/* ==========================================================================
   app-shared.css
   Shared boilerplate for the "flat navy" page family (dashboard, student,
   teacher, parent, tools, year6, assessment-engine, index/register/etc).
   These pages are single-theme (dark) and do not use tokens.css's
   theme-aware [data-theme] system — that system is reserved for the 4
   subject dashboard pages (physics/chemistry/biology/maths.html).

   Canonical colour values (matches CLAUDE.md "Base colour"/"Gold accent"
   and tokens.css's --gold):
     --navy: #0b1628   --gold: #c9a84c
   ========================================================================== */

:root{
  --navy:#0b1628;--navy2:#112240;--navy3:#1a3a5c;
  --gold:#c9a84c;--gold2:#e8c96a;
  --orange:#e8620a;--teal:#0e7c7b;
  --white:#ffffff;--off:#f7f6f2;
  --border:#1e3a5f;--border2:#d6d0c4;
  --muted:#7a8fa6;--muted2:#6b6558;
  --green:#16803c;--red:#b92b1a;
  --r:6px;
}

/* reset / base */
*{box-sizing:border-box;margin:0;padding:0;}
html{overflow-x:hidden;}
body{font-family:var(--font-body);background:var(--navy);color:var(--white);min-height:100vh;line-height:1.6;overflow-x:hidden;}
a{text-decoration:none;color:inherit;}
button{cursor:pointer;font-family:var(--font-body);}
input,select{font-family:var(--font-body);}

/* scrollbar */
::-webkit-scrollbar{width:6px;}
::-webkit-scrollbar-track{background:var(--navy2);}
::-webkit-scrollbar-thumb{background:var(--navy3);border-radius:3px;}

/* utility */
.gold{color:var(--gold);}
.orange{color:var(--orange);}
.muted{color:var(--muted);}
.mono{font-family:var(--font-mono);}
.serif{font-family:var(--font-display);}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.65rem 1.4rem;border-radius:var(--r);border:none;font-size:.9rem;font-weight:600;transition:all .2s;}
.btn-gold{background:var(--gold);color:var(--navy);}
.btn-gold:hover{background:var(--gold2);}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--muted);}
.btn-outline:hover{border-color:var(--gold);color:var(--gold);}
.btn-danger{background:var(--red);color:white;}

/* card */
.card{background:var(--navy2);border:1px solid var(--border);border-radius:var(--r);padding:1.5rem;}
.card:hover{border-color:var(--navy3);}

/* badge */
.badge{display:inline-block;font-family:var(--font-mono);font-size:.65rem;letter-spacing:.1em;text-transform:uppercase;padding:.2rem .55rem;border-radius:3px;}
.badge-gold{background:#c9a84c22;color:var(--gold);}
.badge-green{background:#16803c22;color:#4ade80;}
.badge-red{background:#b92b1a22;color:#f87171;}
.badge-blue{background:#1c4f8a22;color:#60a5fa;}
.badge-orange{background:#e8620a22;color:var(--orange);}

/* mastery colours */
.mastery-not_started{color:var(--muted);}
.mastery-learning{color:#f87171;}
.mastery-developing{color:#fb923c;}
.mastery-secure{color:#facc15;}
.mastery-mastered{color:#4ade80;}

/* toast */
#toast{position:fixed;bottom:2rem;right:2rem;background:var(--navy2);border:1px solid var(--border);
  padding:.8rem 1.2rem;border-radius:var(--r);font-size:.85rem;
  transform:translateY(100px);opacity:0;transition:all .3s;z-index:9999;max-width:320px;}
#toast.show{transform:translateY(0);opacity:1;}
#toast.success{border-color:var(--green);}
#toast.error{border-color:var(--red);}

/* loading */
.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--gold);
  border-radius:50%;animation:spin .7s linear infinite;display:inline-block;}
@keyframes spin{to{transform:rotate(360deg);}}

/* fade-in */
.fade-in{animation:fadeIn .4s ease both;}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px);}to{opacity:1;transform:translateY(0);}}

