/* ==========================================================================
   Structural layout: header, sections, grids, footer
   ========================================================================== */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ---- Header / Nav — minimal floating bar, inset from the viewport edges ---- */
.site-header {
  position: fixed;
  inset-block-start: 1rem;
  inset-inline: 1rem;
  z-index: 500;
  display: flex;
  justify-content: center;
  transition: transform var(--transition-base);
}

/* Hidden while the locked chat gateway (#hero) is in view — see js/main.js */
.site-header.is-hidden {
  transform: translateY(calc(-100% - 1.5rem));
}

.nav-bar {
  width: 100%;
  max-width: calc(var(--max-width) - 2rem);
  height: 60px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-inline: 1.25rem 0.6rem;
  border-radius: 999px;
  background: rgba(13, 15, 22, 0.72);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.28);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header.is-scrolled .nav-bar {
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  border-color: var(--border-glass-strong);
}

.nav-bar {
  max-width: var(--max-width);
  margin-inline: auto;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-inline: 1.5rem;
}

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  white-space: nowrap;
}

.logo-bracket {
  color: var(--accent-2);
}

.logo-accent {
  color: var(--accent-1);
}

.nav-menu {
  display: flex;
  gap: 1.75rem;
  margin-inline-start: auto;
}

.nav-link {
  font-size: 0.92rem;
  color: var(--text-secondary);
  position: relative;
  padding-block: 0.25rem;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.nav-resume {
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
}

.nav-toggle span {
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ---- Theme toggle ---- */
.theme-toggle {
  position: relative;
  width: 44px;
  height: 26px;
  border-radius: 999px;
  background: var(--surface-glass-strong);
  border: 1px solid var(--border-glass-strong);
  flex-shrink: 0;
}

.theme-toggle-icon {
  position: absolute;
  top: 50%;
  font-size: 0.8rem;
  line-height: 1;
  transform: translateY(-50%);
  transition: opacity var(--transition-fast);
}

.theme-icon-sun { left: 5px; opacity: 0; }
.theme-icon-moon { right: 5px; opacity: 1; }

:root[data-theme="light"] .theme-icon-sun { opacity: 1; }
:root[data-theme="light"] .theme-icon-moon { opacity: 0; }

.theme-toggle::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  transition: transform var(--transition-base);
}

:root[data-theme="light"] .theme-toggle::before {
  transform: translateX(18px);
}

/* ---- Sections ---- */
.section {
  padding-block: clamp(3.5rem, 7vw, 6rem);
}

.section-alt {
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.02) 15%, rgba(255, 255, 255, 0.02) 85%, transparent);
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  margin-bottom: 0.75rem;
}

.section-subtitle {
  color: var(--text-secondary);
  max-width: 62ch;
  margin-bottom: 2.5rem;
}

.section-note {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 80ch;
}

/* ---- Grids ---- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border-glass);
  padding-block: 2rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.back-to-top {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.back-to-top:hover {
  color: var(--accent-2);
}