/* ===== Theme tokens =====
   Palette sampled from the portrait: Gran Sasso sky, mist, slate ridges, pine, navy. */
:root {
  --bg: #e8eef3;              /* morning mist */
  --sky: #c4d4e3;
  --ridge-far: #cfdbe6;
  --ridge-near: #bccbd8;
  --surface: #fbfcfd;         /* opaque fallback for panels */
  --surface-2: rgba(214, 226, 236, .55);
  --text: #1c2530;
  --muted: #56606c;
  --border: rgba(78, 100, 123, .16);
  --accent: #1f5f8b;
  --accent-soft: rgba(31, 95, 139, .10);
  --shadow: 0 1px 2px rgba(11, 39, 69, .04), 0 10px 30px rgba(11, 39, 69, .06);
  /* glass: chrome floats (more see-through), panels are for reading (denser) */
  --glass-chrome: rgba(255, 255, 255, .48);
  --glass-panel: rgba(255, 255, 255, .70);
  --glass-edge: rgba(255, 255, 255, .85);
  --radius: 14px;
  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1522; --sky: #16314d; --ridge-far: #122233; --ridge-near: #0f1c2b;
    --surface: #152131; --surface-2: rgba(255, 255, 255, .05);
    --text: #e6ebf0; --muted: #9aa7b5; --border: rgba(255, 255, 255, .08);
    --accent: #7db7e0; --accent-soft: rgba(125, 183, 224, .12);
    --shadow: 0 10px 30px rgba(0, 0, 0, .30);
    --glass-chrome: rgba(15, 26, 39, .50); --glass-panel: rgba(18, 30, 45, .70);
    --glass-edge: rgba(255, 255, 255, .07);
  }
}
:root[data-theme="dark"] {
  --bg: #0b1522; --sky: #16314d; --ridge-far: #122233; --ridge-near: #0f1c2b;
  --surface: #152131; --surface-2: rgba(255, 255, 255, .05);
  --text: #e6ebf0; --muted: #9aa7b5; --border: rgba(255, 255, 255, .08);
  --accent: #7db7e0; --accent-soft: rgba(125, 183, 224, .12);
  --shadow: 0 10px 30px rgba(0, 0, 0, .30);
  --glass-chrome: rgba(15, 26, 39, .50); --glass-panel: rgba(18, 30, 45, .70);
  --glass-edge: rgba(255, 255, 255, .07);
}

/* ===== Base ===== */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15.5px/1.65 var(--sans); -webkit-font-smoothing: antialiased;
}

/* ===== Backdrop: sky glow + Gran Sasso ridgeline, fixed behind the glass ===== */
.backdrop { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden;
  background:
    radial-gradient(60% 45% at 85% 0%, var(--sky), transparent 70%),
    radial-gradient(45% 35% at 10% 8%, var(--sky), transparent 75%);
}
.backdrop svg { position: absolute; left: 0; bottom: 0; width: 100%; height: 48vh; min-height: 260px; }
.backdrop .far { fill: var(--ridge-far); }
.backdrop .near { fill: var(--ridge-near); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; margin: 0; letter-spacing: -.005em; }
p { margin: 0 0 1em; }
ul { margin: .4em 0 0; padding-left: 1.2em; }
li { margin: .2em 0; }

.layout {
  max-width: 1180px; margin: 0 auto; padding: 56px 24px 40px;
  display: grid; grid-template-columns: 300px 1fr; gap: 32px; align-items: start;
}

main, .sidebar { min-width: 0; }
.links a, .pub-meta a { overflow-wrap: anywhere; }

/* ===== Sidebar ===== */
.sidebar {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px 24px;
  overflow: hidden;
}
/* Only pin the sidebar when the whole card fits in the viewport */
@media (min-width: 901px) and (min-height: 1000px) {
  .sidebar { position: sticky; top: 32px; }
}
/* Portrait bleeds to the card edges; Gran Sasso backdrop stays visible */
.portrait {
  display: block; width: calc(100% + 48px); height: auto;
  margin: -28px -24px 22px;
  aspect-ratio: 5 / 4; object-fit: cover; object-position: 50% 0%;
  background: var(--surface-2);
}
.sidebar h1 { font-size: 1.75rem; line-height: 1.12; }
.role { color: var(--accent); font-weight: 600; font-size: .95rem; margin: 8px 0 0; }
.intro { font: 400 1.12rem/1.4 var(--serif); margin: 6px 0 0; }
.now { color: var(--muted); font-size: .9rem; margin: 8px 0 18px; }
/* CV download */
.cv-button {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  margin: 0 0 4px; padding: 9px 14px; border-radius: 10px;
  border: 1px solid var(--accent); color: var(--accent); font-weight: 500; font-size: .92rem;
}
.cv-button:hover { background: var(--accent); color: #fff; text-decoration: none; }
.cv-button svg { width: 17px; height: 17px; }
.js .cv-button:not(.ready) { display: none; }

