/* =========================================================
   PointLMS Design System
   ========================================================= */
:root{
  --primary: #1e3a8a;
  --primary-light: #3b5bdb;
  --primary-dark: #14265c;
  --accent: #f59e0b;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
  --bg: #f4f6fb;
  --card-bg: #ffffff;
  --border: #e5e7eb;
  --text: #1f2937;
  --text-muted: #6b7280;
  --radius: 14px;
  --shadow-sm: 0 1px 3px rgba(16,24,40,.06);
  --shadow-md: 0 6px 18px rgba(16,24,40,.08);
  --sidebar-w: 250px;
  --topbar-h: 64px;
}

*{box-sizing:border-box;}
body{
  font-family:'Inter', 'Segoe UI', sans-serif;
  background:var(--bg);
  color:var(--text);
  margin:0;
}
h1,h2,h3,h4,h5,.brand-text,.font-heading{font-family:'Poppins',sans-serif;}

a{color:var(--primary);}
::selection{background:var(--primary-light);color:#fff;}

/* ---------------- Public / Auth Pages ---------------- */
.auth-wrapper{
  min-height:100vh;
  display:flex;
  align-items:stretch;
  background: linear-gradient(135deg,var(--primary-dark),var(--primary) 55%,var(--primary-light));
}
.auth-side{
  flex:1;
  color:#fff;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:60px 56px;
}
.auth-side h1{font-size:2.4rem;font-weight:700;line-height:1.2;}
.auth-side p{opacity:.9;font-size:1.05rem;max-width:460px;}
.auth-feature{display:flex;gap:14px;align-items:flex-start;margin-top:18px;}
.auth-feature i{font-size:1.4rem;background:rgba(255,255,255,.15);padding:10px;border-radius:10px;}
.auth-card-wrap{
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
  background:var(--bg);
  padding:32px 20px;
}
.auth-card{
  width:100%;
  max-width:440px;
  background:var(--card-bg);
  border-radius:var(--radius);
  box-shadow:var(--shadow-md);
  padding:40px 36px;
}
.auth-card .logo{font-size:2.2rem;}
.auth-card h2{font-weight:700;margin-bottom:4px;}
.auth-card .subtitle{color:var(--text-muted);margin-bottom:26px;}
@media(max-width:991px){
  .auth-side{display:none;}
}

.form-control, .form-select{
  border-radius:10px;
  border-color:var(--border);
  padding:.65rem .9rem;
}
.form-control:focus,.form-select:focus{
  border-color:var(--primary-light);
  box-shadow:0 0 0 .2rem rgba(59,91,219,.15);
}
.btn{border-radius:10px;font-weight:600;padding:.6rem 1.2rem;}
.btn-primary{background:var(--primary);border-color:var(--primary);}
.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);}
.btn-accent{background:var(--accent);border-color:var(--accent);color:#fff;}
.link-muted{color:var(--text-muted);text-decoration:none;}
.link-muted:hover{color:var(--primary);}

/* ---------------- App Shell (logged-in layout) ---------------- */
.topbar{
  position:sticky;top:0;z-index:1030;
  height:var(--topbar-h);
  background:#fff;
  border-bottom:1px solid var(--border);
  box-shadow:var(--shadow-sm);
}
.brand-badge{font-size:1.5rem;}
.brand-text{font-weight:700;color:var(--primary);font-size:1.15rem;}
.role-badge{padding:.4em .8em;border-radius:20px;font-weight:600;}
.role-badge.role-admin{background:#ede9fe;color:#5b21b6;}
.role-badge.role-instructor{background:#dbeafe;color:#1e40af;}
.role-badge.role-student{background:#dcfce7;color:#166534;}
.btn-user{background:transparent;border:1px solid var(--border);border-radius:30px;padding:.35rem .9rem .35rem .35rem;}
.avatar-circle{
  width:32px;height:32px;border-radius:50%;
  background:var(--primary);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  font-weight:700;font-size:.8rem;
}

.app-shell{display:flex;min-height:calc(100vh - var(--topbar-h));}
.sidebar{
  width:var(--sidebar-w);
  background:#fff;
  border-right:1px solid var(--border);
  flex-shrink:0;
  position:sticky;
  top:var(--topbar-h);
  height:calc(100vh - var(--topbar-h));
  overflow-y:auto;
}
.sidebar-link{
  display:flex;align-items:center;gap:12px;
  padding:12px 22px;
  color:var(--text-muted);
  font-weight:500;
  text-decoration:none;
  border-left:3px solid transparent;
}
.sidebar-link i{font-size:1.1rem;width:20px;text-align:center;}
.sidebar-link:hover{background:#f1f5ff;color:var(--primary);}
.sidebar-link.active{background:#eef2ff;color:var(--primary);border-left-color:var(--primary);font-weight:600;}
.sidebar-backdrop{display:none;}

.app-main{
  flex:1;
  min-width:0;
  padding:26px 30px 60px;
}
.page-title{font-weight:700;margin-bottom:4px;}
.page-subtitle{color:var(--text-muted);margin-bottom:26px;}

