/* ============================================================
   Matthew Miemiec — Academic Portfolio
   Minimalist editorial design
   Typefaces: Newsreader (display serif) · Inter (body) · IBM Plex Mono (labels)
   ============================================================ */

/* ===== Theme Tokens ===== */
:root {
  --color-background: #faf9f6;
  --color-foreground: #1d1b17;
  --color-muted-foreground: #6e695f;
  --color-border: #e5e2da;
  --color-accent: #175f7d;
  --color-accent-soft: rgba(23, 95, 125, 0.08);
  --color-ring: #1d1b17;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #171512;
    --color-foreground: #ece8e0;
    --color-muted-foreground: #a09a8e;
    --color-border: #2e2b25;
    --color-accent: #8ec7dc;
    --color-accent-soft: rgba(142, 199, 220, 0.1);
    --color-ring: #ece8e0;
  }
}

:root.light {
  --color-background: #faf9f6;
  --color-foreground: #1d1b17;
  --color-muted-foreground: #6e695f;
  --color-border: #e5e2da;
  --color-accent: #175f7d;
  --color-accent-soft: rgba(23, 95, 125, 0.08);
  --color-ring: #1d1b17;
}

:root.dark {
  --color-background: #171512;
  --color-foreground: #ece8e0;
  --color-muted-foreground: #a09a8e;
  --color-border: #2e2b25;
  --color-accent: #8ec7dc;
  --color-accent-soft: rgba(142, 199, 220, 0.1);
  --color-ring: #ece8e0;
}

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

html {
  background-color: var(--color-background);
  color: var(--color-foreground);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection {
  background-color: var(--color-accent);
  color: var(--color-background);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

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

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

/* Gentle page entrance */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main {
  animation: rise 0.5s ease-out;
}

/* ===== Layout ===== */
.container {
  max-width: 44rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

main {
  flex: 1;
}

/* ===== Skip Link (Accessibility) ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  background-color: var(--color-foreground);
  color: var(--color-background);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: 0 0 0.375rem 0.375rem;
  font-weight: 500;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-ring);
}

/* ===== Header / Navigation ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--color-border);
  background-color: color-mix(in srgb, var(--color-background) 82%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.site-header nav {
  max-width: 44rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

/* Wordmark */
.site-name {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: color 0.2s;
}

.site-name:hover {
  color: var(--color-accent);
}

.nav-right {
  display: flex;
  align-items: center;
}

/* Mobile-first: primary nav hidden behind the hamburger button */
.nav-links {
  display: none;
  align-items: center;
}

@media (max-width: 767px) {
  .nav-links.open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 0.5rem 1.25rem 1.25rem;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 0.75rem 1.5rem rgba(0, 0, 0, 0.1);
  }
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--color-muted-foreground);
  padding: 0.375rem 0.625rem;
  border-radius: 0.375rem;
  transition: color 0.2s;
}

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

.nav-links a.active {
  color: var(--color-foreground);
  font-weight: 500;
}

.nav-divider {
  margin: 0 0.5rem;
  height: 1.25rem;
  width: 1px;
  background-color: var(--color-border);
}

@media (max-width: 767px) {
  .nav-divider {
    display: none;
  }
}

/* Hamburger (mobile only) */
.nav-toggle {
  width: 2rem;
  height: 2rem;
  margin-left: 0.5rem;
  border-radius: 9999px;
  border: 1px solid var(--color-border);
  background: var(--color-background);
  color: var(--color-foreground);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s;
}

.nav-toggle:hover {
  border-color: var(--color-foreground);
}

.nav-toggle:focus-visible,
.theme-toggle-btn:focus-visible {
  outline: 2px solid var(--color-ring);
  outline-offset: 2px;
}

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

/* Theme toggle */
.theme-toggle-btn {
  width: 2rem;
  height: 2rem;
  border-radius: 9999px;
  border: 1px solid var(--color-border);
  background: var(--color-background);
  color: var(--color-foreground);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s;
}

