/* --- Google Font Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* --- CSS Variables --- */
:root {
  /* Light Theme */
  --bg-color-light: #f0f2f5;
  --glass-bg-light: rgba(255, 255, 255, 0.65);
  --text-primary-light: #1a202c;
  --text-secondary-light: #4a5568;
  --border-light: rgba(0, 0, 0, 0.1);
  --shadow-light: rgba(99, 99, 99, 0.2);
  --accent-primary: #4f46e5;
  --accent-secondary: #3b82f6;

  /* Dark Theme */
  --bg-color-dark: #0f172a;
  --glass-bg-dark: rgba(30, 41, 59, 0.7);
  --text-primary-dark: #f8fafc;
  --text-secondary-dark: #94a3b8;
  --border-dark: rgba(255, 255, 255, 0.15);
  --shadow-dark: rgba(0, 0, 0, 0.25);
  
  /* Shared */
  --radius: 16px;
  --transition: 0.3s ease;
  --max-width: 1320px;
}

body.dark-mode {
  --bg-color-light: var(--bg-color-dark);
  --glass-bg-light: var(--glass-bg-dark);
  --text-primary-light: var(--text-primary-dark);
  --text-secondary-light: var(--text-secondary-dark);
  --border-light: var(--border-dark);
  --shadow-light: var(--shadow-dark);
}

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

body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  background-color: var(--bg-color-light);
  color: var(--text-primary-light);
  background-image: radial-gradient(circle at top, color-mix(in srgb, var(--accent-secondary) 10%, transparent) 0%, var(--bg-color-light) 35%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- Header --- */
.main-header {
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg-light);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex; align-items: center; gap: 0.75rem;
  text-decoration: none; color: var(--text-primary-light);
}
.logo i { font-size: 1.5rem; color: var(--accent-primary); }
.logo h1 { font-size: 1.25rem; font-weight: 700; margin: 0; }
.main-nav { display: none; }
.theme-toggle-btn {
  background-color: transparent; border: 1px solid var(--border-light);
  color: var(--text-secondary-light); width: 40px; height: 40px;
  border-radius: 8px; cursor: pointer; display: flex; align-items: center;
  justify-content: center; font-size: 1.2rem; transition: var(--transition);
}
.theme-toggle-btn:hover {
  border-color: var(--accent-primary); color: var(--accent-primary);
}
#theme-icon-moon { display: none; }
body.dark-mode #theme-icon-sun { display: none; }
body.dark-mode #theme-icon-moon { display: block; }

/* --- Main Layout --- */
.page-wrapper {
  flex-grow: 1; width: 100%; max-width: var(--max-width);
  margin: 2rem auto; padding: 0 1.5rem; display: grid;
  grid-template-columns: 1fr; gap: 2rem;
  animation: slideInUp 0.6s ease-out;
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Main Content Area (Calculator) --- */
.main-content {
  background: var(--glass-bg-light);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: 0 8px 32px 0 var(--shadow-light);
}

/* --- Quick Nav & Ad Sidebars --- */
.left-sidebar, .right-sidebar {
  display: none; /* Hidden on mobile */
  position: sticky;
  top: 100px; /* Aligns with header */
}

/* --- Ad Slot Styling --- */
.ad-placeholder {
  background-color: color-mix(in srgb, var(--border-light) 50%, transparent);
  border: 1px dashed var(--border-light);
  border-radius: 12px;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-style: italic;
  color: var(--text-secondary-light);
  font-size: 0.9rem;
  padding: 1rem;
  text-align: center;
  width: 100%;
}
.ad-placeholder.side-ad { min-height: 400px; }
.ad-placeholder.top-ad { margin-bottom: 1.5rem; }
.ad-placeholder.bottom-ad { margin-top: 1.5rem; }

/* --- Quick Navigation (More Tools) --- */
.more-tools-nav {
  background: var(--glass-bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 1rem;
}
.more-tools-nav h3 {
  margin: 0 0 1rem 0; font-size: 1rem;
  font-weight: 600; color: var(--text-secondary-light);
  border-bottom: 1px solid var(--border-light); padding-bottom: 0.75rem;
}
.more-tools-nav ul { list-style: none; padding: 0; margin: 0; }
.more-tools-nav li a {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.6rem 0.5rem; border-radius: 8px;
  text-decoration: none; color: var(--text-secondary-light);
  font-weight: 500; font-size: 0.9rem; transition: var(--transition);
}
.more-tools-nav li a:hover {
  background-color: var(--accent-primary); color: white;
}
.more-tools-nav li a .fa-solid {
  width: 16px; text-align: center;
  color: var(--accent-secondary);
}
.more-tools-nav li a:hover .fa-solid { color: white; }

