/* ==========================================================================
   IVA Online - Custom Design System
   Based on professional UK financial services design
   Background: Black with Teal accents
   ========================================================================== */

/* ==========================================================================
   CSS VARIABLES
   ========================================================================== */

:root {
  /* Professional Teal Brand Colors */
  --color-brand-primary: #0D9488;
  --color-brand-light: #F0FDFA;
  --color-brand-accent: #14B8A6;
  --color-brand-dark: #115E59;

  /* Background Colors - Black Theme */
  --color-bg: #000000;
  --color-bg-secondary: #0a0a0a;
  --color-bg-tertiary: #111111;
  --color-bg-card: #1a1a1a;
  --color-bg-footer: #050505;

  /* Border Colors */
  --color-border: #333333;
  --color-border-light: #222222;

  /* Text Colors - High Contrast on Black */
  --color-heading-h1: #ffffff;
  --color-heading-h2: #f5f5f5;
  --color-heading-h3: #e5e5e5;
  --color-text-primary: #d4d4d4;
  --color-text-secondary: #a3a3a3;
  --color-text-muted: #737373;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-h1: 40px;
  --line-height-h1: 48px;
  --font-weight-h1: 800;
  --font-size-h2: 28px;
  --line-height-h2: 36px;
  --font-weight-h2: 700;
  --font-size-h3: 20px;
  --line-height-h3: 28px;
  --font-weight-h3: 600;
  --font-size-body: 17px;
  --line-height-body: 1.7;
  --font-size-small: 14px;

  /* Spacing */
  --space-section: 60px;
  --space-after-h1: 24px;
  --space-before-h2: 48px;
  --space-after-h2: 16px;
  --space-paragraph: 20px;
  --content-max-width: 1400px;
  --nav-height: 70px;

  /* Radius */
  --border-radius: 8px;
  --border-radius-sm: 6px;
  --border-radius-lg: 12px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ==========================================================================
   GLOBAL STYLES
   ========================================================================== */

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

html,
body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  overflow-x: hidden;
  width: 100%;
  max-width: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Text alignment - left by default, centered for hero and section titles */
h2, h3, h4, h5, h6, p, ul, ol, li,
article, .prose, .article-content {
  text-align: left !important;
}

/* Hero and section titles are centered */
.hero h1,
.hero p,
.section-title {
  text-align: center !important;
}

/* Links */
a {
  color: var(--color-brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1 {
  font-size: var(--font-size-h1);
  line-height: var(--line-height-h1);
  font-weight: var(--font-weight-h1);
  color: var(--color-heading-h1);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-after-h1);
}

h2 {
  font-size: var(--font-size-h2);
  line-height: var(--line-height-h2);
  font-weight: var(--font-weight-h2);
  color: var(--color-heading-h2);
  letter-spacing: -0.015em;
  margin-top: var(--space-before-h2);
  margin-bottom: var(--space-after-h2);
  border-left: 4px solid var(--color-brand-primary);
  padding-left: 20px;
}

h2:first-child {
  margin-top: 40px;
}

h3 {
  font-size: var(--font-size-h3);
  line-height: var(--line-height-h3);
  font-weight: var(--font-weight-h3);
  color: var(--color-heading-h3);
  margin: 2rem 0 1rem;
}

p {
  margin-bottom: var(--space-paragraph);
  color: var(--color-text-primary);
}

ul, ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

/* ==========================================================================
   HEADER & NAVIGATION - Professional Header System
   ========================================================================== */

.professional-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 3px rgba(13, 148, 136, 0.1);
}

.header-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

/* ================================================
   LOGO / BRANDING
   ================================================ */

.site-branding .site-logo {
  text-decoration: none;
  color: #0D9488;
}

.site-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #0D9488;
}

.logo-image {
  display: block;
  height: 40px;
  width: auto;
  transition: opacity 150ms ease;
}

.site-logo:hover .logo-image {
  opacity: 0.8;
}

/* ================================================
   DESKTOP NAVIGATION
   ================================================ */

.desktop-nav {
  display: none;
}

@media (min-width: 768px) {
  .desktop-nav {
    display: block;
  }
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: #a3a3a3;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.15s ease;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: #0D9488;
}

