@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --secondary:#0f766e;
  --accent:#14b8a6;
  --bg:#f4f7fb;
  --surface:#ffffff;
  --surface-soft:#eff6ff;
  --text:#172033;
  --muted:#64748b;
  --border:#dbe3ef;
  --success:#059669;
  --danger:#dc2626;
  --nav:#0f172a;
  --nav-hover:#1e3a5f;
  --shadow:0 12px 35px rgba(15,23,42,.08);
}

*{box-sizing:border-box}
body{
  background:var(--bg);
  color:var(--text);
  font-family:'Inter',system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
a{color:var(--primary)}
.btn-primary{
  background:linear-gradient(135deg,var(--primary),#8b5cf6);
  border:0;
  box-shadow:0 7px 18px rgba(37,99,235,.22);
}
.btn-primary:hover,.btn-primary:focus{
  background:linear-gradient(135deg,var(--primary-dark),var(--primary));
  transform:translateY(-1px);
}
.btn-outline-primary{color:var(--primary);border-color:#93c5fd}
.btn-outline-primary:hover{background:var(--primary);border-color:var(--primary)}
.btn-dark{background:#0f172a;border-color:#0f172a}
.btn-outline-dark{color:#0f172a;border-color:#cbd5e1}
.form-control,.form-select{
  border:1px solid var(--border);
  border-radius:11px;
  padding:.72rem .85rem;
}
.form-control:focus,.form-select:focus{
  border-color:#60a5fa;
  box-shadow:0 0 0 .2rem rgba(37,99,235,.12);
}
.card,.table-card,.form-card,.course-card,.search-result-card{
  background:var(--surface);
  border:1px solid rgba(229,225,240,.9);
  border-radius:18px;
  box-shadow:var(--shadow);
}
.card-stat{
  border:0;
  border-radius:18px;
  box-shadow:var(--shadow);
  transition:transform .2s ease,box-shadow .2s ease;
}
.card-stat:hover{transform:translateY(-4px);box-shadow:0 18px 42px rgba(15,23,42,.12)}
.card-stat h2{font-weight:800;margin-bottom:0;color:var(--primary-dark)}
.table-card{overflow:hidden}
.table-card .card-header{background:var(--surface)!important;border-bottom:1px solid var(--border)}
.table{--bs-table-bg:transparent;color:var(--text)}
.table thead th{background:#f8fafc;color:#475569;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;border-bottom:1px solid var(--border)}
.table td,.table th{vertical-align:middle}
.table-hover tbody tr:hover{background:#faf8ff}
.page-title{font-weight:800;letter-spacing:-.03em}
.small-muted{color:var(--muted);font-size:.88rem}
.badge-role{text-transform:capitalize}
.action-btns .btn{margin-right:4px;margin-bottom:4px}
.pagination .page-link{
  color:var(--primary);
  border-color:var(--border);
  border-radius:9px;
  margin-right:4px;
}
.pagination .active .page-link{background:var(--primary);border-color:var(--primary)}
.file-help{border:1px dashed #93c5fd;border-radius:12px;padding:14px;background:var(--surface-soft)}
.course-card{transition:transform .2s ease,box-shadow .2s ease}
.course-card:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(50,31,88,.12)}
.pdf-preview{width:100%;min-height:640px;border:0;border-radius:0 0 18px 18px;background:#f8fafc}
.notification-item{padding:14px 0;border-bottom:1px solid var(--border)}
.notification-item:last-child{border-bottom:0}
.notification-item.unread{background:#f3efff;border-radius:12px;padding:14px;margin-bottom:8px}

/* New navigation */
.navbar{
  background:var(--nav)!important;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.navbar-brand{
  letter-spacing:-.02em;
}
.navbar .nav-link{color:#d9d1e9!important;border-radius:9px;margin:0 2px}
.navbar .nav-link:hover,.navbar .nav-link.active{background:var(--nav-hover);color:#fff!important}
.navbar .btn-outline-light{
  border-color:#5b4b74;color:#eee7f8;
}
.navbar .btn-outline-light:hover{background:#fff;color:var(--nav);border-color:#fff}

