/* ============================================================
   VoltCharge Documentation — Global Styles
   ============================================================ */

:root {
  --bg-base: #0a0a0f;
  --bg-card: #111118;
  --bg-card-hover: #16161f;
  --bg-sidebar: #0d0d14;
  --bg-nav: rgba(10, 10, 15, 0.95);
  --border: #1e1e2a;
  --border-glow: #10b98140;
  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent-green: #10b981;
  --accent-green-dim: #10b98130;
  --accent-blue: #3b82f6;
  --accent-blue-dim: #3b82f630;
  --accent-purple: #8b5cf6;
  --accent-purple-dim: #8b5cf630;
  --accent-amber: #f59e0b;
  --accent-amber-dim: #f59e0b30;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--accent-green); text-decoration: none; transition: color 0.2s; }
a:hover { color: #34d399; }

/* ============================================================
   TOP NAVIGATION
   ============================================================ */

.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
}

.top-nav .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text-primary);
}

.top-nav .logo svg { flex-shrink: 0; }

.top-nav .logo span.volt { color: var(--accent-green); }

.nav-links {
  display: flex;
  gap: 4px;
}

.nav-links a {
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-card);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
}

/* ============================================================
   PAGE LAYOUT (sidebar + main)
   ============================================================ */

.page-body {
  margin-top: 64px;
  display: flex;
  min-height: calc(100vh - 64px);
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 64px;
  left: 0;
  width: 260px;
  height: calc(100vh - 64px);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 20px 0;
  z-index: 50;
}

.sidebar-title {
  padding: 0 20px 16px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
}

.sidebar a {
  display: block;
  padding: 8px 20px;
  color: var(--text-secondary);
  font-size: 14px;
  border-left: 3px solid transparent;
  transition: all 0.2s;
}

.sidebar a:hover {
  color: var(--text-primary);
  background: var(--bg-card);
  border-left-color: var(--accent-green);
}

.sidebar a.active {
  color: var(--accent-green);
  background: var(--accent-green-dim);
  border-left-color: var(--accent-green);
  font-weight: 500;
}

/* Main content area */
.main-content {
  margin-left: 260px;
  flex: 1;
  padding: 40px 48px 80px;
  max-width: 900px;
  overflow-x: hidden;
  min-width: 0;
}

/* Landing page — no sidebar */
.landing-body {
  margin-top: 64px;
}

/* ============================================================
   HERO SECTION
   ============================================================ */

.hero {
  text-align: center;
  padding: 100px 24px 60px;
  background: linear-gradient(180deg, #10b98110 0%, transparent 60%);
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.6;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-green-dim);
  border: 1px solid var(--accent-green);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-green);
  margin-bottom: 24px;
}

/* ============================================================
   MODULE CARDS (Landing page)
   ============================================================ */

.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}

.module-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(16, 185, 129, 0.08);
}

.module-card .card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.module-card .card-icon.green { background: var(--accent-green-dim); color: var(--accent-green); }
.module-card .card-icon.blue { background: var(--accent-blue-dim); color: var(--accent-blue); }
.module-card .card-icon.purple { background: var(--accent-purple-dim); color: var(--accent-purple); }

.module-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.module-card p {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 20px;
  flex: 1;
}

.module-card .card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 6px;
}

.module-card .card-link svg {
  transition: transform 0.2s;
}

.module-card:hover .card-link svg {
  transform: translateX(4px);
}

/* ============================================================
   HIGHLIGHTS BAR
   ============================================================ */

.highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 80px;
}

.highlight-item {
  background: var(--bg-base);
  text-align: center;
  padding: 32px 16px;
}

.highlight-item .number {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent-green);
}

.highlight-item .label {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================================
   CONTENT SECTIONS (doc pages)
   ============================================================ */

.section {
  margin-bottom: 56px;
  scroll-margin-top: 80px;
}

.section h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section h2 .section-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.section h2 .section-icon.green { background: var(--accent-green-dim); color: var(--accent-green); }
.section h2 .section-icon.blue { background: var(--accent-blue-dim); color: var(--accent-blue); }
.section h2 .section-icon.purple { background: var(--accent-purple-dim); color: var(--accent-purple); }
.section h2 .section-icon.amber { background: var(--accent-amber-dim); color: var(--accent-amber); }

.section .section-desc {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 20px;
  max-width: 640px;
}

.feature-list {
  list-style: none;
  display: grid;
  gap: 10px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--text-secondary);
  transition: border-color 0.2s;
}

.feature-list li:hover {
  border-color: var(--border-glow);
}

.feature-list li svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent-green);
}

.feature-list li strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Two-column feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* Page title header */
.page-header {
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 8px;
}

.page-header .subtitle {
  color: var(--text-secondary);
  font-size: 18px;
}

.page-header .tag {
  display: inline-block;
  background: var(--accent-green-dim);
  color: var(--accent-green);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  margin-top: 12px;
}

/* ============================================================
   ROLE BADGE TABLE
   ============================================================ */

.role-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.role-table th,
.role-table td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}

.role-table th {
  background: var(--bg-card);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.role-table td {
  color: var(--text-secondary);
}

.role-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
}

.role-badge.green { background: var(--accent-green-dim); color: var(--accent-green); }
.role-badge.blue { background: var(--accent-blue-dim); color: var(--accent-blue); }
.role-badge.purple { background: var(--accent-purple-dim); color: var(--accent-purple); }
.role-badge.amber { background: var(--accent-amber-dim); color: var(--accent-amber); }

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}

.footer a {
  color: var(--text-secondary);
}

/* ============================================================
   MOBILE RESPONSIVE
   ============================================================ */

