/* ==========================================================
   Prof. Prabhat Mittal — academic profile site
   Blue theme, matching the Call for Book Chapters site.
   ========================================================== */

:root {
  --navy: #154360;
  --blue: #1f497d;
  --blue-light: #d5e4f3;
  --blue-pale: #eef4fb;
  --ground: #f7f9fc;
  --ink: #283647;
  --muted: #5d6b7a;
  --gold: #f0b429;
  --button: #007bff;
  --button-hover: #00008b;
  --line: #dbe4ee;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 70px; }

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--ground);
  color: var(--ink);
  line-height: 1.65;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
p, li { font-size: 1rem; }

.wrap { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* ---------- Top bar ---------- */
.topbar { position: sticky; top: 0; z-index: 40; background: var(--navy); box-shadow: 0 2px 6px rgba(0,0,0,.15); }
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 58px; flex-wrap: wrap; }
.topbar .brand { color: #fff; font-weight: 700; letter-spacing: .3px; }
.topbar .brand:hover { text-decoration: none; }
.topbar nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 2px; margin: 0; padding: 0; }
.topbar nav a { display: block; padding: 8px 12px; color: #cfe0f1; border-radius: 6px; font-size: .95rem; }
.topbar nav a:hover { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; }
.topbar nav a.active { background: var(--blue); color: #fff; }

/* ---------- Hero ---------- */
.hero { background: linear-gradient(135deg, #154360 0%, #1f497d 100%); color: #fff; padding: 42px 0; }
.hero .wrap { display: flex; gap: 30px; align-items: center; flex-wrap: wrap; }
.hero img.portrait {
  width: 170px; height: 200px; object-fit: cover; object-position: top center;
  border: 4px solid rgba(255,255,255,.35); border-radius: 10px; background: #fff; flex: 0 0 auto;
}
.hero h1 { margin: 0 0 6px; font-size: 2rem; font-family: Georgia, 'Times New Roman', serif; }
.hero .role { margin: 0 0 10px; font-size: 1.05rem; color: #dce8f4; }
.hero .tagline { margin: 0 0 14px; color: #cfe0f1; max-width: 640px; }
.hero .hero-text { flex: 1 1 420px; }

.idlinks { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.idlinks a {
  background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.3);
  color: #fff; padding: 4px 12px; border-radius: 999px; font-size: .86rem;
}
.idlinks a:hover { background: rgba(255,255,255,.26); text-decoration: none; }

/* ---------- Page header (inner pages) ---------- */
.page-head { background: var(--navy); color: #fff; padding: 28px 0; }
.page-head h1 { margin: 0 0 6px; font-size: 1.7rem; font-family: Georgia, 'Times New Roman', serif; }
.page-head p { margin: 0; color: #dce8f4; max-width: 760px; }

/* ---------- Sections ---------- */
section.block { padding: 40px 0; }
section.block.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { color: var(--blue); border-bottom: 3px solid var(--blue); padding-bottom: 5px; font-size: 1.5rem; margin: 0 0 18px; }
h3 { color: var(--navy); font-size: 1.12rem; margin: 0 0 8px; }

.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); }
.grid.fixed-2 { grid-template-columns: repeat(2, 1fr); }
.grid.fixed-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .grid.fixed-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid.fixed-3 { grid-template-columns: 1fr; } }
@media (max-width: 700px) { .grid.fixed-2 { grid-template-columns: 1fr; } }

.card {
  background: #fff; border: 1px solid var(--blue-light); border-radius: 8px;
  padding: 18px 20px; box-shadow: 0 1px 3px rgba(21,67,96,.06);
}
.card.accent { border-left: 6px solid var(--blue); }
.card p:last-child { margin-bottom: 0; }

.highlight { background: var(--blue-pale); border-left: 5px solid var(--blue); padding: 12px 16px; margin: 16px 0; }
.note { color: var(--muted); font-size: .93rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; background: var(--button); color: #fff; font-weight: bold;
  padding: 10px 18px; border-radius: 10px; box-shadow: 0 3px 7px rgba(0,0,0,.18);
  transition: background .25s ease, transform .2s ease;
}
.btn:hover { background: var(--button-hover); color: #fff; text-decoration: none; transform: scale(1.03); }
.btn.gold { background: var(--gold); color: #1b2a3a; }
.btn.gold:hover { background: #ffc94d; color: #1b2a3a; }
.btn.ghost { background: transparent; border: 2px solid #fff; box-shadow: none; }
.btn.ghost:hover { background: rgba(255,255,255,.15); }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }

/* ---------- Lists ---------- */
ul.checks { list-style: none; padding: 0; margin: 0; }
ul.checks li { position: relative; padding: 5px 0 5px 26px; }
ul.checks li::before { content: "\2713"; position: absolute; left: 0; top: 5px; color: var(--blue); font-weight: bold; }

ul.refs { list-style: none; padding-left: 0; margin: 0; }
ul.refs li { padding-left: 2em; text-indent: -2em; margin-bottom: 10px; }
ul.refs a { word-break: break-word; }

/* ---------- Timeline (projects) ---------- */
.project { border-left: 4px solid var(--blue-light); padding: 0 0 18px 18px; position: relative; }
.project::before {
  content: ""; position: absolute; left: -9px; top: 6px; width: 14px; height: 14px;
  background: var(--blue); border-radius: 50%; border: 3px solid #fff;
}
.project .years { font-weight: bold; color: var(--blue); font-size: .9rem; letter-spacing: .5px; }
.project h3 { margin: 2px 0 4px; font-size: 1.05rem; }
.project p { margin: 0; color: var(--muted); font-size: .95rem; }

/* ---------- Book card (cover + text) ---------- */
.book-card { display: flex; gap: 18px; align-items: flex-start; }
.book-card img {
  width: 120px; flex: 0 0 auto; border: 1px solid var(--line);
  border-radius: 4px; box-shadow: 0 2px 8px rgba(21,67,96,.18);
}
.book-card h3 { margin-top: 0; }
.book-card .sub { color: var(--muted); margin-top: 0; }
.book-card.feature { align-items: center; padding: 22px; }
.book-card.feature img { width: 132px; }
@media (max-width: 560px) { .book-card { flex-direction: column; } .book-card img { width: 110px; } }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; }
.stat { background: #fff; border: 1px solid var(--blue-light); border-radius: 8px; padding: 14px; text-align: center; }
.stat .num { display: block; font-size: 1.7rem; font-weight: bold; color: var(--blue); }
.stat .lbl { font-size: .9rem; color: var(--muted); }
.stats.two-col { grid-template-columns: repeat(2, 1fr); }

/* ---------- Tables ---------- */
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { border: 1px solid var(--blue-light); padding: 9px 12px; text-align: left; font-size: .97rem; }
th { background: var(--blue-light); color: var(--navy); }

/* ---------- Footer ---------- */
footer.site-footer { background: var(--navy); color: #cfe0f1; padding: 24px 0; font-size: .93rem; }
footer.site-footer a { color: #fff; }
footer.site-footer .cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
footer.site-footer h4 { margin: 0 0 6px; color: #fff; font-size: 1rem; }

/* ---------- Mobile ---------- */
@media (max-width: 820px) {
  .topbar .wrap { min-height: 0; padding-top: 8px; padding-bottom: 8px; }
  .topbar nav ul { gap: 0; }
  .hero { padding: 28px 0; }
  .hero img.portrait { width: 130px; height: 155px; }
  .hero h1 { font-size: 1.5rem; }
}