/* =============================================================
   NORTHFIELD ADVISORY — styles.css
   Completely standalone. No dependency on SiteFolk or Tailwind.
   ============================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ---------- CSS CUSTOM PROPERTIES ---------- */
:root {
    /* Palette */
    --nf-bg-color:      #fdfdfc;
    --nf-white:         #ffffff;
    --nf-light-grey:    #f2f3f1;
    --nf-border:        #e2e4df;
    
    --nf-text-primary:  #1d2630;
    --nf-text-secondary:#5a646e;
    
    --nf-navy:          #0e1b29;
    --nf-navy-light:    #15283c;
    
    --nf-accent:        #376e5d;
    --nf-accent-dark:   #2b574a;
    --nf-accent-light:  #e7f2ed;

    /* Typography */
    --nf-font-sans:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --nf-section-py:    6rem;
    --nf-container-px:  1.5rem;
    --nf-container-max: 1140px;

    /* Misc */
    --nf-radius:        4px;
    --nf-radius-lg:     8px;
    --nf-shadow:        0 4px 12px rgba(0,0,0,.03), 0 1px 3px rgba(0,0,0,.02);
    --nf-shadow-hover:  0 10px 30px rgba(0,0,0,.06), 0 4px 8px rgba(0,0,0,.03);
    --nf-transition:    .25s ease;
}


/* ---------- RESET / BASE ---------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--nf-font-sans);
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--nf-text-primary);
    background-color: var(--nf-bg-color);
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--nf-transition);
}

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--nf-navy);
    letter-spacing: -0.01em;
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
}

input, textarea, select, button {
    font: inherit;
}

::selection {
    background-color: var(--nf-accent);
    color: var(--nf-white);
}

/* ---------- LAYOUT ---------- */
.nf-container {
    width: 100%;
    max-width: var(--nf-container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--nf-container-px);
    padding-right: var(--nf-container-px);
}

/* ---------- BUTTONS ---------- */
.nf-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    font-weight: 500;
    font-size: .9375rem;
    line-height: 1;
    padding: .875rem 1.75rem;
    border-radius: var(--nf-radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color var(--nf-transition), color var(--nf-transition), border-color var(--nf-transition);
    white-space: nowrap;
    text-align: center;
}

.nf-btn--primary {
    background-color: var(--nf-navy);
    color: var(--nf-white);
    border-color: var(--nf-navy);
}

.nf-btn--primary:hover {
    background-color: var(--nf-accent);
    border-color: var(--nf-accent);
}

.nf-btn--outline {
    background-color: transparent;
    color: var(--nf-navy);
    border-color: var(--nf-border);
}

.nf-btn--outline:hover {
    background-color: var(--nf-light-grey);
    border-color: var(--nf-navy);
}

.nf-btn--link {
    padding: 0;
    color: var(--nf-accent);
    font-weight: 500;
    border-bottom: 1px solid transparent;
    border-radius: 0;
}

.nf-btn--link:hover {
    color: var(--nf-navy);
    border-color: var(--nf-navy);
}

/* ---------- EYEBROW ---------- */
.nf-eyebrow {
    font-size: .75rem;
    font-weight: 600;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--nf-accent);
    margin-bottom: 1rem;
    display: block;
}

/* ---------- SECTION HEADER ---------- */
.nf-section-header {
    margin-bottom: 4rem;
}

.nf-section-header h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    margin-bottom: 1rem;
    max-width: 800px;
}

.nf-section-header p {
    font-size: 1.125rem;
    color: var(--nf-text-secondary);
    max-width: 700px;
}

/* =============================================================
   HEADER
   ============================================================= */
.nf-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(253, 253, 252, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--nf-border);
    transition: background-color .3s, box-shadow .3s;
}

.nf-header--scrolled {
    box-shadow: 0 4px 24px rgba(0,0,0,0.03);
}

.nf-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

/* Logo */
.nf-logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    line-height: 1;
    flex-shrink: 0;
}

.nf-logo__name {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    color: var(--nf-navy);
}

.nf-logo__tagline {
    font-weight: 500;
    font-size: .625rem;
    letter-spacing: .05em;
    color: var(--nf-text-secondary);
    margin-top: 2px;
}

/* Desktop nav */
.nf-nav {
    display: none;
}

.nf-nav__list {
    display: flex;
    gap: 2.5rem;
}

.nf-nav__list a {
    font-size: .9375rem;
    font-weight: 500;
    color: var(--nf-text-secondary);
    transition: color var(--nf-transition);
}

