/* ============================================================
   GHOST//SHELL — design system
   palette pulled from images/background.png:
   void black · concrete grey · phosphor green · bone white
   ============================================================ */

:root {
  --void: #050705;
  --ink: #0a0d0a;
  --panel: #0d110d;
  --bone: #e8ece8;
  --ash: #8a918a;
  --dim: #4a524a;
  --ghost: #3dff7c;
  --ghost-soft: rgba(61, 255, 124, 0.14);
  --ghost-line: rgba(61, 255, 124, 0.35);
  --font-display: "Space Grotesk", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--void);
  color: var(--bone);
  font-family: var(--font-display);
  font-weight: 300;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

[data-mono] { font-family: var(--font-mono); }

::selection { background: var(--ghost); color: var(--void); }

/* ---------- ambient background ---------- */

.bg-layer { position: fixed; inset: 0; z-index: -3; }

.bg-image {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  pointer-events: none;
}
.bg-image img {
  width: 100%; height: 100%;
  object-fit: contain;
  animation: bg-glitch 7s steps(1, end) infinite;
}

/* periodic glitch burst — ~0.6s of interference every 7s */
@keyframes bg-glitch {
  0%, 90%, 100% { transform: none; filter: none; clip-path: none; }
  91% { transform: translate(-7px, 2px) skewX(1.5deg); filter: contrast(1.5) hue-rotate(70deg); clip-path: inset(8% 0 62% 0); }
  93% { transform: translate(6px, -2px); filter: hue-rotate(-45deg) saturate(4); clip-path: inset(48% 0 22% 0); }
  95% { transform: translate(-4px, 0) scaleX(1.01); filter: brightness(1.7); clip-path: inset(70% 0 6% 0); }
  97% { transform: translate(3px, 1px); filter: hue-rotate(120deg); clip-path: inset(30% 0 40% 0); }
  98% { transform: none; filter: none; clip-path: none; }
}

.bg-gradient {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 68% 22%, rgba(61, 255, 124, 0.05), transparent 55%);
}

/* film grain + scanlines */
.bg-noise {
  position: absolute; inset: -50%;
  background-image: repeating-linear-gradient(
    0deg, transparent 0 2px, rgba(0, 0, 0, 0.22) 2px 3px
  );
  opacity: 0.5;
  animation: grain 0.9s steps(4) infinite;
  pointer-events: none;
}
@keyframes grain {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-1.5%, 1%); }
  50% { transform: translate(1%, -1.5%); }
  75% { transform: translate(-1%, -0.5%); }
  100% { transform: translate(0, 0); }
}

/* ---------- navigation ---------- */

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.4rem 3rem;
  transition: background 0.5s var(--ease-out), padding 0.5s var(--ease-out),
              border-color 0.5s var(--ease-out);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  padding: 0.85rem 3rem;
  background: rgba(5, 7, 5, 0.78);
  backdrop-filter: blur(14px);
  border-bottom-color: rgba(232, 236, 232, 0.07);
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 0.95rem; font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--bone); text-decoration: none;
  position: relative;
}
.nav-logo .dim { color: var(--ghost); }
.nav-logo::after {
  content: "";
  position: absolute; left: 0; bottom: -4px;
  width: 0; height: 1px; background: var(--ghost);
  transition: width 0.4s var(--ease-out);
}
.nav-logo:hover::after { width: 100%; }

/* hamburger toggle — hidden on desktop */
.nav-toggle {
  display: none;
  width: 28px; height: 22px;
  background: transparent; border: none;
  cursor: pointer; padding: 0;
  color: var(--bone);
  z-index: 110;
}
.nav-toggle svg { display: block; width: 100%; height: 100%; }
.nav-toggle line { transition: transform 0.3s var(--ease-out), opacity 0.3s, stroke 0.3s; transform-origin: center; }
.nav.is-open .nav-toggle { color: var(--ghost); }
.nav.is-open .nav-toggle line:nth-child(1) { transform: translateY(10px) rotate(45deg); }
.nav.is-open .nav-toggle line:nth-child(2) { opacity: 0; }
.nav.is-open .nav-toggle line:nth-child(3) { transform: translateY(-10px) rotate(-45deg); }