.nav-link.active {
  color: #0D9488;
  border-bottom-color: #0D9488;
}

/* ================================================
   CTA BUTTON
   ================================================ */

.header-cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  background: #0D9488 !important;
  color: #ffffff !important;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s ease;
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  white-space: nowrap;
  border: none;
  line-height: 1.5;
  text-align: center;
}

.header-cta-button:hover {
  background: #115E59 !important;
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

@media (max-width: 767px) {
  .header-inner > .header-cta-button {
    display: none;
  }
}

/* ================================================
   MOBILE MENU TOGGLE (HAMBURGER)
   ================================================ */

.mobile-menu-toggle {
  display: block;
  background: none;
  border: none;
  color: #ffffff;
  cursor: pointer;
  padding: 8px;
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.menu-icon {
  display: block;
}

/* ================================================
   MOBILE NAVIGATION PANEL
   ================================================ */

.mobile-nav {
  display: none;
  background: #000000;
  border-top: 1px solid #333333;
  padding: 16px 0;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ================================================
   MOBILE ACCORDION ITEMS
   ================================================ */

.mobile-nav-item {
  border-bottom: 1px solid #222222;
}

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

.mobile-nav-link {
  display: block;
  padding: 12px 24px 12px 40px;
  color: #a3a3a3;
  text-decoration: none;
  font-size: 15px;
  font-weight: 400;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: #0D9488;
}

/* ================================================
   MOBILE CTA BUTTON
   ================================================ */

.mobile-nav-cta {
  border-bottom: none !important;
  padding: 16px 24px 0;
}

.mobile-nav-cta .header-cta-button {
  width: 100%;
  padding: 12px 20px;
  font-size: 16px;
  justify-content: center;
}

/* ================================================
   RESPONSIVE ADJUSTMENTS
   ================================================ */

@media (min-width: 768px) {
  .desktop-nav {
    display: block;
  }

  .mobile-menu-toggle {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }
}

@media (max-width: 767px) {
  .desktop-nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: block;
  }
}

@media (max-width: 639px) {
  .header-container {
    padding: 0 16px;
  }

  .logo-image {
    height: 32px;
  }
}

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

.hero {
  text-align: center;
  padding: var(--space-section) 24px;
  margin-bottom: var(--space-section);
  background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  color: var(--color-heading-h1);
  text-align: center !important;
}

.hero p {
  font-size: 20px;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto var(--space-after-h1);
  line-height: 1.6;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

/* Copy working button style from "Learn about IVAs" */
.btn {
  display: inline-block;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  text-align: center;
  vertical-align: middle;
  line-height: 1.5;
}

.btn.primary {
  background-color: var(--color-brand-primary);
  color: #ffffff !important;
}

.btn.primary:hover {
  background-color: var(--color-brand-dark);
  color: #ffffff !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(13, 148, 136, 0.4);
}

/* Bright variant - more vibrant */
.btn.primary.bright {
  background-color: var(--color-brand-accent);
  color: #ffffff !important;
  box-shadow: 0 0 20px rgba(20, 184, 166, 0.3);
}

.btn.primary.bright:hover {
  background-color: var(--color-brand-primary);
  color: #ffffff !important;
  box-shadow: 0 4px 20px rgba(20, 184, 166, 0.5);
  transform: translateY(-2px);
}

.btn.secondary {
  background-color: transparent;
  color: var(--color-brand-accent);
  border: 2px solid var(--color-brand-accent);
}

.btn.secondary:hover {
  border-color: var(--color-brand-primary);
  color: #ffffff !important;
  background-color: var(--color-brand-primary);
}

/* ==========================================================================
   MAIN CONTENT CONTAINER
   ========================================================================== */

main {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px var(--space-section);
}

.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   CONTENT SECTIONS
   ========================================================================== */

.content-section {
  padding: var(--space-section) 0;
  margin-bottom: var(--space-section);
}

.section-title {
  text-align: center !important;
  font-size: 32px;
  font-weight: 700;
  color: var(--color-heading-h1);
  margin-bottom: 48px;
  border-left: none !important;
  padding-left: 0 !important;
  margin-top: 0;
}

