/* ==========================================================================
   NOTHING DESIGN SYSTEM — MINIMALIST ARCHITECTURE
   Monochrome, Industrial, Typographic
   ========================================================================== */

:root {
  --black: #000000;
  --surface: #0a0a0a;
  --surface-raised: #121212;
  --border: #1a1a1a;
  --border-visible: #2a2a2a;
  --text-disabled: #555555;
  --text-secondary: #888888;
  --text-primary: #e0e0e0;
  --text-display: #ffffff;
  --accent: #D71921; /* Signature Nothing Red */

  --font-body: "Space Grotesk", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "Space Mono", monospace;

  --ease-nothing: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 180ms var(--ease-nothing);
  --ease-section: cubic-bezier(0.22, 0.61, 0.36, 1);
  --transition-nav: 650ms var(--ease-section);
  --transition-smooth: 400ms var(--ease-nothing);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--black);
  color: var(--text-primary);
}

body {
  font-family: var(--font-body);
  background-color: var(--black);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* ==========================================================================
   LEFT FIXED VERTICAL NAVBAR
   Vertical upward oriented typography (writing-mode: vertical-rl)
   ========================================================================== */

.side-nav {
  position: fixed;
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.nav-link {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  position: relative;
  padding: 6px 4px;
  transition: transform var(--transition-fast);
}

.nav-text {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--text-disabled);
  writing-mode: vertical-rl;
  transform: rotate(180deg); /* Text flows bottom-to-top */
  transition: color var(--transition-nav), transform var(--transition-nav);
}

.nav-link:hover .nav-text {
  color: var(--text-display);
}

.nav-link.active .nav-text {
  color: var(--text-display);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  left: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

/* ==========================================================================
   HERO SECTION (BALANCED LOW-EXPOSURE PHOTO + TYPOGRAPHY)
   ========================================================================== */

.hero {
  position: relative;
  width: 100vw;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0 80px 0 110px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-photo {
  position: absolute;
  right: 6%;
  top: 50%;
  transform: translateY(-50%);
  height: 82vh;
  max-height: 780px;
  width: auto;
  object-fit: contain;
  filter: grayscale(100%) contrast(1.18) brightness(0.65);
  opacity: 0.82;
  transition: transform 0.1s linear, opacity var(--transition-smooth);
}

.hero-fade {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at 75% 50%,
    transparent 20%,
    rgba(0, 0, 0, 0.5) 55%,
    var(--black) 90%
  );
  pointer-events: none;
}

/* Subtle gradient mask to seamlessly blend the left and bottom edges */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    var(--black) 0%,
    rgba(0, 0, 0, 0.85) 25%,
    transparent 65%
  ),
  linear-gradient(
    0deg,
    var(--black) 0%,
    transparent 25%
  );
  pointer-events: none;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 740px;
}

.hero-name {
  font-family: var(--font-body);
  font-size: clamp(3.2rem, 7.5vw, 6.2rem);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.04em;
  color: var(--text-display);
  display: flex;
  flex-direction: column;
  margin-bottom: 22px;
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(12px, 1.4vw, 14px);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
  margin-bottom: 34px;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* BUTTONS */
.btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--black);
  background-color: var(--text-display);
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid var(--text-display);
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-pill:hover {
  background-color: transparent;
  color: var(--text-display);
}

.btn-pill.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-visible);
}

.btn-pill.btn-outline:hover {
  border-color: var(--text-display);
  color: var(--text-display);
}

.dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--accent);
}

/* SCROLL HINT */
.scroll-hint {
  position: absolute;
  bottom: 30px;
  left: calc(110px);
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--text-disabled);
  text-decoration: none;
  z-index: 2;
  animation: bob 2s infinite var(--ease-nothing);
}

@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ==========================================================================
   MAIN CONTENT & SECTIONS
   ========================================================================== */

