:root {
  --tut-bg: #061120;
  --tut-bg-soft: #0b1a31;
  --tut-surface: rgba(12, 24, 44, 0.9);
  --tut-surface-strong: rgba(15, 30, 55, 0.96);
  --tut-border: rgba(132, 170, 235, 0.18);
  --tut-border-strong: rgba(118, 169, 255, 0.36);
  --tut-text: #eff5ff;
  --tut-muted: #9eb0cf;
  --tut-brand: #76a9ff;
  --tut-brand-strong: #3d72ff;
  --tut-accent: #f4c95d;
  --tut-ok: #73deae;
  --tut-warn: #ffbd70;
  --tut-danger: #ff8f8f;
  --tut-radius: 22px;
  --tut-shadow: 0 32px 90px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", sans-serif;
  color: var(--tut-text);
  background:
    radial-gradient(circle at top left, rgba(61, 114, 255, 0.22), transparent 28%),
    radial-gradient(circle at 85% 10%, rgba(244, 201, 93, 0.08), transparent 18%),
    linear-gradient(180deg, #071322 0%, #061120 48%, #081629 100%);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

.tutorial-shell {
  width: min(1380px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.tutorial-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 18px;
  position: sticky;
  top: 12px;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(6, 17, 32, 0.74);
  border: 1px solid var(--tut-border);
  border-radius: 999px;
}

.tutorial-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tutorial-mark {
  width: 44px;
  height: 44px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-weight: 800;
  background: linear-gradient(145deg, #204fd7, #0d1a33);
  box-shadow: 0 12px 28px rgba(61, 114, 255, 0.24);
}

.tutorial-copy strong {
  display: block;
  font-size: 0.98rem;
}

.tutorial-copy span {
  color: var(--tut-muted);
  font-size: 0.86rem;
}

.tutorial-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tutorial-chip,
.tutorial-button,
.tutorial-button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 12px 18px;
  border: 1px solid var(--tut-border);
  transition: 0.18s ease;
}

.tutorial-chip {
  background: rgba(255, 255, 255, 0.03);
}

.tutorial-button {
  background: linear-gradient(135deg, var(--tut-brand-strong), #769dff);
  color: white;
  border-color: transparent;
  cursor: pointer;
}

.tutorial-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(61, 114, 255, 0.28);
}

.tutorial-button-secondary {
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
}

.tutorial-button-secondary:hover,
.tutorial-chip:hover {
  border-color: var(--tut-border-strong);
  background: rgba(118, 169, 255, 0.08);
}

.tutorial-hero {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
}

.tutorial-card,
.tutorial-panel,
.tutorial-slide,
.tutorial-visual,
.tutorial-quiz,
.tutorial-chat,
.tutorial-track-card,
.tutorial-progress-card,
.tutorial-user-card,
.tutorial-deck {
  background: var(--tut-surface);
  border: 1px solid var(--tut-border);
  border-radius: var(--tut-radius);
  box-shadow: var(--tut-shadow);
}

.tutorial-card,
.tutorial-panel,
.tutorial-progress-card,
.tutorial-track-card,
.tutorial-user-card {
  padding: 28px;
}

.tutorial-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(118, 169, 255, 0.14);
  color: #c4d8ff;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-size: 0.78rem;
}

.tutorial-card h1,
.tutorial-card h2,
.tutorial-panel h2,
.tutorial-slide h2,
.tutorial-quiz h2,
.tutorial-chat h2 {
  margin: 14px 0 10px;
  line-height: 1.04;
  letter-spacing: -0.03em;
}

.tutorial-card h1 {
  font-size: clamp(2.5rem, 5vw, 4.6rem);
}

.tutorial-card p,
.tutorial-panel p,
.tutorial-track-card p,
.tutorial-progress-card p,
.tutorial-user-card p,
.tutorial-slide p,
.tutorial-chat p,
.tutorial-quiz p {
  color: var(--tut-muted);
  line-height: 1.7;
}

.tutorial-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.tutorial-metric {
  border: 1px solid rgba(132, 170, 235, 0.14);
  border-radius: 18px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.02);
}

.tutorial-metric strong {
  display: block;
  font-size: 1.7rem;
  margin-bottom: 4px;
}

.tutorial-grid,
.tutorial-tracks,
.tutorial-progress-grid,
.tutorial-user-grid,
.tutorial-deck-grid {
  display: grid;
  gap: 18px;
}

.tutorial-grid {
  grid-template-columns: 1.1fr 0.9fr;
  margin-top: 22px;
}

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

.tutorial-progress-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.tutorial-track-card {
  position: relative;
  overflow: hidden;
}

.tutorial-track-card::after {
  content: "";
  position: absolute;
  inset: auto -40px -40px auto;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(118, 169, 255, 0.12), transparent 70%);
  pointer-events: none;
}

