/* ==========================================================================
   frederickson.io
   Warm-dark splash over a dusk skyline. No frameworks, no web fonts,
   no third-party requests.
   ========================================================================== */

:root {
  color-scheme: dark;

  /* Surface — warm neutrals, never cold gray */
  --ink-0: #16110e;   /* deepest; page base behind the photo */
  --ink-1: #1f1916;   /* raised surface — link pills */

  /* Text */
  --sand-0: #f7f1ea;  /* primary */
  --sand-1: #cbbfb4;  /* secondary */

  /* Accent — the amber already living in the photograph's horizon.
     Used for exactly three things: the rule, link hover/focus, fireflies. */
  --accent: #f0955a;
  --accent-soft: rgba(240, 149, 90, 0.14);

  --hairline: rgba(247, 241, 234, 0.16);

  /* Rhythm — 4px scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
    Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100svh;
  font-family: var(--sans);
  color: var(--sand-0);
  background-color: var(--ink-0);

  /* Scrim first, photograph second — one paint, no extra elements.
     The stops track the image: dark sky up top, amber horizon at ~70%,
     near-black rooftops below. Each stop buys contrast where text lands. */
  background-image:
    linear-gradient(
      180deg,
      rgba(18, 13, 11, 0.74) 0%,
      rgba(18, 13, 11, 0.5) 26%,
      rgba(18, 13, 11, 0.32) 52%,
      rgba(18, 13, 11, 0.52) 72%,
      rgba(18, 13, 11, 0.9) 100%
    ),
    url(../images/utrecht.jpeg);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  -webkit-font-smoothing: antialiased;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  z-index: 2;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-7);
  padding: clamp(var(--space-5), 5vw, var(--space-8));
  text-align: center;
}

.identity {
  /* Sits in the upper third, over the darkest part of the sky. */
  margin-top: clamp(var(--space-6), 13vh, 9rem);
  max-width: 46rem;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */

.eyebrow {
  margin: 0 0 var(--space-4);
  font-family: var(--mono);
  font-size: clamp(0.7rem, 1.5vw, 0.8rem);
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--sand-1);
  /* Balance half the trailing letter-space so centered text reads centered. */
  text-indent: 0.15em;
}

.name {
  margin: 0;
  font-size: clamp(2.5rem, 9.5vw, 6.5rem);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.035em;
  text-wrap: balance;
  text-shadow: 0 2px 40px rgba(18, 13, 11, 0.6);
}

.rule {
  width: 3.5rem;
  height: 2px;
  margin: var(--space-5) auto;
  border: 0;
  border-radius: 2px;
  background: var(--accent);
}

.tagline {
  margin: 0 auto;
  max-width: 38ch;
  font-size: clamp(1rem, 2.1vw, 1.2rem);
  line-height: 1.6;
  color: var(--sand-1);
  text-wrap: pretty;
}

/* --------------------------------------------------------------------------
   Links
   -------------------------------------------------------------------------- */

.links {
  /* Pushed to the bottom in normal flow — collapses gracefully instead of
     overlapping when the viewport gets short.

     Narrow screens stack the three full-width, the way the old Bootstrap
     `col-12 col-md-4` did. Three pills will not sit on one phone line, and
     letting them wrap gives you a lopsided 2 + 1. */
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  width: 100%;
  max-width: 19rem;
  gap: var(--space-3);
}

@media (min-width: 34rem) {
  .links {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    width: auto;
    max-width: none;
  }
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  min-height: 2.875rem; /* 46px — comfortable touch target */

  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--sand-0);

  background: rgba(31, 25, 22, 0.55);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  backdrop-filter: blur(14px) saturate(1.3);

  transition:
    transform 0.25s var(--ease),
    border-color 0.25s var(--ease),
    background-color 0.25s var(--ease),
    color 0.25s var(--ease);
}

.pill-icon {
  width: 1.125rem;
  height: 1.125rem;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  color: var(--sand-1);
  transition: color 0.25s var(--ease);
}

.pill-label {
  /* Offset the trailing tracking so the label optically centers. */
  margin-right: -0.14em;
}

.pill:hover,
.pill:focus-visible {
  transform: translateY(-2px);
  border-color: var(--accent);
  background-color: var(--accent-soft);
  color: var(--sand-0);
}

.pill:hover .pill-icon,
.pill:focus-visible .pill-icon {
  color: var(--accent);
}

.pill:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.pill:active {
  transform: translateY(0);
}

/* Stacked phone layout — full-width targets, so size them for a thumb. */
@media (max-width: 33.9375rem) {
  .links {
    gap: var(--space-4);
  }

  .pill {
    min-height: 3.5rem;
    padding: var(--space-4) var(--space-5);
    gap: var(--space-4);
    font-size: 0.875rem;
    letter-spacing: 0.16em;
  }

  .pill-icon {
    width: 1.5rem;
    height: 1.5rem;
    stroke-width: 1.6;
  }
}

/* --------------------------------------------------------------------------
   Fireflies — elements are created by js/fireflies.js
   -------------------------------------------------------------------------- */

.fireflies {
  position: fixed;
  inset: 0;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
  contain: layout paint;
}

.firefly {
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 50%;
  background: #fff6ec;
  box-shadow:
    0 0 6px 1px rgba(255, 214, 170, 0.9),
    0 0 16px 4px var(--accent),
    0 0 34px 10px rgba(240, 149, 90, 0.35);
  opacity: 0;
  will-change: transform, opacity;
}

/* --------------------------------------------------------------------------
   Motion preferences
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .pill:hover,
  .pill:focus-visible {
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   Short viewports (landscape phones) — tighten the rhythm, keep the layout
   -------------------------------------------------------------------------- */

@media (max-height: 480px) {
  .hero {
    gap: var(--space-5);
  }

  .identity {
    margin-top: var(--space-4);
  }

  .rule {
    margin-block: var(--space-3);
  }

  .tagline {
    display: none;
  }

  /* No room to stack — a short viewport needs the row back even when narrow. */
  .links {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    width: auto;
    max-width: none;
  }
}

/* --------------------------------------------------------------------------
   404
   -------------------------------------------------------------------------- */

.notfound-code {
  font-family: var(--mono);
  font-size: clamp(0.7rem, 1.5vw, 0.8rem);
  letter-spacing: 0.3em;
  color: var(--accent);
}