/* New login / first page */
.auth-wrapper{
  min-height:100vh;
  padding:0;
  display:flex;
  align-items:stretch;
  justify-content:center;
  background:
    radial-gradient(circle at 15% 15%,rgba(37,99,235,.12),transparent 28%),
    radial-gradient(circle at 85% 80%,rgba(20,184,166,.10),transparent 28%),
    #f4f7fb;
}
.login-shell{
  width:100%;
  min-height:100vh;
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(420px,.95fr);
}
.login-brand-panel{
  position:relative;
  overflow:hidden;
  padding:clamp(38px,7vw,90px);
  display:flex;
  flex-direction:column;
  justify-content:center;
  color:#fff;
  background:
    radial-gradient(circle at 20% 20%,rgba(96,165,250,.20),transparent 25%),
    radial-gradient(circle at 80% 75%,rgba(45,212,191,.14),transparent 28%),
    linear-gradient(145deg,#0f172a 0%,#1e40af 48%,#0f766e 100%);
}
.login-brand-panel:before,.login-brand-panel:after{
  content:"";position:absolute;border:1px solid rgba(255,255,255,.13);border-radius:50%;
}
.login-brand-panel:before{width:420px;height:420px;right:-170px;top:-150px}
.login-brand-panel:after{width:300px;height:300px;left:-160px;bottom:-150px}
.brand-mark{
  width:58px;height:58px;border-radius:17px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,#60a5fa,#2dd4bf);
  color:#0f172a;font-weight:900;font-size:1.25rem;
  box-shadow:0 14px 35px rgba(0,0,0,.25);
  margin-bottom:28px;
}
.login-brand-panel h1{
  font-size:clamp(2.4rem,5vw,4.7rem);
  line-height:1.02;letter-spacing:-.055em;
  max-width:680px;font-weight:800;
}
.login-brand-panel .lead{
  color:#dbeafe;max-width:610px;font-size:1.08rem;line-height:1.75;
}
.feature-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.feature-pill{
  padding:10px 14px;border-radius:999px;
  border:1px solid rgba(255,255,255,.15);
  background:rgba(255,255,255,.07);
  backdrop-filter:blur(8px);
  color:#f8fafc;font-size:.88rem;
}
.login-form-panel{
  display:flex;align-items:center;justify-content:center;
  padding:35px clamp(25px,6vw,85px);
  background:#fff;
}
.login-card{
  width:100%;max-width:470px;
}
.login-card .eyebrow{
  color:var(--primary);font-weight:800;font-size:.78rem;
  text-transform:uppercase;letter-spacing:.14em;
}
.login-card h2{font-size:2.25rem;font-weight:800;letter-spacing:-.04em;margin:.35rem 0 .6rem}
.login-card .subtitle{color:var(--muted);margin-bottom:30px}
.login-card .form-label{font-weight:600;font-size:.9rem}
.login-card .form-control{min-height:52px;background:#f8fafc}
.login-card .btn-primary{min-height:52px;font-weight:700}
.login-card .register-link{
  color:var(--primary);font-weight:700;text-decoration:none;
}
.login-card .register-link:hover{text-decoration:underline}
@media(max-width:900px){
  .login-shell{grid-template-columns:1fr}
  .login-brand-panel{min-height:44vh;padding:45px 28px}
  .login-brand-panel h1{font-size:2.65rem}
  .login-form-panel{padding:48px 25px}
}
@media(max-width:768px){.pdf-preview{min-height:420px}}

/* Dark mode retained with the new palette */
body.dark-mode{background:#100b1c;color:#e2e8f0}
body.dark-mode .card,body.dark-mode .table-card,body.dark-mode .form-card,
body.dark-mode .course-card,body.dark-mode .search-result-card{
  background:#111827;color:#e2e8f0;border-color:#26354a
}
body.dark-mode .table{color:#e2e8f0}
body.dark-mode .table thead th{background:#172033;color:#cbd5e1}
body.dark-mode .table-hover tbody tr:hover{color:#fff;background:#1e293b}
body.dark-mode .small-muted,body.dark-mode .text-muted{color:#94a3b8!important}
body.dark-mode .form-control,body.dark-mode .form-select{
  background:#0f172a;color:#e2e8f0;border-color:#334155
}
body.dark-mode .file-help{background:#0f172a;border-color:#334155}
body.dark-mode .notification-item{border-color:#334155}
body.dark-mode .notification-item.unread{background:#1e3a5f}