.chapter-list,
.bullet-list,
.visual-list,
.assistant-sources,
.quiz-list,
.user-status-list {
  display: grid;
  gap: 12px;
}

.chapter-item,
.visual-item,
.assistant-source,
.quiz-result,
.user-row {
  border: 1px solid rgba(132, 170, 235, 0.14);
  border-radius: 18px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.02);
}

.chapter-item {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.chapter-item.completed {
  border-color: rgba(115, 222, 174, 0.38);
}

.chapter-item.pending {
  border-color: rgba(255, 189, 112, 0.32);
}

.chapter-meta,
.pill-row,
.slide-nav,
.quiz-actions,
.tutorial-inline {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.tutorial-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid rgba(132, 170, 235, 0.16);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.82rem;
  color: #d2e2ff;
}

.tutorial-pill.ok {
  border-color: rgba(115, 222, 174, 0.38);
  color: #c5f3df;
}

.tutorial-pill.warn {
  border-color: rgba(255, 189, 112, 0.38);
  color: #ffd9aa;
}

.tutorial-pill.danger {
  border-color: rgba(255, 143, 143, 0.38);
  color: #ffc7c7;
}

.tutorial-progress-bar {
  position: relative;
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
  margin-top: 16px;
}

.tutorial-progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--tut-brand-strong), var(--tut-accent));
  width: 0%;
}

.tutorial-progress-meta {
  margin: 12px 0 0;
  color: var(--tut-muted);
  font-size: 0.9rem;
}

.tutorial-layout {
  display: grid;
  grid-template-columns: 0.76fr 1.24fr;
  gap: 18px;
  margin-top: 22px;
}

.tutorial-panel.sticky {
  position: sticky;
  top: 100px;
  align-self: start;
}

.tutorial-slide-wrap {
  display: grid;
  gap: 18px;
}

.tutorial-slide,
.tutorial-visual,
.tutorial-chat,
.tutorial-quiz {
  padding: 26px;
}

.tutorial-slide-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.tutorial-slide-title h2 {
  margin: 0;
  font-size: clamp(1.9rem, 3vw, 3rem);
}

.tutorial-slide-text {
  display: grid;
  gap: 14px;
}

.tutorial-visual {
  background:
    linear-gradient(180deg, rgba(118, 169, 255, 0.06), rgba(255, 255, 255, 0.02)),
    var(--tut-surface-strong);
}

.tutorial-visual-frame {
  border: 1px solid rgba(118, 169, 255, 0.22);
  border-radius: 20px;
  padding: 20px;
  background:
    linear-gradient(145deg, rgba(15, 30, 55, 0.95), rgba(10, 23, 43, 0.96));
}

.tutorial-visual-stage {
  position: relative;
  min-height: 280px;
}

.tutorial-screen,
.tutorial-phone-shell {
  border: 1px solid rgba(118, 169, 255, 0.2);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

.tutorial-screen {
  padding: 18px;
}

.tutorial-screen-band,
.tutorial-phone-bar {
  height: 12px;
  border-radius: 999px;
  background: rgba(118, 169, 255, 0.18);
  margin-bottom: 14px;
}

.tutorial-screen-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.tutorial-screen-card,
.tutorial-phone-card,
.tutorial-phone-item,
.tutorial-phone-qr,
.tutorial-chip-block {
  border: 1px solid rgba(118, 169, 255, 0.16);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.03);
}

.tutorial-screen-card {
  min-height: 92px;
  padding: 16px;
  display: flex;
  align-items: end;
  font-weight: 700;
  color: #d9e7ff;
}

.tutorial-screen-card.wide {
  grid-column: span 2;
}

.tutorial-screen-card.accent {
  background: rgba(244, 201, 93, 0.08);
}

.tutorial-phone-shell {
  width: min(300px, 100%);
  margin: 0 auto;
  padding: 16px;
}

.tutorial-phone-card {
  padding: 16px;
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
}

.tutorial-phone-card strong {
  font-size: 1.05rem;
}

.tutorial-phone-qr {
  min-height: 128px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  font-weight: 900;
  letter-spacing: 0.18em;
  color: #f7e1aa;
}

.tutorial-phone-inline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.tutorial-chip-block {
  padding: 12px;
  text-align: center;
  font-weight: 700;
}

.tutorial-phone-list {
  display: grid;
  gap: 10px;
}

.tutorial-phone-item {
  min-height: 56px;
}

.tutorial-pointer {
  position: absolute;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(244, 201, 93, 0.95), rgba(244, 201, 93, 0.18));
  box-shadow: 0 0 0 10px rgba(244, 201, 93, 0.08);
  top: 18px;
  left: 18px;
}

.tutorial-visual-stage.action-click .tutorial-pointer {
  animation: tutorial-pointer-click 2.2s ease-in-out infinite;
}

.tutorial-visual-stage.action-type .tutorial-pointer {
  animation: tutorial-pointer-type 2.6s ease-in-out infinite;
}