.main-content {
  position: relative;
  z-index: 2;
  padding: 60px 80px 100px;
  max-width: 1280px;
  margin-inline: auto;
}

.section {
  min-height: 70vh;
  padding: 90px 0;
  border-top: 1px solid var(--border);
}

.section-inner {
  max-width: 1040px;
  margin-inline: auto;
}

/* REVEAL ANIMATIONS */
.reveal-hero {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1.5s var(--ease-section) forwards;
  animation-delay: var(--d, 0s);
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1.5s var(--ease-section), transform 1.8s var(--ease-section);
  will-change: opacity, transform;
}

.reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* TYPOGRAPHY HELPERS */
.label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-disabled);
}

.value {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
}

.value.link {
  text-decoration: none;
  transition: color var(--transition-fast);
}

.value.link:hover {
  color: var(--accent);
}

/* ==========================================================================
   02. ABOUT
   ========================================================================== */

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  align-items: start;
}

.big-text {
  font-size: clamp(1.4rem, 2.2vw, 2rem);
  font-weight: 500;
  line-height: 1.35;
  color: var(--text-display);
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.big-text strong {
  font-weight: 700;
  color: var(--text-display);
}

.sub-text {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-secondary);
}

.about-specs {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.spec-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

/* ==========================================================================
   03. PROJECTS
   ========================================================================== */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.project-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.project-card:hover {
  border-color: var(--border-visible);
  background-color: var(--surface-raised);
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  border: 1px solid var(--border-visible);
  padding: 2px 8px;
  border-radius: 999px;
}

.tag.accent {
  color: var(--accent);
  border-color: var(--accent);
}

.card-name {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-display);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.card-sub {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.card-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 22px;
}

.card-tags span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--text-disabled);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 4px;
}

.card-action {
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0;
  text-align: left;
  transition: color var(--transition-fast);
}

.card-action:hover {
  color: var(--text-display);
}

/* ==========================================================================
   04. EXPERIENCE
   ========================================================================== */

.exp-list {
  display: flex;
  flex-direction: column;
}

.exp-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}

.exp-item:first-child {
  padding-top: 0;
}

.exp-item:last-child {
  border-bottom: none;
}

.exp-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.exp-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  font-weight: 700;
}

.exp-org {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-display);
}

.exp-role {
  font-size: 13px;
  color: var(--text-secondary);
}

.exp-right {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
}

.exp-right strong {
  color: var(--text-display);
}

/* ==========================================================================
   05. SKILLS
   ========================================================================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-group {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
}

.skill-group .label {
  display: block;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.skill-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.skill-group li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-primary);
}

.meter {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--text-display);
}

/* ==========================================================================
   06. CONTACT
   ========================================================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 60px;
  align-items: center;
}

.contact-heading {
  font-size: clamp(2rem, 3.8vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-display);
  margin-bottom: 28px;
}

.contact-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.contact-right {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}

/* ==========================================================================
   DRAWER & TOAST & FOOTER
   ========================================================================== */

.drawer {
  margin: 0;
  padding: 0;
  border: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  color: var(--text-primary);
  background: transparent;
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  justify-content: flex-end;
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.drawer:not([open]) {
  display: none;
}

.drawer::backdrop {
  background: transparent;
}

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.drawer.open {
  visibility: visible;
  opacity: 1;
}

.drawer-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
}

.drawer-panel {
  position: relative;
  z-index: 1001;
  width: min(620px, 90vw);
  height: 100%;
  background-color: var(--black);
  border-left: 1px solid var(--border-visible);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
  overflow-y: auto;
}

.drawer.open .drawer-panel {
  transform: translateX(0);
}

.drawer-head {
  position: sticky;
  top: 0;
  background-color: var(--black);
  border-bottom: 1px solid var(--border);
  padding: 20px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drawer-close {
  background: transparent;
  border: none;
  font-size: 24px;
  color: var(--text-secondary);
  cursor: pointer;
  line-height: 1;
}