/* Minimal front page */
.auth-wrapper{
  min-height:100vh;
  padding:24px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:
    radial-gradient(circle at 10% 10%,rgba(37,99,235,.10),transparent 30%),
    radial-gradient(circle at 90% 90%,rgba(20,184,166,.10),transparent 30%),
    #f8fafc;
}
.simple-login-page{
  width:100%;
  min-height:calc(100vh - 48px);
  display:flex;
  align-items:center;
  justify-content:center;
}
.simple-login-card{
  width:min(430px,100%);
  padding:42px;
  background:#fff;
  border:1px solid #dbe3ef;
  border-radius:24px;
  box-shadow:0 24px 70px rgba(15,23,42,.10);
}
.login-logo{
  width:56px;height:56px;border-radius:16px;
  display:grid;place-items:center;
  margin:0 auto 22px;
  background:linear-gradient(135deg,#2563eb,#14b8a6);
  color:#fff;font-weight:800;font-size:1.05rem;
}
.simple-login-card .eyebrow{
  text-align:center;
  color:#2563eb;
  font-weight:800;
  font-size:.72rem;
  letter-spacing:.14em;
}
.simple-login-card h1{
  text-align:center;
  font-size:2rem;
  font-weight:800;
  letter-spacing:-.04em;
  margin:.35rem 0 .25rem;
  color:#172033;
}
.simple-login-card .subtitle{
  text-align:center;
  color:#64748b;
  margin-bottom:28px;
}
.simple-login-card .form-label{font-weight:600;font-size:.88rem;color:#334155}
.simple-login-card .form-control{
  min-height:50px;
  background:#f8fafc;
}
.simple-login-card .btn-primary{
  min-height:50px;
  font-weight:700;
  background:linear-gradient(135deg,#2563eb,#0f766e);
}
.simple-login-card .register-link{
  color:#2563eb;font-weight:700;text-decoration:none;
}
.simple-login-card .register-link:hover{text-decoration:underline}
@media(max-width:500px){
  .auth-wrapper{padding:14px}
  .simple-login-page{min-height:calc(100vh - 28px)}
  .simple-login-card{padding:30px 24px;border-radius:20px}
}