.nf-nav__list a:hover {
    color: var(--nf-navy);
}

/* Header actions */
.nf-header__actions {
    display: none;
}

/* Hamburger */
.nf-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 44px;
    height: 44px;
    padding: 8px;
}

.nf-hamburger__line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--nf-navy);
    border-radius: 1px;
    transition: transform .3s, opacity .3s;
}

.nf-hamburger[aria-expanded="true"] .nf-hamburger__line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.nf-hamburger[aria-expanded="true"] .nf-hamburger__line:nth-child(2) {
    opacity: 0;
}
.nf-hamburger[aria-expanded="true"] .nf-hamburger__line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile nav overlay */
.nf-nav--mobile-open {
    display: flex;
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    height: calc(100vh - 80px);
    background-color: var(--nf-bg-color);
    flex-direction: column;
    padding: 2rem var(--nf-container-px);
    z-index: 99;
    animation: nf-fade .25s ease-out;
}

@keyframes nf-fade {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.nf-nav--mobile-open .nf-nav__list {
    flex-direction: column;
    gap: 0;
}

.nf-nav--mobile-open .nf-nav__list a {
    display: block;
    font-size: 1.25rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--nf-border);
    color: var(--nf-navy);
}

/* =============================================================
   HERO
   ============================================================= */
.nf-hero {
    padding-top: 120px;
    padding-bottom: 4rem;
    background-color: var(--nf-bg-color);
}

.nf-hero__inner {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.nf-hero__content {
    max-width: 640px;
}

.nf-hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 600;
    color: var(--nf-navy);
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.nf-hero__desc {
    font-size: clamp(1.125rem, 3vw, 1.375rem);
    color: var(--nf-text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.5;
}

.nf-hero__ctas {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.nf-hero__media {
    width: 100%;
}

.nf-hero__img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--nf-radius-lg);
    box-shadow: var(--nf-shadow);
}


/* =============================================================
   TRUST
   ============================================================= */
.nf-trust {
    padding: 3rem 0;
    border-top: 1px solid var(--nf-border);
    border-bottom: 1px solid var(--nf-border);
    background-color: var(--nf-white);
}

.nf-trust__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.nf-trust__item {
    display: flex;
    flex-direction: column;
    gap: .25rem;
}

.nf-trust__value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--nf-navy);
}

.nf-trust__label {
    font-size: .875rem;
    color: var(--nf-text-secondary);
}


/* =============================================================
   SERVICES
   ============================================================= */
.nf-services {
    padding: var(--nf-section-py) 0;
    background-color: var(--nf-bg-color);
}

.nf-services__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.nf-service-card {
    background-color: var(--nf-white);
    border: 1px solid var(--nf-border);
    border-radius: var(--nf-radius);
    padding: 2.5rem 2rem;
    transition: box-shadow var(--nf-transition), transform var(--nf-transition);
}

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

.nf-service-card__icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--nf-light-grey);
    color: var(--nf-navy);
    border-radius: var(--nf-radius);
    margin-bottom: 1.5rem;
}

.nf-service-card h3 {
    font-size: 1.25rem;
    margin-bottom: .75rem;
}

.nf-service-card p {
    color: var(--nf-text-secondary);
    font-size: 1rem;
}


/* =============================================================
   ABOUT
   ============================================================= */
.nf-about {
    padding: var(--nf-section-py) 0;
    background-color: var(--nf-white);
}

.nf-about__inner {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.nf-about__content h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    margin-bottom: 1.5rem;
    max-width: 500px;
}

.nf-about__content p {
    color: var(--nf-text-secondary);
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    max-width: 540px;
}

.nf-about__img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--nf-radius-lg);
}


/* =============================================================
   WHY NORTHFIELD
   ============================================================= */
.nf-why {
    padding: var(--nf-section-py) 0;
    background-color: var(--nf-light-grey);
}

.nf-why__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.nf-principle {
    background-color: var(--nf-bg-color);
    padding: 2.5rem;
    border-radius: var(--nf-radius);
    border: 1px solid var(--nf-border);
}

.nf-principle h3 {
    font-size: 1.25rem;
    margin-bottom: .75rem;
    color: var(--nf-accent);
}