/* Icon row: phones only */
.quick-links { display: none; }

.side-block { border-top: 1px solid var(--border); padding-top: 16px; margin-top: 16px; }
.side-block h2 {
  font: 600 .72rem var(--sans); letter-spacing: .09em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 10px;
}
.links { list-style: none; padding: 0; margin: 0; }
.links li { margin: 6px 0; }
.links a { display: flex; align-items: center; gap: 10px; color: var(--text); font-size: .93rem; }
.links a:hover { color: var(--accent); text-decoration: none; }
.links svg { width: 17px; height: 17px; flex: none; color: var(--muted); }
.links a:hover svg { color: var(--accent); }
.lang { display: flex; justify-content: space-between; gap: 8px; font-size: .9rem; margin: 5px 0; }
.lang span:last-child { color: var(--muted); text-align: right; }
.lang-name { display: inline-flex; align-items: center; gap: 8px; }
.flag { width: 20px; height: 14px; flex: none; border-radius: 2px; box-shadow: 0 0 0 1px var(--border); }

/* ===== Theme toggle: small icon in the top-right corner ===== */
.theme-toggle {
  position: absolute; top: 12px; right: 14px; z-index: 10;
  width: 34px; height: 34px; padding: 0; border-radius: 50%;
  display: grid; place-items: center;
  border: 0; background: transparent; color: var(--muted); cursor: pointer;
  transition: color .15s, background .15s;
}
.theme-toggle:hover { color: var(--text); background: var(--glass-chrome); }
.theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.theme-toggle svg { width: 19px; height: 19px; grid-area: 1 / 1; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* ===== Publication profiles ===== */
.pub-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px 20px; margin-bottom: 16px; }
.pub-head h2 { font-size: 1.35rem; }
.profiles { display: flex; gap: 8px; flex-wrap: wrap; }
.profile {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 5px 12px 5px 8px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--text);
  font-size: .85rem; font-weight: 500;
}
.profile:hover { text-decoration: none; border-color: currentColor; }
.profile svg { width: 18px; height: 18px; flex: none; }
.profile.orcid svg { color: #a6ce39; }
.profile.scholar svg { color: #4285f4; }
.profile.dblp svg { color: #004f9f; }
:root[data-theme="dark"] .profile.dblp svg { color: #3b82c4; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .profile.dblp svg { color: #3b82c4; }
}

/* ===== Tabs ===== */
.tabs {
  display: flex; gap: 4px; padding: 5px; margin-bottom: 24px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; overflow-x: auto; scrollbar-width: none;
  position: sticky; top: 12px; z-index: 5; box-shadow: var(--shadow);
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  flex: none; border: 0; background: transparent; color: var(--muted);
  font: 500 .92rem var(--sans); padding: 9px 16px; border-radius: 8px; cursor: pointer;
  white-space: nowrap; transition: background .15s, color .15s;
}
.tab:hover { color: var(--text); background: var(--surface-2); }
.tab[aria-selected="true"] { background: var(--accent); color: #fff; }
:root[data-theme="dark"] .tab[aria-selected="true"] { color: #10161c; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .tab[aria-selected="true"] { color: #10161c; }
}

/* Panels are all visible without JS (tabs hidden); with JS only the active one shows */
.panel + .panel { margin-top: 40px; }
.js .panel { display: none; animation: fade .25s ease; }
.js .panel.active { display: block; margin-top: 0; }
html:not(.js) .tabs { display: none; }
.panel:focus { outline: none; }
.panel:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; border-radius: var(--radius); }
.tab:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { .js .panel { animation: none; } }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 28px 30px; margin-bottom: 20px;
}
.card > h2 { font-size: 1.35rem; margin-bottom: 16px; }
.lead { font-size: 1.05rem; }

