/* ============================================================
   APPOSTLE — field-manual landing page
   tokens resolved from .brand/ + field-manual role
   ============================================================ */

:root {
  /* COLORS — from .brand/colors.md */
  --primary: #000000;
  --accent: #ffffff;
  --secondary: #111111;
  --highlight: #f0f0f0;

  /* derived opacities (from accent) */
  --accent-70: rgba(255, 255, 255, 0.7);
  --accent-50: rgba(255, 255, 255, 0.5);
  --accent-40: rgba(255, 255, 255, 0.4);
  --accent-25: rgba(255, 255, 255, 0.25);
  --accent-12: rgba(255, 255, 255, 0.12);
  --accent-06: rgba(255, 255, 255, 0.06);
  --accent-04: rgba(255, 255, 255, 0.04);
  --accent-02: rgba(255, 255, 255, 0.02);

  --border: rgba(255, 255, 255, 0.14);
  --border-dim: rgba(255, 255, 255, 0.08);

  /* status (only intentional non-mono colour) */
  --ok: #7fe0a0;

  /* TYPOGRAPHY — from .brand/typography.md */
  --font-display: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  /* SHAPES — from .brand/shapes.md */
  --chamfer: 14px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --clip-chamfer: polygon(
    var(--chamfer) 0,
    100% 0,
    100% calc(100% - var(--chamfer)),
    calc(100% - var(--chamfer)) 100%,
    0 100%,
    0 var(--chamfer)
  );

  /* SHADOWS — from .brand/shadows.md */
  --shadow-offset: 4px 4px 0 var(--accent);
  --shadow-glow: 0 0 40px rgba(255, 255, 255, 0.2);

  /* SPACING — from .brand/spacing.md */
  --container: calc(1200px + 6rem);
  --gutter: 2rem;
}

/* ============================================================
   RESET / BASE
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100dvh;
  background: var(--primary);
  color: var(--accent-70);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 1; color: var(--accent); }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

::selection { background: var(--accent); color: var(--primary); }

/* ============================================================
   LAYOUT PRIMITIVES
   ============================================================ */

main {
  display: flex;
  flex-direction: column;
  gap: 0;
}

main > section {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 6rem 3rem;
  position: relative;
}

@media (max-width: 768px) {
  main > section { padding: 4rem 1.25rem; }
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-50);
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--accent);
  margin: 0;
}

/* ============================================================
   WATERMARK BACKDROP
   ============================================================ */

.watermark {
  position: fixed;
  inset: 0;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: clamp(8rem, 18vw, 16rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent);
  opacity: 0.025;
  white-space: nowrap;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 0;
  user-select: none;
  transform: rotate(-90deg);
}

/* ============================================================
   NAV
   ============================================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
  padding: 1.25rem 3rem;
  background: var(--primary);
  border-bottom: 1px solid var(--border);
}

@media (max-width: 768px) {
  .nav { padding: 1rem 1.25rem; }
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-50);
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--border);
  clip-path: var(--clip-chamfer);
}

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

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ok);
  animation: blink 1.5s step-end infinite;
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0.2; }
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-70);
  text-transform: uppercase;
}

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

.nav-cta { padding: 0.65rem 1rem; font-size: 0.65rem; }

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  clip-path: var(--clip-chamfer);
  transition: opacity 0.2s, color 0.2s, background 0.2s;
  cursor: pointer;
  border: 0;
}

.btn-primary {
  background: var(--accent);
  color: var(--primary);
}
.btn-primary:hover { opacity: 0.85; color: var(--primary); }

.btn-secondary {
  background: transparent;
  color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--border);
}
.btn-secondary:hover { background: var(--accent-06); opacity: 1; color: var(--accent); }

/* ============================================================
   HERO
   ============================================================ */

.hero {
  padding-top: 8rem !important;
  padding-bottom: 8rem !important;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.hero-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-50);
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--border);
  text-transform: uppercase;
  clip-path: var(--clip-chamfer);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(3rem, 9vw, 7rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--accent);
  margin: 0;
  text-transform: uppercase;
}

.hero-title-faded {
  display: inline-block;
  color: var(--accent-40);
  font-weight: 700;
}

.hero-subtitle {
  max-width: 38rem;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--accent-70);
  margin: 0;
}

.hero-ctas {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* ============================================================
   TERMINAL
   ============================================================ */

.terminal {
  margin-top: 3rem;
  background: var(--secondary);
  clip-path: var(--clip-chamfer);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  border: 1px solid var(--border);
  position: relative;
}

/* clip-path eats descendant box-shadows; rely on a wrapper for offset effect */

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: var(--accent-04);
  border-bottom: 1px solid var(--border-dim);
}

.terminal-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-25);
}

.terminal-title {
  margin-left: auto;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--accent-50);
  text-transform: uppercase;
}