/* --- Forms & Results --- */
.form-box h2 { text-align: center; margin-top: 0; margin-bottom: 2rem; font-size: 1.75rem; }
.input-group { margin-bottom: 1.5rem; }
.input-group label { display: block; font-weight: 500; margin-bottom: 0.5rem; color: var(--text-secondary-light); font-size: 0.9rem; }
.input-group input, .input-group select {
  width: 100%; padding: 0.85rem 1rem; border-radius: 8px;
  border: 1px solid var(--border-light); background-color: var(--bg-color-light);
  color: var(--text-primary-light); font-family: 'Inter', sans-serif; font-size: 1rem;
  transition: var(--transition);
}
.input-group input:focus, .input-group select:focus {
  outline: none; border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-primary) 20%, transparent);
}
.calc-button {
  width: 100%; background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  color: white; border: none; font-weight: 600; font-size: 1rem; padding: 0.85rem;
  border-radius: 8px; cursor: pointer; transition: var(--transition); margin-top: 1rem;
}
.calc-button:hover { opacity: 0.9; box-shadow: 0 5px 15px color-mix(in srgb, var(--accent-primary) 30%, transparent); }
.button-group { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.result-box {
  margin-top: 2rem; background-color: var(--bg-color-light); border: 1px solid var(--border-light);
  border-left: 4px solid var(--accent-primary); padding: 1.5rem; border-radius: 12px;
  animation: fadeIn 0.5s ease;
}
.result-box p { margin: 0 0 0.75rem 0; color: var(--text-secondary-light); line-height: 1.6; }
.result-box p:last-child { margin-bottom: 0; }
.result-box strong, .result-box .highlight { color: var(--text-primary-light); font-weight: 600; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* --- Footer --- */
.main-footer {
  text-align: center; padding: 2rem 1.5rem; margin-top: auto;
  color: var(--text-secondary-light); font-size: 0.9rem;
}

/* --- Page Content Area (for About, SEO Text, etc.) --- */
.page-content-area {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
}
.page-content-area h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary-light);
}
.page-content-area h4 {
    font-size: 1.2rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary-light);
}
.page-content-area p, .page-content-area ul {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary-light);
    margin-bottom: 1rem;
}
.page-content-area li {
    margin-bottom: 0.5rem;
}
.page-content-area a {
    color: var(--accent-primary);
    font-weight: 500;
}

/* --- Footer Links & Logo --- */
.footer-links {
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}
.footer-links a {
    color: var(--text-secondary-light);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition);
}
.footer-links a:hover {
    color: var(--accent-primary);
    text-decoration: underline;
}
.copyright-line {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    color: var(--text-secondary-light);
    font-size: 0.9rem;
}
.copyright-line a.corevity-logo-link {
    display: inline-flex; 
    align-items: center;
}
/* Styles for the new inline SVG */
.corevity-logo-svg {
    height: 2rem; /* A good size to match text */
    width: auto;
    transition: var(--transition);
    opacity: 0.9;
}
.corevity-logo-svg:hover {
    opacity: 1;
}
/* The text inside the logo will use the primary text color */
.corevity-logo-svg .logo-text {
    fill: var(--text-primary-light); /* Black in light mode, white in dark */
    transition: fill var(--transition);
}

/* --- Responsive Design --- */
@media (min-width: 768px) {
  .main-content { padding: 2rem; }
  .main-nav { display: flex; gap: 1.5rem; }
  .main-nav a { text-decoration: none; color: var(--text-secondary-light); font-weight: 500; transition: color var(--transition); }
  .main-nav a:hover { color: var(--accent-primary); }
}
@media (min-width: 1024px) {
  .page-wrapper { grid-template-columns: 240px 1fr; gap: 2rem; }
  .left-sidebar { display: block; }
}
@media (min-width: 1280px) {
  .page-wrapper { grid-template-columns: 240px 1fr 240px; }
  .right-sidebar { display: block; }
}