/* Blueprint — platform landing (see /design.md) */
@import url("blueprint.css");

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.58;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Accessibility */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 200;
  padding: 0.75rem 1rem;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
  left: 0;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(16, 42, 67, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-links {
  display: flex;
  gap: 1.75rem;
}

.nav-links a {
  font-family: var(--font-body);
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 150ms ease-out;
}

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

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 400ms cubic-bezier(0.16, 1, 0.3, 1), transform 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Hero */
.hero {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  background: var(--color-surface-muted);
  border: 1px dashed var(--border-dashed);
  border-radius: 0;
  font-family: var(--font-meta);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-meta);
  margin-bottom: 1.5rem;
  animation: heroIn 400ms ease both;
}

.pulse {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

@keyframes heroIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

.hero h1 {
  max-width: 18ch;
  font-family: var(--font-title);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--color-title);
  margin-bottom: 1.25rem;
  animation: heroIn 400ms ease 0.06s both;
}

.hero-accent {
  color: var(--color-heading);
}

.hero-lead {
  max-width: 42rem;
  margin: 0 0 2rem;
  font-size: 1.0625rem;
  color: var(--color-muted);
  line-height: 1.65;
  animation: heroIn 400ms ease 0.12s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.75rem;
  animation: heroIn 400ms ease 0.18s both;
}

.hero-note {
  font-family: var(--font-meta);
  font-size: 0.8125rem;
  color: var(--color-meta);
  opacity: 0.85;
  margin-bottom: 3rem;
  animation: heroIn 400ms ease 0.24s both;
}

.hero-note code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-link);
}

/* Browser mock */
.hero-visual {
  position: relative;
  max-width: 900px;
}

.browser-frame {
  position: relative;
  z-index: 2;
  background: var(--color-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.browser-chrome {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  background: rgba(12, 36, 58, 0.95);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
}

.browser-chrome span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
}

.browser-chrome span:nth-child(1) { border-color: rgba(248, 113, 113, 0.6); }
.browser-chrome span:nth-child(2) { border-color: rgba(251, 191, 36, 0.6); }
.browser-chrome span:nth-child(3) { border-color: rgba(74, 222, 128, 0.6); }

.url-bar {
  flex: 1;
  margin-left: 0.75rem;
  padding: 0.375rem 0.75rem;
  background: var(--color-surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-meta);
  text-align: left;
}

.browser-content {
  display: grid;
  grid-template-columns: 140px 1fr 1fr;
  min-height: 240px;
  background:
    linear-gradient(var(--grid-line-fine) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-fine) 1px, transparent 1px),
    var(--color-surface);
  background-size: 12px 12px, 12px 12px, auto;
}

.mock-panel {
  padding: 1rem;
  border-right: 1px solid var(--border);
  text-align: left;
}

.mock-panel:last-child {
  border-right: none;
}

.mock-label {
  font-family: var(--font-meta);
  font-size: 0.62rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.mock-tree code {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-muted);
  line-height: 1.8;
}

.mock-bubble {
  padding: 0.5rem 0.625rem;
  border-radius: var(--radius);
  font-size: 0.6875rem;
  margin-bottom: 0.5rem;
  max-width: 90%;
  min-height: 1.75rem;
  border: 1px solid var(--border);
}

.mock-bubble.user {
  background: var(--color-surface-muted);
  margin-left: auto;
  color: var(--color-text);
}

.mock-bubble.ai {
  background: rgba(56, 189, 248, 0.1);
  border-color: rgba(56, 189, 248, 0.35);
  color: var(--color-heading);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 300ms ease, transform 300ms ease;
}

.mock-bubble.ai.visible {
  opacity: 1;
  transform: none;
}

.mock-app {
  background: rgba(8, 28, 48, 0.6);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius);
  padding: 0.5rem;
  min-height: 140px;
}

.mock-nav {
  height: 8px;
  background: rgba(147, 197, 253, 0.2);
  border-radius: 0;
  margin-bottom: 0.5rem;
  width: 60%;
}

