/* Hero */
.hero {
  padding-block: var(--section-padding);
  border-bottom: 1px solid var(--color-border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.hero-content {
  max-width: 36rem;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.hero h1 {
  margin-bottom: 1.25rem;
}

.hero h1 em {
  font-style: normal;
  color: var(--color-accent);
}

.hero-lead {
  font-size: var(--text-lg);
  margin-bottom: 2rem;
  max-width: 32rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 6rem;
}

.hero-stat__icon {
  width: 1rem;
  height: 1rem;
  color: var(--color-accent);
  margin-bottom: 0.15rem;
  opacity: 0.85;
}

.hero-stat__icon svg {
  width: 100%;
  height: 100%;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.hero-stat__value,
.hero-stat strong {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: 1.2;
}

.hero-stat__label,
.hero-stat span {
  font-size: var(--text-xs);
  line-height: 1.4;
  color: var(--color-text-muted);
  letter-spacing: 0.01em;
}

/* Hero visual slot (ui-mockup primary) */
.hero-visual {
  min-width: 0;
}

.hero-visual .ui-mockup {
  transition: box-shadow var(--duration-normal) var(--ease-out);
}

.hero-visual .ui-mockup:hover {
  box-shadow: var(--shadow-panel-hover);
}

/* Protocol diagram — secondary / optional */
.protocol-panel {
  border: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
  box-shadow: var(--shadow-panel);
  position: relative;
  overflow: hidden;
}

.protocol-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: relative;
}

.protocol-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.protocol-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-status-green);
}

.protocol-body {
  padding: 1.5rem;
  position: relative;
}

.protocol-flow {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.protocol-node {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.75rem;
}

.protocol-box {
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  padding: 0.875rem 1rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.protocol-box-label {
  color: var(--color-text-faint);
  margin-bottom: 0.25rem;
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.protocol-box-name {
  color: var(--color-text);
  font-weight: 500;
}

.protocol-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  min-width: 5rem;
}

.protocol-arrow-line {
  width: 100%;
  height: 1px;
  background: var(--color-border-strong);
  position: relative;
}

.protocol-arrow-line::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  border: 4px solid transparent;
  border-left-color: var(--color-border-strong);
}

.protocol-arrow-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-text-faint);
  white-space: nowrap;
}

.protocol-arrow-label.is-active {
  color: var(--color-accent);
}

.protocol-packet {
  display: none;
}

.protocol-log {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.8;
  color: var(--color-text-faint);
  min-height: 4.5rem;
}

.protocol-log .log-line {
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity 0.4s var(--ease-out),
    transform 0.4s var(--ease-out);
}

.protocol-log .log-line.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.protocol-log .log-accent {
  color: var(--color-accent);
}

.protocol-log .log-dim {
  color: var(--color-text-faint);
}

/* Architecture section */
.architecture {
  padding-block: var(--section-padding);
  background: var(--color-bg);
}

.architecture-grid {
  margin-top: 3rem;
}

.architecture-aside {
  padding: 2rem;
  background: var(--color-accent-subtle);
  border-left: 3px solid var(--color-accent);
}

.architecture-aside h3 {
  margin-bottom: 0.75rem;
  font-size: var(--text-lg);
}

.architecture-aside p {
  font-size: var(--text-sm);
  margin-bottom: 1rem;
}

.architecture-aside ul {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.architecture-aside li {
  padding: 0.35rem 0;
  padding-left: 1rem;
  position: relative;
}

.architecture-aside li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

/* Features */
.features {
  padding-block: var(--section-padding);
  background: var(--color-bg-subtle);
  border-block: 1px solid var(--color-border);
}

.features-list {
  margin-top: 2.5rem;
}

.features-list.features-grid {
  margin-top: 2.5rem;
}

/* Quick start */
.quickstart {
  padding-block: var(--section-padding);
}

.quickstart-grid {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.quickstart-steps {
  counter-reset: step;
}

.quickstart-step {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  padding-bottom: 1.75rem;
  position: relative;
}

.quickstart-step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 1.15rem;
  top: 2.5rem;
  bottom: 0;
  width: 1px;
  background: var(--color-border);
}

.quickstart-step::before {
  counter-increment: step;
  content: counter(step);
  width: 2.3rem;
  height: 2.3rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg);
  color: var(--color-text);
}

.quickstart-step h3 {
  margin-bottom: 0.35rem;
  font-size: var(--text-base);
}

.quickstart-step p {
  font-size: var(--text-sm);
}

/* Requirements */
.requirements {
  padding-block: var(--section-padding);
  background: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
}

.requirements-table-wrap {
  margin-top: 2rem;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.requirements-table-wrap .compat-table {
  border: none;
}

.requirements-table-wrap .compat-table--zebra tbody tr:nth-child(even) td {
  background: var(--color-bg-subtle);
}

/* CTA */
.cta {
  padding-block: var(--section-padding);
  border-top: 1px solid var(--color-border);
}

.cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2.5rem;
  border: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
  box-shadow: var(--shadow-panel);
}

.cta-copy h2 {
  margin-bottom: 0.5rem;
}

.cta-copy p {
  font-size: var(--text-sm);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.6s var(--ease-out),
    transform 0.6s var(--ease-out);
}

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

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

  .ui-mockup__body {
    min-height: 14rem;
  }

  .ui-mockup__sidebar {
    width: 2.25rem;
  }

  .protocol-node {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .protocol-arrow {
    transform: rotate(90deg);
    min-width: auto;
    padding: 0.5rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .hero-visual .ui-mockup {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }

  .protocol-log .log-line {
    opacity: 1 !important;
    transform: none !important;
  }
}