/* =========================================================
   ISAAC — shared theme
   One source of truth for color, type, and motion across pages.
   Edit a variable here and every page updates.
   ========================================================= */

:root {
  /* Color */
  --void: #08070f;
  --void-2: #0b0a16;
  --surface: #100e1f;
  --surface-2: #15132a;
  --line: rgba(255, 255, 255, 0.09);
  --line-2: rgba(255, 255, 255, 0.16);

  --violet: #8b5cf6;
  --violet-deep: #6d28d9;
  --cyan: #22d3ee;
  --ember: #ff6b35;
  --ember-soft: #ff8a5c;
  --lime: #34d399; /* used inside the coding sim only */

  --white: #ffffff;
  --mute: #b8b5d6;
  --mute-2: #807d9e;

  /* Signature gradients */
  --grad-cool: linear-gradient(135deg, var(--violet), var(--cyan));
  --grad-hot: linear-gradient(135deg, var(--ember), #ffb05c);
  --grad-iris: linear-gradient(120deg, #b388ff 0%, var(--violet) 35%, #4f7dff 70%, var(--cyan) 100%);

  /* Type */
  --display: "Sora", system-ui, sans-serif;
  --body: "Inter", system-ui, sans-serif;
  --mono: "Space Mono", "Courier New", monospace;

  /* Shape + depth */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;
  --shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.7);
  --glow-violet: 0 0 40px -6px rgba(139, 92, 246, 0.55);
  --glow-cyan: 0 0 40px -6px rgba(34, 211, 238, 0.5);
  --glow-ember: 0 0 40px -6px rgba(255, 107, 53, 0.55);

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  --wrap: 1160px;
}

/* ---------- Reset / base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--void);
  color: var(--mute);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  min-height: 100vh;
  animation: pageIn 0.7s var(--ease) both;
}

@keyframes pageIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--display);
  color: var(--white);
  line-height: 1.04;
  letter-spacing: -0.03em;
  margin: 0;
  font-weight: 800;
}

p {
  margin: 0;
}

::selection {
  background: var(--violet);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- Ambient background (pure CSS, on every page) ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  background:
    radial-gradient(900px 600px at 82% -5%, rgba(139, 92, 246, 0.16), transparent 60%),
    radial-gradient(800px 600px at 6% 12%, rgba(34, 211, 238, 0.12), transparent 55%),
    radial-gradient(700px 700px at 50% 115%, rgba(255, 107, 53, 0.1), transparent 60%),
    var(--void);
}

.bg::after {
  /* faint blueprint grid */
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 30%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 100% 80% at 50% 30%, #000 40%, transparent 100%);
}

.orb {
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.5;
  pointer-events: none;
  will-change: transform;
}
.orb-1 {
  width: 420px;
  height: 420px;
  top: -120px;
  right: -80px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.7), transparent 70%);
}
.orb-2 {
  width: 360px;
  height: 360px;
  bottom: -120px;
  left: -90px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.55), transparent 70%);
}
.orb-3 {
  width: 300px;
  height: 300px;
  top: 40%;
  left: 60%;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.4), transparent 70%);
}

/* ---------- Layout helpers ---------- */
.wrap {
  width: min(var(--wrap), 92vw);
  margin-inline: auto;
}

.section {
  padding-block: clamp(64px, 11vw, 130px);
  position: relative;
}

.eyebrow {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.32em;
  font-size: 12px;
  font-weight: 700;
  color: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--cyan);
  display: inline-block;
}

.grad {
  background: var(--grad-iris);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.grad-hot {
  background: var(--grad-hot);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--mute);
  max-width: 56ch;
}

/* ---------- Navbar ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(8, 7, 15, 0.85), rgba(8, 7, 15, 0.5));
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  width: min(var(--wrap), 92vw);
  margin-inline: auto;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: #fff;
  display: inline-flex;
  align-items: center;
  gap: 11px;
}
.brand .mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--grad-iris);
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 14px;
  color: #0a0a14;
  box-shadow: var(--glow-violet);
}
.brand .dot {
  color: var(--ember);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.nav-link {
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--mute);
  transition: color 0.25s, background 0.25s;
  position: relative;
}
.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}
.nav-link.active {
  color: #fff;
}
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-cool);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-2);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 12px;
  cursor: pointer;
  padding: 0;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 2px;
  background: #fff;
  left: 50%;
  transform: translateX(-50%);
  transition: 0.3s var(--ease);
}
.nav-toggle span {
  top: 50%;
  margin-top: -1px;
}
.nav-toggle span::before {
  top: -6px;
}
.nav-toggle span::after {
  top: 6px;
}
.nav.open .nav-toggle span {
  background: transparent;
}
.nav.open .nav-toggle span::before {
  top: 0;
  transform: translateX(-50%) rotate(45deg);
}
.nav.open .nav-toggle span::after {
  top: 0;
  transform: translateX(-50%) rotate(-45deg);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: 999px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.03em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, background 0.25s, border-color 0.25s;
  white-space: nowrap;
}
.btn:active {
  transform: translateY(1px) scale(0.99);
}
.btn-primary {
  background: var(--grad-hot);
  color: #1a0a02;
  box-shadow: var(--glow-ember);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px -4px rgba(255, 107, 53, 0.7);
}
.btn-cool {
  background: var(--grad-cool);
  color: #06121a;
  box-shadow: var(--glow-cyan);
}
.btn-cool:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px -4px rgba(34, 211, 238, 0.7);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--line-2);
  color: #fff;
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--violet);
  transform: translateY(-2px);
}
.btn .arrow {
  transition: transform 0.25s var(--ease);
}
.btn:hover .arrow {
  transform: translateX(4px);
}

