/**
 * Aitech.it Design System
 * Version: 2.1.0
 * Created: 23 Feb 2026
 * Updated: 23 Feb 2026 - Palette A Applied
 * Branch: restyling
 *
 * Modern design system with Ciano Sofisticato palette (Option A) + Inter typography
 * Palette: Rich Cyan + Warm Orange accents for professional warmth
 */

/* ==================================================
   IMPORTS
   ================================================== */

/* Inter Font from Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* JetBrains Mono for code/technical content (optional) */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&display=swap');


/* ==================================================
   CSS CUSTOM PROPERTIES (Variables)
   ================================================== */

:root {
  /* ============================================
     COLOR PALETTE - Opzione A: Ciano Sofisticato
     ============================================ */

  /* Primary Colors - Rich Cyan */
  --color-primary-900: #0a5a6e;  /* Ciano scuro profondo */
  --color-primary-800: #156f88;
  --color-primary-700: #1a8ba3;  /* Ciano medio */
  --color-primary-600: #29acd1;
  --color-primary-500: #3ecdff;  /* Ciano vibrante - Main brand color */
  --color-primary-400: #56d3ff;
  --color-primary-300: #6ed9ff;  /* Ciano chiaro */
  --color-primary-200: #a0e7ff;
  --color-primary-100: #e6f9ff;  /* Ciano ultra light */
  --color-primary-50: #f2fcff;

  /* Secondary Colors - Slate Modern */
  --color-secondary-900: #0f172a;  /* Navy profondissimo */
  --color-secondary-800: #1e293b;  /* Navy scuro */
  --color-secondary-700: #334155;  /* Slate dark */
  --color-secondary-600: #475569;
  --color-secondary-500: #64748b;  /* Slate medium */
  --color-secondary-400: #94a3b8;
  --color-secondary-300: #cbd5e1;  /* Slate light */
  --color-secondary-200: #e2e8f0;
  --color-secondary-100: #f1f5f9;  /* Background */
  --color-secondary-50: #f8fafc;

  /* Accent Colors - Warm Orange */
  --color-accent-900: #7c2d12;  /* Orange scurissimo */
  --color-accent-800: #9a3412;
  --color-accent-700: #c2410c;  /* Orange molto scuro */
  --color-accent-600: #ea580c;  /* Orange scuro */
  --color-accent-500: #fb923c;  /* Orange vibrante - Main accent */
  --color-accent-400: #fdba74;  /* Orange medio */
  --color-accent-300: #fed7aa;  /* Orange chiaro */
  --color-accent-200: #fee2c8;
  --color-accent-100: #ffedd5;
  --color-accent-50: #fff7ed;

  /* Semantic Colors */
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-success-dark: #065f46;

  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-warning-dark: #92400e;

  --color-error: #ef4444;
  --color-error-light: #fee2e2;
  --color-error-dark: #991b1b;

  --color-info: #3b82f6;
  --color-info-light: #dbeafe;
  --color-info-dark: #1e3a8a;

  /* Neutral Colors */
  --color-white: #ffffff;
  --color-black: #000000;

  /* Text Colors */
  --color-text-primary: var(--color-secondary-900);
  --color-text-secondary: var(--color-secondary-700);
  --color-text-tertiary: var(--color-secondary-500);
  --color-text-disabled: var(--color-secondary-400);
  --color-text-inverse: var(--color-white);

  /* Background Colors */
  --color-bg-primary: var(--color-white);
  --color-bg-secondary: var(--color-secondary-50);
  --color-bg-tertiary: var(--color-secondary-100);
  --color-bg-elevated: var(--color-white);

  /* Border Colors */
  --color-border-primary: var(--color-secondary-300);
  --color-border-secondary: var(--color-secondary-200);
  --color-border-focus: var(--color-primary-500);


  /* ============================================
     TYPOGRAPHY
     ============================================ */

  /* Font Families */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;

