/* ═══════════════════════════════════════════════════
   Alexander Wilczek — Personal Website
   Shared styles across all pages
   ═══════════════════════════════════════════════════ */

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

/* ── Custom Properties ── */
:root {
  /* Colors — see docs/STYLING.md for usage rules */
  --color-primary: #111;         /* headings, names, conference titles, nav logo */
  --color-body: #2a2a2a;         /* body text, paragraphs, bios, story content */
  --color-secondary: #444;       /* talk titles, supporting text, nav links */
  --color-muted: #5a5a5a;        /* dates, locations, labels, captions, footer — WCAG AA on all backgrounds */
  --color-border: #ddd;          /* dividers, card borders, separators */
  --color-surface: #f5f5f5;      /* card backgrounds, stat boxes */
  --color-bg: #fff;              /* page background */

  /* Upcoming talk cards (dark background variant) */
  --color-upcoming-bg: #333;
  --color-upcoming-hover: #3d3d3d;
  --color-upcoming-text: #ccc;
  --color-upcoming-muted: #aaa;

  /* Legacy aliases — avoid in new code */
  --black: var(--color-primary);
  --white: var(--color-bg);
  --gray-100: var(--color-surface);
  --gray-200: var(--color-border);
  --gray-400: var(--color-muted);
  --gray-600: var(--color-secondary);

  /* Typography */
  --font: 'Roboto', sans-serif;

  /* Layout */
  --max-width: 760px;
  --page-padding: 2rem;
}

/* ── Base ── */
body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
img { display: block; max-width: 100%; }

/* ── Nav ── */
.nav {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 50;
}

.nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem var(--page-padding);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav__logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.25px;
}

.nav__links {
  display: flex;
  gap: 2.25rem;
  list-style: none;
}

.nav__links a {
  text-decoration: none;
  color: var(--color-secondary);
  font-size: 0.9375rem;
  font-weight: 400;
  transition: color 0.2s;
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 2.5rem var(--page-padding);
  border-top: 1px solid var(--color-border);
  margin-top: 3rem;
}

.footer .socials {
  margin-bottom: 1rem;
}

.footer__copy {
  font-size: 0.75rem;
  color: var(--color-muted);
}

/* ── Newsletter Modal ── */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.modal.is-open {
  display: flex;
}

.modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
}

.modal__content {
  position: relative;
  background: var(--color-bg);
  padding: 3rem 2.5rem;
  max-width: 400px;
  width: 90%;
  text-align: center;
}

.modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.25rem;
  color: var(--color-muted);
  cursor: pointer;
  line-height: 1;
  padding: 0.25rem;
}

.modal__close:hover {
  color: var(--color-primary);
}

.modal__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.modal__desc {
  font-size: 0.875rem;
  color: var(--color-body);
  font-weight: 300;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.modal__form {
  display: flex;
}

.modal__input {
  flex: 1;
  padding: 0.875rem 1rem;
  border: 1px solid var(--color-border);
  border-right: none;
  background: var(--color-bg);
  font-family: var(--font);
  font-size: 0.875rem;
  color: var(--color-body);
  outline: none;
  -webkit-appearance: none;
  border-radius: 0;
}

.modal__input:focus {
  border-color: var(--color-primary);
}

.modal__btn {
  padding: 0.875rem 1.5rem;
  background: var(--color-upcoming-bg);
  color: var(--color-bg);
  border: none;
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

.modal__btn:hover {
  background: var(--color-upcoming-hover);
}

/* ── Section Title ── */
.section-title {
  text-align: center;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-muted);
  margin-bottom: 3rem;
}

/* ── Divider ── */
.divider {
  width: 40px;
  height: 1px;
  background: var(--color-border);
  margin: 0 auto;
}

/* ── Social Icons ── */
.socials {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  list-style: none;
  flex-wrap: wrap;
}

.socials a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-secondary);
  font-size: 0.8125rem;
  font-weight: 400;
  transition: color 0.2s;
}

.socials a:hover { color: var(--color-primary); }

.socials svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
  flex-shrink: 0;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  :root {
    --page-padding: 1.5rem;
  }

  .nav__links { gap: 1rem; }

  .nav__links a {
    font-size: 0.75rem;
  }

}