:root {
  --dd-border-soft: rgba(255,255,255,0.09);
  --dd-warning: #f59e0b;
  --dd-info: #3b82f6;
  --dd-info-soft: rgba(59,130,246,0.1);
  --dd-info-border: rgba(59,130,246,0.2);
  --dd-syntax-error: rgba(255, 92, 122, 0.15);
  --dd-syntax-error-border: rgba(255, 92, 122, 0.3);
  --dd-syntax-error-text: #ff8a95;
  --dd-font-mono: "Fira Code", "Cascadia Code", "Courier New", monospace;
  --ca-sidebar-w: 272px;
  --ca-topbar-h: 60px;
  --ca-prac-header-h: 72px;
  --text-main: rgba(248, 250, 252, 0.9);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--dd-font-body);
  background: var(--dd-bg);
  color: var(--dd-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.ca-sidebar::-webkit-scrollbar { width: 5px; height: 5px; }
.ca-sidebar::-webkit-scrollbar-track { background: transparent; }
.ca-sidebar::-webkit-scrollbar-thumb { background: rgba(99,102,241,0.3); border-radius: 99px; }
.ca-sidebar::-webkit-scrollbar-thumb:hover { background: rgba(99,102,241,0.55); }

.dd-nav-wrap { position: absolute !important; }

button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; }
a { text-decoration: none; color: inherit; }

.ca-arena {
  display: flex;
  
  position: relative;
  background: var(--dd-bg);
}

.ca-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  z-index: 45;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dd-transition-med);
}
.ca-overlay.active { opacity: 1; pointer-events: all; }

.ca-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  width: var(--ca-sidebar-w);
  flex-shrink: 0;
  background: var(--dd-bg-contrast);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--dd-border-subtle);
  transition: transform var(--dd-transition-slow);
}

.ca-brand {
  display: flex;
  align-items: center;
  justify-content: right;
  padding: 18px 16px 14px;
  border-bottom: 1px solid var(--dd-border-subtle);
  flex-shrink: 0;
}

.ca-brand__close {
  width: 28px;
  height: 28px;
  border-radius: var(--dd-radius-sm);
  color: var(--dd-text-softer);
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  transition: all var(--dd-transition-fast);
}
.ca-brand__close:hover { background: var(--dd-accent-soft); color: var(--dd-accent); }
.ca-sidebar-meta {
  padding: 12px 16px 8px;
  flex-shrink: 0;
}
.ca-prog-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--dd-font-display);
  color: var(--dd-text-softer);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.ca-prog-pct { color: var(--dd-accent); font-weight: 700; }
.ca-prog-track {
  height: 4px;
  background: var(--dd-bg-soft);
  border-radius: 99px;
  overflow: hidden;
}
.ca-prog-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--dd-accent), var(--dd-accent-2));
  border-radius: 99px;
  transition: width 0.6s cubic-bezier(0.33,1,0.68,1);
}

.ca-sidebar-search {
  padding: 10px 14px 4px;
  flex-shrink: 0;
}
.ca-search-wrap {
  position: relative;
}
.ca-search-wrap svg {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  color: var(--dd-text-softer);
  pointer-events: none;
}
.ca-search-input {
  width: 100%;
  padding: 8px 12px 8px 32px;
  background: var(--dd-bg-soft);
  border: 1px solid var(--dd-border-subtle);
  border-radius: var(--dd-radius-sm);
  color: var(--dd-text);
  font-size: 13px;
  outline: none;
  transition: all var(--dd-transition-fast);
}
.ca-search-input::placeholder { color: var(--dd-text-softer); }
.ca-search-input:focus { border-color: var(--dd-accent); background: var(--dd-accent-soft); }

.ca-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0 20px;
}

.ca-chapter { margin-bottom: 2px; }

.ca-chapter-hd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  cursor: pointer;
  transition: background var(--dd-transition-fast);
  user-select: none;
}
.ca-chapter-hd:hover { background: rgba(255,255,255,0.03); }
.ca-chapter-hd-left {
  display: flex;
  align-items: center;
  gap: 8px;
}
.ca-chapter-hd-num {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background: var(--dd-bg-soft);
  font-size: 10px;
  font-weight: 700;
  color: var(--dd-text-softer);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--dd-font-display);
  flex-shrink: 0;
}
.ca-chapter-hd-title {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--dd-font-display);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--dd-text-softer);
}
.ca-chapter-hd svg {
  font-size: 10px;
  color: var(--dd-text-softer);
  transition: transform var(--dd-transition-fast);
}
.ca-chapter.open .ca-chapter-hd svg { transform: rotate(180deg); }

.ca-chapter-lessons {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.38s cubic-bezier(0.4,0,0.2,1);
}
.ca-chapter.open .ca-chapter-lessons { max-height: 600px; }

.ca-lesson {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 15px;
  border-left: 3px solid transparent;
  color: var(--dd-text);
  text-decoration: none;
  transition: all var(--dd-transition-fast);
  font-size: 13.5px;
  position: relative;
}
.ca-lesson:hover { background: var(--dd-accent-soft); color: var(--dd-text); border-left-color: rgba(99,102,241,0.4); }
.ca-lesson.active { background: var(--dd-accent-soft); color: var(--dd-accent); border-left-color: var(--dd-accent); font-weight: 600; }
.ca-lesson.done { color: var(--dd-text-soft); }
.ca-lesson.active.done { color: var(--dd-accent); }
.ca-lesson svg { font-size: 13.5px; }
.ca-lesson.done svg { color: var(--dd-success); }
.ca-lesson.active.done svg { color: var(--dd-success); }
.ca-lesson.active svg { color: var(--dd-accent); }
.ca-lesson-name { flex: 1; line-height: 1.4; }
.ca-lesson-badge {
  font-size: 9px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 99px;
  background: var(--dd-accent-soft);
  color: var(--dd-accent);
  font-family: var(--dd-font-display);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  opacity: 0;
  transition: opacity var(--dd-transition-fast);
}
.ca-lesson.active .ca-lesson-badge { opacity: 1; }

.ca-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.ca-topbar {
  height: var(--ca-topbar-h);
  background: var(--dd-bg);
  border-bottom: 1px solid var(--dd-border-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 32px;
  flex-shrink: 0;
  position: relative;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
  box-sizing: border-box;
}
.ca-topbar::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--dd-accent-soft), transparent);
}

.ca-topbar-menu {
  width: 36px;
  height: 36px;
  border-radius: var(--dd-radius-sm);
  color: var(--dd-text-soft);
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  transition: all var(--dd-transition-fast);
}
.ca-topbar-menu:hover { background: var(--dd-accent-soft); color: var(--dd-accent); }

.ca-topbar-crumb {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 0;
  overflow: hidden;
}
.ca-crumb-item {
  font-size: 13px;
  color: var(--dd-text-softer);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: var(--dd-font-display);
}
.ca-crumb-item.active { color: var(--dd-text-soft); font-weight: 500; }
.ca-topbar-crumb svg {
  font-size: 10px;
  color: var(--dd-text-softer);
  flex-shrink: 0;
}

