/* ===========================
   Design Tokens
   =========================== */
:root {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f3f3f2;
  --color-text-primary: #2a2a28;
  --color-text-secondary: #22262f;
  --color-text-muted: #6b6b6b;
  --color-accent: #2a2a28;
  --color-border: #e0e0de;

  --font-heading: 'Manrope', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius-card: 20px;
  --radius-button: 12px;

  --max-width: 1200px;
  --nav-height: 72px;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
  --space-2xl: 100px;
}

/* ===========================
   Reset & Base
   =========================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* ===========================
   Layout
   =========================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ===========================
   Nav
   =========================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
}

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

.nav__logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text-primary);
}

.nav__links {
  display: flex;
  gap: var(--space-lg);
}

.nav__links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

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

/* Hamburger */
.nav__hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 4px;
}

.nav__hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav__hamburger[aria-expanded="true"] .nav__hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===========================
   Hero
   =========================== */
.hero {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  background-color: var(--color-bg-primary);
}

.hero__content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.hero__avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  background-color: var(--color-bg-secondary);
}

.hero__headline {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2.25rem;
  line-height: 1.3;
  color: var(--color-text-primary);
}

.hero__headline strong {
  font-weight: 800;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 520px;
}

.hero__linkedin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: var(--color-text-muted);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.hero__linkedin:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

/* ===========================
   Section Title
   =========================== */
.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

/* ===========================
   Projects
   =========================== */
.projects {
  padding: var(--space-xl) 0;
  background-color: var(--color-bg-secondary);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.project-card {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.project-card__image-wrapper {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--color-bg-secondary);
}

.project-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-card__body {
  padding: var(--space-md) var(--space-md) var(--space-lg);
}

.project-card__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.375rem;
  margin-bottom: var(--space-xs);
}

.project-card__tagline {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.project-card__description {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ===========================
   About
   =========================== */
.about {
  padding: var(--space-xl) 0;
  background-color: var(--color-bg-primary);
}

.about--page {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  min-height: calc(100vh - 120px);
}

.about__layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-lg);
  align-items: start;
}

.about__image-wrapper {
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-bg-secondary);
}

.about__image {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 5;
}

.about__text {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.about__text p {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.about__text strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

/* Chart Blocks (inside Journey section) */
.journey__chart-block {
  margin-bottom: var(--space-xl);
}

.journey__chart-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.journey__chart-iframe {
  width: 100%;
  height: 380px;
  border: none;
  border-radius: var(--radius-card);
  background-color: transparent;
}

/* ===========================
   Life Grid
   =========================== */
.life {
  padding: var(--space-xl) 0;
  background-color: var(--color-bg-secondary);
}

.life__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 280px;
  gap: var(--space-sm);
}

.life__item {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-bg-primary);
}

.life__item--tall {
  grid-row: span 2;
}

.life__item--wide {
  grid-column: span 2;
}

.life__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.life__item:hover .life__image {
  transform: scale(1.05);
}

.life__label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.55));
  color: #ffffff;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
}

/* ===========================
   Resume
   =========================== */
.resume {
  padding: var(--space-xl) 0;
  background-color: var(--color-bg-secondary);
  text-align: center;
}

.resume__text {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.resume__download {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 14px 28px;
  background-color: var(--color-accent);
  color: var(--color-bg-primary);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-button);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.resume__download:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

/* ===========================
   Footer
   =========================== */
.footer {
  padding: var(--space-lg) 0;
  background-color: var(--color-bg-primary);
  border-top: 1px solid var(--color-border);
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer__linkedin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--color-text-muted);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.footer__linkedin:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ===========================
   Journey
   =========================== */
.journey {
  padding: var(--space-xl) 0;
  background-color: var(--color-bg-secondary);
}

/* Stat Counters */
.journey__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.journey__stat {
  text-align: center;
  padding: var(--space-lg) var(--space-sm);
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-card);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

.journey__stat-number {
  display: block;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 2.5rem;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-xs);
}

.journey__stat-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Places Chart (Plotly iframe) */
.journey__places {
  margin-bottom: var(--space-xl);
}

.journey__places-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.journey__places-iframe {
  width: 100%;
  height: 380px;
  border: none;
  border-radius: var(--radius-card);
  background-color: transparent;
}

