/* =====================================================================
   Base — reset, typography, layout, utilities, buttons, effects
   ===================================================================== */

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

* {
  margin: 0;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 80% at 50% -10%, var(--signal-tint-08), transparent 55%),
    radial-gradient(90% 60% at 85% 8%, var(--spark-tint-14), transparent 50%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

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

address {
  font-style: normal;
}

::selection {
  background: var(--spark);
  color: var(--ink-900);
}

/* ---- Focus ---- */
:focus-visible {
  outline: 2px solid var(--signal-bright);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ---- Skip link ---- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1000;
  padding: 0.6rem 1rem;
  background: var(--text);
  color: var(--ink-900);
  border-radius: var(--r-sm);
  font: 600 0.85rem/1 var(--font-body);
  transform: translateY(-150%);
  transition: transform var(--dur) var(--ease-out-expo);
}
.skip-link:focus {
  transform: translateY(0);
}

/* ---- Layout ---- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: var(--space-section);
}

/* ---- Section header ---- */
.section-head {
  max-width: 56rem;
  margin-bottom: clamp(2.5rem, 1.5rem + 3vw, 4.5rem);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 1.2rem;
}
.kicker__idx {
  color: var(--signal-bright);
  position: relative;
  padding-left: 1.5rem;
}
.kicker__idx::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1rem;
  height: 1px;
  background: var(--signal);
  transform: translateY(-50%);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h2);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-display);
}
.section-title .accent {
  font-style: italic;
  background: var(--gradient-signal);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-intro {
  margin-top: 1.75rem;
  max-width: 46rem;
  color: var(--text-muted);
  font-size: var(--fs-lead);
  line-height: 1.45;
}

/* ---- Buttons ---- */
.btn {
  --btn-pad-y: 0.95rem;
  --btn-pad-x: 1.6rem;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: var(--btn-pad-y) var(--btn-pad-x);
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
  isolation: isolate;
  transition: transform var(--dur) var(--ease-out-expo),
    color var(--dur) var(--ease-out-expo),
    border-color var(--dur) var(--ease-out-expo);
  will-change: transform;
}
.btn svg {
  transition: transform var(--dur) var(--ease-out-expo);
}
.btn:hover svg {
  transform: translateX(3px);
}

.btn--primary {
  color: var(--ink-900);
  background: var(--gradient-signal);
  box-shadow: 0 10px 30px -10px var(--signal-tint-22);
}
.btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(115deg, var(--spark-bright), var(--signal-bright));
  opacity: 0;
  z-index: -1;
  transition: opacity var(--dur) var(--ease-out-expo);
}
.btn--primary:hover {
  transform: translateY(-2px);
}
.btn--primary:hover::before {
  opacity: 1;
}

.btn--ghost {
  color: var(--text);
  border: 1px solid var(--line-strong);
  background: oklch(100% 0 0 / 0.02);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover {
  border-color: var(--signal);
  color: var(--signal-bright);
  transform: translateY(-2px);
}

/* ---- Reveal-on-scroll ---- */
.js .reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity var(--dur-slow) var(--ease-out-quart),
    transform var(--dur-slow) var(--ease-out-quart);
  transition-delay: calc(var(--i, 0) * 90ms);
}
.js .reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---- Scroll progress ---- */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: var(--z-progress);
  background: var(--line-faint);
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: var(--gradient-signal);
  box-shadow: 0 0 12px var(--signal-tint-22);
}

/* ---- Grain / atmosphere overlay ---- */
.grain {
  position: fixed;
  inset: 0;
  z-index: var(--z-grain);
  pointer-events: none;
  opacity: 0.4;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- Custom cursor (pointer:fine only) ---- */
.cursor {
  display: none;
}
@media (hover: hover) and (pointer: fine) {
  .cursor {
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-cursor);
    pointer-events: none;
    display: block;
    mix-blend-mode: difference;
  }
  .cursor__dot {
    position: fixed;
    top: 0;
    left: 0;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #fff;
    transform: translate(-50%, -50%);
  }
  .cursor__ring {
    position: fixed;
    top: 0;
    left: 0;
    width: 34px;
    height: 34px;
    border: 1px solid oklch(100% 0 0 / 0.55);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width var(--dur) var(--ease-out-expo),
      height var(--dur) var(--ease-out-expo),
      border-color var(--dur) var(--ease-out-expo);
  }
  .cursor.is-hover .cursor__ring {
    width: 56px;
    height: 56px;
    border-color: var(--signal-bright);
  }
  .cursor.is-down .cursor__ring {
    width: 26px;
    height: 26px;
  }
  /* hide native cursor on interactive bits when custom is active */
  body.has-cursor,
  body.has-cursor a,
  body.has-cursor button,
  body.has-cursor input,
  body.has-cursor textarea {
    cursor: none;
  }
}

/* ---- Utility ---- */
.tick {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal-bright);
  box-shadow: 0 0 10px var(--signal);
  animation: pulse 2.4s var(--ease-out-expo) infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.7); }
}
@media (prefers-reduced-motion: reduce) {
  .tick { animation: none; }
}