/* ── shared.css — design tokens, reset, navbar, hamburger, footer ── */

/* Design tokens */
:root {
  --color-bg:      #ffffff;
  --color-surface: #f7f8fa;
  --color-border:  #e5e7eb;
  --color-text:    #1f2328;
  --color-muted:   #57606a;
  --color-accent:  #3b82d4;
  --color-green:   #2da44e;
  --nav-height:    52px;
}

/* Anchor jump offset — prevents fixed navbar from covering jump targets */
html {
  scroll-padding-top: var(--nav-height);
}

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

body {
  font-family: -apple-system, "Segoe UI", system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: var(--nav-height);
}

/* ── Nav bar ── */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: var(--nav-height);
  border-bottom: 1px solid var(--color-border);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--color-bg);
  z-index: 1000;
}

.navbar .site-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  font-size: 0.88rem;
  color: var(--color-muted);
  text-decoration: none;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  transition: background 0.12s, color 0.12s;
  white-space: nowrap;
}

.nav-links a:hover { background: var(--color-surface); color: var(--color-text); }
.nav-links a.active { font-weight: 600; color: var(--color-text); }

/* Hamburger — mobile only */
.hamburger {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 5px;
  cursor: pointer;
  padding: 0.4rem 0.5rem;
  flex-direction: column;
  gap: 4px;
  z-index: 200;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

.hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 640px) {
  .hamburger { display: flex; }
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 0.5rem 0;
    z-index: 1000;
    max-height: calc(100vh - var(--nav-height));
    overflow-y: auto;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 0.75rem 2rem;
    border-radius: 0;
    border-bottom: 1px solid #f0f1f3;
  }
  .nav-links a:last-child { border-bottom: none; }
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--color-border);
  padding: 1.25rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-muted);
}

/* ── Keyboard focus — global visible ring ── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ── Main content area — standard centred layout ── */
main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 3rem 2rem;
}

/* ── Page header block — used on interior pages ── */
/* Shared by: about, now, interests, work, work/this-website */
.page-header-block {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.page-header-block h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.page-header-block p {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0;
}

/* ── Page header with outer padding — portfolio / repos style ── */
.page-header {
  padding: 3rem 2rem 0;
  display: flex;
  justify-content: center;
}

.page-header-inner {
  max-width: 760px;
  width: 100%;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 2rem;
}

.page-header-inner h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.page-header-inner p {
  font-size: 0.9rem;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ── State messages — loading / empty / error ── */
/* Shared by: blog listing, repos */
.state-msg {
  font-size: 0.9rem;
  color: var(--color-muted);
  padding: 2rem 0;
  text-align: center;
}

.state-msg.is-error { color: #cf222e; }

.state-msg-icon {
  display: block;
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.state-msg-sub {
  display: block;
  font-size: 0.82rem;
  color: #8b949e;
  margin-top: 0.35rem;
}

/* ── Back link — used on blog post, work sub-pages ── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  text-decoration: none;
  margin-bottom: 2rem;
  transition: color 0.12s;
}

.back-link:hover { color: var(--color-text); }

/* ── Section more link ── */
.section-more {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.82rem;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.section-more:hover { text-decoration: underline; }

/* ── Tag / pill chips — used on multiple pages ── */
.tag-chip {
  font-size: 0.78rem;
  padding: 0.2rem 0.6rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-muted);
}

/* ── Empty / loading state paragraphs (blog, repos) ── */
.empty-state,
.loading {
  padding: 3rem 0;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9rem;
}