/* 
 * coldemailoutreach.org — 2026 B2B Outbound Deliverability & Modular Stack Architecture
 * Design System: RevOps Midnight Indigo, Slate & Electric Emerald Workbench (.ceo-*)
 */

:root {
  --ceo-bg: #f3f5f9;
  --ceo-surface: #ffffff;
  --ceo-surface-alt: #eef2f8;
  --ceo-dark: #090d16;
  --ceo-dark-card: #111827;
  --ceo-text: #0f172a;
  --ceo-text-muted: #475569;
  --ceo-border: #cbd5e1;
  --ceo-border-subtle: #e2e8f0;
  --ceo-indigo: #4f46e5;
  --ceo-indigo-hover: #4338ca;
  --ceo-indigo-soft: #eef2ff;
  --ceo-emerald: #059669;
  --ceo-emerald-hover: #047857;
  --ceo-emerald-soft: #ecfdf5;
  --ceo-coral: #e11d48;
  --ceo-coral-soft: #fff1f2;
  --ceo-amber: #d97706;
  --ceo-amber-soft: #fffbeb;
  --ceo-radius-sm: 6px;
  --ceo-radius-md: 10px;
  --ceo-radius-lg: 14px;
  --ceo-shadow-sm: 0 1px 3px rgba(9, 13, 22, 0.06);
  --ceo-shadow-md: 0 6px 20px -4px rgba(9, 13, 22, 0.09);
  --ceo-shadow-lg: 0 14px 32px -6px rgba(9, 13, 22, 0.14);
  --ceo-font-head: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --ceo-font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --ceo-font-mono: 'Space Mono', 'SFMono-Regular', Consolas, monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--ceo-font-body);
  background-color: var(--ceo-bg);
  color: var(--ceo-text);
  line-height: 1.65;
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

h1, h2, h3, h4 {
  font-family: var(--ceo-font-head);
  color: var(--ceo-dark);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.85rem, 3.8vw, 2.85rem);
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.4rem, 2.5vw, 1.95rem);
  margin-top: 2.4rem;
  margin-bottom: 0.9rem;
  padding-bottom: 0.45rem;
  border-bottom: 2px solid var(--ceo-border-subtle);
}

h3 {
  font-size: clamp(1.15rem, 1.9vw, 1.38rem);
  margin-top: 1.65rem;
  margin-bottom: 0.65rem;
}

p {
  margin-bottom: 1.1rem;
  color: var(--ceo-text);
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.45rem;
}

a {
  color: var(--ceo-indigo);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--ceo-indigo-hover);
}

code, pre, .ceo-mono {
  font-family: var(--ceo-font-mono);
  font-size: 0.88em;
}

code {
  background: var(--ceo-surface-alt);
  color: var(--ceo-dark);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--ceo-border-subtle);
  word-break: break-word;
}

.ceo-container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header & Navigation */
.ceo-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(9, 13, 22, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

.ceo-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 1rem;
}

.ceo-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--ceo-font-head);
  font-weight: 800;
  font-size: 1.15rem;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.ceo-brand:hover {
  color: #ffffff;
}

.ceo-brand-dot {
  display: inline-block;
  width: 11px;
  height: 11px;
  border-radius: 3px;
  background: linear-gradient(135deg, #10b981, #4f46e5);
}

.ceo-brand-tag {
  font-family: var(--ceo-font-mono);
  font-size: 0.68rem;
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  border: 1px solid rgba(52, 211, 153, 0.35);
}

.ceo-nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.ceo-nav-links a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.ceo-nav-links a:hover {
  color: #ffffff;
}

.ceo-nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.ceo-menu-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--ceo-radius-sm);
  padding: 0.45rem 0.7rem;
  font-family: var(--ceo-font-mono);
  font-size: 0.8rem;
  cursor: pointer;
}

/* Buttons */
.ceo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.68rem 1.2rem;
  border-radius: var(--ceo-radius-sm);
  font-family: var(--ceo-font-head);
  font-weight: 600;
  font-size: 0.93rem;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.16s ease;
  line-height: 1.25;
  text-align: center;
}