.theme-toggle-btn:hover {
  border-color: var(--color-foreground);
}

.theme-toggle-btn svg {
  width: 1rem;
  height: 1rem;
}

/* ===== Home — Hero ===== */
.hero {
  padding-top: 4.5rem;
  padding-bottom: 4rem;
}

@media (min-width: 768px) {
  .hero {
    padding-top: 6rem;
    padding-bottom: 5.5rem;
  }
}

.hero-layout {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
}

.hero-portrait {
  width: 12.5rem;
  flex-shrink: 0;
  border-radius: 0.75rem;
  overflow: hidden;
  border: 1px solid var(--color-border);
  aspect-ratio: 4 / 5;
}

.hero-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  min-width: 0;
}

.profile-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 2.5rem;
  line-height: 1.1;
  letter-spacing: -0.015em;
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 3.25rem;
  }
}

.hero h1 em {
  font-style: italic;
  color: var(--color-accent);
}

.hero-description {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-muted-foreground);
  max-width: 54ch;
  margin-top: 1.5rem;
}

.hero-description strong {
  color: var(--color-foreground);
  font-weight: 500;
}

/* ===== Social Links (shared — identical set on every page) ===== */
.social-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.125rem;
  margin-top: 1.75rem;
  list-style: none;
  padding: 0;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  color: var(--color-muted-foreground);
  transition: color 0.2s, transform 0.2s;
}

.social-links a:hover {
  color: var(--color-accent);
  transform: translateY(-1px);
}

.social-links svg {
  height: 20px;
  width: 20px;
}

/* ===== News Section ===== */
.news-section {
  margin-top: 1rem;
  margin-bottom: 5rem;
}

.news-header {
  border-top: 1px solid var(--color-border);
  padding-top: 2.5rem;
  margin-bottom: 2.25rem;
}

.news-header h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.375rem;
  letter-spacing: -0.01em;
}

.news-list {
  display: grid;
  gap: 2rem;
  list-style: none;
}

.news-item {
  display: grid;
  gap: 0.25rem 2rem;
}

@media (min-width: 768px) {
  .news-item {
    grid-template-columns: 7rem 1fr;
  }
}

.news-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted-foreground);
  padding-top: 0.3rem;
  white-space: nowrap;
}

.news-item-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  line-height: 1.4;
  font-weight: 500;
}

.news-body {
  margin-top: 0.3rem;
  font-size: 0.925rem;
  line-height: 1.7;
  color: var(--color-muted-foreground);
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.site-footer .footer-inner {
  max-width: 44rem;
  margin-left: auto;
  margin-right: auto;
  padding: 1.75rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  justify-content: space-between;
  align-items: baseline;
}

@media (min-width: 768px) {
  .site-footer .footer-inner {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.site-footer p {
  font-size: 0.8125rem;
  color: var(--color-muted-foreground);
}

.site-footer .footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

/* ===== Inner Pages (About / CV / Contact) ===== */
.page {
  padding-top: 3.5rem;
  padding-bottom: 5rem;
}

@media (min-width: 768px) {
  .page {
    padding-top: 4.5rem;
  }
}

.page-header {
  margin-bottom: 1.75rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-muted-foreground);
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--color-accent);
}

.page-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 2.25rem;
  letter-spacing: -0.015em;
  margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
  .page-title {
    font-size: 2.75rem;
  }
}

.page-subtitle {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-muted-foreground);
  max-width: 54ch;
}

.page-subtitle strong {
  color: var(--color-foreground);
  font-weight: 500;
}

/* ===== Article Content (About) ===== */
.article {
  margin-top: 2.5rem;
}

.article > p + p {
  margin-top: 1rem;
}

.article h2 {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-top: 3rem;
  margin-bottom: 1rem;
}

.article h3 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.article p {
  line-height: 1.8;
}