.ca-topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.ca-topbar-lesson-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ca-icon-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--dd-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--dd-text-softer);
  border: 1px solid var(--dd-border-subtle);
  background: var(--dd-bg-soft);
  transition: all var(--dd-transition-fast);
}
.ca-icon-btn:hover { border-color: var(--dd-accent); color: var(--dd-accent); background: var(--dd-accent-soft); }
.ca-icon-btn:disabled { opacity: 0.35; pointer-events: none; }

.dd-post-content {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.ca-view {
  display: none;
  height: 100%;
}
.ca-view.active { display: flex; flex-direction: column; }

#view-tutorial {
  overflow-y: auto;
  align-items: flex-start;
}
#view-tutorial > .tut-wrap {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 32px 80px;
}
.ca-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  background: #151926;
  border-bottom: 1px solid var(--dd-border-subtle);
}
.ca-code-lang {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--dd-font-display);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--dd-text-softer);
}
.ca-code-copy {
  font-size: 12px;
  color: var(--dd-text-softer);
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 6px;
  transition: all var(--dd-transition-fast);
}
.ca-code-copy:hover { background: var(--dd-accent-soft); color: var(--dd-accent); }

.tut-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--dd-border-subtle);
}
.tut-footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.tut-footer-nav {
  display: flex;
  gap: 10px;
}
.tut-mark-done-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  border-radius: var(--dd-radius-pill);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--dd-font-display);
  color: var(--dd-text-softer);
  border: 1px solid var(--dd-border-subtle);
  background: var(--dd-bg-soft);
  transition: all var(--dd-transition-fast);
}
.tut-mark-done-btn:hover { border-color: var(--dd-success); color: var(--dd-success); background: rgba(46,204,113,0.1); }
.tut-mark-done-btn.done { border-color: var(--dd-success); color: var(--dd-success); background: rgba(46,204,113,0.1); }
.tut-mark-done-btn.done svg {color: var(--dd-success);}
.tut-mark-done-btn svg { color: inherit; }

.wrapper-c {
    display: flex;
    justify-content: center;
    align-items: center;
}
.dd-button-c {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: var(--dd-radius-pill);
    font-family: var(--dd-font-body);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    overflow: hidden;
    box-shadow: 0 6px 12px -3px rgba(99, 102, 241, 0.25);
    transition: box-shadow 0.3s ease;
    width: auto;
    max-width: fit-content;
    flex-shrink: 0;
}

.dd-button-c::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.dd-button-c:hover::before {
    transform: translateY(0);
}

.dd-button-c--primary {
    background: linear-gradient(90deg, var(--dd-accent), var(--dd-accent-2));
    color: var(--dd-text);
}

.dd-button-c--sm {
    padding: 16px 32px;
    font-size: 0.8rem;
    gap: 5px;
}

#view-practice {
  overflow: hidden;
}

.prac-header {
  height: var(--ca-prac-header-h);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 20px;
  background: var(--dd-bg-contrast);
  border-bottom: 1px solid var(--dd-border-subtle);
  flex-shrink: 0;
  flex-wrap: nowrap;
  overflow: hidden;
}
.prac-header-back {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border-radius: var(--dd-radius-pill);
  border: 1px solid var(--dd-border-subtle);
  background: var(--dd-bg-soft);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--dd-font-display);
  color: var(--dd-text-soft);
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--dd-transition-fast);
}
.prac-header-back:hover { border-color: var(--dd-accent); color: var(--dd-accent); background: var(--dd-accent-soft); }

.prac-header-title {
  flex: 1;
  min-width: 0;
}
.prac-header-title h2 {
  font-family: var(--dd-font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--dd-text);
  white-space: normal;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
  margin-top: 0 !important;
  margin-bottom: 0 !important;
}
.prac-header-subtitle {
  font-size: 11px;
  color: var(--dd-text-softer);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 5px;
}
.prac-header-subtitle svg { font-size: 9px; }

.prac-diff-tabs {
  display: flex;
  gap: 4px;
  background: var(--dd-bg-soft);
  border-radius: var(--dd-radius-pill);
  padding: 3px;
  flex-shrink: 0;
}
.prac-diff-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--dd-radius-pill);
  font-size: 12px;
  font-weight: 700;
  font-family: var(--dd-font-display);
  color: var(--dd-text-softer);
  transition: all var(--dd-transition-fast);
  white-space: nowrap;
}
.prac-diff-tab:hover { color: var(--dd-text); }
.prac-diff-tab.active[data-diff="easy"] { background: rgba(46,204,113,0.2); color: var(--dd-success); }
.prac-diff-tab.active[data-diff="medium"] { background: rgba(245,158,11,0.18); color: var(--dd-warning); }
.prac-diff-tab.active[data-diff="hard"] { background: rgba(255,92,122,0.18); color: var(--dd-danger); }
.prac-diff-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
}
.prac-diff-dot.easy { background: var(--dd-success); }
.prac-diff-dot.medium { background: var(--dd-warning); }
.prac-diff-dot.hard { background: var(--dd-danger); }

.prac-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.prac-split {
  display: grid;
  grid-template-columns: 42% 6px 1fr;
  flex: 1;
  overflow: hidden;
  position: relative;
}

.prac-challenge-panel {
  grid-column: 1;
  overflow-y: auto;
  padding: 24px 20px;
  border-right: 1px solid var(--dd-border-subtle);
  background: var(--dd-bg-softer);
  scrollbar-width: thin;
}

.prac-resizer {
  grid-column: 2;
  position: relative;
  width: 6px;
  background: transparent;
  cursor: e-resize;
  transition: opacity 0.2s ease;
  border-left: 3px solid transparent;
  border-right: 3px solid transparent;
}

.prac-resizer:hover {
  background-color: rgba(99, 102, 241, 0.08);
  border-left-color: rgba(99, 102, 241, 0.15);
  border-right-color: rgba(99, 102, 241, 0.15);
}

.prac-resizer:active {
  background-color: rgba(99, 102, 241, 0.15);
  border-left-color: var(--dd-accent);
  border-right-color: var(--dd-accent);
}

.prac-resizer::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2px;
  height: 20px;
  background: var(--dd-text-softer);
  border-radius: 2px;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.challenge-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  height: 240px;
  color: var(--dd-text-softer);
}
.challenge-loading p { font-size: 14px; }

.ca-spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--dd-border-soft);
  border-top-color: var(--dd-accent);
  border-radius: 50%;
  animation: ca-spin 0.75s linear infinite;
}
@keyframes ca-spin { to { transform: rotate(360deg); } }

.challenge-empty {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-align: center;
  padding: 20px;
}
.challenge-empty svg { font-size: 36px; color: var(--dd-text-softer); opacity: 0.5; }
.challenge-empty h3 { font-size: 15px; color: var(--dd-text-soft); font-family: var(--dd-font-display); }
.challenge-empty p { font-size: 13px; color: var(--dd-text-softer); line-height: 1.6; }
.challenge-empty h3::before { display: none; }
.challenge-content { display: none; }

