/* ============================================
   GARRETT SMITH PORTFOLIO — BASE STYLES
   Shared design tokens, reset, and components
   ============================================ */

:root {
    /* ── Core Colors ── */
    --color-dark: #0F0F0F;
    --color-light: #FFFFFF;
    --color-text-primary: #F9FAFB;
    --color-text-body: rgba(249, 250, 251, 0.62);
    --color-text-secondary: #A3A3A3;
    --color-pop: #0369A1;
    --color-pop-dark: #38bdf8;

    /* ── Derived Colors ── */
    --color-dark-elevated: #171717;
    --color-light-muted: #FAFAFA;
    --color-border-dark: #262626;
    --color-border-light: #E5E5E5;
    --color-text-dark: #0F0F0F;
    --color-text-dark-muted: #525252;

    /* ── Overlay Colors ── */
    --overlay-nav: rgba(15, 15, 15, 0.55);
    --overlay-modal: rgba(15, 15, 15, 0.97);
    --overlay-lightbox: rgba(0, 0, 0, 0.85);
    --color-pop-dark-alpha: rgba(56, 189, 248, 0.25);
    --color-pop-alpha: rgba(3, 105, 161, 0.04);

    /* ── Semantic Status Colors ── */
    --color-danger: #f87171;

    /* ── Border Opacity Levels ── */
    --border-subtle: rgba(255, 255, 255, 0.12);
    --border-light: rgba(255, 255, 255, 0.25);
    --border-medium: rgba(255, 255, 255, 0.35);
    --border-subtle-dark: rgba(0, 0, 0, 0.08);
    --border-light-dark: rgba(0, 0, 0, 0.12);
    --border-medium-dark: rgba(0, 0, 0, 0.15);

    /* ── Typography — Families ── */
    --font-display: 'Roboto', sans-serif;
    --font-heading: 'Roboto', sans-serif;
    --font-body: 'Roboto', sans-serif;

    /* ── Typography — Weights ── */
    --weight-thin: 100;
    --weight-light: 300;
    --weight-regular: 400;
    --weight-medium: 500;
    --weight-bold: 700;

    /* ── Typography — Sizes ── */
    --text-hero: clamp(4rem, 7vw, 8rem);
    --text-h1: clamp(2.5rem, 5vw, 4rem);
    --text-h2: clamp(2rem, 4vw, 3rem);
    --text-h2-small: clamp(1.35rem, 2.5vw, 1.75rem);
    --text-h3: clamp(1.1rem, 2vw, 1.35rem);
    --text-body: clamp(1rem, 1.5vw, 1.15rem);
    --text-small: 0.875rem;
    --text-label: 0.75rem;
    --text-xs: 0.65rem;

    /* ── Typography — Line Heights ── */
    --leading-tight: 1.15;
    --leading-snug: 1.4;
    --leading-normal: 1.6;
    --leading-body: 1.8;

    /* ── Typography — Letter Spacing ── */
    --tracking-tight: -0.01em;
    --tracking-normal: 0;
    --tracking-body: 0.01em;
    --tracking-card: 0.02em;
    --tracking-heading: 0.08em;
    --tracking-meta: 0.1em;
    --tracking-display: 0.12em;
    --tracking-wide: 0.15em;
    --tracking-wider: 0.2em;
    --tracking-brand: 0.25em;

    /* ── Spacing Scale ── */
    --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 */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */
    --space-32: 8rem;     /* 128px */

    /* ── Border Radius ── */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 50%;
    --radius-pill: 999px;

    /* ── Shadows ── */
    --shadow-card-hover: 0 22px 60px rgba(0, 0, 0, 0.35);

    /* ── Z-Index Scale ── */
    --z-base: 0;
    --z-content: 1;
    --z-raised: 2;
    --z-grain: 90;
    --z-nav-overlay: 99;
    --z-nav: 100;
    --z-nav-toggle: 101;
    --z-modal: 200;

    /* ── Transitions — Durations ── */
    --duration-fast: 0.2s;
    --duration-base: 0.3s;
    --duration-medium: 0.4s;
    --duration-slow: 0.6s;
    --duration-slower: 0.8s;

    /* ── Transitions — Easing ── */
    --ease-default: ease;
    --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-sharp: cubic-bezier(0.4, 0, 1, 1);
}


/* ============================================
   RESET
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
}


/* ============================================
   GRAIN TEXTURE OVERLAY
   ============================================ */

body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: var(--z-grain);
    pointer-events: none;
    opacity: 0.025;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    mix-blend-mode: multiply;
}


