/* Design System Foundation - Olivia Turner Portfolio */
/* Based on design-principles.md specifications */

:root {
    /* Color Palette - Canva-inspired Sage & Rose */
    --surface-primary: #FDFCFA;
    --surface-secondary: #F5F1ED;
    --surface-accent: #3D5A57;
    --border-subtle: #E8E4DF;
    --text-secondary: #7A8B88;
    --text-primary: #2A3534;
    --interactive-primary: #C89B96;
    --accent-sage: #3D5A57;
    --accent-rose: #C89B96;
    --system-success: #28A745;
    --system-error: #DC3545;

    /* Typography - Serif for elegance with fallbacks */
    --font-family-primary: 'Graphik', 'Inter', 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-serif: 'Libre Baskerville', 'Playfair Display', Georgia, serif;

    /* Modular Type Scale (1.250 ratio) */
    --font-size-h1: 3.052rem;      /* 48.83px */
    --font-size-h2: 2.441rem;      /* 39.06px */
    --font-size-h3: 1.953rem;      /* 31.25px */
    --font-size-h4: 1.563rem;      /* 25.00px */
    --font-size-body: 1.0rem;      /* 16.00px */
    --font-size-caption: 0.8rem;   /* 12.80px */

    /* Line Heights - Multiples of 4px */
    --line-height-h1: 56px;
    --line-height-h2: 48px;
    --line-height-h3: 40px;
    --line-height-h4: 32px;
    --line-height-body: 24px;
    --line-height-caption: 20px;

    /* Letter Spacing */
    --letter-spacing-tight: -0.015em;  /* -1.5% */
    --letter-spacing-snug: -0.01em;    /* -1% */
    --letter-spacing-normal: 0em;      /* 0% */
    --letter-spacing-wide: 0.005em;    /* +0.5% */
    --letter-spacing-wider: 0.01em;    /* +1% */

    /* Font Weights */
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;

    /* Spacing System - 8-point grid */
    --space-xxs: 4px;      /* Half unit for fine-tuning */
    --space-xs: 8px;       /* Smallest component padding */
    --space-sm: 16px;      /* Button padding, related elements */
    --space-md: 24px;      /* List gaps, paragraph spacing */
    --space-lg: 32px;      /* Large cards, distinct UI elements */
    --space-xl: 48px;      /* Major content sections */
    --space-xxl: 64px;     /* Page sections, major blocks */

    /* Grid System */
    --grid-margin-desktop: 80px;
    --grid-margin-tablet: 40px;
    --grid-margin-mobile: 24px;
    --grid-gutter-desktop: 24px;
    --grid-gutter-tablet: 24px;
    --grid-gutter-mobile: 16px;

    /* Animation & Timing */
    --duration-fast: 200ms;
    --duration-medium: 300ms;
    --duration-slow: 400ms;
    --duration-page-transition: 600ms;

    --easing-ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --easing-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-strong: 0 2px 4px rgba(0, 0, 0, 0.2);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* 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;
}

/* Base Reset & Foundation */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    line-height: 1.5;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    letter-spacing: var(--letter-spacing-wide);
    color: var(--text-primary);
    background-color: var(--surface-primary);
    font-weight: var(--font-weight-regular);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Typography Scale */
h1 {
    font-family: var(--font-family-serif);
    font-size: var(--font-size-h1);
    line-height: var(--line-height-h1);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--text-primary);
    margin: 0;
}

h2 {
    font-family: var(--font-family-serif);
    font-size: var(--font-size-h2);
    line-height: var(--line-height-h2);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-snug);
    color: var(--text-primary);
    margin: 0;
}

h3 {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-h3);
    line-height: var(--line-height-h3);
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--letter-spacing-normal);
    color: var(--text-primary);
    margin: 0;
}

h4 {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-h4);
    line-height: var(--line-height-h4);
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--letter-spacing-normal);
    color: var(--text-primary);
    margin: 0;
}

p {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    font-weight: var(--font-weight-regular);
    letter-spacing: var(--letter-spacing-wide);
    color: var(--text-primary);
    margin: 0;
}

small,
.caption {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-caption);
    line-height: var(--line-height-caption);
    font-weight: var(--font-weight-regular);
    letter-spacing: var(--letter-spacing-wider);
    color: var(--text-secondary);
    margin: 0;
}

/* Links */
a {
    color: var(--interactive-primary);
    text-decoration: none;
    transition: all var(--duration-fast) ease-out;
}

a:hover {
    color: var(--interactive-primary);
    transform: translateY(-1px);
}

a:focus {
    outline: 2px solid var(--interactive-primary);
    outline-offset: 2px;
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Grid Container */
.container {
    width: 100%;
    max-width: calc(1440px - (2 * var(--grid-margin-desktop)));
    margin: 0 auto;
    padding: 0 var(--grid-margin-desktop);
}

@media (max-width: 1439px) {
    .container {
        max-width: none;
        padding: 0 var(--grid-margin-tablet);
    }
}

@media (max-width: 767px) {
    .container {
        padding: 0 var(--grid-margin-mobile);
    }
}

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

.text-secondary {
    color: var(--text-secondary);
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fade-in-up var(--duration-page-transition) var(--easing-ease-out) forwards;
}

@keyframes fade-in-up {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Focus Management */
.focus-outline {
    outline: 2px solid var(--interactive-primary);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #666666;
        --interactive-primary: #8B5A2B;
        --border-subtle: #CCCCCC;
    }
}