/* =====================================================================
   NEET CTK IGNITION — "Seven Hills" visual system
   Palette: warm cream base, soft mist-blue / sage / lavender hill bands,
   terracotta-clay accent for CTAs (the "summit marker").
   Display face: Fraunces (warm, academic serif)
   Body face: Sora (calm, rounded geometric sans)
   ===================================================================== */

:root{
  --cream:        #FBF6EE;
  --cream-deep:   #F3ECDF;
  --paper:        #FFFDF9;
  --ink:          #3E3A36;
  --ink-soft:     #7A7468;

  --hill-1: #E7D9C9; /* foothill - warm sand */
  --hill-2: #D9E4D3; /* sage */
  --hill-3: #CFE3E6; /* mist blue */
  --hill-4: #DCD8EC; /* lavender */
  --hill-5: #E7D6E3; /* dusty rose */
  --hill-6: #D6E6DD; /* deep sage */
  --hill-7: #CBDCE8; /* far peak blue */

  --accent: #D98E5B;       /* clay terracotta */
  --accent-deep: #C4753F;
  --accent-soft: #F3DCC9;

  --ok: #7FAE8E;
  --warn: #D9A65B;

  --border: #E8E0D2;
  --shadow: 0 10px 30px -12px rgba(80, 65, 45, 0.18);
  --shadow-sm: 0 4px 14px -6px rgba(80, 65, 45, 0.14);

  --radius-lg: 26px;
  --radius-md: 16px;
  --radius-sm: 10px;

  --font-display: 'Fraunces', serif;
  --font-body: 'Sora', sans-serif;
}

*{ margin:0; padding:0; box-sizing:border-box; }

html{ scroll-behavior:smooth; }

body{
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Ambient hill backdrop painted once behind the whole app */
body::before{
  content:"";
  position: fixed; inset:0; z-index:-1;
  background:
    radial-gradient(ellipse 70% 40% at 20% 100%, var(--hill-3) 0%, transparent 60%),
    radial-gradient(ellipse 60% 35% at 80% 100%, var(--hill-4) 0%, transparent 60%),
    radial-gradient(ellipse 80% 30% at 50% 100%, var(--hill-2) 0%, transparent 65%),
    var(--cream);
  opacity:0.55;
}

.container{ max-width: 1240px; margin:0 auto; padding: 1.75rem clamp(1rem, 4vw, 2.5rem) 4rem; }

a{ color: var(--accent-deep); }

/* ---------------------------------------------------------------- nav */
.navbar{
  display:flex; justify-content:space-between; align-items:center; gap:1rem;
  flex-wrap:wrap; padding: 1.1rem 0; margin-bottom: 1.75rem;
}
.logo h1{
  font-family: var(--font-display);
  font-size: 1.55rem; font-weight: 600; letter-spacing: 0.01em;
  color: var(--ink); display:flex; align-items:center; gap:0.5rem;
}
.logo .tagline{ font-size:0.72rem; color: var(--ink-soft); letter-spacing:0.04em; margin-top:0.15rem; }

.nav-links{ display:flex; gap:0.4rem; flex-wrap:wrap; }
.nav-btn{
  background: var(--paper); border: 1px solid var(--border);
  padding: 0.5rem 1rem; border-radius: 999px; font-family: var(--font-body);
  font-size: 0.85rem; font-weight: 600; cursor:pointer; color: var(--ink-soft);
  transition: all .2s ease; box-shadow: var(--shadow-sm);
}
.nav-btn:hover{ color: var(--ink); transform: translateY(-1px); }
.nav-btn.active{ background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------------------------------------------------------------- buttons */
.btn{
  font-family: var(--font-body); font-weight: 700; font-size: 0.92rem;
  padding: 0.7rem 1.5rem; border-radius: 999px; border: 1px solid var(--border);
  background: var(--paper); color: var(--ink); cursor:pointer;
  transition: all .2s ease; box-shadow: var(--shadow-sm);
}
.btn:hover{ transform: translateY(-2px); box-shadow: var(--shadow); }
.btn:active{ transform: translateY(0); }
.btn-primary{
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #fff; border:none;
}
.btn-outline{ background: transparent; border: 1.5px solid var(--ink); }
.btn-danger{ background: #C75C5C; color:#fff; border:none; }
.btn:disabled{ opacity:0.55; cursor:not-allowed; transform:none; }
.btn-block{ width:100%; }