.mock-cards {
  display: flex;
  gap: 0.375rem;
  margin-bottom: 0.5rem;
}

.mock-cards div {
  flex: 1;
  height: 48px;
  background: rgba(147, 197, 253, 0.12);
  border: 1px solid var(--border);
  border-radius: 0;
}

.mock-file {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-success);
  opacity: 0;
  transition: opacity 300ms ease;
}

.mock-file.visible {
  opacity: 1;
}

/* Stats band */
.stats {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 2rem 2rem;
}

.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding: 1.75rem 2rem;
  background: var(--color-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.stat {
  text-align: left;
  padding: 0 0.5rem;
}

.stat-num {
  display: block;
  font-family: var(--font-title);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.stat-label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-top: 0.25rem;
  line-height: 1.45;
}

/* Sections */
.section {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 4rem 2rem;
}

.section-header {
  text-align: left;
  max-width: 42rem;
  margin: 0 0 2.5rem;
}

.eyebrow {
  font-family: var(--font-heading);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section-header h2 {
  font-family: var(--font-title);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-title);
  margin-bottom: 0.75rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--color-rule);
}

.section-desc {
  color: var(--color-muted);
  font-size: 1.0625rem;
  line-height: 1.58;
}

/* Pipeline diagram */
.pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.pipeline-node {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  background: var(--color-surface-muted);
  border: 1px solid var(--border);
  border-radius: 0;
  font-weight: 600;
  font-size: 0.875rem;
}

.pipeline-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-accent);
}

.pipeline-arrow {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 1rem;
}

.pipeline-feedback {
  flex-basis: 100%;
  margin-top: 0.75rem;
  font-family: var(--font-meta);
  font-size: 0.75rem;
  color: var(--color-meta);
}

/* Architecture diagram */
.diagram-wrap {
  max-width: 900px;
  margin: 0;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.diagram {
  width: 100%;
  height: auto;
}

.diagram .zone {
  fill: rgba(12, 36, 58, 0.5);
  stroke: var(--border);
  stroke-width: 1;
}

.diagram .zone-blue {
  stroke: rgba(56, 189, 248, 0.45);
}

.diagram .zone-title {
  fill: var(--color-muted);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
}

.diagram .zone-title-blue {
  fill: var(--color-accent);
}

.diagram .node {
  fill: var(--color-surface-muted);
  stroke: var(--border);
  stroke-width: 1;
}

.diagram .node-accent {
  stroke: rgba(56, 189, 248, 0.45);
}

.diagram .node-red {
  stroke: rgba(248, 113, 113, 0.45);
}

.diagram .node-title {
  fill: var(--color-text);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
}

.diagram .node-sub {
  fill: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
}

.diagram .node-sub-red {
  fill: var(--color-error);
}

.diagram .flow {
  stroke: var(--color-accent);
  stroke-width: 1.5;
  fill: none;
}

.diagram .flow-red {
  stroke: var(--color-error);
}

.diagram .arrow-head {
  fill: var(--color-accent);
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.step-card {
  background: var(--color-surface);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 1.25rem 1.5rem;
  transition: border-color 150ms ease-out, opacity 400ms ease;
}

.step-card:hover {
  border-color: var(--color-accent);
}

.step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.step-card h3 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-title);
  margin-bottom: 0.4rem;
}

.step-card p {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.55;
}

/* Features */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.feature-card {
  position: relative;
  background:
    linear-gradient(var(--grid-line-fine) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-fine) 1px, transparent 1px),
    var(--color-surface-muted);
  background-size: 12px 12px, 12px 12px, auto;
  border: 1px dashed var(--border-dashed);
  border-radius: 0;
  padding: 1.5rem;
  box-shadow: inset 0 0 0 1px rgba(191, 219, 254, 0.08);
  transition: border-color 150ms ease-out, opacity 400ms ease;
}

.feature-card::before,
.feature-card::after {
  content: "";
  position: absolute;
  width: 0.55rem;
  height: 0.55rem;
  border: 1px solid rgba(56, 189, 248, 0.7);
  pointer-events: none;
}

