/* =========================================================
   H-AVI Survey Website – Custom Styles (Nordic Academic)
   ========================================================= */

/* ── Variables ─────────────────────────────────────────── */
:root {
  /* Core palette — vivid emerald + coral */
  --primary:       #059669;
  --primary-dk:    #047857;
  --primary-lt:    #34D399;
  --accent:        #F25C38;
  --accent-lt:     #FBBBA8;

  /* Surfaces — clean cool-white */
  --bg:            #F4F6F8;
  --bg-section:    #EFF1F5;
  --card-bg:       #FFFFFF;
  --hero-bg:       #0F1B2D;

  /* Typography */
  --text:          #111827;
  --text-muted:    #6B7280;
  --text-light:    #9CA3AF;

  /* Structural */
  --border:        #E5E7EB;
  --border-strong: #D1D5DB;
  --radius-sm:     4px;
  --radius-md:     8px;
  --radius-lg:     12px;

  /* Fonts */
  --font-display:  "DM Serif Display", Georgia, serif;
  --font-body:     "DM Sans", "Segoe UI", system-ui, sans-serif;

  /* Section badge colors */
  --sec-behavior:  #89C2D9;
  --sec-data:      #007bba;
  --sec-comm:      #013A63;

  /* Method badge colors — organized by family */
  --m-woz:         #F76F8E;   /* real-world/special — pink */
  --m-field:       #EE6C4D;   /* real-world — coral-red */
  --m-ar:          #F38D68;   /* real-world AR — salmon */
  --m-video:       #FABC2A;   /* survey/video — yellow */
  --m-photo:       #FFCAB1;   /* survey/photo — peach */
  --m-web:         #F2BAC9;   /* digital survey — blush */
  --m-vrhmd:       #7FD8BE;   /* VR family — mint */
  --m-vrcave:      #519872;   /* VR family — sage green */
  --m-vrscreen:    #A1FCDF;   /* VR family — light mint */
  --m-360:         #3B5249;   /* video-based — dark teal */
}

/* ── Base ───────────────────────────────────────────────── */
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary-lt);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { color: var(--primary); }

::selection {
  background: var(--accent-lt);
  color: var(--text);
}

/* ── Hero ───────────────────────────────────────────────── */
#hero {
  background: var(--hero-bg);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.72' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  color: #F0F4FF;
  padding: 4rem 0 3.5rem;
}

#hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.5rem);
  font-weight: 400;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: #F0F4FF;
  margin-bottom: 1.5rem;
}

#hero .subtitle {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary-lt);
  opacity: 1;
  margin-bottom: 1rem;
}

#hero .authors {
  font-weight: 300;
  font-size: 0.9rem;
  color: rgba(240, 244, 255, 0.65);
  letter-spacing: 0.01em;
}

.institution-line {
  font-size: 0.75rem;
  color: rgba(240, 244, 255, 0.38);
  font-weight: 300;
  letter-spacing: 0.01em;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: 1px solid rgba(52, 211, 153, 0.4);
  color: #F0F4FF;
  background: transparent;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
  margin-bottom: 0.4rem;
}
.hero-btn:hover {
  background: rgba(52, 211, 153, 0.12);
  border-color: var(--primary-lt);
  color: var(--primary-lt);
}

/* ── Section headers ───────────────────────────────────── */
.section-title {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-bottom: 2rem;
  display: flex;
  align-items: baseline;
  gap: 1rem;
  border-left: none;
  padding-left: 0;
}

.section-title::before {
  content: attr(data-num);
  font-family: var(--font-display);
  font-size: 3.2rem;
  font-weight: 400;
  color: var(--border-strong);
  line-height: 1;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

/* ── Overview ───────────────────────────────────────────── */
#overview {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 4rem 0;
}

#overview .abstract-text {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text);
  text-align: left;
}

#overview .abstract-text b {
  font-weight: 600;
  color: var(--primary);
}

#overview .figure-caption {
  font-size: 0.75rem;
  color: var(--text-light);
  text-align: center;
  margin-top: 0.75rem;
  font-style: italic;
  letter-spacing: 0.02em;
}

.overview-img {
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(28, 28, 26, 0.07);
}

/* ── Stats ──────────────────────────────────────────────── */
#stats {
  background: var(--bg);
  padding: 4rem 0;
}

