.tutorial-page { padding: 2rem 0 5rem; }

.lesson-practice-cta {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  margin-top: 2.5rem;
  margin-bottom: 2rem;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border-2);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s;
}
.lesson-practice-cta:hover { border-color: var(--clr-accent); transform: translateY(-1px); }
.lesson-practice-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-accent);
  background: var(--clr-accent-glow);
  border-radius: var(--radius-sm);
}
.lesson-practice-text { flex: 1; display: flex; flex-direction: column; gap: 0.15rem; }
.lesson-practice-text strong { font-size: 0.95rem; }
.lesson-practice-text span:last-child { font-size: 0.85rem; color: var(--clr-text-muted); }
.lesson-practice-cta > svg { flex-shrink: 0; color: var(--clr-text-muted); }

.lesson-practice-cta.is-done { border-color: var(--clr-success, #1e9bff); }
.lesson-practice-cta.is-done .lesson-practice-icon { color: var(--clr-success, #1e9bff); background: rgba(30,155,255, 0.12); }

.lesson-practice-cta.is-locked {
  cursor: not-allowed;
  opacity: 0.6;
}
.lesson-practice-cta.is-locked:hover { border-color: var(--clr-border-2); transform: none; }
.lesson-practice-cta.is-locked .lesson-practice-icon { color: var(--clr-text-muted); background: var(--clr-surface-3, var(--clr-surface-2)); }

.lesson-read-toggle {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  width: 100%;
  padding: 1rem 1.25rem;
  margin-top: 2.5rem;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border-2);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  font-family: var(--font-sans);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s, background 0.15s;
}
.lesson-read-toggle:hover { border-color: var(--clr-accent); transform: translateY(-1px); }
.lesson-read-toggle.is-busy { opacity: 0.7; cursor: wait; pointer-events: none; }

.lesson-read-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-text-muted);
  background: var(--clr-surface-3, var(--clr-surface));
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
}
.lesson-read-icon .icon-read { display: none; }

.lesson-read-text { flex: 1; display: flex; flex-direction: column; gap: 0.15rem; }
.lesson-read-title { font-size: 0.95rem; transition: color 0.15s; }
.lesson-read-sub { font-size: 0.85rem; color: var(--clr-text-muted); }

.lesson-read-toggle.is-read {
  border-color: var(--clr-success, #1e9bff);
  background: rgba(30,155,255, 0.06);
}
.lesson-read-toggle.is-read .lesson-read-icon {
  color: var(--clr-success, #1e9bff);
  background: rgba(30,155,255, 0.12);
}
.lesson-read-toggle.is-read .lesson-read-icon .icon-unread { display: none; }
.lesson-read-toggle.is-read .lesson-read-icon .icon-read { display: block; }
.lesson-read-toggle.is-read .lesson-read-title { color: var(--clr-success, #1e9bff); }

.lesson-read-toggle.lesson-read-guest .lesson-read-icon { color: var(--clr-accent); background: var(--clr-accent-glow); }

.sidebar-read-summary {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--clr-border);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--clr-text-dim);
}

.tutorial-header {
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: 3rem;
}
.tutorial-header .tag  { margin-bottom: 1rem; }
.tutorial-header h1    { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.03em; margin-bottom: 0.875rem; }
.tutorial-header .lead {
  font-size: 1.1rem;
  color: var(--clr-text-muted);
  max-width: 640px;
  line-height: 1.7;
}
.tutorial-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--clr-border);
}
.meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--clr-text-muted);
}
.meta-item svg { color: var(--clr-accent); }

.tut-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}
.tut-index-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: border-color 0.3s, transform 0.3s var(--ease-out), box-shadow 0.3s;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.tut-index-card:hover {
  border-color: var(--clr-border-2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.tut-card-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--clr-text-dim);
  background: var(--clr-surface-2);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  margin-top: 2px;
}
.tut-index-card.is-read { border-color: rgba(30,155,255, 0.35); }
.tut-index-card.is-read .tut-card-num { background: rgba(30,155,255, 0.12); }
.tut-card-body {}
.tut-card-title { font-size: 0.975rem; font-weight: 600; margin-bottom: 0.35rem; color: var(--clr-text); }
.tut-card-desc  { font-size: 0.825rem; color: var(--clr-text-muted); line-height: 1.5; }

.tutorial-nav {
  display: flex;
  align-items: stretch;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--clr-border);
}
.tut-nav-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  transition: border-color 0.25s, background 0.25s;
}
.tut-nav-btn:hover { border-color: var(--clr-border-2); background: var(--clr-surface-2); }
.tut-nav-btn.next { justify-content: flex-end; text-align: right; }
.tut-nav-label { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--clr-text-dim); margin-bottom: 0.2rem; }
.tut-nav-title { font-size: 0.9rem; font-weight: 600; color: var(--clr-text); }
.tut-nav-icon { color: var(--clr-accent); flex-shrink: 0; }