.tutorial-visual-stage.action-scan .tutorial-pointer {
  animation: tutorial-pointer-scan 2.4s ease-in-out infinite;
}

.tutorial-visual-stage.action-review .tutorial-pointer {
  animation: tutorial-pointer-review 2.6s ease-in-out infinite;
}

@keyframes tutorial-pointer-click {
  0%, 100% { transform: translate(18px, 18px) scale(1); }
  45% { transform: translate(210px, 72px) scale(1); }
  55% { transform: translate(210px, 72px) scale(0.88); }
}

@keyframes tutorial-pointer-type {
  0%, 100% { transform: translate(28px, 48px); }
  50% { transform: translate(170px, 208px); }
}

@keyframes tutorial-pointer-scan {
  0%, 100% { transform: translate(110px, 48px); }
  50% { transform: translate(110px, 170px); }
}

@keyframes tutorial-pointer-review {
  0%, 100% { transform: translate(24px, 36px); }
  50% { transform: translate(236px, 110px); }
}

.tutorial-chat textarea,
.tutorial-quiz fieldset {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--tut-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--tut-text);
  padding: 16px;
}

.tutorial-chat textarea {
  min-height: 120px;
  resize: vertical;
}

.tutorial-chat-answer,
.tutorial-alert {
  margin-top: 16px;
  border-radius: 18px;
  padding: 16px 18px;
  border: 1px solid rgba(132, 170, 235, 0.16);
  background: rgba(255, 255, 255, 0.03);
}

.tutorial-alert.ok {
  border-color: rgba(115, 222, 174, 0.34);
}

.tutorial-alert.warn {
  border-color: rgba(255, 189, 112, 0.34);
}

.tutorial-alert.danger {
  border-color: rgba(255, 143, 143, 0.34);
}

.quiz-question {
  margin: 0 0 18px;
  padding: 0;
  border: 0;
}

.quiz-options {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.quiz-option {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 14px 16px;
  border: 1px solid rgba(132, 170, 235, 0.14);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.02);
}

.quiz-option input {
  margin: 0;
}

.tutorial-footer-note {
  color: var(--tut-muted);
  font-size: 0.92rem;
}

.deck-slide {
  min-height: calc(100vh - 160px);
  padding: 44px;
  display: none;
  position: relative;
  overflow: hidden;
}

.deck-slide.active {
  display: grid;
}

.deck-slide::after {
  content: "";
  position: absolute;
  inset: auto -100px -100px auto;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(61, 114, 255, 0.16), transparent 72%);
  pointer-events: none;
}

.deck-slide h1,
.deck-slide h2 {
  font-size: clamp(3rem, 6vw, 5.6rem);
  line-height: 0.95;
  margin: 0;
  letter-spacing: -0.05em;
  max-width: 15ch;
}

.deck-slide p {
  max-width: 64ch;
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  line-height: 1.7;
}

.deck-kicker {
  color: var(--tut-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
}

.deck-columns {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
  align-items: end;
}

.deck-stat {
  border: 1px solid rgba(118, 169, 255, 0.18);
  border-radius: 22px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.03);
}

.deck-stat strong {
  display: block;
  font-size: 2.4rem;
  margin-bottom: 6px;
}

.deck-controls {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.deck-index {
  display: inline-flex;
  gap: 8px;
  flex-wrap: wrap;
}

.deck-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(118, 169, 255, 0.24);
}

.deck-dot.active {
  background: var(--tut-accent);
  border-color: transparent;
}

.hidden {
  display: none !important;
}

@media (max-width: 1200px) {
  .tutorial-hero,
  .tutorial-grid,
  .tutorial-layout,
  .deck-columns {
    grid-template-columns: 1fr;
  }

  .tutorial-progress-grid,
  .tutorial-tracks,
  .tutorial-user-grid,
  .tutorial-deck-grid,
  .tutorial-metrics {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 780px) {
  .tutorial-shell {
    width: min(100%, calc(100% - 24px));
  }

  .tutorial-topbar {
    border-radius: 28px;
  }

  .tutorial-topbar,
  .tutorial-nav,
  .slide-nav,
  .quiz-actions,
  .chapter-item {
    flex-direction: column;
    align-items: stretch;
  }

  .tutorial-button,
  .tutorial-button-secondary,
  .tutorial-chip {
    width: 100%;
  }

  .deck-slide {
    padding: 28px 22px;
    min-height: calc(100vh - 120px);
  }

  .tutorial-card,
  .tutorial-panel,
  .tutorial-progress-card,
  .tutorial-track-card,
  .tutorial-user-card,
  .tutorial-slide,
  .tutorial-visual,
  .tutorial-chat,
  .tutorial-quiz {
    padding: 22px;
    border-radius: 20px;
  }

  .tutorial-visual-grid {
    grid-template-columns: 1fr;
  }
}