/* Minimal modern academic site styles - mobile first */

/* =========================
   THEME + TYPOGRAPHY
   ========================= */
:root{
  --bg: #FAFBFB;
  --card: #FFFFFF;
  --text: #0F1724;      /* near-black */
  --muted: #6B7280;     /* gray */
  --accent: #2F6F9F;
  --link-color: #6878AE;    /* hyperlinks */
  --icon-color: #EFCED1;    /* icons and buttons */
  --button-bg: var(--icon-color); /* button background (can differ in dark mode) */
  --radius: 12px;
  --max-width: 1400px;
  --section-alt: #F4F6F7;
  --aside-width: 360px;
  --header-bg: rgba(255,255,255,0.96);
  --toggle-bg: transparent;
  --toggle-border: transparent;

  /* NEW: form field + borders (so dark mode can tone down white fields) */
  --form-field: #FFFFFF;
  --input-border: rgba(12,20,30,0.06);
  --card-border: rgba(12,20,30,0.04);

  /* Fonts */
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-head: "Google Sans", "Product Sans", "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* CV timeline geometry */
  --cv-line-x: 10px;           /* move line further left */
  --cv-dot-size: 14px;
  --cv-dot-border: 3px;
  --cv-left-pad: 4rem;         /* add more padding so logos/text never overlap the line */
}

*{box-sizing:border-box}
html,body{height:100%}

body{
  margin:0;
  font-family: var(--font-body);
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.5;
  scroll-behavior:smooth;
}

/* Headings / titles use Google Sans */
h1,h2,h3,.brand,.name{
  font-family: var(--font-head);
}

/* Global hyperlink styling */
a{
  color:var(--link-color);
  text-decoration:underline;
  transition:opacity 0.2s ease;
}
a:hover{
  opacity:0.8;
}

.container{max-width:var(--max-width);margin:0 auto;padding:1.25rem}
.header-inner{display:flex;align-items:center;gap:0.5rem}

.skip-link{position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:1rem;top:1rem;width:auto;height:auto;padding:.5rem .75rem;background:#000;color:#fff;border-radius:6px}

/* =========================
   HEADER / NAV
   ========================= */
.site-header{
  position:fixed;top:0;left:0;right:0;
  backdrop-filter: blur(6px);
  z-index:9999;
  background:var(--header-bg);
  box-shadow:0 1px 0 rgba(12,20,30,0.04);
}
.site-header .container{
  display:flex;align-items:center;justify-content:space-between;
  padding:.6rem 1.25rem;
}
.brand{
  font-size:1.15rem;
  text-decoration:none;
  color:var(--text);
  font-weight:700;
}
.nav-toggle{display:inline-flex;background:none;border:0;padding:.25rem;color:var(--icon-color)}
.nav-toggle:focus{outline:2px solid var(--icon-color);outline-offset:3px}

.site-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:1rem}
.site-nav a{color:var(--text);text-decoration:none;font-weight:500;padding:.25rem}
.site-nav a:hover{color:var(--link-color);opacity:1}
.site-nav a.active{
  color:var(--link-color);
  font-weight:700;
  border-bottom:2px solid var(--link-color);
  padding-bottom:.35rem;
}

/* Responsive header */
@media (max-width:700px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;right:1.25rem;top:64px;
    background:var(--card);
    box-shadow:0 8px 20px rgba(11,17,24,0.06);
    border-radius:10px;
    padding:.75rem;
    display:none;
  }
  .site-nav[data-open="true"]{display:block}
  .site-nav ul{flex-direction:column}
}
@media (min-width:701px){
  .nav-toggle{display:none}
  .site-nav{display:block}
}

/* Ensure main content isn't hidden under fixed header */
main{padding-top:4.2rem}

/* =========================
   SECTIONS / LAYOUT
   ========================= */
.section{padding:3rem 0;transition:background-color .35s ease}
main > .section{background:var(--card)}
main > .section:nth-of-type(even){background:var(--section-alt)}

/* Section titles slightly larger and scale when revealed */
.container h2{
  margin-top:0;margin-bottom:1rem;
  font-size:2rem;
  transition:transform .28s ease,color .2s ease;
}
.reveal.is-visible .container h2{
  transform:scale(1.06);
  color:var(--text);
}