@media (max-width: 1024px) {
  .modules-grid { grid-template-columns: 1fr; max-width: 480px; }
  .highlights { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .top-nav { padding: 0 16px; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border);
    padding: 8px;
  }
  .hamburger { display: block; }

  .hero h1 { font-size: 32px; }
  .hero p { font-size: 17px; }
  .hero { padding: 60px 16px 40px; }

  /* Sidebar becomes top drawer */
  .sidebar {
    position: fixed;
    top: 64px;
    left: -280px;
    width: 260px;
    transition: left 0.3s ease;
  }
  .sidebar.open { left: 0; }
  .sidebar-toggle {
    display: block;
    position: fixed;
    top: 72px;
    left: 8px;
    z-index: 60;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: 6px 10px;
    cursor: pointer;
    font-size: 14px;
  }
  .main-content {
    margin-left: 0;
    padding: 24px 16px 60px;
  }
  .page-header h1 { font-size: 28px; }
  .section h2 { font-size: 22px; }
}

@media (min-width: 769px) {
  .sidebar-toggle { display: none; }
}

/* ============================================================
   PLATFORM FEATURES (landing)
   ============================================================ */

.platform-section {
  max-width: 1100px;
  margin: 0 auto 80px;
  padding: 0 24px;
}

.platform-section h2 {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
}

.platform-section .section-sub {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 17px;
}

.platform-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.platform-feature {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.platform-feature h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.platform-feature p {
  color: var(--text-secondary);
  font-size: 14px;
}

@media (max-width: 768px) {
  .platform-features { grid-template-columns: 1fr; }
  .highlights { grid-template-columns: 1fr; }
}

/* ============================================================
   FEATURE CARDS (doc pages)
   ============================================================ */

.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: var(--border-glow);
}

.feature-card .card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.feature-card .card-icon.green { background: var(--accent-green-dim); color: var(--accent-green); }
.feature-card .card-icon.blue { background: var(--accent-blue-dim); color: var(--accent-blue); }
.feature-card .card-icon.purple { background: var(--accent-purple-dim); color: var(--accent-purple); }
.feature-card .card-icon.amber { background: var(--accent-amber-dim); color: var(--accent-amber); }

.feature-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .card-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   PAGE FOOTER (doc pages)
   ============================================================ */

.page-footer {
  margin-top: 60px;
  padding: 32px 0;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}

.page-footer .footer-links {
  margin-top: 12px;
  display: flex;
  gap: 16px;
}

.page-footer .footer-links a {
  color: var(--text-secondary);
  font-size: 13px;
}

/* tag color variants */
.page-header .tag.blue { background: var(--accent-blue-dim); color: var(--accent-blue); }
.page-header .tag.purple { background: var(--accent-purple-dim); color: var(--accent-purple); }
.page-header .tag.amber { background: var(--accent-amber-dim); color: var(--accent-amber); }

/* ============================================================
   NAV DROPDOWN (Guides menu)
   ============================================================ */

.nav-dropdown {
  position: relative;
}

.nav-dropdown .nav-dropdown-trigger {
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  display: inline-block;
}

.nav-dropdown .nav-dropdown-trigger:hover,
.nav-dropdown .nav-dropdown-trigger.active {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-dropdown .dropdown-menu {
  display: none;
  position: absolute;
  top: 40px;
  right: 0;
  min-width: 220px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 0;
  z-index: 200;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.nav-dropdown:hover .dropdown-menu {
  display: block;
}

.nav-dropdown .dropdown-menu a {
  display: block;
  padding: 10px 18px;
  color: var(--text-secondary);
  font-size: 14px;
  border-left: none;
  transition: all 0.15s;
}

.nav-dropdown .dropdown-menu a:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .nav-dropdown .dropdown-menu {
    display: block;
    position: static;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0;
    min-width: 0;
  }
  .nav-dropdown .dropdown-menu a {
    padding: 8px 16px 8px 32px;
    font-size: 13px;
  }
}

/* ============================================================
   GUIDE-SPECIFIC STYLES
   ============================================================ */

/* Numbered steps list */
.steps-list {
  list-style: none;
  display: grid;
  gap: 10px;
  counter-reset: step-counter;
  margin-bottom: 20px;
}

.steps-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--text-secondary);
  counter-increment: step-counter;
  transition: border-color 0.2s;
  line-height: 1.6;
}

.steps-list li:hover {
  border-color: var(--border-glow);
}

.steps-list li::before {
  content: counter(step-counter);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  background: var(--accent-green-dim);
  color: var(--accent-green);
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.steps-list li strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Role callout tip box */
.role-tip {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-green);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.role-tip.blue { border-left-color: var(--accent-blue); }
.role-tip.amber { border-left-color: var(--accent-amber); }
.role-tip.purple { border-left-color: var(--accent-purple); }

.role-tip strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Guide sub-section heading */
.guide-subsection {
  margin-top: 28px;
  margin-bottom: 14px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.guide-subsection::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 18px;
  background: var(--accent-green);
  border-radius: 2px;
}

/* Sidebar group separator label */
.sidebar-group {
  padding: 16px 20px 6px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* CTA banner linking to user guide */
.guide-cta {
  margin: 48px 0 0;
  padding: 20px 24px;
  background: var(--accent-green-dim);
  border: 1px solid var(--accent-green);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 15px;
  color: var(--text-secondary);
}

.guide-cta a {
  font-weight: 600;
  color: var(--accent-green);
  white-space: nowrap;
}

@media (max-width: 768px) {
  .guide-cta {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
}

/* ============================================================
   SCREENSHOT IMAGES
   ============================================================ */

.screenshot {
  margin: 24px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  max-width: 100%;
  box-sizing: border-box;
}

.screenshot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.screenshot-caption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }