/* ============================================================
   B2BEA.org — Master Stylesheet
   Brand: Dark Blue #00196C · Carmine Pink #EB5444
   Fonts: Hanken Grotesk (headings) · Open Sans (body)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Hanken+Grotesk:wght@600;700&family=Open+Sans:ital,wght@0,300;0,400;0,600;1,400&display=swap');

/* ------------------------------------------------------------
   CSS Variables — Brand Tokens
   ------------------------------------------------------------ */
:root {
  /* Colors */
  --color-blue:        #00196C;
  --color-blue-dark:   #001458;
  --color-pink:        #EB5444;
  --color-pink-dark:   #d94333;
  --color-white:       #FFFFFF;
  --color-gray-light:  #F5F5F5;
  --color-gray-mid:    #6B6B6B;
  --color-gray-border: #E0E0E0;
  --color-text:        #1A1A1A;

  /* Typography */
  --font-heading: 'Hanken Grotesk', sans-serif;
  --font-body:    'Open Sans', sans-serif;

  /* Spacing scale */
  --space-xs:   4px;
  --space-sm:   8px;
  --space-md:   16px;
  --space-lg:   24px;
  --space-xl:   40px;
  --space-2xl:  64px;
  --space-3xl:  96px;

  /* Layout */
  --max-width:        1200px;
  --content-width:    800px;
  --nav-height:       72px;
  --border-radius:    8px;
  --border-radius-sm: 4px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 25, 108, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 25, 108, 0.12);
}

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

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.75;
  min-height: 100vh;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--color-pink);
}

/* ------------------------------------------------------------
   Typography
   ------------------------------------------------------------ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-blue);
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3rem);   margin-bottom: var(--space-lg); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: var(--space-md); margin-top: var(--space-2xl); }
h3 { font-size: 1.25rem;                  margin-bottom: var(--space-sm); margin-top: var(--space-xl); font-weight: 600; }
h4 { font-size: 1rem;                     margin-bottom: var(--space-sm); font-weight: 600; }

p {
  margin-bottom: var(--space-md);
  max-width: 70ch;
}

p:last-child { margin-bottom: 0; }

strong { font-weight: 600; }

/* ------------------------------------------------------------
   Layout Utilities
   ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: var(--content-width);
}

.section {
  padding: var(--space-3xl) 0;
}

.section--sm {
  padding: var(--space-2xl) 0;
}

.section--gray {
  background: var(--color-gray-light);
}

.section--blue {
  background: var(--color-blue);
  color: var(--color-white);
}

.section--blue h1,
.section--blue h2,
.section--blue h3 {
  color: var(--color-white);
}

/* ------------------------------------------------------------
   Site Header — Two-Bar Navigation
   ------------------------------------------------------------ */

/* ── Shared header wrapper ─────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
}

/* ── Bar 1: Top ecosystem bar ──────────────────────────────── */
.topbar {
  background: var(--color-blue);
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.75rem;
  line-height: 1;
}

.topbar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 8px var(--space-lg);
  flex-wrap: wrap;
}

.topbar__label {
  font-family: var(--font-heading);
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.topbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.topbar__link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  transition: color 0.15s;
}

.topbar__link:hover {
  color: var(--color-white);
}

.topbar__divider {
  color: rgba(255, 255, 255, 0.3);
}

/* ── Bar 2: Main nav ───────────────────────────────────────── */
.mainnav {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

.mainnav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  gap: var(--space-lg);
}

/* Logo */
.mainnav__logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  text-decoration: none;
}

.mainnav__logo img {
  height: 36px;
  width: auto;
}

/* Links wrapper */
.mainnav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex: 1;
}

/* Separator between Explore dropdown and main links */
.mainnav__sep {
  width: 1px;
  height: 20px;
  background: var(--color-gray-border);
}

/* Plain nav links */
.mainnav__link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s;
}

.mainnav__link:hover {
  color: var(--color-blue);
}

/* Action buttons pushed to the right */
.mainnav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-left: auto;
}

.mainnav__btn {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 9px 18px;
  border-radius: var(--border-radius-sm);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.mainnav__btn--primary {
  background: var(--color-pink);
  color: var(--color-white);
}

.mainnav__btn--primary:hover {
  background: var(--color-pink-dark);
  color: var(--color-white);
}

.mainnav__btn--ghost {
  background: transparent;
  color: var(--color-blue);
  border: 1.5px solid var(--color-blue);
}

.mainnav__btn--ghost:hover {
  background: var(--color-blue);
  color: var(--color-white);
}

/* ── Explore Dropdown ──────────────────────────────────────── */
.mainnav__dropdown {
  position: relative;
}

.mainnav__dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text);
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 2px;
  white-space: nowrap;
  transition: color 0.15s;
}

.mainnav__dropdown-trigger:hover {
  color: var(--color-blue);
}

.mainnav__chevron {
  transition: transform 0.2s;
}

.mainnav__dropdown-trigger[aria-expanded="true"] .mainnav__chevron {
  transform: rotate(180deg);
}

.mainnav__dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  min-width: 260px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  z-index: 200;
}

.mainnav__dropdown-menu.is-open {
  display: block;
}

.mainnav__dropdown-item {
  display: flex;
  flex-direction: column;
  padding: 12px 16px;
  text-decoration: none;
  border-bottom: 1px solid var(--color-gray-border);
  transition: background 0.1s;
}