  /* Font Sizes - Type Scale (8pt baseline) */
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 1.875rem;   /* 30px */
  --font-size-4xl: 2.25rem;    /* 36px */
  --font-size-5xl: 3rem;       /* 48px */
  --font-size-6xl: 3.75rem;    /* 60px */
  --font-size-7xl: 4.5rem;     /* 72px */

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;

  /* Line Heights */
  --line-height-none: 1;
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* Letter Spacing */
  --letter-spacing-tighter: -0.05em;
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;


  /* ============================================
     SPACING SYSTEM (8pt baseline)
     ============================================ */

  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  --spacing-32: 8rem;     /* 128px */
  --spacing-40: 10rem;    /* 160px */
  --spacing-48: 12rem;    /* 192px */
  --spacing-56: 14rem;    /* 224px */
  --spacing-64: 16rem;    /* 256px */


  /* ============================================
     SIZING
     ============================================ */

  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* Max Content Width (optimal reading) */
  --max-content-width: 1280px;


  /* ============================================
     BORDER RADIUS
     ============================================ */

  --radius-none: 0;
  --radius-sm: 0.25rem;    /* 4px */
  --radius-base: 0.5rem;   /* 8px */
  --radius-md: 0.75rem;    /* 12px */
  --radius-lg: 1rem;       /* 16px */
  --radius-xl: 1.5rem;     /* 24px */
  --radius-2xl: 2rem;      /* 32px */
  --radius-full: 9999px;   /* Circular */


  /* ============================================
     SHADOWS
     ============================================ */

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-2xl: 0 35px 60px -15px rgba(0, 0, 0, 0.3);

  /* Colored Shadows (for buttons/cards) */
  --shadow-primary: 0 10px 25px -5px rgba(62, 205, 255, 0.3);
  --shadow-accent: 0 10px 25px -5px rgba(16, 185, 129, 0.3);


  /* ============================================
     Z-INDEX LAYERS
     ============================================ */

  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;


  /* ============================================
     TRANSITIONS
     ============================================ */

  /* Duration */
  --duration-instant: 75ms;
  --duration-fast: 150ms;
  --duration-base: 200ms;
  --duration-moderate: 300ms;
  --duration-slow: 500ms;

  /* Easing Functions */
  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);

  /* Combined Transitions */
  --transition-fast: all var(--duration-fast) var(--ease-out);
  --transition-base: all var(--duration-base) var(--ease-out);
  --transition-moderate: all var(--duration-moderate) var(--ease-out);


  /* ============================================
     BREAKPOINTS (for JS/media queries)
     ============================================ */

  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}


/* ==================================================
   DARK MODE COLORS (Optional)
   ================================================== */

@media (prefers-color-scheme: dark) {
  :root {
    /* Override colors for dark mode */
    --color-bg-primary: var(--color-secondary-900);
    --color-bg-secondary: var(--color-secondary-800);
    --color-bg-tertiary: var(--color-secondary-700);
    --color-bg-elevated: var(--color-secondary-800);

    --color-text-primary: var(--color-secondary-50);
    --color-text-secondary: var(--color-secondary-200);
    --color-text-tertiary: var(--color-secondary-400);
    --color-text-disabled: var(--color-secondary-600);

    --color-border-primary: var(--color-secondary-700);
    --color-border-secondary: var(--color-secondary-800);

    /* Adjust shadows for dark mode */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  }
}


/* ==================================================
   BASE STYLES
   ================================================== */

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

/* Better font rendering for Inter */
body {
  font-feature-settings: 'liga' 1, 'calt' 1; /* Enable ligatures and contextual alternates */
}


/* ==================================================
   TYPOGRAPHY UTILITIES
   ================================================== */

