/*
 * ═══════════════════════════════════════════════════════════
 * PREMIUM BACKGROUND SYSTEM — Site Pierre
 * ═══════════════════════════════════════════════════════════
 *
 * ONE unified dark surface across the entire page.
 * Layers (bottom → top):
 *   1. Base: deep black (#050505)
 *   2. Gradient nebulae: dark blue / navy / purple hints
 *   3. Grain texture: anti-flat noise
 *   4. SVG wave mesh: thin animated flowing lines
 *   5. Content (sits above via normal stacking)
 *
 * Performance: pure CSS + lightweight inline SVG.
 * No external assets. No JS required.
 */

/* ─── 1. FORCE DARK PALETTE ─────────────────────────────── */

:root {
  --c-black: #e0e0e0;
  --c-white: #080808;
  --c-gray-100: #0d0d0e;
  --c-gray-200: rgba(255, 255, 255, 0.06);
  --c-gray-400: #555555;
  --c-gray-600: #8a8a8a;
  --c-ink-fixed: #050505;

  --border: 1px solid rgba(255, 255, 255, 0.05);

  color-scheme: dark;
}

/* Cancel the light-mode media query — we are always dark */
@media (prefers-color-scheme: dark) {
  :root {
    --c-black: #e0e0e0;
    --c-white: #080808;
    --c-gray-100: #0d0d0e;
    --c-gray-200: rgba(255, 255, 255, 0.06);
    --c-gray-400: #555555;
    --c-gray-600: #8a8a8a;
  }
}

/* ─── 2. BASE SURFACE ────────────────────────────────────── */

html {
  background: #050505;
}

body {
  background: transparent;
}

/* ─── 3. BACKGROUND SYSTEM CONTAINER ─────────────────────── */

.bg-system {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

/* Gradient nebulae — visible dark blue / purple atmosphere */
.bg-system::before {
  content: "";
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(
      ellipse 90% 65% at 8% 12%,
      rgba(16, 0, 65, 0.7),
      transparent 65%
    ),
    radial-gradient(
      ellipse 70% 55% at 92% 75%,
      rgba(20, 5, 72, 0.55),
      transparent 60%
    ),
    radial-gradient(
      ellipse 50% 40% at 50% 45%,
      rgba(10, 3, 45, 0.35),
      transparent 55%
    ),
    radial-gradient(
      ellipse 60% 35% at 70% 20%,
      rgba(8, 0, 55, 0.3),
      transparent 50%
    );
  animation: bg-nebula 18s ease-in-out infinite alternate;
  will-change: transform;
}

/* Grain texture — fractal noise overlay */
.bg-system::after {
  content: "";
  position: absolute;
  inset: -5%;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ─── 4. SVG WAVE LINES ──────────────────────────────────── */

.bg-waves {
  position: absolute;
  fill: none;
  stroke-linecap: round;
  will-change: transform;
}

/* Top-left cluster */
.bg-waves--tl {
  top: -5%;
  left: -10%;
  width: 85vw;
  max-width: 1100px;
  height: auto;
  animation: bg-drift-tl 16s ease-in-out infinite alternate;
}

/* Bottom-right cluster */
.bg-waves--br {
  bottom: -5%;
  right: -6%;
  width: 75vw;
  max-width: 1000px;
  height: auto;
  animation: bg-drift-br 14s ease-in-out infinite alternate;
}

/* ─── 5. KEYFRAMES ───────────────────────────────────────── */

@keyframes bg-nebula {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(20px, 12px) scale(1.04); }
  100% { transform: translate(-10px, 8px) scale(1.02); }
}

@keyframes bg-drift-tl {
  0%   { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(40px, 25px) rotate(1.2deg); }
}

@keyframes bg-drift-br {
  0%   { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-35px, -20px) rotate(-0.8deg); }
}

/* ─── 6. REDUCED MOTION ──────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .bg-system::before,
  .bg-waves--tl,
  .bg-waves--br {
    animation: none;
  }
}

/* ─── 7. COMPONENT OVERRIDES ─────────────────────────────── */

/* Kill all borders — one unified surface, no breaks */
.section,
.footer,
.contact__right {
  border-top: none;
}

header.nav {
  border-bottom: none;
}

/* Nav — translucent dark glass */
header.nav {
  background: rgba(5, 5, 5, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: rgba(255, 255, 255, 0.04);
}

header.nav.scrolled {
  background: rgba(5, 5, 5, 0.88);
}

/* Cancel the nav scrolled dark-mode override */
@media (prefers-color-scheme: dark) {
  header.nav.scrolled {
    background: rgba(5, 5, 5, 0.88);
  }
}

/* Mobile nav panel */
.nav__panel {
  background: #080808;
}

/* About + Projects — transparent so unified bg shows through */
.about,
.projects--index {
  background: transparent;
}

.projects--index {
  border-top-color: transparent;
}

/* Hide about grain overlay — global bg-system handles grain */
.about__grain-layer {
  display: none;
}

/* About sub-elements — match unified bg */
.about__badge-v2 span {
  background: rgba(255, 255, 255, 0.1);
  color: var(--c-white-fixed);
}

.about__visual-v2 {
  background: rgba(255, 255, 255, 0.04);
}

.about__avatar {
  background: rgba(255, 255, 255, 0.06);
  border-color: transparent;
}

/* Expertise section — transparent, unified surface */
.expertise {
  background: transparent;
}

/* Expertise tag pills (were hardcoded white bg) */
.expertise__card .tag {
  background: rgba(255, 255, 255, 0.06);
}

/* Hero backline — always use screen blend for dark bg */
.hero__backline {
  color: rgba(255, 255, 255, 0.06);
  mix-blend-mode: screen;
}

/* Selection */
::selection {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}

/* Focus ring */
:focus-visible {
  outline-color: rgba(255, 255, 255, 0.5);
}