/* ══════════════════════════════════════════════════════════
   NTS Analytics — PE Onboarding Tool
   Shared Stylesheet
   ══════════════════════════════════════════════════════════ */

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Brand Tokens ── */
:root {
  /* NTS brand */
  --navy: #002B5C;
  --navy-light: #003d80;
  --navy-dark: #001a38;
  --orange: #F26522;
  --orange-hover: #d9551a;
  --orange-light: #FFF3EC;

  /* Surfaces */
  --bg: #F5F6F8;
  --bg-card: #FFFFFF;
  --bg-subtle: #E8EDF2;
  --bg-code: #F0F2F5;

  /* Text */
  --text: #2D3748;
  --text-light: #64748B;
  --text-heading: #1A202C;
  --text-inverse: #FFFFFF;

  /* Borders */
  --border: #E2E8F0;
  --border-strong: #CBD5E1;

  /* Status */
  --success: #16A34A;
  --success-bg: #F0FDF4;
  --warning: #D97706;
  --warning-bg: #FFF7ED;
  --error: #DC2626;
  --error-bg: #FEF2F2;
  --info: #2563EB;
  --info-bg: #EFF6FF;

  /* Levels */
  --level-1: #16A34A;
  --level-2: #2563EB;
  --level-3: #7C3AED;
  --level-4: #DB2777;
  --level-5: #DC2626;

  /* Accuracy */
  --verified: #16A34A;
  --probable: #2563EB;
  --needs-review: #F26522;

  /* Layout */
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.1);
  --transition: .2s ease;
  --sidebar-w: 256px;
}

/* ── Base ── */
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--navy); border-radius: 3px; }


/* ══════════════════════════════════════════════════════════
   LAYOUT: Sidebar + Main
   ══════════════════════════════════════════════════════════ */

.sidebar {
  position: fixed; top: 0; left: 0;
  width: var(--sidebar-w); height: 100vh;
  background: var(--navy);
  display: flex; flex-direction: column;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar-logo {
  padding: 24px 20px 18px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.sidebar-logo h1 {
  color: #fff; font-size: 20px; font-weight: 700;
  letter-spacing: -.3px;
}
.sidebar-logo h1 span { color: var(--orange); }
.sidebar-logo p {
  color: rgba(255,255,255,.45); font-size: 10px;
  text-transform: uppercase; letter-spacing: 1.8px;
  margin-top: 4px;
}

/* ── Sidebar Nav ── */
.sidebar-nav { flex: 1; overflow-y: auto; padding: 8px 0; }
.sidebar-nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 20px;
  color: rgba(255,255,255,.6);
  text-decoration: none; font-size: 13px; font-weight: 500;
  transition: all var(--transition);
  border-left: 3px solid transparent;
  position: relative;
}
.sidebar-nav a:hover { color: #fff; background: rgba(255,255,255,.06); }
.sidebar-nav a.active {
  color: #fff; background: rgba(255,255,255,.08);
  border-left-color: var(--orange);
}
.sidebar-nav a .nav-icon {
  width: 18px; text-align: center;
  font-size: 13px; flex-shrink: 0; opacity: .8;
}
.sidebar-nav a .visited-check {
  position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
  font-size: 10px; color: var(--success);
  opacity: 0; transition: opacity var(--transition);
}
.sidebar-nav a.visited .visited-check { opacity: 1; }

/* ── Sidebar Footer ── */
.sidebar-footer {
  padding: 14px 20px;
  border-top: 1px solid rgba(255,255,255,.1);
}
.sidebar-footer label {
  color: rgba(255,255,255,.4); font-size: 10px;
  text-transform: uppercase; letter-spacing: 1.2px;
  display: flex; justify-content: space-between;
}
.progress-bar {
  height: 4px; background: rgba(255,255,255,.12);
  border-radius: 2px; margin-top: 8px; overflow: hidden;
}
.progress-fill {
  height: 100%; background: var(--orange);
  border-radius: 2px; transition: width .4s ease;
  width: 0%;
}

