/*
  Minimal, modern, accessible CSS for Emad Deilam Salehi — Health Informatics
  Features: CSS variables, dark mode, responsive grid, subtle motion
*/

:root {
  --bg: #0b1020;
  --surface: #10172a;
  --text: #e5e7eb;
  --muted: #a3a9b6;
  --accent: #60a5fa;
  --accent-strong: #3b82f6;
  --border: #23314f;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

.light {
  --bg: #ffffff;
  --surface: #f6f8fb;
  --text: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --border: #e2e8f0;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Poppins", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: min(1100px, 92vw);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in lab, var(--bg) 80%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.2px;
}
.brand span { color: var(--accent); }

.site-nav { position: relative; }
.nav-toggle {
  display: none;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 18px;
  align-items: center;
  margin: 0;
  padding: 0;
}
.nav-list a { color: var(--text); text-decoration: none; }
.nav-list a:hover { color: var(--accent); }

.cv-link {
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 10px;
}

.theme-toggle {
  display: grid;
  grid-auto-flow: column;
  place-items: center;
  gap: 4px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 999px;
}
.theme-toggle:hover { box-shadow: var(--shadow); }

.section { padding: 64px 0; }
.section.alt { background: var(--surface); }
.section h2 { margin: 0 0 18px 0; }
.section .lead { font-size: 1.12rem; color: var(--muted); }

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  align-items: center;
}
.hero-copy h1 { font-size: clamp(1.8rem, 3.5vw, 3rem); margin: 0 0 12px; }
.accent { color: var(--accent); }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}
.btn.primary { background: var(--accent); border-color: transparent; color: white; }
.btn.subtle { background: transparent; }
.btn:hover { box-shadow: var(--shadow); }

.profile-card {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, color-mix(in lab, var(--surface), transparent 10%), color-mix(in lab, var(--bg), transparent 10%));
}
.avatar { font-size: 40px; display: grid; place-items: center; }
.profile-card .name { font-weight: 700; }
.profile-card .role { color: var(--muted); margin-bottom: 8px; font-size: 0.9rem; }
.tags { list-style: none; display: flex; gap: 8px; padding: 0; margin: 0 0 8px 0; flex-wrap: wrap; }
.tags li { border: 1px solid var(--border); padding: 4px 8px; border-radius: 999px; font-size: 12px; color: var(--muted); }
.social { display: flex; gap: 12px; }
.profile-card .social { margin-top: 20px; }
.social a { color: var(--accent); text-decoration: none; display: inline-flex; align-items: center; }
.social img { width: 22px; height: 22px; display: block; filter: invert(72%) sepia(12%) saturate(2465%) hue-rotate(189deg) brightness(98%) contrast(93%); }
.light .social img { filter: none; }
/* Increase only the GitHub icon size */
.social a[aria-label="GitHub"] img { width: 30px; height: 30px; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  background: var(--bg);
}

.section-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.controls { display: flex; align-items: center; gap: 10px; }
.controls input[type="search"], .controls select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
}
.segmented { display: flex; gap: 10px; background: var(--bg); border: 1px solid var(--border); padding: 8px; border-radius: 12px; }
.segmented input { accent-color: var(--accent); }

.pubs-list { padding-left: 20px; }
.pubs-list li { margin-bottom: 12px; }
.pub-title { font-weight: 600; }
.pub-meta { color: var(--muted); font-size: 0.95rem; }
.pub-links { display: inline-flex; gap: 8px; margin-left: 8px; }
.pub-links a { color: var(--accent); text-decoration: none; }

.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip { border: 1px solid var(--border); border-radius: 999px; padding: 6px 10px; cursor: pointer; background: var(--bg); color: var(--muted); }
.chip.active { background: var(--accent); color: white; border-color: transparent; }

.projects-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.project-card { border: 1px solid var(--border); border-radius: 16px; overflow: hidden; background: var(--bg); display: grid; grid-template-rows: 160px auto; }
.project-thumb { background: linear-gradient(135deg, var(--accent), transparent), url('../assets/placeholder.svg'); background-size: cover; }
.project-body { padding: 14px; }
.project-title { margin: 0 0 6px 0; font-weight: 600; }
.project-desc { color: var(--muted); font-size: 0.95rem; }
.project-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.project-tags span { font-size: 12px; border: 1px solid var(--border); border-radius: 999px; padding: 4px 8px; color: var(--muted); }
.project-links { display: flex; gap: 10px; margin-top: 10px; }
.project-links a { color: var(--accent); text-decoration: none; }

.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.contact-card { border: 1px solid var(--border); border-radius: 16px; padding: 16px; background: var(--bg); }

.site-footer { border-top: 1px solid var(--border); padding: 32px 18px; text-align: center; color: var(--muted); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(10px); transition: opacity .5s ease, transform .6s cubic-bezier(.2,.8,.2,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1000px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .hero-grid { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-block; }
  .nav-list { position: absolute; right: 0; top: 42px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 12px; display: none; flex-direction: column; align-items: flex-start; }
  .nav-list.open { display: flex; }
  .card-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}