.drawer-close:hover {
  color: var(--accent);
}

.drawer-body {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.ascii-diagram {
  background-color: var(--surface);
  border: 1px solid var(--border-visible);
  padding: 16px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  color: var(--text-primary);
  overflow-x: auto;
  white-space: pre;
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  background-color: var(--text-display);
  color: var(--black);
  padding: 10px 18px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 8px;
  transform: translateY(100px);
  opacity: 0;
  transition: transform var(--transition-smooth), opacity var(--transition-smooth);
  pointer-events: none;
}

.toast.active {
  transform: translateY(0);
  opacity: 1;
}

.footer {
  padding: 30px 80px 40px 110px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-disabled);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 1024px) {
  .hero {
    padding: 0 40px 0 80px;
  }
  .main-content {
    padding: 60px 64px 80px;
  }
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-photo {
    right: 2%;
    height: 70vh;
    opacity: 0.55;
  }
}

@media (max-width: 768px) {
  .side-nav {
    top: 72px;
    left: 12px;
    right: 12px;
    transform: none;
    display: none;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
    padding: 12px;
    max-height: calc(100svh - 88px);
    overflow-y: auto;
    border: 1px solid var(--border-visible);
    border-radius: 12px;
    background: var(--surface-raised);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
    z-index: 119;
  }
  .side-nav.mobile-open { display: grid; }
  .nav-link {
    justify-content: flex-start;
    min-height: 48px;
    padding: 12px;
    border-radius: 8px;
  }
  .nav-link:last-child { grid-column: 1 / -1; }
  .nav-link.active { background: var(--border); }
  .nav-text {
    writing-mode: horizontal-tb;
    transform: none;
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    transition: color var(--transition-nav);
  }
  .nav-link.active::after {
    left: auto;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
  }
  section[id] { scroll-margin-top: 80px; }
  .hero {
    padding: 100px 24px 60px;
  }
  .main-content {
    padding: 40px 24px 80px;
  }
  .hero-photo {
    right: -10%;
    height: 55vh;
    opacity: 0.35;
  }
  .exp-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .skills-grid {
    grid-template-columns: 1fr;
  }
  .footer {
    padding: 24px;
  }
  .scroll-hint {
    left: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal-hero {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }
  .nav-text, .hero-photo { transition: none; }
  .scroll-hint { animation: none; }
}

/* Language selector */
.language-switcher {
  position: fixed;
  top: 24px;
  right: 28px;
  z-index: 110;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border: 1px solid var(--border-visible);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.94);
  font-family: var(--font-mono);
  color: var(--text-disabled);
}
.language-switcher button {
  min-width: 36px;
  min-height: 36px;
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  font: 700 11px var(--font-mono);
  cursor: pointer;
  transition: color var(--transition-nav);
}
.language-switcher button[aria-pressed="true"] { color: var(--text-display); }
.language-switcher button:hover { color: var(--accent); }
.hero-cta { flex-wrap: wrap; }
.spec-row { gap: 12px; }
.spec-row .value { text-align: right; }
@media (max-width: 768px) {
  .language-switcher { top: 8px; right: 12px; }
  .hero { padding-top: 112px; }
}

.certificates {
  margin-top: 28px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}
.certificate-list {
  margin-top: 16px;
  padding-left: 18px;
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.7;
}
.certificate-list li + li { margin-top: 10px; }
.spec-row .value { min-width: 0; overflow-wrap: anywhere; }

.project-part + .project-part {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-visible);
}
.project-part h4 {
  margin-bottom: 8px;
  color: var(--text-display);
  font-size: 15px;
  font-weight: 600;
}
.spec-details, .spec-part {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.spec-part + .spec-part {
  padding-top: 28px;
  border-top: 1px solid var(--border-visible);
}
.spec-part-title {
  color: var(--text-display);
  font-size: 20px;
  line-height: 1.35;
}