/* Level filter */
.level-filter {
  margin-top: 12px; display: flex; gap: 4px;
}
.level-filter button {
  flex: 1; padding: 4px; border: none;
  border-radius: 4px; font-size: 10px; font-weight: 700;
  cursor: pointer; color: #fff; opacity: .5;
  transition: opacity var(--transition);
  font-family: inherit;
}
.level-filter button:hover, .level-filter button.active { opacity: 1; }
.level-filter button[data-level="1"] { background: var(--level-1); }
.level-filter button[data-level="2"] { background: var(--level-2); }
.level-filter button[data-level="3"] { background: var(--level-3); }
.level-filter button[data-level="4"] { background: var(--level-4); }
.level-filter button[data-level="5"] { background: var(--level-5); }

/* ── Mobile ── */
.hamburger {
  display: none; position: fixed; top: 12px; left: 12px;
  z-index: 200; background: var(--navy); color: #fff;
  border: none; width: 38px; height: 38px; border-radius: var(--radius);
  font-size: 18px; cursor: pointer;
  box-shadow: var(--shadow-lg);
  align-items: center; justify-content: center;
}
.overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.4); z-index: 99;
}

/* ── Main Area ── */
.main {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
}


/* ══════════════════════════════════════════════════════════
   SUB-TABS (horizontal, top of content area)
   ══════════════════════════════════════════════════════════ */

.subtab-bar {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 40px;
  display: flex; gap: 0;
  overflow-x: auto;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.subtab-bar a {
  padding: 14px 18px;
  font-size: 13px; font-weight: 500;
  color: var(--text-light);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}
.subtab-bar a:hover { color: var(--text-heading); }
.subtab-bar a.active {
  color: var(--navy);
  border-bottom-color: var(--orange);
  font-weight: 600;
}


/* ══════════════════════════════════════════════════════════
   PAGE CONTENT
   ══════════════════════════════════════════════════════════ */

.page-container {
  display: none;
  animation: fadeIn .25s ease;
}
.page-container.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.subtab-content { display: none; }
.subtab-content.active { display: block; }

.page-body {
  padding: 36px 48px 72px;
  max-width: 900px;
}

/* ── Page Header ── */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border);
}
.page-header .eyebrow {
  font-size: 11px; text-transform: uppercase;
  letter-spacing: 2px; color: var(--orange);
  font-weight: 600; margin-bottom: 6px;
}
.page-header h2 {
  font-size: 28px; font-weight: 700;
  color: var(--text-heading); letter-spacing: -.4px;
  line-height: 1.2;
}
.page-header p {
  color: var(--text-light); margin-top: 6px;
  font-size: 15px; max-width: 580px;
}


/* ══════════════════════════════════════════════════════════
   CONTENT BLOCKS (leveled)
   ══════════════════════════════════════════════════════════ */

/* Every content section is wrapped in [data-level="N"] */
.content-block {
  margin-bottom: 28px;
  transition: opacity var(--transition);
}
.content-block.hidden-by-level {
  opacity: .15; pointer-events: none;
  filter: grayscale(1);
}
.content-block.hidden-by-level::before {
  content: attr(data-level-label);
  display: block; font-size: 11px;
  color: var(--text-light); font-weight: 600;
  text-transform: uppercase; letter-spacing: 1px;
  margin-bottom: 4px;
}


/* ══════════════════════════════════════════════════════════
   TYPOGRAPHY
   ══════════════════════════════════════════════════════════ */

h3 {
  font-size: 18px; font-weight: 700;
  color: var(--text-heading); margin: 0 0 12px;
  letter-spacing: -.2px;
  display: flex; align-items: center; gap: 10px;
}
h4 {
  font-size: 14px; font-weight: 700;
  color: var(--navy); margin: 16px 0 6px;
}
p { margin-bottom: 10px; }
ul, ol { margin: 6px 0 14px 18px; }
li { margin-bottom: 5px; font-size: 14px; }
strong { color: var(--text-heading); }
code {
  background: var(--bg-code); padding: 2px 6px;
  border-radius: 4px; font-size: 13px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}


