/*
 * Glassmorphism Design System
 * Apple-inspired liquid glass design language
 */

:root {
  /* Glass effect colors */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-bg-hover: rgba(255, 255, 255, 0.12);
  --glass-bg-active: rgba(255, 255, 255, 0.16);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-shadow: rgba(0, 0, 0, 0.1);
  --glass-shadow-lg: rgba(0, 0, 0, 0.15);

  /* Backdrop blur values */
  --blur-light: blur(10px);
  --blur-medium: blur(20px);
  --blur-heavy: blur(40px);

  /* Background gradient (professional, muted) */
  --bg-gradient: linear-gradient(
    160deg,
    #12152b 0%,
    #222a4a 40%,
    #162e4a 100%
  );

  /* Text colors with transparency for glass effect */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.95);
  --text-tertiary: rgba(255, 255, 255, 0.85);
  --text-disabled: rgba(255, 255, 255, 0.6);

  /* Accent colors */
  --accent-primary: #5b8db8;
  --accent-secondary: #4a7a9b;
  --accent-tertiary: #7baed4;
  --accent-success: #4ade80;
  --accent-warning: #fbbf24;
  --accent-error: #f87171;

  /* Spacing scale */
  --spacing-xs: 0.5rem;    /* 8px */
  --spacing-sm: 1rem;      /* 16px */
  --spacing-md: 1.5rem;    /* 24px */
  --spacing-lg: 2rem;      /* 32px */
  --spacing-xl: 3rem;      /* 48px */
  --spacing-2xl: 4rem;     /* 64px */
  --spacing-3xl: 6rem;     /* 96px */

  /* Border radius scale */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* Typography scale */
  --font-xs: 0.75rem;      /* 12px */
  --font-sm: 0.875rem;     /* 14px */
  --font-base: 1rem;       /* 16px */
  --font-lg: 1.125rem;     /* 18px */
  --font-xl: 1.25rem;      /* 20px */
  --font-2xl: 1.5rem;      /* 24px */
  --font-3xl: 1.875rem;    /* 30px */
  --font-4xl: 2.25rem;     /* 36px */
  --font-5xl: 3rem;        /* 48px */

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-tooltip: 600;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--bg-gradient);
  background-size: cover;
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Glass card component */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-medium);
  -webkit-backdrop-filter: var(--blur-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px var(--glass-shadow);
  transition: all var(--transition-base);
}

.glass-card:hover {
  background: var(--glass-bg-hover);
  box-shadow: 0 10px 40px var(--glass-shadow-lg);
}

.glass-card.active {
  background: var(--glass-bg-active);
  border-color: var(--accent-primary);
}

/* Glass card variants */
.glass-card-sm {
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
}

.glass-card-md {
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
}

.glass-card-lg {
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
}

/* Navigation glass effect */
.glass-nav {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-light);
  -webkit-backdrop-filter: var(--blur-light);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

/* Button glass effect */
.glass-button {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-light);
  -webkit-backdrop-filter: var(--blur-light);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-size: var(--font-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  outline: none;
  white-space: nowrap;
}

.glass-button:hover {
  background: var(--glass-bg-hover);
  box-shadow: 0 4px 16px var(--glass-shadow);
}

.glass-button:active {
  transform: scale(0.98);
  background: var(--glass-bg-active);
}

.glass-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Button variants */
.glass-button-primary {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.glass-button-primary:hover {
  background: var(--accent-secondary);
  border-color: var(--accent-secondary);
}

.glass-button-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-sm);
}

.glass-button-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-lg);
}

/* Input glass effect */
.glass-input {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-light);
  -webkit-backdrop-filter: var(--blur-light);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-size: var(--font-base);
  font-family: inherit;
  outline: none;
  width: 100%;
  transition: all var(--transition-base);
}

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

.glass-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(91, 141, 184, 0.2);
  background: var(--glass-bg-hover);
}

.glass-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Textarea variant */
.glass-textarea {
  min-height: 120px;
  resize: vertical;
  font-family: inherit;
}

/* Select variant */
.glass-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='rgba(255,255,255,0.7)' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-sm) center;
  padding-right: var(--spacing-xl);
}

/* Modal/Panel glass effect */
.glass-modal {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-heavy);
  -webkit-backdrop-filter: var(--blur-heavy);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 60px var(--glass-shadow-lg);
  padding: var(--spacing-lg);
}

/* Overlay for modals */
.glass-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Text gradient effect (Apple style) */
.text-gradient {
  background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gradient-accent {
  background: linear-gradient(135deg, var(--accent-tertiary) 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Loading spinner with glass effect */
.glass-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--accent-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Badge/Pill component */
.glass-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--glass-bg);
  backdrop-filter: var(--blur-light);
  -webkit-backdrop-filter: var(--blur-light);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

/* Divider */
.glass-divider {
  height: 1px;
  background: var(--glass-border);
  margin: var(--spacing-md) 0;
}

/* Utility classes */
.glass-surface {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-medium);
  -webkit-backdrop-filter: var(--blur-medium);
}

.glass-border {
  border: 1px solid var(--glass-border);
}

.glass-shadow {
  box-shadow: 0 8px 32px var(--glass-shadow);
}

.glass-shadow-lg {
  box-shadow: 0 20px 60px var(--glass-shadow-lg);
}

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

/* Focus visible for accessibility */
*:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

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

::-moz-selection {
  background: var(--accent-primary);
  color: white;
}

/* Scrollbar styling (webkit browsers) */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--glass-bg);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
  background: var(--glass-border);
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--glass-bg-hover);
  background-clip: padding-box;
}