/* marketing.css — Phase 70 public marketing pages.
   Builds on variables.css design tokens (academic palette, calm type).
   Vanilla CSS, no framework. Dark-mode via [data-theme="dark"] (set by a
   tiny inline prefers-color-scheme script on each page). */

:root {
  --mk-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  --mk-hero: clamp(2rem, 5vw, 3.25rem);
  --mk-h2: clamp(1.5rem, 3vw, 2.1rem);
  --mk-maxw: 1080px;
}

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

html {
  scroll-behavior: smooth;
}

body.mk {
  margin: 0;
  font-family: var(--mk-font);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* Link decoration only. Color comes from reset.css `a { color: accent }`
   (specificity 0,0,1), so every component's single-class color rule (buttons,
   chips, nav, cards) wins with no :not()/specificity gymnastics. marketing.css
   is loaded only by the marketing pages, so a bare `a` selector is safe. */
a {
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.mk-skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 100;
}
.mk-skip:focus {
  left: var(--space-3);
  top: var(--space-3);
}

.mk-wrap {
  max-width: var(--mk-maxw);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ---- header / nav ---- */
.mk-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.mk-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-6);
  max-width: var(--mk-maxw);
  margin: 0 auto;
  /* Anchor the mobile dropdown menu (position:absolute; top:100%) to the nav
     bar itself; without this it resolves against the viewport and drops
     off-screen, so tapping the hamburger appeared to do nothing. */
  position: relative;
}
.mk-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--font-size-xl);
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.mk-brand:hover {
  text-decoration: none;
}
.mk-brand .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}
.mk-nav-spacer {
  flex: 1;
}
.mk-nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.mk-nav-links a:not(.mk-btn) {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
}
.mk-nav-links a:not(.mk-btn):hover {
  color: var(--color-text);
}
.mk-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 18px;
  line-height: 1;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
}

/* ---- buttons ---- */
.mk-btn {
  display: inline-block;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-lg);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s ease, transform 0.05s ease;
}
.mk-btn:hover {
  text-decoration: none;
}
.mk-btn:active {
  transform: translateY(1px);
}
.mk-btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.mk-btn-primary:hover {
  background: var(--color-accent-hover);
}
.mk-btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.mk-btn-ghost:hover {
  background: var(--color-surface-alt);
}
/* The in-nav CTA is normalized to the smaller in-app button (.btn-sm:
   space-1/space-3 padding, font-size-sm) so the header bar is the same height
   and weight across the marketing pages and the SPA auth pages (login/register,
   web/js/components/public-nav.js). The larger .mk-btn size still applies to
   hero / pricing CTAs. */
.mk-nav .mk-btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-sm);
}

/* ---- hero ---- */
.mk-hero {
  padding: clamp(var(--space-12), 9vw, 96px) 0 var(--space-12);
  text-align: center;
}
.mk-eyebrow {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  margin-bottom: var(--space-5);
}
.mk-hero h1 {
  font-size: var(--mk-hero);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
  margin: 0 auto var(--space-5);
  max-width: 16ch;
}
.mk-hero p.lead {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin: 0 auto var(--space-8);
}
.mk-cta-row {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- sections ---- */
.mk-section {
  padding: var(--space-12) 0;
}
.mk-section.alt {
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.mk-section h2 {
  font-size: var(--mk-h2);
  line-height: var(--line-height-tight);
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-3);
}
.mk-section .section-intro {
  color: var(--color-text-muted);
  max-width: 62ch;
  margin: 0 0 var(--space-8);
}
.mk-center {
  text-align: center;
}
.mk-center .section-intro {
  margin-left: auto;
  margin-right: auto;
}

/* ---- card grid ---- */
.mk-grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.mk-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.mk-card h3 {
  margin: var(--space-3) 0 var(--space-2);
  font-size: var(--font-size-xl);
}
.mk-card p {
  margin: 0;
  color: var(--color-text-muted);
}
.mk-icon {
  width: 32px;
  height: 32px;
  color: var(--color-accent);
}

/* ---- steps ---- */
.mk-steps {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.mk-step {
  position: relative;
  padding-top: calc(var(--space-8) + 8px);
}
/* A line-icon badge replaces the old numbered circle — softer, on-brand,
   and per-step meaningful. The accent tint + rounded square reads as a
   product chip rather than a step counter. */
.mk-step-icon {
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--color-accent-soft, rgba(31, 82, 128, 0.12));
  color: var(--color-accent);
}
.mk-step-icon svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.mk-step h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--font-size-lg);
}
.mk-step p {
  margin: 0;
  color: var(--color-text-muted);
}

/* ---- feature rows (features page) ---- */
.mk-feature {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-4);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-border);
}
.mk-feature:last-child {
  border-bottom: none;
}
.mk-feature .mk-icon {
  width: 40px;
  height: 40px;
}
.mk-feature h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--font-size-xl);
}
.mk-feature p {
  margin: 0;
  color: var(--color-text-muted);
  max-width: 70ch;
}

/* ---- pricing ---- */
.mk-prices {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  align-items: start;
}
.mk-price {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.mk-price.featured {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}
.mk-price .tier {
  font-weight: 700;
  font-size: var(--font-size-xl);
}
.mk-price .amount {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.1;
}
.mk-price .amount small {
  font-size: var(--font-size-body);
  font-weight: 500;
  color: var(--color-text-muted);
}
.mk-price ul {
  list-style: none;
  padding: 0;
  margin: var(--space-2) 0;
  display: grid;
  gap: var(--space-2);
}
.mk-price li {
  position: relative;
  padding-left: var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--font-size-body);
}
.mk-price li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}
.mk-badge {
  align-self: flex-start;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 999px;
  padding: 2px var(--space-3);
}

