/* ==========================================================================
   GLOBAL — Base styles, layout utilities, shared patterns
   ========================================================================== */

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  transition: background-color var(--duration-slow) var(--ease-out-expo),
              color var(--duration-slow) var(--ease-out-expo);
}

body.is-loading {
  overflow: hidden;
}

body.custom-cursor-active {
  cursor: none;
}

body.custom-cursor-active a,
body.custom-cursor-active button {
  cursor: none;
}

/* Selection */
::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

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

/* Section base */
.section {
  position: relative;
  padding-block: var(--section-padding);
}

.section__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.section__label::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--color-accent);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-top: var(--space-sm);
  line-height: 1.6;
}

/* Gradient text */
.gradient-text {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Glass card */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
}

/* Noise overlay — isolated onto its own GPU layer so it paints once */
.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: var(--z-base);
  opacity: var(--noise-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 160px 160px;
  transform: translateZ(0);
  will-change: transform;
  contain: strict;
}

/* Mouse spotlight — positioned at top/left 0 and moved via GPU transform */
.spotlight {
  position: fixed;
  top: 0;
  left: 0;
  width: 500px;
  height: 500px;
  margin: -250px 0 0 -250px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--spotlight-color) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  will-change: transform;
  transition: opacity 0.4s ease;
}

.spotlight.is-active {
  opacity: 1;
}

/* Animated grid background */
.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 70%);
  opacity: 0.4;
  pointer-events: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 1rem 2rem;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--radius-full);
  transition: transform var(--duration-fast) var(--ease-out-expo),
              box-shadow var(--duration-fast) var(--ease-out-expo),
              background var(--duration-fast) ease,
              color var(--duration-fast) ease;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 80px var(--color-accent-glow);
}

.btn--secondary {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn--secondary:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

.btn--ghost {
  padding: 0.75rem 1.5rem;
  color: var(--color-text-muted);
  border: 1px solid transparent;
}

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

/* Magnetic wrapper */
.magnetic-wrap {
  display: inline-block;
}

/* Visually hidden (accessibility) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  z-index: 10000;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-sm);
}

/* Scroll progress bar */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
  z-index: calc(var(--z-sticky) + 1);
  transform-origin: left;
}

/* Scroll to top */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--card-solid);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--duration-normal) ease,
              visibility var(--duration-normal) ease,
              transform var(--duration-normal) var(--ease-out-expo);
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top svg {
  width: 20px;
  height: 20px;
  fill: var(--color-accent);
  transition: transform 0.3s var(--ease-out-expo);
}

.scroll-top:hover svg {
  transform: translateY(-4px);
}

/* Social dock */
.social-dock {
  position: fixed;
  left: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: var(--z-dropdown);
}

.social-dock__link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--card-solid);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: color var(--duration-fast) ease,
              border-color var(--duration-fast) ease,
              transform var(--duration-fast) var(--ease-out-expo);
}

.social-dock__link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: scale(1.1);
}

.social-dock__link svg {
  width: 18px;
  height: 18px;
}

/* Scroll percentage circle */
.scroll-indicator {
  position: fixed;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  z-index: var(--z-dropdown);
}

.scroll-indicator svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.scroll-indicator__bg {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 2;
}

.scroll-indicator__progress {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 126;
  stroke-dashoffset: 126;
  transition: stroke-dashoffset 0.1s linear;
}

.scroll-indicator__text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-text-muted);
}

/* Page wrapper */
.page-wrapper {
  position: relative;
  z-index: 2;
}

/* Reveal animation initial state */
.reveal-up {
  opacity: 0;
  transform: translateY(40px);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
}

/* Line decoration */
.line-accent {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: var(--radius-full);
}