:root {
  color-scheme: light;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --bg: #eef2f8;
  --surface: #ffffff;
  --surface-soft: #f6f9ff;
  --text: #0b1220;
  --muted: #4b5b73;
  --border: #d8e0ec;
  --border-strong: #b7c3d8;
  --primary: #0f1f39;
  --navy: #182f56;
  --navy-soft: #29477a;
  --accent: #facc15;
  --accent-soft: #fef9c3;
  --tag-bg: #102544;
  --tag-text: #fde68a;
  --on-dark: #f8fafc;
  --success: #0f766e;
  --danger: #b91c1c;
  --card-shadow: 0 14px 34px rgba(15, 31, 57, 0.11);
  --card-shadow-hover: 0 18px 40px rgba(15, 31, 57, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 700px at -5% -15%, #fff8dc 0%, rgba(255, 248, 220, 0) 52%),
    radial-gradient(950px 560px at 105% -18%, #dce7fb 0%, rgba(220, 231, 251, 0) 58%),
    linear-gradient(165deg, var(--bg) 0%, #e4ebf7 100%);
  color: var(--text);
  display: grid;
  place-items: center;
  gap: 0;
  padding: 1.25rem;
  line-height: 1.55;
}

.site-header,
.site-footer,
.guide-page-shell,
.app {
  width: min(1140px, 100%);
}

.app {
  display: grid;
  gap: 1rem;
}

.site-header {
  margin-bottom: 0.95rem;
  border-radius: 16px;
  border: 1px solid #223556;
  background:
    linear-gradient(145deg, rgba(15, 31, 57, 0.98) 0%, rgba(24, 47, 86, 0.98) 100%);
  box-shadow: 0 16px 34px rgba(10, 24, 46, 0.24);
  backdrop-filter: blur(8px);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.8rem 1rem;
}

.site-header-meta {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.header-stat {
  border: 1px solid rgba(248, 250, 252, 0.22);
  background: rgba(248, 250, 252, 0.08);
  color: #e8eef9;
  border-radius: 999px;
  padding: 0.24rem 0.58rem;
  font-size: 0.76rem;
  font-weight: 640;
}

.header-continue {
  font-size: 0.76rem;
  padding: 0.3rem 0.62rem;
}

.site-brand {
  color: var(--on-dark);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-nav-link {
  text-decoration: none;
  color: var(--on-dark);
  border: 1px solid rgba(248, 250, 252, 0.2);
  background: rgba(248, 250, 252, 0.06);
  border-radius: 999px;
  padding: 0.36rem 0.72rem;
  font-size: 0.82rem;
  font-weight: 650;
  transition: transform 140ms ease, border-color 140ms ease, background-color 140ms ease, opacity 140ms ease;
}

.site-nav-link:hover {
  transform: translateY(-1px);
  border-color: rgba(248, 250, 252, 0.4);
  background: rgba(248, 250, 252, 0.12);
  color: #ffffff;
}

.site-nav-link.active {
  color: #13284a;
  border-color: #facc15;
  background: linear-gradient(180deg, #ffe991 0%, #facc15 100%);
}

.site-footer {
  margin-top: 0.95rem;
  border-radius: 14px;
  border: 1px solid var(--border-strong);
  background: linear-gradient(180deg, #ffffff 0%, #f3f8ff 100%);
  box-shadow: var(--card-shadow);
  padding: 0.76rem 0.95rem;
  display: flex;
  justify-content: center;
}

.site-footer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 520;
  text-align: center;
}

.header h1 {
  margin: 0;
  font-size: clamp(1.55rem, 2.3vw, 2rem);
  line-height: 1.2;
}

.header p {
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.study-link-wrap {
  margin-top: 0.95rem;
}

.link-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.58rem;
}

.card,
.status-bar {
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--card-shadow);
}

.card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #ffffff 0%, #f7faff 100%);
  padding: 1.25rem;
  transition: transform 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, rgba(250, 204, 21, 0.95) 0%, rgba(24, 47, 86, 0.58) 100%);
}

.card:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  box-shadow: var(--card-shadow-hover);
}

