/* ===== Components ===== */
/* Navbar, theme toggle, project cards, writing items, social links, footer */

/* ——— Skip Link ——— */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-3) var(--space-6);
  background-color: var(--accent);
  color: #ffffff;
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: 500;
  border-radius: var(--radius-sm);
  z-index: 200;
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ——————————————————————————————————————————
   Navigation
   —————————————————————————————————————————— */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out),
              background-color var(--duration-slow) var(--ease-in-out),
              border-color var(--duration-slow) var(--ease-in-out);
  background: var(--nav-glass);
  backdrop-filter: blur(24px) saturate(1.2);
  -webkit-backdrop-filter: blur(24px) saturate(1.2);
  border-bottom: 1px solid var(--border);
}

.nav.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

@media (min-width: 768px) {
  .nav__inner {
    height: 64px;
  }
}

.nav__logo {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-primary);
  transition: color var(--duration-fast) var(--ease-in-out);
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-10);
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

.nav__links a {
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: 400;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-in-out);
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--text-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-normal) var(--ease-out);
}

.nav__links a:hover,
.nav__links a.is-active {
  color: var(--text-primary);
}

.nav__links a:hover::after,
.nav__links a.is-active::after {
  transform: scaleX(1);
}

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

/* ——— Theme Toggle ——— */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-in-out),
              background-color var(--duration-fast) var(--ease-in-out);
}

.theme-toggle:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* Light mode: show moon. Dark mode: show sun */
.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

/* ——— Mobile Menu Toggle ——— */
.nav__mobile-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 6px;
}

@media (min-width: 768px) {
  .nav__mobile-toggle {
    display: none;
  }
}

.nav__mobile-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background-color: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-normal) var(--ease-out);
  transform-origin: center;
}

.nav__mobile-toggle.is-active span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.nav__mobile-toggle.is-active span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

/* ——— Mobile Menu Overlay ——— */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-slow) var(--ease-out),
              background-color var(--duration-slow) var(--ease-in-out);
}

.mobile-menu.is-open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-10);
}

.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  transition: color var(--duration-fast) var(--ease-in-out),
              opacity var(--duration-fast) var(--ease-in-out);
}

.mobile-menu a:hover {
  opacity: 0.5;
}

/* ——— Section Label ——— */
.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--text-tertiary);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

/* ——————————————————————————————————————————
   Project Card
   —————————————————————————————————————————— */
.project-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 768px) {
  .project-card {
    grid-template-columns: 1fr 1.15fr;
    gap: var(--space-12);
  }

  .project-card--reverse {
    grid-template-columns: 1.15fr 1fr;
  }

  .project-card--reverse .project-card__visual {
    order: -1;
  }
}

@media (min-width: 1024px) {
  .project-card {
    gap: var(--space-16);
  }
}

.project-card__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.project-card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--text-tertiary);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
}

.project-card__description {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 460px;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--text-primary);
  margin-top: var(--space-2);
  transition: gap var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-in-out);
}

.project-card__link:hover {
  gap: var(--space-3);
  color: var(--accent);
}

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

/* ——— Project Visual ——— */
.project-card__visual {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-surface);
  aspect-ratio: 16 / 10;
  border: 1px solid var(--border);
  transition: background-color var(--duration-slow) var(--ease-in-out),
              border-color var(--duration-slow) var(--ease-in-out);
  /* Subtle dot grid fallback if image fails to load */
  background-image: radial-gradient(circle, var(--border) 0.75px, transparent 0.75px);
  background-size: 20px 20px;
}

.project-card__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
  transition: transform var(--duration-slow) var(--ease-out),
              filter var(--duration-slow) var(--ease-in-out);
}

/* Subtle adjustment for light-bg images in dark mode */
[data-theme="dark"] .project-card__visual img {
  filter: brightness(0.85) contrast(1.1);
}

.project-card__visual:hover img {
  transform: scale(1.03);
}

/* ——————————————————————————————————————————
   Writing Item
   —————————————————————————————————————————— */
.writing-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left var(--duration-normal) var(--ease-out),
              border-color var(--duration-slow) var(--ease-in-out);
  cursor: pointer;
}

.writing-item:first-child {
  border-top: 1px solid var(--border);
}

.writing-item:hover {
  padding-left: var(--space-4);
}

@media (min-width: 640px) {
  .writing-item {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-8);
    padding: var(--space-8) 0;
  }
}

.writing-item__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
  transition: color var(--duration-fast) var(--ease-in-out);
}

.writing-item:hover .writing-item__title {
  color: var(--accent);
}

.writing-item__meta {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--text-tertiary);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ——————————————————————————————————————————
   Social Links
   —————————————————————————————————————————— */
.social-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-small);
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-in-out);
}

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

.social-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ——————————————————————————————————————————
   Footer
   —————————————————————————————————————————— */
.footer {
  padding: var(--space-12) 0;
  border-top: 1px solid var(--border);
  transition: border-color var(--duration-slow) var(--ease-in-out);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__text {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--text-tertiary);
  letter-spacing: 0.01em;
}

/* ——————————————————————————————————————————
   Project Card Links (multi-link variant)
   —————————————————————————————————————————— */
.project-card__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-top: var(--space-2);
}

.project-card__link--external {
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-in-out);
}

.project-card__link--external:hover {
  color: var(--accent);
}

/* ——————————————————————————————————————————
   Future Projects Teaser
   —————————————————————————————————————————— */
.future-projects {
  margin-top: var(--space-32);
  padding-top: var(--space-20);
  border-top: 1px solid var(--border);
  transition: border-color var(--duration-slow) var(--ease-in-out);
}

.future-projects__header {
  max-width: 600px;
  margin-bottom: var(--space-12);
}

.future-projects__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  line-height: var(--leading-tight);
}

.future-projects__subtitle {
  color: var(--text-secondary);
  font-size: var(--text-body);
  line-height: var(--leading-relaxed);
}

.future-projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .future-projects__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

.future-card {
  position: relative;
  padding: var(--space-8);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  transition: background-color var(--duration-slow) var(--ease-in-out),
              border-color var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
  overflow: hidden;
}

.future-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37,99,235,0.04) 0%, transparent 60%);
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out);
  opacity: 0;
}

.future-card:hover::before {
  opacity: 1;
}

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

[data-theme="dark"] .future-card:hover {
  border-color: var(--accent);
}

.future-card__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 100px;
  padding: 0.2em 0.75em;
  margin-bottom: var(--space-4);
  opacity: 0.8;
}

.future-card__category {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--text-tertiary);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.future-card__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  line-height: var(--leading-snug);
}

.future-card__description {
  color: var(--text-secondary);
  font-size: var(--text-body);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

.future-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.future-card__tags span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.2em 0.6em;
  transition: background-color var(--duration-slow) var(--ease-in-out),
              border-color var(--duration-slow) var(--ease-in-out);
}