/* ============================================================
   RUCKSACK — hackerish anime / manga landing page
   palette: midnight base, electric cyan, hot magenta, acid green
   ============================================================ */

:root {
  --bg: #070a10;
  --bg-2: #0b1019;
  --panel: #0d1220;
  --ink: #e8f0ff;
  --ink-dim: #93a1bd;
  --cyan: #37f2ff;
  --magenta: #ff2d95;
  --acid: #9dff00;
  --amber: #ffb020;
  --line: rgba(232, 240, 255, 0.14);
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 500px at 80% -100px, rgba(55, 242, 255, 0.07), transparent 60%),
    radial-gradient(900px 500px at 10% 30%, rgba(255, 45, 149, 0.05), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

code { font-family: var(--mono); }

/* ---------- scanlines overlay ---------- */
.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 60;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0 2px,
    rgba(0, 0, 0, 0.11) 2px 3px
  );
  mix-blend-mode: multiply;
  opacity: 0.5;
}

/* ---------- header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.site-header.is-scrolled {
  background: rgba(7, 10, 16, 0.86);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.14em;
}
.brand:hover { text-decoration: none; }
.brand__mark { font-size: 26px; line-height: 1; display: block; }
.brand__word { font-size: 15px; }

.site-header nav {
  display: flex;
  gap: clamp(10px, 2.5vw, 26px);
  font-size: 13px;
  letter-spacing: 0.08em;
}
.site-header nav a { color: var(--ink-dim); text-transform: uppercase; }
.site-header nav a:hover { color: var(--cyan); text-decoration: none; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: min(92vh, 900px);
  display: flex;
  align-items: flex-end;
  isolation: isolate;
}

.hero__art {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
}

/* Aspect-locked stage reproduces the cover-crop, so fx layers positioned in
   image percentages stay registered to the art at any viewport size. */
.hero__stage {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  height: 100%;
  min-width: 100%;
  aspect-ratio: 2400 / 1018;
}

.hero__stage > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

/* ---------- hero fx: pack glow + phone code ---------- */
.fx { position: absolute; pointer-events: none; }

.fx-glow {
  left: 55.4%;
  top: 33.5%;
  width: 13%;
  aspect-ratio: 1 / 1.5;
  transform: translate(-50%, -50%);
  background: radial-gradient(50% 50% at 50% 50%, rgba(55, 242, 255, 0.5), rgba(55, 242, 255, 0.12) 55%, transparent 72%);
  mix-blend-mode: screen;
  filter: blur(8px);
  opacity: 0.4;
}

.fx-glow--flicker {
  width: 7%;
  left: 55%;
  top: 30%;
  aspect-ratio: 1 / 1.2;
  opacity: 0;
}

/* Screen quad measured from the art: center (68.9%, 30.9%), top edge +16°,
   long axis leaning a further ~22° (foreshortening) — hence rotate + skewX.
   Sized inside the screen and mask-faded so edges never touch the bezel. */
.fx-phone {
  left: 68.9%;
  top: 30.9%;
  width: 1.7%;
  height: 6.6%;
  transform: translate(-50%, -50%) rotate(16deg) skewX(-22deg);
  border-radius: 4px;
  overflow: hidden;
  mix-blend-mode: screen;
  -webkit-mask-image: radial-gradient(closest-side, #000 55%, transparent 100%);
  mask-image: radial-gradient(closest-side, #000 55%, transparent 100%);
}

.fx-phone__code {
  position: absolute;
  inset: 0 4%;
  background:
    repeating-linear-gradient(to bottom, rgba(157, 255, 0, 0.5) 0 1.5px, transparent 1.5px 5px),
    repeating-linear-gradient(to bottom, rgba(55, 242, 255, 0.2) 0 1px, transparent 1px 10px);
  filter: blur(0.5px);
  opacity: 0.38;
}

@media (prefers-reduced-motion: no-preference) {
  .fx-glow { animation: pack-breathe 4.6s ease-in-out infinite; }
  .fx-glow--flicker { animation: pack-flicker 7.3s linear infinite; }
  .fx-phone__code { animation: code-scroll 5s linear infinite; }
}

@keyframes pack-breathe {
  0%, 100% { opacity: 0.3; transform: translate(-50%, -50%) scale(0.97); }
  50% { opacity: 0.58; transform: translate(-50%, -50%) scale(1.05); }
}

/* brief irregular surge, like a burst of agent activity inside the bag */
@keyframes pack-flicker {
  0%, 55%, 61%, 100% { opacity: 0; }
  57%, 59.5% { opacity: 0.5; }
  58% { opacity: 0.18; }
}

/* both gradient periods (6px, 10px) divide 60px, so the loop is seamless */
@keyframes code-scroll {
  to { background-position-y: -60px, -60px; }
}

