/* ── Top bar ── */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 300;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 1.75rem var(--gutter);
  pointer-events: none;
}

.topbar__nav {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  pointer-events: auto;
}

.topbar__btn {
  display: inline-block;
  width: fit-content;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  padding: 0.45rem 1rem;
  border-radius: 100px;
  color: var(--text);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.topbar__btn:hover,
.topbar__btn.is-active {
  background: #fff;
  color: #000;
}

.topbar__right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.45rem;
  pointer-events: auto;
}

.lang-nav {
  display: flex;
  gap: 0.15rem;
  list-style: none;
  transition: opacity 0.25s var(--ease);
}

.lang-nav button {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  padding: 0.45rem 0.65rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 6px;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.lang-nav button:hover,
.lang-nav button.is-active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.1);
}

/* Hide En/Fa while menu is open so Close takes its place */
body.panel-open .lang-nav {
  display: none;
}

/* ── Full-screen panel ── */
.panel {
  position: fixed;
  inset: 0;
  z-index: 250;
  background: var(--bg);
  transform: translateY(-100%);
  transition: transform 0.55s var(--ease);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.panel.is-open {
  transform: translateY(0);
}

.panel__inner {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: calc(var(--nav-h) + 2rem) var(--gutter) 3rem;
  max-width: var(--container);
  margin: 0 auto;
}

.panel__close {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  padding: 0.45rem 1rem;
  border-radius: 100px;
  color: var(--text);
  background: transparent;
  border: none;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), opacity 0.3s;
}

.panel__close.is-visible {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
}

.panel__close:hover {
  background: #fff;
  color: #000;
}

.panel__section {
  display: none;
  animation: panelFade 0.4s var(--ease);
}

.panel__section.is-active {
  display: block;
}

@keyframes panelFade {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.panel__title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.panel__jobs span:first-child {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  letter-spacing: inherit;
  margin-top: 0;
}

.panel__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.panel__links a {
  display: block;
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  padding: 0.35rem 0;
  color: var(--text);
  transition: opacity 0.25s var(--ease);
}

.panel__links a:hover {
  opacity: 0.45;
}

.panel__text {
  max-width: 52ch;
}

.panel__text h3 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.panel__text p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 1.5rem;
}

.panel__text a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 100px;
  border: 1px solid var(--line);
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.panel__text a:hover {
  background: #fff;
  color: #000;
}

.panel__bottom {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.panel__bottom h4 {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.panel__social {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.panel__social a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

.panel__social a:hover { color: var(--text); }

.panel__jobs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.panel__jobs a {
  display: block;
  font-size: clamp(1.35rem, 4vw, 2.25rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  padding: 0.4rem 0;
  transition: opacity 0.25s;
}

.panel__jobs a:hover { opacity: 0.45; }

.panel__jobs span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
  letter-spacing: 0.03em;
}

body.panel-open {
  overflow: hidden;
}

/* Persian typography */
html[dir="rtl"] {
  --font-ui: 'Vazirmatn', Tahoma, sans-serif;
}

html[dir="rtl"] body,
html[dir="rtl"] .panel {
  font-family: var(--font-ui);
}

html[dir="rtl"] .topbar__btn,
html[dir="rtl"] .panel__close,
html[dir="rtl"] .panel__title,
html[dir="rtl"] .panel__links a,
html[dir="rtl"] .panel__text h3,
html[dir="rtl"] .panel__text p,
html[dir="rtl"] .panel__bottom h4,
html[dir="rtl"] .panel__jobs a,
html[dir="rtl"] .panel__jobs span,
html[dir="rtl"] .project__category,
html[dir="rtl"] .project__desc,
html[dir="rtl"] .footer__copy {
  font-family: var(--font-ui);
  letter-spacing: 0;
  text-transform: none;
}

html[dir="rtl"] .topbar__btn,
html[dir="rtl"] .panel__close {
  font-size: 0.78rem;
  font-weight: 500;
}

html[dir="rtl"] .panel__title {
  font-size: 0.72rem;
  font-weight: 500;
}

html[dir="rtl"] .panel__links a,
html[dir="rtl"] .panel__jobs a {
  font-weight: 400;
  letter-spacing: 0;
}

html[dir="rtl"] .panel__jobs span:last-child {
  font-size: 0.75rem;
  font-weight: 300;
}

html[dir="rtl"] .topbar {
  flex-direction: row-reverse;
}

html[dir="rtl"] .topbar__nav {
  align-items: flex-end;
}

html[dir="rtl"] .topbar__right {
  align-items: flex-start;
}

html[dir="rtl"] .project__header,
html[dir="rtl"] .project__desc {
  text-align: right;
}

@media (max-width: 480px) {
  .topbar__btn,
  .lang-nav button,
  .panel__close {
    font-size: 0.65rem;
    padding: 0.4rem 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .panel { transition: none; }
  .panel__section { animation: none; }
}