/*
  RCC's portfolio: style.css
  -------------------------------
  This controls how the page looks. 
*/

/* ==== 1. Design tokens ====
  "Variables" you can reuse everywhere. Change a color here and it updates across the whole site. */
:root {
  --paper:  #FFFFFF; 
  --ink:    #1D2629;
  --muted:  #5A686B;
  --rule:   #D5DAD4;
  --accent: #436b9c;
  --accent-soft:  #a6b7f7;

  --font-heading: 'Trebuchet MS', sans-serif;
  --font-body: "Intrument Sans", "Segoe UI", system-ui, sans-serif; 

  --measure: 20rem; 
}
/* ===== 2. Base styles ===== */

/* Makes width calculations include padding and borders (easier to reason about) */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;       /* smooth scrolling when nav links are clicked */
  scroll-padding-top: 5rem;      /* stops the sticky header from covering section titles */
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;          /* 17px */
  line-height: 1.6;
}

/* Turn off smooth scrolling for people who prefer less motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}

a:hover {
  text-decoration-thickness: 2px;
}

/* A clear outline when someone navigates with the keyboard (accessibility) */
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.15;
  margin: 0;
}

/* ===== 3. Navigation bar ===== */
.site-header {
  position: sticky;               /* stays at the top while scrolling */
  top: 0;
  z-index: 10;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.nav {
  margin: 0;
  padding: 0 2.5rem;
  display: flex;                  /* puts the name and links side by side */
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-name {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  color: var(--ink);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.25rem;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

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

/* ===== 4. Main layout ===== */
main {
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== 5. Intro (the first thing visitors see) =====
   This is the one "big" moment on the page: a large name and a short statement. */
.intro {
  padding: 5rem 0 3.5rem;
}

.intro h1 {
  font-size: clamp(2.75rem, 9vw, 5rem);  /* grows with screen size, within limits */
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.intro-lead {
  font-size: 1.25rem;
  line-height: 1.55;
  max-width: 34rem;
  margin: 0 0 2rem;
}

.intro-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0;
}

/* The two intro links styled as simple buttons */
.intro-links a {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

.intro-links a:first-child {
  background: var(--accent);
  color: var(--paper);
}

.intro-links a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

/* ===== 6. Sections ===== */
.section {
  padding: 3rem 0;
  border-top: 1px solid var(--rule);
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.section p {
  margin: 0 0 1rem;
}

/* ===== 7. Entries (research projects, roles, etc.) =====
   A thin plum line on the left ties each entry together. */
.entry {
  padding-left: 1.25rem;
  border-left: 2px solid var(--accent-soft);
  margin-bottom: 2rem;
}

.entry:last-child {
  margin-bottom: 0;
}

.entry h3 {
  font-size: 1.35rem;
  margin-bottom: 0.25rem;
}

.entry-meta {
  color: var(--muted);
  font-size: 0.925rem;
  margin-bottom: 0.5rem !important;
}

/* ===== 8. Contact ===== */
.contact-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  gap: 0.5rem;
}

/* ===== 9. Footer ===== */
.site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.875rem;
}

/* ===== 10. Small screens (phones) ===== */
@media (max-width: 34rem) {
  .intro { padding-top: 3rem; }
  .nav-links { gap: 0.9rem; font-size: 0.9rem; }
}