/* ============================================
   BK Advisors — Design System & Custom Styles
   ============================================ */

/* --- Design Tokens (CSS Custom Properties) --- */
:root {
  /* Color Palette */
  --color-primary: #1a1a4e;
  --color-primary-light: #2d2d7b;
  --color-accent: #0ea5a0;
  --color-accent-light: #14c8c2;
  --color-gradient-start: #1a1a4e;
  --color-gradient-end: #0ea5a0;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f1f5f9;
  --color-bg-dark: #0f172a;

  /* Typography */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Effects */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-blur: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
  --shadow-hover: 0 20px 60px rgba(0, 0, 0, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Global Base --- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-primary);
}

section {
  padding: 6rem 0;
}

/* Section title with gradient underline */
.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  margin: 0.75rem auto 0;
  border-radius: 2px;
}

.section-title.text-start::after {
  margin-left: 0;
  margin-right: auto;
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 3rem;
}

/* Alternate section backgrounds */
.bg-alt {
  background-color: var(--color-bg-alt);
}

.bg-gradient-subtle {
  background: linear-gradient(
    135deg,
    rgba(26, 26, 78, 0.03) 0%,
    rgba(14, 165, 160, 0.05) 100%
  );
}

/* Bootstrap overrides */
.btn-outline-primary {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline-primary:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
  background: transparent !important;
  transition: var(--transition);
  transition-property: background, padding, box-shadow, backdrop-filter;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.85) !important;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  padding: 0.5rem 0;
  box-shadow: var(--shadow-sm);
}

.navbar-brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
  color: #fff !important;
  transition: color var(--transition);
}

.navbar-brand img {
  transition: var(--transition);
}

.navbar.scrolled .navbar-brand {
  color: var(--color-primary) !important;
}

.navbar .nav-link {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition);
  padding: 0.5rem 1rem;
}

.navbar.scrolled .nav-link {
  color: var(--color-text);
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: var(--color-accent);
}

.navbar-toggler {
  border-color: rgba(255, 255, 255, 0.5);
}

.navbar .navbar-toggler-icon {
  filter: invert(1);
}

.navbar.scrolled .navbar-toggler-icon {
  filter: none;
}

.navbar.scrolled .navbar-toggler {
  border-color: rgba(0, 0, 0, 0.2);
}

/* --- Hero Section --- */
.hero-section {
  background: url('assets/network-bg.jpg') no-repeat center center/cover;
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(26, 26, 78, 0.85) 0%,
    rgba(14, 165, 160, 0.6) 100%
  );
  z-index: 1;
}

.hero-section .container {
  position: relative;
  z-index: 2;
}

.hero-section h1 {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-section .lead {
  font-size: 1.35rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1rem;
  font-weight: 300;
}

.hero-section .hero-sub {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.6);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.btn-hero {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  color: #fff;
  border: none;
  padding: 0.85rem 2.5rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(14, 165, 160, 0.4);
}

.btn-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(14, 165, 160, 0.5);
  color: #fff;
}

/* --- Service Cards --- */
.service-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border) !important;
  border-radius: var(--radius-md);
  transition: var(--transition);
  transition-property: transform, box-shadow;
  box-shadow: var(--shadow-sm);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.service-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.service-icon i {
  font-size: 2rem;
  color: #fff;
}

.service-card .card-title {
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: 1rem;
}

.service-card .card-text {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* --- Blog Cards --- */
.blog-card {
  border: none;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.blog-card .card-img-wrapper {
  overflow: hidden;
}

.blog-card .card-img-top {
  height: 220px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.blog-card:hover .card-img-top {
  transform: scale(1.05);
}

.blog-card .card-title {
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-weight: 600;
}

/* --- Client Logos --- */
.client-logo {
  max-height: 80px;
  filter: grayscale(100%);
  opacity: 0.6;
  transition: var(--transition);
}

.client-logo:hover {
  filter: grayscale(0%);
  opacity: 1;
  transform: scale(1.08);
}

/* --- Contact Cards --- */
.contact-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.contact-card h5 {
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.contact-card a {
  color: var(--color-accent);
}

.contact-card a:hover {
  color: var(--color-accent-light);
}

.contact-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
}

.contact-icon i {
  font-size: 1.5rem;
  color: #fff;
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 4rem 0 2rem;
}

.footer h5 {
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.footer p,
.footer li {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

.footer a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition);
}

.footer a:hover {
  color: var(--color-accent);
}

.footer-divider {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 3rem;
  padding-top: 1.5rem;
}

.footer .social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  margin-right: 0.5rem;
  transition: var(--transition);
}

.footer .social-icon:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
}

/* --- Blog Page Styles --- */
.blog-header {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  padding: 8rem 0 4rem;
}

.blog-header h1 {
  color: #fff;
}

.blog-header .lead {
  color: rgba(255, 255, 255, 0.8);
}

.nav-pills .nav-link {
  color: var(--color-text-muted);
  font-weight: 500;
  margin: 0 0.25rem;
  border-radius: 50px;
  padding: 0.5rem 1.25rem;
  transition: var(--transition);
}

.nav-pills .nav-link.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

.nav-pills .nav-link:hover:not(.active) {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.card-img-top {
  height: 200px;
  object-fit: cover;
}

.badge {
  font-weight: 500;
  padding: 0.5em 1em;
}

.badge.bg-primary {
  background: var(--color-primary) !important;
}

.badge.bg-success {
  background: var(--color-accent) !important;
}

.badge.bg-info {
  background: var(--color-accent-light) !important;
}

.featured-post img {
  height: 300px;
  object-fit: cover;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero-section h1 {
    font-size: 2.25rem;
  }

  .hero-section .lead {
    font-size: 1.1rem;
  }

  section {
    padding: 4rem 0;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .contact-card {
    margin-bottom: 1rem;
  }

  .blog-header {
    padding: 7rem 0 3rem;
  }
}

@media (max-width: 992px) {
  .navbar-collapse {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-top: 0.5rem;
  }

  .navbar-collapse .nav-link {
    color: var(--color-text) !important;
  }
}