/* =========================================================
   Monochrome CV / Portfolio
   Clean, reduced, and highly legible.
   ========================================================= */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --bg: #000000;
  --bg-elevated: #0d0d0d;
  --bg-soft: #080808;
  --text-primary: #ffffff;
  --text-secondary: #a1a1a6;
  --text-tertiary: #6e6e73;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --accent: #ffffff;
  --accent-hover: #a1a1a6;
  --accent-text: #000000;
  --shadow: none;
  --shadow-sm: none;
  --radius: 0px;
  --radius-sm: 0px;
  --radius-pill: 9999px;
  --max-width: 980px;
  --nav-height: 64px;
  --transition: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--text-primary);
  text-decoration: none;
}

a:hover {
  color: var(--text-secondary);
  text-decoration: none;
}

:focus-visible {
  outline: 1px solid var(--text-primary);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 16px;
  background: var(--text-primary);
  color: var(--accent-text);
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  z-index: 200;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 16px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 768px) {
  .container {
    padding: 0 40px;
  }
}

/* Header / Nav */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}

.site-header--scrolled {
  background: rgba(0, 0, 0, 0.9);
  border-bottom-color: var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 768px) {
  .nav {
    padding: 0 40px;
  }
}

.nav__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
}

.nav__logo:hover {
  text-decoration: none;
  opacity: 0.75;
}

.nav__links {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 28px;
  align-items: center;
}

@media (min-width: 900px) {
  .nav__links {
    display: flex;
  }
}

.nav__links a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition);
}

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

.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.lang-toggle:hover {
  background: var(--bg-elevated);
  border-color: var(--text-secondary);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--nav-height);
  padding-bottom: 80px;
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr auto;
  gap: 56px;
  align-items: center;
  justify-content: space-between;
}

.hero__content {
  max-width: 620px;
}

.hero__eyebrow {
  margin: 0 0 18px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.hero__title {
  margin: 0 0 24px;
  font-size: clamp(2.4rem, 6.5vw, 4.4rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--text-primary);
}

.hero__subtitle {
  margin: 0 0 16px;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 50ch;
}

.hero__hint {
  margin: 0;
  font-size: 1rem;
  color: var(--text-tertiary);
}

.hero__visual {
  display: flex;
  justify-content: center;
}

.hero__photo-frame {
  width: auto;
}

.hero__photo {
  width: 180px;
  height: auto;
  object-fit: cover;
  object-position: center top;
  display: block;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.hero__scroll {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-tertiary);
  animation: bounce 2.5s infinite ease-in-out;
}

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

@keyframes bounce {
  0%, 100% {
    transform: translateX(-50%) translateY(0);
    opacity: 0.5;
  }
  50% {
    transform: translateX(-50%) translateY(8px);
    opacity: 1;
  }
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}

.button:hover {
  text-decoration: none;
}

.button--primary {
  background: var(--text-primary);
  color: var(--accent-text);
}

.button--primary:hover {
  background: var(--text-secondary);
  color: var(--accent-text);
}

.button--secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.button--secondary:hover {
  background: var(--bg-elevated);
}

/* Sections */
.section {
  padding: 80px 0;
}

@media (min-width: 768px) {
  .section {
    padding: 120px 0;
  }
}

.section__header {
  margin-bottom: 40px;
}

.section__title {
  margin: 0;
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--text-primary);
}

.section__subtitle {
  margin: 14px 0 0;
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 55ch;
}

/* Positioning */
.positioning__body {
  max-width: none;
}

.positioning__lead {
  margin: 0 0 22px;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.6;
  color: var(--text-primary);
}

.positioning__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.positioning__anchors {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 64px;
  border-top: 1px solid var(--border);
}

@media (min-width: 640px) {
  .positioning__anchors {
    grid-template-columns: repeat(3, 1fr);
  }
}

.anchor {
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  transition: opacity var(--transition);
}

@media (min-width: 640px) {
  .anchor {
    border-bottom: none;
    border-right: 1px solid var(--border);
    padding: 32px 28px;
  }
  .anchor:last-child {
    border-right: none;
  }
}