.ceo-btn-emerald {
  background-color: var(--ceo-emerald);
  color: #ffffff;
}

.ceo-btn-emerald:hover {
  background-color: var(--ceo-emerald-hover);
  color: #ffffff;
}

.ceo-btn-indigo {
  background-color: var(--ceo-indigo);
  color: #ffffff;
}

.ceo-btn-indigo:hover {
  background-color: var(--ceo-indigo-hover);
  color: #ffffff;
}

.ceo-btn-coral {
  background-color: var(--ceo-coral);
  color: #ffffff;
}

.ceo-btn-coral:hover {
  background-color: #be123c;
  color: #ffffff;
}

.ceo-btn-outline {
  background-color: var(--ceo-surface);
  color: var(--ceo-dark);
  border-color: var(--ceo-border);
}

.ceo-btn-outline:hover {
  border-color: var(--ceo-indigo);
  color: var(--ceo-indigo);
}

.ceo-btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
}

.ceo-btn-block {
  display: flex;
  width: 100%;
}

/* Hero Workbench */
.ceo-hero {
  background: radial-gradient(circle at 85% 15%, rgba(79, 70, 229, 0.22), transparent 45%),
              radial-gradient(circle at 15% 80%, rgba(5, 150, 105, 0.18), transparent 45%),
              var(--ceo-dark);
  color: #ffffff;
  padding: 3.5rem 0 3.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.ceo-hero h1 {
  color: #ffffff;
  max-width: 920px;
}

.ceo-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--ceo-font-mono);
  font-size: 0.78rem;
  background: rgba(16, 185, 129, 0.14);
  color: #34d399;
  border: 1px solid rgba(52, 211, 153, 0.35);
  padding: 0.32rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1.1rem;
}

.ceo-hero-sub {
  font-size: 1.08rem;
  color: #cbd5e1;
  max-width: 860px;
  margin-bottom: 1.65rem;
  line-height: 1.68;
}

.ceo-hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.ceo-kpi-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--ceo-radius-md);
  padding: 1.15rem;
}

.ceo-kpi-item {
  padding: 0.25rem 0.5rem;
}

.ceo-kpi-val {
  font-family: var(--ceo-font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: #34d399;
  display: block;
}

.ceo-kpi-label {
  font-size: 0.82rem;
  color: #94a3b8;
}

/* Breadcrumbs */
.ceo-breadcrumbs {
  font-family: var(--ceo-font-mono);
  font-size: 0.8rem;
  color: var(--ceo-text-muted);
  padding: 0.9rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.ceo-breadcrumbs a {
  color: var(--ceo-indigo);
  text-decoration: none;
}

/* Sections & Cards */
.ceo-section {
  padding: 2.75rem 0;
}

.ceo-card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.35rem;
  margin: 1.5rem 0;
}

.ceo-card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.35rem;
  margin: 1.5rem 0;
}

.ceo-card {
  background: var(--ceo-surface);
  border: 1px solid var(--ceo-border);
  border-radius: var(--ceo-radius-md);
  padding: 1.5rem;
  box-shadow: var(--ceo-shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ceo-card-highlight {
  border: 2px solid var(--ceo-emerald);
  box-shadow: var(--ceo-shadow-md);
  position: relative;
}

.ceo-layer-pill {
  display: inline-block;
  font-family: var(--ceo-font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.22rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
  width: fit-content;
}

.ceo-pill-layer1 {
  background: var(--ceo-coral-soft);
  color: var(--ceo-coral);
  border: 1px solid rgba(225, 29, 72, 0.25);
}

.ceo-pill-layer2 {
  background: var(--ceo-amber-soft);
  color: var(--ceo-amber);
  border: 1px solid rgba(217, 119, 6, 0.25);
}

.ceo-pill-layer3 {
  background: var(--ceo-emerald-soft);
  color: var(--ceo-emerald);
  border: 1px solid rgba(5, 150, 105, 0.25);
}

