:#15171c;font-weight:700}
.les-dot.current{background:var(--coral);border-color:var(--coral);color:#fff}
.les-line{position:absolute;left:40px;top:0;bottom:0;width:2px;background:#2c313b}
.lesson:first-child .les-line{top:14px}
.lesson:last-child .les-line{bottom:auto;height:14px}
.les-body{flex:1}
.les-title{font-size:14.5px;color:#dfe2e7;line-height:1.35}
.lesson.active .les-title{color:#fff}
.les-meta{font-size:11px;color:#7b828e;text-transform:uppercase;letter-spacing:.5px;margin-top:3px}
.les-meta .req{color:var(--gold-soft)}

/* quiz row in sidebar */
.lesson.quiz-row .les-dot{background:#3a2f1a;border-color:#5a4a26;color:var(--gold-soft)}
.lesson.quiz-row .les-dot.done{background:var(--green);border-color:var(--green);color:#fff}

/* ---------- CONTENT AREA (right) ---------- */
.player-main{flex:1;min-width:0;display:flex;flex-direction:column}
.pm-head{padding:18px 36px;border-bottom:1px solid var(--d-line);display:flex;align-items:center;
  justify-content:space-between;position:sticky;top:0;background:var(--d-bg);z-index:5}
.pm-head h2{font-size:19px;margin:0;color:#fff;font-family:var(--serif)}
.pm-head .crumbs{font-size:12.5px;color:var(--d-muted);margin-bottom:4px}
.pm-scroll{flex:1;overflow-y:auto;padding:34px 36px 80px}
.pm-inner{max-width:780px;margin:0 auto}

/* video placeholder */
.video-box{background:#000;border-radius:12px;aspect-ratio:16/9;display:grid;place-items:center;
  color:#6b7280;margin-bottom:26px;border:1px solid var(--d-line)}
.video-box .vb{text-align:center}
.video-box .vb .play{width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.1);
  display:grid;place-items:center;margin:0 auto 12px;font-size:24px;color:#fff}

/* lesson content blocks */
.content h3{color:#fff;font-family:var(--serif);font-size:20px;margin:26px 0 10px}
.content p{color:#c9cdd4;font-size:15.5px;margin:0 0 14px}
.content ul,.content ol{color:#c9cdd4;font-size:15.5px;padding-left:22px;margin:0 0 16px}
.content li{margin-bottom:8px}
.content b{color:#fff}
.content i{color:#aeb4bd}
.callout{background:#1f2937;border-left:4px solid var(--gold);border-radius:8px;padding:14px 18px;margin:0 0 18px}
.callout .ct{color:var(--gold-soft);font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px}
.callout .cb{color:#dfe2e7;font-size:15px}
.situation{background:#1a2433;border:1px solid #2a3852;border-radius:10px;padding:16px 18px;margin:0 0 18px}
.situation .st{color:#7fb3ff;font-weight:700;font-size:13px;margin-bottom:6px}
.situation .sb{color:#cdd6e3;font-size:15px}
.ck-list{list-style:none;padding:0;margin:0 0 16px}
.ck-list li{display:flex;gap:10px;color:#c9cdd4;font-size:15px;margin-bottom:9px;align-items:flex-start}
.ck-list li::before{content:"☐";color:var(--gold-soft);font-size:17px;line-height:1.3}
.ctable{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:14px}
.ctable th{background:#262b35;color:#fff;text-align:left;padding:10px 12px;border:1px solid var(--d-line);font-weight:600}
.ctable td{padding:10px 12px;border:1px solid var(--d-line);color:#c9cdd4;vertical-align:top}

/* lesson footer nav */
.lesson-foot{display:flex;justify-content:space-between;align-items:center;margin-top:30px;
  padding-top:22px;border-top:1px solid var(--d-line);gap:14px}
.btn-complete{background:linear-gradient(90deg,var(--gold),var(--coral));color:#15171c;border:none;
  padding:13px 26px;border-radius:10px;font-size:15px;font-weight:700}
.btn-complete:hover{filter:brightness(1.06)}
.btn-complete.done{background:#2a3a2c;color:var(--green);cursor:default}
.btn-next{background:#262b35;border:1px solid var(--d-line);color:#e8eaed;padding:13px 22px;border-radius:10px;font-size:14.5px}
.btn-next:hover{background:#2e333d}
.btn-next:disabled{opacity:.4;cursor:not-allowed}