/* Reference-style login page */
.reference-login{
  min-height:100vh;
  padding:0;
  background:#fff;
  display:block;
}
.reference-login-shell{
  min-height:100vh;
  display:grid;
  grid-template-columns:43% 57%;
  background:#fff;
}
.reference-visual-panel{
  position:relative;
  min-height:100vh;
  overflow:hidden;
  background-image:url('../images/login-study.jpg');
  background-size:cover;
  background-position:center center;
}
.visual-overlay{
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(13,62,143,.68),rgba(24,74,166,.94));
}
.visual-content{
  position:absolute;
  z-index:2;
  left:48px;
  right:40px;
  bottom:72px;
  color:#fff;
}
.visual-content h2{
  font-size:clamp(2rem,3.2vw,3.15rem);
  line-height:1.35;
  letter-spacing:-.04em;
  font-weight:800;
  margin:0;
}
.visual-line{
  width:58px;
  height:3px;
  margin:28px 0 28px;
  background:#18c7b2;
  border-radius:10px;
}
.visual-content p{
  max-width:430px;
  margin:0;
  font-size:1.05rem;
  line-height:1.7;
  color:rgba(255,255,255,.92);
}
.reference-form-panel{
  display:flex;
  align-items:center;
  justify-content:center;
  padding:40px 7vw;
  background:#fff;
}
.reference-form{
  width:min(490px,100%);
}
.reference-form h1{
  margin:0;
  color:#102653;
  font-size:clamp(2.25rem,3.3vw,3.1rem);
  line-height:1.1;
  font-weight:800;
  letter-spacing:-.05em;
}
.reference-subtitle{
  margin:16px 0 42px;
  color:#6f7d99;
  font-size:1.15rem;
}
.reference-error{
  border-radius:12px;
  margin-bottom:18px;
}
.reference-field{
  height:66px;
  border:1px solid #d6deea;
  border-radius:5px;
  display:flex;
  align-items:center;
  background:#fff;
  margin-bottom:18px;
  transition:border-color .2s,box-shadow .2s;
}
.reference-field:focus-within{
  border-color:#2d67df;
  box-shadow:0 0 0 3px rgba(45,103,223,.10);
}
.reference-field .field-icon{
  width:58px;
  text-align:center;
  color:#6f7f9d;
  font-size:1.35rem;
}
.reference-field input{
  border:0;
  outline:0;
  width:100%;
  height:100%;
  padding:0 18px 0 0;
  color:#172033;
  font-size:1.05rem;
  background:transparent;
}
.reference-field input::placeholder{color:#98a4b8}
.reference-options{
  display:flex;
  align-items:center;
  margin:8px 0 26px;
  color:#5d6c88;
}
.reference-options label{
  display:flex;
  align-items:center;
  gap:9px;
  cursor:pointer;
  font-size:1rem;
}
.reference-options input{
  width:21px;
  height:21px;
  accent-color:#2563eb;
}
.reference-signin{
  width:100%;
  height:62px;
  border:0;
  border-radius:4px;
  color:#fff;
  font-size:1.08rem;
  font-weight:700;
  background:linear-gradient(90deg,#11b8a5,#0aa995);
  box-shadow:0 10px 22px rgba(10,169,149,.18);
  cursor:pointer;
  transition:transform .2s,box-shadow .2s;
}
.reference-signin:hover{
  transform:translateY(-1px);
  box-shadow:0 14px 28px rgba(10,169,149,.23);
}
.reference-register{
  text-align:center;
  margin:34px 0 0;
  color:#6f7d99;
  font-size:1rem;
}
.reference-register a{
  color:#2563eb;
  font-weight:700;
  text-decoration:none;
  margin-left:5px;
}
.reference-register a:hover{text-decoration:underline}
@media(max-width:850px){
  .reference-login-shell{grid-template-columns:1fr}
  .reference-visual-panel{min-height:42vh}
  .visual-content{left:30px;right:25px;bottom:38px}
  .visual-content h2{font-size:2rem}
  .reference-form-panel{min-height:58vh;padding:45px 28px}
}
@media(max-width:500px){
  .reference-visual-panel{min-height:35vh}
  .visual-content h2{font-size:1.65rem}
  .visual-content p{font-size:.9rem}
  .reference-subtitle{margin-bottom:30px}
}