/* ===== Chips ===== */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 4px 12px; border-radius: 999px; font-size: .85rem;
  background: var(--surface-2); border: 1px solid var(--border);
}
.chip.accent { background: var(--accent-soft); border-color: transparent; color: var(--accent); font-weight: 500; }


/* ===== Timeline ===== */
.timeline { position: relative; margin: 0; padding: 0; list-style: none; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px;
  width: 2px; background: var(--border);
}
.entry { position: relative; padding-left: 34px; margin-bottom: 28px; }
.entry:last-child { margin-bottom: 0; }
.entry::before {
  content: ""; position: absolute; left: 0; top: 7px; width: 16px; height: 16px;
  border-radius: 50%; background: var(--surface); border: 3px solid var(--accent);
}
.entry-head { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 4px 16px; }
.entry h3 { font-size: 1.1rem; }
.when { font-size: .85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.org { color: var(--accent); font-weight: 500; font-size: .95rem; }
.where { color: var(--muted); font-size: .9rem; }
.entry ul { color: var(--text); font-size: .95rem; }
.note { font-style: italic; color: var(--muted); margin: 4px 0 0; }

/* ===== Publications ===== */
.pub-tools { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.filters { display: flex; flex-wrap: wrap; gap: 6px; }
.filter {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  padding: 6px 13px; border-radius: 999px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); font: 500 .88rem var(--sans);
}
.filter svg { width: 14px; height: 14px; color: var(--accent); }
.filter:hover { color: var(--text); border-color: var(--accent); }
.filter[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.filter:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.search {
  flex: 1 1 280px; min-width: 0; padding: 10px 14px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text);
  font: inherit;
}
.search:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.count { color: var(--muted); font-size: .88rem; margin: 14px 0 0; }
.year { font: 500 1.3rem var(--serif); color: var(--muted); margin: 22px 0 4px; }
.year:first-child { margin-top: 10px; }
.pub { padding: 14px 0; border-bottom: 1px solid var(--border); }
.pub:last-child { border-bottom: 0; }
.pub-title { color: var(--text); font-weight: 600; }
.pub-title:hover { color: var(--accent); }
.star { width: 15px; height: 15px; color: var(--accent); margin-left: 6px; vertical-align: -2px; }
.pub-authors { font-size: .9rem; color: var(--muted); }
.pub-authors b { color: var(--text); font-weight: 600; }
.pub-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 6px; font-size: .88rem; }
.type { font-size: .76rem; font-weight: 600; padding: 1px 8px; border-radius: 6px; background: var(--surface-2); color: var(--muted); }
.type-journal { background: var(--accent-soft); color: var(--accent); }
.venue { font-weight: 600; }
.pub-meta .src { color: var(--muted); }
.empty { color: var(--muted); display: none; margin-top: 16px; }

/* ===== Skills ===== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
.grid-2 .card { margin-bottom: 0; }
.skill { margin: 12px 0; }
.skill-row { display: flex; justify-content: space-between; font-size: .93rem; }
.skill-row span:last-child { color: var(--muted); font-size: .85rem; }
.bar { height: 6px; border-radius: 6px; background: var(--surface-2); margin-top: 5px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); border-radius: 6px; }
.lvl-3 { width: 92%; } .lvl-2 { width: 62%; } .lvl-1 { width: 32%; }
.sub { font: 600 .8rem var(--sans); color: var(--muted); letter-spacing: .06em; text-transform: uppercase; margin: 18px 0 2px; }
.sub:first-of-type { margin-top: 0; }

/* Soft skills: three groups side by side, separated by a thin rule */
.grid-2.skills-grid { align-items: stretch; }
.grid-2 + .soft-skills { margin-top: 20px; }
.soft-groups { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }
.soft-groups > div { padding: 0 24px; border-left: 1px solid var(--border); }
.soft-groups > div:first-child { padding-left: 0; border-left: 0; }
.soft-groups > div:last-child { padding-right: 0; }
.soft-groups h3 { font: 600 .95rem var(--sans); margin-bottom: 12px; }
@media (max-width: 900px) {
  .soft-groups { grid-template-columns: 1fr; gap: 20px; }
  .soft-groups > div { padding: 0; border-left: 0; }
}