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: var(--letter-spacing-tight);
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-tight);
}

h3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
}

h4 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

h5 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

h6 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

p {
  margin: 0 0 var(--spacing-4) 0;
  line-height: var(--line-height-relaxed);
}

a {
  color: var(--color-primary-500);  /* Ciano - Brand identity */
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  color: var(--color-accent-600);  /* Orange - Energy & action */
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

strong, b {
  font-weight: var(--font-weight-semibold);
}

em, i {
  font-style: italic;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.125rem 0.375rem;
  background-color: var(--color-secondary-100);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  padding: var(--spacing-4);
  background-color: var(--color-secondary-900);
  color: var(--color-secondary-50);
  border-radius: var(--radius-base);
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}


/* ==================================================
   UTILITY CLASSES
   ================================================== */

/* Container */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-4);
  padding-right: var(--spacing-4);
}

@media (min-width: 640px) {
  .container {
    max-width: var(--container-sm);
    padding-left: var(--spacing-6);
    padding-right: var(--spacing-6);
  }
}

@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

@media (min-width: 1536px) {
  .container {
    max-width: var(--container-2xl);
  }
}

/* Text Utilities */
.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-brand { color: var(--color-primary-500); }
.text-accent { color: var(--color-accent-500); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }

/* Font Weight Utilities */
.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }
.font-extrabold { font-weight: var(--font-weight-extrabold); }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Display */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

/* Flexbox Utilities */
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.flex-wrap { flex-wrap: wrap; }
.gap-2 { gap: var(--spacing-2); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }

/* Spacing Utilities (sample - extend as needed) */
.m-0 { margin: 0; }
.mt-4 { margin-top: var(--spacing-4); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mt-8 { margin-top: var(--spacing-8); }
.mb-8 { margin-bottom: var(--spacing-8); }
.mt-16 { margin-top: var(--spacing-16); }
.mb-16 { margin-bottom: var(--spacing-16); }

.p-4 { padding: var(--spacing-4); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }
.py-4 { padding-top: var(--spacing-4); padding-bottom: var(--spacing-4); }
.py-8 { padding-top: var(--spacing-8); padding-bottom: var(--spacing-8); }
.py-16 { padding-top: var(--spacing-16); padding-bottom: var(--spacing-16); }

/* Background Colors */
.bg-primary { background-color: var(--color-bg-primary); }
.bg-secondary { background-color: var(--color-bg-secondary); }
.bg-brand { background-color: var(--color-primary-500); }
.bg-accent { background-color: var(--color-accent-500); }

/* Borders */
.border { border: 1px solid var(--color-border-primary); }
.border-t { border-top: 1px solid var(--color-border-primary); }
.border-b { border-bottom: 1px solid var(--color-border-primary); }

/* Border Radius */
.rounded { border-radius: var(--radius-base); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadow Utilities */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-base); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Transitions */
.transition { transition: var(--transition-base); }
.transition-fast { transition: var(--transition-fast); }


/* ==================================================
   COMPONENT CLASSES (Base/Examples)
   ================================================== */

/* Buttons - will be expanded in separate components file */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  border-radius: var(--radius-base);
  border: none;
  cursor: pointer;
  transition: var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-primary-500);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent-600);  /* Orange scuro */
  border: 2px solid var(--color-accent-500);  /* Orange vibrante */
  box-shadow: none;
}

.btn-secondary:hover {
  background-color: var(--color-accent-500);  /* Orange fill */
  border-color: var(--color-accent-500);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(251, 146, 60, 0.3);  /* Orange glow */
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Cards */
.card {
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

.card:hover {
  border-color: var(--color-border-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}


/* ==================================================
   RESPONSIVE UTILITIES
   ================================================== */

/* Hide/Show at breakpoints */
@media (max-width: 767px) {
  .hidden-mobile { display: none; }
}

@media (min-width: 768px) {
  .hidden-desktop { display: none; }
}


/* ==================================================
   ACCESSIBILITY
   ================================================== */

/* Focus visible (keyboard navigation) */
*:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}


/* ==================================================
   END DESIGN SYSTEM
   ================================================== */