.card h2 {
  margin: 0 0 0.68rem;
  font-size: 1.12rem;
}

.home-layout,
.topic-layout,
.guide-layout {
  gap: 1rem;
}

.card.home-hero,
.home-hero {
  background: linear-gradient(140deg, #0f1f39 0%, #1b3966 82%);
  border-color: #2c4f86;
  color: var(--on-dark);
}

.card.home-hero:hover,
.home-hero:hover {
  transform: none;
  box-shadow: var(--card-shadow);
}

.card.home-hero h1,
.home-hero h1 {
  margin: 0;
  color: #ffffff;
  font-size: clamp(1.7rem, 2.55vw, 2.2rem);
}

.card.home-hero p,
.home-hero p {
  margin: 0.62rem 0 0;
  color: #dfe8f7;
  max-width: 74ch;
}

.study-link,
button {
  font: inherit;
  border-radius: 12px;
  border: 1px solid transparent;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.64rem 0.98rem;
  font-weight: 670;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 140ms ease, opacity 140ms ease, background-color 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.study-link,
button:not(.option-btn) {
  color: var(--on-dark);
  background: linear-gradient(145deg, var(--navy) 0%, #264575 100%);
  box-shadow: 0 10px 20px rgba(24, 47, 86, 0.22);
}

.study-link:hover,
button:not(.option-btn):hover:not([disabled]) {
  transform: translateY(-1px);
  background: linear-gradient(145deg, var(--navy-soft) 0%, #34568e 100%);
  box-shadow: 0 14px 24px rgba(24, 47, 86, 0.25);
}

.study-link.secondary {
  color: var(--primary);
  border-color: var(--border-strong);
  background: linear-gradient(180deg, #ffffff 0%, #f2f7ff 100%);
  box-shadow: 0 8px 16px rgba(15, 31, 57, 0.08);
}

.study-link.secondary:hover {
  background: #ecf3ff;
  color: #0f1f39;
}

button {
  border: none;
}

button[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

button:focus-visible,
.study-link:focus-visible,
.option-btn:focus-visible,
textarea:focus-visible,
.site-nav-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.home-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.language-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
}

.home-card {
  border-color: var(--border-strong);
}

.home-card-accent {
  position: relative;
  overflow: hidden;
}

.home-card-accent::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent) 0%, #4e7fcb 100%);
}

.home-card:hover {
  box-shadow: 0 20px 34px rgba(15, 31, 57, 0.16);
}

.home-card h2 {
  margin: 0;
  font-size: 1.08rem;
}

.home-card p {
  margin: 0.5rem 0 0.86rem;
  color: var(--muted);
}

.rewards-list {
  margin: 0.2rem 0 0;
  padding-left: 1.05rem;
  display: grid;
  gap: 0.3rem;
}

.rewards-list li {
  color: var(--muted);
  font-weight: 600;
}

.home-progress-grid {
  display: grid;
  gap: 0.68rem;
}

.home-progress-row {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f7faff 100%);
  padding: 0.62rem 0.72rem;
}

.home-progress-row.completed {
  border-color: #86efac;
  background: linear-gradient(180deg, #f0fdf4 0%, #dcfce7 100%);
}

.home-progress-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  margin-bottom: 0.42rem;
}

.home-progress-head strong {
  color: var(--navy);
  font-size: 0.9rem;
}

.module-unlocked-badge {
  display: inline-flex;
  align-items: center;
  margin-left: 0.4rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--accent-soft);
  color: var(--navy);
  padding: 0.12rem 0.5rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.language-complete-badge {
  display: inline-flex;
  align-items: center;
  margin-left: 0.4rem;
  border-radius: 999px;
  border: 1px solid #16a34a;
  background: #16a34a;
  color: #ffffff;
  padding: 0.12rem 0.5rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.home-progress-head span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.home-progress-track {
  width: 100%;
  height: 9px;
  border-radius: 999px;
  border: 1px solid #d5deec;
  background: #eaf0fb;
  overflow: hidden;
}

.home-progress-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #274778 0%, #4e7fcb 100%);
}

.home-progress-fill.completed {
  background: linear-gradient(90deg, #16a34a 0%, #22c55e 100%);
}

.home-reward-line {
  margin-top: 0.45rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 620;
}

.home-progress-actions {
  margin-top: 0.52rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.home-progress-link {
  font-size: 0.8rem;
  padding: 0.42rem 0.72rem;
}

