/* ═══════════════════════════════════════════════════════════
   PYTHON FICHES — Stylesheet
   Theme: Dark code editor aesthetic with vibrant accent colors
   ═══════════════════════════════════════════════════════════ */

:root {
  /* Core palette */
  --bg-main:       #0d1117;
  --bg-sidebar:    #161b22;
  --bg-card:       #1c2128;
  --bg-card-hover: #21262d;
  --bg-code:       #0d1117;
  --bg-banner:     #161b22;

  /* Borders */
  --border:        #30363d;
  --border-light:  #21262d;

  /* Text */
  --text-primary:   #e6edf3;
  --text-secondary: #8b949e;
  --text-muted:     #484f58;
  --text-code:      #79c0ff;

  /* Accent colors per topic */
  --accent-python:      #f7c948;
  --accent-variables:   #56d364;
  --accent-conditions:  #58a6ff;
  --accent-boucles:     #bc8cff;
  --accent-chaines:     #ff7b72;
  --accent-listes:      #ffa657;
  --accent-dicts:       #f778ba;
  --accent-default:     #f7c948;

  /* Semantic */
  --success:  #3fb950;
  --error:    #f85149;
  --warning:  #e3b341;
  --info:     #58a6ff;

  /* Layout */
  --banner-h:  64px;
  --sidebar-w: 260px;
  --radius:    8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; }

/* ══════════════════════════════════════
   BANNER
   ══════════════════════════════════════ */
.banner {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--banner-h);
  background: var(--bg-banner);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
  gap: 20px;
}

.banner-left {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.logo-snake {
  font-size: 32px;
  line-height: 1;
  filter: drop-shadow(0 0 12px rgba(247, 201, 72, 0.5));
  animation: snakePulse 3s ease-in-out infinite;
}

@keyframes snakePulse {
  0%, 100% { filter: drop-shadow(0 0 8px rgba(247,201,72,0.4)); transform: rotate(0deg); }
  50%       { filter: drop-shadow(0 0 20px rgba(247,201,72,0.8)); transform: rotate(5deg); }
}

.banner-title {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.banner-title-main {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-python);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.banner-title-sub {
  font-size: 11px;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.banner-center {
  flex: 1;
  display: flex;
  justify-content: center;
}

.banner-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3px 12px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.banner-right {
  flex-shrink: 0;
}

.progress-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.progress-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.progress-bar {
  width: 120px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-python), var(--accent-variables));
  border-radius: 2px;
  transition: width 0.5s ease;
  width: 0%;
}

.progress-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-secondary);
  min-width: 35px;
}

/* ══════════════════════════════════════
   LAYOUT
   ══════════════════════════════════════ */
.app-layout {
  display: flex;
  margin-top: var(--banner-h);
  min-height: calc(100vh - var(--banner-h));
}

/* ══════════════════════════════════════
   SIDEBAR
   ══════════════════════════════════════ */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  position: fixed;
  top: var(--banner-h);
  left: 0;
  bottom: 0;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  padding-bottom: 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-section-label {
  padding: 20px 20px 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  font-weight: 600;
}

.nav-list {
  padding: 4px 12px;
}

.nav-item {
  margin-bottom: 2px;
}

.nav-link {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  transition: all var(--transition);
  text-align: left;
}

.nav-link:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-icon { font-size: 16px; flex-shrink: 0; }
.nav-text { flex: 1; }

.nav-arrow {
  font-size: 16px;
  transition: transform var(--transition);
  color: var(--text-muted);
}

.nav-item.open > .nav-link .nav-arrow {
  transform: rotate(90deg);
}

/* Accent colors per section */
.nav-item[data-for="intro"]          .nav-link.active,
.nav-item[data-for="intro"]          .nav-link:hover    { color: var(--accent-python); }
.nav-item[data-for="variables"]      .nav-link.active   { color: var(--accent-variables); border-left: 3px solid var(--accent-variables); }
.nav-item[data-for="conditions"]     .nav-link.active   { color: var(--accent-conditions); border-left: 3px solid var(--accent-conditions); }
.nav-item[data-for="boucles"]        .nav-link.active   { color: var(--accent-boucles); border-left: 3px solid var(--accent-boucles); }
.nav-item[data-for="chaines"]        .nav-link.active   { color: var(--accent-chaines); border-left: 3px solid var(--accent-chaines); }
.nav-item[data-for="listes"]         .nav-link.active   { color: var(--accent-listes); border-left: 3px solid var(--accent-listes); }
.nav-item[data-for="dictionnaires"]  .nav-link.active   { color: var(--accent-dicts); border-left: 3px solid var(--accent-dicts); }

.nav-sub {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding-left: 8px;
}

.nav-item.open .nav-sub {
  max-height: 600px;
}

.nav-sub-link {
  display: block;
  width: 100%;
  text-align: left;
  padding: 5px 10px 5px 32px;
  font-size: 12.5px;
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: all var(--transition);
  position: relative;
}