/* ============================================
   NAVIGATION — FROSTED GLASS
   ============================================ */

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--space-3) var(--space-20);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: var(--z-nav);
    background: var(--overlay-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 0;
    cursor: pointer;
    text-decoration: none;
}

.logo {
    font-family: var(--font-body);
    font-size: var(--text-label);
    font-weight: var(--weight-bold);
    color: var(--color-light);
    text-decoration: none;
    letter-spacing: var(--tracking-brand);
    text-transform: uppercase;
    transition: color var(--duration-base) var(--ease-default);
}

.logo-divider {
    margin: 0 var(--space-4);
    color: var(--color-light);
    font-weight: var(--weight-bold);
    font-size: var(--text-label);
    transition: color var(--duration-base) var(--ease-default);
}

.logo-subtitle {
    font-family: var(--font-body);
    font-size: var(--text-label);
    text-decoration: none;
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-brand);
    text-transform: uppercase;
    color: var(--color-light);
    transition: color var(--duration-base) var(--ease-default);
}

@media (hover: hover) {
    .logo-group:hover .logo,
    .logo-group:hover .logo-divider,
    .logo-group:hover .logo-subtitle {
        color: var(--color-pop-dark);
    }
}

/* Nav back link (case study pages) */
.nav-back {
    font-family: var(--font-body);
    color: var(--color-light);
    text-decoration: none;
    font-size: var(--text-label);
    font-weight: var(--weight-medium);
    text-transform: uppercase;
    transition: color var(--duration-base) var(--ease-default);
    letter-spacing: var(--tracking-brand);
}

.nav-back:hover {
    color: var(--color-pop-dark);
}


/* ============================================
   FOOTER
   ============================================ */

.site-footer {
    background: var(--overlay-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--space-10) var(--space-20);
    position: relative;
    z-index: var(--z-content);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-name {
    font-size: var(--text-label);
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-brand);
    text-transform: uppercase;
    color: var(--color-text-primary);
}

.footer-copy {
    font-size: var(--text-label);
    letter-spacing: var(--tracking-meta);
    color: var(--color-text-secondary);
    opacity: 0.5;
}

@media (max-width: 768px) {
    .site-footer {
        padding: var(--space-10) var(--space-8);
    }
}


/* ============================================
   SCROLL REVEAL
   ============================================ */

[data-reveal] {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity var(--duration-slower) var(--ease-spring),
                transform var(--duration-slower) var(--ease-spring);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}


/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* ============================================
   FOCUS / ACCESSIBILITY
   ============================================ */

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-pop-dark);
    outline-offset: 3px;
}


/* ============================================
   REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    [data-reveal] {
        opacity: 1 !important;
        transform: none !important;
    }
}


/* ============================================
   SHARED CASE CARD STYLES
   (used in work-section on index + more-work on case studies)
   ============================================ */

.case-card {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    position: relative;
}

.case-img {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    margin-bottom: var(--space-6);
}

.case-img-inner {
    width: 100%;
    height: 100%;
    filter: grayscale(100%);
    transition: transform 0.7s var(--ease-spring);
}

.case-card:hover .case-img-inner {
    transform: scale(1.03);
}

.case-client {
    font-size: var(--text-label);
    font-weight: var(--weight-medium);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    margin-bottom: var(--space-3);
}

.case-title {
    font-size: var(--text-h2-small);
    font-weight: var(--weight-bold);
    line-height: 1.35;
    letter-spacing: var(--tracking-body);
    margin-bottom: var(--space-4);
    transition: color var(--duration-base) var(--ease-default);
}

.case-meta {
    font-size: var(--text-label);
    font-weight: var(--weight-medium);
    text-transform: uppercase;
    letter-spacing: var(--tracking-meta);
}

.case-meta-divider {
    margin: 0 0.6em;
    opacity: 0.4;
}

/* Circle arrow button (shared) */
.case-arrow {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--duration-medium) var(--ease-default),
                border-color var(--duration-medium) var(--ease-default);
}

.case-arrow svg {
    width: 14px;
    height: 14px;
}


/* ============================================
   RESPONSIVE — NAV
   ============================================ */

@media (max-width: 1024px) {
    nav {
        padding: var(--space-3) var(--space-12);
    }
}

@media (max-width: 768px) {
    nav {
        padding: var(--space-3) var(--space-8);
    }

    .logo-subtitle,
    .logo-divider {
        display: none;
    }
}