:root {
  --bg: #f3f8ff;
  --surface: #ffffff;
  --ink: #1f2937;
  --muted: #475569;
  --brand: #0d9488;
  --brand-2: #2563eb;
  --accent: #ea580c;
  --line: #d4e3f2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top right, #fff7d6 0%, #eef6ff 42%), var(--bg);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1rem;
  padding: 2rem;
  background: linear-gradient(120deg, #14532d 0%, #0f766e 45%, #0c4a6e 100%);
  color: #f8fafc;
}

.hero-content {
  min-width: 0;
}

.landing-hero {
  grid-template-columns: 1fr;
}

.advanced-hero {
  background: linear-gradient(125deg, #312e81 0%, #1e3a8a 50%, #0c4a6e 100%);
}

.interview-hero {
  background: linear-gradient(125deg, #4c0519 0%, #9f1239 35%, #be5b04 68%, #14532d 100%);
}

.planner-hero {
  background: linear-gradient(125deg, #1f2937 0%, #0f766e 38%, #0f766e 58%, #ca8a04 100%);
}

.hero h1 {
  margin: 0.2rem 0 0.6rem;
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
}

.hero p {
  max-width: 72ch;
  line-height: 1.35;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-top: 1rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  opacity: 0.82;
}

.hero-note {
  margin: 0.2rem 0 0;
  color: rgba(248, 250, 252, 0.92);
  line-height: 1.4;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.lang-switch.top-right {
  position: absolute;
  top: 2rem;
  right: 2rem;
  z-index: 5;
}

.lang-btn {
  border: 0;
  border-radius: 999px;
  padding: 0.42rem 0.8rem;
  font: inherit;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #e2e8f0;
  background: transparent;
  cursor: pointer;
}

.lang-btn.active {
  color: #0f172a;
  background: #f8fafc;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.2);
}

.lang-btn:not(.active):hover {
  background: rgba(255, 255, 255, 0.12);
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(130px, 1fr));
  gap: 0.75rem;
  align-content: start;
  padding-top: 5rem;
}

.stat-card {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0.75rem;
  padding: 0.8rem;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  opacity: 0.86;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
}

main {
  padding: 1.5rem;
  display: grid;
  gap: 1rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  padding: 1rem;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.06);
}

.panel h2 {
  margin: 0 0 0.8rem;
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 0.85rem;
}

.compact-cards {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-bottom: 1rem;
}

#cheatsheet.cards {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.two-cols {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

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

.landing-card {
  position: relative;
  min-height: 220px;
  padding-bottom: 5rem;
}

.landing-card p {
  margin-top: 0;
}

.landing-card-action {
  position: absolute;
  right: 0.85rem;
  bottom: 0.85rem;
  margin: 0;
  padding: 0;
}

.landing-card > :last-child {
  margin-bottom: 0;
}

.service-card,
.timeline-item,
.cheat-item,
.question-card {
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  padding: 0.85rem;
}

.roadmap-actions {
  margin-top: 0.65rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
}

.roadmap-actions label {
  font-size: 0.9rem;
  color: #334155;
}

.run-example-btn {
  border: 1px solid transparent;
  color: #ffffff;
  background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 60%, #7c3aed 100%);
  padding: 0.35rem 0.65rem;
  border-radius: 0.45rem;
  font-weight: 600;
  cursor: pointer;
}

.run-example-btn:hover {
  filter: saturate(1.08);
}

.cheat-item {
  border-left: 4px solid #60a5fa;
}

.service-card h3,
.timeline-item h3,
.cheat-item h3 {
  margin: 0 0 0.45rem;
}

.timeline {
  display: grid;
  gap: 0.8rem;
}

pre {
  margin: 0.5rem 0;
  overflow-x: auto;
  background: linear-gradient(110deg, #0b1020 0%, #0b1947 100%);
  color: #e2e8f0;
  border-radius: 0.5rem;
  padding: 0.65rem;
  font-size: 0.82rem;
}

pre code {
  white-space: pre-wrap;
  word-break: break-word;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.5rem;
}

.tag {
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  font-size: 0.74rem;
  border: 1px solid #bfd4ea;
  color: #1e3a5f;
  background: #eff6ff;
}

.tag.category {
  background: #dbeafe;
  border-color: #93c5fd;
  color: #1d4ed8;
}

.level {
  display: inline-block;
  border-radius: 0.3rem;
  padding: 0.16rem 0.4rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  font-weight: 700;
}

.level.basic {
  background: #dcfce7;
  color: #166534;
}

.level.intermediate {
  background: #fef3c7;
  color: #92400e;
}

.level.advanced {
  background: #fee2e2;
  color: #991b1b;
}

.btn {
  display: inline-block;
  text-decoration: none;
  border: 1px solid transparent;
  color: #ffffff;
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 55%, #ea580c 100%);
  padding: 0.45rem 0.75rem;
  border-radius: 0.45rem;
  font-weight: 600;
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.28);
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(124, 58, 237, 0.32);
  filter: saturate(1.08);
}

.secondary-btn {
  background: linear-gradient(135deg, #334155 0%, #475569 100%);
  box-shadow: 0 8px 16px rgba(51, 65, 85, 0.22);
}

.page-note {
  color: var(--muted);
}

.interview-card {
  border-left: 4px solid #fb7185;
}

.planner-card,
.planner-plan {
  border-left: 4px solid #14b8a6;
}

.planner-plan-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
}

.planner-progress-chip {
  min-width: 74px;
  text-align: center;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  background: #ccfbf1;
  color: #115e59;
  font-weight: 700;
}

