/* ============================================================
   VARIABLES.CSS — Design tokens globali
   Sistema Cardano Day · ITIS G. Cardano, Pavia
   ============================================================ */

:root {
  /* Colori principali */
  --color-primary:        #E8500A;   /* Arancione ITIS */
  --color-primary-dark:   #C44008;
  --color-primary-light:  #FF6B2B;
  --color-primary-bg:     #FFF3ED;

  /* Dark UI (navbar, footer, hero) */
  --color-dark:           #1A1A1A;
  --color-dark-2:         #2A2A2A;
  --color-dark-3:         #3A3A3A;

  /* Testi */
  --color-text:           #1A1A1A;
  --color-text-secondary: #555555;
  --color-text-muted:     #888888;
  --color-text-on-dark:   #FFFFFF;
  --color-text-on-dark-2: rgba(255,255,255,0.7);

  /* Sfondi */
  --color-bg:             #F5F5F5;
  --color-bg-white:       #FFFFFF;
  --color-bg-card:        #FFFFFF;
  --color-border:         #E0E0E0;
  --color-border-light:   #EEEEEE;

  /* Stato */
  --color-success:        #16A34A;
  --color-success-bg:     #DCFCE7;
  --color-warning:        #D97706;
  --color-warning-bg:     #FEF3C7;
  --color-danger:         #DC2626;
  --color-danger-bg:      #FEE2E2;
  --color-info:           #2563EB;
  --color-info-bg:        #DBEAFE;

  /* Badge laboratori */
  --color-lab-informatica:  #3B82F6;
  --color-lab-elettronica:  #F59E0B;
  --color-lab-meccanica:    #6B7280;
  --color-lab-chimica:      #8B5CF6;
  --color-lab-liceo:        #10B981;

  /* Tipografia */
  --font-sans:   'DM Sans', 'Segoe UI', sans-serif;
  --font-display:'DM Sans', 'Segoe UI', sans-serif;
  --font-mono:   'JetBrains Mono', 'Courier New', monospace;

  /* Pesi */
  --fw-regular: 400;
  --fw-medium:  500;
  --fw-semibold:600;
  --fw-bold:    700;
  --fw-black:   900;

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

  /* Spaziature */
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-5:   1.25rem;
  --space-6:   1.5rem;
  --space-8:   2rem;
  --space-10:  2.5rem;
  --space-12:  3rem;
  --space-16:  4rem;
  --space-20:  5rem;
  --space-24:  6rem;

  /* Border radius */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-2xl: 24px;
  --radius-full:9999px;

  /* Ombre */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg:  0 8px 24px rgba(0,0,0,0.12);
  --shadow-xl:  0 16px 40px rgba(0,0,0,0.15);

  /* Transizioni */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  /* Layout */
  --container-max:  1200px;
  --container-pad:  var(--space-6);
  --navbar-height:  64px;
}

/* ============================================================
   RESET BASE
   ============================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--fw-regular);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

.text-primary   { color: var(--color-primary); }
.text-muted     { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.fw-bold        { font-weight: var(--fw-bold); }
.fw-semibold    { font-weight: var(--fw-semibold); }

/* ============================================================
   BOTTONI GLOBALI
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.02em;
  transition: background var(--transition-fast),
              transform  var(--transition-fast),
              box-shadow var(--transition-fast);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn:hover   { transform: translateY(-1px); }
.btn:active  { transform: translateY(0); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 12px rgba(232,80,10,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary-bg);
}

.btn-dark {
  background: var(--color-dark);
  color: #fff;
}
.btn-dark:hover {
  background: var(--color-dark-2);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* Badge stato */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.03em;
}

.badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.badge-open {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge-soon {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-closed {
  background: var(--color-border-light);
  color: var(--color-text-muted);
}