:root {
  --bg: #f1f3f7;
  --bg-soft: #e6eaf1;
  --card: #f9fafc;
  --text: #1f2a3a;
  --muted: #55627a;
  --accent: #3d5f9a;      /* calm blue, AA on --bg */
  --accent-ink: #f1f3f7;
  --line: #d3d9e4;
  --glow: rgba(110, 140, 200, .22);
  --radius: 18px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12171f;
    --bg-soft: #1a212c;
    --card: #19202a;
    --text: #e3e9f2;
    --muted: #a2aec2;
    --accent: #9db8ee;
    --accent-ink: #101826;
    --line: #2b3646;
    --glow: rgba(110, 150, 220, .13);
  }
}

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

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

body {
  margin: 0;
  font: 1.0625rem/1.65 var(--font);
  color: var(--text);
  background:
    radial-gradient(60rem 30rem at 85% -10%, var(--glow), transparent 70%),
    radial-gradient(45rem 25rem at -10% 30%, var(--glow), transparent 70%),
    var(--bg);
  background-attachment: fixed;
}

.wrap { width: min(100% - 2rem, 46rem); margin-inline: auto; }

section { padding-block: 2.5rem; }

h1, h2, h3 { line-height: 1.15; margin: 0; }
h1 { font-size: clamp(2.4rem, 8vw, 4rem); letter-spacing: -.03em; }
h2 { font-size: 1.6rem; letter-spacing: -.01em; margin-bottom: 1.25rem; }
h3 { font-size: 1.05rem; margin-bottom: .4rem; }
p { margin: 0 0 1rem; }

a { color: var(--accent); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip {
  position: absolute; left: 1rem; top: -4rem;
  background: var(--accent); color: var(--accent-ink);
  padding: .6rem 1rem; border-radius: 8px; z-index: 10;
}
.skip:focus { top: 1rem; }

/* header */
.top {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1rem; padding-block: 1.5rem;
}

.wordmark {
  font: 700 1.5rem/1 var(--mono);
  letter-spacing: -.02em;
  color: var(--text);
  background: none; border: 0; padding: .4rem .5rem; margin-left: -.5rem;
  cursor: pointer; border-radius: 10px;
}
.wordmark .n {
  display: inline-block;
  color: var(--accent);
  transition: transform .7s cubic-bezier(.34, 1.56, .64, 1);
}
.wordmark[aria-pressed="true"] .n { transform: rotate(180deg); }
@media (hover: hover) {
  .wordmark:hover .n { transform: rotate(180deg); }
  .wordmark[aria-pressed="true"]:hover .n { transform: none; }
}

.status {
  margin: 0; font-size: .9rem; color: var(--muted);
  display: inline-flex; align-items: center; gap: .5rem;
}
.dot { width: .55rem; height: .55rem; border-radius: 50%; background: var(--accent); }

/* language / reading-level switcher */
.lang { flex-basis: 100%; }
.lang-list { margin: 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.lang a {
  display: inline-block; padding: .35rem .85rem; border-radius: 999px;
  border: 1px solid var(--line); background: var(--card);
  color: var(--text); font-size: .9rem; text-decoration: none;
}
.lang a:hover { border-color: var(--accent); }
.lang a[aria-current="page"] {
  background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 650;
}

/* easy-reading pages: bigger text, calmer rhythm, one idea per line */
.easy { font-size: 1.1875rem; line-height: 1.85; }
.easy p { max-width: 34rem; }
.easy .lead { font-size: 1.3rem; }

/* hero */
.hero { padding-top: 3rem; padding-bottom: 3rem; }

.wave {
  display: inline-block;
  margin-left: .25em;
  transform-origin: 70% 80%;
  animation: wave 2.6s ease-in-out 3 .4s;
}
@keyframes wave {
  0%, 60%, 100% { transform: rotate(0); }
  10% { transform: rotate(16deg); }
  20% { transform: rotate(-10deg); }
  30% { transform: rotate(16deg); }
  40% { transform: rotate(-6deg); }
  50% { transform: rotate(10deg); }
}
.wave:hover { animation: wave 1.6s ease-in-out infinite; }

.lead { font-size: 1.25rem; max-width: 36rem; margin-top: 1.5rem; }
.lead strong { color: var(--accent); font-weight: 650; }


.cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.btn {
  display: inline-block; padding: .75rem 1.3rem; border-radius: 999px;
  background: var(--accent); color: var(--accent-ink);
  font-weight: 650; text-decoration: none;
  border: 2px solid var(--accent);
  transition: transform .2s ease, background-color .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn.ghost { background: transparent; color: var(--accent); }

/* about */
#about p { max-width: 38rem; }
.interests-h {
  color: var(--muted); font-size: .85rem; text-transform: uppercase;
  letter-spacing: .08em; margin-top: 1.75rem;
}

/* cards */
.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }
@media (min-width: 40rem) { .cards { grid-template-columns: repeat(2, 1fr); } }
.cards li {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.25rem;
}
.cards p { margin: 0; color: var(--muted); font-size: .98rem; }

/* AI principles */
.ai-lead { color: var(--muted); max-width: 36rem; }
.motto {
  font-size: 1.35rem; font-weight: 650; letter-spacing: -.01em;
  margin: 1.5rem 0 1.75rem;
}
.motto s { color: var(--muted); text-decoration-thickness: 2px; }
.motto em { font-style: normal; color: var(--accent); }
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}
.principles {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1rem; counter-reset: p;
}
@media (min-width: 40rem) { .principles { grid-template-columns: 1fr 1fr; } }
.principles li {
  counter-increment: p; position: relative;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.25rem 1.25rem 1.25rem 3.25rem;
}
.principles li::before {
  content: counter(p);
  position: absolute; left: 1.1rem; top: 1.2rem;
  font: 700 .95rem var(--mono); color: var(--accent);
}
.principles p { margin: 0; color: var(--muted); font-size: .98rem; }

/* stack */
.stack { display: grid; gap: 1.5rem; }
@media (min-width: 40rem) { .stack { grid-template-columns: 1fr 1fr; } }
.stack h3 { color: var(--muted); font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; }
.tags { list-style: none; margin: .5rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.tags li {
  background: var(--bg-soft); border: 1px solid var(--line);
  padding: .3rem .8rem; border-radius: 999px; font: .92rem var(--mono);
}

/* contact */
.contact { text-align: left; }
.mail { font-size: 1.4rem; font-weight: 650; }

.foot { padding-block: 2.5rem 3rem; color: var(--muted); font-size: .9rem; border-top: 1px solid var(--line); margin-top: 2rem; }
.foot p { margin: 0; }

/* respect motion preferences: no animation, no transitions, no smooth scroll */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media (forced-colors: active) {
  .btn, .cards li, .tags li { border: 2px solid CanvasText; }
}