/* ==================================================================
   CUSTOMIZE HERE
   Change colors, fonts, and sizes in this block. Everything else
   in the file reads from these variables.
   ================================================================== */
:root {
  /* Fonts */
  --font-body: "AR PL UKai CN", "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --font-heading: "Manrope", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;

  /* Colors (light) */
  --bg: #ffffff;
  --sidebar-bg: #f6f7f8;
  --ink: #1c1e22;
  --muted: #6a6f78;
  --line: #e2e4e8;
  --accent: #2b4fb3;

  /* Layout */
  --sidebar-w: 300px;
  --content-w: 700px;
  --headshot-size: 120px;
  --headshot-radius: 50%;   /* 50% = circle, 8px = rounded square, 0 = square */

  /* Motion */
  --fade-time: 0.9s;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121316;
    --sidebar-bg: #17181c;
    --ink: #e8e9ec;
    --muted: #9296a0;
    --line: #2a2c32;
    --accent: #8aa4ff;
  }
}

/* To make "AR PL UKai CN" show for every visitor (not just people who have it
   installed), download the font file, put it in an /assets/fonts folder,
   check its license, then uncomment this block:

@font-face {
  font-family: "AR PL UKai CN";
  src: url("assets/fonts/ukai.ttc") format("truetype");
  font-display: swap;
}
*/

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0;
}

p { margin: 0 0 1.1em; }

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 4px;
  transition: text-decoration-color 0.2s, color 0.2s;
}
a:hover { color: var(--accent); text-decoration-color: var(--accent); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ==================================================================
   SIDEBAR
   ================================================================== */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  padding: 56px 36px 36px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.headshot {
  display: block;
  width: var(--headshot-size);
  height: var(--headshot-size);
  object-fit: cover;
  border-radius: var(--headshot-radius);
  margin-bottom: 24px;
}

.name {
  font-size: 1.6rem;
  margin-bottom: 10px;
}

.tagline {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
  margin: 0;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 44px;
}

.nav a {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--muted);
  text-decoration: none;
  padding: 4px 0 4px 14px;
  border-left: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.nav a:hover { color: var(--ink); }
.nav a.active {
  color: var(--ink);
  border-left-color: var(--accent);
}

.social {
  margin-top: auto;
  padding-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 0.85rem;
}
.social a { color: var(--muted); }
.social a:hover { color: var(--accent); }

/* ==================================================================
   MAIN CONTENT
   ================================================================== */
.main {
  margin-left: var(--sidebar-w);
  padding: 0 64px;
}

.main > section {
  max-width: var(--content-w);
  padding: 96px 0 40px;
}
.main > section:first-child { padding-top: 120px; }

.hero {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  max-width: 24em;
}

.section-title {
  font-size: 1.5rem;
  margin-bottom: 36px;
}

/* Projects */
.project {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.project:last-child { border-bottom: 1px solid var(--line); }

.project h3 {
  font-size: 1.15rem;
  margin-bottom: 14px;
}

dl { margin: 0; }

.project dl {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 8px 20px;
}
.project dt,
.skills dt {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--muted);
}
.project dd,
.skills dd { margin: 0; }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 18px 0 0;
  font-size: 0.9rem;
}

/* Experience */
.entry {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 4px 20px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.entry:last-of-type { border-bottom: 1px solid var(--line); }
.entry-when {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 3px 0 0;
}
.entry h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}
.entry p:last-child { margin-bottom: 0; }

/* Skills */
.skills {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 10px 20px;
}

.footer {
  max-width: var(--content-w);
  padding: 72px 0 48px;
  color: var(--muted);
  font-size: 0.8rem;
}

/* ==================================================================
   BANNER
   ================================================================== */
.banner {
  position: relative;
  height: 280px;
  margin: 0 -64px;            /* stretches past the main padding to the edges */
  background: var(--line);    /* shows if the image is missing */
  overflow: hidden;
}

.banner > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;          /* crops instead of stretching */
  object-position: center;    /* try "center top" or "center 30%" to shift the crop */
}

/* Dark gradient at the bottom so the tagline stays readable on any photo */
.banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.55), rgba(0, 0, 0, 0) 60%);
  pointer-events: none;
}

.banner-content {
  position: absolute;
  left: 64px;
  bottom: 32px;
  z-index: 1;                 /* keeps it above the gradient */
  display: flex;
  align-items: center;
  gap: 16px;
  color: #fff;                /* the icon uses currentColor, so this colors it too */
}

.banner-icon {
  flex: none;                 /* stops the icon from shrinking */
  width: 30px;
  height: 30px;
}

.banner-tagline {
  margin: 0;
  max-width: 28em;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(1.3rem, 2.6vw, 1.9rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

/* The first section after the banner doesn't need as much top space */
.banner + section { padding-top: 64px; }

/* ==================================================================
   FADE-IN (titles)
   Add class="fade" to any element. Headings are hidden only when
   JavaScript is running, so the page still works without it.
   ================================================================== */
.js .fade {
  opacity: 0;
  transition: opacity var(--fade-time) ease;
}
.js .fade.visible { opacity: 1; }

/* The opening headline gets a slightly slower fade */
.js .hero.fade { transition-duration: 1.4s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .fade { opacity: 1; transition: none; }
}

/* ==================================================================
   MOBILE: sidebar becomes a header at the top
   ================================================================== */
@media (max-width: 860px) {

    .banner { height: 200px; margin: 0 -24px; }
  .banner-content { left: 24px; bottom: 20px; gap: 12px; }
  .banner-icon { width: 20px; height: 20px; }
  .sidebar {
    position: static;
    width: 100%;
    padding: 36px 24px 24px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .profile {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 20px;
    align-items: center;
  }
  .headshot { --headshot-size: 88px; grid-row: span 2; margin: 0; }
  .name { font-size: 1.35rem; margin-bottom: 4px; align-self: end; }
  .tagline { align-self: start; }

  .nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px 16px;
    margin-top: 24px;
  }
  .nav a { padding: 4px 0; border-left: 0; border-bottom: 2px solid transparent; }
  .nav a.active { border-bottom-color: var(--accent); }

  .social { padding-top: 20px; margin-top: 0; }

  .main { margin-left: 0; padding: 0 24px; }
  .main > section { padding-top: 64px; }
  .main > section:first-child { padding-top: 56px; }

  .project dl,
  .skills,
  .entry { grid-template-columns: 1fr; gap: 2px; }
  .project dd, .skills dd { margin-bottom: 8px; }
}