.challenge-logs {
  width: 100%;
  max-width: 520px;
  margin-top: 6px;
  background: rgba(15, 23, 42, 0.35);
  border: 1px solid var(--dd-border-subtle);
  border-radius: var(--dd-radius-sm);
  padding: 12px 12px;
  text-align: left;
}
.challenge-log-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--dd-text-soft);
  padding: 6px 0;
  border-bottom: 1px dashed rgba(255,255,255,0.06);
}
.challenge-log-item:last-child { border-bottom: none; }
.challenge-log-badge {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  margin-top: 1px;
  border: 1px solid rgba(255,255,255,0.14);
}
.challenge-log-item--info .challenge-log-badge { background: rgba(59,130,246,0.15); color: var(--dd-info); border-color: rgba(59,130,246,0.25); }
.challenge-log-item--success .challenge-log-badge { background: rgba(46,204,113,0.13); color: var(--dd-success); border-color: rgba(46,204,113,0.25); }
.challenge-log-item--error .challenge-log-badge { background: rgba(255,92,122,0.12); color: var(--dd-danger); border-color: rgba(255,92,122,0.25); }
.challenge-log-text { flex: 1; }

.challenge-card {
  background: var(--dd-bg-soft);
  border: 1px solid var(--dd-border-subtle);
  border-radius: var(--dd-radius-md);
  padding: 20px;
  margin-bottom: 16px;
}
.challenge-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.ca-diff-badge {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--dd-font-display);
  padding: 3px 11px;
  border-radius: var(--dd-radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.ca-diff-badge.easy { background: rgba(46,204,113,0.15); color: var(--dd-success); border: 1px solid rgba(46,204,113,0.3); }
.ca-diff-badge.medium { background: rgba(245,158,11,0.15); color: var(--dd-warning); border: 1px solid rgba(245,158,11,0.3); }
.ca-diff-badge.hard { background: rgba(255,92,122,0.15); color: var(--dd-danger); border: 1px solid rgba(255,92,122,0.3); }

.challenge-view-btn {
  padding: 7px 12px;
  border-radius: var(--dd-radius-pill);
  border: 1px solid var(--dd-border-subtle);
  background: rgba(15, 23, 42, 0.35);
  color: var(--dd-text-soft);
  font-size: 12px;
  font-weight: 700;
  font-family: var(--dd-font-display);
  transition: all var(--dd-transition-fast);
}
.challenge-view-btn:hover {
  border-color: var(--dd-accent);
  color: var(--dd-accent);
  background: rgba(99,102,241,0.12);
}
.challenge-view-btn:disabled {
  opacity: 0.5;
  pointer-events: none;
}

.challenge-title {
  font-family: var(--dd-font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--dd-text);
  margin-bottom: 12px;
  padding-left: 0em !important;
  line-height: 1.3;
}
.challenge-title::before {
  display: none;
}
.challenge-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--dd-text-soft);
}
.challenge-desc code {
  background: var(--dd-bg-contrast);
  color: var(--dd-accent-2);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--dd-font-mono);
  font-size: 12.5px;
}
.challenge-desc ul { margin: 10px 0 10px 18px; }
.challenge-desc li { margin-bottom: 6px; }
.challenge-desc strong { color: var(--dd-text); font-weight: 600; }

.challenge-requirements {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--dd-border-subtle);
  transition: all var(--dd-transition-med);
  overflow: hidden;
}
.challenge-req-title {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--dd-font-display);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--dd-text-softer);
  margin-bottom: 10px;
}
.challenge-req-list { list-style: none; padding-left: 0em !important; }
.challenge-req-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13.5px;
  color: var(--dd-text-soft);
  margin-bottom: 8px;
  line-height: 1.5;
}

.hints-section { margin-top: 4px; }
.hints-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  background: var(--dd-bg-soft);
  border: 1px solid var(--dd-border-subtle);
  border-radius: var(--dd-radius-sm);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--dd-font-display);
  color: var(--dd-text-soft);
  transition: all var(--dd-transition-fast);
}
.hints-toggle:hover { border-color: var(--dd-warning); color: var(--dd-warning); background: rgba(245,158,11,0.08); }
.hints-toggle svg:first-child { color: var(--dd-warning); }
.hints-toggle svg:last-child { margin-left: auto; font-size: 11px; transition: transform var(--dd-transition-fast); }
.hints-toggle.open svg:last-child { transform: rotate(180deg); }
.hints-list {
  margin-top: 8px;
  background: var(--dd-bg-soft);
  border: 1px solid var(--dd-border-subtle);
  border-radius: var(--dd-radius-sm);
  overflow: hidden;
}
.hint-item {
  display: flex;
  gap: 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--dd-border-subtle);
  font-size: 13.5px;
  color: var(--dd-text-soft);
  line-height: 1.6;
}
.hint-item:last-child { border-bottom: none; }
.hint-num {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: rgba(245,158,11,0.15);
  color: var(--dd-warning);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
  font-family: var(--dd-font-display);
}

.prac-editor-panel {
  grid-column: 3;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--dd-bg-contrast);
}
.editor-panel-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  height: 46px;
  border-bottom: 1px solid var(--dd-border-subtle);
  flex-shrink: 0;
  background: #0c1322;
}
.editor-file-tabs {
  display: flex;
  gap: 0;
}
.editor-file-tab {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 16px;
  height: 46px;
  font-size: 12.5px;
  font-weight: 600;
  font-family: var(--dd-font-display);
  color: var(--dd-text-softer);
  border-bottom: 2px solid transparent;
  transition: all var(--dd-transition-fast);
}
.editor-file-tab:hover { color: var(--dd-text-soft); }
.editor-file-tab.active { color: var(--dd-text); border-bottom-color: var(--dd-accent); }
.editor-file-tab svg { font-size: 13px; color: inherit !important; }

.svg-icon.html {color: #e34f26 !important;}
.svg-icon.css {color: #264de4 !important;}
.svg-icon.javascript {color: #f7df1e !important;}
.svg-icon.lang {color: #6366f1 !important;}

/* Challenge popup modal (iframe isolated) */
.ca-challenge-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 18px;
}
.ca-challenge-modal[aria-hidden="false"] { display: flex; }
.ca-challenge-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.68);
  backdrop-filter: blur(3px);
}
.ca-challenge-modal__panel {
  position: relative;
  width: min(980px, 100%);
  height: min(680px, 90vh);
  border-radius: var(--dd-radius-lg);
  background: var(--dd-bg-contrast);
  border: 1px solid var(--dd-border-subtle);
  box-shadow: 0 18px 55px rgba(0,0,0,0.55);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.ca-challenge-modal__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px;
  background: #0c1322;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.ca-challenge-modal__title {
  font-family: var(--dd-font-display);
  font-size: 13px;
  font-weight: 800;
  color: var(--dd-text);
  letter-spacing: 0.02em;
}
.ca-challenge-modal__close {
  width: 34px;
  height: 34px;
  border-radius: var(--dd-radius-sm);
  border: 1px solid rgba(255,255,255,0.09);
  background: rgba(15, 23, 42, 0.35);
  color: var(--dd-text-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--dd-transition-fast);
}
.ca-challenge-modal__close:hover {
  border-color: var(--dd-accent);
  color: var(--dd-accent);
  background: rgba(99,102,241,0.12);
}
.ca-challenge-modal__iframe {
  flex: 1;
  width: 100%;
  height: min(680px, 80vh);
  border: none;
  background: #fff;
}