/* modal */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);z-index:1000;
  display:flex;align-items:center;justify-content:center;padding:1rem;}
.modal{background:var(--navy2);border:1px solid var(--border);border-radius:var(--r);
  padding:2rem;max-width:480px;width:100%;position:relative;}
.modal-close{position:absolute;top:1rem;right:1rem;background:none;border:none;
  color:var(--muted);font-size:1.2rem;cursor:pointer;}
.modal-close:hover{color:var(--white);}

/* profile dropdown */
.profile-dropdown-wrapper{position:relative;}
.profile-dropdown{
  position:absolute;top:calc(100% + .5rem);right:0;
  background:var(--navy2);border:1px solid var(--border);border-radius:var(--r);
  min-width:320px;box-shadow:0 8px 24px rgba(0,0,0,.4);z-index:1001;
  display:none;
}
.profile-dropdown.show{display:block;}
.profile-dropdown-header{
  padding:1rem 1.25rem;border-bottom:1px solid var(--border);
}
.profile-dropdown-title{font-weight:600;font-size:.9rem;color:var(--gold);}
.profile-dropdown-body{padding:1.25rem;}
.profile-form-group{margin-bottom:1rem;}
.profile-form-group:last-of-type{margin-bottom:0;}
.profile-label{
  display:block;font-size:.75rem;text-transform:uppercase;
  letter-spacing:.08em;color:var(--muted);margin-bottom:.4rem;
}
.profile-input,.profile-select{
  width:100%;background:var(--navy);border:1px solid var(--border);
  border-radius:var(--r);padding:.65rem .9rem;color:var(--white);
  font-size:.88rem;transition:border-color .2s;
}
.profile-input:focus,.profile-select:focus{
  outline:none;border-color:var(--gold);
}
.profile-input:disabled{
  background:var(--navy3);color:var(--muted);cursor:not-allowed;
}
.profile-actions{
  display:flex;gap:.6rem;margin-top:1.25rem;padding-top:1.25rem;
  border-top:1px solid var(--border);
}
.profile-save-btn{
  flex:1;background:var(--gold);color:var(--navy);
  border:none;padding:.7rem;border-radius:var(--r);
  font-weight:600;font-size:.88rem;cursor:pointer;transition:all .2s;
}
.profile-save-btn:hover{background:var(--gold2);}
.profile-save-btn:disabled{opacity:.5;cursor:not-allowed;}
.profile-signout-btn{
  flex:1;background:transparent;border:1px solid var(--red);
  color:var(--red);padding:.7rem;border-radius:var(--r);
  font-weight:600;font-size:.88rem;cursor:pointer;transition:all .2s;
}
.profile-signout-btn:hover{background:var(--red);color:var(--white);}

/* top nav */
.topnav{
  background:var(--navy2);border-bottom:1px solid var(--border);
  padding:.75rem 1rem;display:flex;align-items:center;gap:.75rem;
  position:sticky;top:0;z-index:100;
}
.topnav-logo img{height:36px;width:auto;border-radius:8px;max-width:120px;}
.topnav-title{
  font-family:var(--font-display);font-size:.95rem;font-weight:700;
  color:var(--gold);flex:1;
}
.nav-links{display:none;gap:.3rem;}
.nav-link{
  padding:.45rem .9rem;border-radius:var(--r);font-size:.82rem;font-weight:500;
  color:var(--muted);background:none;border:none;transition:all .2s;
}
.nav-link:hover,.nav-link.active{background:var(--navy3);color:var(--white);}
.nav-user{
  display:flex;align-items:center;gap:.75rem;
  padding:.4rem .8rem;border:1px solid var(--border);border-radius:var(--r);
  font-size:.82rem;cursor:pointer;transition:all .2s;
}
.nav-user:hover{border-color:var(--gold);}
.nav-user span:last-child{display:none;} /* "Sign out" text — mobile hides it */
.avatar{
  width:30px;height:30px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:.82rem;flex-shrink:0;
}