/* FocusFund - Main Styles */
/* Design System: Calm night sky theme with deep blues and subtle accents */

:root {
  /* Core Colors - Deep Night Sky Palette */
  --color-bg-dark: hsl(222, 47%, 8%);
  --color-bg-medium: hsl(222, 40%, 12%);
  --color-bg-light: hsl(222, 35%, 16%);
  --color-bg-card: hsl(222, 38%, 14%);
  --color-bg-card-hover: hsl(222, 38%, 18%);
  
  /* Text Colors */
  --color-text-primary: hsl(210, 40%, 96%);
  --color-text-secondary: hsl(215, 20%, 70%);
  --color-text-muted: hsl(215, 15%, 50%);
  
  /* Accent Colors */
  --color-accent-primary: hsl(210, 60%, 55%);
  --color-accent-primary-hover: hsl(210, 60%, 65%);
  --color-accent-secondary: hsl(250, 50%, 60%);
  --color-accent-glow: hsla(210, 80%, 60%, 0.3);
  
  /* Status Colors */
  --color-success: hsl(150, 50%, 45%);
  --color-warning: hsl(40, 80%, 55%);
  --color-error: hsl(0, 60%, 55%);
  
  /* Star Colors */
  --color-star: hsl(45, 100%, 90%);
  --color-star-glow: hsla(45, 100%, 90%, 0.5);
  
  /* Rain Color */
  --color-rain: hsla(200, 60%, 70%, 0.3);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  --gradient-card: linear-gradient(180deg, var(--color-bg-card), var(--color-bg-medium));
  --gradient-hero: linear-gradient(135deg, hsl(210, 60%, 55%), hsl(280, 50%, 55%));
  
  /* Shadows */
  --shadow-soft: 0 4px 20px hsla(0, 0%, 0%, 0.3);
  --shadow-glow: 0 0 30px var(--color-accent-glow);
  --shadow-card: 0 8px 32px hsla(0, 0%, 0%, 0.4);
  
  /* Borders */
  --border-subtle: 1px solid hsla(215, 30%, 40%, 0.2);
  --border-card: 1px solid hsla(215, 30%, 50%, 0.15);
  
  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', var(--font-primary);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-dark);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Effects Container */
.background-effects {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* Navigation */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-xl);
  background: hsla(222, 47%, 8%, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: var(--border-subtle);
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.brand-icon {
  color: var(--color-accent-primary);
  font-size: 1.5rem;
  animation: twinkle 3s ease-in-out infinite;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-primary);
  background: hsla(210, 60%, 55%, 0.1);
}

.nav-cta {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* Pages */
.page {
  display: none;
  min-height: 100vh;
  padding-top: 70px;
  position: relative;
  z-index: 1;
}

.page.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-2xl);
}

.page-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.page-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-base);
  font-family: var(--font-primary);
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: var(--border-subtle);
}

.btn-ghost:hover {
  color: var(--color-text-primary);
  background: hsla(210, 60%, 55%, 0.1);
  border-color: var(--color-accent-primary);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
}

/* Back Button */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-secondary);
  background: none;
  border: none;
  font-size: 0.9rem;
  cursor: pointer;
  margin-bottom: var(--spacing-lg);
  transition: var(--transition-fast);
}

.back-btn svg {
  width: 18px;
  height: 18px;
}

.back-btn:hover {
  color: var(--color-text-primary);
}

/* Input */
.input {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-light);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-family: var(--font-primary);
  transition: var(--transition-fast);
}

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

.input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

/* Audio Controls */
.audio-controls {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--color-bg-card);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-full);
  border: var(--border-card);
  z-index: 100;
}

.audio-btn {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.audio-btn:hover {
  color: var(--color-text-primary);
  background: hsla(210, 60%, 55%, 0.1);
}

.audio-icon {
  width: 20px;
  height: 20px;
}

.audio-icon.hidden {
  display: none;
}

.volume-slider {
  width: 80px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-bg-light);
  border-radius: var(--radius-full);
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--color-accent-primary);
  border-radius: var(--radius-full);
  cursor: pointer;
}

/* Section Titles */
.section-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: hsla(0, 0%, 0%, 0.7);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--color-bg-card);
  border: var(--border-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition-fast);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
}

.modal-close:hover {
  color: var(--color-text-primary);
  background: hsla(210, 60%, 55%, 0.1);
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.text-gradient {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Responsive */
@media (max-width: 768px) {
  .main-nav {
    padding: 0 var(--spacing-md);
  }
  
  .nav-links {
    display: none;
  }
  
  .page-container {
    padding: var(--spacing-lg);
  }
  
  .page-title {
    font-size: 2rem;
  }
}