/* mdloop.dev — landing page styles
   Reuses the product's own design tokens (see docs/design-system.md in the mdloop repo). */

:root {
  --chalk: #eceae3;
  --chalk-raised: #fbfaf7;
  --ink: #23211b;
  --ink-soft: #6b675d;
  --lane: #dcd9d0;
  --lane-strong: #c9c5b9;
  --mdloop: #2456e6;
  --mdloop-ink: #1a41b3;
  --signal: #a04d08;
  --resolved: #15803d;
  --danger: #b91c1c;

  --font-display: "Archivo", ui-sans-serif, system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: Charter, "Iowan Old Style", "Sitka Text", Cambria, Georgia, serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shadow-raised: 0 1px 2px rgba(35, 33, 27, 0.06), 0 6px 20px rgba(35, 33, 27, 0.08);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --chalk: #171614;
    --chalk-raised: #201f1b;
    --ink: #ece9e2;
    --ink-soft: #a8a399;
    --lane: #34322c;
    --lane-strong: #4a473e;
    --mdloop: #6690ff;
    --mdloop-ink: #8fabff;
    --shadow-raised: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 24px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --chalk: #171614;
  --chalk-raised: #201f1b;
  --ink: #ece9e2;
  --ink-soft: #a8a399;
  --lane: #34322c;
  --lane-strong: #4a473e;
  --mdloop: #6690ff;
  --mdloop-ink: #8fabff;
  --shadow-raised: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 24px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--chalk);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
}

main {
  overflow-x: hidden;
}

img,
svg {
  max-width: 100%;
}

a {
  color: var(--mdloop);
}

a:hover {
  color: var(--mdloop-ink);
}

:focus-visible {
  outline: 2px solid var(--mdloop);
  outline-offset: 2px;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Nav ---------- */

.site-nav {
  border-bottom: 1px solid var(--lane);
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  padding-bottom: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover {
  color: var(--ink);
}

.brand .mark {
  width: 28px;
  height: 28px;
  flex: none;
}

.mark-dark-svg {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .mark-light-svg {
    display: none;
  }
  :root:not([data-theme="light"]) .mark-dark-svg {
    display: block;
  }
}

:root[data-theme="dark"] .mark-light-svg {
  display: none;
}

:root[data-theme="dark"] .mark-dark-svg {
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
}

.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 6px 2px;
}

.nav-links a:hover {
  color: var(--ink);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 11px 18px;
  min-height: 44px;
  cursor: pointer;
  line-height: 1.2;
}

.btn-primary {
  background: var(--mdloop);
  color: #fff;
  border-color: var(--mdloop);
}

.btn-primary:hover {
  background: var(--mdloop-ink);
  border-color: var(--mdloop-ink);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--lane-strong);
}

.btn-secondary:hover {
  border-color: var(--mdloop);
  color: var(--ink);
}

/* ---------- Section rhythm ---------- */

section {
  padding: 72px 0;
}

section.tight {
  padding: 56px 0;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 16px;
}

h1 {
  font-size: clamp(32px, 5vw, 48px);
}

h2 {
  font-size: clamp(24px, 3.4vw, 32px);
}

h3 {
  font-size: 18px;
  font-weight: 700;
}

.section-head {
  max-width: 640px;
  margin: 0 auto 40px;
  text-align: center;
}

.lede {
  color: var(--ink-soft);
  font-size: 17px;
}

/* ---------- Hero ---------- */

.hero {
  padding-top: 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: start;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.05fr 1fr;
  }
}

.hero-copy p.lede {
  font-size: 18px;
  max-width: 46ch;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin: 28px 0 24px;
}

.npm-link {
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: underline;
}

.code-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--chalk-raised);
  border: 1px solid var(--lane);
  border-radius: 10px;
  box-shadow: var(--shadow-raised);
  padding: 14px 14px 14px 18px;
  max-width: 460px;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink);
  white-space: nowrap;
  overflow-x: auto;
}

.copy-btn {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--lane-strong);
  border-radius: 6px;
  padding: 8px 12px;
  min-height: 36px;
  cursor: pointer;
}

.copy-btn:hover {
  color: var(--ink);
  border-color: var(--mdloop);
}

.copy-btn[data-copied="true"] {
  color: var(--resolved);
  border-color: var(--resolved);
}

/* ---------- Hero review-surface mock ---------- */

.review-mock {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: start;
}

@media (max-width: 480px) {
  .review-mock {
    grid-template-columns: 1fr;
  }
}

.sheet {
  background: var(--chalk-raised);
  border: 1px solid var(--lane);
  border-radius: 10px;
  box-shadow: var(--shadow-raised);
}

.doc-sheet {
  padding: 24px 26px;
}

.mock-header {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--mdloop);
  margin: 0 0 10px;
}

.doc-sheet .doc-filename {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.ext-badge {
  color: var(--mdloop);
  font-weight: 600;
}

.doc-sheet .doc-prose {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
}

.doc-sheet .doc-prose p {
  margin: 0 0 14px;
}

.doc-sheet .doc-prose p:last-child {
  margin-bottom: 0;
}

.doc-sheet mark {
  background: rgba(160, 77, 8, 0.18);
  color: inherit;
  border-bottom: 2px solid var(--signal);
  padding: 0 1px;
}

.comment-card {
  width: 230px;
  padding: 14px;
  font-size: 13px;
  position: relative;
  overflow: hidden;
  /* Same amber as the anchor mark's underline (below) — this rail is what
     reads "this card belongs to that highlighted sentence," not a generic
     floating note. Matches the real app's own left-rail convention for
     tying a row to something it belongs to (docs/design-system.md). */
  border-left: 3px solid var(--signal);
}