.nav-sub-link::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border);
  transition: background var(--transition);
}

.nav-sub-link:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-sub-link:hover::before { background: var(--text-secondary); }

.nav-sub-link.active {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

.sidebar-footer {
  margin-top: auto;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

.sidebar-footer-text {
  font-size: 11px;
  color: var(--text-muted);
}

/* ══════════════════════════════════════
   MAIN CONTENT
   ══════════════════════════════════════ */
.content-area {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 40px 48px;
  max-width: 900px;
}

/* ── Page Sections ── */
.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.page-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.page-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 12px;
}

.page-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 600px;
}

/* ── Sections ── */
.section {
  margin-bottom: 48px;
  scroll-margin-top: 80px;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding: 14px 20px;
  border-radius: var(--radius-lg);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  transition: border-color var(--transition);
}

.card:hover { border-color: #444c56; }

.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

/* ── Code blocks ── */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-default);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 16px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13.5px;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
  color: #e6edf3;
}

.code-block .comment  { color: #6e7681; font-style: italic; }
.code-block .keyword  { color: #ff7b72; }
.code-block .string   { color: #a5d6ff; }
.code-block .number   { color: #79c0ff; }
.code-block .func     { color: #d2a8ff; }
.code-block .output   { color: #56d364; }
.code-block .builtin  { color: #ffa657; }

/* ── Tables ── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  margin: 16px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

thead tr {
  background: rgba(255,255,255,0.04);
}

thead th {
  padding: 12px 16px;
  text-align: left;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border-light);
  transition: background var(--transition);
}

tbody tr:hover { background: rgba(255,255,255,0.02); }
tbody tr:last-child { border-bottom: none; }

tbody td {
  padding: 10px 16px;
  color: var(--text-primary);
  vertical-align: middle;
}

td code, th code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  background: rgba(255,255,255,0.06);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-code);
}

td.td-code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--text-code);
}

td.td-result {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--success);
}

/* ── Alert / Info boxes ── */
.alert {
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 13.5px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px solid;
}

.alert-icon { font-size: 18px; flex-shrink: 0; line-height: 1.4; }

.alert-warning {
  background: rgba(227, 179, 65, 0.08);
  border-color: rgba(227, 179, 65, 0.3);
  color: #e3b341;
}

.alert-info {
  background: rgba(88, 166, 255, 0.08);
  border-color: rgba(88, 166, 255, 0.3);
  color: var(--info);
}

.alert-success {
  background: rgba(63, 185, 80, 0.08);
  border-color: rgba(63, 185, 80, 0.3);
  color: var(--success);
}

.alert-error {
  background: rgba(248, 81, 73, 0.08);
  border-color: rgba(248, 81, 73, 0.3);
  color: var(--error);
}

/* ── Two column layout ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0;
}

.two-col .card { margin-bottom: 0; }

/* ── Inline code ── */
p code, li code, td code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  background: rgba(255,255,255,0.07);
  padding: 1px 6px;
  border-radius: 4px;
  color: #79c0ff;
  border: 1px solid rgba(255,255,255,0.08);
}

/* ── List items ── */
.checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
}

.checklist li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: var(--text-secondary);
}

.checklist li::before {
  content: '▸';
  color: var(--accent-default);
  flex-shrink: 0;
  margin-top: 1px;
}

/* ═══════════════════════════════════
   QCM STYLES
   ═══════════════════════════════════ */
.qcm-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
  overflow: hidden;
}

.qcm-question {
  background: rgba(124,58,237,0.15);
  border-bottom: 1px solid rgba(124,58,237,0.3);
  padding: 14px 20px;
  font-weight: 600;
  font-size: 14px;
  color: #c4b5fd;
}

.qcm-choices {
  padding: 12px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qcm-choice {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 13.5px;
  background: transparent;
  color: var(--text-primary);
  width: 100%;
  text-align: left;
}

.qcm-choice:hover:not(.revealed) {
  background: rgba(255,255,255,0.04);
  border-color: #444c56;
}

.qcm-choice-letter {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.qcm-choice.correct {
  background: rgba(63,185,80,0.12);
  border-color: rgba(63,185,80,0.4);
  color: #3fb950;
}

.qcm-choice.correct .qcm-choice-letter {
  background: rgba(63,185,80,0.2);
  color: #3fb950;
}

.qcm-choice.wrong {
  background: rgba(248,81,73,0.08);
  border-color: rgba(248,81,73,0.3);
  color: #8b949e;
  opacity: 0.7;
}

.qcm-explanation {
  margin: 8px 20px 16px;
  padding: 12px 16px;
  background: rgba(227,179,65,0.08);
  border: 1px solid rgba(227,179,65,0.2);
  border-radius: var(--radius);
  font-size: 13px;
  color: #e3b341;
  display: none;
}

.qcm-explanation.show { display: block; }
.qcm-explanation::before { content: '💡 '; }

