:root {
  --primary-color: #005bea;
  --primary-color-dark: #004bbd;
  --primary-color-light: #e6f0ff;
  --accent-color-light-gradient-end: #33a1ff;
  --text-color-light: #ffffff;
  --text-color-primary: #222222;
  --text-color-secondary: #555555;
  --text-color-subtle: #6c757d;
  --yt-red-color: #FF0000;
  --btc-color: #f7931a;
  --eth-color: #627eea;
  --usdt-color: #26a17b;
  --mp3-text-color: #c0392b;
  --mp4-text-color: #2980b9;
  --background-color-page: #f4f6f8;
  --background-color-card: #ffffff;
  --background-color-input-group: #eef5ff;
  --background-color-footer: #0f172a;
  --background-color-footer-border: #1e293b;
  --background-color-toast: rgba(15, 23, 42, 0.9);
  --header-bg-gradient: linear-gradient(90deg, var(--primary-color), var(--accent-color-light-gradient-end));
  --border-color-soft: #dee2e6;
  --border-color-input: #ced4da;
  --card-shadow: 0 6px 18px rgba(0, 0, 0, 0.07);
  --card-shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.1);
  --header-shadow-color: rgba(0,0,0,0.1);
  --font-family-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-monospace: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --base-font-size: 16px;
  --line-height-base: 1.6;
  --border-radius-sm: 6px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --container-max-width: 1140px;
  --section-padding-y: 1.25rem;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: var(--base-font-size); scroll-padding-top: 80px; }
body {
  font-family: var(--font-family-main);
  line-height: var(--line-height-base);
  color: var(--text-color-primary);
  background-color: var(--background-color-page);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
h1, h2, h3, h4, h5, h6 { margin-bottom: 0.75rem; font-weight: 600; line-height: 1.3; }
h1 { font-size: 2.25rem; }
h2 { font-size: 1.85rem; }
h3 { font-size: 1.25rem; }
p { margin-bottom: 1rem; }
a { color: var(--primary-color); text-decoration: none; transition: color 0.2s ease-in-out; }
a:hover { color: var(--primary-color-dark); text-decoration: underline; }
img, svg { max-width: 100%; height: auto; vertical-align: middle; }
input, button, select, textarea {
  font-family: inherit; font-size: inherit; line-height: inherit;
  border-radius: var(--border-radius-sm);
}
button { cursor: pointer; }
.container {
  width: 100%; max-width: var(--container-max-width);
  margin-left: auto; margin-right: auto;
  padding-left: 1.5rem; padding-right: 1.5rem;
}
.page-section {
  padding-top: var(--section-padding-y);
  padding-bottom: var(--section-padding-y);
  text-align: center;
}
.section-title {
  font-size: 1.85rem;
  color: var(--primary-color);
  margin: 0 auto 1.25rem;
  display: inline-block;
  position: relative; padding-bottom: 0.5rem; font-weight: 700;
}
.section-title::after {
  content: ''; position: absolute; bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px; background: var(--primary-color); border-radius: 2px;
}
.section-title i { margin-right: 0.75rem; }
.section-subtitle {
  font-size: 1rem; color: var(--text-color-secondary);
  margin: 0 auto 1.75rem;
  max-width: 650px; line-height: 1.7;
}
.visually-hidden {
  position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important;
  overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; border: 0 !important;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem; font-size: 1rem; font-weight: 500; text-align: center;
  vertical-align: middle; cursor: pointer; border: 1px solid transparent;
  border-radius: var(--border-radius-md); transition: all 0.2s ease-in-out;
  text-decoration: none;
}
.btn i { line-height: 1; }
.btn-primary {
  color: var(--text-color-light); background-color: var(--primary-color);
  border-color: var(--primary-color);
}
.btn-primary:hover, .btn-primary:focus {
  background-color: var(--primary-color-dark); border-color: var(--primary-color-dark);
  color: var(--text-color-light); text-decoration: none;
}
.btn-outline {
  color: var(--primary-color); background-color: transparent;
  border-color: var(--primary-color);
}
.btn-outline:hover, .btn-outline:focus {
  color: var(--text-color-light); background-color: var(--primary-color);
  border-color: var(--primary-color); text-decoration: none;
}
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  margin-bottom: 1.5rem;