@media (max-width: 480px) {
  .comment-card {
    width: 100%;
  }
}

.comment-card .comment-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.comment-card .comment-author {
  font-weight: 600;
  color: var(--ink);
}

.chip {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  border-radius: 999px;
  padding: 3px 9px;
  display: inline-block;
  white-space: nowrap;
}

.chip-open {
  color: var(--signal);
  background: rgba(160, 77, 8, 0.12);
  border: 1px solid rgba(160, 77, 8, 0.35);
}

.chip-resolved {
  color: var(--resolved);
  background: rgba(21, 128, 61, 0.12);
  border: 1px solid rgba(21, 128, 61, 0.35);
}

.comment-card p {
  color: var(--ink-soft);
  margin: 0;
  line-height: 1.5;
}

.comment-card .sweep {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    100deg,
    rgba(21, 128, 61, 0) 0%,
    rgba(21, 128, 61, 0.35) 45%,
    rgba(21, 128, 61, 0) 90%
  );
  transform: translateX(-120%);
}

@media (prefers-reduced-motion: no-preference) {
  .comment-card.play-sweep .sweep {
    animation: sweep-once 1.1s ease-out forwards;
  }
}

@keyframes sweep-once {
  from {
    transform: translateX(-120%);
  }
  to {
    transform: translateX(120%);
  }
}

/* ---------- The loop ---------- */

.loop-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: stretch;
}

@media (min-width: 800px) {
  .loop-row {
    grid-template-columns: 1fr auto 1fr auto 1fr;
  }
}

.loop-step {
  padding: 22px 20px;
  text-align: left;
}

.loop-step .step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mdloop);
  margin: 0 0 8px;
}

.loop-step h3 {
  margin: 0 0 6px;
}

.loop-step p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.loop-arc {
  display: none;
  align-items: center;
  justify-content: center;
}

@media (min-width: 800px) {
  .loop-arc {
    display: flex;
  }
}

.loop-arc svg {
  width: 40px;
  height: 24px;
}

/* ---------- What you get ---------- */

.facts-list {
  max-width: 760px;
  margin: 0 auto;
}

.fact-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--lane);
}

.fact-row:last-child {
  border-bottom: 1px solid var(--lane);
}

@media (max-width: 640px) {
  .fact-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

.fact-row .eyebrow {
  margin: 0;
}

.fact-row p {
  margin: 0;
  color: var(--ink);
}

/* ---------- Two ways to run ---------- */

.run-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 760px) {
  .run-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.run-card {
  padding: 28px;
}

.run-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.run-card p {
  color: var(--ink-soft);
  margin: 0 0 12px;
}

.run-card ul {
  margin: 0 0 16px;
  padding-left: 20px;
  color: var(--ink-soft);
}

.run-card li {
  margin-bottom: 6px;
}

.run-card code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--chalk);
  border: 1px solid var(--lane);
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--ink);
}

.run-card .btn {
  margin-top: 4px;
}

/* ---------- Connect your agent (tabs) ---------- */

.tabs {
  max-width: 760px;
  margin: 0 auto;
}

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--lane);
  margin-bottom: 20px;
}

.tab {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--ink-soft);
  padding: 10px 14px;
  min-height: 44px;
  cursor: pointer;
}

.tab:hover {
  color: var(--ink);
}

.tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--mdloop);
}

.tabpanel {
  padding: 4px 0;
}

.tabpanel[hidden] {
  display: none;
}

.tabpanel pre {
  background: var(--chalk-raised);
  border: 1px solid var(--lane);
  border-radius: 10px;
  box-shadow: var(--shadow-raised);
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  margin: 0 0 14px;
}

.tabpanel p {
  color: var(--ink-soft);
}

.tools-details {
  margin-top: 32px;
  border-top: 1px solid var(--lane);
  padding-top: 20px;
}

.tools-details summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  font-weight: 500;
  padding: 8px 0;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.tools-table-wrap {
  overflow-x: auto;
  margin-top: 12px;
}

table.tools-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
}

table.tools-table th,
table.tools-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--lane);
  vertical-align: top;
}

table.tools-table th {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
  font-weight: 500;
}

table.tools-table td code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
}

/* ---------- Open source ---------- */

.oss-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 16px;
}

.oss-links a {
  font-weight: 600;
  text-decoration: none;
}

.oss-links a:hover {
  text-decoration: underline;
}

.docs-note {
  margin-top: 16px;
  color: var(--ink-soft);
}

.docs-note a {
  color: var(--ink-soft);
  text-decoration: underline;
}

/* ---------- FAQ ---------- */

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  padding: 20px 0;
  border-top: 1px solid var(--lane);
}

.faq-list .faq-item:last-child {
  border-bottom: 1px solid var(--lane);
}

.faq-item h3 {
  margin-bottom: 8px;
}

.faq-item p {
  margin: 0;
  color: var(--ink-soft);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--lane);
  padding: 40px 0;
}

.footer-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-top .mark {
  width: 22px;
  height: 22px;
}

.footer-top span {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
}

.site-footer p {
  color: var(--ink-soft);
  font-size: 14px;
  max-width: 640px;
  margin: 0 0 10px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 14px 0;
  font-size: 14px;
}

/* ---------- Touch targets ---------- */

@media (pointer: coarse) {
  .btn,
  .copy-btn,
  .tab,
  .nav-links a,
  .footer-links a {
    min-height: 44px;
  }
}