.module-list {
  margin-top: 0.6rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 0.4rem;
}

.module-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  padding: 0.36rem 0.58rem;
  font-size: 0.8rem;
  font-weight: 620;
  text-decoration: none;
}

.module-chip.completed {
  color: var(--navy);
  background: linear-gradient(180deg, #ffffff 0%, #eff5ff 100%);
}

.module-chip.completed:hover {
  background: #e7f0ff;
}

.module-chip.locked {
  color: #7b8aa0;
  background: #edf1f6;
  border-color: #d7dee8;
  cursor: not-allowed;
  pointer-events: none;
}

.language-grid .home-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "title action"
    "desc action";
  align-items: center;
  column-gap: 1rem;
  row-gap: 0.34rem;
  padding: 1.08rem 1.16rem;
}

.language-grid .home-card h2 {
  grid-area: title;
}

.language-grid .home-card p {
  grid-area: desc;
  margin: 0;
  max-width: 70ch;
}

.language-grid .home-card .link-row {
  grid-area: action;
  justify-content: flex-end;
}

.language-grid .home-card .study-link {
  white-space: nowrap;
}

.source-control-card {
  border-color: #8fb3e8;
  background: linear-gradient(180deg, #f6faff 0%, #edf5ff 100%);
}

.source-control-card h2 {
  color: var(--navy);
}

.track-badge {
  display: inline-flex;
  align-items: center;
  margin-left: 0.42rem;
  border-radius: 999px;
  border: 1px solid #9fc2f5;
  background: #dcebff;
  color: #1e4f90;
  padding: 0.14rem 0.52rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.topic-layout .home-hero {
  border-color: #3a5c93;
}

.topic-info-card {
  background: linear-gradient(180deg, #ffffff 0%, #f4f8ff 100%);
}

.topic-info-card h2 {
  color: var(--navy);
  font-size: 1rem;
}

.topic-info-card p {
  margin: 0.52rem 0 0;
  color: var(--muted);
  max-width: 76ch;
}

.topic-industry-list {
  margin: 0.56rem 0 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.3rem;
}

.topic-industry-list li {
  color: var(--muted);
}

.topic-actions-card {
  background: linear-gradient(180deg, #fcfdff 0%, #f1f6ff 100%);
}

.topic-actions-card .link-row {
  margin-top: 0;
  justify-content: flex-end;
  gap: 0.62rem;
}

.topic-action-link {
  min-width: 158px;
  padding: 0.7rem 1.06rem;
  border-radius: 14px;
  font-weight: 700;
}

.topic-action-review {
  border: 1px solid var(--border-strong);
}

.topic-action-test {
  box-shadow: 0 12px 22px rgba(24, 47, 86, 0.23);
}

.topic-back-card .link-row {
  margin-top: 0;
  justify-content: flex-start;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0.72rem;
  margin-top: 0.3rem;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.path-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
}

.topic-btn,
.level-btn,
.path-btn {
  text-align: center;
}

#languageProgressCard p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

#courseRoadmapCard p {
  margin: 0.38rem 0 0;
  color: var(--muted);
}

#courseRoadmapObjective,
#courseRoadmapOutcome {
  font-weight: 530;
}

#badgeProgressText {
  font-weight: 620;
}

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.78rem 0.95rem;
  border-color: #243a60;
  color: var(--on-dark);
  font-weight: 650;
  background: linear-gradient(145deg, var(--primary) 0%, #1a3561 100%);
}

.study-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
  color: var(--muted);
  font-weight: 650;
}

.study-toggle input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}

.study-tip {
  margin-bottom: 0.86rem;
  border: 1px solid #f2d35b;
  border-radius: 10px;
  background: #fffbde;
  color: #1f2f4c;
  padding: 0.62rem 0.74rem;
  font-size: 0.92rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 0.27rem 0.7rem;
  margin-bottom: 0.62rem;
  font-size: 0.77rem;
  font-weight: 650;
}

#questionCard {
  border-color: var(--border-strong);
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-soft) 100%);
}