.editor-view-tabs {
  display: flex;
  gap: 4px;
}
.editor-view-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--dd-radius-sm);
  font-size: 12px;
  font-weight: 600;
  font-family: var(--dd-font-display);
  color: var(--dd-text-softer);
  border: 1px solid transparent;
  transition: all var(--dd-transition-fast);
}
.editor-view-tab:hover { color: var(--dd-text-soft); background: var(--dd-bg-soft); }
.editor-view-tab.active { color: var(--dd-text); background: var(--dd-bg-soft); border-color: var(--dd-border-subtle); }

.editor-body {
  flex: 1;
  position: relative;
  overflow: hidden;
}
.editor-code-pane {
  display: flex;
  height: 100%;
  position: relative;
}
.editor-code-pane.hidden { display: none; }
.editor-preview-pane {
  height: 100%;
  display: none;
  background: #fff;
}
.editor-preview-pane.active { display: flex; flex-direction: column; }
.editor-preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: #1a1a2e;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
}
.editor-preview-toolbar span { font-size: 11px; color: var(--dd-text-softer); font-family: var(--dd-font-display); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; }
.editor-preview-refresh {
  font-size: 12px;
  color: var(--dd-text-softer);
  padding: 3px 8px;
  border-radius: 5px;
  transition: all var(--dd-transition-fast);
}
.editor-preview-refresh:hover { background: var(--dd-accent-soft); color: var(--dd-accent); }
.editor-iframe {
  flex: 1;
  border: none;
  background: #fff;
}

.editor-line-nums {
  width: 46px;
  overflow: hidden;
  padding: 14px 8px 14px 0;
  text-align: right;
  font-family: var(--dd-font-mono);
  font-size: 12.5px;
  line-height: 1.80;
  color: var(--dd-text-softer);
  user-select: none;
  flex-shrink: 0;
  border-right: 1px solid var(--dd-border-subtle);
  background: rgba(0,0,0,0.15);
  white-space: pre;
}
.editor-textarea {
  flex: 1;
  resize: none;
  background: transparent;
  border: none;
  outline: none;
  color: #abb2bf;
  font-family: var(--dd-font-mono);
  font-size: 13.5px;
  line-height: 1.65;
  padding: 14px 16px;
  tab-size: 2;
  caret-color: var(--dd-accent);
  overflow-y: auto;
}

/* Syntax error highlighting */
.syntax-error-line {
  background: var(--dd-syntax-error) !important;
  color: var(--dd-syntax-error-text) !important;
  font-weight: 600;
  border-radius: 3px;
  transition: all var(--dd-transition-fast);
  padding: 2px 4px;
  margin: 2px 0;
  border-radius: 4px;
  text-decoration: underline;
  text-decoration-color: var(--dd-syntax-error-text);
  text-decoration-style: wavy;
  text-underline-offset: 2px;
}

/* CodeMirror 6 syntax error styling */
.cm-syntax-error-line {
  background: rgba(255, 92, 122, 0.15) !important;
  border-left: 3px solid #ff5c7a;
  position: relative;
  transition: background-color 0.2s ease;
}

.cm-syntax-error-line:hover {
  background: rgba(255, 92, 122, 0.25) !important;
}

.cm-syntax-error-tooltip {
  position: fixed;
  background: #ff5c7a;
  color: white;
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 12px;
  white-space: nowrap;
  z-index: 10000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  font-family: 'Fira Code', monospace;
}

.cm-syntax-error-tooltip::after {
  content: '';
  position: absolute;
  top: -4px;
  left: 8px;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 4px solid #ff5c7a;
}

@keyframes syntax-error-pulse {
  0%, 100% { background: var(--dd-syntax-error); }
  50% { background: rgba(255, 92, 122, 0.08); }
}

@keyframes syntax-error-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.editor-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--dd-border-subtle);
  background: #0c1322;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.editor-status {
  flex: 1;
  font-size: 12px;
  color: var(--dd-text-softer);
  display: flex;
  align-items: center;
  gap: 6px;
}
.editor-status-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--dd-text-softer);
}
.editor-status-dot.ready { background: var(--dd-success); }
.editor-status-dot.thinking { background: var(--dd-warning); animation: ca-pulse 1s infinite; }
@keyframes ca-pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.ca-submit-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 22px;
  background: linear-gradient(135deg, var(--dd-accent), var(--dd-accent-strong));
  border-radius: var(--dd-radius-pill);
  font-size: 13px;
  font-weight: 700;
  font-family: var(--dd-font-display);
  color: #fff;
  letter-spacing: 0.02em;
  transition: all var(--dd-transition-fast);
  box-shadow: 0 4px 14px rgba(99,102,241,0.3);
  white-space: nowrap;
  flex-shrink: 0;
}
.ca-submit-btn:hover { transform: translateY(-1px); }
.ca-submit-btn:active { transform: translateY(0); }
.ca-submit-btn:disabled { opacity: 0.5; pointer-events: none; }
.ca-submit-btn.loading { opacity: 0.75; pointer-events: none; }
.ca-submit-btn.loading .btn-text { display: none; }

.prac-result {
  flex-shrink: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.42s cubic-bezier(0.33,1,0.68,1);
  border-top: 1px solid transparent;
}
.prac-result.visible {
  max-height: 200px;
  border-top-color: var(--dd-border-subtle);
}

.result-inner {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.result-icon-wrap {
  width: 44px; height: 44px;
  border-radius: var(--dd-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.result-inner.pass svg { color: var(--dd-success); }
.result-inner.fail svg { color: var(--dd-danger); }
.result-text { flex: 1; min-width: 180px; }
.result-title {
  font-family: var(--dd-font-display);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 3px;
}
.result-inner.pass .result-title { color: var(--dd-success); }
.result-inner.fail .result-title { color: var(--dd-danger); }
.result-feedback { font-size: 13px; color: var(--dd-text-soft); line-height: 1.6; }
.result-score {
  font-size: 22px;
  font-weight: 800;
  font-family: var(--dd-font-display);
  color: #f7df1e;
  flex-shrink: 0;
}
.result-score span { font-size: 13px; font-weight: 500; color: var(--dd-text-softer); display: block; text-align: center; }

.result-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.ca-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: var(--dd-radius-pill);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--dd-font-display);
  transition: all var(--dd-transition-fast);
  white-space: nowrap;
  letter-spacing: 0.01em;
}
.ca-btn-ghost {
  background: transparent;
  border: 1px solid var(--dd-border-subtle);
  color: var(--dd-text-soft);
}
.ca-btn-ghost:hover { border-color: var(--dd-accent); color: var(--dd-accent); background: var(--dd-accent-soft); }
.ca-btn-accent {
  background: var(--dd-accent);
  color: #fff;
  border: 1px solid transparent;
}
.ca-btn-accent:hover { background: var(--dd-accent-strong); }
.ca-btn-success {
  background: rgba(46,204,113,0.15);
  color: var(--dd-success);
  border: 1px solid rgba(46,204,113,0.3);
}
.ca-btn-success:hover { background: rgba(46,204,113,0.25); }

