/* ==========================================================================
   Zaon global navigation + footer (Phase 1 of the design unification)
   Self-contained: .zn- namespace with its own tokens so it renders
   identically on every page regardless of which stylesheet the page uses.
   Light/dark follows <html data-theme>.
   ========================================================================== */

/* Values derive from /css/zaon-tokens.css (loaded first on every page);
   fallbacks keep the bar rendering even if the tokens file is missing.
   Theming flows through the canonical tokens — no separate dark block. */
.zn-nav, .zn-footer, .zn-dd-menu {
  --zn-bg: var(--bg, #F8F8F6);
  --zn-card: var(--card, #FFFFFF);
  --zn-fill: var(--fill, #F4F3F0);
  --zn-line: var(--line, #E7E4DF);
  --zn-line-2: var(--line-2, #D6D2CB);
  --zn-ink: var(--ink, #1F2937);
  --zn-soft: var(--ink-soft, #4B5563);
  --zn-faint: var(--ink-faint, #6B7280);
  --zn-accent: var(--accent, #8B5CF6);
  --zn-link: var(--link, #6D28D9);
  --zn-wash: var(--accent-wash, #EDE9FE);
  --zn-shadow: var(--shadow, 0 1px 2px rgba(17,16,15,.05), 0 8px 24px -14px rgba(17,16,15,.18));
  --zn-display: var(--display, "Inter Tight", ui-sans-serif, system-ui, sans-serif);
  --zn-body: var(--body, "Inter", ui-sans-serif, system-ui, sans-serif);
  --zn-mono: var(--mono, ui-monospace, "SF Mono", Menlo, Consolas, monospace);
}

/* Global visible keyboard focus (audit fix — applies site-wide) */
:focus-visible {
  outline: 2px solid #8B5CF6 !important;
  outline-offset: 2px;
  border-radius: 4px;
}

/* ------------------------------ nav ------------------------------ */
.zn-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1100;
  height: var(--nav-height);
  display: flex; align-items: center;
  background: color-mix(in srgb, var(--zn-bg) 84%, transparent);
  backdrop-filter: saturate(180%) blur(14px); -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, background .25s ease;
  font-family: var(--zn-body);
}
.zn-nav.zn-scrolled { border-bottom-color: var(--zn-line); background: color-mix(in srgb, var(--zn-bg) 93%, transparent); }
.zn-in {
  display: flex; align-items: center; gap: 18px;
  width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 clamp(18px, 4vw, 40px);
}
.zn-brand { display: flex; align-items: center; gap: 12px; flex: none; text-decoration: none; }
.zn-logo { height: 38px; width: auto; display: block; }
.zn-logo-dark { display: none; }
[data-theme="dark"] .zn-logo-light { display: none; }
[data-theme="dark"] .zn-logo-dark { display: block; }
.zn-sub {
  font-family: var(--zn-display); font-weight: 600; font-size: 17px; letter-spacing: -.01em;
  color: var(--zn-faint); padding-left: 12px; border-left: 1px solid var(--zn-line-2);
}

.zn-links { display: flex; align-items: center; gap: 2px; margin: 0 auto; }
.zn-link {
  font-family: var(--zn-body); font-size: 14px; font-weight: 500; color: var(--zn-soft);
  padding: 8px 13px; border-radius: 8px; text-decoration: none; background: none; border: 0; cursor: pointer;
  transition: color .18s ease, background .18s ease; white-space: nowrap; line-height: 1.4;
}
.zn-link:hover { color: var(--zn-ink); background: var(--zn-fill); }
.zn-link.zn-active { color: var(--zn-link); background: var(--zn-wash); font-weight: 600; }

/* dropdown */
.zn-dd { position: relative; }
.zn-dd-btn { display: inline-flex; align-items: center; gap: 5px; }
.zn-dd-btn svg { width: 12px; height: 12px; transition: transform .18s ease; }
.zn-dd.zn-open .zn-dd-btn svg { transform: rotate(180deg); }
.zn-dd-menu {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 210px;
  background: var(--zn-card); border: 1px solid var(--zn-line); border-radius: 10px;
  box-shadow: var(--zn-shadow); padding: 6px;
  opacity: 0; visibility: hidden; transform: translateY(-4px);
  transition: opacity .16s ease, transform .16s ease, visibility .16s;
}
.zn-dd.zn-open .zn-dd-menu, .zn-dd:focus-within .zn-dd-menu { opacity: 1; visibility: visible; transform: none; }
@media (hover: hover) { .zn-dd:hover .zn-dd-menu { opacity: 1; visibility: visible; transform: none; } }
.zn-dd-menu a {
  display: block; font-size: 14px; font-weight: 500; color: var(--zn-soft);
  padding: 9px 12px; border-radius: 8px; text-decoration: none;
}
.zn-dd-menu a:hover { color: var(--zn-ink); background: var(--zn-fill); }