.feature-card::before {
  top: -1px;
  left: -1px;
  border-right: none;
  border-bottom: none;
}

.feature-card::after {
  bottom: -1px;
  right: -1px;
  border-left: none;
  border-top: none;
}

.feature-card:hover {
  border-color: rgba(56, 189, 248, 0.75);
}

.feature-icon {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  opacity: 0.9;
}

.feature-card h3 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-title);
  margin-bottom: 0.4rem;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.55;
}

/* Comparison */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.compare-col {
  background: var(--color-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.compare-good {
  border-color: rgba(56, 189, 248, 0.45);
}

.compare-bad {
  border-color: var(--border);
}

.compare-col h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.0625rem;
  margin-bottom: 1rem;
  color: var(--color-title);
}

.compare-mark {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.compare-good .compare-mark {
  color: var(--color-accent);
}

.compare-bad .compare-mark {
  color: var(--color-error);
}

.compare-col ul {
  list-style: none;
}

.compare-col li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.65rem;
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.compare-good li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.75rem;
}

.compare-bad li::before {
  content: "×";
  position: absolute;
  left: 0;
  color: var(--color-error);
  font-weight: 700;
}

/* Stack */
.stack-section {
  position: relative;
  z-index: 1;
  padding: 2rem;
}

.stack-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.stack-desc {
  color: var(--color-muted);
  margin-top: 0.75rem;
  font-size: 0.9375rem;
}

.stack-list {
  list-style: none;
  margin-top: 1.25rem;
}

.stack-list li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.65rem;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.stack-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.75rem;
}

.code-block {
  background: var(--color-surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-header {
  padding: 0.625rem 1rem;
  background: rgba(12, 36, 58, 0.95);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-meta);
}

.code-block pre {
  padding: 1.25rem;
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--color-heading);
}

/* FAQ */
.faq {
  max-width: var(--paper-width);
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 0 1.25rem;
  transition: border-color 150ms ease-out;
}

.faq-item[open] {
  border-color: var(--color-accent);
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 1rem 0;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-title);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 1.125rem;
  transition: transform 150ms ease-out;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 0 1.125rem;
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.faq-item code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-link);
  background: rgba(56, 189, 248, 0.08);
  padding: 0.125rem 0.375rem;
  border-radius: 0;
}

/* CTA */
.cta-section {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2rem 2rem 5rem;
}

.cta-card {
  max-width: var(--paper-width);
  margin: 0;
  text-align: left;
  padding: 2.5rem;
  background:
    linear-gradient(var(--grid-line-fine) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-fine) 1px, transparent 1px),
    var(--color-surface-muted);
  background-size: 12px 12px, 12px 12px, auto;
  border: 1px dashed var(--border-dashed);
  box-shadow: inset 0 0 0 1px rgba(191, 219, 254, 0.08);
}

.cta-card h2 {
  font-family: var(--font-title);
  font-size: 1.75rem;
  color: var(--color-title);
  margin-bottom: 0.65rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--color-rule);
}

.cta-card p {
  color: var(--color-muted);
  margin-bottom: 1.75rem;
  font-size: 1rem;
  line-height: 1.58;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Footer */
.footer {
  position: relative;
  z-index: 1;
  padding: 2rem;
  border-top: 1px solid var(--border);
  background: rgba(16, 42, 67, 0.6);
}

.footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-meta);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.footer-inner a {
  color: var(--color-link);
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.footer-sep {
  opacity: 0.4;
}

.footer code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-meta);
}

/* Responsive */
@media (max-width: 900px) {
  .stats-inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .browser-content {
    grid-template-columns: 1fr;
  }

  .mock-panel {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .compare-grid {
    grid-template-columns: 1fr;
  }

  .stack-inner {
    grid-template-columns: 1fr;
    padding: 1.75rem;
  }

  .hero {
    padding-top: 2rem;
  }

  .cta-card {
    max-width: 100%;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}