/* Shared primitives reused across every component — avoids per-section duplication. */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section {
  padding-block: var(--space-8);
  position: relative;
}

.section-heading {
  max-width: 640px;
  margin-bottom: var(--space-7);
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-cyan);
  margin-bottom: var(--space-3);
}

.section-eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--gradient-cyan);
  border-radius: var(--radius-full);
}

.section-title {
  font-size: var(--text-3xl);
  letter-spacing: -0.02em;
}

.section-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--text-lg);
  margin-top: var(--space-3);
  line-height: var(--leading-relaxed);
}

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

.gradient-text-animated {
  background: linear-gradient(
    90deg,
    var(--color-accent),
    var(--color-accent-cyan),
    var(--color-accent-purple),
    var(--color-accent)
  );
  background-size: 300% auto;
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  animation: gradient-shift 6s linear infinite;
}

/* Glass surface — the site's signature card treatment */
.glass {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
  transition: border-color var(--duration-base) var(--ease-out-expo),
    box-shadow var(--duration-base) var(--ease-out-expo),
    transform var(--duration-base) var(--ease-out-expo),
    background var(--duration-base) var(--ease-out-expo);
}

.glass-interactive:hover,
.glass-interactive:focus-within {
  border-color: var(--color-border-strong);
  background: var(--color-surface-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

/* Buttons */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-base) var(--ease-out-expo),
    border-color var(--duration-base) var(--ease-out-expo),
    background var(--duration-base) var(--ease-out-expo);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 8px 24px -8px rgba(79, 140, 255, 0.55);
}

.btn-primary:hover {
  box-shadow: 0 12px 32px -6px rgba(79, 140, 255, 0.7);
}

.btn-secondary {
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-accent);
}

.btn-ghost {
  color: var(--color-text-secondary);
  padding-inline: var(--space-3);
}

.btn-ghost:hover {
  color: var(--color-text);
}

/* Button shine sweep */
.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    transparent,
    rgba(255, 255, 255, 0.35),
    transparent
  );
  transform: translateX(-120%) skewX(-15deg);
  pointer-events: none;
}

.btn:hover::after {
  animation: button-shine 900ms var(--ease-out-expo);
}

/* Ripple (click feedback) — dot positioned via JS custom properties --ripple-x/--ripple-y */
.ripple::before {
  content: "";
  position: absolute;
  left: var(--ripple-x, 50%);
  top: var(--ripple-y, 50%);
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  opacity: 0;
  pointer-events: none;
}

.ripple.is-rippling::before {
  animation: ripple-out 550ms var(--ease-out-expo);
}

/* Chips / tags */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* Animated underline (nav links, inline links) */
.underline-link {
  position: relative;
}

.underline-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration-base) var(--ease-out-expo);
}

.underline-link:hover::after,
.underline-link.is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Card glow-on-hover accent */
.glow-card {
  position: relative;
}

.glow-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: var(--gradient-primary);
  opacity: 0;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  transition: opacity var(--duration-base) var(--ease-out-expo);
  pointer-events: none;
}

.glow-card:hover::before,
.glow-card:focus-within::before {
  opacity: 1;
}

/* Tilt wrapper — perspective for src/animations/interactions.js */
.tilt {
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform var(--duration-fast) var(--ease-out-expo);
}

/* Magnetic buttons */
.magnetic {
  will-change: transform;
  transition: transform var(--duration-fast) var(--ease-spring);
}

@media (max-width: 720px) {
  .section {
    padding-block: var(--space-7);
  }
}

/* Cursor glow — appended by src/animations/interactions.js on fine-pointer devices */
.cursor-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(79, 140, 255, 0.16),
    rgba(123, 97, 255, 0.08) 45%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 1;
  will-change: transform;
  transition: opacity var(--duration-base) var(--ease-out-expo);
}

.cursor-glow.is-active {
  background: radial-gradient(
    circle,
    rgba(0, 212, 255, 0.22),
    rgba(79, 140, 255, 0.1) 45%,
    transparent 70%
  );
}