:root {
    /* ----------------------------------------------------------------------
       1. COLOR SYSTEM (Primitive & Semantic)
       ---------------------------------------------------------------------- */
    
    --color-nuetral-light: #f3f3f3;
    --color-accent-purple: #bcbfee;
    --color-accent-yellow: #e8eebc;
    --color-accent-salmon: #eecbbc;
    --color-accent-mint: #bceee4;
    --color-nuetral-dark: #000000;
    --color-text-light: #7b7b7b;


    /* ----------------------------------------------------------------------
       2. TYPOGRAPHY SYSTEM (Scalable Fluid Rem Scale)
       ---------------------------------------------------------------------- */
    /* Font Stacks */
    --font-family-sans: "Poppins", -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-family-mono: 'IBM Plex Mono', Consolas, 'Liberation Mono', Menlo, monospace;

    /* Font Sizes */
    --fs-sm: 0.875rem;
    --fs-md: 1rem;
    --fs-lg: 1.5rem;

    /* Font Weights */
    --fw-bold: 600;

    /* Line Heights */
    --line-height-none: 1.2;

    /* ----------------------------------------------------------------------
       3. SHAPE & ELEVATION (Borders, Borders Radii, Box Shadows)
       ---------------------------------------------------------------------- */

    --radius-standard: 30px;
    --radius-full: 9999px;

    --shadow: 0 4px 20px rgba(0, 0, 0, 0.05);

    /* Border Widths */
    --border-width: 1px;

    /* ----------------------------------------------------------------------
       4. SPACING & LAYOUT SYSTEM (4px/8px Incremental Grid)
       ---------------------------------------------------------------------- */
    --space-1: 0.25rem;                   /* 4px */
    --space-2: 0.5rem;                    /* 8px */
    --space-3: 0.75rem;                   /* 12px */
    --space-4: 1rem;                      /* 16px */
    --space-5: 1.25rem;                   /* 20px */
    --space-6: 1.5rem;                    /* 24px */
    --space-8: 2rem;                      /* 32px */
    --space-10: 2.5rem;                   /* 40px */
    --space-12: 3rem;                     /* 48px */

    /* ----------------------------------------------------------------------
       5. MOTION & INTERACTION TIMING
       ---------------------------------------------------------------------- */
    --transition-duration-fast: 150ms;
    --transition-duration-normal: 300ms;
    --transition-duration-slow: 500ms;
    
    --transition-timing-linear: linear;
    --transition-timing-standard: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-timing-out: cubic-bezier(0, 0, 0.2, 1);
    --transition-timing-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Hardware acceleration layer backup hint */
    --will-change-rendering: transform, opacity;
}

/* ==========================================================================
DEFAULTS (To be inherited across all view templates)
========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--color-nuetral-light);
    color: var(--color-nuetral-dark);
    font-family: var(--font-family-sans);
    font-size: var(--fs-lg);
    line-height: var(--line-height-none);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: var(--color-nuetral-dark);
    display: block;
    width: fit-content;
    margin-inline: auto;
}

h1 {
    font-weight: 400;
    font-size: var(--fs-lg);
}

h1, p {
    line-height: var(--line-height-none);
    display: inline;
}

ul {
    list-style-type: none;
}

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

.mono {
    font-family: var(--font-family-mono);
    font-size: var(--fs-sm);
    font-weight: 400;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.rounded-btn {
    border-radius: var(--radius-standard);
    box-shadow: var(--shadow);
    padding: var(--space-2) var(--space-6);
    border: 1px solid rgba(0, 0, 0, 0.05);
    background-color: var(--color-nuetral-light);
    transition: 0.1s ease-in-out;

    &:hover {
        border: 1px solid var(--color-nuetral-dark);
    }
}

.bounce {
    transform-origin: center center;
    will-change: transform;
    transition: transform 0.15s var(--transition-timing-spring);
}

.bounce:active {
    animation: micro-snap 0.2s var(--transition-timing-spring) both;
}

.section-padding {
    padding: 2rem;
}

body.nav-open {
    overflow: hidden;
    height: 100vh;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem;
}

header img {
    width: 100px;
    height: auto;
}

.menu-button {
    cursor: pointer;
    display: grid;
    align-items: center;
    width: 50px;
    height: 50px;
    padding: 0.8rem 0.7rem;
    background: none;
    border: none;
    position: relative;
    z-index: 9999;
}

header .menu-button .menu-bar {
    display: block;
    background-color: #000;
    width: 100%;
    height: 3px;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                width 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.4s ease;
}

header .menu-button .menu-bar:last-of-type {
    width: 75%;
    margin-left: auto;
}

body.nav-open header .menu-button .menu-bar {
    width: 100%;
}

body.nav-open header .menu-button .menu-bar:first-of-type {
    transform: translateY(6px) rotate(45deg);
}

body.nav-open header .menu-button .menu-bar:last-of-type {
    transform: translateY(-6px) rotate(-45deg);
}

/*******************************************
***************** NAVBAR *******************
*******************************************/

.primary-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-nuetral-light);
    
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    transform: translateY(-100%);
    z-index: 1000;
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

body.nav-open #primary-nav {
    transform: translateY(0);
}

.primary-nav ul li {
    list-style: none;
    text-align: center;
    margin: 2rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

body.nav-open #primary-nav ul li {
    opacity: 1;
    transform: translateY(0);
}

.primary-nav ul li a:hover {
    font-weight: var(--fw-bold);
}

body.nav-open #primary-nav ul li:nth-child(1) { transition-delay: 0.5s; }
body.nav-open #primary-nav ul li:nth-child(2) { transition-delay: 0.6s; }
body.nav-open #primary-nav ul li:nth-child(3) { transition-delay: 0.7s; }

footer {
    padding: 2rem;
    background-color: var(--color-accent-purple);
}

footer .footer-branding h2 {
    font-size: var(--fs-md);
    text-align: center;
}

footer .footer-branding nav ul li a {
    padding-block: 0.5rem;
    transition: 0.1s ease-in-out;

    &:hover {
        font-weight: 600;
    }
}

footer .footer-branding nav ul {
    padding-block: 2rem;
}

.footer-metadata {
    padding: 1rem;
    background-color: rgba(248, 248, 248, 0.2);
    color: var(--color-nuetral-dark);
    border-radius: var(--radius-standard);
    box-shadow: var(--shadow);
}

.footer-metadata p {
    display: block;
    text-align: center;
}

@keyframes micro-snap {
    0% {
        transform: scale(1) translateY(-1px);
    }
    40% {
        transform: scale(0.9) translateY(5px); 
    }
    100% {
        transform: scale(1) translateY(0);
    }
}

@media only screen and (min-width: 48rem) {
    
    :root {

        /* Line Heights */
        --line-height-none: 1.2;

        /* Font Sizes */
        --fs-sm: 0.875rem;
        --fs-lg: 2rem;
    }

    .menu-button {
        display: none;
    }

    .primary-nav {
        position: static;
        width: auto;
        height: auto;
        background-color: transparent;
        
        display: flex;
        flex-direction: row;
        justify-content: center;
        align-items: center;

        transform: none;
        z-index: 1;
    }

    .primary-nav ul {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 3rem;
    }

    .primary-nav ul li {
        margin: 0;
        opacity: 1;
        transform: none;
    }

}

@media only screen and (min-width: 75rem) {
    
    :root {

        /* Line Heights */
        --line-height-none: 1.1;

        /* Font Sizes */
        --fs-sm: 0.875rem;
        --fs-lg: 3.5rem;
    }

    .primary-nav ul {
        gap: 5rem;
    }

}