/* ============================================
   pococo — base styles
   Reset, typography defaults, primitives
   ============================================ */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-main);
  background-color: var(--bg-main);
  overflow-x: hidden;
  transition: background-color var(--d-slow) var(--ease-inout),
              color var(--d-slow) var(--ease-inout);
}

/* Links default to the section accent — never browser blue/purple (#18).
   Components (buttons, nav, footer, CTAs) set their own colour and win. */
a { color: var(--primary-text); }

/* ---- Grain overlay (fixed, subtle) ---- */
.grain {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.025;
  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='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  mix-blend-mode: multiply;
}
[data-theme="dark"] .grain {
  opacity: 0.04;
  mix-blend-mode: screen;
}

/* ---- Parallax atmospheric layers ---- */
.atmos {
  position: fixed;
  inset: -10% 0 -10% 0;
  pointer-events: none;
  z-index: 0;
  will-change: transform;
  transition: opacity var(--d-slow);
}
.atmos--slow {
  opacity: 0.5;
  background:
    radial-gradient(ellipse at 20% 10%,
      color-mix(in srgb, var(--primary) 7%, transparent) 0%,
      transparent 50%),
    radial-gradient(ellipse at 80% 70%,
      color-mix(in srgb, var(--primary) 5%, transparent) 0%,
      transparent 55%);
  filter: blur(60px);
}
.atmos--noise {
  opacity: 0.018;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.5' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 400px 400px;
}
[data-theme="dark"] .atmos--noise { opacity: 0.06; }
/* Soft light glow from --primary needs more presence on dark surfaces. */
[data-theme="dark"] .atmos--slow {
  opacity: 0.65;
  background:
    radial-gradient(ellipse at 20% 10%,
      color-mix(in srgb, var(--primary) 11%, transparent) 0%,
      transparent 50%),
    radial-gradient(ellipse at 80% 70%,
      color-mix(in srgb, var(--primary) 8%, transparent) 0%,
      transparent 55%);
}

[data-motion="off"] .atmos { display: none; }

/* ---- Containers ---- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--sp-8);
}
.container--narrow { max-width: var(--container-narrow); }

/* ---- Section ---- */
.section {
  position: relative;
  z-index: 1;
  padding: var(--section-pad) 0;
  transition: background-color 600ms var(--ease-inout);
  background-color: var(--bg-main);
}

/* ---- Typography primitives ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--primary-text);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
}
.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--primary);
}

.h-display {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(40px, 5.5vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--text-main);
  font-optical-sizing: auto;
  text-wrap: balance;
}

.h-section {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 4.5vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--text-main);
  font-optical-sizing: auto;
  text-wrap: balance;
}

.h-jp {
  font-family: var(--font-jp-serif);
  font-weight: 400;
  font-size: clamp(15px, 1.7vw, 19px);
  line-height: 1.85;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.lede {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 60ch;
  text-wrap: pretty;
}

/* ---- Card primitive ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: var(--sp-8);
  transition: transform var(--d-slow) var(--ease-out),
              box-shadow var(--d-slow) var(--ease-out),
              border-color var(--d-base),
              background-color var(--d-slow);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--d-base) var(--ease-out);
}
.card:hover::before { transform: scaleX(1); }
.card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--primary) 22%, var(--hairline));
  box-shadow: 0 14px 40px color-mix(in srgb, var(--primary) 8%, transparent);
}
[data-theme="dark"] .card:hover {
  border-color: color-mix(in srgb, var(--primary) 38%, var(--hairline));
  box-shadow:
    0 14px 40px color-mix(in srgb, var(--primary) 22%, transparent),
    0 0 0 1px color-mix(in srgb, var(--primary) 20%, transparent);
}
[data-motion="off"] .card:hover { transform: none; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4) var(--sp-6);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--d-fast) var(--spring),
              background-color var(--d-base),
              color var(--d-base),
              border-color var(--d-base);
  text-decoration: none;
}
.btn--primary {
  background: var(--primary);
  color: var(--base-bg);
}
.btn--primary:hover { transform: translateY(-1px); filter: brightness(1.08); }
.btn--primary:active { transform: translateY(0) scale(0.98); }

/* Ghost buttons carry a real surface so they read as buttons, not
   see-through text (#6). */
.btn--ghost {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: color-mix(in srgb, var(--primary) 30%, var(--hairline));
}
.btn--ghost:hover {
  border-color: var(--primary);
  color: var(--primary-text);
  background: color-mix(in srgb, var(--primary) 6%, var(--bg-card));
}

.btn__arrow {
  display: inline-block;
  transition: transform var(--d-base) var(--ease-out);
}
.btn:hover .btn__arrow { transform: translateX(4px); }

/* ---- Reveal animations ----
   Progressive enhancement: only hide reveals when JS is active and ready
   (root.js-reveal). If JS fails or animations are throttled, reveals
   default to visible. */
@keyframes reveal-up {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.js-reveal .reveal {
  opacity: 0;
  transform: translateY(20px);
}
.js-reveal .reveal.is-visible {
  animation: reveal-up 800ms var(--ease-out) forwards;
}
[data-motion="off"] .reveal { opacity: 1 !important; transform: none !important; animation: none !important; }

.reveal-d1.is-visible { animation-delay: 80ms; }
.reveal-d2.is-visible { animation-delay: 160ms; }
.reveal-d3.is-visible { animation-delay: 240ms; }
.reveal-d4.is-visible { animation-delay: 320ms; }
.reveal-d5.is-visible { animation-delay: 400ms; }

/* ---- Focus rings ---- */
:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Skip link ----
   First focusable element on every page. Invisible until tabbed to, so it
   costs the design nothing and saves keyboard users the whole nav. */
.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translate(-50%, -120%);
  z-index: 1000;
  padding: 12px 20px;
  background: var(--primary);
  color: var(--base-bg);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: transform var(--d-base) var(--ease-out);
}
.skip-link:focus-visible { transform: translate(-50%, 0); }

/* Sections are the anchor targets; the nav floats over them. */
main:focus { outline: none; }

/* ---- Density modifier ---- */
[data-density="compact"] {
  --section-pad: var(--sp-16);
  --sp-base-scale: 0.85;
}
[data-density="spacious"] {
  --section-pad: var(--sp-32);
}