/* Apple Design System Base Styles */
/* Based on Apple Human Interface Guidelines */

:root {
    /* Apple System Colors - Light Mode */
    --apple-system-background: #FFFFFF;
    --apple-secondary-background: #F2F2F7;
    --apple-tertiary-background: #FFFFFF;
    --apple-grouped-background: #F2F2F7;
    --apple-secondary-grouped-background: #FFFFFF;
    --apple-tertiary-grouped-background: #F2F2F7;
    
    /* Apple Label Colors */
    --apple-label: #000000;
    --apple-secondary-label: rgba(60, 60, 67, 0.6);
    --apple-tertiary-label: rgba(60, 60, 67, 0.3);
    --apple-quaternary-label: rgba(60, 60, 67, 0.16);
    
    /* Apple Fill Colors */
    --apple-system-fill: rgba(120, 120, 128, 0.2);
    --apple-secondary-fill: rgba(120, 120, 128, 0.16);
    --apple-tertiary-fill: rgba(120, 120, 128, 0.12);
    --apple-quaternary-fill: rgba(120, 120, 128, 0.08);
    
    /* Apple Separator */
    --apple-separator: rgba(60, 60, 67, 0.29);
    --apple-opaque-separator: #C6C6C8;
    
    /* Apple Accent Color (from app) */
    --apple-accent: #008F51;
    --apple-accent-hover: #007A44;
    
    /* Apple 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;
    
    /* Apple Typography */
    --font-size-large-title: 34px;
    --font-size-title-1: 28px;
    --font-size-title-2: 22px;
    --font-size-title-3: 20px;
    --font-size-headline: 17px;
    --font-size-body: 17px;
    --font-size-callout: 16px;
    --font-size-subheadline: 15px;
    --font-size-footnote: 13px;
    --font-size-caption-1: 12px;
    --font-size-caption-2: 11px;
    
    /* Apple Line Heights */
    --line-height-tight: 1.2;
    --line-height-normal: 1.4;
    --line-height-relaxed: 1.6;
    
    /* Apple Border Radius */
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    
    /* Apple Shadows */
    --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, 0.1);
    
    /* Apple Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Apple System Colors - Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --apple-system-background: #000000;
        --apple-secondary-background: #1C1C1E;
        --apple-tertiary-background: #2C2C2E;
        --apple-grouped-background: #000000;
        --apple-secondary-grouped-background: #1C1C1E;
        --apple-tertiary-grouped-background: #2C2C2E;
        
        /* Apple Label Colors - Dark */
        --apple-label: #FFFFFF;
        --apple-secondary-label: rgba(235, 235, 245, 0.6);
        --apple-tertiary-label: rgba(235, 235, 245, 0.3);
        --apple-quaternary-label: rgba(235, 235, 245, 0.16);
        
        /* Apple Fill Colors - Dark */
        --apple-system-fill: rgba(120, 120, 128, 0.36);
        --apple-secondary-fill: rgba(120, 120, 128, 0.32);
        --apple-tertiary-fill: rgba(120, 120, 128, 0.24);
        --apple-quaternary-fill: rgba(120, 120, 128, 0.18);
        
        /* Apple Separator - Dark */
        --apple-separator: rgba(84, 84, 88, 0.65);
        --apple-opaque-separator: #38383A;
        
        /* Shadows - Dark Mode */
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
        --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.3);
    }
}

* {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: var(--font-size-body);
    line-height: var(--line-height-relaxed);
    color: var(--apple-label);
    background-color: var(--apple-system-background);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Apple Typography Scale */
h1 {
    font-size: var(--font-size-large-title);
    font-weight: 700;
    line-height: var(--line-height-tight);
    letter-spacing: 0.37px;
    color: var(--apple-label);
    margin: 0;
}

h2 {
    font-size: var(--font-size-title-2);
    font-weight: 600;
    line-height: var(--line-height-tight);
    letter-spacing: 0.35px;
    color: var(--apple-label);
    margin: 0;
}

h3 {
    font-size: var(--font-size-title-3);
    font-weight: 600;
    line-height: var(--line-height-normal);
    letter-spacing: 0.38px;
    color: var(--apple-label);
    margin: 0;
}

h4 {
    font-size: var(--font-size-headline);
    font-weight: 600;
    line-height: var(--line-height-normal);
    color: var(--apple-label);
    margin: 0;
}

p {
    font-size: var(--font-size-body);
    line-height: var(--line-height-relaxed);
    color: var(--apple-label);
    margin: 0;
}

/* Apple Links */
a {
    color: var(--apple-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

a:hover {
    color: var(--apple-accent-hover);
    text-decoration: none;
}

a:active {
    opacity: 0.7;
}

/* Apple Buttons */
button, .btn {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", sans-serif;
    font-size: var(--font-size-body);
    font-weight: 500;
    letter-spacing: -0.41px;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

/* Apple Lists */
ul, ol {
    margin: 0;
    padding-left: var(--spacing-lg);
}

li {
    font-size: var(--font-size-body);
    line-height: var(--line-height-relaxed);
    margin: var(--spacing-xs) 0;
    color: var(--apple-label);
}

/* Apple Cards */
.card {
    background-color: var(--apple-system-background);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Apple Separators */
.separator {
    height: 0.5px;
    background-color: var(--apple-separator);
    margin: var(--spacing-md) 0;
}

/* Apple Focus States */
*:focus-visible {
    outline: 2px solid var(--apple-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Apple Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

/* Apple Responsive Typography */
@media (max-width: 768px) {
    :root {
        --font-size-large-title: 28px;
        --font-size-title-1: 22px;
        --font-size-title-2: 20px;
        --font-size-title-3: 18px;
        --font-size-headline: 17px;
        --font-size-body: 17px;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-large-title: 26px;
        --font-size-title-1: 20px;
        --font-size-title-2: 18px;
        --font-size-title-3: 17px;
        --font-size-headline: 16px;
        --font-size-body: 16px;
    }
}