.mainnav__dropdown-item:last-child {
  border-bottom: none;
}

.mainnav__dropdown-item:hover {
  background: var(--color-gray-light);
}

.mainnav__dropdown-item strong {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-blue);
  display: block;
}

.mainnav__dropdown-item span {
  font-size: 0.8rem;
  color: var(--color-gray-mid);
  margin-top: 2px;
}

/* Mobile toggle button */
.mainnav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--color-blue);
  flex-shrink: 0;
}

/* ------------------------------------------------------------
   Hero Section
   ------------------------------------------------------------ */
.hero {
  background: var(--color-blue);
  color: var(--color-white);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero__subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ------------------------------------------------------------
   Buttons
   ------------------------------------------------------------ */
.btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: var(--border-radius-sm);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  line-height: 1;
}

.btn--primary {
  background: var(--color-blue);
  color: var(--color-white);
}
.btn--primary:hover {
  background: var(--color-blue-dark);
  color: var(--color-white);
}

.btn--accent {
  background: var(--color-pink);
  color: var(--color-white);
}
.btn--accent:hover {
  background: var(--color-pink-dark);
  color: var(--color-white);
}

.btn--outline {
  background: transparent;
  color: var(--color-blue);
  border-color: var(--color-blue);
}
.btn--outline:hover {
  background: var(--color-blue);
  color: var(--color-white);
}

.btn--outline-white {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.6);
}
.btn--outline-white:hover {
  background: var(--color-white);
  color: var(--color-blue);
  border-color: var(--color-white);
}

/* ------------------------------------------------------------
   Cards
   ------------------------------------------------------------ */
.card {
  background: var(--color-white);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-gray-border);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.card--accent {
  border-left: 4px solid var(--color-pink);
}

.card--blue {
  border-top: 3px solid var(--color-blue);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

/* ------------------------------------------------------------
   Callout / Highlight Boxes
   ------------------------------------------------------------ */
.callout {
  background: var(--color-gray-light);
  border-left: 4px solid var(--color-pink);
  padding: var(--space-lg) var(--space-xl);
  margin: var(--space-xl) 0;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.callout__title {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-blue);
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.callout p {
  color: var(--color-gray-mid);
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* Pull quote variant */
.pullquote {
  border-left: 4px solid var(--color-blue);
  padding: var(--space-md) var(--space-xl);
  margin: var(--space-xl) 0;
  font-size: 1.2rem;
  font-style: italic;
  color: var(--color-blue);
  font-family: var(--font-heading);
  font-weight: 600;
}

/* ------------------------------------------------------------
   Blog / Article
   ------------------------------------------------------------ */
.article-header {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--color-gray-border);
  margin-bottom: var(--space-2xl);
}

.article-header__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-pink);
  margin-bottom: var(--space-md);
}

.article-header__meta {
  font-size: 0.875rem;
  color: var(--color-gray-mid);
  margin-top: var(--space-md);
}

.article-body h2 { margin-top: var(--space-2xl); }
.article-body h3 { margin-top: var(--space-xl); }

.article-body p,
.article-body li {
  font-size: 1.05rem;
  line-height: 1.8;
}

/* YouTube embed */
.video-embed {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  margin: var(--space-xl) 0;
  border-radius: var(--border-radius);
}

.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Blog listing card */
.blog-card {
  display: block;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-gray-border);
  text-decoration: none;
  color: var(--color-text);
  transition: transform 0.15s;
}
.blog-card:hover { transform: translateX(4px); }
.blog-card:hover .blog-card__title { color: var(--color-pink); }

.blog-card__tag {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-pink);
  margin-bottom: var(--space-xs);
}

.blog-card__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-blue);
  margin-bottom: var(--space-sm);
  transition: color 0.15s;
}

.blog-card__excerpt {
  color: var(--color-gray-mid);
  font-size: 0.95rem;
  line-height: 1.6;
}

.blog-card__meta {
  font-size: 0.8rem;
  color: var(--color-gray-mid);
  margin-top: var(--space-sm);
}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.footer {
  background: var(--color-blue);
  color: rgba(255, 255, 255, 0.75);
  padding: var(--space-2xl) 0 var(--space-xl);
  margin-top: var(--space-3xl);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.footer__tagline {
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 280px;
}

.footer__heading {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__links a {
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.15s;
}

.footer__links a:hover { color: var(--color-white); }

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  :root {
    --space-3xl: 64px;
    --space-2xl: 48px;
  }

  /* ── Mobile nav ─────────────────────────────────── */
  .topbar__label { display: none; }

  .mainnav__toggle { display: block; }

  .mainnav__links {
    display: none;
    position: absolute;
    top: calc(var(--nav-height) + 33px); /* bar1 height ~33px + bar2 */
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-gray-border);
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
    z-index: 150;
  }

  .mainnav__links.is-open { display: flex; }

  .mainnav__sep { display: none; }

  .mainnav__dropdown { width: 100%; }
  .mainnav__dropdown-menu {
    position: static;
    box-shadow: none;
    border: 1px solid var(--color-gray-border);
    border-radius: var(--border-radius);
    margin-top: 8px;
  }

  .mainnav__actions {
    margin-left: 0;
    flex-wrap: wrap;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .footer__inner {
    grid-template-columns: 1fr;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
}