/* ---------------------------------------------------------------- cards */
.card{
  background: var(--paper); border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 2rem); border: 1px solid var(--border);
  margin-bottom: 1.5rem; box-shadow: var(--shadow-sm);
}
.card h2{ font-family: var(--font-display); font-size: 1.6rem; font-weight:600; margin-bottom:0.6rem; }
.card h3{ font-family: var(--font-display); font-size: 1.2rem; font-weight:600; margin-bottom:0.85rem; }

.grid-2, .grid-3, .grid-7{ display:grid; gap: 1.25rem; }
.grid-2{ grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-3{ grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-7{ grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }

/* ---------------------------------------------------------------- forms */
label.field-label{ display:block; font-size:0.78rem; font-weight:700; color:var(--ink-soft); margin-bottom:0.35rem; text-transform:uppercase; letter-spacing:0.04em; }
input, select, textarea{
  background: var(--cream); border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  padding: 0.7rem 1rem; color: var(--ink); width:100%; font-family: var(--font-body);
  font-size: 0.95rem; transition: border-color .2s ease, box-shadow .2s ease;
}
input:focus, select:focus, textarea:focus{
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft);
}
textarea{ resize: vertical; min-height: 100px; }

.field-group{ margin-bottom: 1rem; }
.helper-text{ font-size:0.78rem; color: var(--ink-soft); margin-top:0.3rem; }

/* ---------------------------------------------------------------- progress */
.progress-bar{ height: 10px; background: var(--cream-deep); border-radius: 999px; overflow:hidden; margin: 0.6rem 0; }
.progress-fill{ height:100%; background: linear-gradient(90deg, var(--hill-3), var(--accent)); width:0%; border-radius:999px; transition: width 0.8s cubic-bezier(.22,1,.36,1); }

/* ---------------------------------------------------------------- badge / chip */
.badge{
  background: var(--cream-deep); color: var(--ink); padding: 0.3rem 0.85rem;
  border-radius: 999px; font-size: 0.78rem; font-weight:700; display:inline-block;
  border: 1px solid var(--border);
}
.badge.success{ background:#E4F0E6; color:#4F7A5C; border-color:#CDE3D2; }
.badge.warn{ background:#F6EBD9; color:#A1742F; border-color:#EFDDBE; }
.badge.danger{ background:#F7E4E4; color:#B6504F; border-color:#F0CFCF; }
.badge-hill{
  cursor:pointer; transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
  background: var(--accent-soft); border-color: var(--accent); color: var(--accent-deep);
  box-shadow: 0 2px 6px rgba(217,142,91,0.25);
  display:inline-flex; align-items:center; gap:0.4rem;
}
.badge-hill:hover{ background: var(--accent); color:#fff; transform: translateY(-2px); box-shadow: 0 4px 10px rgba(217,142,91,0.4); }
.badge-hill:hover .badge-hill-play{ background:#fff; color: var(--accent-deep); }
.badge-hill-play{
  display:inline-flex; align-items:center; justify-content:center;
  width:16px; height:16px; border-radius:50%; background: var(--accent-deep); color:#fff;
  font-size:0.6em; line-height:1; padding-left:1px; flex-shrink:0;
}

/* ---------------------------------------------------------------- pages */
.page{ display:none; animation: fadeIn .45s ease; }
.page.active{ display:block; }

/* ===== Faculty sub-navigation (splits Lecturer Hub into separate tracks) ===== */
.subnav{
  display:flex; flex-wrap:wrap; gap:0.4rem;
  background: var(--cream-deep); border-radius: var(--radius-md);
  padding: 0.5rem; margin-bottom: 1.25rem;
  position: sticky; top: 0.5rem; z-index: 5;
}
.subnav-btn{
  font-family: var(--font-body); font-size:0.85rem; font-weight:600;
  padding:0.5rem 0.85rem; border-radius: var(--radius-sm); border:1px solid transparent;
  background: transparent; color: var(--ink-soft); cursor:pointer; transition: all .15s ease;
}
.subnav-btn:hover{ color: var(--ink); background: var(--paper); }
.subnav-btn.active{ background: var(--accent); color:#fff; }
.faculty-section{ display:none; }
.faculty-section.active{ display:block; animation: fadeIn .35s ease; }