.name{font-weight:700;font-size:2.2rem}
.lead{color:var(--muted);font-size:1.05rem;max-width:55ch}

/* Generic two-column section grid */
.section-grid{display:block}
@media(min-width:800px){
  .section-grid{
    display:grid;
    grid-template-columns:var(--aside-width) 1fr;
    gap:2rem;
    align-items:start;
  }
  .section-left{
    padding-top:0;
    display:flex;
    align-items:flex-start;
    justify-content:flex-start;
  }
  .section-left h2{
    margin:0;
    padding-left:1rem;
    font-size:1.6rem;
    text-align:left;
  }
  .section-right{padding-top:0}
}
@media(max-width:799px){
  .section-left h2{margin-bottom:0.75rem}
}

/* =========================
   ABOUT
   ========================= */
.section.about{padding-top:0;padding-bottom:3rem}

/* Legacy grid-about (kept if referenced somewhere) */
.grid-about{
  display:grid;
  grid-template-columns:1fr;
  gap:1.5rem;
  align-items:center;
  margin-top:-10rem;
}
@media(min-width:900px){
  .grid-about{grid-template-columns:360px 1fr;gap:2rem}
}

/* Profile image */
.profile-img{
  width:240px;height:240px;
  object-fit:cover;
  border-radius:50%;
  display:block;
  margin:0 auto;
  box-shadow:0 6px 20px rgba(12,20,30,0.06);
  border:2px solid rgba(15,23,36,0.04);
}

/* About layout override */
.section.about .section-grid{
  display:grid;
  grid-template-columns:360px 1fr;
  gap:2rem;
  align-items:start;
}
.section.about .section-left{align-items:flex-start}

@media(max-width:900px){
  .section.about .section-grid{display:block}
  .profile-img{width:160px;height:160px;margin:0 auto}
}

/* Center profile column contents so social links align under the image */
.section.about .about-left{
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  width:100%;
}
.section.about .about-left .social-links{
  justify-content:center;
  width:100%;
  display:flex;
}
.section.about .about-left .role{margin-top:0.5rem}

/* Right column tweaks */
.about-right{padding:0}
.research-list{padding-left:1rem}

/* Highlight box */
.look-highlight{
  margin-top:1rem;
  padding:14px;
  border-radius:10px;
  background:rgba(47,111,159,0.06);
  border-left:4px solid rgba(47,111,159,0.9);
}
@media(hover:hover) and (pointer:fine){
  .look-highlight{transition:transform .22s ease,box-shadow .22s ease}
  .look-highlight:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(14,30,45,0.06)}
}

/* =========================
   CARDS / NEWS
   ========================= */
.cards{display:grid;gap:1rem}
.news-grid{grid-template-columns:1fr;}
@media(min-width:800px){
  .news-grid{grid-template-columns:repeat(3,1fr)}
}
.card{
  background:var(--card);
  padding:1rem;
  border-radius:10px;
  box-shadow:0 4px 14px rgba(11,17,24,0.04);
  border:1px solid var(--card-border); /* make card stand out from section */
}
.card h3{margin:.25rem 0}
.meta{color:var(--muted);font-size:.9rem}
.excerpt{color:var(--muted);margin-bottom:.5rem}
.read-more{color:var(--link-color);text-decoration:none}

/* =========================
   CV / EDUCATION TIMELINE
   ========================= */

/* Timeline container: add left padding so line/dot never overlap content */
.cv-list{
  display:flex;
  flex-direction:column;
  gap:1rem;
  position:relative;
  padding-left:0; /* Remove left padding, timeline is now on the right side of content */
}

/* Vertical line - positioned to avoid overlap with logos */
.cv-list::before{
  content:"";
  position:absolute;
  left:0;
  top:10px;
  bottom:10px;
  width:2px;
  background: linear-gradient(to bottom, rgba(47,111,159,0.35), rgba(47,111,159,0.12));
  border-radius:2px;
}