.zn-actions { display: flex; align-items: center; gap: 10px; flex: none; margin-left: auto; }
.zn-links + .zn-actions { margin-left: 0; }
.zn-cta {
  display: inline-flex; align-items: center; gap: 7px;
  background: linear-gradient(135deg, #8B5CF6 0%, #7C3AED 100%); color: #fff;
  font-family: var(--zn-body); font-size: 13.5px; font-weight: 600;
  padding: 9px 16px; border-radius: 10px; text-decoration: none; white-space: nowrap;
  box-shadow: 0 0 34px rgba(139,92,246,.25);
  transition: transform .18s ease, box-shadow .18s ease;
}
.zn-cta:hover { transform: translateY(-2px); box-shadow: 0 0 50px rgba(139,92,246,.4); }
.zn-theme {
  width: 36px; height: 36px; border-radius: 9px; border: 1px solid var(--zn-line);
  background: var(--zn-card); color: var(--zn-soft);
  display: grid; place-items: center; cursor: pointer; transition: color .18s ease, border-color .18s ease;
  padding: 0;
}
.zn-theme:hover { color: var(--zn-ink); border-color: var(--zn-line-2); }
.zn-theme svg { width: 17px; height: 17px; }
.zn-theme .zn-moon { display: none; }
[data-theme="dark"] .zn-theme .zn-sun { display: none; }
[data-theme="dark"] .zn-theme .zn-moon { display: block; }
.zn-burger {
  display: none; width: 38px; height: 38px; border: 1px solid var(--zn-line);
  background: var(--zn-card); border-radius: 9px; cursor: pointer; padding: 0;
}
.zn-burger span { display: block; width: 17px; height: 2px; background: var(--zn-ink); margin: 3px auto; border-radius: 2px; }

/* mobile */
@media (max-width: 880px) {
  .zn-links { display: none; }
  .zn-links.zn-mobile-open {
    display: flex; position: fixed; top: var(--nav-height); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--zn-card); border-bottom: 1px solid var(--zn-line);
    padding: 12px clamp(18px, 4vw, 40px) 16px; box-shadow: var(--zn-shadow); margin: 0;
  }
  .zn-links.zn-mobile-open .zn-link { padding: 12px; }
  .zn-links.zn-mobile-open .zn-dd-menu {
    position: static; opacity: 1; visibility: visible; transform: none;
    border: 0; box-shadow: none; background: transparent; padding: 0 0 0 16px; display: none;
  }
  .zn-links.zn-mobile-open .zn-dd.zn-open .zn-dd-menu { display: block; }
  .zn-burger { display: block; }
  .zn-sub { display: none; }
}
@media (max-width: 460px) { .zn-cta { padding: 8px 12px; font-size: 12.5px; } }

/* ------------------------------ footer ------------------------------ */
.zn-footer {
  border-top: 1px solid var(--zn-line);
  background: var(--zn-bg);
  padding: clamp(40px, 5vw, 60px) 0 30px;
  font-family: var(--zn-body);
}
.zn-footer * { box-sizing: border-box; }
.zn-foot-wrap { max-width: 1120px; margin: 0 auto; padding: 0 clamp(18px, 4vw, 40px); }
.zn-foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 36px; }
.zn-foot-brand .zn-brand { margin-bottom: 14px; }
.zn-foot-tag { color: var(--zn-soft); font-size: 13.5px; max-width: 30ch; margin: 0; line-height: 1.6; }
.zn-social { display: flex; gap: 9px; margin-top: 16px; }
.zn-social a {
  width: 32px; height: 32px; border-radius: 8px; border: 1px solid var(--zn-line);
  display: grid; place-items: center; color: var(--zn-soft); transition: color .18s ease, border-color .18s ease;
}
.zn-social a:hover { color: var(--zn-link); border-color: var(--zn-accent); }
.zn-social svg { width: 15px; height: 15px; display: block; }
.zn-foot-col h4 {
  font-family: var(--zn-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--zn-faint); margin: 0 0 12px; font-weight: 600;
}
.zn-foot-col a {
  display: block; font-size: 13.5px; color: var(--zn-soft); padding: 4px 0;
  text-decoration: none; transition: color .18s ease;
}
.zn-foot-col a:hover { color: var(--zn-link); }
.zn-foot-bottom {
  margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--zn-line);
  display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between;
  font-size: 12.5px; color: var(--zn-faint);
}
@media (max-width: 760px) { .zn-foot-grid { grid-template-columns: 1fr 1fr; gap: 28px; } .zn-foot-brand { grid-column: 1 / -1; } }
