/* ==========================================================
   CESC – Civil Engineering and Sustainable Cities
   SITE STYLE SHEET — Minimalist Academic Theme
   Purpose: Clean, readable, print-friendly, OJS-ready
   File: cesc-site-minimalist-academic.css
   ========================================================== */

/* =========================
   0. VARIABLES & RESET
   ========================== */
:root{
  --bg: #ffffff;
  --surface: #ffffff;
  --ink: #111827;         /* charcoal */
  --muted: #6b7280;       /* gray */
  --accent: #0b4fa6;      /* deep academic blue */
  --accent-2: #2f6f44;    /* subtle green for accents */
  --line: rgba(17,24,39,0.06);
  --radius: 8px;
  --container-width: 1100px;

  --font-serif: "Merriweather", "Georgia", "Times New Roman", serif;
  --font-sans: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Monaco, Consolas, monospace;

  --lead-size: 1.05rem;
  --base-size: 1rem;
}

/* Base reset */
* { box-sizing: border-box; }
html { -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale; font-size:16px; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-feature-settings: "liga" 1;
}

/* Typographic rhythm */
h1,h2,h3,h4,h5 { font-family: var(--font-serif); margin: 0 0 0.6rem; color: var(--ink); line-height:1.18; }
p { margin: 0 0 1rem; font-size: var(--base-size); color: var(--ink); }
small, .muted { color: var(--muted); font-size: 0.92rem; }

/* Links */
a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-2); text-decoration-color: var(--accent-2); }

/* Images */
img { max-width: 100%; height: auto; display:block; }

/* Utilities */
.container { width: 100%; max-width: var(--container-width); margin: 0 auto; padding: 0 1rem; }
.row { display:flex; gap:1rem; flex-wrap:wrap; }
.col { flex: 1; min-width:0; }

/* Minimal helper spacing */
.mt-1{margin-top:0.5rem}
.mt-2{margin-top:1rem}
.mb-1{margin-bottom:0.5rem}
.mb-2{margin-bottom:1rem}

/* =========================
   1. SITE HEADER (minimal)
   ========================= */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 60;
}
.site-header .container {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:0.6rem 0;
}
.brand {
  display:flex;
  align-items:center;
  gap:0.8rem;
}
.brand .logo {
  width:52px;
  height:52px;
  border-radius:6px;
  background:transparent;
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:var(--font-serif);
  font-weight:700;
  color:var(--accent);
  border:1px solid var(--line);
}
.brand .title {
  font-family:var(--font-serif);
  font-size:1rem;
  font-weight:700;
  margin:0;
  color:var(--ink);
}
.brand .subtitle {
  font-size:0.82rem;
  color:var(--muted);
  margin-top:2px;
}

/* Navigation: simple horizontal links */
.nav {
  display:flex;
  gap:0.6rem;
  align-items:center;
  font-weight:600;
  font-size:0.95rem;
}
.nav a {
  padding:8px 10px;
  border-radius:6px;
  color:var(--ink);
}
.nav a:hover {
  background: rgba(11,79,166,0.06);
  color:var(--accent);
}

/* Action buttons (login/register) */
.actions {
  display:flex;
  gap:0.5rem;
  align-items:center;
}
.btn {
  padding:8px 12px;
  border-radius:8px;
  font-weight:700;
  font-size:0.92rem;
  border:1px solid var(--line);
  background:transparent;
  cursor:pointer;
}
.btn-primary {
  background:var(--accent);
  color:#fff;
  border:1px solid rgba(11,79,166,0.9);
}

/* Search: understated */
.search { display:flex; gap:6px; align-items:center; }
.search input {
  padding:8px 10px;
  border:1px solid var(--line);
  border-radius:8px;
  min-width:200px;
  background:transparent;
  font-size:0.95rem;
}

/* Mobile: collapse nav into toggle */
.nav-toggle { display:none; border:1px solid var(--line); background:transparent; padding:8px; border-radius:8px; }
@media (max-width:820px){
  .nav { display:none; }
  .nav-toggle { display:inline-flex; }
}

/* =========================
   2. HERO / HOMEPAGE BANNER
   ========================= */
.hero {
  padding:44px 0;
  background: linear-gradient(180deg, rgba(11,79,166,0.04), transparent 40%);
}
.hero .hero-inner {
  display:grid;
  grid-template-columns: 1fr 360px;
  gap:28px;
  align-items:center;
}
.hero .kicker {
  color:var(--accent);
  font-weight:700;
  font-size:0.82rem;
  letter-spacing:0.08em;
  text-transform:uppercase;
  margin-bottom:8px;
}
.hero .title {
  font-family:var(--font-serif);
  font-size:2rem;
  margin-bottom:0.6rem;
  color:var(--ink);
}
.hero .lead {
  font-size:var(--lead-size);
  color:var(--muted);
  margin-bottom:1rem;
}