.stat-card {
  background: var(--card-bg);
  border: none;
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem 1.5rem;
  text-align: center;
  box-shadow: 0 2px 16px rgba(28, 28, 26, 0.07), 0 1px 4px rgba(28, 28, 26, 0.04);
  transition: box-shadow 0.2s ease, transform 0.15s ease;
}
.stat-card:hover {
  box-shadow: 0 6px 24px rgba(28, 28, 26, 0.11), 0 2px 8px rgba(28, 28, 26, 0.05);
  transform: translateY(-2px);
}

.stat-card .stat-number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat-card .stat-label {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.5rem;
}

/* Chart titles */
.chart-title {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* Bar charts */
.method-bar-label {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 400;
  min-width: 130px;
  max-width: 130px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
  line-height: 1.3;
  text-align: left;
}

.method-bar-track {
  height: 8px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}

.method-bar-fill {
  height: 100%;
  border-radius: 99px;
  transition: width 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.method-bar-count {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  min-width: 24px;
  text-align: right;
}

/* ── Table section ──────────────────────────────────────── */
#table-section {
  background: var(--bg);
}

/* Filter bar */
#filter-bar {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 1.25rem 0 1rem;
  margin-bottom: 0.5rem;
  box-shadow: none;
}

#filter-bar label {
  font-family: var(--font-body);
  font-size: 0.67rem;
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
  display: block;
}

#filter-bar .form-select,
#filter-bar .form-control {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 400;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--card-bg);
  color: var(--text);
  padding: 0.4rem 0.65rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

#filter-bar .form-select:focus,
#filter-bar .form-control:focus {
  border-color: var(--primary-lt);
  box-shadow: 0 0 0 3px rgba(82, 183, 136, 0.15);
  outline: none;
}

#btn-reset {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  border-color: var(--border-strong);
  color: var(--text-muted);
  padding: 0.4rem 0.85rem;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
#btn-reset:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

#result-count {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 300;
  color: var(--text-light);
  letter-spacing: 0.03em;
  align-self: center;
}

/* Table wrapper */
.table-wrapper {
  background: var(--card-bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(28, 28, 26, 0.06);
}

#studies-table {
  margin-bottom: 0;
  font-size: 0.82rem;
  font-family: var(--font-body);
}

#studies-table thead th {
  background: #1E2D40;
  color: rgba(240, 244, 255, 0.85);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: none;
  position: sticky;
  top: 0;
  z-index: 2;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  padding: 0.75rem 0.9rem;
}

#studies-table thead th .sort-icon {
  opacity: 0.35;
  font-size: 0.65rem;
  margin-left: 5px;
}

#studies-table thead th:hover {
  background: #0F1B2D;
  color: #F0F4FF;
}

#studies-table tbody tr:hover {
  background: rgba(5, 150, 105, 0.05);
}

#studies-table tbody tr:nth-child(even) {
  background: rgba(17, 24, 39, 0.018);
}
#studies-table tbody tr:nth-child(even):hover {
  background: rgba(5, 150, 105, 0.05);
}

#studies-table tbody td {
  vertical-align: top;
  padding: 0.65rem 0.9rem;
  border-color: var(--border);
  font-size: 0.82rem;
  line-height: 1.45;
}

/* Paper cell */
.paper-cell .paper-label {
  font-weight: 600;
  font-size: 0.84rem;
  color: var(--primary);
}
.paper-cell .paper-label a {
  color: var(--primary);
  text-decoration: none;
}
.paper-cell .paper-label a:hover {
  color: var(--primary-lt);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.paper-cell .paper-title {
  font-size: 0.77rem;
  color: var(--text);
  margin-top: 3px;
  line-height: 1.4;
}
.paper-cell .paper-venue {
  font-size: 0.72rem;
  color: var(--text-light);
  margin-top: 2px;
  font-style: italic;
}

/* Section badges */
.sec-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: #fff;
  margin-bottom: 4px;
}
.sec-behavior { background: var(--sec-behavior); color: #0D2030; }
.sec-data     { background: var(--sec-data); }
.sec-comm     { background: var(--sec-comm); }

/* Method badges */
.method-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.69rem;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: #fff;
  margin: 1px 1px;
  white-space: nowrap;
}
.m-woz      { background: var(--m-woz); }
.m-vrhmd    { background: var(--m-vrhmd); color: #1C2B26; }
.m-vrcave   { background: var(--m-vrcave); }
.m-vrscreen { background: var(--m-vrscreen); color: #1C2B26; }
.m-field    { background: var(--m-field); }
.m-video    { background: var(--m-video); color: #3A2800; }
.m-photo    { background: var(--m-photo); color: #3A2800; }
.m-360      { background: var(--m-360); }
.m-ar       { background: var(--m-ar); }
.m-web      { background: var(--m-web); color: #3A1020; }

