/*
  THE COMPLETE ENCYCLOPEDIA OF WORLD CIVILIZATIONS
  Distinct "golden atlas / world-map" design.
  Palette: deep teal (ocean), amber/gold (map & sand), terracotta, parchment.
*/

:root{
  --atlas:#e9e2d2;          /* parchment background */
  --paper:#f6f1e5;
  --ink:#2a2619;            /* dark sepia text */
  --ink-soft:#665c43;
  --ocean:#0d4f5a;          /* deep teal */
  --ocean-light:#2f7b86;
  --amber:#b87e12;          /* map gold */
  --amber-deep:#8a5c0a;
  --terra:#a8472b;          /* terracotta accent */
  --border:#d3c7a6;
  --rule:#bfb088;
}

*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}

body{
  font-family:'Palatino Linotype','Book Antiqua',Georgia,'Times New Roman',serif;
  line-height:1.85;
  color:var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(184,126,18,0.10), transparent 40%),
    radial-gradient(circle at 90% 8%, rgba(13,79,90,0.10), transparent 40%),
    var(--atlas);
  font-size:17px;
}

a{color:var(--ocean);}
a:hover{color:var(--terra);text-decoration:underline;}

/* ── Top brow ─────────────────────────────── */
.library-brow{
  background:linear-gradient(90deg,#173d42 0%, var(--ocean) 55%, #0b3a42 100%);
  color:#e9e2d2;
  padding:10px 28px;
  font-size:0.78rem;
  letter-spacing:2.5px;
  text-transform:uppercase;
  font-family:'Trebuchet MS',Verdana,sans-serif;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:6px;
}
.library-brow .gold{color:#ecc97c;font-weight:700;}

/* ── Hero ─────────────────────────────────── */
.hero{
  position:relative;
  text-align:center;
  padding:80px 26px 62px;
  color:#e9e2d2;
  background:
    linear-gradient(rgba(13,79,90,0.90), rgba(23,61,66,0.94)),
    radial-gradient(circle at 50% 30%, rgba(184,126,18,0.25), transparent 60%);
  border-bottom:6px solid var(--amber);
}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:3px;background:var(--terra);}
.hero .eyebrow{display:inline-block;border:1px solid rgba(236,201,124,0.5);border-radius:40px;padding:7px 20px;letter-spacing:3px;font-size:0.8rem;text-transform:uppercase;color:#ecc97c;font-family:'Trebuchet MS',Verdana,sans-serif;margin-bottom:18px;}
.hero h1{font-size:clamp(2.3rem,5vw,3.6rem);font-weight:800;line-height:1.1;margin:0 auto 18px;max-width:940px;text-shadow:0 2px 10px rgba(0,0,0,0.35);}
.hero p{max-width:780px;margin:0 auto 26px;opacity:0.95;font-size:1.12rem;}
.pdf-btn{display:inline-block;background:var(--amber);color:#241a07;border:none;border-radius:8px;padding:12px 26px;font-weight:700;font-family:'Trebuchet MS',Verdana,sans-serif;cursor:pointer;font-size:0.95rem;box-shadow:0 6px 18px rgba(0,0,0,0.3);}
.pdf-btn:hover{background:#d29a3a;}

/* ── Nav ──────────────────────────────────── */
.topnav{background:linear-gradient(90deg,#173d42, var(--ocean));padding:12px 26px;display:flex;align-items:center;gap:20px;flex-wrap:wrap;}
.topnav .brand{color:#ecc97c;font-weight:800;letter-spacing:1px;margin-right:8px;font-size:0.95rem;}
.topnav a{color:#e9e2d2;font-weight:600;font-size:0.92rem;font-family:'Trebuchet MS',Verdana,sans-serif;}
.topnav a:hover{color:#ecc97c;text-decoration:none;}

/* ── Container & content ──────────────────── */
.container{max-width:1020px;margin:0 auto;padding:42px 26px 78px;}
h2{color:var(--ocean);font-size:1.8rem;margin:50px 0 16px;padding-bottom:10px;border-bottom:2px double var(--amber);}
h2 .num{color:var(--amber-deep);font-size:1.5rem;margin-right:8px;font-family:'Trebuchet MS',Verdana,sans-serif;}
h3{color:var(--terra);font-size:1.35rem;margin:28px 0 10px;}
h4{color:var(--ink-soft);font-size:1.1rem;margin:22px 0 8px;}
p{margin:15px 0;}
strong{color:var(--ink);}
ul,ol{margin:16px 0;padding-left:28px;}
li{margin:8px 0;}

blockquote{margin:26px 0;padding:18px 26px;border-left:5px solid var(--amber);background:rgba(184,126,18,0.09);border-radius:0 10px 10px 0;font-style:italic;}
blockquote cite{display:block;margin-top:8px;font-style:normal;font-size:0.9rem;color:var(--ink-soft);}

table{width:100%;border-collapse:collapse;margin:20px 0;background:#fbf7ee;box-shadow:0 2px 10px rgba(0,0,0,0.06);}
th{background:var(--ocean);color:#fff;text-align:left;padding:12px 14px;font-family:'Trebuchet MS',Verdana,sans-serif;font-size:0.9rem;}
td{border:1px solid var(--border);padding:11px 14px;vertical-align:top;}
tr:nth-child(even) td{background:#efe7d2;}