@media(max-width:991px){
  .sidebar{
    position:fixed;left:0;top:var(--topbar-h);
    height:calc(100vh - var(--topbar-h));
    transform:translateX(-100%);
    transition:transform .25s ease;
    z-index:1040;
  }
  .sidebar.show{transform:translateX(0);}
  .sidebar-backdrop.show{
    display:block;position:fixed;inset:var(--topbar-h) 0 0 0;
    background:rgba(0,0,0,.35);z-index:1035;
  }
  .app-main{padding:18px 16px 50px;}
}

/* ---------------- Cards / Widgets ---------------- */
.card-flat{
  background:var(--card-bg);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow-sm);
}
.stat-card{
  background:var(--card-bg);
  border-radius:var(--radius);
  padding:22px;
  box-shadow:var(--shadow-sm);
  border:1px solid var(--border);
  display:flex;align-items:center;gap:16px;
}
.stat-icon{
  width:52px;height:52px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.4rem;color:#fff;flex-shrink:0;
}
.stat-value{font-size:1.6rem;font-weight:700;}
.stat-label{color:var(--text-muted);font-size:.85rem;}

.subject-card{
  border-radius:var(--radius);
  overflow:hidden;
  background:#fff;
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  transition:transform .15s ease, box-shadow .15s ease;
  height:100%;
  text-decoration:none;
  color:inherit;
  display:block;
}
.subject-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);color:inherit;}
.subject-cover{
  height:110px;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:2rem;font-weight:700;
}
.subject-body{padding:16px 18px;}
.subject-code{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);font-weight:600;}

.quarter-tabs .nav-link{
  border-radius:10px 10px 0 0;
  font-weight:600;
  color:var(--text-muted);
}
.quarter-tabs .nav-link.active{color:var(--primary);border-color:var(--border) var(--border) #fff;}

.module-item, .assessment-item{
  border:1px solid var(--border);
  border-radius:12px;
  padding:14px 16px;
  display:flex;
  align-items:center;
  gap:14px;
  background:#fff;
  margin-bottom:10px;
}
.module-icon{font-size:1.6rem;}

.badge-type-quiz{background:#e0f2fe;color:#0369a1;}
.badge-type-assignment{background:#fef3c7;color:#92400e;}
.badge-type-exam{background:#fee2e2;color:#991b1b;}
.badge-pass{background:#dcfce7;color:#166534;}
.badge-fail{background:#fee2e2;color:#991b1b;}
.badge-pending{background:#f3f4f6;color:#4b5563;}

/* ---------------- Chat ---------------- */
.chat-shell{display:flex;height:calc(100vh - var(--topbar-h) - 52px);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff;}
.chat-list{width:280px;border-right:1px solid var(--border);overflow-y:auto;flex-shrink:0;}
.chat-list-item{padding:14px 16px;display:flex;gap:10px;align-items:center;cursor:pointer;border-bottom:1px solid #f1f1f1;text-decoration:none;color:inherit;}
.chat-list-item:hover, .chat-list-item.active{background:#f1f5ff;}
.chat-window{flex:1;display:flex;flex-direction:column;min-width:0;}
.chat-messages{flex:1;overflow-y:auto;padding:20px;background:#f8fafc;}
.chat-bubble{max-width:70%;padding:10px 14px;border-radius:16px;margin-bottom:10px;font-size:.92rem;line-height:1.4;}
.chat-bubble.mine{background:var(--primary);color:#fff;margin-left:auto;border-bottom-right-radius:4px;}
.chat-bubble.theirs{background:#fff;border:1px solid var(--border);border-bottom-left-radius:4px;}
.chat-input-bar{border-top:1px solid var(--border);padding:12px 16px;display:flex;gap:10px;}
@media(max-width:767px){
  .chat-list{width:100%;}
  .chat-shell{flex-direction:column;height:auto;}
  .chat-window{height:60vh;}
}

/* ---------------- Exam / Lockdown ---------------- */
.exam-shell{background:#fff;min-height:100vh;}
.exam-topbar{
  position:sticky;top:0;z-index:20;
  background:var(--primary-dark);color:#fff;
  padding:12px 22px;display:flex;justify-content:space-between;align-items:center;
}
.exam-timer{font-family:'Poppins',monospace;font-size:1.2rem;font-weight:700;background:rgba(255,255,255,.15);padding:6px 16px;border-radius:8px;}
.exam-timer.low-time{background:var(--danger);}
.exam-question-card{border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px;}
.warning-toast{
  position:fixed;top:80px;right:20px;z-index:2000;
  background:var(--danger);color:#fff;padding:14px 20px;border-radius:10px;
  box-shadow:var(--shadow-md);max-width:320px;
}

/* ---------------- Misc ---------------- */
.step-badge{width:34px;height:34px;border-radius:50%;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;}
.dropzone{border:2px dashed var(--border);border-radius:12px;padding:30px;text-align:center;color:var(--text-muted);background:#fafbff;}
.dropzone.dragover{border-color:var(--primary);background:#eef2ff;}
.table thead th{border-bottom-width:1px;color:var(--text-muted);font-weight:600;font-size:.82rem;text-transform:uppercase;letter-spacing:.03em;}
.copy-code-box{
  background:#111827;color:#f9fafb;font-family:monospace;font-size:1.4rem;
  letter-spacing:.25em;padding:14px 20px;border-radius:10px;text-align:center;
}
footer.site-footer{padding:30px 0;text-align:center;color:var(--text-muted);font-size:.85rem;}