/* Timeline */
.journey__timeline {
  margin-bottom: var(--space-xl);
}

.journey__timeline-track {
  position: relative;
  padding: var(--space-lg) 0;
}

.journey__timeline-line {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 4px;
  transform: translateY(-50%);
}

.journey__line {
  stroke: var(--color-border);
  stroke-width: 4;
  stroke-dasharray: 2000;
  stroke-dashoffset: 2000;
  transition: stroke-dashoffset 1.5s ease;
}

.journey__timeline-track.is-drawn .journey__line {
  stroke-dashoffset: 0;
}

.journey__timeline-nodes {
  position: relative;
  display: flex;
  justify-content: space-between;
  z-index: 1;
}

.journey__node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.journey__node-year {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.journey__node-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-bg-primary);
  border: 3px solid var(--color-border);
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.journey__node:hover .journey__node-dot,
.journey__node[aria-expanded="true"] .journey__node-dot {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  transform: scale(1.3);
}

.journey__node:hover .journey__node-year,
.journey__node[aria-expanded="true"] .journey__node-year {
  color: var(--color-text-primary);
}

.journey__node:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 4px;
}

/* Timeline Details */
.journey__timeline-details {
  min-height: 120px;
}

.journey__detail {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-card);
  padding: var(--space-md) var(--space-lg);
  animation: journeySlideIn 0.3s ease;
}

.journey__detail[hidden] {
  display: none;
}

@keyframes journeySlideIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.journey__detail-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.journey__detail-location {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 500;
  display: block;
  margin-bottom: var(--space-xs);
}

.journey__detail-text {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* ===========================
   Responsive — Tablet (810px)
   =========================== */
@media (max-width: 810px) {
  :root {
    --space-xl: 60px;
  }

  .hero__headline {
    font-size: 1.875rem;
  }

  .projects__grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

  .about__layout {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

  .about__image {
    aspect-ratio: 16 / 10;
  }

  .journey__chart-iframe {
    height: 360px;
  }

  .life__grid {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: 220px;
  }

  .life__item--tall {
    grid-row: span 2;
  }

  .life__item--wide {
    grid-column: span 2;
  }

  /* Journey — tablet */
  .journey__stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .journey__timeline-track {
    padding: var(--space-md) 0 var(--space-md) var(--space-lg);
  }

  .journey__timeline-line {
    display: none;
  }

  .journey__timeline-track::before {
    content: '';
    position: absolute;
    top: 0;
    left: 28px;
    width: 4px;
    height: 100%;
    background-color: var(--color-border);
    border-radius: 2px;
  }

  .journey__timeline-nodes {
    flex-direction: column;
    gap: var(--space-md);
  }

  .journey__node {
    flex-direction: row;
    gap: var(--space-sm);
  }

  .journey__node-year {
    min-width: 40px;
    text-align: right;
  }

  /* Mobile nav */
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

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

  .nav__links li {
    width: 100%;
  }

  .nav__links a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    text-align: center;
    font-size: 1rem;
  }

  .nav__links a:hover {
    background-color: var(--color-bg-secondary);
  }
}

/* ===========================
   Responsive — Mobile (390px)
   =========================== */
@media (max-width: 390px) {
  :root {
    --space-xl: 48px;
    --space-lg: 32px;
    --space-md: 16px;
  }

  .hero__avatar {
    width: 96px;
    height: 96px;
  }

  .hero__headline {
    font-size: 1.5rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.625rem;
  }

  .project-card__body {
    padding: var(--space-sm) var(--space-sm) var(--space-md);
  }

  .about__text p {
    font-size: 1rem;
  }

  .journey__chart-iframe {
    height: 320px;
  }

  .life__grid {
    grid-template-columns: 1fr;
    grid-auto-rows: 200px;
  }

  .life__item--tall {
    grid-row: span 1;
  }

  .life__item--wide {
    grid-column: span 1;
  }

  .resume__download {
    padding: 12px 24px;
    font-size: 0.875rem;
  }

  /* Journey — mobile */
  .journey__stats {
    grid-template-columns: 1fr;
  }

  .journey__stat-number {
    font-size: 2rem;
  }

  .journey__places-iframe {
    height: 320px;
  }
}