/* ============================================================
   CBM Evaluation Suite – METU ImageLab User Study Styles
   Red-white METU brand theme
   ============================================================ */

/* ── CSS Variables ── */
:root {
  /* METU brand */
  --metu-red:        #c1121f;
  --metu-red-dark:   #8b0000;
  --metu-red-mid:    #e85555;
  --metu-red-light:  #fdf0f0;
  --metu-red-pale:   #fce8e8;

  /* Surfaces */
  --bg:              #f5f5f7;
  --surface:         #ffffff;
  --border:          #e5e0e0;
  --border-red:      #f0cece;

  /* Text */
  --text-primary:    #1a1216;
  --text-muted:      #6b6070;

  /* CBM comparison colours – kept distinct for readability */
  --cbm-a:           #1d4ed8;   /* blue */
  --cbm-a-light:     #eff6ff;
  --cbm-a-mid:       #bfdbfe;

  --cbm-b:           #059669;   /* green */
  --cbm-b-light:     #ecfdf5;
  --cbm-b-mid:       #a7f3d0;

  /* Status */
  --correct-bg:      #dcfce7;
  --correct-fg:      #15803d;
  --wrong-bg:        #fee2e2;
  --wrong-fg:        #b91c1c;

  --radius:          10px;
  --shadow:          0 1px 4px rgba(0,0,0,.07), 0 4px 16px rgba(0,0,0,.05);
  --transition:      .2s ease;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ============================================================
   NAV BANNER
   ============================================================ */
.site-nav {
  background: var(--metu-red);
  color: white;
  padding: .6rem 1.5rem;
  display: flex;
  align-items: center;
  gap: .8rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
  position: sticky;
  top: 0;
  z-index: 200;
}

.nav-logo {
  height: 38px;
  width: auto;
  object-fit: contain;
  border-radius: 4px;
  background: white;
  padding: 2px 4px;
  flex-shrink: 0;
}

.nav-brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.nav-brand-top {
  font-size: .68rem;
  font-weight: 500;
  opacity: .85;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.nav-brand-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .01em;
}

.nav-spacer { flex: 1; }

.nav-tag {
  font-size: .75rem;
  font-weight: 600;
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 999px;
  padding: .2rem .7rem;
  letter-spacing: .04em;
}

/* ── Layout ── */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.container.narrow {
  max-width: 720px;
}

/* ── Progress bar ── */
.progress-bar-container {
  height: 4px;
  background: var(--border);
  position: sticky;
  top: 56px;   /* below nav */
  z-index: 100;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--metu-red), var(--metu-red-mid));
  transition: width .4s ease;
}

/* ── Cards ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

/* ── Header ── */
.study-header {
  text-align: center;
  padding: 2.5rem 0 2rem;
}
.study-header.compact {
  padding: 1rem 0 .5rem;
  text-align: left;
}
.study-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  margin: .75rem 0 .5rem;
}
.study-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: .5rem 0;
}
.subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
}
.logo-line { margin-bottom: .5rem; }

/* ── Badges ── */
.badge {
  display: inline-block;
  padding: .25rem .75rem;
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 600;
  background: var(--metu-red-pale);
  color: var(--metu-red-dark);
  letter-spacing: .03em;
}
.success-badge { background: #dcfce7; color: #15803d; }
.dataset-tag {
  display: inline-block;
  padding: .2rem .6rem;
  border-radius: 6px;
  font-size: .8rem;
  font-weight: 500;
  background: var(--border);
  color: var(--text-muted);
  margin-left: .5rem;
}
.progress-label { display: flex; align-items: center; margin-bottom: .5rem; }

/* ── Ground truth ── */
.gt-row {
  text-align: center;
  font-size: 1.05rem;
  margin-bottom: 1rem;
}
.gt-label { color: var(--text-muted); margin-right: .4rem; }
.gt-value {
  font-weight: 700;
  background: var(--metu-red-pale);
  color: var(--metu-red-dark);
  padding: .2rem .6rem;
  border-radius: 6px;
  font-family: monospace;
  font-size: 1rem;
  border: 1px solid var(--border-red);
}

/* ── Comparison grid ── */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1.2fr;
  gap: 1rem;
  align-items: start;
  margin-bottom: 1rem;
}

@media (max-width: 860px) {
  .comparison-grid { grid-template-columns: 1fr; }
}

/* ── Image column ── */
.image-col { text-align: center; }
.col-header {
  font-size: .85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.eval-image {
  max-width: 100%;
  max-height: 300px;
  border-radius: 8px;
  object-fit: contain;
  border: 1px solid var(--border);
}
.image-placeholder {
  background: var(--bg);
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 2rem 1rem;
  color: var(--text-muted);
}
.placeholder-icon { font-size: 2.5rem; display: block; margin-bottom: .5rem; }
.placeholder-text { font-size: .8rem; word-break: break-all; }
.placeholder-note { font-size: .75rem; margin-top: .25rem; }

/* ── CBM columns ── */
.cbm-col {
  transition: box-shadow var(--transition), border-color var(--transition);
}
.cbm-col.selected.cbm-a-card {
  border-color: var(--cbm-a);
  box-shadow: 0 0 0 3px rgba(29,78,216,.2), var(--shadow);
}
.cbm-col.selected.cbm-b-card {
  border-color: var(--cbm-b);
  box-shadow: 0 0 0 3px rgba(5,150,105,.2), var(--shadow);
}

