/* 
 * System fonts, max-width 900px
 */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: #1a1a1a;
  background-color: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Navigation */
header {
  border-bottom: 1px solid #e5e5e5;
  padding: 1.5rem 0;
  margin-bottom: 2rem;
}

header .container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1a1a1a;
  text-decoration: none;
}

.site-title:hover {
  color: #4a4a4a;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

nav a {
  color: #4a4a4a;
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

nav a:hover,
nav a:focus {
  color: #1a1a1a;
  text-decoration: underline;
}

nav a[aria-current="page"] {
  color: #1a1a1a;
  font-weight: 500;
}

/* Main Content */
main {
  padding: 1rem 0 3rem;
  min-height: calc(100vh - 200px);
}

/* Typography */
h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: #1a1a1a;
  line-height: 1.3;
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: #1a1a1a;
  border-bottom: 1px solid #e5e5e5;
  padding-bottom: 0.5rem;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: #2a2a2a;
}

p {
  margin-bottom: 1rem;
  color: #2a2a2a;
}

/* Links */
a {
  color: #2563eb;
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

/* Home Page Specific */
.profile-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (min-width: 600px) {
  .profile-section {
    flex-direction: row;
    align-items: flex-start;
  }
}

.profile-photo {
  width: 150px;
  height: 150px;
  border-radius: 4px;
  object-fit: cover;
  border: 1px solid #e5e5e5;
  flex-shrink: 0;
}

.profile-info {
  flex: 1;
}

.profile-info h1 {
  margin-bottom: 0.5rem;
}

.profile-subtitle {
  color: #6a6a6a;
  font-size: 1rem;
  margin-bottom: 1rem;
}

/* About Section */
.about-text {
  text-align: justify;
}

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

/* External Links */
.external-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.external-links a {
  color: #4a4a4a;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.external-links a:hover {
  color: #1a1a1a;
}


/* External links (icon + text) - icon colored, text neutral  and subtle hover lift*/
.external-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

/* whole link block */
.external-links .external-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: #4a4a4a;            /* text color */
  font-size: 0.95rem;
  transition: transform .12s ease, color .12s ease;
}

/* hover lift (same motion as footer icons) */
.external-links .external-link:hover,
.external-links .external-link:focus {
  transform: translateY(-3px);
  color: #1a1a1a;
  outline: none;
}

/* icon sizing — brand classes (gmail/linkedin/github) color the icon itself */
.external-links .icon-link {
  font-size: 1.1rem;
  line-height: 1;
  vertical-align: middle;
  display: inline-flex;
}

/* ensure the brand color on <i> overrides anchor text color */
.external-links .icon-link.gmail { color: #D14836; }
.external-links .icon-link.linkedin { color: #0A66C2; }
.external-links .icon-link.github { color: #181717; }


/* CV Page */
.cv-section {
  margin-bottom: 2rem;
}

.cv-item {
  margin-bottom: 1.5rem;
  padding-left: 0;
}

.cv-item-header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

@media (min-width: 600px) {
  .cv-item-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
  }
}

.cv-item-title {
  font-weight: 600;
  color: #1a1a1a;
}

.cv-item-date {
  color: #6a6a6a;
  font-size: 0.9rem;
}

.cv-item-subtitle {
  color: #4a4a4a;
  font-style: italic;
  margin-bottom: 0.5rem;
}

.cv-item ul {
  margin-left: 1.25rem;
  color: #3a3a3a;
}

.cv-item li {
  margin-bottom: 0.35rem;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  list-style: none;
  margin-left: 0;
}

.skills-list li {
  background: #f5f5f5;
  padding: 0.25rem 0.75rem;
  border-radius: 3px;
  font-size: 0.9rem;
  color: #3a3a3a;
}

.download-link {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: #f5f5f5;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
  color: #2a2a2a;
  font-size: 0.9rem;
  transition: background 0.2s ease;
}

