/* ═══════════════════════════════════════════
   EDUAGENT — style.css
   Aesthetic: Editorial / Industrial Minimal
   Palette: Off-white + Deep charcoal + Electric amber
═══════════════════════════════════════════ */

/* ── Tokens ── */
:root {
  --bg:         #0d0d0d;
  --bg-panel:   #141414;
  --bg-panel2:  #1a1a1a;
  --border:     #2a2a2a;
  --border-hi:  #3f3f3f;
  --text:       #e8e4dc;
  --text-muted: #7a7570;
  --text-dim:   #4a4744;
  --accent:     #f5a623;
  --accent-dim: #8a5c0e;
  --green:      #3ecf6e;
  --red:        #e05252;
  --gen-clr:    #7c9ef5;
  --rev-clr:    #f5a623;
  --ref-clr:    #3ecf6e;

  --font-display: 'Syne', sans-serif;
  --font-body:    'Lora', serif;
  --font-mono:    'DM Mono', monospace;

  --radius:  6px;
  --radius-lg: 12px;
  --gap:     1.5rem;
  --panel-pad: 2rem 2.25rem;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Background grid ── */
.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.35;
  z-index: 0;
}

/* ── Header ── */
.site-header {
  position: relative;
  z-index: 10;
  padding: 2.5rem 3rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-bracket { color: var(--accent); }
.logo-text    { color: var(--text); }

.logo-sub {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* ── Main ── */
.main {
  position: relative;
  z-index: 5;
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 2rem 6rem;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

/* ── Panels ── */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--panel-pad);
  position: relative;
  overflow: hidden;
}

.panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.015) 0%, transparent 60%);
  pointer-events: none;
}

.panel-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.panel-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

/* ── Control panel form ── */
.form-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.field-group { display: flex; flex-direction: column; gap: 0.4rem; }
.field-group--wide { flex: 1; min-width: 220px; }

.field-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.field-input {
  background: var(--bg-panel2);
  border: 1px solid var(--border-hi);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 0.65rem 0.9rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}

.field-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(245,166,35,0.12);
}

#grade-input { width: 90px; }

/* ── Run button ── */
.run-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: #0d0d0d;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.75rem 1.6rem;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: 0 0 0 0 rgba(245,166,35,0);
}

.run-btn:hover {
  background: #ffbb47;
  box-shadow: 0 4px 24px rgba(245,166,35,0.25);
  transform: translateY(-1px);
}

.run-btn:active { transform: translateY(0); }

.run-btn:disabled {
  background: var(--text-dim);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.run-btn__icon {
  font-size: 0.75rem;
  transition: transform 0.2s;
}

.run-btn:not(:disabled):hover .run-btn__icon { transform: translateX(3px); }

/* ── Progress track ── */
.pipeline { display: flex; flex-direction: column; gap: var(--gap); }

.progress-track {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.75rem 1.5rem;
  overflow: hidden;
}

.progress-step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  transition: color 0.3s;
  flex-shrink: 0;
}

.progress-step.active  { color: var(--text); }
.progress-step.done    { color: var(--green); }
.progress-step.skipped { color: var(--text-dim); }

.step-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: background 0.3s, box-shadow 0.3s;
  flex-shrink: 0;
}

.progress-step.active  .step-dot { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.progress-step.done    .step-dot { background: var(--green);  box-shadow: 0 0 8px var(--green); }
.progress-step.skipped .step-dot { background: var(--border); }

.progress-line {
  flex: 1;
  height: 1px;
  background: var(--border);
  margin: 0 0.5rem;
  transition: background 0.4s;
}

.progress-line.active { background: var(--accent); }
.progress-line.done   { background: var(--green); }

/* ── Stage panels ── */
.stage-panel {
  animation: fadeUp 0.4s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Stage accent bars */
.stage-panel::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px;
  height: 100%;
  border-radius: 999px;
}

#stage-generated::after { background: var(--gen-clr); }
#stage-review::after    { background: var(--rev-clr); }
#stage-refined::after   { background: var(--ref-clr); }

/* Stage tags */
.stage-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  display: inline-block;
}

.stage-tag--gen { color: var(--gen-clr); background: rgba(124,158,245,0.1); border: 1px solid rgba(124,158,245,0.2); }
.stage-tag--rev { color: var(--rev-clr); background: rgba(245,166,35,0.08); border: 1px solid rgba(245,166,35,0.2); }
.stage-tag--ref { color: var(--ref-clr); background: rgba(62,207,110,0.08); border: 1px solid rgba(62,207,110,0.2); }

/* ── Content block (explanation) ── */
.content-block {
  background: var(--bg-panel2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.content-block-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: block;
}

/* ── MCQ list ── */
.mcq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mcq-card {
  background: var(--bg-panel2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.mcq-number {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.mcq-question {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.mcq-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.mcq-option {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.mcq-option.correct {
  border-color: var(--green);
  color: var(--green);
  background: rgba(62,207,110,0.06);
}

.mcq-answer {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--green);
  letter-spacing: 0.06em;
}

/* ── Verdict ── */
.verdict {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.verdict.pass {
  background: rgba(62,207,110,0.1);
  border: 1px solid rgba(62,207,110,0.3);
  color: var(--green);
}

.verdict.fail {
  background: rgba(224,82,82,0.1);
  border: 1px solid rgba(224,82,82,0.3);
  color: var(--red);
}

/* ── Feedback list ── */
.feedback-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.feedback-list li {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  background: var(--bg-panel2);
  border-left: 2px solid var(--red);
  border-radius: 0 var(--radius) var(--radius) 0;
  line-height: 1.5;
}

.feedback-list.pass-list li {
  border-left-color: var(--green);
  color: var(--text-muted);
}

/* ── Refined review wrapper ── */
.refined-review {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--border-hi);
}

/* ── Loader ── */
.loader {
  position: fixed;
  inset: 0;
  background: rgba(13,13,13,0.85);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.loader-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.spinner {
  width: 40px; height: 40px;
  border: 2px solid var(--border-hi);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loader-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50%       { opacity: 1; }
}

/* ── Error banner ── */
.error-banner {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: #2a1010;
  border: 1px solid var(--red);
  color: var(--red);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: 200;
  max-width: 500px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.error-close {
  background: none;
  border: none;
  color: var(--red);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0;
  flex-shrink: 0;
}

/* ── Footer ── */
.site-footer {
  position: relative;
  z-index: 5;
  border-top: 1px solid var(--border);
  padding: 1.25rem 3rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  text-align: center;
}

/* ── Utilities ── */
.hidden { display: none !important; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .site-header { padding: 1.5rem; flex-direction: column; gap: 0.5rem; }
  .main { padding: 1.5rem 1rem 5rem; }
  .panel { padding: 1.25rem 1.25rem; }
  .mcq-options { grid-template-columns: 1fr; }
  #grade-input { width: 100%; }
  .form-row { flex-direction: column; }
  .progress-track { padding: 0.6rem 1rem; gap: 0.25rem; }
  .progress-step span { display: none; }
}