/* ===== Footer admin portal link (intentionally low-key, not in main nav) ===== */
.footer-admin-link{
  display:inline-block; margin-top:0.5rem; font-size:0.78rem;
  color: var(--ink-soft); opacity:0.6; text-decoration:underline;
}
.footer-admin-link:hover{ opacity:1; }

/* ===== Chart containers (Chart.js canvases) ===== */
.chart-box{ position:relative; height:260px; margin: 0.75rem 0 1rem; }
@keyframes fadeIn{ from{ opacity:0; transform: translateY(8px); } to{ opacity:1; transform:none; } }

/* ---------------------------------------------------------------- hero */
.hero{
  text-align:center; padding: clamp(2rem, 6vw, 4rem) 1rem 3rem; position:relative;
}
.hero .eyebrow{
  font-size:0.78rem; letter-spacing:0.18em; text-transform:uppercase; color: var(--accent-deep);
  font-weight:700; margin-bottom:0.9rem;
}
.hero h1{
  font-family: var(--font-display); font-size: clamp(2.1rem, 5vw, 3.4rem);
  font-weight:600; line-height:1.15; margin-bottom: 1rem; color: var(--ink);
}
.hero p.lead{ font-size:1.05rem; color: var(--ink-soft); max-width:620px; margin: 0 auto 1.75rem; }

/* ---------------------------------------------------------------- Seven Hills signature ridge */
.ridge{
  position: relative; height: 190px; max-width: 920px; margin: 1.5rem auto 0;
}
.ridge svg{ width:100%; height:100%; display:block; }
.ridge .hill-label{
  position:absolute; bottom: 8px; transform: translateX(-50%);
  font-size: 0.68rem; font-weight:700; color: var(--ink); text-align:center;
  width: 110px; line-height:1.25;
}
.ridge .hill-num{
  display:block; font-family: var(--font-display); font-size:1rem; color: var(--accent-deep);
}

/* ---------------------------------------------------------------- testimonials */
.testimonial{
  background: var(--cream-deep); border-radius: var(--radius-md); padding: 1.25rem;
  border: 1px solid var(--border); position:relative;
}
.testimonial p.quote{ font-style: italic; margin-bottom:0.6rem; }
.testimonial .author{ font-size:0.82rem; font-weight:700; color: var(--ink-soft); }

/* ---------------------------------------------------------------- video / lecture cards */
.video-grid{ display:grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.1rem; }
.video-card{
  background: var(--cream-deep); border-radius: var(--radius-md); overflow:hidden;
  border: 1px solid var(--border); transition: transform .25s ease, box-shadow .25s ease;
}
.video-card:hover{ transform: translateY(-4px); box-shadow: var(--shadow); }
.video-card iframe{ width:100%; aspect-ratio:16/9; border:0; display:block; }
.video-card .info{ padding: 0.85rem 1rem; }
.video-card .info strong{ display:block; font-size:0.92rem; margin-bottom:0.25rem; }
.video-card .info .meta{ font-size:0.78rem; color: var(--ink-soft); }

/* ---------------------------------------------------------------- quiz */
.quiz-item{
  background: var(--cream-deep); border-radius: var(--radius-md); padding: 1rem 1.1rem;
  margin-bottom: 0.9rem; border:1px solid var(--border);
}
.quiz-item .q-meta{ font-size:0.72rem; text-transform:uppercase; letter-spacing:0.06em; color: var(--accent-deep); font-weight:700; margin-bottom:0.3rem; }
.quiz-item .q-text{ font-weight:700; margin-bottom:0.6rem; }
.quiz-option{
  display:flex; align-items:center; gap:0.6rem; padding: 0.5rem 0.7rem; border-radius: var(--radius-sm);
  cursor:pointer; transition: background .15s ease;
}
.quiz-option:hover{ background: rgba(217,142,91,0.08); }
.quiz-option input{ width:auto; accent-color: var(--accent); }

/* ---------------------------------------------------------------- flex / layout helpers */
.flex-between{ display:flex; justify-content:space-between; align-items:center; gap:1rem; flex-wrap:wrap; }
.flex-row{ display:flex; gap:0.75rem; flex-wrap:wrap; align-items:center; }
.mt-1{ margin-top:0.5rem; } .mt-2{ margin-top:1rem; } .mt-3{ margin-top:1.5rem; }
hr.divider{ border:none; border-top:1px solid var(--border); margin: 1.5rem 0; }