.nav-menu {
  display: flex; gap: 2.4rem; align-items: center;
}

.nav-link {
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ash); text-decoration: none;
  padding: 0.3rem 0;
  transition: color 0.3s;
}
.nav-link .idx {
  color: var(--ghost); font-size: 0.6rem;
  margin-right: 0.5rem; opacity: 0.7;
  transition: opacity 0.3s;
}
/* bracket micro-interaction */
.nav-link::before, .nav-link::after {
  position: absolute; top: 50%; transform: translateY(-50%);
  color: var(--ghost); opacity: 0;
  transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}
.nav-link::before { content: "["; left: -0.9rem; transform: translate(-4px, -50%); }
.nav-link::after  { content: "]"; right: -0.9rem; transform: translate(4px, -50%); }
.nav-link:hover { color: var(--bone); }
.nav-link:hover::before, .nav-link:hover::after { opacity: 1; transform: translate(0, -50%); }

.nav-cta {
  border: 1px solid var(--ghost-line);
  padding: 0.55rem 1.1rem;
  color: var(--ghost);
  transition: background 0.35s var(--ease-out), color 0.35s, box-shadow 0.35s;
}
.nav-cta::before, .nav-cta::after { content: none; }
.nav-cta:hover {
  background: var(--ghost); color: var(--void);
  box-shadow: 0 0 28px rgba(61, 255, 124, 0.35);
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 8rem 3rem 4rem;
}

/* giant layered typography — SHELL sinks behind the 3D mesh */
.hero-word {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  justify-content: center; align-items: flex-end;
  pointer-events: none;
  padding-right: 2vw;
  will-change: transform;
}
.hero-word-ghost {
  font-family: var(--font-mono);
  font-size: clamp(0.85rem, 1.4vw, 1.3rem);
  letter-spacing: 1.2em;
  color: var(--ash);
  margin-right: 0.5vw; margin-bottom: -1vw;
  text-transform: uppercase;
  z-index: 3;
}
.hero-word-shell {
  font-size: clamp(6rem, 17vw, 19rem);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: rgba(232, 236, 232, 0.1);
  z-index: 1;
  user-select: none;
}

/* 3D mesh sits above the fading word, below the UI */
.hero-canvas-wrap {
  position: absolute; inset: 0; z-index: 2;
  display: grid; place-items: center;
  pointer-events: none;
}
#mesh-canvas { width: 100%; height: 100%; display: block; }

.hero-ui { position: relative; z-index: 4; max-width: 620px; }

.hero-tag {
  font-size: 0.72rem; letter-spacing: 0.22em;
  color: var(--ghost); text-transform: uppercase;
  margin-bottom: 2rem;
  display: flex; align-items: center; gap: 0.6rem;
}
.blink { animation: blink 1.1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-headline {
  font-size: clamp(2.6rem, 5.4vw, 4.6rem);
  font-weight: 500; line-height: 1.02; letter-spacing: -0.02em;
  margin-bottom: 1.8rem;
}
.hero-headline em {
  font-style: normal; color: var(--ghost);
  text-shadow: 0 0 40px rgba(61, 255, 124, 0.45);
}

.hero-sub {
  color: var(--ash); font-size: 1.02rem; line-height: 1.65;
  max-width: 46ch; margin-bottom: 2.6rem;
}

.hero-actions { display: flex; gap: 1.2rem; flex-wrap: wrap; }

.btn {
  font-family: var(--font-mono);
  font-size: 0.78rem; letter-spacing: 0.14em;
  text-decoration: none;
  padding: 0.95rem 1.7rem;
  position: relative; overflow: hidden;
  transition: color 0.35s var(--ease-out), box-shadow 0.35s;
}
.btn-solid {
  background: var(--ghost); color: var(--void); font-weight: 500;
}
.btn-solid::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.5) 50%, transparent 60%);
  transform: translateX(-120%);
  transition: transform 0.7s var(--ease-out);
}
.btn-solid:hover::after { transform: translateX(120%); }
.btn-solid:hover { box-shadow: 0 0 34px rgba(61, 255, 124, 0.4); }
.btn-ghost {
  border: 1px solid rgba(232, 236, 232, 0.25); color: var(--bone);
  transition: border-color 0.35s, background 0.35s;
}
.btn-ghost:hover { border-color: var(--ghost); background: var(--ghost-soft); }

.hero-meta {
  position: absolute; z-index: 4;
  left: 3rem; right: 3rem; bottom: 2rem;
  display: flex; justify-content: space-between;
  font-size: 0.62rem; letter-spacing: 0.2em; color: var(--dim);
  text-transform: uppercase;
}
.scroll-hint { display: inline-flex; align-items: center; gap: 0.5rem; }
.scroll-hint i {
  display: block; width: 1px; height: 26px;
  background: linear-gradient(var(--ghost), transparent);
  animation: drip 1.6s var(--ease-out) infinite;
}
@keyframes drip {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- sections ---------- */