/* ══════════════════════════════════════════════════════════
   COMPONENTS
   ══════════════════════════════════════════════════════════ */

/* ── Cards ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 16px; margin: 16px 0;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.card-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--bg-subtle);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; margin-bottom: 12px;
}
.card h4 { margin: 0 0 6px; font-size: 15px; color: var(--text-heading); }
.card p { font-size: 13px; color: var(--text-light); margin: 0; }

/* ── Comparison Card (side-by-side) ── */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px; margin: 16px 0;
}
.comparison-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  position: relative;
}
.comparison-item .model-badge {
  position: absolute; top: 16px; right: 16px;
}

/* ── Info Boxes ── */
.info-box {
  border-left: 4px solid var(--navy);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 14px;
  background: var(--bg-subtle);
}
.info-box.warning  { border-left-color: var(--warning); background: var(--warning-bg); }
.info-box.success  { border-left-color: var(--success); background: var(--success-bg); }
.info-box.error    { border-left-color: var(--error);   background: var(--error-bg); }
.info-box.info     { border-left-color: var(--info);    background: var(--info-bg); }
.info-box strong   { color: var(--text-heading); }

/* ── Placeholder Block ── */
.placeholder-block {
  border: 2px dashed var(--needs-review);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 16px 0;
  background: var(--orange-light);
}
.placeholder-block h4 {
  color: var(--needs-review); margin: 0 0 4px;
  font-size: 13px; text-transform: uppercase;
  letter-spacing: .5px;
}
.placeholder-block p {
  font-size: 13px; color: var(--text-light); margin: 0;
}

/* ── Accordion ── */
.accordion { margin: 14px 0; }
.accordion-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 6px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.accordion-header {
  width: 100%; padding: 14px 18px;
  display: flex; align-items: center; justify-content: space-between;
  background: none; border: none; cursor: pointer;
  font-size: 14px; font-weight: 600;
  color: var(--text-heading);
  text-align: left; font-family: inherit;
  transition: background var(--transition);
}
.accordion-header:hover { background: var(--bg-subtle); }
.accordion-header .arrow {
  transition: transform var(--transition);
  color: var(--text-light); font-size: 11px;
}
.accordion-item.open .accordion-header .arrow { transform: rotate(180deg); }
.accordion-body {
  max-height: 0; overflow: hidden;
  transition: max-height .35s ease;
}
.accordion-body-inner {
  padding: 0 18px 18px;
  font-size: 14px; color: var(--text);
}

/* ── Tables ── */
.table-wrap {
  overflow-x: auto; margin: 14px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
table {
  width: 100%; border-collapse: collapse;
  font-size: 13px; background: var(--bg-card);
}
th {
  background: var(--navy); color: #fff;
  padding: 10px 14px; text-align: left;
  font-weight: 600; font-size: 11px;
  text-transform: uppercase; letter-spacing: .5px;
  white-space: nowrap;
}
td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-subtle); }

/* ── Tags / Badges ── */
.tag {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 9px; border-radius: 20px;
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .3px;
}
.tag-navy   { background: var(--bg-subtle);   color: var(--navy); }
.tag-orange { background: var(--orange-light); color: var(--orange); }
.tag-green  { background: var(--success-bg);   color: var(--success); }
.tag-blue   { background: var(--info-bg);      color: var(--info); }
.tag-purple { background: #F3F0FF;             color: #7C3AED; }
.tag-pink   { background: #FDF2F8;             color: #DB2777; }
.tag-red    { background: var(--error-bg);     color: var(--error); }