.anchor:hover {
  opacity: 0.75;
}

.anchor__icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.anchor__title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.anchor__text {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Career */
.career-card {
  border-top: 1px solid var(--border-strong);
  padding: 40px 0;
}

@media (min-width: 768px) {
  .career-card {
    padding: 56px 0;
  }
}

.career-card__header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 28px;
}

@media (min-width: 640px) {
  .career-card__header {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
    gap: 24px;
  }
}

.career-card__company {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.career-card__role {
  margin: 4px 0 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.career-card__meta {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.career-card__intro {
  margin: 0 0 28px;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.career-card__clusters {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

@media (min-width: 768px) {
  .career-card__clusters {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

.career-cluster__title {
  margin: 0 0 16px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.career-card__list {
  margin: 0;
  padding-left: 18px;
  color: var(--text-secondary);
}

.career-card__list li {
  margin-bottom: 12px;
  line-height: 1.6;
}

.career-card__list li::marker {
  color: var(--text-tertiary);
}

.career-card__timeline {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 32px;
  padding: 8px 0;
  overflow-x: auto;
}

.career-card__step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 90px;
}

.career-card__dot {
  width: 10px;
  height: 10px;
  background: var(--text-primary);
}

.career-card__label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
}

.career-card__line {
  flex: 1;
  min-width: 32px;
  height: 1px;
  background: var(--border-strong);
}

.career-card__transfer {
  margin: 0;
  padding: 20px 0;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-primary);
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.project-card {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-strong);
  padding-top: 32px;
  transition: opacity var(--transition);
}

.project-card--project2 {
  order: 1;
}

.project-card--project1 {
  order: 2;
}

.project-card:hover {
  opacity: 0.8;
}

.project-card__header {
  margin-bottom: 24px;
}

.project-card__eyebrow {
  margin: 0 0 8px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.project-card__name {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.project-card__body {
  display: flex;
  flex-direction: column;
  gap: 24px;
  flex: 1;
}

.project-card__block h4 {
  margin: 0 0 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.project-card__block p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.project-card__block--muted {
  padding: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.project-card__block--highlight {
  padding: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.tag-list li {
  padding: 5px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
}

.project-card__footer {
  margin-top: 28px;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-tertiary);
}

.project-card__link[aria-disabled="true"] {
  pointer-events: none;
}

.project-card__link::after {
  content: "→";
}

/* Values */
.values-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-top: 1px solid var(--border);
}

.value {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 20px;
  padding: 36px 0;
  border-bottom: 1px solid var(--border);
}

@media (min-width: 640px) {
  .value {
    grid-template-columns: 56px 1fr;
    gap: 28px;
    padding: 44px 0;
  }
}

.value__number {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.value__title {
  margin: 0 0 12px;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.value__content p {
  margin: 0 0 12px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.value__content p:last-child {
  margin-bottom: 0;
}

/* Education */
.education-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

@media (min-width: 640px) {
  .education-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.education-card {
  padding: 32px 0;
  transition: opacity var(--transition);
}

@media (min-width: 640px) {
  .education-card {
    border-right: 1px solid var(--border);
    padding: 32px 28px;
  }
  .education-card:last-child {
    border-right: none;
  }
}

.education-card:hover {
  opacity: 0.8;
}

.education-card__degree {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.education-card__school,
.education-card__year,
.education-card__grade {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.education-card__grade {
  margin-top: 4px;
  font-weight: 500;
}

.education-card__thesis {
  margin: 12px 0 0;
  font-size: 0.85rem;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Contact */
.section--contact {
  text-align: left;
}

.contact__content {
  width: fit-content;
  max-width: 100%;
}

.section--contact .section__header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.section--contact .section__subtitle {
  max-width: none;
}

.contact__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
}

@media (min-width: 640px) {
  .contact__links {
    flex-direction: row;
    justify-content: center;
    gap: 40px;
  }
}

.contact__link {
  position: relative;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  padding-bottom: 2px;
}

.contact__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--text-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition);
}

.contact__link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.contact__action {
  display: flex;
  justify-content: center;
  margin-top: 8px;
}

/* Footer */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer__copy {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  text-align: left;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}