/* 
 * Unified Design System for SereneAI & AlphaBeast
 * World-class design standards inspired by Spotify & Lifesum
 */

/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== CSS Custom Properties ===== */
:root {
    /* Spacing Scale (8px base) */
    --space-xs: 0.5rem;     /* 8px */
    --space-sm: 1rem;       /* 16px */
    --space-md: 1.5rem;     /* 24px */
    --space-lg: 2rem;       /* 32px */
    --space-xl: 3rem;       /* 48px */
    --space-2xl: 4rem;      /* 64px */
    --space-3xl: 6rem;      /* 96px */
    
    /* Typography Scale */
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 2rem;      /* 32px */
    --font-size-4xl: 2.5rem;    /* 40px */
    --font-size-5xl: 3rem;      /* 48px */
    --font-size-6xl: 4rem;      /* 64px */
    
    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    --font-black: 900;
    
    /* Line Heights */
    --leading-tight: 1.2;
    --leading-normal: 1.6;
    --leading-relaxed: 1.8;
    
    /* Letter Spacing */
    --tracking-tight: -0.02em;
    --tracking-normal: 0;
    --tracking-wide: 0.02em;
    --tracking-wider: 0.04em;
    --tracking-widest: 0.08em;
    
    /* Border Radius */
    --radius-sm: 0.25rem;    /* 4px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;       /* 16px */
    --radius-2xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ===== SereneAI Theme ===== */
.theme-serene {
    /* Colors */
    --color-primary: #6B5B95;
    --color-primary-light: #9B8DC4;
    --color-primary-dark: #4A3F6B;
    --color-secondary: #88B0D3;
    --color-secondary-light: #B5D3E7;
    --color-secondary-dark: #5A8AB0;
    --color-accent: #D6A4E0;
    
    /* Neutrals */
    --color-white: #FFFFFF;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    --color-black: #000000;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    --gradient-soft: linear-gradient(135deg, #E0E7FF 0%, #CFFAFE 100%);
    --gradient-radial: radial-gradient(circle at top left, var(--color-primary-light), transparent 50%);
    
    /* Component Colors */
    --bg-primary: var(--color-white);
    --bg-secondary: var(--color-gray-50);
    --text-primary: var(--color-gray-900);
    --text-secondary: var(--color-gray-600);
    --border-color: var(--color-gray-200);
}

/* ===== AlphaBeast Theme ===== */
.theme-beast {
    /* Colors */
    --color-primary: #FF4500;
    --color-primary-light: #FF6347;
    --color-primary-dark: #DC143C;
    --color-secondary: #FFD700;
    --color-secondary-light: #FFEA00;
    --color-secondary-dark: #FFA500;
    --color-accent: #FF1744;
    
    /* Dark Theme Neutrals */
    --color-white: #FFFFFF;
    --color-gray-50: #2a2a2a;
    --color-gray-100: #333333;
    --color-gray-200: #404040;
    --color-gray-300: #525252;
    --color-gray-400: #666666;
    --color-gray-500: #808080;
    --color-gray-600: #999999;
    --color-gray-700: #B3B3B3;
    --color-gray-800: #CCCCCC;
    --color-gray-900: #E6E6E6;
    --color-black: #0A0A0A;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    --gradient-energy: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-primary-dark) 100%);
    --gradient-fire: radial-gradient(circle at center, var(--color-secondary) 0%, var(--color-primary) 40%, var(--color-primary-dark) 100%);
    
    /* Component Colors */
    --bg-primary: var(--color-black);
    --bg-secondary: #1a1a1a;
    --text-primary: var(--color-white);
    --text-secondary: var(--color-gray-700);
    --border-color: var(--color-gray-200);
    
    /* Glow Effects */
    --glow-primary: 0 0 20px rgba(255, 69, 0, 0.6);
    --glow-secondary: 0 0 20px rgba(255, 215, 0, 0.6);
    --glow-intense: 0 0 40px rgba(255, 69, 0, 0.8);
}

/* ===== Typography Classes ===== */
.heading-display {
    font-size: clamp(var(--font-size-4xl), 6vw, var(--font-size-6xl));
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    font-weight: var(--font-black);
}

.heading-1 {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    font-weight: var(--font-extrabold);
}

.heading-2 {
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
    line-height: var(--leading-tight);
    font-weight: var(--font-bold);
}

.heading-3 {
    font-size: clamp(var(--font-size-xl), 3vw, var(--font-size-3xl));
    line-height: var(--leading-tight);
    font-weight: var(--font-bold);
}

.body-large {
    font-size: var(--font-size-lg);
    line-height: var(--leading-normal);
}

.body-base {
    font-size: var(--font-size-base);
    line-height: var(--leading-normal);
}

.body-small {
    font-size: var(--font-size-sm);
    line-height: var(--leading-normal);
}

/* ===== Button Components ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-semibold);
    line-height: 1;
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

/* Button Ripple Effect */
.btn::after {
    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 0.6s, height 0.6s;
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

/* ===== Card Components ===== */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ===== Form Components ===== */
.form-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-base);
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(107, 91, 149, 0.1);
}

/* ===== Navigation Component ===== */
.nav-modern {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    backdrop-filter: blur(10px);
    z-index: var(--z-sticky);
    padding: var(--space-sm) 0;
    transition: all var(--transition-base);
}

.nav-modern.scrolled {
    box-shadow: var(--shadow-md);
    padding: var(--space-xs) 0;
}

/* ===== Animation Classes ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out forwards;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

.animate-slideIn {
    animation: slideIn 0.5s ease-out forwards;
}

/* ===== Utility Classes ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-3xl) 0;
}

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

.text-balance {
    text-wrap: balance;
}

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

/* ===== Responsive Grid ===== */
.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-cols-1 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
}

@media (min-width: 640px) {
    .sm\:grid-cols-2 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 768px) {
    .md\:grid-cols-3 {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 1024px) {
    .lg\:grid-cols-4 {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

/* ===== Skeleton Loading ===== */
.skeleton {
    background: linear-gradient(90deg, 
        var(--color-gray-200) 25%, 
        var(--color-gray-100) 50%, 
        var(--color-gray-200) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

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

:focus:not(:focus-visible) {
    outline: none;
}

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

/* ===== Print Styles ===== */
@media print {
    .no-print {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
    }
    
    a {
        text-decoration: underline;
    }
}

/* ===== Accessibility Helpers ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #0000FF;
        --color-secondary: #FF00FF;
        --bg-primary: #FFFFFF;
        --text-primary: #000000;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .theme-serene {
        --bg-primary: var(--color-gray-900);
        --bg-secondary: var(--color-gray-800);
        --text-primary: var(--color-white);
        --text-secondary: var(--color-gray-300);
        --border-color: var(--color-gray-700);
    }
}