.ca-nav-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--dd-radius-pill);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--dd-font-display);
  color: var(--dd-text-soft);
  border: 1px solid var(--dd-border-subtle);
  background: var(--dd-bg-soft);
  transition: all var(--dd-transition-fast);
}
.ca-nav-btn:hover { border-color: var(--dd-accent); color: var(--dd-accent); background: var(--dd-accent-soft); }
.ca-nav-btn:disabled { opacity: 0.3; pointer-events: none; }

.ca-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  height: 100%;
  padding: 40px 20px;
  text-align: center;
}
.ca-empty-state-icon {
  width: 72px; height: 72px;
  border-radius: var(--dd-radius-lg);
  background: var(--dd-bg-soft);
  border: 1px solid var(--dd-border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--dd-accent);
  margin-bottom: 4px;
}
.ca-empty-state h3 {
  font-family: var(--dd-font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--dd-text);
  margin-bottom: 6px;
}
.ca-empty-state p { font-size: 14px; color: var(--dd-text-softer); line-height: 1.7; max-width: 360px; }

.ca-error-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 30px 20px;
  text-align: center;
}
.ca-error-panel svg { font-size: 28px; color: var(--dd-danger); }
.ca-error-panel h4 { font-family: var(--dd-font-display); font-size: 15px; font-weight: 700; color: var(--dd-text); }
.ca-error-panel p { font-size: 13px; color: var(--dd-text-softer); line-height: 1.6; }

/* Notification System */
.ca-notification {
  position: fixed;
  display: flex;
  top: 20px;
  right: 20px;
  z-index: 9999;
  max-width: 400px;
  background: #000000;
  border: 1px solid var(--dd-border);
  border-radius: var(--dd-radius);
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  animation: ca-notification-slide-in 0.3s ease-out;
}

.ca-notification-content {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
}

.ca-notification-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.ca-notification-message {
  flex: 1;
  font-size: 14px;
  line-height: 1.4;
  color: var(--dd-text);
}

.ca-notification-close {
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  padding: 5px;
  color: var(--dd-text-softer);
  cursor: pointer;
  border-radius: var(--dd-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--dd-transition-fast);
}

.ca-notification-close:hover {
  background: var(--dd-bg-soft);
  color: var(--dd-text);
}

.ca-notification-success .ca-notification-icon {
  color: var(--dd-success);
}

.ca-notification-error .ca-notification-icon {
  color: var(--dd-danger);
}

.ca-notification-info .ca-notification-icon {
  color: var(--dd-info);
}

@keyframes ca-notification-slide-in {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes ca-fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.ca-animate-in { animation: ca-fadeSlideIn 0.36s cubic-bezier(0.33,1,0.68,1) both; }

@keyframes ca-fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (max-width: 1023px) {
  :root { --ca-sidebar-w: 288px; }
  .ca-sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    transform: translateX(-100%);
    transition: transform var(--dd-transition-slow);
  }
  .ca-sidebar.mobile-open { transform: translateX(0); }
  .ca-topbar-menu { display: flex; }
  .ca-brand__close { display: flex; }
  .prac-diff-tabs .prac-diff-tab-label { display: none; }
  .prac-diff-tab { padding: 6px 10px; }
}

@media (max-width: 820px) {
  .prac-split {
    grid-template-columns: 1fr;
    grid-template-rows: auto 12px 1fr;
    overflow: hidden;
    height: 100%;
    min-height: 400px;
  }
  
  .prac-resizer {
    grid-column: 1;
    grid-row: 2;
    position: relative;
    width: 100%;
    height: 12px;
    cursor: w-resize;
    transition: opacity 0.2s ease;
    border-left: 3px solid transparent;
    border-right: 3px solid transparent;
    border-top: 1px solid var(--dd-border-subtle);
    border-bottom: 1px solid var(--dd-border-subtle);
    background: rgba(99, 102, 241, 0.02);
  }
  
  .prac-resizer::before {
    width: 24px;
    height: 3px;
    background: linear-gradient(to right, transparent, var(--dd-text-softer), transparent);
  }
  
  .prac-challenge-panel {
    grid-column: 1;
    grid-row: 1;
    border-right: none;
    border-bottom: 1px solid var(--dd-border-subtle);
    min-height: 150px;
    max-height: 60vh;
    overflow-y: auto;
  }
  .prac-editor-panel { 
    grid-column: 1;
    grid-row: 3;
    min-height: 250px;
    flex: 1;
    overflow: hidden;
  }
  .prac-result.visible { max-height: 280px; }
  .result-inner { flex-direction: column; align-items: flex-start; gap: 12px; }
  .result-score { align-self: flex-end; }
}

@media (max-width: 640px) {
  .tut-mark-done-btn { width: fit-content; margin: 0 auto !important; }
  .ca-sidebar { z-index: 50; }
  #view-tutorial > .tut-wrap { padding: 24px 16px 60px; }
  .tut-title { font-size: 22px; }
  .tut-footer-top { flex-direction: column; align-items: stretch; }
  .tut-footer-nav { justify-content: space-between; }
  .prac-header { padding: 0 12px; gap: 8px; height: auto; min-height: var(--ca-prac-header-h); padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; }
  .prac-header-back span { display: none; }
  .prac-header-back { padding: 7px 10px; }
  .ca-topbar { padding: 0 14px; }
  .ca-topbar-crumb .ca-crumb-item:not(.active):not(:last-child) { display: none; }
  .ca-topbar-crumb svg:not(:last-of-type) { display: none; }
  .editor-footer { flex-wrap: wrap; }
  .editor-status { flex: 0 0 100%; order: 2; }
  .ca-submit-btn { flex: 1; justify-content: center; }
  .prac-challenge-panel { max-height: 260px; padding: 16px 14px; }
  .challenge-card { padding: 16px; }
  .result-actions { flex-direction: column; width: 100%; }
  .result-actions .ca-btn { justify-content: center; }
}

@media (max-width: 420px) {
  .prac-diff-tabs { gap: 2px; padding: 2px; }
  .prac-diff-tab { padding: 5px 8px; font-size: 11px; gap: 4px; }
}

/* Additional CSS for WordPress templates */

/* Courses Grid Styles */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  padding: 40px 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.course-card {
  background: var(--dd-bg);
  border: 1px solid var(--dd-border-subtle);
  border-radius: var(--dd-radius-md);
  padding: 24px;
  transition: all var(--dd-transition-fast);
}

.course-card:hover {
  border-color: var(--dd-accent);
  box-shadow: 0 4px 12px rgba(99,102,241,0.1);
  transform: translateY(-2px);
}

.course-card h2 {
  margin: 0 0 12px 0;
  font-size: 20px;
  font-weight: 700;
}

.course-card h2 a {
  color: var(--dd-text);
  text-decoration: none;
}

.course-card h2 a:hover {
  color: var(--dd-accent);
}

.course-card p {
  color: var(--dd-text-soft);
  line-height: 1.6;
  margin-bottom: 16px;
}