/* ---- FAQ ---- */
.mk-faq details {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) 0;
}
.mk-faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: var(--font-size-lg);
}
.mk-faq p {
  margin: var(--space-3) 0 0;
  color: var(--color-text-muted);
}

/* ---- CTA band ---- */
.mk-cta-band {
  text-align: center;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-12) var(--space-6);
  margin: var(--space-12) 0;
}
.mk-cta-band h2 {
  margin: 0 0 var(--space-3);
  font-size: var(--mk-h2);
}
.mk-cta-band p {
  margin: 0 0 var(--space-6);
  opacity: 0.92;
}
.mk-cta-band .mk-btn-primary {
  background: #fff;
  color: var(--color-accent);
}
.mk-cta-band .mk-btn-primary:hover {
  background: var(--color-accent-soft);
}

/* ---- footer ---- */
.mk-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  padding: var(--space-10) 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-body);
}
.mk-footer .cols {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  justify-content: space-between;
}
.mk-footer a {
  color: var(--color-text-muted);
}
.mk-footer a:hover {
  color: var(--color-text);
}
.mk-footer .legal {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ---- responsive ---- */
@media (max-width: 720px) {
  .mk-nav-toggle {
    display: inline-block;
  }
  .mk-nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-6);
    /* Sit above page content + cast a small shadow so the open menu reads as
       a layer, not as inline content pushing the page down. */
    z-index: 60;
    box-shadow: var(--shadow-lg);
  }
  .mk-nav-links.open {
    display: flex;
  }
  .mk-nav-links a,
  .mk-nav-links .mk-btn {
    padding: var(--space-3) 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .mk-btn {
    transition: none;
  }
}

/* ---- card with hover/focus jump-menu (home → methods) ---- */
.mk-card-menu {
  position: relative;
  padding: 0;
}
.mk-card-menu .mk-card-link {
  display: block;
  padding: var(--space-6);
  color: inherit;
  border-radius: var(--radius-lg);
}
.mk-card-menu .mk-card-link:hover {
  text-decoration: none;
}
.mk-card-menu h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--font-size-xl);
}
.mk-card-menu p {
  margin: 0;
  color: var(--color-text-muted);
}
.mk-card-cta {
  display: inline-block;
  margin-top: var(--space-3);
  color: var(--color-accent);
  font-weight: 600;
  font-size: var(--font-size-body);
}
.mk-card-menu:hover,
.mk-card-menu:focus-within {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  z-index: 5;
}
.mk-card-pop {
  position: absolute;
  top: calc(100% - var(--space-3));
  left: var(--space-4);
  right: var(--space-4);
  margin: 0;
  padding: var(--space-2);
  list-style: none;
  background: var(--color-surface);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 20;
  display: grid;
  gap: 2px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.14s ease, transform 0.14s ease, visibility 0.14s;
}
.mk-card-menu:hover .mk-card-pop,
.mk-card-menu:focus-within .mk-card-pop {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.mk-pop-head {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.mk-pop-link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: var(--font-size-body);
}
.mk-pop-link:hover,
.mk-pop-link:focus {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  text-decoration: none;
}
.mk-pop-link small {
  color: var(--color-text-muted);
}
@media (prefers-reduced-motion: reduce) {
  .mk-card-pop {
    transition: none;
  }
}

/* ---- quick-jump chips (methods page) ---- */
.mk-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}
.mk-chip {
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: 999px;
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-body);
}
.mk-chip:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* ---- methodology sections (methods page) ---- */
.mk-method {
  scroll-margin-top: 84px; /* clear the sticky header on anchor jump */
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border);
}
.mk-method:last-of-type {
  border-bottom: none;
}
.mk-method-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.mk-method-head h2 {
  margin: 0;
  font-size: var(--mk-h2);
}
.mk-attr {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 2px var(--space-3);
  white-space: nowrap;
}
/* When the attribution is a link to the method's paper. */
a.mk-attr:hover,
a.mk-attr:focus {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  text-decoration: none;
}
.mk-method-lead {
  color: var(--color-text-muted);
  max-width: 72ch;
  margin: var(--space-3) 0 var(--space-5);
}
.mk-method-cols {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: var(--space-6);
  align-items: start;
}
.mk-method-cols h3 {
  font-size: var(--font-size-lg);
  margin: 0 0 var(--space-2);
}
.mk-method-cols p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-muted);
}
.mk-phases {
  counter-reset: ph;
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-2);
}
.mk-phases li {
  position: relative;
  padding-left: var(--space-8);
  color: var(--color-text);
}
.mk-phases li::before {
  counter-increment: ph;
  content: counter(ph);
  position: absolute;
  left: 0;
  top: 0;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: var(--font-size-sm);
  font-weight: 700;
}
.mk-backtop {
  display: inline-block;
  margin-top: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}
@media (max-width: 720px) {
  .mk-method-cols {
    grid-template-columns: 1fr;
  }
}

/* Phase 81 — pricing add-on / term tables */
.mk-table { width: 100%; border-collapse: collapse; margin: var(--space-3) 0; font-size: 0.95rem; }
.mk-table caption { margin-bottom: var(--space-2); font-weight: 600; }
.mk-table th, .mk-table td { padding: var(--space-2) var(--space-3); text-align: left; border-bottom: 1px solid var(--color-border, #e7ebf0); }
.mk-table thead th { font-weight: 700; }
.mk-table tbody th { font-weight: 500; }
.mk-table td { text-align: right; }

/* ---- Video walkthrough (home) ---- */
.mk-video {
  max-width: 920px;
  margin: 0 auto;
}
.mk-video-el {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  border-radius: var(--radius-md, 10px);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  background: #0b0f14;
}
.mk-video-cap {
  margin: var(--space-3) 0 0;
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}