/* CTA */
.hero .cta-group { display:flex; gap:12px; flex-wrap:wrap; }
.cta {
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:8px;
  font-weight:700;
  text-decoration:none;
}
.cta-primary {
  background:var(--accent);
  color:#fff;
  border-color: rgba(11,79,166,0.9);
}
.cta-ghost { background:transparent; color:var(--ink); }

/* Right panel: simple card */
.hero .panel {
  background: #fff;
  border:1px solid var(--line);
  border-radius:10px;
  padding:16px;
  box-shadow: 0 6px 18px rgba(17,24,39,0.04);
}
.panel .logo {
  width:56px; height:56px; border-radius:6px; display:flex; align-items:center; justify-content:center; font-weight:800; color:var(--accent);
  border:1px solid var(--line);
}

/* =========================
   3. PROCEEDINGS GRID (cards) - minimalist
   ========================= */
.grid {
  display:grid;
  gap:1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  background:#fff;
  border:1px solid var(--line);
  border-radius:10px;
  padding:14px;
  transition: box-shadow .18s ease, transform .18s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(17,24,39,0.06);
}
.card .title { font-size:1rem; font-weight:700; margin-bottom:6px; color:var(--ink); }
.card .meta { font-size:0.88rem; color:var(--muted); }

/* =========================
   4. ARTICLE / PAPER LAYOUT
   ========================= */
.article {
  background:#fff;
  border:1px solid var(--line);
  border-radius:10px;
  padding:20px;
}
.article h2 { font-family:var(--font-serif); font-size:1.5rem; margin-bottom:0.6rem; }
.article .authors { color:var(--muted); margin-bottom:10px; }
.abstract {
  border-left:4px solid var(--accent);
  padding:12px 14px;
  background: rgba(11,79,166,0.03);
  margin: 12px 0;
  border-radius:6px;
}
.article p { color:var(--ink); }

/* Figures */
.figure { margin:14px 0; text-align:center; }
.figure img { border-radius:8px; }

/* Tables */
.table { width:100%; border-collapse:collapse; margin:1rem 0; }
.table th, .table td { padding:10px; border:1px solid var(--line); text-align:left; font-size:0.95rem; }
.table th { background: rgba(17,24,39,0.03); font-weight:700; }

/* =========================
   5. SIDEBAR & WIDGETS
   ========================= */
.sidebar { padding:12px; border:1px solid var(--line); border-radius:10px; background:#fff; }
.widget { margin-bottom:12px; }
.widget h4 { margin:0 0 8px; font-size:1rem; font-weight:700; color:var(--ink); }
.widget a { display:block; padding:8px 0; color:var(--accent); text-decoration:none; }

/* =========================
   6. FORMS (register/submit)
   ========================= */
.form { background:#fff; border:1px solid var(--line); padding:14px; border-radius:10px; }
.form label { font-weight:700; font-size:0.95rem; margin-bottom:6px; display:block; }
input[type="text"], input[type="email"], textarea, select {
  padding:10px 12px;
  border-radius:8px;
  border:1px solid var(--line);
  width:100%;
  font-size:0.95rem;
  background:transparent;
}

/* =========================
   7. FOOTER (minimal academic)
   ========================= */
.site-footer {
  border-top:1px solid var(--line);
  background:transparent;
  padding:28px 0;
  color:var(--muted);
}
.site-footer .container { display:flex; gap:1rem; align-items:flex-start; justify-content:space-between; flex-wrap:wrap; }
.footer-col { min-width:220px; flex:1; }
.footer-brand .title { font-family:var(--font-serif); font-weight:700; color:var(--ink); }
.footer-links a { display:block; color:var(--muted); padding:6px 0; text-decoration:none; }
.footer-legal { font-size:0.9rem; color:var(--muted); margin-top:8px; }

/* =========================
   8. ACCESSIBILITY & PRINT
   ========================= */
a:focus, button:focus, input:focus, select:focus, textarea:focus {
  outline: none;
  box-shadow: 0 0 0 4px rgba(11,79,166,0.12);
  border-radius:6px;
}

/* Print */
@media print {
  body { background:#fff; color:#000; }
  .site-header, .site-footer, .nav, .btn, .search { display:none !important; }
  .container { max-width:100%; padding:0; }
  .article { border: none; box-shadow:none; background:transparent; }
}

/* =========================
   9. RESPONSIVE
   ========================= */
@media (max-width:1024px) {
  .hero .hero-inner { grid-template-columns:1fr; }
  .site-footer .container { flex-direction:column; }
}
@media (max-width:680px) {
  .search input { min-width:120px; }
  .brand .title{font-size:0.95rem}
  .hero { padding:28px 0; }
  .container { padding:0 12px; }
}