/* Level badge */
.level-badge {
  display: inline-flex; align-items: center;
  padding: 2px 8px; border-radius: 4px;
  font-size: 10px; font-weight: 700;
  color: #fff; letter-spacing: .3px;
}
.level-badge[data-level="1"] { background: var(--level-1); }
.level-badge[data-level="2"] { background: var(--level-2); }
.level-badge[data-level="3"] { background: var(--level-3); }
.level-badge[data-level="4"] { background: var(--level-4); }
.level-badge[data-level="5"] { background: var(--level-5); }

/* Accuracy badge */
.accuracy {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 11px; font-weight: 600;
  padding: 2px 8px; border-radius: 4px;
}
.accuracy-verified    { background: var(--success-bg); color: var(--verified); }
.accuracy-probable    { background: var(--info-bg);    color: var(--probable); }
.accuracy-needs-review { background: var(--orange-light); color: var(--needs-review); }

/* ── Search Input ── */
.search-box {
  position: relative; margin: 14px 0;
}
.search-box input {
  width: 100%; padding: 11px 14px 11px 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px; font-family: inherit;
  background: var(--bg-card);
  box-shadow: var(--shadow);
  transition: border-color var(--transition);
}
.search-box input:focus {
  outline: none; border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(0,43,92,.08);
}
.search-box .search-icon {
  position: absolute; left: 13px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-light); font-size: 14px;
  pointer-events: none;
}

/* ── Quiz ── */
.quiz {
  background: var(--bg-card);
  border: 2px solid var(--navy);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 28px 0;
  box-shadow: var(--shadow-md);
}
.quiz-title {
  font-size: 16px; font-weight: 700;
  color: var(--navy); margin-bottom: 18px;
  display: flex; align-items: center; gap: 8px;
}
.quiz-question {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.quiz-question:last-of-type { border-bottom: none; padding-bottom: 0; }
.quiz-question > p {
  font-weight: 600; color: var(--text-heading);
  margin-bottom: 10px; font-size: 14px;
}
.quiz-option {
  display: block; padding: 9px 13px;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 5px; cursor: pointer;
  font-size: 13px; transition: all var(--transition);
  background: var(--bg-card); color: var(--text);
}
.quiz-option:hover { border-color: var(--navy); background: var(--bg-subtle); }
.quiz-option.selected { border-color: var(--navy); background: var(--bg-subtle); font-weight: 600; }
.quiz-option.correct  { border-color: var(--success); background: var(--success-bg); color: var(--success); }
.quiz-option.wrong    { border-color: var(--error); background: var(--error-bg); color: var(--error); }
.quiz-option.disabled { pointer-events: none; opacity: .65; }
.quiz-feedback {
  margin-top: 6px; font-size: 12px; font-weight: 500;
  display: none;
}
.quiz-result {
  display: none; padding: 14px 18px;
  border-radius: var(--radius); margin-top: 14px;
  font-weight: 600; font-size: 14px;
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 20px;
  background: var(--orange); color: #fff;
  border: none; border-radius: 6px;
  font-size: 13px; font-weight: 600;
  cursor: pointer; font-family: inherit;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}
.btn:hover { background: var(--orange-hover); transform: translateY(-1px); }
.btn-navy { background: var(--navy); }
.btn-navy:hover { background: var(--navy-light); }
.btn-outline {
  background: transparent; color: var(--navy);
  border: 2px solid var(--navy);
  box-shadow: none;
}
.btn-outline:hover { background: var(--navy); color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 12px; }

/* ── Process Steps ── */
.steps { margin: 16px 0; }
.step {
  display: flex; gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: none; }
.step-num {
  flex-shrink: 0; width: 36px; height: 36px;
  background: var(--navy); color: #fff;
  border-radius: 50%; display: flex;
  align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px;
}
.step-body h4 { margin: 0 0 3px; font-size: 14px; }
.step-body p { margin: 0; font-size: 13px; color: var(--text-light); }