.section-heading {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--text-display);
  margin-bottom: 30px;
}
.about-text { max-width: 780px; margin-inline: auto; }
.about-text .sub-text {
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: var(--text-primary);
}
.education-item { display: grid; gap: 12px; }
.education-degree { color: var(--text-secondary); font-size: 16px; }
.contact-icons { display: flex; flex-wrap: wrap; gap: 18px; }
.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border: 1px solid var(--border-visible);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text-primary);
  transition: color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
.contact-icon svg { width: 26px; height: 26px; }
.contact-icon:hover { color: var(--text-display); border-color: var(--text-secondary); transform: translateY(-3px); }
@media (max-width: 768px) {
  .contact-icons { gap: 14px; }
  .contact-icon { width: 60px; height: 60px; }
}
@media (prefers-reduced-motion: reduce) {
  .contact-icon { transition: none; }
  .contact-icon:hover { transform: none; }
}

.more-projects {
  margin-top: 24px;
  font-size: 13px;
  font-weight: 300;
  line-height: 1.6;
}
.more-projects a {
  color: var(--text-secondary);
  text-decoration: none;
  text-underline-offset: 4px;
}
.more-projects a:hover {
  color: var(--text-display);
  text-decoration: underline;
}

#education {
  min-height: auto;
  padding-block: 48px;
}
#education .section-heading { margin-bottom: 20px; }
@media (max-width: 768px) {
  #education { padding-block: 36px; }
}

#experience {
  min-height: auto;
  padding-bottom: 40px;
}
#experience .exp-item:last-child { padding-bottom: 0; }
@media (max-width: 768px) {
  #experience { padding-bottom: 32px; }
}

.cv-trigger { cursor: pointer; }
.cv-popover {
  position: fixed;
  inset: auto;
  margin: 0;
  width: 176px;
  padding: 14px;
  border: 1px solid var(--border-visible);
  border-radius: 12px;
  background: var(--surface-raised);
  color: var(--text-display);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
}
.cv-popover-label {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
}
.cv-options { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.cv-option {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  border: 1px solid var(--border-visible);
  border-radius: 7px;
  font: 700 12px var(--font-mono);
  color: var(--text-display);
  text-decoration: none;
}
.cv-option:hover { border-color: var(--text-secondary); background: var(--surface); }

.card-title-row, .project-part-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}
.card-title-row .card-name, .project-part-heading h4 {
  margin-bottom: 0;
  min-width: 0;
}
.project-repo-link {
  flex: 0 0 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-visible);
  border-radius: 10px;
  color: var(--text-secondary);
  background: transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.project-repo-link svg { width: 22px; height: 22px; }
.project-repo-link:hover { color: var(--text-display); border-color: var(--text-secondary); }
@media (prefers-reduced-motion: reduce) {
  .project-repo-link { transition: none; }
}

.mobile-header { display: none; }
@media (max-width: 768px) {
  .mobile-header {
    position: fixed;
    inset: 0 0 auto;
    height: 64px;
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-visible);
    background: rgba(0, 0, 0, 0.96);
    z-index: 120;
  }
  .mobile-menu-toggle {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 48px;
    max-width: calc(100% - 120px);
    padding: 8px 4px;
    border: 0;
    background: transparent;
    color: var(--text-display);
    font: 700 11px var(--font-mono);
    letter-spacing: 0.03em;
    cursor: pointer;
  }
  .mobile-menu-toggle svg { width: 22px; height: 22px; flex-shrink: 0; }
  .language-switcher { z-index: 121; }
}

/* Let mobile sections follow their content instead of desktop viewport heights. */
@media (max-width: 768px) {
  .main-content { padding: 24px 24px 32px; }
  .section { min-height: auto; padding-block: 40px; }
  #experience { padding-top: 40px; padding-bottom: 32px; }
  #education { padding-block: 32px; }
  #contact { padding-bottom: 24px; }
}