.course-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  color: var(--dd-text-softer);
}

.course-count {
  background: var(--dd-bg-soft);
  padding: 4px 8px;
  border-radius: var(--dd-radius-pill);
  font-weight: 600;
}

/* Course Overview Styles */
.course-overview {
  padding: 40px 32px;
  max-width: 800px;
  margin: 0 auto;
}

.course-description {
  font-size: 16px;
  line-height: 1.7;
  color: var(--dd-text-soft);
  margin-bottom: 32px;
  padding: 24px;
  background: var(--dd-bg-soft);
  border-radius: var(--dd-radius-md);
  border: 1px solid var(--dd-border-subtle);
}

.course-lessons {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.course-chapter {
  background: var(--dd-bg);
  border: 1px solid var(--dd-border-subtle);
  border-radius: var(--dd-radius-md);
  padding: 24px;
}

.chapter-title {
  font-family: var(--dd-font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--dd-text);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.editor-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--dd-text-softer);
  padding: 8px 12px;
  background: var(--dd-bg-soft);
  border-radius: var(--dd-radius-pill);
  border: 1px solid var(--dd-border-subtle);
  margin-bottom: 16px;
}

.editor-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--dd-text-softer);
}

.editor-status-dot.ready { 
  background: var(--dd-success); 
}

.editor-status-dot.thinking { 
  background: var(--dd-warning); 
  animation: ca-pulse 1s infinite; 
}

@keyframes ca-pulse { 
  0%,100% { opacity: 1; } 
  50% { opacity: 0.4; } 
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .course-overview {
    padding: 24px 16px;
  }
  
  .course-description {
    padding: 16px;
    margin-bottom: 24px;
  }
  
  .course-chapter {
    padding: 16px;
  }
  
  .lesson-item {
    padding: 12px;
  }
  
  .lesson-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

img {
  max-width: 100%;
  display: block;
}

button {
  font-family: inherit;
}

.dd-main {
  padding: calc(var(--dd-section-padding-y) * 0.6) 1.25rem
    calc(var(--dd-section-padding-y) * 1.1);
}

@media (max-width: 768px) {
  .dd-main {
    padding: calc(var(--dd-section-padding-y) * 0.5) 1rem calc(var(--dd-section-padding-y) * 0.8);
  }
}

@media (max-width: 540px) {
  .dd-main {
    padding: calc(var(--dd-section-padding-y) * 0.4) 0.85rem calc(var(--dd-section-padding-y) * 0.6);
  }
}

.dd-single-post-container {
  max-width: 1500px;
  margin: 0 auto;
}

.try-button {
  display: inline-block;
  margin-top: 1rem;
  margin-bottom: 1rem;
  padding: 0.75rem 1.25rem;
  font-family: var(--dd-font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--dd-text) !important;
  text-underline-offset: 0px !important;
  background: var(--dd-accent);
  border: none;
  border-radius: 5px;
  text-decoration: none !important;
  cursor: pointer;
  transition: background var(--dd-transition-med), transform var(--dd-transition-fast), box-shadow var(--dd-transition-fast) !important;
}

.try-button:hover {
    background-color: #4f46e5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.try-button:active {
    transform: translateY(0);
}

.try-button svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

/* Light theme adjustment */
@media (prefers-color-scheme: light) {
    .try-button {
        background-color: #4f46e5;
    }
    
    .try-button:hover {
        background-color: #4338ca;
    }
}

.dd-post-content {
    background: linear-gradient(135deg, var(--bg-deep) 0%, rgba(15, 23, 42, 0.8) 100%);
    color: var(--text-main);
    position: relative;
    overflow-x: hidden;
}

.dd-post-content h1,
.dd-post-content h2,
.dd-post-content h3,
.dd-post-content h4,
.dd-post-content h5,
.dd-post-content h6 {
    color: var(--text-main);
    line-height: 1.3;
    position: relative;
    letter-spacing: -0.02em;
    width: fit-content;
}

.dd-post-content h1 {
    font-size: 2em;
    margin: 0.67em 0;
    padding-bottom: 0.5em;
    border-bottom: 3px solid var(--dd-accent);
}

.dd-post-content h2 {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--dd-font-display);
    font-size: 1.5em;
    margin: 0 0 0.7rem;
}

.dd-post-content h3 {
    position: relative;
    padding-left: 1.1em;
    font-size: 1.17em;
    font-weight: 600;
    color: rgba(248, 250, 252, 0.96);
}

.dd-post-content h3::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 70%;
    border-radius: var(--dd-radius-pill);
    background: var(--dd-accent);
}

.dd-post-content h4 {
    font-size: 1em;
    margin: 1em 0;
    color: rgba(248, 250, 252, 0.9);
}

.dd-post-content h5 {
    font-size: 0.83em;
    margin: 1.17em 0;
    color: rgba(248, 250, 252, 0.9);
    font-weight: 700;
}

.dd-post-content h6 {
    font-size: 0.67em;
    margin: 1.33em 0;
    color: var(--text-dim);
    font-weight: 700;
}

.dd-post-content a {
    color: var(--dd-accent);
    text-decoration: underline dashed;
    text-underline-offset: 3px;
    transition: color 0.2s ease;
}

.dd-post-content a:hover {
    color: var(--dd-accent-2);
}

.dd-post-content p {
    font-size: 1em;
    line-height: 1.8;
    margin: 1em 0;
    color: rgba(248, 250, 252, 0.9);
}

.dd-post-content p+p {
    margin-top: 1.5rem;
}

.dd-post-content ul {
    margin: 1em 0;
    padding-left: 2em;
    list-style: none;
}

.dd-post-content ul li,
.dd-post-content ol li {
    margin: 0.5em 0;
    padding-left: 1.8rem;
    position: relative;
    font-size: 1em;
    line-height: 1.7;
    color: rgba(248, 250, 252, 0.85);
}

.dd-post-content ul li::before {
    content: '';
    position: absolute;
    left: 0.3rem;
    top: 0.6rem;
    width: 0.5rem;
    height: 0.5rem;
    background: var(--dd-accent);
    border-radius: 50%;
}

.dd-no-before li::before {
    display: none !important;
    left: inherit !important;
    top: inherit !important;
    width: inherit !important;
    height: inherit !important;
    background: inherit !important;
    border-radius: inherit !important;
}

.dd-no-before li {
  margin: inherit !important;
  padding-left: inherit !important;
  position: inherit !important;
  font-size: inherit !important;
  line-height: inherit !important;
  color: inherit !important;
}

.dd-post-content ol {
    counter-reset: item;
    padding-left: 0;
}

.dd-post-content ol li {
    counter-increment: item;
    padding-left: 2.5rem;
}

.dd-post-content ol li::before {
    content: counter(item);
    position: absolute;
    left: 0;
    top: 0.1rem;
    color: var(--dd-accent);
    font-weight: 700;
    font-size: 1rem;
    min-width: 2rem;
}

.dd-post-content code {
    background: rgba(0, 0, 0, 0.4);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875em;
    color: var(--dd-cyan);
    border: 1px solid rgba(6, 182, 212, 0.25);
}