.planner-weeks {
  display: grid;
  gap: 0.8rem;
  margin-top: 0.8rem;
}

.planner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.6rem 1rem;
}

.planner-subsection {
  margin-top: 0.8rem;
}

.planner-subsection p {
  margin-bottom: 0.4rem;
}

.planner-subsection ul {
  margin: 0.35rem 0 0;
}

.planner-week {
  border: 1px solid #bfdbfe;
  border-radius: 0.75rem;
  background: linear-gradient(180deg, #f8fffe 0%, #f8fbff 100%);
  padding: 0.85rem;
}

.planner-week h4 {
  margin: 0;
}

.planner-task-list {
  display: grid;
  gap: 0.55rem;
}

.planner-task {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  border: 1px solid #dbeafe;
  border-radius: 0.65rem;
  background: #ffffff;
  padding: 0.7rem 0.8rem;
}

.planner-task input {
  margin-top: 0.25rem;
}

.planner-task:has(input:checked) {
  border-color: #99f6e4;
  background: #f0fdfa;
}

.planner-actions {
  margin: 0.9rem 0 0;
}

.compact-card {
  padding-bottom: 1rem;
}

.active-set {
  box-shadow: 0 12px 28px rgba(190, 24, 93, 0.16);
  border-color: #fb7185;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0;
}

.search-bar {
  display: grid;
  gap: 0.5rem;
  margin: 0.9rem 0 0.3rem;
}

.search-input {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 0.7rem;
  padding: 0.8rem 0.95rem;
  font: inherit;
  background: #ffffff;
}

.search-meta {
  color: #64748b;
  font-size: 0.9rem;
}

.source-list {
  display: grid;
  gap: 0.85rem;
}

.source-row {
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  padding: 0.95rem 1rem;
}

.source-row h3 {
  margin: 0 0 0.45rem;
}

.filter-btn {
  border: 1px solid #fda4af;
  background: #fff1f2;
  color: #881337;
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
  font-weight: 600;
}

.filter-btn.active {
  background: linear-gradient(135deg, #e11d48 0%, #fb7185 100%);
  color: #ffffff;
  border-color: transparent;
}

.question-list {
  display: grid;
  gap: 0.9rem;
}

.quiz-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}

.summary-card {
  border: 1px solid #dbe4f0;
  border-radius: 0.75rem;
  background: linear-gradient(180deg, #fff7ed 0%, #ffffff 100%);
  padding: 0.8rem;
}

.summary-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  color: #64748b;
}

.summary-value {
  margin-top: 0.2rem;
  font-size: 1.15rem;
  font-weight: 700;
}

.quiz-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.question-card {
  border-left: 4px solid #f97316;
}

.question-language {
  margin: 0.4rem 0 0.75rem;
  display: grid;
  gap: 0.45rem;
}

.language-row {
  border: 1px solid #e2e8f0;
  border-radius: 0.6rem;
  background: #f8fafc;
  padding: 0.65rem 0.75rem;
}

.language-label {
  display: inline-block;
  margin-right: 0.45rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: #475569;
  font-weight: 700;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin-bottom: 0.7rem;
}

.question-index {
  font-size: 0.8rem;
  color: #475569;
  font-weight: 700;
}

.question-options {
  display: grid;
  gap: 0.45rem;
  margin: 0.8rem 0;
}

.option-item {
  border: 1px solid #fed7aa;
  background: #fff7ed;
  border-radius: 0.6rem;
  padding: 0.7rem 0.85rem;
}

.option-item label {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  cursor: pointer;
}

.option-item input {
  margin-top: 0.15rem;
}

.option-item.correct-option {
  border-color: #86efac;
  background: #f0fdf4;
}

.option-item.wrong-option {
  border-color: #fda4af;
  background: #fff1f2;
}

.reveal-btn {
  margin-top: 0.2rem;
}

.question-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.result-badge {
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.result-badge.pending {
  background: #e2e8f0;
  color: #334155;
}

.result-badge.correct {
  background: #dcfce7;
  color: #166534;
}

.result-badge.wrong {
  background: #fee2e2;
  color: #991b1b;
}

.answer-panel {
  margin-top: 0.85rem;
  border-top: 1px solid #e2e8f0;
  padding-top: 0.85rem;
}

.compare-box {
  border: 1px solid #cbd5e1;
  background: #f8fafc;
  border-radius: 0.6rem;
  padding: 0.75rem;
}

.compare-box ul {
  margin-bottom: 0;
}

.hero .btn {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.45);
  box-shadow: none;
}

.hero .btn:hover {
  box-shadow: none;
}

footer {
  color: var(--muted);
  text-align: center;
  padding: 0.8rem 1rem 1.4rem;
  font-size: 0.85rem;
}

.console-panel {
  margin: 0 1.5rem 1rem;
}

.diagram-card img {
  display: block;
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 0.5rem;
  background: #ffffff;
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-content {
    padding-top: 3.7rem;
  }

  .lang-switch.top-right {
    top: 1rem;
    right: 1rem;
  }

  .stats {
    padding-top: 0;
  }
}

@media (max-width: 1180px) {
  #cheatsheet.cards {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .hero-actions {
    align-items: stretch;
  }

  .lang-switch {
    width: fit-content;
  }

  .hero-content {
    padding-top: 3.9rem;
  }

  .lang-switch.top-right {
    top: 1rem;
    right: 1rem;
  }

  .planner-plan-header {
    flex-direction: column;
  }

  .landing-grid {
    grid-template-columns: 1fr;
  }
}