/*------------------------------------------------------------------
[CSS Variables - Tilda Design System]

Design tokens pour AVANTI Frontend v2.0
Basé sur les spécifications Tilda (systeme.mdc)
-------------------------------------------------------------------*/

:root {
  /* ==================== COLORS (Tilda Palette) ==================== */
  /* Primary Colors */
  --color-primary: #2C3E50;        /* Bleu foncé - Navigation, texte principal */
  --color-secondary: #3C5189;      /* Bleu moyen - Accents secondaires */
  --color-light-blue: #5B8FD8;     /* Bleu clair - Liens */

  /* Accent Colors */
  --color-accent: #FFC107;         /* Jaune - Boutons CTA principaux */
  --color-magenta: #E91E63;        /* Rose/Magenta - Highlights */
  --color-orange: #E84C3D;         /* Orange/Rouge - Alertes, promotions */
  --color-cyan: #00BFA5;           /* Cyan/Vert - Succès */

  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray-light: #F5F5F5;     /* Backgrounds sections */
  --color-gray-medium: #CCCCCC;    /* Borders, dividers */
  --color-text: #3F3F3F;           /* Texte corps */
  --color-text-light: #6A6A6A;     /* Texte secondaire */

  /* Semantic Colors */
  --color-success: #00BFA5;
  --color-warning: #FFC107;
  --color-error: #E84C3D;
  --color-info: #5B8FD8;

  /* ==================== TYPOGRAPHY ==================== */
  /* Font Families */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;

  /* Fluid Typography (responsive avec clamp) */
  --font-size-h1: clamp(2rem, 5vw + 1rem, 3rem);           /* 32px - 48px */
  --font-size-h2: clamp(1.5rem, 4vw + 0.5rem, 2rem);       /* 24px - 32px */
  --font-size-h3: clamp(1.25rem, 3vw + 0.5rem, 1.5rem);    /* 20px - 24px */
  --font-size-h4: clamp(1.125rem, 2vw + 0.5rem, 1.25rem);  /* 18px - 20px */
  --font-size-h5: clamp(1rem, 1.5vw + 0.5rem, 1.125rem);   /* 16px - 18px */
  --font-size-h6: clamp(0.875rem, 1.5vw, 1rem);            /* 14px - 16px */
  --font-size-body: clamp(0.875rem, 2vw, 1rem);            /* 14px - 16px */
  --font-size-small: clamp(0.75rem, 1.5vw, 0.875rem);      /* 12px - 14px */
  --font-size-tiny: 0.75rem;                                /* 12px */

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

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.6;
  --line-height-loose: 1.8;

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

  /* ==================== SPACING SYSTEM (8px base) ==================== */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 96px;
  --spacing-5xl: 128px;

  /* ==================== LAYOUT ==================== */
  /* Container Widths */
  --container-xs: 320px;
  --container-sm: 480px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1440px;
  --container-max: 1600px;

  /* Grid Gaps */
  --gap-xs: var(--spacing-xs);
  --gap-sm: var(--spacing-sm);
  --gap-md: var(--spacing-md);
  --gap-lg: var(--spacing-lg);
  --gap-xl: var(--spacing-xl);

  /* Section Padding */
  --section-padding-mobile: var(--spacing-2xl);    /* 48px */
  --section-padding-tablet: var(--spacing-3xl);    /* 64px */
  --section-padding-desktop: var(--spacing-4xl);   /* 96px */

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

  /* Border Width */
  --border-thin: 1px;
  --border-normal: 2px;
  --border-thick: 4px;

  /* Border Colors */
  --border-color-light: var(--color-gray-light);
  --border-color-medium: var(--color-gray-medium);
  --border-color-dark: var(--color-text-light);

  /* ==================== SHADOWS ==================== */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);

  /* Button Shadow (Tilda spec) */
  --shadow-button-hover: 0 4px 12px rgba(0, 0, 0, 0.15);

  /* Card Shadow (Tilda spec) */
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.1);

  /* ==================== TRANSITIONS ==================== */
  /* Durations */
  --transition-fast: 150ms;
  --transition-normal: 300ms;
  --transition-slow: 500ms;
  --transition-slower: 700ms;

  /* Easing Functions */
  --easing-linear: linear;
  --easing-ease: ease;
  --easing-ease-in: ease-in;
  --easing-ease-out: ease-out;
  --easing-ease-in-out: ease-in-out;
  --easing-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Combined Transitions (Tilda spec) */
  --transition-button: opacity var(--transition-normal) var(--easing-ease-in-out);
  --transition-card: transform var(--transition-normal) var(--easing-smooth);
  --transition-fade: opacity var(--transition-normal) var(--easing-ease-in-out);

  /* ==================== Z-INDEX SCALE ==================== */
  --z-base: 1;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-notification: 1080;

  /* ==================== BREAKPOINTS (for JS/Container Queries) ==================== */
  --breakpoint-xs: 320px;
  --breakpoint-sm: 480px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1440px;

  /* ==================== COMPONENTS SPECIFIC ==================== */
  /* Buttons */
  --button-padding-y: 12px;
  --button-padding-x: 16px;
  --button-padding-sm-y: 8px;
  --button-padding-sm-x: 12px;
  --button-padding-lg-y: 16px;
  --button-padding-lg-x: 24px;
  --button-border-radius: var(--radius-md);

  /* Forms */
  --input-padding-y: 12px;
  --input-padding-x: 16px;
  --input-border-radius: var(--radius-md);
  --input-border-color: var(--border-color-medium);
  --input-focus-color: var(--color-accent);

  /* Cards */
  --card-padding: var(--spacing-lg);
  --card-border-radius: var(--radius-lg);
  --card-shadow: var(--shadow-card);

  /* Navigation */
  --nav-height-mobile: 60px;
  --nav-height-desktop: 80px;
  --nav-z-index: var(--z-sticky);

  /* ==================== ACCESSIBILITY ==================== */
  /* Focus Ring */
  --focus-ring-width: 2px;
  --focus-ring-offset: 2px;
  --focus-ring-color: var(--color-accent);

  /* Touch Targets (minimum 44x44px for mobile) */
  --touch-target-min: 44px;
}

/* ==================== DARK MODE SUPPORT (Optional) ==================== */
@media (prefers-color-scheme: dark) {
  :root {
    /* Inverser couleurs pour dark mode si nécessaire */
    /* --color-background: #1a1a1a; */
    /* --color-text: #ffffff; */
  }
}

/* ==================== PRINT STYLES ==================== */
@media print {
  :root {
    /* Simplifier variables pour impression */
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
  }
}