/* ── Cards & grids ────────────────────────── */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;margin:28px 0;}
.card{background:linear-gradient(160deg,#faf5e9,#ece3cc);border:1px solid var(--border);border-left:6px solid var(--amber);border-radius:10px;padding:26px 28px;box-shadow:0 6px 22px rgba(0,0,0,0.08);transition:transform .25s ease, box-shadow .25s ease;}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(0,0,0,0.14);}
.card .level{display:inline-block;background:var(--ocean);color:#fff;font-size:0.72rem;letter-spacing:1.5px;text-transform:uppercase;padding:4px 12px;border-radius:20px;margin-bottom:12px;font-family:'Trebuchet MS',Verdana,sans-serif;}
.card h3{color:var(--ink);font-size:1.35rem;margin-bottom:8px;}
.card p{color:var(--ink-soft);font-size:0.98rem;}
.btn{display:inline-block;background:var(--terra);color:#fff;border-radius:8px;padding:11px 20px;font-weight:700;font-family:'Trebuchet MS',Verdana,sans-serif;font-size:0.95rem;margin-top:12px;}
.btn:hover{background:#8a3620;text-decoration:none;}

/* ── Collapsible sections ─────────────────── */
details.sec{border:1px solid var(--rule);border-left:6px solid var(--amber);border-radius:10px;padding:4px 20px 6px;margin:28px 0;background:rgba(255,255,255,0.30);box-shadow:0 2px 8px rgba(0,0,0,0.04);}
details.sec>summary{cursor:pointer;list-style:none;font-weight:700;outline:none;user-select:none;}
details.sec>summary::-webkit-details-marker{display:none;}
details.sec>summary::after{content:"\25BC";float:right;font-size:0.8em;color:var(--amber-deep);margin-top:20px;}
details.sec:not([open])>summary::after{content:"\25B6";}
details.sec>summary:hover{color:var(--terra);}
details.sec .num{color:var(--amber-deep);}

/* ── At-a-glance quick facts card ─────────── */
.at-glance{background:var(--paper);border:1px solid var(--border);border-left:6px solid var(--ocean);border-radius:12px;padding:22px 26px;margin:24px 0;box-shadow:0 4px 16px rgba(0,0,0,0.08);}
.at-glance h4{color:var(--ocean);margin-top:0;font-size:1.1rem;}
.at-glance dl dt{font-weight:700;color:var(--terra);margin-top:8px;}
.at-glance dl dd{margin:0 0 2px 0;color:var(--ink-soft);}

/* ── Key-term highlighting & tooltip ──────── */
.term{background:rgba(184,126,18,0.16);border-bottom:1px dashed var(--amber-deep);cursor:help;padding:0 2px;border-radius:3px;}
.term:hover{background:rgba(184,126,18,0.32);}
.tipbox{display:none;position:fixed;z-index:9999;max-width:340px;padding:12px 14px;background:var(--ocean);color:#e9e2d2;border-radius:8px;font-size:0.9rem;box-shadow:0 10px 30px rgba(0,0,0,0.4);pointer-events:none;line-height:1.5;}
.tipbox.term-show{display:block;}
.tipbox .tip-term{font-weight:800;color:#ecc97c;}

/* ── Flashcards for timeline dates ────────── */
.fc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin:26px 0;}
.flashcard{perspective:1000px;height:300px;cursor:pointer;}
.flashcard .inner{position:relative;width:100%;height:100%;transition:transform 0.6s;transform-style:preserve-3d;}
.flashcard.flipped .inner{transform:rotateY(180deg);}
.flashcard .face{position:absolute;top:0;left:0;width:100%;height:100%;backface-visibility:hidden;border-radius:12px;padding:20px 22px;box-shadow:0 6px 20px rgba(0,0,0,0.14);overflow:auto;}
.flashcard .front{background:linear-gradient(160deg,var(--ocean),#174248);color:#e9e2d2;display:flex;flex-direction:column;justify-content:center;}
.flashcard .front h4{color:#ecc97c;margin:0 0 6px;font-size:1.3rem;text-align:center;}
.flashcard .front .fc-date{font-size:1.3rem;font-weight:800;text-align:center;color:#fff;margin:4px 0;}
.flashcard .front .fc-hint{text-align:center;font-size:0.85rem;color:#a9d4da;margin-top:12px;}
.flashcard .back{background:var(--paper);color:var(--ink);transform:rotateY(180deg);border:1px solid var(--border);}
.flashcard .back .fc-back-date{font-weight:800;color:var(--terra);border-bottom:1px solid var(--rule);padding-bottom:6px;margin-bottom:8px;}

