@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;600&family=Space+Grotesk:wght@400;600;700&family=Source+Serif+4:wght@400;600&display=swap");

:root {
  color-scheme: light;
  --ink: #1b1a16;
  --muted: #5c5347;
  --accent: #0b6e69;
  --accent-strong: #0a5854;
  --accent-2: #d27b2a;
  --paper: #fbf6ed;
  --panel: #ffffff;
  --panel-soft: rgba(255, 255, 255, 0.82);
  --border: rgba(14, 15, 16, 0.12);
  --shadow: 0 24px 48px rgba(14, 17, 16, 0.12);
  --shadow-soft: 0 18px 32px rgba(14, 17, 16, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Serif 4", Georgia, serif;
  color: var(--ink);
  background: linear-gradient(120deg, #f8f3ea 0%, #f0ece2 45%, #e4f0ec 100%);
  min-height: 100%;
}

body::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 60%;
  background:
    radial-gradient(circle at 18% 20%, rgba(11, 110, 105, 0.2), transparent 60%),
    radial-gradient(circle at 80% 0%, rgba(210, 123, 42, 0.2), transparent 55%);
  z-index: -2;
  animation: drift 18s ease-in-out infinite alternate;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background-image: repeating-linear-gradient(
    42deg,
    rgba(20, 20, 20, 0.05),
    rgba(20, 20, 20, 0.05) 1px,
    transparent 1px,
    transparent 16px
  );
  z-index: -1;
  opacity: 0.35;
  pointer-events: none;
}

@keyframes drift {
  0% {
    transform: translate3d(0, 0, 0);
  }
  100% {
    transform: translate3d(0, -24px, 0);
  }
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--accent-strong);
}

.app {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  padding: 28px 22px;
  background: rgba(255, 255, 255, 0.92);
  border-right: 1px solid rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  box-shadow: var(--shadow-soft);
}

.brand {
  margin-bottom: 28px;
}

.brand .eyebrow {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
}

.brand h1 {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  font-size: 1.4rem;
  margin: 6px 0 8px;
}

.brand p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
}

.nav-group {
  display: grid;
  gap: 8px;
}

.nav-group + .nav-group {
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  padding-top: 12px;
}

.nav-title {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  padding: 0 6px;
}

.nav a {
  padding: 10px 14px;
  border-radius: 14px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.nav a:hover {
  color: var(--ink);
  border-color: rgba(11, 110, 105, 0.2);
  background: rgba(11, 110, 105, 0.08);
}

.nav a[aria-current="page"] {
  color: var(--ink);
  background: rgba(11, 110, 105, 0.12);
  border-color: rgba(11, 110, 105, 0.24);
  font-weight: 600;
}

.nav .badge {
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.sidebar-footer {
  margin-top: 32px;
  font-size: 0.85rem;
  color: var(--muted);
}

.content {
  padding: 48px clamp(24px, 6vw, 72px) 72px;
  position: relative;
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(11, 110, 105, 0.12);
  z-index: 3;
}

.progress-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.2s ease;
}

.lesson-hero {
  background: var(--panel-soft);
  border-radius: 28px;
  padding: 40px clamp(24px, 5vw, 52px);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(6px);
}

.lesson-label {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 700;
}

.lesson-hero h2 {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  margin: 8px 0 12px;
  font-size: clamp(2rem, 3.6vw, 3.2rem);
}

.lesson-hero p {
  color: var(--muted);
  margin: 0 0 18px;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 10px;
}

.button-primary,
.button-secondary {
  border-radius: 12px;
  padding: 12px 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  font-weight: 600;
  border: 1px solid transparent;
}

.button-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.button-primary:hover {
  background: var(--accent-strong);
  color: #fff;
}

.button-secondary {
  background: rgba(11, 110, 105, 0.1);
  border-color: rgba(11, 110, 105, 0.25);
  color: var(--ink);
}

.button-secondary:hover {
  background: rgba(11, 110, 105, 0.16);
  color: var(--ink);
}

.meta-card {
  background: var(--panel);
  border-radius: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.meta-card h4 {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  margin: 0 0 6px;
  font-size: 0.95rem;
}

.meta-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.content-section {
  margin-top: 36px;
  padding: 28px clamp(20px, 3vw, 36px);
  background: var(--panel);
  border-radius: 22px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.content-section h3 {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  margin-top: 0;
  font-size: 1.4rem;
}

.content-section h4 {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  margin-bottom: 10px;
  font-size: 1.05rem;
}

.content-section p {
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  background: rgba(11, 110, 105, 0.06);
  border-radius: 16px;
  padding: 16px;
  border: 1px solid rgba(11, 110, 105, 0.14);
}

.card h4 {
  margin-top: 0;
}

.doc-content > :first-child {
  margin-top: 0;
}

.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4 {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  margin-top: 1.5rem;
  margin-bottom: 0.7rem;
}

.doc-content p,
.doc-content li {
  color: var(--muted);
  line-height: 1.7;
}

.doc-content ul,
.doc-content ol {
  padding-left: 1.2rem;
}

.doc-content code {
  background: rgba(11, 110, 105, 0.1);
  border: 1px solid rgba(11, 110, 105, 0.2);
  border-radius: 6px;
  padding: 0 5px;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
}

