/* ==========================================================================
   УмКид — Diagnostics Page v2
   ========================================================================== */

/* --- Hero ----------------------------------------------------------------- */
.diag-hero {
  padding-top: calc(var(--nav-height) + var(--space-20));
  padding-bottom: var(--space-20);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.diag-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(55, 138, 221, 0.09), transparent 60%),
    radial-gradient(ellipse 40% 40% at 90% 80%, rgba(127, 119, 221, 0.06), transparent 50%);
  pointer-events: none;
}

.diag-hero-content {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
}

.diag-hero-title {
  font-size: clamp(36px, 5vw, 58px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-5);
}

.diag-hero-sub {
  font-size: 19px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-8);
}

.diag-hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-top: var(--space-8);
}

.diag-trust-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-muted);
}

.diag-trust-item-icon {
  color: var(--color-secondary);
  font-size: 15px;
}

/* --- How it works --------------------------------------------------------- */
.diag-how-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  position: relative;
}

.diag-how-steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(12.5% + 20px);
  right: calc(12.5% + 20px);
  height: 2px;
  background: linear-gradient(90deg,
    var(--color-primary) 0%,
    var(--color-purple) 50%,
    var(--color-secondary) 100%);
  opacity: 0.15;
}

.diag-step {
  text-align: center;
  position: relative;
}

.diag-step-circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin: 0 auto var(--space-4);
  position: relative;
  z-index: 1;
}

.diag-step-num {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 900;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(55, 138, 221, 0.4);
}

.diag-step-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.diag-step-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --- Sample knowledge card ------------------------------------------------ */
.knowledge-card-preview {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  overflow: hidden;
  max-width: 560px;
  margin: 0 auto;
}

.kc-header {
  padding: var(--space-6) var(--space-8);
  background: linear-gradient(135deg, #EBF4FF, #D6EAFF);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

[data-theme="dark"] .kc-header {
  background: linear-gradient(135deg, #16263C, #1A3050);
}

.kc-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  color: #fff;
  flex-shrink: 0;
}

.kc-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  color: var(--color-text);
}

.kc-meta {
  font-size: 13px;
  color: var(--color-text-muted);
}

.kc-body {
  padding: var(--space-6) var(--space-8);
}

/* Circular progress */
.kc-score-row {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border-subtle);
}

.kc-circle {
  position: relative;
  width: 88px;
  height: 88px;
  flex-shrink: 0;
}

.kc-circle svg {
  transform: rotate(-90deg);
}

.kc-circle-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.kc-circle-pct {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
}

.kc-circle-label {
  font-size: 10px;
  color: var(--color-text-muted);
  font-weight: 600;
}

.kc-score-info {}

.kc-score-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 4px;
}

.kc-score-sub {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Topics */
.kc-topics {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.kc-topic-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-3);
}

.kc-topic-info {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.kc-topic-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.kc-topic-name {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text);
}

.kc-topic-bar-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.kc-topic-bar {
  width: 80px;
  height: 6px;
  background: rgba(55, 138, 221, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.kc-topic-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 1.2s var(--ease-out-soft);
}

.kc-topic-pct {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  min-width: 30px;
  text-align: right;
}

/* Recommendation block */
.kc-recommend {
  padding: var(--space-4) var(--space-5);
  background: linear-gradient(135deg, rgba(55, 138, 221, 0.06), rgba(127, 119, 221, 0.04));
  border-radius: var(--radius-md);
  border: 1px solid rgba(55, 138, 221, 0.12);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.kc-recommend-text {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
}

.kc-recommend-sub {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* --- Demo Test ------------------------------------------------------------ */
.demo-test-card {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  overflow: hidden;
  max-width: 680px;
  margin: 0 auto;
}

.demo-header {
  padding: var(--space-6) var(--space-8);
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.demo-header-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.9);
}

.demo-progress-dots {
  display: flex;
  gap: var(--space-2);
}

.demo-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: background 0.3s ease;
}

.demo-dot.active {
  background: #fff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.demo-dot.done {
  background: rgba(255, 255, 255, 0.7);
}

.demo-body {
  padding: var(--space-8);
  min-height: 320px;
}

/* Demo step panels */
.demo-step {
  display: none;
  animation: fade-up 0.35s var(--ease-out-soft) both;
}

.demo-step.active {
  display: block;
}

.demo-step-label {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}

.demo-step-question {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: 1.3;
}

/* Grade buttons */
.demo-grade-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}

