/* Custom styles and CSS variables for light/dark themes */

:root {
  /* Light theme (default) */
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-primary: #1d4ed8;
  --color-primary-dark: #1e40af;
  --color-primary-light: #3b82f6;
  --color-border: #e2e8f0;
  --color-cta-bg: #1d4ed8;
  --color-cta-text: #ffffff;
  --shadow-sm: 0 1px 2px 0 rgb(15 23 42 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(15 23 42 / 0.1), 0 2px 4px -2px rgb(15 23 42 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(15 23 42 / 0.1), 0 4px 6px -4px rgb(15 23 42 / 0.1);
}

[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-surface: #1e293b;
  --color-text: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-primary: #60a5fa;
  --color-primary-dark: #3b82f6;
  --color-primary-light: #93c5fd;
  --color-border: #334155;
  --color-cta-bg: #2563eb;
  --color-cta-text: #ffffff;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);
}

/* Base theme application */
body {
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.bg-theme {
  background-color: var(--color-bg);
}

.bg-theme-alt {
  background-color: var(--color-bg-alt);
}

.bg-theme-surface {
  background-color: var(--color-surface);
}

.text-theme {
  color: var(--color-text);
}

.text-theme-muted {
  color: var(--color-text-muted);
}

.border-theme {
  border-color: var(--color-border);
}

/* Hero photo styling */
.hero-photo {
  object-fit: cover;
  object-position: center 30%;
  aspect-ratio: 4 / 5;
  width: 100%;
  max-width: 380px;
  border-radius: 2rem;
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-photo:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px -5px rgb(15 23 42 / 0.15), 0 8px 10px -6px rgb(15 23 42 / 0.1);
}

[data-theme="dark"] .hero-photo:hover {
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.6), 0 8px 10px -6px rgb(0 0 0 / 0.6);
}

/* Section card styling */
.theme-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease, border-color 0.3s ease;
}

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

/* Tag / pill styling */
.theme-tag {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

/* Primary buttons */
.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

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

/* Secondary buttons */
.btn-secondary {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* CTA section */
.cta-section {
  background-color: var(--color-primary);
  color: white;
}

[data-theme="dark"] .cta-section {
  background-color: var(--color-primary-dark);
}

/* Smooth scroll */
html {
  scroll-behavior: smooth;
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* FAQ accordion */
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  opacity: 0;
}

.faq-item.open .faq-answer {
  max-height: 500px;
  opacity: 1;
}

.faq-icon {
  transition: transform 0.3s ease;
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

/* Theme toggle button */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 9999px;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover {
  background-color: var(--color-bg-alt);
}

/* Header glass effect */
.header-glass {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
}

[data-theme="dark"] .header-glass {
  background-color: rgba(15, 23, 42, 0.9);
}

/* Mobile menu */
.mobile-menu {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

/* Link hover */
.nav-link {
  color: var(--color-text-muted);
}

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

/* Publication links */
.publication-link {
  color: var(--color-primary);
}

.publication-link:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Disclaimer box */
.disclaimer {
  background-color: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
}

/* Selection color */
::selection {
  background-color: var(--color-primary);
  color: white;
}