/* Each item */
.cv-item{
  position:relative;
  display:block;
  padding:0 0 1rem 1.5rem; /* Add left padding to make room for timeline */
  margin-left:0;
  border-radius:10px;
  background:transparent;
  transition:background .18s ease,border-left .18s ease;
  border-bottom:1px solid rgba(12,20,30,0.03);
}
.cv-item:hover{background:rgba(47,111,159,0.02)}

/* Dot marker aligned to the line - positioned on the left edge */
.cv-item::after{
  content:"";
  position:absolute;
  left: calc(-1 * (var(--cv-dot-size) / 2 + var(--cv-dot-border)) + 1px);
  top:22px;
  width:var(--cv-dot-size);
  height:var(--cv-dot-size);
  border-radius:50%;
  background:#fff;
  border: var(--cv-dot-border) solid var(--accent);
  z-index:1;
}

/* ---- IMPORTANT: constrain logo size on ALL screen sizes (prevents huge logos) ---- */
.cv-left img.cv-logo{
  width:44px;
  height:44px;
  object-fit:contain;
  border-radius:8px;
  box-shadow:0 1px 2px rgba(0,0,0,0.06);
  display:block;
}

/* Align logo with CV head text block */
.cv-right .cv-head{
  display:flex;
  flex-direction:row;
  align-items:center; /* vertically center logo with text block */
  gap:0.75rem;
}
.cv-right .cv-head img.cv-logo{
  width:52px;
  height:52px;
  object-fit:contain;
  border-radius:8px;
  box-shadow:0 1px 2px rgba(0,0,0,0.06);
  flex:0 0 auto;
}

/* Ensure the text block stacks nicely next to the logo */
.cv-right .cv-head .cv-head-text{
  display:flex;
  flex-direction:column;
  justify-content:center;
}

@media(min-width:800px){
  .cv-item{
    display:flex;
    align-items:flex-start; /* don't center against bullet text */
    gap:1rem;
    padding-left:1.5rem; /* space for timeline dot */
  }

  /* logo column */
  .cv-left{
    display:flex;
    flex:0 0 64px;
    align-items:flex-start; /* default */
    justify-content:center;
    padding-top:2px;
  }

  /* If you have .cv-head wrapping the 3 lines, center logo to that block */
  .cv-right .cv-head{
    min-height:64px;
    display:flex;
    flex-direction:row;
    align-items:center; /* vertically center logo with text block */
    gap:0.75rem;
  }
  .cv-right .cv-head img.cv-logo{
    width:64px;
    height:64px;
  }

  .cv-logo-inline{display:none}
}

/* Mobile: keep inline logo version (no left logo) */
@media(max-width:799px){
  .cv-left{display:none}
  .cv-logo-inline{display:inline-block}
}

/* Typography: FINAL single source of truth (no duplicates later) */
.cv-position{
  margin:0 0 0.18rem;
  color:#374151;       /* dark gray */
  font-weight:700;     /* bold */
  font-size:0.95rem;
  line-height:1.15;
}
.cv-company{
  margin:0 0 0.35rem;
  color:var(--text);   /* black */
  font-weight:400;     /* not bold */
  font-size:0.98rem;
}
.cv-meta{
  margin:0 0 0.5rem;
  font-size:0.86rem;
  color:#374151;       /* dark gray */
  font-weight:400;     /* not bold */
  display:block;
}

/* Keep body text under entries black, but don't override the three header lines */
.cv-right p:not(.cv-position):not(.cv-company):not(.cv-meta),
.cv-right li{
  font-size:0.9rem;
  color:var(--text);
  margin:0 0 0.45rem;
}

/* Inline logo styling (used on small screens) */
.cv-logo-inline{
  width:40px;
  height:40px;
  object-fit:contain;
  vertical-align:middle;
  margin-right:0.75rem;
  border-radius:6px;
  box-shadow:0 1px 2px rgba(0,0,0,0.06);
  display:inline-block;
}

/* (Optional) cv-date class if you use it somewhere */
.cv-date{
  font-size:0.95rem;
  color:var(--muted);
  white-space:nowrap;
  display:block;
  text-align:center;
  max-width:220px;
  overflow:visible;
}

/* Adjust timeline for narrower widths so it stays out of the way */
@media(max-width:900px){
  :root{
    --cv-line-x: 12px;
    --cv-left-pad: 3rem;
  }
  .cv-item{
    padding-left:1.25rem;
  }
}