.cbm-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.2rem;
  padding-bottom: .75rem;
  border-bottom: 2px solid var(--border);
}
.cbm-a-header { border-bottom-color: var(--cbm-a-mid); }
.cbm-b-header { border-bottom-color: var(--cbm-b-mid); }
.cbm-header h3 { font-size: 1.1rem; font-weight: 700; }

/* "Predicted class:" label + badge wrapper */
.pred-line {
  display: flex;
  align-items: center;
  gap: .45rem;
}
.pred-label {
  font-size: .75rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}


/* ── Prediction badge ── */
.pred-badge {
  display: inline-block;
  padding: .25rem .6rem;
  border-radius: 6px;
  font-size: .82rem;
  font-weight: 600;
  font-family: monospace;
}
.pred-badge.correct { background: var(--correct-bg); color: var(--correct-fg); }
.pred-badge.incorrect { background: var(--wrong-bg); color: var(--wrong-fg); }

/* ── Concept list ── */
.concept-list { margin-bottom: 1.25rem; }
.concept-item { margin-bottom: .75rem; }
.concept-name-row {
  display: flex;
  align-items: baseline;
  gap: .4rem;
  margin-bottom: .2rem;
}
.concept-rank {
  font-size: .72rem;
  font-weight: 700;
  color: var(--text-muted);
  min-width: 1rem;
}
.concept-name {
  font-size: .9rem;
  font-weight: 500;
  flex: 1;
  word-break: break-word;
}
.concept-weight {
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-muted);
  font-family: monospace;
}
.concept-bar-bg {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.concept-bar {
  height: 100%;
  border-radius: 3px;
  width: 0;
  transition: width .6s ease;
}
.cbm-a-bar { background: var(--cbm-a); }
.cbm-b-bar { background: var(--cbm-b); }

/* ── Choice labels ── */
.cbm-choice-label { display: block; cursor: pointer; }
.cbm-choice-label input[type="radio"] { display: none; }
.choice-btn {
  display: block;
  text-align: center;
  padding: .65rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: .9rem;
  border: 2px solid var(--border);
  background: var(--bg);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
input[type="radio"]:checked + .cbm-a-btn {
  background: var(--cbm-a-light);
  border-color: var(--cbm-a);
  color: var(--cbm-a);
}
input[type="radio"]:checked + .cbm-b-btn {
  background: var(--cbm-b-light);
  border-color: var(--cbm-b);
  color: var(--cbm-b);
}
.choice-btn:hover { border-color: #9ca3af; }

/* ── Form footer ── */
.form-footer { padding: 1.25rem 1.5rem; }
.tie-label {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .95rem;
  margin-bottom: 1rem;
  cursor: pointer;
}
.tie-label input { accent-color: var(--metu-red); }

.comment-section { margin-bottom: 1rem; }
.comment-section label {
  display: block;
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: .3rem;
}
.comment-section textarea {
  width: 100%;
  padding: .5rem .75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .9rem;
  resize: vertical;
  background: var(--bg);
  font-family: inherit;
}
.comment-section textarea:focus {
  outline: none;
  border-color: var(--metu-red);
  background: white;
}

.submit-row { text-align: right; }

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: .65rem 1.5rem;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: opacity var(--transition), transform var(--transition);
}
.btn:hover { opacity: .88; transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--metu-red), var(--metu-red-dark));
  color: white;
}
.btn-secondary {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-primary);
}
.btn-large { padding: .85rem 2.5rem; font-size: 1.05rem; }
.cta-row { text-align: center; margin-top: 2rem; }

/* ── Instructions page ── */
.instructions-card { margin-bottom: 1rem; }
.instructions-card h2 {
  font-size: 1.1rem;
  margin-bottom: .75rem;
  color: var(--metu-red-dark);
}
.instructions-card p { color: var(--text-muted); margin-bottom: .6rem; font-size: .95rem; }
.instructions-card ol, .instructions-card ul { padding-left: 1.2rem; }
.instructions-card li { color: var(--text-muted); margin-bottom: .3rem; font-size: .95rem; }

.criteria-list { list-style: none; padding: 0 !important; }
.criteria-list li {
  display: flex;
  gap: .75rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--border);
  margin: 0 !important;
}
.criteria-list li:last-child { border-bottom: none; }
.criterion-icon { font-size: 1.2rem; flex-shrink: 0; }

/* highlight card divider accent */
.card { border-top: 3px solid transparent; }
.instructions-card { border-top-color: var(--metu-red); }

/* ── Done page ── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.summary-tile {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem;
  text-align: center;
}
.total-tile  { background: var(--metu-red-pale); border-color: var(--border-red); border-top: 3px solid var(--metu-red); }
.cbm-a-tile  { background: var(--cbm-a-light); border-color: var(--cbm-a-mid); }
.cbm-b-tile  { background: var(--cbm-b-light); border-color: var(--cbm-b-mid); }
.tie-tile    { background: #fafafa; }
.tile-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: .3rem;
  color: var(--metu-red-dark);
}
.cbm-a-tile .tile-value { color: var(--cbm-a); }
.cbm-b-tile .tile-value { color: var(--cbm-b); }
.tile-label {
  font-size: .8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .05em;
}