.ceo-price-tag {
  font-family: var(--ceo-font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ceo-dark);
  margin: 0.6rem 0;
}

/* 2-Column Workbench Layout for Inner Pages */
.ceo-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 2rem;
  align-items: start;
  padding: 1.75rem 0 3.5rem;
}

.ceo-main-col {
  background: var(--ceo-surface);
  border: 1px solid var(--ceo-border);
  border-radius: var(--ceo-radius-md);
  padding: 2rem;
  box-shadow: var(--ceo-shadow-sm);
  min-width: 0;
}

.ceo-main-col h2:first-of-type {
  margin-top: 1.25rem;
}

.ceo-sticky-rail {
  position: sticky;
  top: 86px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.ceo-rail-box {
  background: var(--ceo-dark);
  color: #ffffff;
  border-radius: var(--ceo-radius-md);
  padding: 1.35rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--ceo-shadow-md);
}

.ceo-rail-box h3 {
  color: #ffffff;
  margin-top: 0;
  font-size: 1.08rem;
  margin-bottom: 0.55rem;
}

.ceo-rail-box p {
  color: #cbd5e1;
  font-size: 0.87rem;
  margin-bottom: 0.9rem;
}

.ceo-rail-layer {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--ceo-radius-sm);
  padding: 0.75rem;
  margin-bottom: 0.7rem;
}

.ceo-rail-layer-title {
  font-family: var(--ceo-font-mono);
  font-size: 0.76rem;
  color: #34d399;
  display: block;
  margin-bottom: 0.2rem;
}

.ceo-rail-layer-desc {
  font-size: 0.82rem;
  color: #e2e8f0;
  margin-bottom: 0.5rem;
}

.ceo-rail-links {
  background: var(--ceo-surface);
  border: 1px solid var(--ceo-border);
  border-radius: var(--ceo-radius-md);
  padding: 1.25rem;
}

.ceo-rail-links h3 {
  margin-top: 0;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.ceo-rail-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ceo-rail-links li {
  margin-bottom: 0.55rem;
  font-size: 0.88rem;
}

/* Interactive Calculator Widget */
.ceo-calc-panel {
  background: var(--ceo-surface);
  border: 2px solid var(--ceo-indigo);
  border-radius: var(--ceo-radius-lg);
  padding: 1.85rem;
  box-shadow: var(--ceo-shadow-md);
  margin: 2rem 0;
}

.ceo-calc-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.75rem;
  align-items: start;
}

.ceo-form-group {
  margin-bottom: 1.15rem;
}

.ceo-form-label {
  display: flex;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 0.4rem;
  color: var(--ceo-dark);
}

.ceo-input, .ceo-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--ceo-border);
  border-radius: var(--ceo-radius-sm);
  font-family: var(--ceo-font-body);
  font-size: 0.95rem;
  background: var(--ceo-bg);
  color: var(--ceo-dark);
}

.ceo-calc-results {
  background: var(--ceo-dark);
  color: #ffffff;
  border-radius: var(--ceo-radius-md);
  padding: 1.5rem;
}

.ceo-calc-results h3 {
  color: #ffffff;
  margin-top: 0;
  margin-bottom: 0.9rem;
}

.ceo-calc-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.9rem;
}

.ceo-calc-row strong {
  font-family: var(--ceo-font-mono);
  color: #34d399;
}

.ceo-calc-total {
  margin-top: 1rem;
  padding: 0.9rem;
  background: rgba(16, 185, 129, 0.14);
  border: 1px solid rgba(52, 211, 153, 0.35);
  border-radius: var(--ceo-radius-sm);
}