/* On very small screens hide the decorative timeline (your original behavior) */
@media(max-width:700px){
  .cv-list::before{display:none}
  .cv-item::after{display:none}
  .cv-list{padding-left:0}
}

/* =========================
   PUBLICATIONS
   ========================= */
.pub-row{display:flex;gap:1rem;align-items:flex-start;flex-direction:row-reverse}
.pub-thumb{
  width:320px;height:180px;
  border-radius:8px;
  overflow:hidden;
  flex:0 0 320px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:#000;
}
.pub-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.pub-content{flex:1}
.pub-summary{color:var(--muted);margin:0 0 0.5rem}
.pub-authors{font-size:0.9rem;color:var(--text);margin:0.5rem 0 0.25rem}
.pub-venue{font-size:0.85rem;color:var(--muted);margin:0.25rem 0 0.5rem}
.pub-links{margin-top:0.75rem}
.pub-paper-link{
  display:inline-flex;
  align-items:center;
  gap:0.35rem;
  padding:0.4rem 0.75rem;
  background:var(--button-bg);
  color:var(--text);
  text-decoration:none;
  border-radius:6px;
  font-size:0.85rem;
  font-weight:500;
  transition:opacity 0.2s ease;
}
.pub-paper-link:hover{opacity:0.85}
@media(max-width:900px){
  .pub-row{flex-direction:column}
  .pub-thumb{width:100%;height:auto}
}

/* Video placeholder styles */
.pub-video{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  pointer-events:none;
}
.pub-thumb .pub-video{width:100%;height:100%;pointer-events:none}

/* =========================
   SOCIAL LINKS
   ========================= */
.social-links{
  margin-top:0.5rem;
  display:flex;
  gap:1rem;
  flex-wrap:wrap;
  justify-content:center;
}
.social-link{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:0;
  color:var(--icon-color);
  text-decoration:none;
  border-radius:6px;
  line-height:1;
}
.social-link svg{width:40px;height:40px;display:block;fill:currentColor}
.social-link:hover{color:var(--icon-color);opacity:0.8;transform:none}
.social-link:focus{
  outline:2px solid var(--icon-color);
  outline-offset:3px;
  border-radius:6px;
}

/* =========================
   CONTACT
   ========================= */
.contact-form{display:flex;flex-direction:column;gap:0.75rem;width:100%}
.contact-card{
  background:var(--card);
  padding:1rem;
  border-radius:12px;
  box-shadow:0 8px 20px rgba(11,17,24,0.04);
  width:100%; /* ensure the card can expand to available column width */
}
.contact-card .social-links{margin-bottom:0.75rem;justify-content:flex-start}
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea{
  width:100%;
  padding:0.6rem;
  border-radius:8px;
  border:1px solid var(--input-border);
  font-size:0.95rem;
  background:var(--form-field); /* use variable so dark mode can tone this down */
  color:var(--text);
}
.contact-form label{font-size:0.95rem}
.button{
  background:var(--button-bg);
  color:var(--text);
  border:0;
  padding:.6rem .9rem;
  border-radius:8px;
  cursor:pointer;
  text-decoration:none;
  display:inline-block;
  width:auto; /* only make full-width where appropriate (see .contact-form .button) */
  text-align:center;
}
.button:hover{opacity:0.85;text-decoration:none}

/* Ensure form submit/button spans full width inside the contact form (preserve previous behavior) */
.contact-form .button{width:100%}

/* Body copy inherits Inter (body font) */
.about-right p,.about-right li,.lead{font-family:inherit}

/* =========================
   ACCESSIBILITY + MOTION
   ========================= */
@media(prefers-reduced-motion:reduce){
  .reveal{transition:none;transform:none}
  .social-link,.look-highlight{transition:none}
}
.sr-only{
  position:absolute!important;
  height:1px;width:1px;
  overflow:hidden;
  clip:rect(1px, 1px, 1px, 1px);
  white-space:nowrap;
}

/* Ensure CV heads and titles use the Google Sans head font */
.cv-right .cv-head,
.cv-position,
.cv-company,
.cv-meta,
.card h3{
  font-family: var(--font-head);
}

