/* ============================================================
   Niru ML - Design System
   Single source of truth for all styles across the site.
   ============================================================ */

/* --- Design Tokens (CSS Custom Properties) --- */
:root {
    /* Colors */
    --color-bg:            #000000;
    --color-text:          #FFFFFF;
    --color-text-muted:    #A0A0A0;
    --color-text-subtle:   #6B7280;
    --color-border:        #374151;
    --color-border-hover:  #FFFFFF;
    --color-accent:        #D1D5DB;

    /* Typography */
    --font-body:    'Work Sans', sans-serif;
    --font-heading: 'EB Garamond', serif;
    --line-height:  1.75;

    /* Spacing */
    --space-xs:    0.25rem;
    --space-sm:    0.5rem;
    --space-md:    1rem;
    --space-lg:    1.5rem;
    --space-xl:    2rem;
    --space-2xl:   3rem;
    --space-3xl:   4rem;

    /* Layout */
    --max-width-content:  42rem;   /* ~672px - main text */
    --max-width-wide:     56rem;   /* ~896px - header/footer */

    /* Transitions */
    --transition-fast: 0.3s ease;
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: var(--space-xl);
    line-height: var(--line-height);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: 0.02em;
}

h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--space-md);
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--space-md);
}

h3 {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    margin-bottom: var(--space-sm);
}

p {
    color: var(--color-accent);
    line-height: var(--line-height);
    margin-bottom: var(--space-md);
    font-size: 0.9375rem;
}

strong {
    color: var(--color-text);
    font-weight: 700;
}

/* --- Links --- */
a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-text);
}

/* --- Separator --- */
.separator {
    width: 60px;
    height: 1px;
    background-color: var(--color-text);
    margin: var(--space-lg) auto;
}

/* --- Header --- */
.site-header {
    width: 100%;
    max-width: var(--max-width-wide);
    text-align: center;
    margin-bottom: var(--space-3xl);
    margin-top: var(--space-xl);
}

.logo-img {
    max-height: 60px;
    width: auto;
}

.site-nav {
    margin-top: var(--space-md);
}

.site-nav a {
    margin: 0 var(--space-sm);
    font-size: 0.875rem;
}

.site-nav a.active {
    color: var(--color-text);
    font-weight: 700;
}

/* --- Main Content --- */
.site-main {
    width: 100%;
    max-width: var(--max-width-content);
    flex-grow: 1;
    padding: 0 var(--space-md);
}

.site-main.centered {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

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

/* --- Sections --- */
section {
    margin-bottom: var(--space-2xl);
}

/* --- Lists --- */
.site-main ul {
    list-style: none;
    padding-left: 0;
    margin-top: var(--space-sm);
}

.site-main ul li {
    margin-bottom: var(--space-sm);
    line-height: var(--line-height);
    padding-left: 1.5em;
    position: relative;
    color: var(--color-accent);
    font-size: 0.9375rem;
}

.site-main ul li::before {
    content: '•';
    color: var(--color-text);
    font-weight: bold;
    display: inline-block;
    position: absolute;
    left: 0.5em;
}

/* --- Pillar Cards --- */
.pillars {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
    text-align: left;
}

.pillar {
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: var(--space-lg);
    transition: border-color var(--transition-fast);
}

.pillar:hover {
    border-color: var(--color-text-muted);
}

.pillar h3 {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.pillar p {
    font-size: 0.875rem;
    margin-bottom: 0;
}

/* --- CTA Button --- */
.cta-link {
    display: inline-block;
    border: 1px solid var(--color-text-muted);
    border-radius: 4px;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
    margin-top: var(--space-lg);
}

.cta-link:hover {
    border-color: var(--color-text);
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--color-text);
}

/* --- Image --- */
.content-image {
    max-width: 280px;
    border-radius: 4px;
    border: 1px solid var(--color-border);
}

/* --- Founder Attribution --- */
.attribution {
    font-size: 0.75rem;
    color: var(--color-text-subtle);
    margin-top: var(--space-md);
}

/* --- Footer --- */
.site-footer {
    width: 100%;
    max-width: var(--max-width-wide);
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--space-3xl);
    margin-bottom: var(--space-xl);
}

.footer-links {
    margin-bottom: var(--space-md);
}

.footer-links a {
    margin: 0 var(--space-sm);
}

.social-icon {
    display: inline-block;
    padding: var(--space-sm);
    border: 1px solid var(--color-text-muted);
    border-radius: var(--space-xs);
    margin: 0 var(--space-sm);
    font-family: var(--font-body);
    font-size: 0.75rem;
    transition: border-color var(--transition-fast);
}

.social-icon:hover {
    border-color: var(--color-text);
}

.copyright {
    margin-top: var(--space-md);
}

/* --- MailerLite Form Container --- */
.form-container {
    width: 100%;
    max-width: var(--max-width-content);
    margin: 0 auto;
}

/* --- Responsive --- */
@media (min-width: 640px) {
    .pillars {
        grid-template-columns: 1fr 1fr 1fr;
    }

    p {
        font-size: 1rem;
    }
}