/* ==========================================================
   Your Learning Scientist — minimal link-in-bio
   Teal + citron · light/dark · Satoshi
   ========================================================== */

:root,
[data-theme="light"] {
  color-scheme: light;
  --paper: #F5F4F0;
  --surface: #FFFFFF;
  --surface-2: #E7EBE6;
  --ink: #141A16;
  --muted: #3E4A43;
  --brand: #0A6B56;
  --brand-fill: #0C7A62;
  --signal: #0D8A6E;
  --mark: #D2EB4A;
  --mark-ink: #1A2808;
  --rule: #C4CDC6;
  --shadow: 0 1px 2px rgba(20, 26, 22, 0.06), 0 8px 20px rgba(20, 26, 22, 0.06);
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0B100E;
  --surface: #151C19;
  --surface-2: #1C2621;
  --ink: #F0F5F2;
  --muted: #A8B8B0;
  --brand: #5ED9B8;
  --brand-fill: #14967A;
  --signal: #6EE7C5;
  --mark: #D2EB4A;
  --mark-ink: #152008;
  --rule: #2A3630;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 10px 24px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #0B100E;
    --surface: #151C19;
    --surface-2: #1C2621;
    --ink: #F0F5F2;
    --muted: #A8B8B0;
    --brand: #5ED9B8;
    --brand-fill: #14967A;
    --signal: #6EE7C5;
    --mark: #D2EB4A;
    --mark-ink: #152008;
    --rule: #2A3630;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 10px 24px rgba(0, 0, 0, 0.3);
  }
}

:root {
  --font: 'Satoshi', system-ui, -apple-system, sans-serif;
  --shell: 420px;
  --gutter: 1.25rem;
  --radius: 14px;
}

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

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--paper);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection {
  background: var(--mark);
  color: var(--mark-ink);
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--brand-fill);
  color: #fff;
  border-radius: 8px;
  font-weight: 600;
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* Top bar */
.topbar {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0.75rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 700;
  color: var(--brand);
}
.logo-badge {
  display: inline-grid;
  place-items: center;
  width: 1.625rem;
  height: 1.625rem;
  border-radius: 0.45rem;
  background: var(--brand-fill);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
}
.logo-word {
  font-size: 1rem;
  letter-spacing: 0.06em;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1.5px solid var(--rule);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 0.15s ease, color 0.15s ease;
}
.theme-toggle:hover {
  border-color: var(--brand);
  color: var(--brand);
}
.theme-toggle svg {
  width: 18px;
  height: 18px;
  display: block;
}
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* Shell */
.shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0.5rem var(--gutter) 2.5rem;
}

/* Bio header */
.bio {
  text-align: center;
}

.avatar {
  width: 96px;
  height: 96px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--surface);
  box-shadow: var(--shadow), 0 0 0 1px var(--rule);
}

.name {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.2rem;
}

.handle {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.tagline {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  max-width: 28ch;
  margin: 0 auto 0.5rem;
  color: var(--ink);
}
.tagline .mark {
  display: inline-block;
  margin-bottom: 0.55rem;
  padding: 0.12em 0.2em 0.08em;
}
.tagline-sub {
  display: block;
  margin-top: 0.15rem;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.45;
}

.mark {
  display: inline;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  background-image: linear-gradient(
    transparent 58%,
    var(--mark) 58%,
    var(--mark) 96%,
    transparent 96%
  );
  padding: 0 0.08em;
}

[data-theme="dark"] .mark {
  background-image: linear-gradient(
    transparent 86%,
    var(--mark) 86%,
    var(--mark) 100%,
    transparent 100%
  );
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .mark {
    background-image: linear-gradient(
      transparent 86%,
      var(--mark) 86%,
      var(--mark) 100%,
      transparent 100%
    );
  }
}
[data-theme="light"] .mark {
  background-image: linear-gradient(
    transparent 58%,
    var(--mark) 58%,
    var(--mark) 96%,
    transparent 96%
  );
}

.creds {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

/* Link stack */
.links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.link {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.85rem;
  min-height: 56px;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1.5px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: left;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.link:hover {
  border-color: var(--brand);
  transform: translateY(-1px);
}
.link:active {
  transform: translateY(0);
}

/* Flat mono icons: white on primary, brand ink on secondary */
.link-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  color: var(--brand);
  opacity: 0.9;
}
.link-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.link-primary {
  background: var(--brand-fill);
  border-color: var(--brand-fill);
  color: #fff;
  box-shadow: 0 1px 2px rgba(12, 122, 98, 0.25);
}
.link-primary:hover {
  border-color: var(--brand-fill);
  filter: brightness(1.06);
}
.link-primary .link-icon {
  color: #fff;
  opacity: 1;
}
.link-primary .link-hint {
  color: rgba(255, 255, 255, 0.85);
}

.link-label {
  font-size: 0.975rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.link-hint {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
}

/* Footer */
.footer {
  margin-top: 2rem;
  padding-top: 1.25rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
}

@media (prefers-reduced-motion: reduce) {
  body { transition: none; }
  .link { transition: none; }
  .link:hover { transform: none; }
}

@media (min-width: 480px) {
  :root { --gutter: 1.5rem; }
}