/* ========== RESET & BASE ========== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #0f172a;
    color: #e2e8f0;
    min-height: 100vh;
    line-height: 1.6;
    background-image: 
        radial-gradient(circle at 15% 25%, rgba(6, 182, 212, 0.15) 0%, transparent 25%),
        radial-gradient(circle at 85% 75%, rgba(14, 165, 233, 0.15) 0%, transparent 25%);
    background-attachment: fixed;
}

/* ========== VARIABLES CSS ========== */
:root {
    /* Couleurs Primaires */
    --primary: #06b6d4;
    --primary-light: #0ea5e9;
    --primary-dark: #0891b2;
    
    /* Couleurs de Fond */
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --surface-glass: rgba(30, 41, 59, 0.7);
    
    /* Couleurs du Texte */
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --text-bright: #f1f5f9;
    
    /* Couleurs d'État */
    --success: #10b981;
    --success-dark: #059669;
    --error: #ef4444;
    --error-dark: #dc2626;
    --warning: #f59e0b;
    --warning-dark: #d97706;
    
    /* Bordures */
    --border-primary: rgba(6, 182, 212, 0.2);
    --border-primary-hover: rgba(6, 182, 212, 0.4);
    --border-surface: rgba(148, 163, 184, 0.2);
    
    /* Ombres */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.2);
    --shadow-glow-strong: 0 0 40px rgba(6, 182, 212, 0.4);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
}

/* ========== CONTAINER ========== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-bright);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========== LINKS ========== */
a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-light);
}

.link {
    color: var(--primary);
    text-decoration: underline;
    text-decoration-color: rgba(6, 182, 212, 0.3);
    text-underline-offset: 3px;
}

.link:hover {
    color: var(--primary-light);
    text-decoration-color: var(--primary-light);
}

/* ========== UTILITIES ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none !important; }
.visible { display: block !important; }

.glass {
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-primary);
}