/* =========================================================================
   Professor Jagdish N. Sheth — Legacy Archive
   Design system: refined academic / editorial
   Historic palette: #496b93 (blue)  ·  #b63f4a (crimson)
   ========================================================================= */

:root{
  /* Palette */
  --navy:        #1d2d40;
  --navy-soft:   #2a4159;
  --blue:        #496b93;
  --blue-deep:   #38567a;
  --crimson:     #b63f4a;
  --crimson-deep:#8f2f39;
  --gold:        #a9854f;
  --green:       #2f7157;
  --green-deep:  #245942;

  --ink:         #21262d;
  --ink-soft:    #4a525c;
  --line:        #ddd5c8;
  --line-soft:   #e9e3d7;

  --paper:       #f8f5ef;   /* warm ivory page bg */
  --paper-card:  #fffdf8;   /* card surface */
  --paper-deep:  #efe9dd;   /* alt section bg */
  --white:       #ffffff;

  /* Type */
  --display: "Playfair Display", Georgia, "Times New Roman", serif;
  --serif:   "Newsreader", Georgia, serif;
  --sans:    "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --maxw: 1180px;
  --radius: 4px;
  --shadow-sm: 0 1px 3px rgba(29,45,64,.07), 0 1px 2px rgba(29,45,64,.05);
  --shadow-md: 0 6px 24px rgba(29,45,64,.10), 0 2px 6px rgba(29,45,64,.06);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--serif);
  font-size:20px;
  line-height:1.66;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{ max-width:100%; display:block; }
a{ color:var(--blue-deep); text-decoration:none; }
a:hover{ color:var(--crimson-deep); }

.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 28px; }

/* ---------- Typography ---------- */
h1,h2,h3,h4{ font-family:var(--display); font-weight:600; line-height:1.14; color:var(--navy); margin:0 0 .5em; letter-spacing:-.005em; }
h1{ font-size:clamp(2.4rem,5vw,3.9rem); }
h2{ font-size:clamp(1.7rem,3.2vw,2.5rem); }
h3{ font-size:1.35rem; }
.eyebrow{
  font-family:var(--sans); font-weight:600; font-size:.74rem;
  letter-spacing:.18em; text-transform:uppercase; color:var(--crimson);
  margin:0 0 .9rem;
}
.lede{ font-size:1.22rem; color:var(--ink-soft); line-height:1.6; }
.serif{ font-family:var(--serif); }

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(248,245,239,.92);
  backdrop-filter:saturate(150%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{ display:flex; align-items:center; height:78px; gap:22px; }
.brand{ display:flex; align-items:center; gap:13px; margin-right:auto; }
.brand .mark{ width:42px; height:42px; flex:0 0 auto; }
.brand .brand-text{ display:flex; flex-direction:column; line-height:1.05; }
.brand .brand-name{ font-family:var(--display); font-weight:600; font-size:1.05rem; color:var(--navy); letter-spacing:.005em; white-space:nowrap; }
.brand .brand-sub{ font-family:var(--sans); font-size:.62rem; letter-spacing:.22em; text-transform:uppercase; color:var(--blue); margin-top:3px; }

.nav-links{ display:flex; align-items:center; gap:22px; list-style:none; margin:0; padding:0; }
.nav-links a{
  font-family:var(--sans); font-size:.86rem; font-weight:500; letter-spacing:.01em;
  color:var(--ink); position:relative; padding:6px 0; white-space:nowrap;
}
.nav-right{ display:flex; align-items:center; gap:10px; }
.nav-search{ display:flex; align-items:center; gap:7px; background:var(--paper-card); border:1px solid var(--line); border-radius:20px; padding:6px 13px; transition:.2s; }
.nav-search:focus-within{ border-color:var(--blue); box-shadow:0 0 0 3px rgba(73,107,147,.12); }
.nav-search svg{ width:15px; height:15px; color:var(--ink-soft); flex:0 0 auto; }
.nav-search input{ border:0; background:none; outline:none; font-family:var(--sans); font-size:.85rem; width:108px; color:var(--ink); }
@media (max-width:1080px){ .nav-search input{ width:74px; } .nav-links{ gap:16px; } }
.nav-links a::after{
  content:""; position:absolute; left:0; bottom:-2px; height:2px; width:0;
  background:var(--crimson); transition:width .25s ease;
}
.nav-links a:hover, .nav-links a.active{ color:var(--navy); }
.nav-links a:hover::after, .nav-links a.active::after{ width:100%; }

.nav-toggle{ display:none; background:none; border:0; cursor:pointer; padding:8px; }
.nav-toggle span{ display:block; width:24px; height:2px; background:var(--navy); margin:5px 0; transition:.25s; }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:9px;
  font-family:var(--sans); font-weight:600; font-size:.86rem; letter-spacing:.02em;
  padding:13px 26px; border-radius:var(--radius); cursor:pointer;
  border:1px solid transparent; transition:.2s; text-decoration:none;
}
.btn-primary{ background:var(--crimson); color:#fff; }
.btn-primary:hover{ background:var(--crimson-deep); color:#fff; }
.btn-ghost{ background:transparent; color:var(--navy); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--navy); color:var(--navy); background:rgba(29,45,64,.03); }
.btn-blue{ background:var(--blue); color:#fff; }
.btn-blue:hover{ background:var(--blue-deep); color:#fff; }