/* ═══════════════════════════════════
   EXERCISE STYLES
   ═══════════════════════════════════ */
.exercise-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--error);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 24px;
}

.exercise-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--error);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.exercise-steps {
  list-style: none;
  counter-reset: steps;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 16px 0;
}

.exercise-steps li {
  counter-increment: steps;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: 14px;
  color: var(--text-secondary);
}

.exercise-steps li::before {
  content: counter(steps);
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: rgba(248,81,73,0.15);
  color: var(--error);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.expected-output {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-left: 3px solid var(--success);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--success);
  line-height: 1.8;
  margin-top: 16px;
  white-space: pre;
}

/* ═══════════════════════════════════
   INDEX / HOME PAGE
   ═══════════════════════════════════ */
.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.home-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  overflow: hidden;
}

.home-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--card-accent, var(--accent-default));
  opacity: 0;
  transition: opacity var(--transition);
}

.home-card:hover {
  border-color: #444c56;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.home-card:hover::before { opacity: 1; }

.home-card-icon { font-size: 36px; }

.home-card-title {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 16px;
  color: var(--text-primary);
}

.home-card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.home-card-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid;
  width: fit-content;
}

/* ═══════════════════════════════════
   TOPIC COLOR SCHEMES
   ═══════════════════════════════════ */
.theme-variables    { --accent-default: var(--accent-variables);     --section-bg: rgba(86,211,100,0.06);  --section-border: rgba(86,211,100,0.2); }
.theme-conditions   { --accent-default: var(--accent-conditions);    --section-bg: rgba(88,166,255,0.06);  --section-border: rgba(88,166,255,0.2); }
.theme-boucles      { --accent-default: var(--accent-boucles);       --section-bg: rgba(188,140,255,0.06); --section-border: rgba(188,140,255,0.2); }
.theme-chaines      { --accent-default: var(--accent-chaines);       --section-bg: rgba(255,123,114,0.06); --section-border: rgba(255,123,114,0.2); }
.theme-listes       { --accent-default: var(--accent-listes);        --section-bg: rgba(255,166,87,0.06);  --section-border: rgba(255,166,87,0.2); }
.theme-dictionnaires{ --accent-default: var(--accent-dicts);         --section-bg: rgba(247,120,186,0.06); --section-border: rgba(247,120,186,0.2); }

.section-heading {
  background: var(--section-bg, rgba(255,255,255,0.04));
  border: 1px solid var(--section-border, var(--border));
}

.section-num {
  background: var(--accent-default, var(--accent-python));
  color: #000;
}

/* ═══════════════════════════════════
   BREADCRUMB
   ═══════════════════════════════════ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 12px;
  color: var(--text-muted);
}

.breadcrumb-sep { color: var(--text-muted); }
.breadcrumb-current { color: var(--text-secondary); }

/* ═══════════════════════════════════
   SCROLLBAR
   ═══════════════════════════════════ */
::-webkit-scrollbar       { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #444c56; }

/* ═══════════════════════════════════
   INDEX DIAGRAM
   ═══════════════════════════════════ */
.index-diagram {
  display: flex;
  gap: 0;
  margin: 16px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
}

.index-cell {
  flex: 1;
  text-align: center;
  border: 1px solid var(--border);
  border-right: none;
}

.index-cell:last-child { border-right: 1px solid var(--border); }

.index-cell .val {
  padding: 10px 4px;
  background: rgba(88,166,255,0.08);
  font-weight: 700;
  color: #58a6ff;
  border-bottom: 1px solid var(--border);
}

.index-cell .pos-idx {
  padding: 5px 4px;
  font-size: 12px;
  color: var(--success);
  border-bottom: 1px solid var(--border-light);
}

.index-cell .neg-idx {
  padding: 5px 4px;
  font-size: 12px;
  color: var(--error);
}

/* ═══════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════ */
@media (max-width: 900px) {
  .banner-center { display: none; }
  .sidebar { width: 56px; }
  .nav-text, .nav-arrow, .sidebar-section-label,
  .sidebar-footer, .nav-sub { display: none; }
  .nav-link { justify-content: center; padding: 10px; }
  .content-area { margin-left: 56px; padding: 24px 20px; }
  .two-col, .card-grid, .home-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .banner-right { display: none; }
  .content-area { padding: 16px; }
  .page-title { font-size: 26px; }
}

/* ── Animations on load ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.page-header  { animation: fadeInUp 0.4s ease both; }
.section      { animation: fadeInUp 0.4s ease both; }
.section:nth-child(2)  { animation-delay: 0.05s; }
.section:nth-child(3)  { animation-delay: 0.10s; }
.section:nth-child(4)  { animation-delay: 0.15s; }
.section:nth-child(5)  { animation-delay: 0.20s; }
.section:nth-child(6)  { animation-delay: 0.25s; }
.section:nth-child(7)  { animation-delay: 0.30s; }
.section:nth-child(8)  { animation-delay: 0.35s; }