.download-link:hover {
  background: #eaeaea;
  text-decoration: none;
}

/* Thesis Page */
.thesis-status {
  background: #f9f9f9;
  border-left: 3px solid #6a6a6a;
  padding: 0.75rem 1rem;
  margin-bottom: 2rem;
  font-style: italic;
  color: #5a5a5a;
}

.abstract {
  background: #fafafa;
  padding: 1.25rem;
  border-radius: 4px;
  margin-bottom: 2rem;
}

.abstract h2 {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
}

/* Math Display */
.math-display {
  overflow-x: auto;
  padding: 1rem 0;
}

/* Figures */
figure {
  margin: 2rem 0;
  text-align: center;
}

figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
}

figcaption {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: #5a5a5a;
  text-align: left;
  padding: 0 1rem;
}

/* Code/Data Section */
.code-note {
  background: #f5f5f5;
  padding: 1rem;
  border-radius: 4px;
  font-size: 0.9rem;
  margin-top: 2rem;
}

.code-note code {
  background: #eaeaea;
  padding: 0.1rem 0.3rem;
  border-radius: 2px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85rem;
}

/* Footer */
/* Accessibility: visually-hide text but keep for screen readers */
.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* Icon baseline */
.social-icons {
  display: inline-flex;
  gap: 0.6rem;
  align-items: center;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.25rem;
  transition: transform .12s ease, opacity .12s;
  color: inherit;
}

.icon-link i {
  font-size: 1.25rem;
  line-height: 1;
  vertical-align: middle;
}

.icon-link:hover {
  transform: translateY(-3px);
  opacity: 0.9;
}

/* Brand colors */
.icon-link.gmail { color: #D14836; }      /* Gmail red */
.icon-link.linkedin { color: #0A66C2; }   /* LinkedIn blue */
.icon-link.github { color: #181717; }     /* GitHub dark */

/* Small helper used in other places; kept for compatibility */
.contact-text .icon-link {
  margin-right: 0.35rem;
  font-size: 1rem;
  vertical-align: middle;
}

/* Footer layout */
footer {
  border-top: 1px solid #e5e5e5;
  padding: 1.5rem 0;
  margin-top: 3rem;
}

/* Primary footer container: copyright left, icons right.
   flex-wrap: nowrap + white-space: nowrap prevent icons dropping below copyright.
*/
.container.footer-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: nowrap;
  padding: 0; /* use existing .container horizontal padding */
}

/* compatibility if markup uses .footer-content (older variant) */
.footer-content {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: #6a6a6a;
}

@media (min-width: 600px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .footer-content .footer-left,
  .footer-content .footer-right {
    display: flex;
    align-items: center;
    gap: 1rem;
  }
}

/* copyright text */
.footer-flex .copyright,
.footer-content .copyright {
  margin: 0;
  font-size: 0.95rem;
  color: #333;
  min-width: 0; /* allow shrinking on small widths */
}

/* Right-side social / contact icons */
.footer-flex .social-icons,
.footer-content .social-icons {
  display: inline-flex;
  gap: 0.6rem;
  align-items: center;
  white-space: nowrap; /* prevent breaking within icon group */
}

/* compact icon link (icon only) */
.footer-flex .icon-link,
.footer-content .icon-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  font-size: 1rem;
  transition: transform .12s ease, opacity .12s ease;
  line-height: 1;
  color: inherit;
}

/* Hover & focus affordances */
.footer-flex .icon-link:hover,
.footer-flex .icon-link:focus,
.footer-content .icon-link:hover,
.footer-content .icon-link:focus {
  transform: translateY(-3px);
  opacity: 0.95;
  outline: none;
}

/* Accessible focus ring */
.footer-flex .icon-link:focus-visible,
.footer-content .icon-link:focus-visible {
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
  border-radius: 6px;
}

/* Footer link base colors (fallback for non-icon links) */
.footer-links a {
  color: #5a5a5a;
  font-size: 0.85rem;
}

.footer-links a:hover {
  color: #1a1a1a;
}

/* Small-screen fallback: stack vertically and center */
@media (max-width: 600px) {
  .container.footer-flex {
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    text-align: center;
  }