.article ul {
  list-style: none;
}

.article ul.interests {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem 2rem;
}

@media (min-width: 640px) {
  .article ul.interests {
    grid-template-columns: 1fr 1fr;
  }
}

.article ul.interests li {
  display: flex;
  gap: 0.625rem;
  font-size: 0.95rem;
}

.article ul.interests li::before,
.article ul.affiliations > li::before {
  content: '';
  display: block;
  width: 0.3rem;
  height: 0.3rem;
  border-radius: 9999px;
  background-color: var(--color-accent);
  opacity: 0.55;
  margin-top: 0.55rem;
  flex-shrink: 0;
}

.article ul.affiliations > li {
  display: flex;
  gap: 0.625rem;
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.article ul.sub-affiliations {
  list-style: none;
  padding-left: 0;
  margin-top: 0.375rem;
}

.article ul.sub-affiliations li {
  display: flex;
  gap: 0.625rem;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
  color: var(--color-muted-foreground);
}

.article ul.sub-affiliations li::before {
  content: '–';
  color: var(--color-muted-foreground);
  opacity: 0.6;
  flex-shrink: 0;
}

/* Find me online */
.online-section {
  margin-top: 3rem;
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
}

.online-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.online-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
}

.online-links a {
  font-size: 0.9rem;
  color: var(--color-muted-foreground);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--color-border);
  transition: color 0.2s, text-decoration-color 0.2s;
}

.online-links a:hover {
  color: var(--color-foreground);
  text-decoration-color: var(--color-accent);
}

/* ===== CV Page ===== */
.cv-section {
  margin-top: 3rem;
}

.cv-section h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.375rem;
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.625rem;
  margin-bottom: 1.75rem;
}

.cv-entry {
  display: grid;
  gap: 0.25rem 2rem;
}

.cv-entry + .cv-entry {
  margin-top: 2.5rem;
}

@media (min-width: 768px) {
  .cv-entry {
    grid-template-columns: 8.5rem 1fr;
  }
}

.cv-period {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted-foreground);
}

@media (min-width: 768px) {
  .cv-period {
    padding-top: 0.25rem;
  }
}

.cv-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.15rem;
  line-height: 1.4;
}

.cv-subtitle {
  font-size: 0.875rem;
  color: var(--color-muted-foreground);
  margin-top: 0.2rem;
}

.cv-description {
  font-size: 0.925rem;
  line-height: 1.75;
  margin-top: 0.5rem;
  color: var(--color-muted-foreground);
}

.cv-note {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  border-radius: 9999px;
  padding: 0.2rem 0.65rem;
  margin-top: 0.625rem;
}

.cv-bullets {
  list-style: none;
  margin-top: 0.625rem;
}

.cv-bullets li {
  display: flex;
  gap: 0.625rem;
  font-size: 0.925rem;
  line-height: 1.7;
  margin-bottom: 0.3rem;
  color: var(--color-muted-foreground);
}

.cv-bullets li::before {
  content: '';
  display: block;
  width: 0.3rem;
  height: 0.3rem;
  border-radius: 9999px;
  background-color: var(--color-accent);
  opacity: 0.5;
  margin-top: 0.55rem;
  flex-shrink: 0;
}

/* ===== Contact Page ===== */
.contact-form {
  margin-top: 2.5rem;
  margin-bottom: 2.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-muted-foreground);
  margin-bottom: 0.5rem;
}

.form-input {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.925rem;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  transition: border-color 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-textarea {
  resize: vertical;
  min-height: 8rem;
}

.submit-btn {
  padding: 0.625rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 9999px;
  background-color: var(--color-foreground);
  color: var(--color-background);
  border: none;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.2s;
}

.submit-btn:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== Utility ===== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Mobile hero: portrait above text */
@media (max-width: 767px) {
  .hero-layout {
    flex-direction: column;
    gap: 2rem;
  }

  .hero-portrait {
    width: 10rem;
  }
}