/* Tables */
.ceo-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--ceo-border);
  border-radius: var(--ceo-radius-md);
  background: var(--ceo-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

th, td {
  padding: 0.8rem 0.95rem;
  border-bottom: 1px solid var(--ceo-border-subtle);
  vertical-align: top;
}

th {
  background: var(--ceo-dark);
  color: #ffffff;
  font-family: var(--ceo-font-head);
  font-weight: 600;
  font-size: 0.85rem;
  white-space: nowrap;
}

tr:nth-child(even) td {
  background: #f8fafc;
}

/* Honest Trade-offs Callout */
.ceo-tradeoff-box {
  background: var(--ceo-amber-soft);
  border-left: 4px solid var(--ceo-amber);
  border-top: 1px solid rgba(217, 119, 6, 0.25);
  border-right: 1px solid rgba(217, 119, 6, 0.25);
  border-bottom: 1px solid rgba(217, 119, 6, 0.25);
  border-radius: var(--ceo-radius-sm);
  padding: 1.35rem;
  margin: 1.75rem 0;
}

.ceo-tradeoff-box h3 {
  margin-top: 0;
  color: #92400e;
}

.ceo-answer-first {
  background: var(--ceo-indigo-soft);
  border-left: 4px solid var(--ceo-indigo);
  padding: 1.1rem 1.25rem;
  border-radius: var(--ceo-radius-sm);
  margin: 1.15rem 0;
  font-weight: 500;
}

/* FAQ Details */
.ceo-faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin: 1.5rem 0;
}

.ceo-faq-list details {
  background: var(--ceo-surface);
  border: 1px solid var(--ceo-border);
  border-radius: var(--ceo-radius-sm);
  padding: 1rem 1.2rem;
}

.ceo-faq-list summary {
  font-family: var(--ceo-font-head);
  font-weight: 600;
  font-size: 1.02rem;
  cursor: pointer;
  color: var(--ceo-dark);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.ceo-faq-list summary::-webkit-details-marker {
  display: none;
}

.ceo-faq-list summary::after {
  content: "+";
  font-family: var(--ceo-font-mono);
  font-weight: 700;
  color: var(--ceo-indigo);
  flex-shrink: 0;
}

.ceo-faq-list details[open] summary::after {
  content: "−";
}

.ceo-faq-list details p {
  margin-top: 0.8rem;
  margin-bottom: 0;
  color: var(--ceo-text);
}

/* Footer */
.ceo-footer {
  background: var(--ceo-dark);
  color: #94a3b8;
  padding: 3.25rem 0 5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 3rem;
}

.ceo-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2.25rem;
}

.ceo-footer h4 {
  color: #ffffff;
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
}

.ceo-footer p {
  color: #94a3b8;
  font-size: 0.86rem;
}

.ceo-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ceo-footer li {
  margin-bottom: 0.5rem;
  font-size: 0.86rem;
}

.ceo-footer a {
  color: #cbd5e1;
  text-decoration: none;
}

.ceo-footer a:hover {
  color: #34d399;
}

.ceo-footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  font-size: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

/* Responsive Media Queries (Strict Zero Horizontal Overflow on 360px Android) */
@media (max-width: 980px) {
  .ceo-workbench {
    grid-template-columns: 1fr;
  }
  .ceo-sticky-rail {
    position: static;
  }
  .ceo-card-grid-3 {
    grid-template-columns: 1fr;
  }
  .ceo-calc-grid {
    grid-template-columns: 1fr;
  }
  .ceo-kpi-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .ceo-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 760px) {
  .ceo-menu-toggle {
    display: inline-flex;
  }
  .ceo-nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--ceo-dark);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    gap: 0.85rem;
  }
  .ceo-nav-links.ceo-open {
    display: flex;
  }
  .ceo-card-grid-2 {
    grid-template-columns: 1fr;
  }
  .ceo-kpi-strip {
    grid-template-columns: 1fr;
  }
  .ceo-footer-grid {
    grid-template-columns: 1fr;
  }
  .ceo-main-col {
    padding: 1.25rem;
  }
  .ceo-calc-panel {
    padding: 1.2rem;
  }
  .ceo-hero {
    padding: 2.25rem 0;
  }
  .ceo-nav-actions .ceo-btn {
    padding: 0.45rem 0.7rem;
    font-size: 0.78rem;
  }
}