.doc-content pre {
  background: #13201f;
  color: #f8faf9;
  border-radius: 10px;
  padding: 14px;
  overflow-x: auto;
}

.doc-content pre code {
  background: transparent;
  border: 0;
  padding: 0;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
}

.doc-content th,
.doc-content td {
  border: 1px solid rgba(11, 110, 105, 0.22);
  padding: 8px;
  text-align: left;
  vertical-align: top;
}

.doc-content th {
  background: rgba(11, 110, 105, 0.1);
  color: var(--ink);
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
}

.doc-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.doc-kpi-card {
  border: 1px solid rgba(11, 110, 105, 0.18);
  border-radius: 12px;
  padding: 12px;
  background: rgba(11, 110, 105, 0.06);
}

.doc-kpi-num {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
}

.timeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.timeline-grid > div {
  border: 1px dashed rgba(11, 110, 105, 0.3);
  border-radius: 12px;
  padding: 14px;
  background: rgba(11, 110, 105, 0.04);
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-list h4 {
  margin: 0 0 6px;
}

.faq-list p {
  margin: 0;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.preview-grid figure {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
}

.preview-grid img {
  display: block;
  width: 100%;
  height: 170px;
  object-fit: cover;
}

.preview-grid figcaption {
  padding: 10px 12px;
  font-size: 0.9rem;
  color: var(--muted);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.proof-card {
  border: 1px solid rgba(11, 110, 105, 0.2);
  border-radius: 12px;
  padding: 14px;
  background: rgba(11, 110, 105, 0.05);
}

.proof-card h4 {
  margin: 0 0 8px;
}

.proof-card p {
  margin: 0 0 8px;
}

.callout {
  border-left: 4px solid var(--accent);
  background: rgba(11, 110, 105, 0.08);
  padding: 16px;
  border-radius: 12px;
  color: var(--ink);
}

.checklist,
ul.steps {
  list-style: none;
  padding-left: 0;
  margin: 16px 0 0;
  color: var(--muted);
}

.checklist li,
ul.steps li {
  padding-left: 26px;
  position: relative;
  margin-bottom: 10px;
}

ol.steps {
  padding-left: 22px;
  margin: 16px 0 0;
  color: var(--muted);
}

ol.steps li {
  margin-bottom: 10px;
}

.checklist li::before {
  content: "[ ]";
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-weight: 600;
}

ul.steps li::before {
  content: "-";
  position: absolute;
  left: 8px;
  color: var(--accent);
}

.code-block {
  background: #15130f;
  color: #f5efe2;
  border-radius: 16px;
  padding: 18px;
  margin: 16px 0 0;
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.code-block code {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.95rem;
  white-space: pre-wrap;
  background: transparent;
  padding: 0;
}

code {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.92rem;
  background: rgba(11, 110, 105, 0.12);
  padding: 2px 6px;
  border-radius: 6px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.tag {
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(210, 123, 42, 0.15);
  color: var(--accent-2);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.scorelist {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  color: var(--muted);
}

.scorelist label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  cursor: pointer;
}

.scorelist input[type="checkbox"] {
  accent-color: var(--accent);
  margin-top: 4px;
  width: 16px;
  height: 16px;
}

.scoreboard {
  margin-top: 20px;
  padding: 18px 20px;
  border-radius: 16px;
  border: 1px solid rgba(11, 110, 105, 0.2);
  background: rgba(11, 110, 105, 0.08);
}

.scoreline {
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  font-weight: 600;
  margin: 8px 0 10px;
  color: var(--ink);
}

.score-toggle {
  display: flex;
  gap: 10px;
  align-items: center;
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  font-size: 0.95rem;
  color: var(--ink);
  margin-bottom: 10px;
}

.score-toggle input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

.score-decision {
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
}

.score-note {
  color: var(--muted);
  margin: 0;
  font-size: 0.9rem;
}

.module-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 36px;
}

.module-link {
  flex: 1;
  padding: 16px 20px;
  border-radius: 16px;
  border: 1px solid rgba(11, 110, 105, 0.2);
  background: rgba(11, 110, 105, 0.08);
  font-family: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  text-align: left;
  appearance: none;
  color: var(--ink);
}

.module-link.secondary {
  border-color: rgba(210, 123, 42, 0.3);
  background: rgba(210, 123, 42, 0.12);
}

footer {
  margin-top: 48px;
  color: var(--muted);
  font-size: 0.9rem;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.no-js [data-reveal] {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1024px) {
  .app {
    grid-template-columns: 240px minmax(0, 1fr);
  }
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    border-right: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    display: grid;
    gap: 18px;
  }

  .content {
    padding-top: 24px;
  }

  .module-nav {
    flex-direction: column;
  }

  .cta-row {
    flex-direction: column;
  }
}

@media (max-width: 600px) {
  .lesson-hero {
    padding: 28px 20px;
  }

  .content-section {
    padding: 24px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}