/* ── Image gallery / lightbox ─────────────── */
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:24px 0;}
.gallery figure{background:var(--paper);border:1px solid var(--border);border-radius:10px;overflow:hidden;box-shadow:0 4px 14px rgba(0,0,0,0.10);}
.gallery img{width:100%;height:170px;object-fit:cover;display:block;}
.gallery figcaption{padding:8px 12px;font-size:0.8rem;color:var(--ink-soft);}
.gallery a img{transition:transform .25s;}
.gallery a:hover img{transform:scale(1.03);}

.lightbox-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.92);z-index:10000;justify-content:center;align-items:center;padding:20px;cursor:zoom-out;}
.lightbox-overlay.open{display:flex;}
.lightbox-overlay img{max-width:100%;max-height:92vh;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,0.6);}

/* ── YouTube embed ────────────────────────── */
.video-wrap{position:relative;padding-bottom:56.25%;height:0;margin:24px 0;border-radius:12px;overflow:hidden;box-shadow:0 6px 20px rgba(0,0,0,0.2);}
.video-wrap iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0;}

/* ── Citations & sources ──────────────────── */
.cite{font-size:0.82rem;color:var(--ink-soft);font-style:italic;}
.sources{margin:30px 0;padding:20px 24px;background:rgba(13,79,90,0.06);border:1px solid var(--border);border-radius:10px;}
.sources h4{color:var(--ocean);}
.sources ol li{margin:9px 0;font-size:0.95rem;word-break:break-word;}
.sources code{background:#ece3cd;padding:2px 6px;border-radius:4px;font-size:0.85rem;}
.callout{padding:16px 22px;margin:24px 0;border-radius:10px;border-left:6px solid var(--ocean);background:rgba(13,79,90,0.08);}
.callout.warn{border-left-color:var(--terra);background:rgba(168,71,43,0.07);}
.callout.warn strong{color:var(--terra);}

/* ── Filters on hub ───────────────────────── */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0;}
.filter-bar button{background:var(--paper);border:1px solid var(--rule);color:var(--ink);padding:8px 16px;border-radius:30px;font-family:'Trebuchet MS',Verdana,sans-serif;font-size:0.85rem;cursor:pointer;transition:all .2s;}
.filter-bar button:hover{border-color:var(--amber);}
.filter-bar button.active{background:var(--ocean);color:#fff;border-color:var(--ocean);}
.filter-bar .group{display:flex;gap:8px;flex-wrap:wrap;align-items:center;padding:0 8px;border-right:1px solid var(--rule);}
.filter-bar .group:last-child{border-right:none;}

footer{text-align:center;color:var(--ink-soft);padding:34px 20px;border-top:5px double var(--amber);background:linear-gradient(#e9e2d2,#e2d8bf);font-size:0.95rem;font-family:'Trebuchet MS',Verdana,sans-serif;}
footer a{color:var(--ocean);}
.quote-fade{opacity:0;transform:translateY(12px);transition:opacity .8s ease,transform .8s ease;}
.quote-fade.visible{opacity:1;transform:none;}

@media (max-width:640px){
  body{font-size:16px;}
  .hero{padding:56px 18px 44px;}
  .container{padding:30px 16px 58px;}
  h2{font-size:1.5rem;}
  .flashcard{height:280px;}
}

/* ── Ads (HILLTOPADS + MONETAG) ───────────── */
.wc-cols{display:flex;gap:16px;max-width:1100px;margin:26px auto;padding:0 16px;align-items:flex-start;flex-wrap:wrap;}
.wc-col-box{flex:1;min-width:260px;background:#fff;border:1px solid #e9ecef;border-radius:10px;padding:8px;display:flex;flex-direction:column;align-items:center;gap:10px;box-shadow:0 2px 12px rgba(0,0,0,.07);}
.wc-col-box iframe{width:100%;border:none;border-radius:6px;display:block;min-height:250px;}
.wc-col-lbl{font-size:9px;color:#94a3b8;text-transform:uppercase;letter-spacing:.5px;align-self:flex-start;}
.wc-col-hide{font-size:9px;background:#0f172a;color:#fff;border:none;border-radius:20px;padding:3px 10px;cursor:pointer;align-self:flex-end;}
@media(max-width:640px){.wc-cols{flex-direction:column;}}