.simple-page { padding: 5rem 0; }
.simple-page h1 { font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -0.03em; margin-bottom: 1.25rem; }
.simple-page .lead { font-size: 1.1rem; color: var(--clr-text-muted); max-width: 600px; line-height: 1.7; margin-bottom: 3rem; }

.contact-form {
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.form-group { display: flex; flex-direction: column; gap: 0.5rem; }
.form-label { font-size: 0.875rem; font-weight: 500; color: var(--clr-text-muted); }
.form-input, .form-textarea {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 0.875rem 1.125rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--clr-text);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}
.form-input:focus, .form-textarea:focus {
  border-color: rgba(30,155,255,0.4);
  box-shadow: 0 0 0 3px rgba(30,155,255,0.08);
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--clr-text-dim); }
.form-textarea { min-height: 140px; resize: vertical; }

.sidebar-progress {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--clr-border);
}
.progress-label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--clr-text-dim);
  margin-bottom: 0.5rem;
}
.progress-bar {
  height: 4px;
  background: var(--clr-surface-2);
  border-radius: 99px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent-2));
  border-radius: 99px;
  transition: width 0.6s var(--ease-out);
}

.tutorial-sidebar {
  width: 300px;
  min-width: 280px;
  flex-shrink: 0;
  position: sticky;
  top: 96px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  order: -1;
}

@media (max-width: 900px) {
  .tutorial-sidebar { display: none; }
}

.mob-lesson-bar {
  display: none !important;
  position: sticky;
  top: 60px;
  z-index: 200;
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
@media (max-width: 900px) {
  .mob-lesson-bar { display: block !important; }
}

.mob-lesson-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: .625rem;
  padding: .75rem 1rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--clr-text);
  font-family: var(--font-sans);
  font-size: .875rem;
  font-weight: 600;
  text-align: left;
}
.mob-lesson-toggle:hover { background: var(--clr-surface-2); }

.mob-lesson-progress {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--clr-accent);
  background: rgba(30,155,255,.1);
  border: 1px solid rgba(30,155,255,.2);
  padding: .15rem .45rem;
  border-radius: 99px;
}

.mob-lesson-drawer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s cubic-bezier(0.4,0,0.2,1);
  background: var(--clr-bg);
  border-top: 1px solid var(--clr-border);
}
.mob-lesson-drawer.mob-drawer-open {
  max-height: 70vh;
  overflow-y: auto;
}

.mob-drawer-inner {
  padding: .875rem 1rem 1.25rem;
}

.mob-course-back {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .78rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  margin-bottom: .75rem;
  transition: color .15s;
}
.mob-course-back:hover { color: var(--clr-accent); }

.mob-progress-bar {
  height: 3px;
  background: var(--clr-border);
  border-radius: 99px;
  margin-bottom: 1rem;
  overflow: hidden;
}
.mob-progress-fill {
  height: 100%;
  background: var(--clr-accent);
  border-radius: 99px;
  transition: width .4s ease;
}

.mob-lesson-list {
  list-style: none;
  padding: 0; margin: 0;
  display: flex;
  flex-direction: column;
  gap: .2rem;
}

.mob-lesson-item {
  display: flex;
  align-items: center;
  gap: .625rem;
  padding: .6rem .75rem;
  border-radius: 8px;
  font-size: .855rem;
  color: var(--clr-text-muted);
  transition: background .15s, color .15s;
  text-decoration: none;
}
.mob-lesson-item:hover {
  background: var(--clr-surface-2);
  color: var(--clr-text);
}
.mob-lesson-item.mob-active {
  background: rgba(30,155,255,.1);
  color: var(--clr-accent);
  font-weight: 600;
}

.mob-lesson-num {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--clr-text-dim);
  min-width: 1.5rem;
  flex-shrink: 0;
}
.mob-active .mob-lesson-num { color: var(--clr-accent); }

.mob-lesson-name { flex: 1; line-height: 1.4; }

.mob-lesson-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 199;
  backdrop-filter: blur(2px);
}
.mob-lesson-overlay.mob-overlay-show { display: block; }

.sidebar-header { margin-bottom: 1rem; }

.sidebar-course-link {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .8rem;
  color: var(--clr-text-muted);
  font-weight: 600;
  transition: color .2s;
  margin-bottom: .75rem;
}
.sidebar-course-link:hover { color: var(--clr-accent); }

.sidebar-progress {
  display: flex;
  align-items: center;
  gap: .6rem;
}
.progress-bar {
  flex: 1;
  height: 4px;
  background: var(--clr-border-2);
  border-radius: 99px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--clr-accent);
  border-radius: 99px;
  transition: width .5s var(--ease-out);
}
.progress-text {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--clr-text-dim);
  white-space: nowrap;
}