.dd-post-content pre {
    margin: 1em 0;
    position: relative;
    font-size: 0.875em;
    padding: 0 !important;
    overflow: hidden !important;
    white-space: pre !important;
}

.dd-post-content pre code {
    background: none;
    border: none;
    color: #e0e7ff;
    font-size: 1em;
    line-height: 1.6;
    padding: 1em !important;
    display: block !important;
    overflow: auto;
}

.dd-post-content blockquote {
    border-left: 4px solid var(--dd-accent);
    margin: 1em 0;
    padding: 1em;
    background: rgba(99, 102, 241, 0.06);
    border-radius: 6px;
    color: rgba(248, 250, 252, 0.85);
    position: relative;
    font-style: italic;
    font-size: 1em;
    line-height: 1.7;
}

.dd-post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
    border-radius: 8px;
    overflow: hidden;
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid rgba(99, 102, 241, 0.25);
    font-size: 1em;
}

.dd-post-content table thead {
    background: rgba(99, 102, 241, 0.1);
}

.dd-post-content table th {
    padding: 0.75em 1em;
    text-align: left;
    color: var(--dd-accent);
    font-weight: 700;
    font-size: 1em;
    border-bottom: 1px solid rgba(99, 102, 241, 0.3);
}

.dd-post-content table td {
    padding: 0.75em 1em;
    border-bottom: 1px solid rgba(99, 102, 241, 0.15);
    color: rgba(248, 250, 252, 0.8);
    font-size: 1em;
}

.dd-post-content table tbody tr:hover {
    background: rgba(99, 102, 241, 0.08);
}

.dd-post-content hr {
    border: none;
    height: 1px;
    background: rgba(99, 102, 241, 0.25);
    margin: 3rem 0;
}

.dd-post-content strong,
.dd-post-content b {
    color: var(--text-main);
    font-weight: 700;
}

.dd-post-content em,
.dd-post-content svg {
    color: var(--text-main);
    font-style: italic;
}

.dd-post-content dl {
    margin: 1em 0;
}

.dd-post-content dt {
    font-weight: 700;
    color: var(--dd-accent);
    margin-top: 1em;
    margin-bottom: 0.25em;
    font-size: 1em;
}

.dd-post-content dd {
    margin-left: 1.5em;
    margin-bottom: 1em;
    color: rgba(248, 250, 252, 0.8);
    line-height: 1.7;
    font-size: 1em;
}

.dd-post-content-button,
.dd-post-content .btn-custom {
    background: var(--dd-accent);
    color: #fff;
    padding: 0.5em 1em;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    margin: 0.5em 0.25em 0.5em 0;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
}

.dd-post-content .btn-custom:hover {
    background: var(--accent-strong);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.35);
    transform: translateY(-1px);
}

*/ .dd-post-content mark {
    background: rgba(236, 72, 153, 0.2);
    padding: 0.1em 0.3em;
    border-radius: 3px;
    color: inherit;
}

.dd-post-content small {
    color: var(--text-dim);
    font-size: 0.8em;
}

@media (max-width: 1024px) {
    .dd-post-content {
        font-size: 15px;
    }

    .dd-post-content h1 {
        font-size: 1.75em;
    }

    .dd-post-content h2 {
        font-size: 1.35em;
    }

    .dd-post-content h3 {
        font-size: 1.1em;
    }

    .dd-post-content p {
        font-size: 1em;
    }
}

@media (max-width: 768px) {
    .file-actions {
        opacity: 1;
    }
    .dd-code-symbol {
        font-size: 12px;
    }
    .dd-post-content {
        font-size: 14px;
    }

    .dd-post-content h1 {
        font-size: 1.8em;
        margin-bottom: 0.5em;
        padding-bottom: 0.4em;
    }

    .dd-post-content h2 {
        font-size: 1.4em;
        margin-top: 1em;
        padding-bottom: 0.4em;
    }

    .dd-post-content h3 {
        font-size: 1.15em;
    }

    .dd-post-content h4 {
        font-size: 1em;
    }

    .dd-post-content p {
        font-size: 1em;
        line-height: 1.7;
    }

    .dd-post-content ul,
    .dd-post-content ol {
        padding-left: 1.5em;
        margin: 0.8em 0;
    }

    .dd-post-content ul li,
    .dd-post-content ol li {
        font-size: 1em;
        margin: 0.4em 0;
    }

    .dd-post-content ol li {
        padding-left: 1.8em;
    }

    .dd-post-content table {
        margin: 1em 0;
    }

    .dd-post-content table th,
    .dd-post-content table td {
        padding: 0.5em 0.75em;
    }

    .dd-post-content pre {
        padding: 0.75em;
        font-size: 0.8em;
        margin: 1em 0;
    }

    .dd-post-content blockquote {
        padding: 0.75em;
        font-size: 1em;
        margin: 1em 0;
    }

    .dd-post-content button,
    .dd-post-content .btn-custom {
        font-size: 0.9em;
        margin: 0.5em 0.25em 0.5em 0;
    }
}

@media (max-width: 480px) {
    .dd-post-content {
        font-size: 13px;
    }

    .dd-post-content h1 {
        font-size: 1.7em;
        padding-bottom: 0.3em;
        margin: 0.5em 0;
    }

    .dd-post-content h2 {
        font-size: 1.3em;
        padding-bottom: 0.3em;
        margin-top: 0.8em;
    }

    .dd-post-content h3 {
        font-size: 1.1em;
    }

    .dd-post-content h4 {
        font-size: 0.95em;
    }

    .dd-post-content h5 {
        font-size: 0.8em;
    }

    .dd-post-content h6 {
        font-size: 0.65em;
    }

    .dd-post-content p {
        font-size: 1em;
        line-height: 1.65;
        margin: 0.7em 0;
    }

    .dd-post-content ul,
    .dd-post-content ol {
        padding-left: 1.2em;
        margin: 0.8em 0;
    }

    .dd-post-content ul li::before {
        left: 0.2rem;
        top: 0.65rem;
        width: 0.35rem;
        height: 0.35rem;
    }

    .dd-post-content ol li {
        padding-left: 1.8em;
    }

    .dd-post-content ol li::before {
        font-size: 0.85em;
    }

    .dd-post-content ul li,
    .dd-post-content ol li {
        font-size: 1em;
        margin: 0.3em 0;
    }

    .dd-post-content table {
        margin: 0.8em 0;
    }

    .dd-post-content table th,
    .dd-post-content table td {
        padding: 0.4em;
    }

    .dd-post-content code {
        font-size: 0.8em;
    }

    .dd-post-content pre {
        padding: 0.6em;
        font-size: 0.75em;
        margin: 0.8em 0;
    }

    .dd-post-content blockquote {
        border-left: 3px solid var(--dd-accent);
        padding: 0.6em;
        font-size: 1em;
        margin: 0.8em 0;
    }

    .dd-post-content button,
    .dd-post-content .btn-custom {
        font-size: 0.85em;
        margin: 0.4em 0.2em 0.4em 0;
    }