/* ---------- Chips (HUD) ---------- */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.chip {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  padding: 8px 13px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: rgba(255, 255, 255, 0.03);
  color: var(--mute);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.chip b {
  color: #fff;
  font-weight: 700;
}
.chip .led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}
.chip .led.v {
  background: var(--violet);
  box-shadow: 0 0 8px var(--violet);
}
.chip .led.e {
  background: var(--ember);
  box-shadow: 0 0 8px var(--ember);
}

/* ---------- Card base ---------- */
.card {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px;
  position: relative;
  overflow: hidden;
}

/* ---------- Section heading block ---------- */
.head {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 46px;
}
.head h2 {
  font-size: clamp(2rem, 4.6vw, 3.4rem);
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: transform, opacity;
}
.reveal.in {
  opacity: 1;
  transform: none;
}
.reveal[data-d="1"] { transition-delay: 0.08s; }
.reveal[data-d="2"] { transition-delay: 0.16s; }
.reveal[data-d="3"] { transition-delay: 0.24s; }
.reveal[data-d="4"] { transition-delay: 0.32s; }
.reveal[data-d="5"] { transition-delay: 0.4s; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding-block: 48px 40px;
  margin-top: 40px;
}
.footer-inner {
  width: min(var(--wrap), 92vw);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  align-items: center;
  justify-content: space-between;
}
.footer .brand {
  font-size: 1.05rem;
}
.footer small {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--mute-2);
  letter-spacing: 0.04em;
}
.footer .mini-links {
  display: flex;
  gap: 18px;
  font-family: var(--mono);
  font-size: 12px;
}
.footer .mini-links a {
  color: var(--mute);
  transition: color 0.2s;
}
.footer .mini-links a:hover {
  color: var(--cyan);
}

/* ---------- Page transition overlay (level load) ---------- */
.transition {
  position: fixed;
  inset: 0;
  z-index: 999;
  pointer-events: none;
  display: grid;
  place-items: center;
  transform: translateY(-100%);
}
.transition.show {
  transform: translateY(0);
  pointer-events: all;
}
.transition .sheet {
  position: absolute;
  inset: 0;
  background: var(--grad-iris);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.45s var(--ease-in-out);
}
.transition.show .sheet {
  transform: scaleY(1);
}
.transition .load-text {
  position: relative;
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: 0.3em;
  color: #0a0a14;
  font-size: 14px;
  opacity: 0;
  transition: opacity 0.2s ease 0.2s;
}
.transition.show .load-text {
  opacity: 1;
}
.transition .load-text .dots::after {
  content: "";
  animation: dots 0.9s steps(4, end) infinite;
}
@keyframes dots {
  0% { content: ""; }
  25% { content: "."; }
  50% { content: ".."; }
  75% { content: "..."; }
}

/* ---------- Game shell (shared by game pages) ---------- */
.game-stage {
  width: min(var(--wrap), 94vw);
  margin: 18px auto 0;
}
.game-frame {
  position: relative;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-2);
  background: radial-gradient(120% 140% at 50% 0%, #14122a 0%, #0a0913 70%);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.game-frame canvas {
  display: block;
  width: 100%;
  height: auto;
  touch-action: none;
}
.hud-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--mono);
}
.stat {
  display: flex;
  align-items: baseline;
  gap: 9px;
}
.stat .k {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute-2);
}
.stat .v {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  min-width: 1.5ch;
}
.stat .v.cyan { color: var(--cyan); }
.stat .v.ember { color: var(--ember); }
.stat .v.violet { color: var(--violet); }

.pill-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.pill {
  font-family: var(--mono);
  font-size: 12px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: rgba(255, 255, 255, 0.03);
  color: var(--mute);
  cursor: pointer;
  transition: all 0.2s var(--ease);
  user-select: none;
}
.pill:hover {
  color: #fff;
  border-color: var(--violet);
}
.pill.on {
  background: var(--grad-cool);
  color: #06121a;
  border-color: transparent;
}

.game-tip {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--mute-2);
  text-align: center;
  margin-top: 16px;
}
.game-tip b { color: var(--mute); }
kbd {
  font-family: var(--mono);
  font-size: 11px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 2px 7px;
  color: #fff;
}

/* overlay shown over a game canvas (start / game over) */
.canvas-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
  background: rgba(8, 7, 15, 0.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 5;
  transition: opacity 0.3s ease;
}
.canvas-overlay.hide {
  opacity: 0;
  pointer-events: none;
}
.canvas-overlay h3 {
  font-size: clamp(1.8rem, 5vw, 3rem);
  margin-bottom: 10px;
}
.canvas-overlay p {
  color: var(--mute);
  margin-bottom: 22px;
  font-family: var(--mono);
  font-size: 13px;
}

/* ---------- Back-to-arcade link ---------- */
.backlink {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--mute);
  transition: color 0.2s, gap 0.2s;
}
.backlink:hover {
  color: var(--cyan);
  gap: 12px;
}

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .nav-toggle {
    display: block;
  }
  .nav-links {
    position: fixed;
    inset: 68px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 18px 6vw 26px;
    background: rgba(10, 9, 20, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }
  .nav.open .nav-links {
    opacity: 1;
    transform: none;
    pointer-events: all;
  }
  .nav-link {
    padding: 13px 14px;
    font-size: 15px;
  }
  .nav-link.active::after {
    display: none;
  }
}

/* ---------- 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;
  }
  body {
    animation: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  .orb {
    display: none;
  }
}