:root {
  --color-primary: #2563eb;
  --color-accent: #10b981;
  --color-warning: #f59e0b;
  --color-bg: #f8fafc;
  --color-card: #ffffff;
  --color-text: #0f172a;
  --color-muted: #475569;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  --radius: 12px;
  --transition: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.5;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.fade-in {
  animation: fadeIn 0.4s ease both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-card);
  border-bottom: 1px solid #dbeafe;
  padding: 12px 16px;
}

.header-top {
  display: flex;
  align-items: center;
  gap: 8px;
}

h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stage-indicator {
  margin: 0 0 0 auto;
  font-weight: 600;
  color: var(--color-muted);
}

.subtitle {
  margin: 8px 0;
  color: var(--color-muted);
}

.menu-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid #bfdbfe;
  border-radius: 10px;
  background: #eff6ff;
  cursor: pointer;
}

.stage-nav {
  display: none;
  gap: 8px;
  flex-direction: column;
}

.stage-nav.open {
  display: flex;
}

.stage-dot {
  min-height: 44px;
  border: 1px solid #bfdbfe;
  border-radius: 10px;
  background: #eff6ff;
  color: #1e3a8a;
  text-align: left;
  padding: 8px 10px;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition);
}

.stage-dot:hover,
.stage-dot:focus-visible {
  background: #dbeafe;
}

.stage-dot.active {
  background: var(--color-primary);
  color: #fff;
}

.progress-wrap {
  margin-top: 10px;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 25%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--transition);
}

.content {
  padding: 16px;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

.stage {
  display: none;
  animation: fadeIn 0.3s ease both;
}

.stage.active {
  display: block;
}

h2 {
  font-size: 1.35rem;
  margin: 8px 0 16px;
}

h3 {
  margin-top: 0;
}

.card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 14px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.11);
}

.card-grid {
  display: grid;
  gap: 12px;
}

/* В Этапе 2 уровни всегда идут последовательно */
section[data-stage="1"] .card-grid {
  grid-template-columns: 1fr;
}

.level-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.level-tab {
  min-height: 44px;
  border: 1px solid #bfdbfe;
  border-radius: 10px;
  background: #eff6ff;
  color: #1e3a8a;
  font-weight: 600;
  cursor: pointer;
}

.level-tab.active {
  background: var(--color-primary);
  color: #fff;
}

section[data-stage="1"] .level-card {
  display: none;
}

section[data-stage="1"] .level-card.active {
  display: block;
}

.reminders-grid .mini-card {
  border-left: 4px solid var(--color-primary);
}

.mini-card {
  background: #f1f5f9;
  padding: 12px;
  border-radius: 10px;
}

.banner-warning {
  border-left: 6px solid var(--color-warning);
  background: #fffbeb;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
  font-size: 0.95rem;
}

th,
td {
  border: 1px solid #cbd5e1;
  padding: 8px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #e0f2fe;
}

.quote,
.formula {
  background: #ecfeff;
  padding: 10px;
  border-radius: 8px;
}

.prompt-box pre,
.prompt-builder pre,
#randomPromptOutput,
#extendedPrompt {
  white-space: pre-wrap;
  word-break: break-word;
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 10px;
  padding: 12px;
  font-size: 0.95rem;
}

.btn {
  min-height: 44px;
  border: none;
  border-radius: 10px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  padding: 10px 14px;
  cursor: pointer;
  transition: transform var(--transition), opacity var(--transition), background var(--transition);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  opacity: 0.95;
}

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

.btn.copied {
  background: var(--color-accent);
}

.copy-status {
  display: inline-block;
  margin-top: 6px;
  color: #047857;
  font-weight: 600;
  min-height: 22px;
}

.builder-grid {
  display: grid;
  gap: 10px;
}

.prompt-builder-v2 {
  display: grid;
  gap: 14px;
}

.builder-section {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid #dbeafe;
  border-radius: 12px;
  background: #f8fbff;
}

.builder-section h5 {
  margin: 0;
  color: #1e40af;
  font-size: 1rem;
}

.builder-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.builder-option {
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: 999px;
  white-space: normal;
  line-height: 1.25;
  text-align: left;
}

.builder-option.active {
  background: #1d4ed8;
  border-color: #1d4ed8;
  color: #fff;
}

.prompt-builder-v2 .builder-section input[type="text"] {
  width: 100%;
  box-sizing: border-box;
}

.embed-wrap {
  margin-top: 10px;
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
}

.embed-wrap iframe {
  display: block;
  width: 100%;
  min-height: 520px;
  border: 0;
}

#stage1PromptFrame {
  min-height: 80vh;
}

#stage3PromptFrame {
  min-height: 80vh;
}

#stage4PromptFrame {
  min-height: 80vh;
}

.builder-grid label {
  display: grid;
  gap: 4px;
  font-weight: 600;
}

input[type="text"] {
  min-height: 44px;
  border: 1px solid #94a3b8;
  border-radius: 10px;
  padding: 10px;
  font: inherit;
}

textarea {
  width: 100%;
  border: 1px solid #94a3b8;
  border-radius: 10px;
  padding: 10px;
  font: inherit;
  resize: vertical;
}

.stage4-builder {
  display: grid;
  gap: 12px;
}

.stage4-option-group {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 10px;
}

.artifact-types {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.artifact-chip {
  min-height: 40px;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  background: #eff6ff;
  color: #1e3a8a;
  padding: 8px 12px;
  cursor: pointer;
}

.artifact-chip.active {
  background: var(--color-primary);
  color: #fff;
}

.checkbox-grid {
  display: grid;
  gap: 8px;
}

.checkbox-grid label {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.link-btn {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.checklist input[type="checkbox"] {
  width: 18px;
  height: 18px;
}

.nav-controls {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px 16px;
  position: sticky;
  bottom: 0;
  background: linear-gradient(180deg, rgba(248, 250, 252, 0.7), #f8fafc);
}

.nav-btn {
  flex: 1;
}

.app-footer {
  margin-top: auto;
  text-align: center;
  color: var(--color-muted);
  padding: 14px;
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }

  .stage-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  section[data-stage="1"] .card-grid {
    grid-template-columns: 1fr;
  }

  .level-tabs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .builder-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .stage-nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}