#questionPrompt {
  margin: 0 0 1rem;
  line-height: 1.55;
  font-size: clamp(1.04rem, 1.8vw, 1.2rem);
  font-weight: 700;
  color: var(--navy);
  padding: 0.78rem 0.88rem;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, var(--surface-soft) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.output-prompt-text {
  display: block;
  margin-bottom: 0.58rem;
  color: var(--navy);
}

.output-code-block {
  margin: 0.1rem 0 0.55rem;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: #0f172a;
  color: #e2e8f0;
  padding: 0.72rem 0.82rem;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

.visual-challenge {
  margin-bottom: 0.74rem;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f6faff 100%);
  padding: 0.68rem 0.8rem;
}

.visual-challenge-title {
  margin: 0 0 0.55rem;
  color: var(--navy);
  font-size: 0.88rem;
  font-weight: 700;
}

.swift-preview-canvas {
  border: 1px dashed var(--border-strong);
  border-radius: 10px;
  background: var(--surface);
  padding: 0.68rem;
}

.swift-preview-row {
  display: flex;
  align-items: center;
  gap: 0.58rem;
}

.swift-preview-column {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.swift-preview-circle {
  width: 42px;
  height: 42px;
  border-radius: 999px;
}

.swift-preview-circle.circle-navy {
  background: var(--navy-soft);
}

.swift-preview-circle.circle-accent {
  background: var(--accent);
}

.swift-preview-title {
  color: var(--navy);
  font-weight: 700;
}

.swift-preview-button {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  color: var(--on-dark);
  background: linear-gradient(145deg, var(--navy) 0%, #234271 100%);
  padding: 0.34rem 0.72rem;
  font-size: 0.84rem;
  font-weight: 620;
}

.option-list {
  display: grid;
  gap: 0.62rem;
}

.blank-answer-wrap {
  display: grid;
  gap: 0.42rem;
}

.blank-answer-label {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 620;
}

.blank-input {
  width: 100%;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%);
  color: #0b1220;
  padding: 0.65rem 0.78rem;
  font: inherit;
}

.blank-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.option-btn,
textarea {
  font: inherit;
}

.option-btn {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%);
  color: #0b1220;
  padding: 0.68rem 0.88rem;
}

.option-btn:hover {
  border-color: #2b4b7f;
  background: #edf4ff;
  color: #0b1220;
  transform: translateY(-1px);
  box-shadow: 0 8px 16px rgba(24, 47, 86, 0.12);
}

.option-btn.selected {
  border-color: #d9a400;
  background: #fff3b0;
  color: #0b1220;
  box-shadow: 0 8px 18px rgba(250, 204, 21, 0.25);
}

.option-btn:focus-visible {
  outline: 3px solid #facc15;
  outline-offset: 2px;
}

textarea {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f6faff 100%);
  padding: 0.72rem;
  line-height: 1.45;
}

.code-editor {
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(180deg, #f8faff 0%, #eef4ff 100%);
}

.code-input {
  border: none;
  border-radius: 0;
  min-height: 180px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.92rem;
}

.swift-editor {
  border-color: #23324d;
  background: #0f172a;
}

.swift-editor .code-input {
  background: #0f172a;
  color: #e2e8f0;
}

.swift-editor .code-input::placeholder {
  color: #94a3b8;
}

.autofill-bar {
  margin-top: 0.54rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.autofill-chip {
  border: 1px solid #f4d85e;
  border-radius: 999px;
  background: linear-gradient(180deg, #fff8c7 0%, #ffef9d 100%);
  color: #243b67;
  padding: 0.34rem 0.6rem;
  font-size: 0.78rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.autofill-chip:hover:not([disabled]) {
  transform: translateY(-1px);
  background: #ffef9d;
}

.actions {
  margin-top: 1.05rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.feedback {
  min-height: 1.35rem;
  margin-top: 0.76rem;
  font-weight: 650;
}

.feedback.correct {
  color: var(--success);
}

.feedback.incorrect {
  color: var(--danger);
}

.feedback-copy {
  display: block;
  margin-bottom: 0.24rem;
}

.feedback-code-grid {
  display: grid;
  gap: 0.58rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 0.46rem;
}

.feedback-code-panel {
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: #0b1324;
  padding: 0.44rem;
}

.feedback-code-title {
  margin: 0 0 0.3rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: #cbd5e1;
}