.demo-grade-btn {
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.2s var(--ease-out-soft);
  text-align: center;
}

.demo-grade-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(55, 138, 221, 0.05);
  transform: translateY(-2px);
}

.demo-grade-btn.selected {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-primary);
  transform: translateY(-2px);
}

/* Subject buttons */
.demo-subject-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.demo-subject-btn {
  padding: var(--space-5) var(--space-4);
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.2s var(--ease-out-soft);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.demo-subject-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.demo-subject-btn.selected {
  border-color: var(--color-primary);
  background: rgba(55, 138, 221, 0.07);
  color: var(--color-primary);
  box-shadow: var(--shadow-primary);
  transform: translateY(-3px);
}

.demo-subject-emoji {
  font-size: 28px;
  line-height: 1;
}

/* Q&A options */
.demo-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.demo-option {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.2s var(--ease-out-soft);
  text-align: left;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.demo-option:hover:not(.answered) {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(55, 138, 221, 0.04);
}

.demo-option.correct {
  border-color: var(--color-secondary);
  background: rgba(29, 158, 117, 0.08);
  color: var(--color-secondary);
}

.demo-option.incorrect {
  border-color: var(--color-coral);
  background: rgba(240, 107, 107, 0.08);
  color: var(--color-coral);
}

.demo-option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(55, 138, 221, 0.08);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 900;
  flex-shrink: 0;
  transition: background 0.2s ease, color 0.2s ease;
}

.demo-option.correct .demo-option-letter {
  background: var(--color-secondary);
  color: #fff;
}

.demo-option.incorrect .demo-option-letter {
  background: var(--color-coral);
  color: #fff;
}

.demo-feedback {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  display: none;
  animation: scale-in 0.3s var(--ease-back) both;
}

.demo-feedback.show { display: block; }

.demo-feedback.correct-fb {
  background: rgba(29, 158, 117, 0.1);
  color: var(--color-secondary);
  border: 1px solid rgba(29, 158, 117, 0.2);
}

.demo-feedback.incorrect-fb {
  background: rgba(239, 159, 39, 0.1);
  color: #c07d00;
  border: 1px solid rgba(239, 159, 39, 0.2);
}

/* Demo result */
.demo-result {
  text-align: center;
  padding: var(--space-4) 0;
}

.demo-result-score {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 88px;
  height: 88px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 900;
  color: #fff;
  margin: 0 auto var(--space-5);
  box-shadow: 0 8px 24px rgba(55, 138, 221, 0.35);
  animation: bounce-in 0.6s var(--ease-back) both;
}

.demo-result-title {
  font-size: 20px;
  font-weight: 900;
  margin-bottom: var(--space-3);
}

.demo-result-sub {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 380px;
  margin: 0 auto var(--space-6);
  line-height: 1.6;
}

.demo-mini-bars {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 320px;
  margin: 0 auto var(--space-6);
  text-align: left;
}

.demo-mini-bar-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
}

/* Demo footer */
.demo-footer {
  padding: var(--space-5) var(--space-8);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  background: rgba(55, 138, 221, 0.02);
}

.demo-question-counter {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-muted);
}

.demo-next-btn {
  display: none;
}

.demo-next-btn.show {
  display: inline-flex;
}

/* --- Responsive ----------------------------------------------------------- */
@media (max-width: 768px) {
  .diag-how-steps { grid-template-columns: 1fr 1fr; gap: var(--space-5); }
  .diag-how-steps::before { display: none; }
  .demo-grade-grid { grid-template-columns: repeat(4, 1fr); gap: var(--space-2); }
  .demo-subject-grid { grid-template-columns: repeat(3, 1fr); }
  .demo-options-grid { grid-template-columns: 1fr; }
  .demo-body { padding: var(--space-6); }
  .demo-footer { padding: var(--space-4) var(--space-6); }
  .demo-header { padding: var(--space-4) var(--space-6); }
  .kc-body { padding: var(--space-5); }
  .kc-header { padding: var(--space-5); }
  .kc-recommend { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .demo-grade-grid { grid-template-columns: repeat(4, 1fr); gap: var(--space-1); }
  .demo-grade-btn { padding: var(--space-3) var(--space-2); font-size: 14px; }
  .demo-subject-grid { grid-template-columns: repeat(2, 1fr); }
  .diag-hero-trust { gap: var(--space-4); }
  .kc-score-row { flex-direction: column; text-align: center; }
}