/* Dkompos homepage — graphite, precise, app-true.
   One accent, hairline structure, mono telemetry. */

.home-essential {
  --essential-ink: #0a0a0b;
  --essential-panel: #121316;
  --essential-panel-up: #17181c;
  --essential-rule: rgba(245, 245, 244, 0.08);
  --essential-rule-mid: rgba(245, 245, 244, 0.14);

  background: var(--essential-ink);
}

.essential-home h1,
.essential-home h2,
.essential-home h3 {
  letter-spacing: -0.025em;
}

/* Meta lines — mono telemetry, like the app */

.essential-meta,
.essential-download-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  line-height: 1.5;
  text-transform: uppercase;
}

/* Hero — centered statement with the product visible in the first viewport */

.essential-hero {
  position: relative;
  display: grid;
  justify-items: center;
  gap: clamp(32px, 3vw, 40px);
  margin-top: var(--header-height);
  padding: clamp(44px, 4vw, 56px) var(--content-gutter) 0;
  overflow: hidden;
  text-align: center;
}

.essential-hero-copy {
  position: relative;
  max-width: 720px;
  display: grid;
  justify-items: center;
}

.essential-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 4.8vw, 64px);
  font-weight: 600;
  line-height: 1.02;
  text-wrap: balance;
}

.essential-lede {
  max-width: 520px;
  margin-top: 16px;
  color: var(--text-soft);
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.6;
}

.essential-hero .button {
  margin-top: 24px;
}

.essential-meta {
  margin-top: 14px;
  color: var(--muted);
}

.essential-hero-product {
  position: relative;
  width: min(100%, 1080px);
  border-radius: var(--radius) var(--radius) 0 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 0;
  overflow: hidden;
  background: var(--essential-panel);
  box-shadow: none;
}

.essential-hero-product img {
  width: 100%;
  height: auto;
  display: block;
}

/* Principles — one hairline band, three quiet columns */

.essential-principles {
  padding: clamp(72px, 9vw, 120px) var(--content-gutter);
  border-top: 1px solid var(--essential-rule);
  background: var(--essential-ink);
}

.essential-principles-heading {
  max-width: 560px;
}

.essential-principles h2,
.essential-library h2,
.essential-audio h2,
.essential-faq h2,
.essential-download h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 600;
  line-height: 1.08;
  text-wrap: balance;
}

.essential-principles-heading p {
  max-width: 440px;
  margin-top: 16px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}

.essential-principle-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(44px, 5vw, 64px);
}

.essential-principle-list article {
  padding-top: 22px;
  border-top: 1px solid var(--essential-rule-mid);
}

.essential-principle-list h3 {
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
}

.essential-principle-list p {
  margin-top: 10px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.6;
}

/* Library — product left, copy right */

.essential-library {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  gap: clamp(48px, 6vw, 88px);
  align-items: center;
  padding: clamp(72px, 9vw, 120px) var(--content-gutter);
  border-top: 1px solid var(--essential-rule);
  background: var(--essential-ink);
}

.essential-library figure {
  min-width: 0;
  margin: 0;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  background: var(--essential-panel);
  box-shadow: none;
}

.essential-library figure img {
  width: 100%;
  height: auto;
  display: block;
}

.essential-library-copy > p {
  margin-top: 18px;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.7;
}

.essential-library-copy .text-link {
  margin-top: 22px;
}

/* Audio — copy beside a signal-path readout */

.essential-audio {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(340px, 1.1fr);
  gap: clamp(48px, 7vw, 110px);
  align-items: center;
  padding: clamp(72px, 9vw, 120px) var(--content-gutter);
  border-top: 1px solid var(--essential-rule);
  background: var(--essential-ink);
}

.essential-audio-copy {
  max-width: 480px;
}

.essential-audio-copy > p {
  margin-top: 18px;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.7;
}

.essential-audio-copy .text-link {
  margin-top: 22px;
}

.essential-route-panel {
  max-width: 520px;
  justify-self: end;
  width: 100%;
  padding: 8px 24px;
  border: 1px solid var(--essential-rule-mid);
  border-radius: var(--radius);
  background: var(--essential-panel);
  box-shadow: none;
}

.essential-route-title {
  padding: 16px 0 14px;
  border-bottom: 1px solid var(--essential-rule);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.essential-route > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0;
  border-bottom: 1px solid var(--essential-rule);
}

