/* ============================================
   🎨 DESIGN SYSTEM UNIFIÉ — OS HUMAIN × YVES WAUTHIER
   Palette index.html : Cyan #00D9FF + Bordeaux #8B0E3E
   Glassmorphisme premium + Typography Apple
   ============================================ */

:root {
    /* === PALETTE BICOLORE THÉRAPEUTIQUE === */
    --cyan-electric: #00D9FF;
    --bordeaux-deep: #8B0E3E;
    --cyan-glow: rgba(0, 217, 255, 0.3);
    --bordeaux-glow: rgba(139, 14, 62, 0.3);
    --cyan-light: rgba(0, 217, 255, 0.15);
    --bordeaux-light: rgba(139, 14, 62, 0.15);
    
    /* === NEUTRAL BASE === */
    --bg-absolute: #000000;
    --bg-deep: #0A0A0F;
    --bg-card: #0F0F14;
    --text-pure: #FFFFFF;
    --text-bright: #F5F5F7;
    --text-soft: #B5B5C5;
    --text-dim: #6B6B7B;
    
    /* === GLASS MATERIAL === */
    --glass-ultra: rgba(255, 255, 255, 0.03);
    --glass-light: rgba(255, 255, 255, 0.06);
    --glass-medium: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-border-hover: rgba(0, 217, 255, 0.4);
    --glass-border-active: rgba(0, 217, 255, 0.6);
    
    /* === SHADOWS & DEPTH === */
    --shadow-deep: 0 10px 40px rgba(0, 0, 0, 0.7);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-cyan: 0 8px 40px var(--cyan-glow);
    --shadow-bordeaux: 0 8px 40px var(--bordeaux-glow);
    --shadow-floating: 0 20px 60px rgba(0, 0, 0, 0.8);
    
    /* === SEMANTIC COLORS === */
    --success: #6BCF7B;
    --success-glow: rgba(107, 207, 123, 0.3);
    --warning: #E3C27B;
    --warning-glow: rgba(227, 194, 123, 0.3);
    --danger: #E89A7B;
    --danger-glow: rgba(232, 154, 123, 0.3);
    --info: var(--cyan-electric);
    --info-glow: var(--cyan-glow);
    
    /* === TYPOGRAPHY === */
    --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', sans-serif;
    --font-text: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', Monaco, Consolas, monospace;
    
    /* === APPLE PREMIUM TIMING === */
    --ease-premium: cubic-bezier(0.25, 0.1, 0.25, 1.0);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.4, 0.0, 0.2, 1);
    --duration-fast: 0.2s;
    --duration-smooth: 0.4s;
    --duration-slow: 0.8s;
    
    /* === SPACING SYSTEM (8px base) === */
    --space-xs: 0.25rem;  /* 4px */
    --space-sm: 0.5rem;   /* 8px */
    --space-md: 1rem;     /* 16px */
    --space-lg: 1.5rem;   /* 24px */
    --space-xl: 2rem;     /* 32px */
    --space-2xl: 3rem;    /* 48px */
    --space-3xl: 4rem;    /* 64px */
    
    /* === BORDER RADIUS === */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* === BLUR LEVELS === */
    --blur-sm: 10px;
    --blur-md: 20px;
    --blur-lg: 30px;
}

/* ============================================
   🎯 RESET & BASE
   ============================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-text);
    background: 
        radial-gradient(circle at 20% 30%, var(--bordeaux-glow) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, var(--cyan-glow) 0%, transparent 50%),
        linear-gradient(135deg, var(--bordeaux-deep) 0%, var(--bg-absolute) 50%, #001A2E 100%);
    background-size: 100% 100%;
    background-attachment: fixed;
    color: var(--text-pure);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === TEXTURE OVERLAY === */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.03) 0px, rgba(255, 255, 255, 0.03) 1px, transparent 1px, transparent 4px),
        repeating-linear-gradient(-45deg, rgba(0, 217, 255, 0.02) 0px, rgba(0, 217, 255, 0.02) 1px, transparent 1px, transparent 4px),
        repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.025) 0px, transparent 1px, transparent 3px, rgba(255, 255, 255, 0.025) 4px),
        repeating-linear-gradient(0deg, rgba(139, 14, 62, 0.02) 0px, transparent 1px, transparent 3px, rgba(139, 14, 62, 0.02) 4px);
    pointer-events: none;
    z-index: 1;
    opacity: 0.6;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: 3rem; }      /* 48px */
h2 { font-size: 2.25rem; }   /* 36px */
h3 { font-size: 1.75rem; }   /* 28px */
h4 { font-size: 1.5rem; }    /* 24px */
h5 { font-size: 1.25rem; }   /* 20px */
h6 { font-size: 1rem; }      /* 16px */

p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-soft);
}

a {
    color: var(--cyan-electric);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-premium);
}

a:hover {
    color: var(--text-pure);
}

/* ============================================
   🧩 COMPONENTS — GLASS CARDS
   ============================================ */