.terminal-body {
  padding: 1.25rem 1.5rem 1.5rem;
  color: var(--accent);
}

.terminal-line { white-space: pre-wrap; }
.terminal-line .prompt { color: var(--accent-50); margin-right: 0.5rem; }
.terminal-line.muted { color: var(--accent-50); }
.terminal-line.ok { color: var(--ok); }

.caret {
  display: inline-block;
  margin-left: 0.15rem;
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

/* ============================================================
   PROBLEM
   ============================================================ */

.problem-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
  .problem-list { grid-template-columns: 1fr; }
}

.problem-list li {
  display: flex;
  gap: 1.25rem;
  padding: 2rem 1.5rem;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.problem-list li:nth-child(2n) { border-right: 0; }
@media (max-width: 768px) { .problem-list li { border-right: 0; } }

.problem-list .num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-40);
  flex-shrink: 0;
  padding-top: 0.2rem;
}

.problem-list p {
  margin: 0;
  color: var(--accent);
  font-size: 1.0625rem;
  line-height: 1.55;
  letter-spacing: -0.01em;
}

/* ============================================================
   SOLUTION DIAGRAM
   ============================================================ */

.solution { text-align: center; }
.solution .section-header { align-items: center; text-align: center; }

.diagram {
  font-family: var(--font-mono);
  font-size: clamp(0.55rem, 1.1vw, 0.85rem);
  line-height: 1.4;
  color: var(--accent);
  background: var(--secondary);
  padding: 2.5rem 1.5rem;
  margin: 0 auto;
  max-width: 70rem;
  overflow-x: auto;
  white-space: pre;
  text-align: left;
  border: 1px solid var(--border);
  clip-path: var(--clip-chamfer);
  display: inline-block;
}

.diagram-caption {
  margin-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--accent-50);
  text-transform: uppercase;
}

/* ============================================================
   CAPABILITIES
   ============================================================ */

.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 1024px) { .cap-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .cap-grid { grid-template-columns: 1fr; } }

.cap-card {
  position: relative;
  padding: 2rem 1.75rem;
  background: var(--secondary);
  border: 1px solid var(--border);
  clip-path: var(--clip-chamfer);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: background 0.2s, color 0.2s;
}

.cap-card:hover {
  background: var(--accent-06);
}

.cap-card.featured {
  background: var(--accent);
  color: var(--primary);
}
.cap-card.featured h3 { color: var(--primary); }
.cap-card.featured p { color: rgba(0, 0, 0, 0.75); }
.cap-card.featured .cap-num { color: rgba(0, 0, 0, 0.5); }

.cap-num {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-40);
}

.cap-card h3 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0;
  text-transform: uppercase;
}

.cap-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--accent-70);
}

/* ============================================================
   INSTALL
   ============================================================ */

.install-terminal {
  max-width: 56rem;
  margin: 0 auto;
}

/* ============================================================
   FAQ
   ============================================================ */

.faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border);
}

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

.faq-q {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.5rem;
  align-items: center;
  width: 100%;
  padding: 1.5rem 0;
  text-align: left;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--accent);
  transition: opacity 0.2s;
}

.faq-q:hover { opacity: 0.7; }

.faq-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-40);
}

.faq-icon {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--accent-50);
  transition: transform 0.2s;
}

.faq-item.open .faq-icon { transform: rotate(45deg); }

.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
  font-size: 1rem;
  color: var(--accent-70);
  line-height: 1.55;
}

.faq-a > * { overflow: hidden; }

.faq-item.open .faq-a {
  grid-template-rows: 1fr;
  padding-bottom: 1.5rem;
}

.faq-a code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--accent-06);
  padding: 0.1em 0.35em;
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  position: relative;
  border-top: 1px solid var(--border);
  padding: 5rem 3rem 2rem;
  margin-top: 4rem;
  overflow: hidden;
}

@media (max-width: 768px) {
  .footer { padding: 4rem 1.25rem 2rem; }
}

.footer-grid {
  position: relative;
  z-index: 2;
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}

@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; gap: 2rem; } }

.footer-brand .brand { font-size: 1.1rem; margin-bottom: 1rem; }

.footer-tagline {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  margin: 0 0 0.5rem;
  max-width: 24rem;
}

.footer-pillars {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-40);
  margin: 0;
  text-transform: uppercase;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-40);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.footer-col a { color: var(--accent-70); font-size: 0.95rem; }
.footer-col a:hover { color: var(--accent); }

.footer-watermark {
  position: absolute;
  bottom: -2rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(8rem, 24vw, 20rem);
  letter-spacing: -0.04em;
  color: var(--accent);
  opacity: 0.03;
  white-space: nowrap;
  pointer-events: none;
  z-index: 1;
}

.footer-bottom {
  position: relative;
  z-index: 2;
  max-width: var(--container);
  margin: 4rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 2rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-40);
  text-transform: uppercase;
  flex-wrap: wrap;
}

/* ============================================================
   ENTRY ANIMATION
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.4s cubic-bezier(.25, 1, .5, 1), transform 0.4s cubic-bezier(.25, 1, .5, 1);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}