/* ---------- QUIZ ---------- */
.quiz-card{max-width:760px;margin:0 auto}
.quiz-intro{background:var(--d-card);border:1px solid var(--d-line);border-radius:12px;padding:24px;margin-bottom:22px;text-align:center}
.quiz-intro h3{color:#fff;font-family:var(--serif);font-size:22px;margin:0 0 8px}
.quiz-intro p{color:var(--d-muted);font-size:14.5px;margin:0 0 16px}
.q-block{background:var(--d-card);border:1px solid var(--d-line);border-radius:12px;padding:20px 22px;margin-bottom:16px}
.q-num{color:var(--gold-soft);font-size:13px;font-weight:700;margin-bottom:6px}
.q-text{color:#fff;font-size:16px;margin-bottom:14px;font-weight:500}
.q-opt{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid var(--d-line);
  border-radius:9px;margin-bottom:9px;cursor:pointer;color:#c9cdd4;font-size:15px;transition:.12s}
.q-opt:hover{border-color:#4a5160;background:#20242d}
.q-opt.sel{border-color:var(--coral);background:#2a232050}
.q-opt .mk{width:22px;height:22px;border-radius:50%;border:2px solid #555c68;flex:none;display:grid;place-items:center;font-size:12px}
.q-opt.sel .mk{border-color:var(--coral);background:var(--coral);color:#fff}
.q-opt.correct{border-color:var(--green);background:#1c2a1f}
.q-opt.correct .mk{border-color:var(--green);background:var(--green);color:#fff}
.q-opt.wrong{border-color:#c0392b;background:#2a1c1c}
.q-opt.wrong .mk{border-color:#c0392b;background:#c0392b;color:#fff}
.q-explain{margin-top:8px;font-size:13.5px;color:#9aa1ad;background:#1b1e25;border-radius:8px;padding:10px 12px;border-left:3px solid var(--gold)}
.quiz-submit{text-align:center;margin-top:8px}

/* quiz result */
.result-card{background:var(--d-card);border:1px solid var(--d-line);border-radius:14px;padding:32px;text-align:center;max-width:520px;margin:0 auto 24px}
.result-card .score{font-size:54px;font-family:var(--serif);margin:8px 0}
.result-card.pass .score{color:var(--green)}
.result-card.fail .score{color:#e07856}
.result-card h3{color:#fff;font-size:22px;margin:0 0 6px}
.result-card p{color:var(--d-muted);margin:0 0 18px}
.result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ---------- CERTIFICATE ---------- */
.cert-page{padding:40px 32px 80px;background:var(--bg-soft);min-height:100vh}
.cert{max-width:880px;margin:0 auto;background:#fff;border:14px solid var(--navy);border-radius:6px;
  padding:54px 60px;text-align:center;position:relative;box-shadow:0 18px 50px rgba(0,0,0,.15)}
.cert::after{content:"";position:absolute;inset:14px;border:2px solid var(--gold);border-radius:3px;pointer-events:none}
.cert .logo-lg{width:70px;height:70px;border-radius:14px;background:var(--navy);color:var(--gold);
  display:grid;place-items:center;font-family:var(--serif);font-size:32px;margin:0 auto 14px}
.cert h2{font-family:var(--serif);color:var(--navy);font-size:18px;letter-spacing:2px;text-transform:uppercase;margin:0 0 6px}
.cert .big{font-family:var(--serif);font-size:40px;color:var(--gold);margin:14px 0}
.cert .name{font-family:var(--serif);font-size:34px;color:var(--navy);margin:18px 0 6px;border-bottom:2px solid var(--gold);display:inline-block;padding:0 30px 8px}
.cert .desc{color:#555;font-size:15px;max-width:560px;margin:14px auto}
.cert .sig{display:flex;justify-content:space-around;margin-top:40px}
.cert .sig div{font-size:13px;color:#666}
.cert .sig b{display:block;font-family:var(--serif);color:var(--navy);font-size:16px;margin-bottom:2px}
.cert-actions{max-width:880px;margin:22px auto 0;display:flex;gap:12px;justify-content:center}
.btn-nav{background:var(--navy);color:#fff;border:none;padding:11px 22px;border-radius:9px;font-size:14.5px}
.btn-nav.alt{background:#fff;color:var(--navy);border:1px solid var(--navy)}

/* ---------- ADMIN DASHBOARD ---------- */
.admin-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px;margin-bottom:30px}
.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 22px}
.stat .v{font-size:34px;font-family:var(--serif);color:var(--navy)}
.stat .l{font-size:13px;color:var(--muted);margin-top:2px}
.admin-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.admin-table th{background:var(--navy);color:#fff;text-align:left;padding:13px 16px;font-size:13.5px;font-weight:600}
.admin-table td{padding:12px 16px;border-top:1px solid var(--line);font-size:14px;color:#374151}
.admin-table tr:hover td{background:var(--bg-soft)}
.pill{display:inline-block;padding:3px 11px;border-radius:20px;font-size:12px;font-weight:600}
.pill.done{background:#dcfce7;color:#15803d}
.pill.prog{background:#fef3c7;color:#a16207}
.pill.none{background:#f3f4f6;color:#6b7280}
.mini-bar{height:8px;border-radius:6px;background:#eef0f3;overflow:hidden;width:120px;display:inline-block;vertical-align:middle}
.mini-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--gold),var(--coral))}
.note{font-size:13px;color:var(--muted);background:#fff8e6;border:1px solid #f0e0b0;border-radius:10px;
  padding:12px 16px;margin-bottom:22px}

/* empty / misc */
.empty{text-align:center;color:var(--muted);padding:60px 20px}
.foot{padding:26px 32px;color:#9aa1ad;font-size:13px;border-top:1px solid var(--line);text-align:center}

/* responsive */
@media(max-width:880px){
  .player{flex-direction:column}
  .player-side{width:100%;min-width:0;height:auto;position:relative}
  .pm-scroll{padding:22px 18px 60px}
  .page{padding:26px 18px 60px}
  .page-title{font-size:34px}
  .cert{padding:34px 22px}
  .cert .big{font-size:30px}
  .cert .name{font-size:26px}
}