/* ---------------------------------------------------------------- empty state */
.empty-state{
  text-align:center; padding: 2.25rem 1rem; color: var(--ink-soft);
  border: 1.5px dashed var(--border); border-radius: var(--radius-md);
}
.empty-state .icon{ font-size:1.8rem; margin-bottom:0.5rem; display:block; }

/* ---------------------------------------------------------------- pricing */
.price-card{ text-align:center; display:flex; flex-direction:column; }
.price-card .price{ font-family: var(--font-display); font-size:2rem; font-weight:600; margin: 0.5rem 0; }
.price-card ul{ list-style:none; text-align:left; margin: 1rem 0; flex-grow:1; }
.price-card li{ padding: 0.3rem 0; font-size:0.9rem; }
.price-card.featured{ border: 2px solid var(--accent); position:relative; }
.price-card.featured::before{
  content:"Most popular"; position:absolute; top:-12px; left:50%; transform:translateX(-50%);
  background: var(--accent); color:#fff; font-size:0.68rem; font-weight:700; padding:0.25rem 0.9rem;
  border-radius:999px; letter-spacing:0.05em;
}

/* ---------------------------------------------------------------- error atlas */
.atlas-item{ padding: 0.9rem 0; border-bottom: 1px solid var(--border); }
.atlas-item:last-child{ border-bottom:none; }
.atlas-item .topic-row{ font-weight:700; margin-bottom:0.3rem; }
.atlas-item .remedy{ font-size:0.88rem; color: var(--ink-soft); }

/* ---------------------------------------------------------------- toast */
#toast{
  position: fixed; bottom: 24px; left:50%; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: var(--paper); padding: 0.75rem 1.4rem; border-radius: 999px;
  font-size: 0.88rem; font-weight:600; box-shadow: var(--shadow); opacity:0; pointer-events:none;
  transition: all .3s ease; z-index: 999; max-width: 90vw; text-align:center;
}
#toast.show{ opacity:1; transform: translateX(-50%) translateY(0); }
#toast.error{ background: #B6504F; }
#toast.success{ background: #4F7A5C; }

/* ---------------------------------------------------------------- loading spinner */
.spinner{
  width:22px; height:22px; border-radius:50%; border:3px solid var(--border);
  border-top-color: var(--accent); animation: spin .8s linear infinite; margin: 0 auto;
}
@keyframes spin{ to{ transform: rotate(360deg); } }
.loading-row{ display:flex; justify-content:center; padding: 1.5rem; }

/* ---------------------------------------------------------------- footer */
.site-footer{ text-align:center; color: var(--ink-soft); font-size:0.82rem; padding-top: 1rem; }

@media (max-width: 700px){
  .container{ padding: 1.25rem; }
  .ridge{ height: 130px; }
  .ridge .hill-label{ width: 70px; font-size:0.58rem; }
}

/* ---------------------------------------------------------------- Physics Student Module */
.stat-tile-grid{ display:grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap:0.9rem; margin-top:0.5rem; }
.stat-tile{
  background: var(--cream-deep); border-radius: var(--radius-md); padding: 0.9rem 1rem;
  border: 1px solid var(--border); text-align:center;
}
.stat-tile .stat-value{ font-family: var(--font-display); font-size:1.5rem; font-weight:600; color: var(--ink); }
.stat-tile .stat-label{ font-size:0.72rem; color: var(--ink-soft); text-transform:uppercase; letter-spacing:0.04em; margin-top:0.2rem; }

.topic-group{ border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom:0.9rem; overflow:hidden; }
.topic-group-header{
  display:flex; justify-content:space-between; align-items:center; padding: 0.85rem 1.1rem;
  background: var(--cream-deep); cursor:pointer; font-weight:700;
}
.topic-group-body{ padding: 0 1.1rem 1.1rem; display:none; }
.topic-group.open .topic-group-body{ display:block; }
.topic-group.open .topic-group-header .chevron{ transform: rotate(90deg); }
.topic-group-header .chevron{ transition: transform .2s ease; color: var(--ink-soft); }