.sidebar-lessons {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-lesson-link {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .5rem .65rem;
  border-radius: var(--radius-sm);
  font-size: .84rem;
  color: var(--clr-text-muted);
  transition: color .2s, background .2s;
  text-decoration: none;
}
.sidebar-lesson-link:hover {
  color: var(--clr-text);
  background: var(--clr-surface-2);
}
.sidebar-lesson-link.active {
  color: var(--clr-accent);
  background: var(--clr-accent-glow);
  font-weight: 600;
}

.lesson-num {
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--clr-text-dim);
  min-width: 24px;
}

.lesson-title { flex: 1; }

.lesson-check { color: var(--clr-accent); flex-shrink: 0; }

.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--clr-border);
}

@media (max-width: 600px) {
  .lesson-nav { grid-template-columns: 1fr; }
}

.lesson-nav-btn {
  display: flex;
  align-items: center;
  gap: .75rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  transition: border-color .2s, transform .2s, box-shadow .2s;
  text-decoration: none;
  color: inherit;
}
.lesson-nav-btn:hover {
  border-color: var(--clr-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}
.lesson-nav-next { justify-content: flex-end; text-align: right; }

.lesson-nav-label {
  display: block;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--clr-text-dim);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: .2rem;
}
.lesson-nav-title {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  color: var(--clr-text);
}

.pagination { margin-top: 2.5rem; }
.pagination-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
}
.pagination-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 .75rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  font-size: .875rem;
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: all .2s;
}
.pagination-btn:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
}
.pagination-btn.active {
  background: var(--clr-accent);
  border-color: var(--clr-accent);
  color: #000;
  font-weight: 700;
}
[data-theme="light"] .pagination-btn.active { color: #fff; }
.pagination-ellipsis {
  color: var(--clr-text-dim);
  padding: 0 .25rem;
}

.search-footer {
  text-align: center;
  padding: .75rem;
  border-top: 1px solid var(--clr-border);
  margin-top: .5rem;
}
.search-footer a {
  font-size: .8rem;
  color: var(--clr-accent);
}
.search-result-text {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  flex: 1;
  min-width: 0;
}
.search-result-title { font-weight: 600; color: var(--clr-text); }
.search-result-excerpt { font-size: .78rem; color: var(--clr-text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.search-page-form {
  margin: 2rem 0 2.5rem;
  max-width: 600px;
}
.search-page-inner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-2);
  border-radius: 999px;
  padding: 0.5rem 0.5rem 0.5rem 1.4rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-page-inner:focus-within {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px var(--clr-accent-glow), 0 4px 24px rgba(30,155,255,0.08);
}
.search-page-inner > svg {
  color: var(--clr-text-muted);
  flex-shrink: 0;
}
.search-page-inner:focus-within > svg {
  color: var(--clr-accent);
}
.search-page-inner input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--clr-text);
  min-width: 0;
}
.search-page-inner input::placeholder { color: var(--clr-text-dim); }
.search-page-inner button {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--clr-accent);
  color: #0a0e14;
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  flex-shrink: 0;
  letter-spacing: 0.01em;
}
.search-page-inner button:hover {
  background: var(--clr-accent-2);
  transform: scale(1.03);
}
[data-theme="light"] .search-page-inner button { color: #fff; }
.search-page-inner button svg { flex-shrink: 0; }

@media (max-width: 480px) {
  .search-page-inner { padding: 0.4rem 0.4rem 0.4rem 1rem; }
  .search-page-inner button { padding: 0.55rem 1rem; }
  .search-page-inner button svg { display: none; }
}

.lesson-breadcrumb {
  margin-bottom: 1.25rem;
}
.lesson-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.78rem;
  color: var(--clr-text-dim);
  font-family: var(--font-mono);
}
.lesson-breadcrumb li {
  display: flex;
  align-items: center;
}
.lesson-breadcrumb a {
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.lesson-breadcrumb a:hover { color: var(--clr-accent); }
.lesson-breadcrumb span[aria-hidden] {
  color: var(--clr-text-dim);
  font-size: 0.7rem;
}

.policy-page .prose { max-width: 760px; }
.policy-header { margin-bottom: 2.5rem; padding-bottom: 2rem; border-bottom: 1px solid var(--clr-border); }
.policy-header .tag { margin-bottom: 1rem; }
.policy-header h1 { margin-bottom: 1rem; }
.policy-header .lead { max-width: none; margin-bottom: 1.25rem; }
.policy-updated {
  display: inline-block;
  margin: 0;
  padding: 0.35rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8rem !important;
  color: var(--clr-text-muted);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 99px;
}
.policy-page .prose h2 { padding-top: 0.5rem; }
@media (max-width: 600px) {
  .policy-page { padding: 3rem 0; }
}