/* Truncated cells */
.cell-truncate {
  max-height: 5em;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  cursor: help;
}

/* Pagination */
.pagination-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
}
.pagination-bar .page-info {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 300;
}
.pagination-bar .btn-group .btn {
  font-size: 0.75rem;
  padding: 0.25rem 0.55rem;
  border-color: var(--border-strong);
  color: var(--text-muted);
  border-radius: var(--radius-sm) !important;
  transition: background 0.15s, color 0.15s;
}
.pagination-bar .btn-group .btn:hover:not(:disabled) {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.pagination-bar .btn-group .btn:disabled {
  opacity: 0.3;
}
.per-page-select {
  font-family: var(--font-body);
  font-size: 0.78rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  background: var(--card-bg);
  padding: 0.2rem 0.45rem;
}

/* ── Citation ────────────────────────────────────────────── */
#citation {
  background: var(--bg-section);
  border-top: 1px solid var(--border);
  padding: 4rem 0;
}
#bibtex-block {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--text);
  white-space: pre-wrap;
  overflow-x: auto;
}
#copy-btn {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  border-color: var(--primary);
  color: var(--primary);
  margin-top: 0.75rem;
  padding: 0.4rem 1rem;
  transition: background 0.15s, color 0.15s;
}
#copy-btn:hover {
  background: var(--primary);
  color: #fff;
}

/* ── Footer ─────────────────────────────────────────────── */
footer {
  background: var(--hero-bg);
  color: rgba(238, 240, 232, 0.48);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  padding: 1.5rem 0;
  text-align: center;
}
footer a {
  color: var(--primary-lt);
  text-decoration: none;
}
footer a:hover {
  color: #EEF0E8;
  text-decoration: underline;
}

/* ── Road user badges ────────────────────────────────────── */
.ru-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.69rem;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: #fff;
  margin: 1px 0;
  white-space: nowrap;
}
.ru-ped-av        { background: #797D62; }
.ru-ped-shuttle   { background: #9B9B7A; color: #1A1A0E; }
.ru-ped-delivery  { background: #D9AE94; color: #2A1A0E; }
.ru-multi         { background: #F1DCA7; color: #2A1A0E; }
.ru-cyc-av        { background: #FFCB69; color: #2A1A0E; }
.ru-cyc-shuttle   { background: #D08C60; }
.ru-mixed-users   { background: #997B66; }
.ru-mixed-traffic { background: #CABBB1; color: #2A1A0E; }

/* ── Scenario type badges ────────────────────────────────── */
.scen-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 5px;
  border-radius: var(--radius-sm);
  color: #fff;
  margin-bottom: 3px;
  margin-right: 2px;
}
.scen-shared       { background: #f4c9d7; color: #3A1020; }
.scen-intersection { background: #a68e8e; color: #2A1F14; }
.scen-signalized   { background: #d7ebcd; }
.scen-unsignalized { background: #a0c3a6; color: #1A2E18; }
.scen-unclear      { background: #dccabc; color: #1A2E18; }
/* ── Model family badges ─────────────────────────────────── */
.model-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 5px;
  border-radius: var(--radius-sm);
  color: #fff;
  margin-bottom: 3px;
}
.model-statistics      { background: #FFF1E6; color: #2A1A0E; }
.model-linear          { background: #FDE2E4; color: #2A1020; }
.model-discrete-choice { background: #FAD2E1; color: #2A1020; }
.model-hybrid          { background: #C5DEDD; color: #0D2020; }
.model-deep-learning   { background: #DBE7E4; color: #0D2020; }
.model-causal          { background: #BCD4E6; color: #0D1A2A; }
.model-psychological   { background: #99C1DE; color: #0D1A2A; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  #hero h1 { font-size: 1.4rem; }
  .section-title::before { font-size: 2.4rem; }
  .cell-truncate { -webkit-line-clamp: 2; line-clamp: 2; }
  .d-md-none-col { display: none; }
}

/* ── Loading state ───────────────────────────────────────── */
#loading-row td {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

/* ── Badge hover transitions ─────────────────────────────── */
.method-badge,
.ru-badge,
.scen-badge,
.model-badge {
  transition: opacity 0.12s;
}
.method-badge:hover,
.ru-badge:hover,
.scen-badge:hover,
.model-badge:hover {
  opacity: 0.8;
}