.term-tabs{ display:flex; gap:0.4rem; margin: 0.9rem 0 0.7rem; flex-wrap:wrap; }
.term-tab{
  background: var(--paper); border: 1px solid var(--border); border-radius: 999px;
  padding: 0.4rem 0.9rem; font-size:0.8rem; font-weight:700; cursor:pointer; color: var(--ink-soft);
}
.term-tab.active{ background: var(--ink); color: var(--paper); border-color: var(--ink); }

.material-row{
  display:flex; justify-content:space-between; align-items:center; gap:0.8rem;
  padding: 0.7rem 0.85rem; border-radius: var(--radius-sm); background: var(--paper);
  border: 1px solid var(--border); margin-bottom: 0.5rem; flex-wrap:wrap;
}
.material-row .material-title{ font-weight:700; font-size:0.9rem; }
.material-row .material-desc{ font-size:0.82rem; color: var(--ink-soft); margin-top:0.2rem; }

.proficiency-badge.Beginner{ background:#F7E4E4; color:#B6504F; border-color:#F0CFCF; }
.proficiency-badge.Intermediate{ background:#F6EBD9; color:#A1742F; border-color:#EFDDBE; }
.proficiency-badge.Advanced{ background:#E4F0E6; color:#4F7A5C; border-color:#CDE3D2; }

.rec-item{ border-bottom: 1px solid var(--border); padding: 0.9rem 0; }
.rec-item:last-child{ border-bottom:none; }
.rec-item .rec-msg{ font-weight:700; margin-bottom:0.4rem; }
.rec-item ul{ margin: 0.3rem 0 0 1.1rem; font-size:0.88rem; color: var(--ink-soft); }

/* ===================== Test-taking interface ===================== */
.test-modal-overlay{
  display:flex; flex-direction:column; align-items:center;
  padding: 2vh 1rem;
}
.test-modal-panel{
  width:100%; max-width:min(1100px, 96vw);
  height:96vh; display:flex; flex-direction:column;
  background: var(--paper); border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
  overflow:hidden;
}
.test-modal-header{
  display:flex; justify-content:space-between; align-items:center;
  padding: 1.25rem 2rem; border-bottom: 1px solid var(--border);
  background: var(--paper); flex-shrink:0; gap:1rem; flex-wrap:wrap;
}
.test-modal-header h2{ margin:0; font-size:1.3rem; }
.test-modal-progress{ font-size:0.85rem; color: var(--ink-soft); margin-top:0.2rem; }
.test-modal-body{
  flex:1; overflow-y:auto; padding: 1.75rem 2rem 2.5rem;
}
.test-question-card{
  margin-bottom: 1.5rem; padding: 1.5rem; border: 1px solid var(--border);
  border-radius: var(--radius-md); background: var(--paper);
  transition: border-color 0.15s ease;
}
.test-question-card.answered{ border-color: var(--accent-soft); background: #FFFDF6; }
.test-question-meta{
  font-size:0.78rem; color: var(--ink-soft); margin-bottom:0.75rem;
  display:flex; gap:0.6rem; flex-wrap:wrap;
}
.test-question-meta span{
  background: var(--cream-deep, #F3EEE3); padding:0.15rem 0.6rem; border-radius:999px;
}
.test-question-text{
  margin: 0 0 1.1rem; font-weight:600; font-size:1.05rem; line-height:1.5;
}
.test-options{ display:flex; flex-direction:column; gap:0.6rem; }
.test-option-row{
  display:flex; align-items:center; gap:0.85rem;
  padding: 0.75rem 1rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border); cursor:pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}
.test-option-row:hover{ background: var(--accent-soft); border-color: var(--accent); }
.test-option-row input[type="radio"]{
  flex-shrink:0; width:1.15rem; height:1.15rem; accent-color: var(--accent-deep);
  margin:0; cursor:pointer;
}
.test-option-row .opt-letter{ font-weight:700; color: var(--accent-deep); flex-shrink:0; }
.test-option-row .opt-text{ flex:1; line-height:1.4; }
.test-option-row.selected{ background: var(--accent-soft); border-color: var(--accent-deep); }
@media (max-width: 640px){
  .test-modal-panel{ height:100vh; border-radius:0; }
  .test-modal-header{ padding: 1rem 1.25rem; }
  .test-modal-body{ padding: 1.25rem 1.25rem 2rem; }
  .test-question-card{ padding:1.1rem; }
}