/* ============================================================
   COMPONENTS — buttons, badges, cards, navbar, theme toggle,
   language switcher, social links, mobile menu
   ============================================================ */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 44px;
  padding-inline: var(--space-5);
  font-size: var(--text-sm);
  font-weight: 500;
  font-family: var(--font-sans);
  letter-spacing: var(--tracking-tight);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
  box-shadow: var(--shadow-accent);
}
.btn--primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 12px 28px var(--color-surface-glow);
}

.btn--secondary {
  background: var(--color-bg-elevated);
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn--secondary:hover {
  border-color: var(--color-text-muted);
  background: var(--color-bg-inset);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
}
.btn--ghost:hover {
  color: var(--color-text);
  background: var(--color-bg-inset);
}

.btn--icon {
  width: 44px;
  height: 44px;
  padding: 0;
  flex-shrink: 0;
}

.btn--sm { height: 36px; padding-inline: var(--space-4); font-size: var(--text-xs); }

.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* ---------- Badge / Tech chip ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-secondary);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--dur-fast) var(--ease-out);
}

.badge svg { width: 14px; height: 14px; }

.badge--interactive:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.badge--accent {
  background: var(--color-accent-soft);
  border-color: transparent;
  color: var(--color-accent);
}

/* ---------- Card ---------- */
.card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-navbar);
  height: var(--navbar-height-mobile);
  display: flex;
  align-items: center;
  transition: height var(--dur-base) var(--ease-out),
              background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              backdrop-filter var(--dur-base) var(--ease-out);
  border-block-end: 1px solid transparent;
}

.navbar.is-scrolled {
  height: var(--navbar-height-mobile);
  background: color-mix(in srgb, var(--color-bg) 80%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-block-end-color: var(--color-border);
}

@media (min-width: 768px) {
  .navbar { height: var(--navbar-height); }
  .navbar.is-scrolled { height: 60px; }
}

.navbar__inner {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.navbar__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-md);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

.navbar__brand-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: var(--color-bg);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  transition: transform var(--dur-base) var(--ease-out);
}
.navbar__brand:hover .navbar__brand-mark { transform: rotate(-8deg); }

.navbar__nav {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 1024px) {
  .navbar__nav { display: flex; }
}

.navbar__link {
  position: relative;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out);
}
.navbar__link:hover { color: var(--color-text); background: var(--color-bg-inset); }
.navbar__link::after {
  content: "";
  position: absolute;
  inset-block-end: 4px;
  inset-inline: var(--space-3);
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--dur-base) var(--ease-out);
}
.navbar__link:hover::after { transform: scaleX(1); }

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.navbar__cta { display: none; }
@media (min-width: 768px) { .navbar__cta { display: inline-flex; } }

.navbar__menu-btn { display: inline-flex; }
@media (min-width: 1024px) { .navbar__menu-btn { display: none; } }

/* ---------- Theme toggle ---------- */
.theme-toggle {
  position: relative;
  overflow: hidden;
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition: transform var(--dur-base) var(--ease-out),
              opacity var(--dur-base) var(--ease-out);
}
[data-theme="light"] .theme-toggle .icon-sun { transform: translateY(0); opacity: 1; }
[data-theme="light"] .theme-toggle .icon-moon { transform: translateY(150%); opacity: 0; }
[data-theme="dark"] .theme-toggle .icon-sun { transform: translateY(-150%); opacity: 0; }
[data-theme="dark"] .theme-toggle .icon-moon { transform: translateY(0); opacity: 1; }

/* ---------- Language switcher ---------- */
.lang-switch {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding-inline: var(--space-1);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
}
.lang-switch__opt {
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
}
.lang-switch__opt.is-active {
  background: var(--color-text);
  color: var(--color-bg);
}

/* ---------- Social links ---------- */
.socials {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.social-link {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  color: var(--color-text-muted);
  transition: all var(--dur-fast) var(--ease-out);
}
.social-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.social-link svg { width: 18px; height: 18px; }

/* ---------- Mobile menu ---------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-mobile-menu);
  background: var(--color-bg);
  padding: var(--navbar-height-mobile) var(--space-6) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out),
              visibility var(--dur-base) var(--ease-out);
}
.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.mobile-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-text);
  border-block-end: 1px solid var(--color-border);
}
.mobile-menu__link span:last-child {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.mobile-menu__footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-block-start: 1px solid var(--color-border);
}

@media (min-width: 1024px) {
  .mobile-menu { display: none; }
}

/* ---------- Project card ---------- */
.project-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}
.project-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-bg-inset);
  border-block-end: 1px solid var(--color-border);
}
.project-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease-out);
}
.project-card:hover .project-card__media img { transform: scale(1.04); }

.project-card__media-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  gap: var(--space-2);
  padding: var(--space-4);
  background: linear-gradient(to top, rgba(0,0,0,0.45), transparent 60%);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}
.project-card:hover .project-card__media-overlay { opacity: 1; }

.project-card__action {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-bg-elevated);
  color: var(--color-text);
  box-shadow: var(--shadow-md);
  transform: translateY(8px);
  transition: transform var(--dur-base) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.project-card:hover .project-card__action { transform: none; }
.project-card__action:hover {
  background: var(--color-accent);
  color: var(--color-accent-text);
}
.project-card__action svg { width: 16px; height: 16px; }

.project-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
  flex: 1;
}

.project-card__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
}
.project-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
}
.project-card__year {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.project-card__desc {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-4);
}

/* ---------- Skill group ---------- */
.skill-group__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.skill-group__title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  padding-inline-start: var(--space-6);
}
.timeline::before {
  content: "";
  position: absolute;
  inset-block: 4px;
  inset-inline-start: 6px;
  width: 1px;
  background: var(--color-border);
}
.timeline__item {
  position: relative;
  padding-block: var(--space-4);
}
.timeline__item::before {
  content: "";
  position: absolute;
  inset-inline-start: calc(-1 * var(--space-6) + 1px);
  inset-block-start: calc(var(--space-4) + 6px);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  transition: transform var(--dur-base) var(--ease-out);
}
.timeline__item:hover::before { transform: scale(1.25); }
.timeline__period {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-1);
}
.timeline__title {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 600;
  margin-bottom: var(--space-1);
}
.timeline__org {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.timeline__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  max-width: 60ch;
}

/* ---------- Stat block ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.stat__value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tighter);
  color: var(--color-accent);
}
.stat__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}