.feedback-code-block {
  margin: 0;
  border: 1px solid #334155;
  border-radius: 8px;
  background: #0f172a;
  color: #e2e8f0;
  padding: 0.6rem 0.68rem;
  overflow-x: auto;
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.88rem;
  line-height: 1.48;
}

@media (max-width: 860px) {
  .feedback-code-grid {
    grid-template-columns: 1fr;
  }
}

.reward-summary {
  margin-top: 0.45rem;
  border: 1px solid #f2d35b;
  border-radius: 10px;
  background: #fffbde;
  color: #1f2f4c;
  padding: 0.58rem 0.7rem;
  font-weight: 650;
}

.confetti-piece {
  position: fixed;
  top: -12px;
  width: 9px;
  height: 14px;
  border-radius: 3px;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.95;
  animation: confetti-fall 1100ms ease-in forwards;
}

@keyframes confetti-fall {
  0% {
    transform: translate3d(0, -8px, 0) rotate(0deg);
    opacity: 0.95;
  }
  100% {
    transform: translate3d(var(--confetti-x, 0), 105vh, 0) rotate(420deg);
    opacity: 0;
  }
}

#resultsCard button + button {
  margin-left: 0.55rem;
}

.hidden {
  display: none;
}

.guide-page-shell {
  display: grid;
  align-items: start;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 1rem;
}

.guide-page-shell .app {
  width: 100%;
}

.guide-sidebar {
  position: sticky;
  top: 1rem;
  padding: 0.94rem;
  background: linear-gradient(180deg, #ffffff 0%, #f4f8ff 100%);
}

.guide-sidebar h2 {
  margin: 0;
  color: var(--navy);
  font-size: 1rem;
}

.guide-sidebar p {
  margin: 0.42rem 0 0.76rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.guide-sidebar-links {
  display: grid;
  gap: 0.4rem;
}

.sidebar-topic-link {
  text-decoration: none;
  color: var(--navy);
  border: 1px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  padding: 0.4rem 0.56rem;
  font-size: 0.84rem;
  font-weight: 620;
  transition: transform 120ms ease, border-color 120ms ease, background-color 120ms ease;
}

.sidebar-topic-link:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  background: #edf4ff;
  color: #102544;
}

.sidebar-topic-link.active {
  border-color: #facc15;
  color: #1f3359;
  background: #fff9d7;
}

.guide-layout .guide-grid {
  order: 1;
}

.project-ide-lab {
  margin-top: 0.96rem;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: linear-gradient(180deg, #ffffff 0%, #f4f8ff 100%);
  padding: 0.86rem 0.9rem;
}

.guide-readability-controls {
  margin-top: 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: #f7fbff;
  padding: 0.72rem;
  display: grid;
  gap: 0.58rem;
}

.guide-controls-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.guide-controls-row .blank-input {
  min-width: 220px;
}

.guide-readability-status {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.project-ide-lab h2 {
  margin: 0;
  color: var(--navy);
  font-size: 1.12rem;
}

.project-ide-intro {
  margin: 0.38rem 0 0.72rem;
  color: var(--muted);
}

.project-ide-controls {
  display: grid;
  gap: 0.58rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.project-ide-field {
  display: grid;
  gap: 0.35rem;
  color: var(--navy);
  font-weight: 620;
  font-size: 0.92rem;
}

.project-ide-field select,
.project-ide-field input,
.project-ide-field textarea {
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
  padding: 0.52rem 0.6rem;
}

.project-ide-field textarea {
  min-height: 210px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  line-height: 1.45;
}

.project-ide-task-prompt {
  margin: 0.72rem 0;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: #f8fbff;
  color: var(--muted);
  padding: 0.52rem 0.62rem;
}

.project-ide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.64rem;
}

.project-ide-actions .study-link {
  border: 0;
  cursor: pointer;
}

.project-ide-feedback {
  margin-top: 0.72rem;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: #0f172a;
  color: #e2e8f0;
  padding: 0.68rem 0.72rem;
  white-space: pre-wrap;
  line-height: 1.48;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.88rem;
}

.guide-layout .architecture-prep-card {
  order: 2;
}

.guide-layout .interview-prep-card {
  order: 3;
}

.guide-layout #completionPrepCard {
  order: 4;
}

.guide-grid {
  display: grid;
  gap: 1rem;
}

.guide-section,
.interview-prep-card,
.architecture-prep-card {
  border-color: var(--border-strong);
  background: linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%);
}