}
#site-header .header-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: var(--header-bg-gradient);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 2px 8px var(--header-shadow-color);
}
#site-header .logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  transition: opacity 0.2s ease;
}
#site-header .logo-link .logo-text-wrapper {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-color-light);
    margin: 0;
    text-transform: uppercase;
}
#site-header .logo-link:hover, #site-header .logo-link:focus {
  opacity: 0.85;
  outline: none;
  color: var(--text-color-light);
  text-decoration: none;
}
#backToTop {
  position: fixed; bottom: 1.5rem; right: 1.5rem; width: 3rem; height: 3rem;
  background-color: var(--primary-color); color: var(--text-color-light);
  border: none; border-radius: 50%; display: flex; align-items: center;
  justify-content: center; font-size: 1.2rem; cursor: pointer; opacity: 0;
  pointer-events: none; z-index: 999; box-shadow: 0 2px 10px rgba(0,0,0,0.2);
  transition: opacity 0.3s ease, background-color 0.2s ease, transform 0.2s ease;
}
#backToTop.show { opacity: 1; pointer-events: auto; }
#backToTop:hover, #backToTop:focus {
  background-color: var(--primary-color-dark); transform: translateY(-3px); outline: none;
}
#backToTop:active { transform: translateY(0); }
#main-content {
    flex-grow: 1;
}
#site-footer {
  padding: 0;
  margin-top: 2rem;
}
.footer-container {
  background: var(--background-color-footer);
  border-radius: var(--border-radius-lg);
  padding: 3.5rem 2.5rem;
  box-shadow: var(--card-shadow);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 3rem;
  margin-bottom: 2.5rem;
}
.footer-column {
  text-align: left;
}
.footer-heading {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-color-light);
  margin-bottom: 1.5rem;
}
.footer-about-text {
  color: #94a3b8;
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}
.social-heading {
  color: #94a3b8;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 1rem;
}
.footer-social-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--background-color-footer-border);
  color: #94a3b8;
  font-size: 1rem;
  transition: all 0.3s ease-in-out;
}
.social-link:hover {
  background-color: var(--primary-color);
  color: var(--text-color-light);
  transform: translateY(-3px);
}
.footer-link-list, .footer-contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.footer-column .footer-link {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
  display: inline-flex;
  align-items: center;
}
.footer-column .footer-link:hover {
  color: var(--text-color-light);
  padding-left: 5px;
  text-decoration: none;
}
.footer-contact-list .contact-icon {
  color: var(--primary-color);
  font-size: 1rem;
  margin-right: 0.85rem;
  width: 20px;
  text-align: center;
}
.footer-contact-list .fab.fa-whatsapp {
  color: #25d366;
}
.footer-hr {
  border: none;
  height: 1px;
  background-color: var(--background-color-footer-border);
  margin: 0;
}
.footer-bottom {
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.copyright-text, .designer-credit {
  font-size: 0.9rem;
  color: #94a3b8;
  margin: 0;
}
.designer-credit .footer-link-special {
  color: #fbbf24;
  font-weight: 500;
  text-decoration: none;
}
.designer-credit .footer-link-special:hover {
  color: #fde047;
}
@media (max-width: 768px) {
  .footer-grid {
    gap: 2.5rem;
  }
  .footer-column, .social-heading {
    text-align: center;
  }
  .footer-social-list {
    justify-content: center;
  }
  .footer-column .footer-link {
    justify-content: center;
  }
  .footer-bottom {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }
  .section-title { font-size: 1.6rem; margin-bottom: 1rem; }
  .section-subtitle { font-size: 0.95rem; margin-bottom: 1.5rem; }
}
@media (max-width: 576px) {
  .footer-container {
    padding: 2.5rem 1.5rem;
  }
  h2.section-title { font-size: 1.4rem; margin-bottom: 0.75rem; }
  .section-subtitle { font-size: 0.9rem; margin-bottom: 1.25rem; }
  .container { padding-left: 1rem; padding-right: 1rem; }
  #site-header { margin-bottom: 1rem; }
  #site-footer { margin-top: 1.5rem; }
  #site-header .logo-link .logo-text-wrapper { font-size: 1.4rem; }
  .copyright-text, .designer-credit, .footer-column .footer-link { font-size: 0.85rem; }
}