/* Section Grid */
.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.section-grid-small {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

/* ==========================================================================
   CARDS
   ========================================================================== */

.section-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 32px 24px;
  transition: all var(--transition-normal);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.section-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(13, 148, 136, 0.15);
  border-color: var(--color-brand-primary);
}

.section-card h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 16px 0;
  border-left: none;
  padding-left: 0;
  color: var(--color-heading-h2);
  text-align: left !important;
}

.section-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 12px 0;
  color: var(--color-heading-h3);
  text-align: left !important;
}

.section-card p {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  flex-grow: 1;
  line-height: 1.6;
}

.section-card.highlight {
  border: 2px solid var(--color-brand-primary);
  background: linear-gradient(135deg, var(--color-bg-card) 0%, rgba(13, 148, 136, 0.05) 100%);
}

/* Read More Link */
.read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-brand-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: all var(--transition-fast);
  margin-top: auto;
}

.read-more:hover {
  color: var(--color-brand-accent);
  gap: 10px;
}

.read-more::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.read-more:hover::after {
  transform: translateX(4px);
}

/* ==========================================================================
   CTA BOXES
   ========================================================================== */

.cta-box {
  background: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-dark) 100%);
  border-radius: var(--border-radius);
  padding: 48px 32px;
  margin: var(--space-section) 0;
  box-shadow: 0 8px 24px rgba(13, 148, 136, 0.2);
  text-align: center;
}

.cta-box h3 {
  color: white;
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 16px 0;
  text-align: center !important;
  border-left: none !important;
  padding-left: 0 !important;
}

.cta-box p {
  color: rgba(255, 255, 255, 0.95);
  font-size: 18px;
  margin: 0 0 32px 0;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  text-align: center !important;
}

.cta-button {
  background: white;
  color: var(--color-brand-primary);
  padding: 16px 32px;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  font-size: 17px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-normal);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  background: #f0fdfa;
}

/* ==========================================================================
   BREADCRUMBS
   ========================================================================== */

.breadcrumb {
  margin: 24px 0;
  padding: 18px 24px;
  background: var(--color-bg-card);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  min-height: 56px;
}

.breadcrumb-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.4;
  width: 100%;
  align-items: center;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
  content: "›";
  margin: 0 10px;
  color: var(--color-text-muted);
}

.breadcrumb-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--color-brand-primary);
}

.breadcrumb-item.active {
  color: var(--color-text-primary);
  font-weight: 500;
}

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

footer {
  background-color: var(--color-bg-footer);
  padding: var(--space-section) 24px 32px;
  margin-top: var(--space-section);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.footer-links {
  display: flex;
  gap: 32px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-brand-primary);
}

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

/* ==========================================================================
   PAGE CONTENT
   ========================================================================== */

.page-content {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--color-bg-card);
  border-radius: var(--border-radius);
  padding: 48px;
  border: 1px solid var(--color-border);
}

.page-content h1,
.page-content h2,
.page-content h3,
.page-content p,
.page-content ul,
.page-content ol {
  text-align: left !important;
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 1024px) {
  .section-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-h1: 32px;
    --line-height-h1: 40px;
    --font-size-h2: 24px;
    --line-height-h2: 32px;
    --font-size-body: 16px;
    --space-section: 48px;
  }

  .header-content {
    padding: 0 16px;
  }

  .hero {
    padding: 48px 16px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero p {
    font-size: 18px;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  h2 {
    padding-left: 12px;
  }

  .section-grid,
  .section-grid-small {
    grid-template-columns: 1fr;
  }

  .main-nav ul {
    gap: 16px;
  }

  .page-content {
    padding: 32px 24px;
  }

  main {
    padding: 0 16px var(--space-section);
  }
}

@media (max-width: 640px) {
  .section-card {
    padding: 24px 20px;
  }

  .breadcrumb {
    padding: 15px 16px;
  }

  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */

a:focus,
button:focus,
input:focus {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   UTILITIES
   ========================================================================== */

.text-center {
  text-align: center !important;
}

.full-width {
  width: 100%;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}