.essential-route > div:last-child {
  border-bottom: 0;
}

.essential-route dt {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.essential-route dd {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
}

/* Signal-path verification — the panel confirms its route once, on first
   view, the way the app earns the badge. JS sets data-reveal only when
   motion is allowed; without it the panel is simply static and complete. */

@media (prefers-reduced-motion: no-preference) {
  .essential-route-panel[data-reveal] .essential-route > div {
    opacity: 0;
    transform: translateY(8px);
    transition:
      opacity 480ms var(--ease),
      transform 480ms var(--ease);
  }

  .essential-route-panel[data-reveal] .essential-route > div:nth-child(2) {
    transition-delay: 110ms;
  }

  .essential-route-panel[data-reveal] .essential-route > div:nth-child(3) {
    transition-delay: 220ms;
  }

  .essential-route-panel[data-reveal] .essential-route > div:nth-child(4) {
    transition-delay: 330ms;
  }

  .essential-route-panel[data-reveal] .essential-route-title {
    color: var(--faint);
    transition: color 420ms var(--ease) 640ms;
  }

  .essential-route-panel[data-reveal].is-live .essential-route > div {
    opacity: 1;
    transform: none;
  }

  .essential-route-panel[data-reveal].is-live .essential-route-title {
    color: var(--accent);
  }
}

/* FAQ */

.essential-faq {
  display: grid;
  grid-template-columns: minmax(240px, 0.7fr) minmax(400px, 1.3fr);
  gap: clamp(48px, 7vw, 110px);
  padding: clamp(72px, 9vw, 120px) var(--content-gutter);
  border-top: 1px solid var(--essential-rule);
  background: var(--essential-ink);
}

.essential-faq-list {
  border-top: 1px solid var(--essential-rule-mid);
}

.essential-faq-list details {
  border-bottom: 1px solid var(--essential-rule-mid);
}

.essential-faq-list summary {
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  transition: color var(--quick) var(--ease);
}

.essential-faq-list summary::-webkit-details-marker {
  display: none;
}

.essential-faq-list summary::after {
  content: "";
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  background:
    linear-gradient(currentColor, currentColor) center / 11px 1px no-repeat,
    linear-gradient(currentColor, currentColor) center / 1px 11px no-repeat;
  color: var(--faint);
  transition:
    transform var(--steady) var(--ease),
    color var(--quick) var(--ease);
}

.essential-faq-list summary:hover::after {
  color: var(--text-soft);
}

.essential-faq-list details[open] summary::after {
  transform: rotate(45deg);
  color: var(--accent);
}

.essential-faq-list details p {
  max-width: 620px;
  padding: 0 0 22px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

/* Download — centered close */

.essential-download {
  display: grid;
  justify-items: center;
  padding: clamp(88px, 11vw, 150px) var(--content-gutter);
  border-top: 1px solid var(--essential-rule);
  background: var(--essential-ink);
  text-align: center;
}

.essential-download > p:first-of-type {
  max-width: 420px;
  margin-top: 16px;
  color: var(--text-soft);
  font-size: 16px;
}

.essential-download .button {
  margin-top: 30px;
}

.essential-download-meta {
  margin-top: 18px;
  color: var(--muted);
}

/* Responsive */

@media (max-width: 980px) {
  .essential-library,
  .essential-audio {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .essential-library figure {
    order: 2;
  }

  .essential-library-copy {
    order: 1;
    max-width: 620px;
  }

  .essential-route-panel {
    justify-self: start;
  }

  .essential-faq {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 760px) {
  .essential-hero {
    gap: 34px;
    padding-top: 48px;
  }

  .essential-hero h1 {
    font-size: clamp(36px, 10vw, 46px);
  }

  .essential-lede {
    font-size: 16px;
  }

  .essential-principle-list {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .essential-principles,
  .essential-library,
  .essential-audio,
  .essential-faq,
  .essential-download {
    padding-right: var(--gutter);
    padding-left: var(--gutter);
  }
}

@media (max-width: 420px) {
  .essential-hero .button,
  .essential-download .button {
    width: 100%;
  }

  .essential-route-panel {
    padding: 4px 18px;
  }

  .essential-route > div {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}