/* FINAL LOGIN REFERENCE FIX */
.auth-wrapper.reference-login{
  min-height:100vh !important;
  width:100% !important;
  margin:0 !important;
  padding:0 !important;
  display:block !important;
  background:#fff !important;
}
.reference-login-shell{
  width:100%;
  min-height:100vh;
  display:grid;
  grid-template-columns:42% 58%;
  overflow:hidden;
}
.reference-visual-panel{
  position:relative;
  min-height:100vh;
  background:
    linear-gradient(180deg,rgba(9,50,120,.18),rgba(12,57,135,.72)),
    url('../images/study.svg') center/cover no-repeat;
}
.reference-visual-panel .visual-overlay{
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(16,64,150,.05),rgba(7,42,103,.55));
}
.reference-visual-panel .visual-content{
  position:absolute;
  z-index:2;
  left:clamp(32px,6vw,72px);
  right:35px;
  bottom:clamp(45px,9vh,90px);
  color:#fff;
}
.reference-visual-panel .visual-content h2{
  margin:0;
  font-family:Inter,Arial,sans-serif;
  font-size:clamp(2rem,3.3vw,3.15rem);
  line-height:1.18;
  font-weight:800;
  letter-spacing:-.045em;
}
.reference-visual-panel .visual-line{
  width:55px;height:4px;margin:23px 0;border-radius:4px;background:#14b8a6;
}
.reference-visual-panel .visual-content p{
  max-width:420px;margin:0;color:rgba(255,255,255,.92);
  font-size:1rem;line-height:1.65;
}
.reference-form-panel{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:40px clamp(28px,7vw,105px);
  background:#fff;
}
.reference-form{
  width:min(490px,100%);
}
.reference-form h1{
  margin:0;
  color:#0f1f3d;
  font-family:Inter,Arial,sans-serif;
  font-size:clamp(2.2rem,3.2vw,3.05rem);
  font-weight:800;
  letter-spacing:-.05em;
}
.reference-subtitle{
  margin:11px 0 38px;
  color:#64748b;
  font-size:1rem;
}
.reference-field{
  height:56px;
  position:relative;
  margin-bottom:18px;
}
.reference-field .field-icon{
  position:absolute;left:16px;top:50%;transform:translateY(-50%);
  color:#94a3b8;font-size:16px;z-index:2;
}
.reference-field input{
  width:100%;height:56px;
  border:1px solid #d7e0eb !important;
  border-radius:5px !important;
  outline:none !important;
  padding:0 16px 0 48px !important;
  background:#fff !important;
  color:#172033 !important;
  font-family:Inter,Arial,sans-serif;
  font-size:.95rem;
  box-shadow:none !important;
}
.reference-field input:focus{
  border-color:#3b82f6 !important;
  box-shadow:0 0 0 3px rgba(37,99,235,.10) !important;
}
.reference-options{
  margin:3px 0 25px;
  color:#64748b;
  font-size:.9rem;
}
.reference-options label{
  display:flex;align-items:center;gap:8px;cursor:pointer;
}
.reference-options input{width:17px;height:17px;accent-color:#2563eb;}
.reference-signin{
  width:100%;height:55px;border:0;border-radius:5px;
  background:#14b8a6 !important;color:#fff !important;
  font-family:Inter,Arial,sans-serif;font-size:1rem;font-weight:700;
  cursor:pointer;box-shadow:0 8px 18px rgba(20,184,166,.16);
  transition:.2s ease;
}
.reference-signin:hover{background:#0f9f90 !important;transform:translateY(-1px);}
.reference-register{
  text-align:center;margin:28px 0 0;color:#64748b;font-size:.92rem;
}
.reference-register a{color:#2563eb;font-weight:700;text-decoration:none;}
.reference-register a:hover{text-decoration:underline;}
.reference-error{margin-bottom:20px;border-radius:6px;}

@media(max-width:900px){
  .reference-login-shell{grid-template-columns:1fr;}
  .reference-visual-panel{min-height:360px;}
  .reference-visual-panel .visual-content{
    position:relative;left:auto;right:auto;bottom:auto;
    min-height:360px;padding:50px 28px;
    display:flex;flex-direction:column;justify-content:flex-end;
  }
  .reference-form-panel{min-height:auto;padding:55px 28px;}
}
@media(max-width:520px){
  .reference-visual-panel{min-height:300px;}
  .reference-visual-panel .visual-content{min-height:300px;padding:32px 22px;}
  .reference-visual-panel .visual-content h2{font-size:1.8rem;}
  .reference-form-panel{padding:45px 20px;}
}

/* PROJECT-WIDE FINAL COLOR SYSTEM */
:root{
 --primary:#2563eb!important;--primary-dark:#1d4ed8!important;
 --secondary:#0f766e!important;--accent:#14b8a6!important;
 --bg:#f4f7fb!important;--surface:#ffffff!important;
 --surface-soft:#eff6ff!important;--text:#172033!important;
 --muted:#64748b!important;--border:#dbe3ef!important;
 --nav:#0f172a!important;--nav-hover:#1e3a5f!important;
}
body{background:#f4f7fb!important;color:#172033!important}
.navbar{background:#0f172a!important}
.btn-primary{background:#2563eb!important;border-color:#2563eb!important}
.btn-primary:hover{background:#1d4ed8!important;border-color:#1d4ed8!important}
.text-primary{color:#2563eb!important}
.bg-primary{background:#2563eb!important}
.text-success{color:#059669!important}
.bg-success{background:#059669!important}