.section { padding: 9rem 3rem; position: relative; max-width: 1400px; margin: 0 auto; }

.section-head { margin-bottom: 4.5rem; }
.section-idx {
  display: block;
  font-size: 0.7rem; letter-spacing: 0.28em; color: var(--ghost);
  text-transform: uppercase; margin-bottom: 1.4rem;
}
.section-title {
  font-size: clamp(2.2rem, 4.6vw, 3.8rem);
  font-weight: 500; line-height: 1.04; letter-spacing: -0.02em;
}
.section-title em { font-style: normal; color: var(--ghost); }

/* capability grid */
.cap-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1px; background: rgba(232, 236, 232, 0.08);
  border: 1px solid rgba(232, 236, 232, 0.08);
}
.cap-card {
  position: relative;
  background: rgba(10, 13, 10, 0.82);
  backdrop-filter: blur(6px);
  padding: 2.6rem 2.2rem 3.4rem;
  transition: background 0.45s var(--ease-out);
  overflow: hidden;
}
.cap-card:hover { background: rgba(13, 17, 13, 0.95); }
.cap-num { font-size: 0.66rem; letter-spacing: 0.2em; color: var(--ghost); }
.cap-card h3 {
  font-size: 1.25rem; font-weight: 500;
  margin: 1.3rem 0 1rem; letter-spacing: -0.01em;
}
.cap-card p { color: var(--ash); font-size: 0.92rem; line-height: 1.7; }
.cap-line {
  position: absolute; left: 0; bottom: 0;
  width: 100%; height: 2px;
  background: var(--ghost);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.55s var(--ease-out);
}
.cap-card:hover .cap-line { transform: scaleX(1); }

/* terminal */
.section-terminal .section-head { margin-bottom: 3.5rem; }
.terminal {
  border: 1px solid rgba(61, 255, 124, 0.22);
  background: rgba(5, 8, 5, 0.88);
  backdrop-filter: blur(8px);
  box-shadow: 0 0 60px rgba(61, 255, 124, 0.06), inset 0 0 80px rgba(0, 0, 0, 0.5);
  max-width: 860px;
}
.terminal-bar {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.1rem;
  border-bottom: 1px solid rgba(61, 255, 124, 0.16);
  font-size: 0.66rem; letter-spacing: 0.08em; color: var(--dim);
}
.t-dot { width: 9px; height: 9px; border-radius: 50%; border: 1px solid var(--ghost-line); }
.t-dot:first-child { background: var(--ghost); }
.t-title { margin-left: 0.8rem; }
.terminal-body {
  padding: 1.6rem 1.4rem 1.9rem;
  font-size: 0.82rem; line-height: 1.85;
  color: var(--ghost);
  min-height: 270px;
  white-space: pre-wrap;
  text-shadow: 0 0 8px rgba(61, 255, 124, 0.35);
}
.terminal-body .ok { color: var(--bone); }
.terminal-body .deny { color: #ff5f56; }
.terminal-body .dim { color: var(--dim); }
.terminal-body .cursor {
  display: inline-block; width: 0.55em; height: 1.1em;
  background: var(--ghost); vertical-align: text-bottom;
  animation: blink 1s steps(2) infinite;
}

/* stats */
.stat-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 3rem; margin-top: 5rem;
}
.stat { position: relative; padding-left: 1.2rem; }
.stat::before {
  content: ""; position: absolute; left: 0; top: 0.4rem; bottom: 0.4rem;
  width: 1px; background: var(--ghost-line);
}
.stat-num {
  font-size: clamp(2.4rem, 4vw, 3.4rem); font-weight: 500;
  letter-spacing: -0.02em; color: var(--bone);
}
.stat-suffix { font-size: 1.2rem; color: var(--ghost); margin-left: 0.2rem; }
.stat-label {
  display: block; margin-top: 0.5rem;
  font-size: 0.62rem; letter-spacing: 0.24em; color: var(--dim);
}

