/* ==========================================================================
   Helico-Presto — Base Styles
   Design system tokens, reset, typography
   ========================================================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:ital,opsz,wght@0,6..12,400;0,6..12,600;0,6..12,700;1,6..12,400&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  /* Colors — Brand */
  --color-primary: #FF385C;
  --color-primary-hover: #E00B41;
  --color-primary-light: rgba(255, 56, 92, 0.08);
  --color-error: #C13515;

  /* Colors — Aviation accents */
  --color-trust: #008A05;
  --color-info: #0077B6;
  --color-whatsapp: #25D366;

  /* Colors — Text */
  --color-text: #222222;
  --color-text-focus: #3F3F3F;
  --color-text-secondary: #6A6A6A;
  --color-text-tertiary: #919191;
  --color-text-disabled: rgba(0, 0, 0, 0.24);
  --color-text-inverse: #FFFFFF;

  /* Colors — Surface */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F7F7;
  --color-bg-light: #F2F2F2;
  --color-border: #DDDDDD;
  --color-border-focus: #222222;
  --color-footer: #222222;
  --color-card-bg: #FFFFFF;

  /* Shadows */
  --shadow-card: 0 0 0 1px rgba(0,0,0,0.02), 0 2px 6px rgba(0,0,0,0.04), 0 4px 8px rgba(0,0,0,0.1);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-elevated: 0 4px 6px rgba(0,0,0,0.08), 0 12px 32px rgba(0,0,0,0.12), 0 24px 60px rgba(0,0,0,0.08);
  --shadow-sticky: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-btn-primary: 0 2px 8px rgba(255, 56, 92, 0.3);

  /* Typography */
  --font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  --font-size-display: 3.5rem;    /* 56px */
  --font-size-h1: 2.625rem;       /* 42px */
  --font-size-h2: 1.875rem;       /* 30px */
  --font-size-h3: 1.5rem;         /* 24px */
  --font-size-h4: 1.25rem;        /* 20px */
  --font-size-body-lg: 1.125rem;  /* 18px */
  --font-size-ui: 1rem;           /* 16px */
  --font-size-body: 0.875rem;     /* 14px */
  --font-size-small: 0.8125rem;   /* 13px */
  --font-size-tag: 0.75rem;       /* 12px */
  --font-size-micro: 0.6875rem;   /* 11px */

  /* Spacing (8px base) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;
  --space-5xl: 96px;
  --space-6xl: 120px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-input: 12px;
  --radius-card: 20px;
  --radius-lg: 32px;
  --radius-circle: 50%;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Z-index */
  --z-base: 1;
  --z-sticky: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-whatsapp: 400;
  --z-promo: 500;
}

/* ---------- Reset ---------- */
*,
*::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-family);
  font-size: var(--font-size-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

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

ul, ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

table {
  border-collapse: collapse;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-h1);
  letter-spacing: -0.44px;
}

h2 {
  font-size: var(--font-size-h2);
  letter-spacing: -0.3px;
}

h3 {
  font-size: var(--font-size-h3);
  font-weight: 600;
  letter-spacing: -0.2px;
}

h4 {
  font-size: var(--font-size-h4);
  font-weight: 600;
  letter-spacing: -0.18px;
}

p {
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

p:last-child {
  margin-bottom: 0;
}

.text-display {
  font-size: var(--font-size-display);
  font-weight: 700;
  line-height: 1.10;
  letter-spacing: -0.5px;
}

.text-lead {
  font-size: var(--font-size-body-lg);
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.text-small {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
}

.text-tag {
  font-size: var(--font-size-tag);
  font-weight: 600;
  line-height: 1.33;
}

.text-micro {
  font-size: var(--font-size-micro);
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ---------- Links ---------- */
a:not([class]) {
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

a:not([class]):hover {
  color: var(--color-primary);
}

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

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

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !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: 0;
}

/* ==========================================================================
   Dark Mode — follows system preference
   ========================================================================== */
@media (prefers-color-scheme: dark) {
  :root {
    /* Text */
    --color-text: #E8E8E8;
    --color-text-focus: #D0D0D0;
    --color-text-secondary: #A0A0A0;
    --color-text-tertiary: #787878;
    --color-text-disabled: rgba(255, 255, 255, 0.24);
    --color-text-inverse: #111111;

    /* Brand — slightly brighter for dark surfaces */
    --color-primary: #FF4D6D;
    --color-primary-hover: #FF6B85;
    --color-primary-light: rgba(255, 77, 109, 0.15);

    /* Aviation accents — brighter for dark */
    --color-trust: #2ECC40;
    --color-info: #29B6F6;

    /* Surfaces */
    --color-bg: #111111;
    --color-bg-alt: #1A1A1A;
    --color-bg-light: #252525;
    --color-card-bg: #1E1E1E;
    --color-border: #333333;
    --color-border-focus: #E8E8E8;
    --color-footer: #0A0A0A;

