/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--void);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

body.no-scroll { overflow: hidden; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul { list-style: none; }
svg { display: block; }

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--sp-4);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-2);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.7;
}

.section-title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin-bottom: var(--sp-2);
}

.section-sub {
  color: var(--ink-dim);
  font-size: 1.05rem;
  max-width: 560px;
  margin-bottom: var(--sp-5);
}

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

section {
  position: relative;
  padding: var(--sp-7) 0;
}

/* Focus visibility (accessibility) */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Glass surface utility */
.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.glass-border-gradient {
  position: relative;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--deep), var(--deep)) padding-box,
    var(--grad-primary) border-box;
}

/* Reveal-on-scroll base state */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-scale {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal-scale.is-visible {
  opacity: 1;
  transform: scale(1);
}
.stagger > * {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.stagger.is-visible > * { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-scale, .stagger > * {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -60px;
  left: var(--sp-3);
  background: var(--violet);
  color: #fff;
  padding: 0.7rem 1.2rem;
  border-radius: var(--r-sm);
  z-index: 999;
  transition: top var(--dur-fast);
}
.skip-link:focus { top: var(--sp-3); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.9rem 1.7rem;
  border-radius: var(--r-full);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  position: relative;
  transition: transform var(--dur-fast) var(--ease-soft);
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--grad-primary);
  color: #06050f;
}
.btn-primary:hover { transform: translateY(-2px); }

.btn-ghost {
  background: var(--surface);
  border: 1px solid var(--border-hi);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--surface-hi); border-color: var(--violet-2); }

.btn-icon {
  width: 1.1em;
  height: 1.1em;
  flex-shrink: 0;
}

/* Tag pill */
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.7rem;
  border-radius: var(--r-full);
  border: 1px solid var(--border-hi);
  color: var(--ink-dim);
}

/* Visually hidden */
.vh {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}