/* protocol list */
.proto-list { display: flex; flex-direction: column; }
.proto-item {
  display: grid; grid-template-columns: 110px 1fr; gap: 1rem 3rem;
  padding: 3rem 0;
  border-top: 1px solid rgba(232, 236, 232, 0.08);
  transition: padding-left 0.5s var(--ease-out);
}
.proto-item:last-child { border-bottom: 1px solid rgba(232, 236, 232, 0.08); }
.proto-item:hover { padding-left: 1.4rem; }
.proto-idx { font-size: 0.72rem; letter-spacing: 0.2em; color: var(--ghost); padding-top: 0.5rem; }
.proto-item h3 { font-size: 1.5rem; font-weight: 500; margin-bottom: 0.9rem; letter-spacing: -0.01em; }
.proto-item p { color: var(--ash); max-width: 58ch; line-height: 1.7; font-size: 0.95rem; }

/* cta */
.section-cta { text-align: center; padding: 11rem 3rem; }
.cta-inner .section-idx { margin-bottom: 1.6rem; }
.cta-title { font-size: clamp(2.8rem, 6vw, 5.2rem); font-weight: 500; line-height: 1.02; letter-spacing: -0.02em; margin-bottom: 1.6rem; }
.cta-title em { font-style: normal; color: var(--ghost); text-shadow: 0 0 40px rgba(61,255,124,0.4); }
.cta-sub { color: var(--ash); margin-bottom: 3rem; font-size: 1rem; }
.btn-big { display: inline-block; padding: 1.2rem 2.6rem; font-size: 0.85rem; }

/* footer */
.footer {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  padding: 2rem 3rem;
  border-top: 1px solid rgba(232, 236, 232, 0.07);
  font-size: 0.62rem; letter-spacing: 0.18em; color: var(--dim);
  text-transform: uppercase;
}
.footer .dim { color: var(--ghost); opacity: 0.55; }

/* ---------- scroll reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(42px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  /* fill the screen; anchor on the ghost side of the frame */
  .bg-image img { object-fit: cover; object-position: 68% center; }

  .nav { padding: 1rem 1.2rem; }
  .nav.is-scrolled { padding: 0.75rem 1.2rem; }
  .nav-logo { font-size: 0.82rem; }

  /* hamburger + dropdown */
  .nav-toggle { display: block; }
  .nav-menu {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 1rem 1.2rem 1.4rem;
    background: rgba(5, 7, 5, 0.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(232, 236, 232, 0.08);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.45s var(--ease-out), opacity 0.35s;
  }
  .nav.is-open .nav-menu {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link {
    font-size: 0.85rem; letter-spacing: 0.14em;
    padding: 0.9rem 0; border-bottom: 1px solid rgba(232,236,232,0.06);
  }
  .nav-link .idx { display: inline; margin-right: 0.8rem; }
  .nav-link::before, .nav-link::after { content: none; }
  .nav-cta {
    margin-top: 0.6rem; text-align: center;
    border-color: var(--ghost); color: var(--ghost);
  }

  .hero { padding: 6.5rem 1.2rem 5rem; }
  .hero-word { display: none; }
  .hero-headline { font-size: clamp(2.1rem, 6vw, 3.6rem); }
  .hero-sub { font-size: 0.95rem; }
  .hero-meta { left: 1.2rem; right: 1.2rem; }
  .hero-meta span:first-child, .hero-meta span:last-child { display: none; }
  .hero-meta { justify-content: center; }

  .section { padding: 5rem 1.2rem; }
  .section-head { margin-bottom: 3rem; }
  .section-title { font-size: clamp(1.8rem, 6vw, 3rem); }
  .cap-card { padding: 2rem 1.5rem 2.6rem; }

  .terminal-body { font-size: 0.72rem; overflow-x: auto; }
  .stat-row { gap: 1.8rem; margin-top: 3.5rem; }
  .stat-num { font-size: clamp(2rem, 7vw, 2.6rem); }
  .stat-label { font-size: 0.55rem; letter-spacing: 0.12em; }

  .proto-item { grid-template-columns: 1fr; gap: 0.6rem; padding: 2.2rem 0; }
  .proto-item h3 { font-size: 1.25rem; }
  .proto-item:hover { padding-left: 0; }

  .section-cta { padding: 7rem 1.2rem; }
  .cta-title { font-size: clamp(2.4rem, 8vw, 4rem); }
  .cta-sub { font-size: 0.95rem; }

  .btn { display: block; width: 100%; text-align: center; }

  .footer { padding: 1.6rem 1.2rem; justify-content: center; text-align: center; gap: 0.6rem; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bg-noise, .blink, .scroll-hint i, .bg-image img { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
}