    .dd-post-content img {
        margin: 1em 0;
        border-radius: 8px;
    }

    .dd-post-content hr {
        margin: 1.5em 0;
    }

    .dd-post-content dl {
        margin: 0.8em 0;
    }

    .dd-post-content dt {
        margin-top: 0.8em;
        margin-bottom: 0.2em;
    }

    .dd-post-content dd {
        margin-left: 1.2em;
        margin-bottom: 0.8em;
    }
}

.dd-section-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  background: rgba(15, 23, 42, 1);
  border: 1px solid rgba(129, 140, 248, 0.8);
  color: #e0e7ff;
}

.dd-post-content li::marker {
  color: var(--dd-accent);
}

.dd-tech-grid {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

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

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

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

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

@media (max-width: 1023px) and (min-width: 768px) {
  .dd-grid-tablet-1 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
  .dd-grid-tablet-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .dd-grid-tablet-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .dd-grid-mobile-1 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
  .dd-grid-mobile-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}


@media (max-width: 768px) {
  .dd-tech-grid {
    gap: 0.6rem;
    margin-top: 0.6rem;
  }
}

@media (max-width: 540px) {
  .dd-tech-grid {
    gap: 0.5rem;
    margin-top: 0.5rem;
  }
}

.dd-tech-card {
  border-radius: var(--dd-radius-md);
  border: 1px solid rgba(148, 163, 184, 0.32);
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.7));
  padding: 0.7rem 0.75rem;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 0.55rem;
  row-gap: 0.2rem;
  align-items: center;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  will-change: transform;
}

.dd-tech-card:hover {
  transform: translateY(-2px);
  border-color: rgba(129, 140, 248, 0.85);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.9);
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.98), rgba(30, 64, 175, 0.65));
}

.dd-tech-icon {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(129, 140, 248, 0.85);
  color: #c7d2fe;
  font-size: 1rem;
}

.dd-tech-label {
  font-weight: 600;
  font-size: 0.9rem;
}

.dd-tech-card p {
  grid-column: 1 / -1;
  font-size: 0.8rem;
  margin: 0.1rem 0 0;
  color: var(--dd-text-softer);
}

/* Callout */
.dd-callout {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.8rem;
  margin: 0.5rem 0 0.9rem;
  padding: 0.85rem 0.9rem;
  border-radius: var(--dd-radius-md);
  border: 1px solid rgba(129, 140, 248, 0.5);
  background: rgba(15, 23, 42, 0.9);
}

.dd-callout-icon {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 1);
  border: 1px solid rgba(129, 140, 248, 0.7);
  color: #a5b4fc;
}

.dd-callout-content h3 {
  margin: 0 0 0.3rem;
  font-size: 0.98rem;
}

.dd-callout-content p {
  margin: 0;
  font-size: 0.86rem;
  color: var(--dd-text-soft);
}

/* Code blocks */
.dd-code-block {
  border-radius: var(--dd-radius-md);
  border: 1px solid rgba(30, 64, 175, 0.7);
  background: radial-gradient(circle at 0 0, rgba(15, 23, 42, 1), rgba(15, 23, 42, 0.95));
  overflow: hidden;
  margin: 0.75rem 0;
}

.dd-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.6rem 0.4rem;
  background: rgba(30, 64, 175, 0.7);
}

.dd-code-lang {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: #e5e7eb;
}

.dd-code-lang svg {
  font-size: 0.85rem;
}

.dd-code-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border-radius: var(--dd-radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.9);
  color: var(--dd-text-soft);
  padding: 0.22rem 0.6rem;
  font-size: 0.78rem;
  cursor: pointer;
  transition: background var(--dd-transition-fast), transform var(--dd-transition-fast),
    border-color var(--dd-transition-fast);
}

.dd-code-copy-btn:hover {
  background: rgba(15, 23, 42, 1);
  border-color: rgba(248, 250, 252, 0.85);
  transform: translateY(-1px);
}

.dd-code-copy-btn.copied {
  border-color: var(--dd-success);
  color: #bbf7d0;
}

.dd-code-block pre {
  margin: 0;
  padding: 0.7rem 0.85rem 0.8rem;
  font-size: 0.78rem;
  color: #d4d4d4;
  background: #1e1e1e;
  overflow-x: auto;
}

/* Two-column cards */
.dd-two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 0.6rem;
}

@media (max-width: 768px) {
  .dd-two-column {
    gap: 0.8rem;
    margin-top: 0.5rem;
  }
}

@media (max-width: 540px) {
  .dd-two-column {
    grid-template-columns: 1fr;
    gap: 0.6rem;
    margin-top: 0.4rem;
  }
}

.dd-two-column-card {
  border-radius: var(--dd-radius-md);
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(15, 23, 42, 0.98);
  padding: 0.8rem 0.85rem;
}

.dd-two-column-card h3 {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.dd-two-column-card h3 svg {
  font-size: 1rem;
}

.dd-two-column-card p {
  margin: 0 0 0.4rem;
  font-size: 0.88rem;
}

/* Tutorial Featured Card Styles */
.tut-header {
  margin: 0 0 2.5rem 0;
  padding: 0;
}

.tut-featured-card {
  background: rgba(15, 23, 42, 0.98);
  border-radius: var(--dd-radius-lg);
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.4fr);
  gap: 0;
  contain: layout style;
}

.tut-featured-media {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.tut-featured-img {
  width: 100%;
  height: 100%;
  min-height: 230px;
  object-fit: cover;
  transform: scale(1.02);
  transition: transform 0.5s cubic-bezier(0.33, 1, 0.68, 1);
  will-change: transform;
}

.tut-featured-card:hover .tut-featured-img {
  transform: scale(1.12);
}

.tut-featured-overlay {
  position: absolute;
  inset: 0;
}

.tut-featured-body {
  padding: 1.75rem 1.9rem 1.9rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.1rem;
}

.tut-title {
  margin: 0 !important;
  border-bottom: none !important;
}

.tut-excerpt {
  margin: 0 !important;
  font-size: 0.98rem;
  color: rgba(248, 250, 252, 0.7);
  max-width: 34rem;
  line-height: 1.6;
}

.dd-no-marker li {
  padding-left: 1.8rem !important;
  list-style: none !important;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .tut-featured-card {
    grid-template-columns: minmax(0, 1fr);
  }
  
  .tut-featured-media {
    max-height: 260px;
  }
}

@media (max-width: 768px) {
  .tut-featured-card {
    border-radius: var(--dd-radius-md);
  }
  
  .tut-featured-body {
    padding: 1.2rem 1.25rem 1.25rem;
  }
  
  .tut-title {
    font-size: clamp(1.4rem, 5vw, 1.95rem);
    margin-bottom: 0.6rem;
  }
  
  .tut-excerpt {
    font-size: 0.95rem;
    margin-bottom: 1rem;
  }
}

@media (max-width: 540px) {
  .tut-featured-body {
    padding: 1.2rem 1.2rem 1.3rem;
  }
  
  .tut-featured-card {
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.9);
  }
  
  .tut-title {
    font-size: clamp(1.2rem, 6vw, 1.6rem);
    line-height: 1.2;
    margin-bottom: 0.5rem;
  }
  
  .tut-excerpt {
    font-size: 0.9rem;
    line-height: 1.5;
  }
}