.hero__shade {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(to top, var(--bg) 4%, rgba(7, 10, 16, 0.82) 30%, rgba(7, 10, 16, 0.25) 60%, rgba(7, 10, 16, 0.45) 100%),
    linear-gradient(100deg, rgba(7, 10, 16, 0.8) 0%, transparent 55%);
}

.hero__content {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: 140px clamp(16px, 4vw, 40px) clamp(48px, 8vh, 90px);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--acid);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(38px, 7.5vw, 84px);
  line-height: 1.02;
  letter-spacing: 0.01em;
  font-weight: 800;
}

/* glitch title */
.glitch {
  position: relative;
  text-shadow:
    2px 0 0 rgba(255, 45, 149, 0.75),
    -2px 0 0 rgba(55, 242, 255, 0.75);
}
.glitch::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  color: var(--ink);
  clip-path: inset(42% 0 34% 0);
  transform: translateX(3px);
  text-shadow: -3px 0 0 var(--magenta);
  opacity: 0;
}
@media (prefers-reduced-motion: no-preference) {
  .glitch::after { animation: glitch-slice 5s infinite steps(1); }
  @keyframes glitch-slice {
    0%, 92%, 100% { opacity: 0; }
    93% { opacity: 1; clip-path: inset(12% 0 74% 0); transform: translateX(-4px); }
    94.5% { opacity: 1; clip-path: inset(58% 0 18% 0); transform: translateX(4px); }
    96% { opacity: 0; }
  }
}

.lede {
  margin: 0 0 26px;
  max-width: 640px;
  color: var(--ink-dim);
  font-size: clamp(15px, 1.8vw, 17px);
}
.lede strong { color: var(--ink); }
.lede--muted {
  margin-top: -12px;
  font-size: clamp(13px, 1.5vw, 15px);
  opacity: 0.82;
}

/* install one-liner */
.install-line {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 640px;
  padding: 13px 16px;
  background: rgba(7, 10, 16, 0.85);
  border: 1px solid rgba(55, 242, 255, 0.45);
  box-shadow: 0 0 0 1px rgba(7, 10, 16, 0.9), 6px 6px 0 rgba(55, 242, 255, 0.16);
  overflow-x: auto;
}
.install-line__prompt { color: var(--acid); flex: none; }
.install-line__cmd { white-space: nowrap; font-size: clamp(12px, 1.6vw, 15px); }

.copy {
  flex: none;
  margin-left: auto;
  padding: 6px 12px;
  border: 1px solid var(--cyan);
  background: transparent;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.copy:hover { background: var(--cyan); color: #04252a; }
.copy.is-copied { border-color: var(--acid); color: var(--acid); background: transparent; }

.hero__actions { display: flex; gap: 14px; margin-top: 26px; flex-wrap: wrap; }

.button {
  display: inline-block;
  padding: 12px 22px;
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--line);
}
.button:hover { text-decoration: none; }
.button--primary {
  background: var(--magenta);
  border-color: var(--magenta);
  color: #fff;
  box-shadow: 4px 4px 0 rgba(255, 45, 149, 0.3);
}
.button--primary:hover { transform: translate(-1px, -1px); box-shadow: 6px 6px 0 rgba(255, 45, 149, 0.35); }
.button--secondary { color: var(--ink); }
.button--secondary:hover { border-color: var(--cyan); color: var(--cyan); }

/* ---------- ticker ---------- */
.ticker {
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(157, 255, 0, 0.05);
  padding: 8px 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--acid);
  white-space: nowrap;
}
.ticker__track { display: inline-flex; }
@media (prefers-reduced-motion: no-preference) {
  .ticker__track { animation: ticker 30s linear infinite; }
  @keyframes ticker { to { transform: translateX(-50%); } }
}

/* ---------- sections ---------- */
.section {
  width: min(1160px, 100%);
  margin: 0 auto;
  padding: clamp(60px, 9vh, 110px) clamp(16px, 4vw, 40px);
}

.section--alt {
  width: 100%;
  max-width: none;
  background:
    radial-gradient(rgba(232, 240, 255, 0.05) 1px, transparent 1.5px);
  background-size: 14px 14px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section--alt > * { width: min(1160px, 100%); margin-left: auto; margin-right: auto; }

.section__header { margin-bottom: 38px; }
.section__header h2 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4.5vw, 46px);
  letter-spacing: 0.06em;
  text-shadow: 3px 3px 0 rgba(55, 242, 255, 0.18);
}
.section__sub { margin: 0; color: var(--ink-dim); max-width: 640px; }

/* ---------- comic panels ---------- */
.comic {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

.panel {
  margin: 0;
  transform: rotate(var(--tilt, 0deg));
  background: var(--panel);
  border: 3px solid var(--ink);
  box-shadow: 8px 8px 0 rgba(55, 242, 255, 0.22);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.panel:nth-child(even) { box-shadow: 8px 8px 0 rgba(255, 45, 149, 0.22); }
.panel:hover { transform: rotate(0deg) translate(-2px, -4px); box-shadow: 12px 12px 0 rgba(157, 255, 0, 0.25); z-index: 2; }