    /* Shadows — stronger on dark backgrounds */
    --shadow-card: 0 0 0 1px rgba(255,255,255,0.05), 0 2px 6px rgba(0,0,0,0.3), 0 4px 8px rgba(0,0,0,0.4);
    --shadow-hover: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-elevated: 0 4px 6px rgba(0,0,0,0.3), 0 12px 32px rgba(0,0,0,0.5), 0 24px 60px rgba(0,0,0,0.4);
    --shadow-sticky: 0 2px 8px rgba(0,0,0,0.4);
    --shadow-btn-primary: 0 2px 12px rgba(255, 77, 109, 0.4);
  }

  /* Body background */
  body {
    color-scheme: dark;
  }

  /* Cards use card-bg */
  .card,
  .pricing-card,
  .gift-form-card,
  .vol-program-step,
  .budget-card,
  .fleet-card {
    background: var(--color-card-bg);
  }

  /* Nav — transparent over hero, dark on scroll */
  .nav.scrolled {
    background: var(--color-bg);
  }

  /* Nav links on scroll — light text */
  .nav.scrolled .nav-links a {
    color: var(--color-text);
  }

  .nav.scrolled .nav-hamburger span {
    background: var(--color-text);
  }

  .nav.scrolled .lang-selector-toggle {
    color: var(--color-text);
    border-color: var(--color-border);
  }

  /* Mobile nav overlay */
  .nav-mobile {
    background: var(--color-bg);
  }

  .nav-mobile a {
    color: var(--color-text);
    border-bottom-color: var(--color-border);
  }

  /* Language dropdown */
  .lang-dropdown {
    background: var(--color-card-bg);
  }

  .lang-dropdown a {
    color: var(--color-text);
  }

  .lang-dropdown a:hover {
    background: var(--color-bg-light);
  }

  /* Footer — even darker */
  .footer {
    background: var(--color-footer);
  }

  .footer-bottom {
    border-top-color: rgba(255, 255, 255, 0.08);
  }

  /* Forms */
  .form-input,
  .form-select,
  .form-textarea {
    background: var(--color-bg-light);
    border-color: var(--color-border);
    color: var(--color-text);
  }

  .form-input:focus,
  .form-select:focus,
  .form-textarea:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 2px rgba(232, 232, 232, 0.1);
  }

  /* Badge */
  .badge {
    background: var(--color-bg-light);
    color: var(--color-text);
  }

  .badge-trust {
    background: rgba(46, 204, 64, 0.15);
    color: var(--color-trust);
  }

  .badge-primary {
    background: var(--color-primary-light);
    color: var(--color-primary);
  }

  /* Card badge */
  .card-badge {
    background: var(--color-bg-light);
  }

  /* Trust bar */
  .trust-bar {
    background: var(--color-bg-alt);
  }

  /* Accordion */
  .accordion-item {
    border-bottom-color: var(--color-border);
  }

  .accordion-trigger {
    color: var(--color-text);
  }

  /* Prorogation section */
  .prorogation-section {
    background: var(--color-bg-alt);
  }

  /* Fleet feature tags */
  .fleet-feature-tag {
    background: var(--color-primary-light);
    color: var(--color-primary);
  }

  /* Pricing rows */
  .pricing-row {
    border-bottom-color: var(--color-border);
  }

  /* Checklist */
  .checklist li {
    border-bottom-color: var(--color-border);
  }

  .checklist li::before {
    background: rgba(46, 204, 64, 0.15);
    color: var(--color-trust);
  }

  /* Specs table */
  .specs-table tr {
    border-bottom-color: var(--color-border);
  }

  /* Promo banner — stays brand red, no change needed */

  /* Lightbox — already dark */

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

  /* Logo in dark mode — always white (both hero and scrolled) */
  .nav-logo img,
  .nav.scrolled .nav-logo img {
    filter: brightness(0) invert(1);
  }

  /* Contact info icons */
  .contact-info-icon {
    background: var(--color-primary-light);
  }

  /* Image treatment — subtle border to separate from dark bg */
  .card-img,
  .fleet-card-img {
    border-bottom: 1px solid var(--color-border);
  }

  /* Outline buttons */
  .btn-outline {
    color: var(--color-text);
    border-color: var(--color-text);
  }

  .btn-outline:hover {
    background: var(--color-text);
    color: var(--color-bg);
  }

  /* Secondary dark button — invert for dark mode */
  .btn-dark {
    background: var(--color-text);
    color: var(--color-bg);
  }

  .btn-dark:hover {
    background: #FFFFFF;
    color: #000000;
  }

  /* Google Maps iframe — slight dim */
  .contact-map {
    filter: brightness(0.85) contrast(1.1);
  }

  /* FAQ category heading */
  .faq-category h3 {
    border-bottom-color: var(--color-text);
  }

  /* Steps number circle — stays brand colored */

  /* Social icons */
  .footer-social a {
    background: rgba(255, 255, 255, 0.08);
  }
}