/* ==========================================================================
   Personal website styles — minimal, academic
   Tweak the variables below to re-theme the whole site.
   ========================================================================== */

:root {
  --bg: #ffffff;
  --text: #222222;
  --text-muted: #666666;
  --link: #1a5fb4;
  --link-hover: #0d3b78;
  --border: #e5e5e5;
  --accent-bg: #f7f7f7;
  --max-width: 42rem;
  --font-body: "Charter", "Georgia", "Cambria", serif;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 17px;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word; /* long URLs/words never force horizontal scroll */
}

img,
svg {
  max-width: 100%;
  height: auto;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

/* --- Header / nav ------------------------------------------------------- */

header.site-header {
  max-width: var(--max-width);
  margin: 0 auto 2.5rem;
  padding: 2.5rem 1.25rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.5rem;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-ui);
}

nav.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.95rem;
}

nav.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  padding-bottom: 2px;
}

nav.site-nav a:hover {
  color: var(--text);
}

nav.site-nav a.active {
  color: var(--text);
  border-bottom: 2px solid var(--text);
}

/* --- Typography --------------------------------------------------------- */

h1 {
  font-size: 1.6rem;
  line-height: 1.25;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.2rem;
  margin: 2.25rem 0 0.75rem;
}

h3 {
  font-size: 1rem;
  margin: 1.5rem 0 0.25rem;
}

p {
  margin: 0 0 1rem;
}

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

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

ul {
  padding-left: 1.25rem;
  margin: 0 0 1rem;
}

li {
  margin-bottom: 0.35rem;
}

code {
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  font-size: 0.85em;
  background: var(--accent-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.muted {
  color: var(--text-muted);
}

.small {
  font-size: 0.88rem;
}

/* --- About page --------------------------------------------------------- */

.about-intro {
  display: flex;
  gap: 1.75rem;
  align-items: flex-start;
}

.about-intro-text {
  flex: 1;
  min-width: 0;
}

.about-intro-text p:first-child {
  margin-top: 0;
}

.about-photo {
  margin: 0.25rem 0 0;
  flex: 0 0 12rem;
  width: 12rem;
}

.about-photo img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
}

.about-photo figcaption {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
  text-align: center;
}

.contact-links {
  font-family: var(--font-ui);
  font-size: 0.92rem;
  margin-bottom: 1.75rem;
}

.sep {
  color: var(--text-muted);
  margin: 0 0.6rem;
}

.entry {
  margin-bottom: 1.4rem;
}

.entry-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.entry-title {
  font-weight: 600;
}

.entry-org {
  color: var(--text-muted);
}

.entry-date {
  color: var(--text-muted);
  font-size: 0.88rem;
  white-space: nowrap;
  font-family: var(--font-ui);
}

.entry-details {
  margin: 0.3rem 0 0;
  color: var(--text);
}

/* --- Course reviews ----------------------------------------------------- */

.legend {
  margin-top: -0.5rem;
}

.legend .course-rating {
  margin-right: 0.15rem;
}

/* Category index at the top of the page */
.category-index {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0 2.5rem;
  background: var(--accent-bg);
}

.category {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.75rem;
  align-items: baseline;
  padding: 0.35rem 0;
}

.category + .category {
  border-top: 1px solid var(--border);
}

.category-name {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.9rem;
  flex: 0 0 13rem;
}

.category-codes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.85rem;
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  font-size: 0.82rem;
}

/* Semester groupings */
.semester-heading {
  font-size: 1.15rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
  margin: 2.5rem 0 1.25rem;
}

.course {
  margin-bottom: 1.75rem;
}

.course-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem 1rem;
  flex-wrap: wrap;
}

.course-title {
  display: inline;
}

.course-rating {
  color: #d4a017;
  margin-right: 0.15rem;
}

.course-code {
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-right: 0.4rem;
}

.course-name {
  font-weight: 600;
}

.course-instructor {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.course-review {
  margin: 0.35rem 0 0;
}

/* --- Projects ----------------------------------------------------------- */

.project {
  margin-bottom: 2rem;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.project-name {
  font-weight: 600;
  font-size: 1.05rem;
}

.project-name a {
  color: var(--text);
}

.project-name a:hover {
  color: var(--link);
}

.project-tech {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.project-description {
  margin: 0.4rem 0 0;
}

.project-links {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  display: flex;
  gap: 1rem;
}

.project-links a {
  color: var(--link);
}

.project-links a::before {
  content: "→ ";
  color: var(--text-muted);
}

/* --- Footer ------------------------------------------------------------- */

footer.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-family: var(--font-ui);
}

/* --- Responsive ---------------------------------------------------------
   The main column caps at --max-width, so on tablets the layout is already
   the same centered column as desktop with side margins. The breakpoints
   below mainly reflow the few side-by-side pieces (photo, category index,
   headers with a right-aligned date) once there's no longer room for them.
   ------------------------------------------------------------------------ */

/* Tablet / small laptop: shrink the fixed-width about photo a touch. */
@media (max-width: 768px) {
  .about-photo {
    flex-basis: 10.5rem;
    width: 10.5rem;
  }

  .category-name {
    flex-basis: 11rem;
  }
}

/* Phones */
@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  .container {
    padding-left: 1.1rem;
    padding-right: 1.1rem;
  }

  header.site-header {
    padding: 1.75rem 1.1rem 1.25rem;
    margin-bottom: 2rem;
  }

  nav.site-nav {
    gap: 0.6rem 1.25rem;
  }

  nav.site-nav a {
    padding: 0.2rem 0; /* roomier tap targets */
  }

  h1 {
    font-size: 1.45rem;
  }

  /* Stack the title and its right-aligned date/instructor vertically. */
  .entry-header,
  .course-header,
  .project-header {
    flex-direction: column;
    gap: 0.1rem;
  }

  .course-instructor {
    white-space: normal;
  }

  /* Category index: name on its own line above the codes. */
  .category {
    flex-direction: column;
    gap: 0.15rem;
  }

  .category-name {
    flex-basis: auto;
  }

  /* About: photo stacks above the intro text. */
  .about-intro {
    flex-direction: column;
    gap: 1.25rem;
  }

  .about-photo {
    flex-basis: auto;
    width: 60%;
    max-width: 13rem;
  }
}

/* Small phones */
@media (max-width: 380px) {
  html {
    font-size: 15px;
  }

  .about-photo {
    width: 72%;
  }
}