.list-clean { list-style: none; padding: 0; }
.list-clean li { padding: 10px 0; border-bottom: 1px solid var(--border); }
.list-clean li:last-child { border-bottom: 0; }
.list-clean small { display: block; color: var(--muted); }

footer { text-align: center; color: var(--muted); font-size: .82rem; padding: 0 24px 40px; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 54px 16px 20px; gap: 20px; }
  .sidebar { position: static; }
  .grid-2 { grid-template-columns: 1fr; }
  .card { padding: 22px 18px; }
}
@media print {
  .tabs, .theme-toggle, .pub-tools, .backdrop { display: none; }
  .panel { display: block !important; }
  .layout { display: block; }
  .sidebar { position: static; }
  .card, .sidebar { box-shadow: none; break-inside: avoid; }
}


/* ===== Projects ===== */
.project-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 6px 16px; margin-bottom: 10px; }
.project-featured .project-head h2 { font-size: 1.9rem; letter-spacing: .01em; }
.project-license { font-size: .85rem; color: var(--muted); }
.project-featured p { max-width: 68ch; }
.project-stack { margin: 4px 0 20px; }
.project-links { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  padding: 8px 14px; border-radius: 10px; font: 500 .9rem var(--sans);
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text);
}
.btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.1); color: #fff; }
:root[data-theme="dark"] .btn.primary { color: #0b1522; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn.primary { color: #0b1522; } }
.btn svg { width: 17px; height: 17px; }
.btn:focus-visible, .cv-button:focus-visible, .quick-links a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.project-list { list-style: none; padding: 0; margin: 0; }
.project-list li { padding: 14px 0; border-bottom: 1px solid var(--border); }
.project-list li:first-child { padding-top: 0; }
.project-list li:last-child { border-bottom: 0; }
.project-list p { margin: 4px 0 0; color: var(--muted); font-size: .94rem; }
.project-row { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.project-row a { font-weight: 600; font-size: 1.02rem; }
.lang-tag { font-size: .8rem; color: var(--muted); }
.more-link { margin: 14px 0 0; font-size: .92rem; }

/* ===== Compact header on phones ===== */
@media (max-width: 900px) {
  .sidebar { display: grid; grid-template-columns: 84px 1fr; gap: 0 16px; align-items: start; padding: 18px; }
  .portrait { grid-column: 1; width: 84px; height: 84px; margin: 0; border-radius: 12px; aspect-ratio: 1; }
  .identity { grid-column: 2; }
  .sidebar h1 { font-size: 1.4rem; }
  .role { margin: 4px 0 0; font-size: .88rem; line-height: 1.45; }
  .intro { font-size: 1rem; margin-top: 4px; }
  .now { font-size: .82rem; margin: 4px 0 0; }
  .cv-button, .quick-links, .sidebar .side-block { grid-column: 1 / -1; }
  .cv-button { margin-top: 16px; }
  .quick-links { display: flex; justify-content: space-between; margin-top: 14px; }
  .quick-links a { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; color: var(--muted); }
  .quick-links a:hover { color: var(--accent); background: var(--surface-2); }
  .quick-links svg { width: 20px; height: 20px; }
  .contact-block { display: none; }
  .sidebar .side-block { margin-top: 14px; padding-top: 12px; }
  .lang-block { display: grid; grid-template-columns: 1fr 1fr; gap: 2px 24px; }
  .lang-block h2 { grid-column: 1 / -1; }
  .lang { font-size: .85rem; margin: 2px 0; }
}

/* ===== Glass surfaces =====
   Two tiers: chrome (tab bar, theme toggle) is lighter and blurrier so it reads as floating;
   reading panels (sidebar, cards) stay dense enough for comfortable body text. */
@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .tabs, .theme-toggle:hover {
    background: var(--glass-chrome);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    backdrop-filter: blur(18px) saturate(180%);
  }
  .sidebar, .card {
    background: var(--glass-panel);
    -webkit-backdrop-filter: blur(14px) saturate(150%);
    backdrop-filter: blur(14px) saturate(150%);
  }
  .tabs, .sidebar, .card {
    border-color: var(--border);
    box-shadow: var(--shadow), inset 0 1px 0 var(--glass-edge);
  }
}
/* Users who ask for less transparency get solid surfaces */
@media (prefers-reduced-transparency: reduce) {
  .tabs, .sidebar, .card { background: var(--surface); -webkit-backdrop-filter: none; backdrop-filter: none; }
}