/* About: use head font for role under profile and align tops */
.role{font-family: var(--font-head);}
.section.about .section-grid{align-items:start}
.section.about .about-left,
.section.about .about-right{display:flex;flex-direction:column;align-items:flex-start}
.section.about .about-right .name{margin-top:0}

/* =========================
   DOCUMENT DOWNLOAD BUTTONS
   ========================= */
/* Small row of download buttons used under profile and in CV section */
.doc-buttons{
  display:flex;
  gap:0.6rem;
  align-items:center;
  justify-content:center;
  margin-top:0.75rem;
  flex-wrap:wrap;
}

/* Individual download button */
.doc-button{
  display:inline-flex;
  align-items:center;
  gap:0.5rem;
  padding:0.4rem 0.75rem;
  background:var(--button-bg);
  color:var(--text);
  text-decoration:none;
  border-radius:8px;
  font-size:0.9rem;
  font-weight:600;
  border:0;
}
.doc-button svg{width:18px;height:18px;flex:0 0 auto}
.doc-button:hover{opacity:0.9}

/* On larger screens keep the doc-buttons aligned to the left in CV section (so they don't collide with timeline) */
@media(min-width:800px){
  .section#cv .doc-buttons{justify-content:flex-start}
}

/* Theme toggle button */
.theme-toggle{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:.35rem;
  margin-left:.25rem;
  border-radius:8px;
  background:var(--toggle-bg);
  border:1px solid var(--toggle-border);
  color:var(--icon-color);
  cursor:pointer;
  box-shadow:0 2px 6px rgba(11,17,24,0.04);
}
.theme-toggle .icon{width:20px;height:20px;display:block}
.theme-toggle .moon{display:none}
.theme-toggle[aria-pressed="true"] .sun{display:none}
.theme-toggle[aria-pressed="true"] .moon{display:block}

/* Dark mode variables (defaults to light) */
@media (prefers-color-scheme: dark) {
  :root{
    --bg: #0B1220;
    --card: #081018;
    --text: #E6EEF8;
    --muted: #9BA9C7;
    --accent: #59A6D6;
    --link-color: #EFCED1; /* user wanted links color */
    --icon-color: #C5CEE3; /* icons/buttons color */
    --button-bg: #8FA0B8; /* slightly darker button color for dark mode */
    --section-alt: #07101a; /* slightly different from card */
    --header-bg: rgba(4,8,12,0.6);
    --toggle-bg: rgba(255,255,255,0.04);
    --toggle-border: rgba(255,255,255,0.06);

    /* tone down bright white form fields in dark mode */
    --form-field: rgba(230,238,248,0.04); /* very subtle light overlay */
    --input-border: rgba(255,255,255,0.04);
    --card-border: rgba(255,255,255,0.04);
  }
}

body.dark{
  --bg: #0B1220;
  --card: #081018;
  --text: #E6EEF8;
  --muted: #9BA9C7;
  --accent: #59A6D6;
  --link-color: #EFCED1;
  --icon-color: #C5CEE3;
  --button-bg: #8FA0B8; /* explicit dark toggle uses darker button bg */
  --section-alt: #07101a; /* slightly darker than card for alternating sections */
  --header-bg: rgba(4,8,12,0.6);
  --toggle-bg: rgba(255,255,255,0.04);
  --toggle-border: rgba(255,255,255,0.06);

  /* tone down bright white form fields when using explicit dark toggle */
  --form-field: rgba(230,238,248,0.04);
  --input-border: rgba(255,255,255,0.04);
  --card-border: rgba(255,255,255,0.04);
}

/* Ensure links and icon colors follow requested palette */
a{color:var(--link-color)}
.social-link{color:var(--icon-color)}
.button, .doc-button, .pub-paper-link{background:var(--button-bg);color:var(--text)}

/* Tweak alternating section background to use variable so dark mode changes it */
main > .section{background:var(--card)}
main > .section:nth-of-type(even){background:var(--section-alt)}

/* Make header text/icon color adapt to theme */
.site-header .container{background:transparent}
.brand{color:var(--text)}
.nav-toggle{color:var(--icon-color)}