.glass-card {
    background: var(--glass-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    padding: var(--space-xl);
    box-shadow: var(--shadow-card);
    transition: all var(--duration-smooth) var(--ease-premium);
    position: relative;
    z-index: 2;
}

.glass-card:hover {
    border-color: var(--glass-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-floating);
}

.glass-card--cyan {
    border-color: rgba(0, 217, 255, 0.2);
    box-shadow: var(--shadow-cyan);
}

.glass-card--bordeaux {
    border-color: rgba(139, 14, 62, 0.2);
    box-shadow: var(--shadow-bordeaux);
}

.glass-card--success {
    border-color: rgba(107, 207, 123, 0.2);
    box-shadow: 0 8px 40px var(--success-glow);
}

/* ============================================
   🔘 BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border: none;
    border-radius: var(--radius-full);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--duration-smooth) var(--ease-premium);
    position: relative;
    overflow: hidden;
    z-index: 2;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width var(--duration-smooth) var(--ease-bounce), 
                height var(--duration-smooth) var(--ease-bounce);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: scale(0.95);
}

/* Button Variants */
.btn--primary {
    background: linear-gradient(135deg, var(--cyan-electric), #0088CC);
    color: var(--bg-absolute);
    box-shadow: var(--shadow-cyan);
}

.btn--primary:hover {
    box-shadow: 0 12px 50px var(--cyan-glow);
    transform: translateY(-2px);
}

.btn--secondary {
    background: linear-gradient(135deg, var(--bordeaux-deep), #660030);
    color: var(--text-pure);
    box-shadow: var(--shadow-bordeaux);
}

.btn--secondary:hover {
    box-shadow: 0 12px 50px var(--bordeaux-glow);
    transform: translateY(-2px);
}

.btn--ghost {
    background: var(--glass-light);
    border: 1px solid var(--glass-border);
    color: var(--text-pure);
    backdrop-filter: blur(var(--blur-sm));
}

.btn--ghost:hover {
    border-color: var(--cyan-electric);
    background: var(--glass-medium);
}

.btn--success {
    background: linear-gradient(135deg, var(--success), #4CAF50);
    color: var(--bg-absolute);
    box-shadow: 0 8px 40px var(--success-glow);
}

.btn--danger {
    background: linear-gradient(135deg, var(--danger), #D32F2F);
    color: var(--text-pure);
    box-shadow: 0 8px 40px var(--danger-glow);
}

/* Button Sizes */
.btn--sm {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
}

.btn--lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.125rem;
}

/* ============================================
   📝 FORM ELEMENTS
   ============================================ */

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-soft);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-md);
    background: var(--glass-ultra);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-pure);
    font-family: var(--font-text);
    font-size: 1rem;
    transition: all var(--duration-smooth) var(--ease-premium);
    backdrop-filter: blur(var(--blur-sm));
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--cyan-electric);
    box-shadow: 0 0 0 4px var(--cyan-light);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* ============================================
   🏷️ BADGES & TAGS
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge--cyan {
    background: var(--cyan-light);
    color: var(--cyan-electric);
    border: 1px solid rgba(0, 217, 255, 0.3);
}

.badge--bordeaux {
    background: var(--bordeaux-light);
    color: var(--bordeaux-deep);
    border: 1px solid rgba(139, 14, 62, 0.3);
}

.badge--success {
    background: rgba(107, 207, 123, 0.15);
    color: var(--success);
    border: 1px solid rgba(107, 207, 123, 0.3);
}

.badge--warning {
    background: rgba(227, 194, 123, 0.15);
    color: var(--warning);
    border: 1px solid rgba(227, 194, 123, 0.3);
}

.badge--danger {
    background: rgba(232, 154, 123, 0.15);
    color: var(--danger);
    border: 1px solid rgba(232, 154, 123, 0.3);
}

/* ============================================
   📊 PROGRESS & METERS
   ============================================ */

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--glass-ultra);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-bar__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--cyan-electric), var(--bordeaux-deep));
    border-radius: var(--radius-full);
    transition: width var(--duration-slow) var(--ease-premium);
    box-shadow: 0 0 20px var(--cyan-glow);
}

/* ============================================
   🔔 ALERTS & NOTIFICATIONS
   ============================================ */

.alert {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid;
    backdrop-filter: blur(var(--blur-md));
    display: flex;
    align-items: start;
    gap: var(--space-md);
}

.alert--info {
    background: var(--cyan-light);
    border-color: var(--cyan-electric);
    color: var(--text-bright);
}

.alert--success {
    background: rgba(107, 207, 123, 0.15);
    border-color: var(--success);
    color: var(--text-bright);
}

.alert--warning {
    background: rgba(227, 194, 123, 0.15);
    border-color: var(--warning);
    color: var(--text-bright);
}

.alert--danger {
    background: rgba(232, 154, 123, 0.15);
    border-color: var(--danger);
    color: var(--text-bright);
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-center { justify-content: center; align-items: center; }
.flex-between { justify-content: space-between; align-items: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* ============================================
   📱 RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .glass-card {
        padding: var(--space-lg);
    }
    
    .container {
        padding: 0 var(--space-md);
    }
}