/* ---------- Hero ---------- */
.hero{ position:relative; overflow:hidden; background:var(--navy); color:#f4eee3; }
.hero::before{
  content:""; position:absolute; inset:0;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(73,107,147,.55), transparent 60%),
    radial-gradient(700px 500px at 5% 110%, rgba(182,63,74,.35), transparent 55%);
}
.hero .wrap{ position:relative; display:grid; grid-template-columns:1.05fr .95fr; gap:48px; align-items:stretch; padding:0 28px; min-height:clamp(380px,52vh,520px); }
.hero-copy{ display:flex; flex-direction:column; justify-content:center; padding:48px 0; }
.hero h1{ color:#fff; margin-bottom:.3em; font-size:clamp(2rem,4vw,3.1rem); }
.hero .eyebrow{ color:#e7b4ab; }
.hero p{ color:#d9d1c4; font-size:1.12rem; max-width:46ch; }
.hero-cta{ display:flex; gap:14px; margin-top:26px; flex-wrap:wrap; }
.hero-portrait{ position:relative; align-self:stretch; }
.hero-portrait img{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; object-position:center 22%; }
.hero-portrait::after{ content:""; position:absolute; inset:0; box-shadow:inset 60px 0 60px -40px var(--navy); pointer-events:none; }
.hero-portrait .frame{
  position:absolute; inset:0; overflow:hidden;
  background:linear-gradient(160deg,#33506f,#1d2d40);
  display:flex; align-items:center; justify-content:center; color:rgba(255,255,255,.35);
  font-family:var(--sans); font-size:.8rem; letter-spacing:.1em; text-align:center; padding:20px;
}

/* ---------- Sections ---------- */
section{ padding:78px 0; }
.section-head{ max-width:62ch; margin-bottom:46px; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }
.alt{ background:var(--paper-deep); }
.dark{ background:var(--navy); color:#e9e1d4; }
.dark h2,.dark h3{ color:#fff; }

/* ---------- Cards / grids ---------- */
.grid{ display:grid; gap:26px; }
.cols-3{ grid-template-columns:repeat(3,1fr); }
.cols-4{ grid-template-columns:repeat(4,1fr); }

.card{
  background:var(--paper-card); border:1px solid var(--line-soft); border-radius:var(--radius);
  padding:26px; box-shadow:var(--shadow-sm); transition:.22s;
}
.card:hover{ box-shadow:var(--shadow-md); transform:translateY(-3px); border-color:var(--line); }

/* book covers */
.book{ text-align:left; }
.book .cover{
  aspect-ratio:2/3; border-radius:3px; overflow:hidden; margin-bottom:16px;
  box-shadow:0 12px 28px rgba(29,45,64,.22); background:#dfd7c8;
}
.book .cover img{ width:100%; height:100%; object-fit:cover; }
.book h3{ font-family:var(--serif); font-weight:600; font-size:1.02rem; line-height:1.3; margin-bottom:4px; }
.book .meta{ font-family:var(--sans); font-size:.78rem; color:var(--ink-soft); }

/* quote */
.quote{ font-family:var(--display); font-size:clamp(1.5rem,3vw,2.2rem); line-height:1.3; color:#fff; max-width:22ch; margin:0 auto; text-align:center; font-style:italic; }
.quote-cite{ font-family:var(--sans); font-size:.8rem; letter-spacing:.16em; text-transform:uppercase; color:#bcae9a; text-align:center; margin-top:24px; }

/* ---------- Footer ---------- */
.site-footer{ background:#16222f; color:#b9c2cd; padding:64px 0 34px; font-size:.92rem; }
.site-footer a{ color:#cdd5de; }
.site-footer a:hover{ color:#fff; }
.foot-grid{ display:grid; grid-template-columns:1.6fr 1fr 1fr 1fr; gap:36px; margin-bottom:44px; }
.site-footer h4{ font-family:var(--sans); font-size:.74rem; letter-spacing:.16em; text-transform:uppercase; color:#7e8a98; margin:0 0 16px; }
.site-footer ul{ list-style:none; margin:0; padding:0; }
.site-footer li{ margin-bottom:10px; }
.foot-bottom{ border-top:1px solid rgba(255,255,255,.1); padding-top:24px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; font-size:.82rem; color:#76828f; }
.foot-social{ display:flex; gap:18px; }

/* ---------- Utilities ---------- */
.center{ text-align:center; }
.mt-0{ margin-top:0; } .mb-0{ margin-bottom:0; }
.divider{ width:54px; height:3px; background:var(--crimson); border:0; margin:0 0 26px; }
.center .divider{ margin-left:auto; margin-right:auto; }

/* ---------- Responsive ---------- */
@media (max-width:920px){
  .hero .wrap{ grid-template-columns:1fr; gap:0; padding:0 28px; min-height:0; }
  .hero-copy{ padding:48px 0 36px; order:2; }
  .hero-portrait{ order:1; height:300px; margin:0 -28px; }
  .hero-portrait::after{ box-shadow:none; }
  .cols-4{ grid-template-columns:repeat(2,1fr); }
  .cols-3{ grid-template-columns:repeat(2,1fr); }
  .foot-grid{ grid-template-columns:1fr 1fr; }
}
@media (max-width:680px){
  body{ font-size:18px; }
  .nav-links{
    position:absolute; top:78px; left:0; right:0; background:var(--paper);
    flex-direction:column; align-items:flex-start; gap:0; padding:8px 28px 20px;
    border-bottom:1px solid var(--line); display:none;
  }
  .nav-links.open{ display:flex; }
  .nav-links li{ width:100%; }
  .nav-links a{ display:block; padding:13px 0; width:100%; border-bottom:1px solid var(--line-soft); }
  .nav-toggle{ display:block; }
  .nav-search input{ width:96px; }
  .cols-3,.cols-4{ grid-template-columns:1fr 1fr; }
  .hero-stats{ gap:24px; flex-wrap:wrap; }
}