.panel img { display: block; width: 100%; height: auto; border-bottom: 3px solid var(--ink); }

.panel figcaption {
  padding: 12px 14px 16px;
  font-size: 13px;
  color: var(--ink-dim);
}
.panel figcaption code { color: var(--acid); font-size: 12px; word-break: break-word; }
.panel__num {
  display: block;
  margin-bottom: 6px;
  color: var(--magenta);
  font-size: 11px;
  letter-spacing: 0.22em;
}

/* ---------- cockpit (panel + cards split) ---------- */
.cockpit {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: clamp(20px, 3.5vw, 44px);
  align-items: center;
}

.panel--cockpit { max-width: 420px; justify-self: center; }

.cockpit__cards { display: grid; gap: clamp(14px, 2vw, 22px); }

@media (max-width: 980px) {
  .cockpit { grid-template-columns: 1fr; }
  .panel--cockpit { max-width: 480px; }
}

/* ---------- loadout cards ---------- */
.loadout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

.card {
  padding: 18px;
  background: rgba(7, 10, 16, 0.75);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:nth-child(2n) { border-left-color: var(--magenta); }
.card:nth-child(3n) { border-left-color: var(--acid); }
.card:hover { transform: translateY(-3px); border-color: rgba(55, 242, 255, 0.4); }

.card__cmd {
  display: block;
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 13.5px;
  word-break: break-word;
}
.card__cmd span { color: var(--acid); margin-right: 8px; }
.card p { margin: 0; font-size: 13.5px; color: var(--ink-dim); }
.card p code { color: var(--cyan); font-size: 12.5px; }
.card p strong { color: var(--ink); }

/* ---------- terminal (install) ---------- */
.terminal {
  max-width: 780px;
  margin: 0 auto;
  background: #05070c;
  border: 1px solid rgba(55, 242, 255, 0.35);
  box-shadow: 10px 10px 0 rgba(55, 242, 255, 0.12);
}

.install-note {
  max-width: 780px;
  margin: 18px auto 0;
  color: var(--ink-dim);
  font-size: 13px;
  line-height: 1.55;
}
.install-note code {
  color: var(--ink);
  font-size: 0.92em;
}

.terminal__bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.terminal__bar span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--line);
}
.terminal__bar span:nth-child(1) { background: #ff5f57; }
.terminal__bar span:nth-child(2) { background: var(--amber); }
.terminal__bar span:nth-child(3) { background: #28c840; }
.terminal__bar em { margin-left: 10px; font-style: normal; font-size: 12px; color: var(--ink-dim); }

.terminal__body { padding: 16px 18px 20px; font-size: 13.5px; }

.terminal__line {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 0;
  overflow-x: auto;
}
.terminal__line code { white-space: nowrap; }
.terminal__line--dim { opacity: 0.75; }

.t-prompt { color: var(--acid); margin-right: 8px; }
.t-comment { color: var(--ink-dim); }

.terminal__out {
  margin: 10px 0 18px;
  padding: 0 0 0 20px;
  color: var(--cyan);
  font-size: 12.5px;
  line-height: 1.7;
  white-space: pre;
  overflow-x: auto;
}

/* ---------- safety / hazard ---------- */
.section--hazard { position: relative; }

.hazard-tape {
  height: 14px;
  margin-bottom: 42px;
  background: repeating-linear-gradient(
    -45deg,
    var(--amber) 0 16px,
    #0a0a0a 16px 32px
  );
  opacity: 0.85;
}

.straight {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
  max-width: 860px;
}
.straight li {
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  background: rgba(255, 176, 32, 0.04);
  font-size: 14px;
  color: var(--ink-dim);
}
.straight li strong { color: var(--ink); }
.straight li code { color: var(--cyan); font-size: 12.5px; }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 26px clamp(16px, 4vw, 40px);
  font-size: 13px;
  color: var(--ink-dim);
}
.footer__inner {
  width: min(1160px, 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}
.footer__brand { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); letter-spacing: 0.1em; }
.footer__mark { font-size: 18px; line-height: 1; }
.footer__credit { font-size: 12px; opacity: 0.75; }

/* ---------- reveal on scroll ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(18px) rotate(var(--tilt, 0deg)); transition: opacity 0.5s ease, transform 0.5s ease; }
  .reveal.is-visible { opacity: 1; transform: translateY(0) rotate(var(--tilt, 0deg)); }
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .comic { grid-template-columns: repeat(2, 1fr); }
  .loadout { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .site-header nav a:nth-child(4) { display: none; }
  .comic { grid-template-columns: 1fr; }
  .loadout { grid-template-columns: 1fr; }
  .panel { --tilt: 0deg; transform: none; }
  .hero__content { padding-top: 110px; }
  .install-line { gap: 8px; }
}