/* ── Page Navigation ── */
.page-nav {
  display: flex; justify-content: space-between;
  margin-top: 40px; padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* ── Hero (Welcome page) ── */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  border-radius: var(--radius-lg);
  padding: 44px;
  color: #fff; margin-bottom: 32px;
  position: relative; overflow: hidden;
}
.hero::after {
  content: ''; position: absolute;
  right: -30px; top: -30px;
  width: 180px; height: 180px;
  background: var(--orange); border-radius: 50%;
  opacity: .1;
}
.hero h2 { font-size: 32px; margin-bottom: 10px; letter-spacing: -.4px; }
.hero p { opacity: .8; font-size: 15px; max-width: 540px; line-height: 1.7; }

/* ── Diagram Container ── */
.diagram-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px; margin: 16px 0;
  text-align: center;
  box-shadow: var(--shadow);
}
.diagram-wrap svg { max-width: 100%; height: auto; }

/* ── Tooltip (abbreviation) ── */
.abbr-tip {
  position: relative; cursor: help;
  border-bottom: 1px dotted var(--navy);
  font-weight: 600;
}
.abbr-tip:hover::after {
  content: attr(data-tip);
  position: absolute; bottom: 100%; left: 50%;
  transform: translateX(-50%);
  background: var(--navy); color: #fff;
  padding: 5px 10px; border-radius: 5px;
  font-size: 12px; font-weight: 400;
  white-space: nowrap; z-index: 500;
  box-shadow: var(--shadow-lg);
  pointer-events: none;
}

/* ── Checklist ── */
.checklist { margin: 14px 0; }
.checklist-item {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 5px;
  font-size: 13px;
  box-shadow: var(--shadow);
}
.checklist-item input[type="checkbox"] {
  margin-top: 2px; accent-color: var(--navy);
  width: 16px; height: 16px; flex-shrink: 0;
}
.checklist-item.checked { opacity: .5; text-decoration: line-through; }

/* ── Source citation under a verified section ── */
.source {
  font-size: 11.5px;
  color: var(--text-light);
  font-style: italic;
  border-left: 2px solid var(--border-strong);
  padding-left: 10px;
  margin: 10px 0 0;
}

/* ── Login gate ── */
.login-gate {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  background: var(--navy);
}
.login-gate.hidden { display: none; }
.login-card {
  background: #fff; border-radius: 12px; padding: 40px 36px;
  width: min(360px, calc(100vw - 40px));
  display: flex; flex-direction: column; gap: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
  text-align: center;
}
.login-card h1 { font-size: 32px; color: var(--navy); letter-spacing: -1px; }
.login-card h1 span { color: var(--orange); }
.login-card p { color: var(--text-light); font-size: 13px; margin-bottom: 8px; }
.login-card input {
  font: inherit; font-size: 14px; padding: 11px 14px;
  border: 1px solid var(--border-strong); border-radius: 8px;
  outline: none;
}
.login-card input:focus { border-color: var(--navy); }
.login-card .btn { margin-top: 4px; justify-content: center; }
.login-error { color: #DC2626; font-size: 12.5px; min-height: 16px; }

/* ── Inline source citation inside a table cell ── */
.source-inline {
  font-size: 11px;
  color: var(--text-light);
  font-style: italic;
  white-space: nowrap;
}

/* ── Level filter: "All" button ── */
.level-filter button[data-level="all"] {
  background: var(--navy);
  flex: 0 0 auto;
  padding-inline: 10px;
}

/* ── Hidden by the exclusive level filter (blocks, sub-tabs, sidebar items) ── */
.filtered-out { display: none !important; }


/* ══════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════ */

@media (max-width: 860px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .hamburger { display: flex; }
  .overlay.show { display: block; }
  .main { margin-left: 0; }
  .page-body { padding: 24px 18px 56px; }
  .subtab-bar { padding: 0 18px; }
  .hero { padding: 28px 20px; }
  .hero h2 { font-size: 24px; }
  .card-grid { grid-template-columns: 1fr; }
  .comparison { grid-template-columns: 1fr; }
  .page-header h2 { font-size: 22px; }
}