.guide-section h2,
.interview-prep-card h2,
.architecture-prep-card h2 {
  margin: 0;
  color: var(--navy);
}

.accordion-heading {
  margin: 0;
}

.accordion-toggle {
  width: 100%;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f3f8ff 100%);
  color: var(--navy);
  padding: 0.58rem 0.72rem;
  font: inherit;
  font-size: 1.02rem;
  font-weight: 760;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.accordion-toggle::after {
  content: "▾";
  font-size: 0.86rem;
  color: var(--muted);
}

.is-collapsed .accordion-toggle::after {
  content: "▸";
}

.accordion-content {
  margin-top: 0.58rem;
}

.is-collapsed .accordion-content {
  display: none;
}

.guide-section h3,
.interview-prep-card h3,
.architecture-prep-card h3 {
  margin: 0.96rem 0 0.45rem;
  font-size: 1rem;
  color: var(--primary);
}

.guide-section p,
.guide-section li,
.interview-prep-card p,
.interview-prep-card li,
.architecture-prep-card p,
.architecture-prep-card li {
  color: var(--muted);
  line-height: 1.64;
  max-width: 84ch;
}

.guide-focus-mode .guide-page-shell {
  grid-template-columns: minmax(0, 1fr);
}

.guide-focus-mode .guide-sidebar {
  display: none;
}

.guide-focus-mode .guide-layout .card {
  max-width: 920px;
  margin-inline: auto;
}

.interview-prep-card ul,
.architecture-prep-card ul {
  margin: 0;
  padding-left: 1.08rem;
  display: grid;
  gap: 0.34rem;
}

.general-project-picker {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 0.75rem;
}

.general-project-btn {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%);
  color: var(--navy);
  padding: 0.66rem 0.76rem;
  font: inherit;
  font-weight: 620;
  cursor: pointer;
  display: grid;
  gap: 0.18rem;
}

.general-project-btn-title {
  font-weight: 700;
  color: var(--navy);
}

.general-project-btn-meta {
  font-size: 0.79rem;
  color: var(--muted);
}

.general-project-btn:hover {
  border-color: var(--navy-soft);
  background: #edf4ff;
  transform: translateY(-1px);
}

.general-project-btn.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--primary);
}

.general-project-detail {
  margin-top: 0.82rem;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  padding: 0.78rem 0.86rem;
}

.general-project-detail h3 {
  margin-top: 0.62rem;
}

.general-project-detail h3:first-child {
  margin-top: 0;
}

.general-project-meta {
  margin: 0.2rem 0 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 620;
}

.workshop-card {
  display: grid;
  gap: 0.55rem;
}

.workshop-field {
  display: grid;
  gap: 0.35rem;
  color: var(--navy);
  font-weight: 620;
  font-size: 0.92rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
}

.social-link-icon {
  width: 0.95rem;
  height: 0.95rem;
  flex: 0 0 auto;
}

@media (max-width: 920px) {
  body {
    padding: 1rem;
  }

  .guide-page-shell {
    grid-template-columns: 1fr;
  }

  .site-header-meta {
    justify-content: flex-start;
  }

  .guide-sidebar {
    position: static;
  }

  .language-grid .home-card {
    grid-template-columns: 1fr;
    grid-template-areas:
      "title"
      "desc"
      "action";
    row-gap: 0.52rem;
  }

  .language-grid .home-card .link-row,
  .topic-actions-card .link-row {
    justify-content: flex-start;
  }

  .home-progress-head {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 760px) {
  .site-header,
  .site-footer,
  .guide-page-shell,
  .app {
    width: 100%;
  }

  .site-header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .card {
    padding: 1.06rem;
  }

  .home-grid,
  .topic-grid,
  .level-grid,
  .path-grid {
    grid-template-columns: 1fr;
  }

  .topic-action-link {
    width: 100%;
    min-width: 0;
  }

  .status-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.26rem;
  }

  #resultsCard button {
    width: 100%;
  }

  #resultsCard button + button {
    margin-left: 0;
    margin-top: 0.52rem;
  }
}