  .footer-flex .social-icons,
  .footer-content .social-icons {
    order: 2;
  }

  .footer-flex .copyright,
  .footer-content .copyright {
    order: 1;
  }

  .footer-flex .icon-link,
  .footer-content .icon-link {
    padding: 0.25rem; /* larger tap targets */
  }
}

/* Publications List */
.publication-list {
  list-style: none;
  margin-left: 0;
}

.publication-list li {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  position: relative;
}

.publication-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #6a6a6a;
}

/* Accessibility */
:focus {
  outline: 2px solid #2563eb;
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid #2563eb;
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  header, footer, nav {
    display: none;
  }
  
  main {
    padding: 0;
  }
  
  a {
    color: #1a1a1a;
  }
  
  .container {
    max-width: 100%;
    padding: 0;
  }
}


/*
   Contact-page
   scoped under .contact-page to avoid global overrides
*/

.contact-page {
  --accent: #1f6feb;
  --muted: #6b7280;
  --radius: 8px;
  --maxwidth: 920px;
}

/* container adjustments only for contact page */
.contact-page .container {
  max-width: var(--maxwidth);
  padding: 0 1rem;
}

/* contact navigation tweaks */
.contact-page .site-nav {
  gap: 1rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

/* page headings */
.contact-page .page-title {
  font-size: 1.6rem;
  font-weight: 600;
  margin: 0.1rem 0 0.6rem 0;
}
.contact-page .page-sub {
  color: var(--muted);
  margin: 0 0 1rem 0;
  font-size: 0.95rem;
}

/* contact card */
.contact-page .contact-card {
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  background: transparent;
  border: 1px solid #f2f2f2;
  margin-bottom: 1rem;
}

/* form layout */
.contact-page .form-row {
  display: flex;
  gap: 1rem;
}
.contact-page .form-col { flex: 1; min-width: 0; }

.contact-page label {
  display:block;
  font-size:0.92rem;
  margin-bottom:0.35rem;
  color:inherit;
}

/* contact inputs*/
.contact-page input[type="text"],
.contact-page input[type="email"],
.contact-page textarea {
  width:100%;
  padding:0.6rem 0.65rem;
  border-radius:6px;
  border:1px solid #cfcfcf;
  background:#fff;
  font-size:0.95rem;
  color:inherit;
  transition: border-color 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

/* subtle but clear focus state: stronger accent and soft shadow */
.contact-page input:focus,
.contact-page textarea:focus {
  border-color: rgba(31,107,235,0.6);
  box-shadow: 0 6px 18px rgba(31,107,235,0.08);
  outline: none;
}

/* slightly darker placeholder for legibility*/
.contact-page input::placeholder,
.contact-page textarea::placeholder {
  color: #8b8b8b;
}

/* textarea size */
.contact-page textarea { min-height:140px; resize:vertical; }

/* helper */
.contact-page .helper { font-size:0.85rem; color:var(--muted); margin-top:0.4rem; }

/* submit */
.contact-page .btn {
  display:inline-block;
  border:0;
  background:var(--accent);
  color:white;
  padding:0.55rem 0.9rem;
  border-radius:6px;
  cursor:pointer;
  font-weight:600;
  font-size:0.95rem;
}
.contact-page .btn:disabled { opacity:0.55; cursor:not-allowed; }

/* message area */
.contact-page .message {
  margin-top:0.9rem;
  font-size:0.95rem;
  padding:0.8rem;
  border-radius:6px;
}
.contact-page .message.success{
  color: #064e3b;
  background: #ecfdf5;
  border: 1px solid #bbf7d0;
}
.contact-page .message.error{
  color: #7f1d1d;
  background: #fff1f2;
  border: 1px solid #fecaca;
}
.contact-page .message.warn{
  color: #5b4b00;
  background: #fffbeb;
  border: 1px solid #fef3c7;
}

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

/* small print */
.contact-page .small { color:var(--muted); font-size:0.88rem; }

/* responsive */
@media (max-width:720px){
  .contact-page .form-row { flex-direction: column; }
}