/* --- Amy Chen — Blue palette --- */
:root {
  --bg: #F5F8FF;
  --bg-secondary: #E0E9F8;
  --bg-panel: #E0E9F8;
  --border: #C5D3E8;
  --text: #1E2D4A;
  --text-heading: #1E2D4A;
  --text-dark: #1E2D4A;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-dim: rgba(37, 99, 235, 0.12);
  --accent-soft: #BFDBFE;
  --sage: #7AA2C8;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
  --transition: 0.2s ease;
  --nav-height: 72px;
  --max-width: 1000px;
  --radius: 4px;
  --left-panel-width: 36%;
  --left-panel-min: 280px;
  --left-panel-max: 380px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.01em;
}

/* Skip to content (a11y) */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: #F5F8FF;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius);
  z-index: 100;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 1rem;
}

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

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* --- Two-column layout --- */
.layout {
  display: flex;
  min-height: 100vh;
}

.left-panel {
  position: sticky;
  top: 0;
  width: var(--left-panel-width);
  min-width: var(--left-panel-min);
  max-width: var(--left-panel-max);
  height: 100vh;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem 2.5rem;
  border-right: 1px solid var(--border);
  background: var(--bg-panel);
}

.panel-photo-wrap {
  width: clamp(140px, 18vw, 200px);
  margin-bottom: 1.5rem;
  flex-shrink: 0;
  cursor: pointer;
  will-change: transform;
}

.panel-photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: block;
}

.panel-greeting {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  line-height: 1.2;
  text-align: center;
  color: var(--text-heading);
}

.panel-tagline {
  font-size: clamp(0.9rem, 1.8vw, 1.15rem);
  font-weight: 500;
  color: var(--text);
  margin: 0;
  text-align: center;
  font-family: var(--font-mono);
  display: inline-block;
  cursor: default;
  transition: transform 0.1s ease-out;
}

.panel-tagline:hover {
  animation: jump-around 0.5s steps(1) infinite;
}

@keyframes jump-around {
  0%, 100% { transform: translate(0, 0); }
  12.5% { transform: translate(28px, -20px); }
  25% { transform: translate(-24px, 32px); }
  37.5% { transform: translate(36px, 16px); }
  50% { transform: translate(-32px, -24px); }
  62.5% { transform: translate(20px, 28px); }
  75% { transform: translate(-28px, -16px); }
  87.5% { transform: translate(16px, -32px); }
}

.panel-linkedin {
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--sage);
  text-decoration: none;
}

.panel-linkedin:hover {
  color: var(--accent);
  text-decoration: underline;
}

.right-panel {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.right-panel main {
  flex: 1;
}

/* --- Header & Nav --- */
.header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: rgba(245, 248, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-list a {
  color: var(--text-heading);
  font-size: 0.9rem;
  font-family: var(--font-mono);
  text-decoration: none;
  transition: color var(--transition);
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--accent);
  text-decoration: none;
}

.nav-number {
  color: var(--accent);
  margin-right: 0.25rem;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--accent);
}

@media (max-width: 900px) {
  .layout {
    flex-direction: column;
  }

  .left-panel {
    position: relative;
    width: 100%;
    min-width: 0;
    max-width: none;
    height: auto;
    min-height: 40vh;
    padding: 3rem 1.5rem;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .panel-name {
    font-size: clamp(2.25rem, 8vw, 3rem);
  }

  .right-panel main {
    padding-top: 2rem;
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .nav.open {
    display: block;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    padding: 2rem;
    background: var(--bg-secondary);
  }

  .nav.open .nav-list {
    flex-direction: column;
    gap: 1rem;
  }

  .menu-toggle {
    display: flex;
  }

  main {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}

/* --- Main content --- */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 2rem;
  padding-top: 3rem;
  padding-bottom: 6rem;
}

/* --- Hero --- */
.hero {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 2rem 0;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.hero-desc {
  max-width: 540px;
  margin: 0 0 2rem 0;
  font-size: 1.1rem;
  color: var(--text);
}

.btn-cta {
  display: inline-block;
  padding: 0.9rem 1.5rem;
  font-size: 0.9rem;
  font-family: var(--font-mono);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition);
  width: fit-content;
}

.btn-cta:hover {
  background: var(--accent-dim);
  color: var(--accent-hover);
  border-color: var(--accent-hover);
  text-decoration: none;
}

/* --- Sections --- */
.section {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 2.5rem;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--sage);
}

/* --- About --- */
.about-content {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  margin: 0 0 1rem 0;
}

.about-text a {
  color: var(--accent);
}

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

.about-list {
  margin: 1rem 0 0 0;
  padding-left: 1.25rem;
  color: var(--text);
}

.about-list li {
  margin-bottom: 0.5rem;
}

.about-image {
  position: relative;
}

.image-wrapper {
  width: 200px;
  aspect-ratio: 1;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  will-change: transform;
}

.about-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (max-width: 768px) {
  .about-content {
    grid-template-columns: 1fr;
  }

  .about-image {
    order: -1;
    justify-self: start;
  }

  .image-wrapper {
    width: 160px;
  }
}

/* --- Experience --- */
.jobs {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.job {
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--border);
}

.job:hover {
  border-left-color: var(--accent);
}

.job-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.job-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-heading);
  margin: 0;
}

.job-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
}

.job-company {
  margin: 0 0 0.75rem 0;
  font-size: 0.95rem;
}

.job-company a {
  color: var(--accent);
}

.job-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text);
}

.job-list li {
  margin-bottom: 0.5rem;
}

/* --- Skills --- */
.skills-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.75rem;
  list-style: none;
  margin: 0 0 2rem 0;
  padding: 0;
}

.skills-list li {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text);
  padding: 0.5rem 0;
  padding-left: 1.25rem;
  position: relative;
}

.skills-list li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.education {
  max-width: 600px;
  font-size: 0.95rem;
  color: var(--text);
  margin: 0;
  line-height: 1.8;
}

/* --- Contact --- */
.contact-section {
  text-align: center;
  padding: 6rem 0;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.contact-heading {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--text-heading);
  margin: 0 0 1rem 0;
}

.contact-desc {
  max-width: 480px;
  margin: 0 auto 2rem;
  color: var(--text);
}

.btn-email {
  display: inline-block;
  padding: 1rem 1.5rem;
  font-size: 1rem;
  font-family: var(--font-mono);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition);
  margin-bottom: 2rem;
}

.btn-email:hover {
  background: var(--accent-dim);
  color: var(--accent-hover);
  border-color: var(--accent-hover);
  text-decoration: none;
}

.contact-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.contact-links a {
  color: var(--text);
}

.contact-links a:hover {
  color: var(--accent-hover);
}

/* --- Footer --- */
.footer {
  text-align: center;
  padding: 2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text);
}

.footer p {
  margin: 0;
}