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


/* =============================================================
   INDUSTRIES
   ============================================================= */
.nf-industries {
    padding: var(--nf-section-py) 0;
    background-color: var(--nf-white);
}

.nf-industries__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.nf-industry {
    padding: 1.5rem;
    border: 1px solid var(--nf-border);
    border-radius: var(--nf-radius);
    text-align: center;
    font-weight: 500;
    color: var(--nf-navy);
    transition: background-color var(--nf-transition), border-color var(--nf-transition);
}

.nf-industry:hover {
    background-color: var(--nf-light-grey);
    border-color: var(--nf-text-secondary);
}


/* =============================================================
   INSIGHTS
   ============================================================= */
.nf-insights {
    padding: var(--nf-section-py) 0;
    background-color: var(--nf-bg-color);
    border-top: 1px solid var(--nf-border);
}

.nf-insights__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.nf-article {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--nf-border);
}

.nf-article__meta {
    font-size: .8125rem;
    font-weight: 600;
    color: var(--nf-accent);
    text-transform: uppercase;
    letter-spacing: .05em;
}

.nf-article__title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--nf-navy);
}

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

.nf-article__link {
    font-weight: 500;
    color: var(--nf-navy);
    display: inline-flex;
    align-items: center;
    gap: .5rem;
}

.nf-article__link:hover {
    color: var(--nf-accent);
}


/* =============================================================
   TESTIMONIALS
   ============================================================= */
.nf-testimonials {
    padding: var(--nf-section-py) 0;
    background-color: var(--nf-navy);
    color: var(--nf-white);
}

.nf-testimonials .nf-section-header h2,
.nf-testimonials .nf-section-header p {
    color: var(--nf-white);
}

.nf-testimonials .nf-section-header p {
    opacity: 0.8;
}

.nf-testimonials__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.nf-testimonial {
    padding: 2.5rem;
    background-color: var(--nf-navy-light);
    border-radius: var(--nf-radius);
}

.nf-testimonial__quote {
    font-size: 1.125rem;
    font-style: italic;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.nf-testimonial__author {
    font-size: .875rem;
    color: rgba(255,255,255,.7);
}

.nf-testimonial__author strong {
    color: var(--nf-white);
    display: block;
    margin-bottom: .25rem;
}


/* =============================================================
   FAQ
   ============================================================= */
.nf-faq {
    padding: var(--nf-section-py) 0;
    background-color: var(--nf-white);
}

.nf-faq__list {
    max-width: 800px;
    margin: 0 auto;
}

.nf-faq__item {
    border-bottom: 1px solid var(--nf-border);
}

.nf-faq__item summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    font-size: 1.125rem;
    color: var(--nf-navy);
    padding: 1.5rem 0;
    cursor: pointer;
    list-style: none;
    transition: color var(--nf-transition);
}

.nf-faq__item summary::-webkit-details-marker {
    display: none;
}

.nf-faq__icon {
    position: relative;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    margin-left: 1rem;
}

.nf-faq__icon::before,
.nf-faq__icon::after {
    content: '';
    position: absolute;
    background-color: var(--nf-navy);
    transition: transform .3s;
}

.nf-faq__icon::before {
    top: 11px;
    left: 4px;
    right: 4px;
    height: 2px;
}

.nf-faq__icon::after {
    top: 4px;
    bottom: 4px;
    left: 11px;
    width: 2px;
}

.nf-faq__item[open] .nf-faq__icon::after {
    transform: rotate(90deg);
}

.nf-faq__content {
    padding-bottom: 1.5rem;
    color: var(--nf-text-secondary);
}


/* =============================================================
   FINAL CTA
   ============================================================= */
.nf-cta {
    padding: var(--nf-section-py) 0;
    background-color: var(--nf-light-grey);
    text-align: center;
}

.nf-cta__inner {
    max-width: 640px;
    margin: 0 auto;
}

.nf-cta h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    margin-bottom: 1rem;
}

.nf-cta p {
    font-size: 1.125rem;
    color: var(--nf-text-secondary);
    margin-bottom: 2rem;
}

.nf-cta__buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}


/* =============================================================
   FOOTER
   ============================================================= */
.nf-footer {
    background-color: var(--nf-white);
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--nf-border);
}

.nf-footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

.nf-footer__brand {
    max-width: 300px;
}

.nf-footer__brand .nf-logo {
    margin-bottom: 1.5rem;
}

.nf-footer__col h4 {
    font-size: .875rem;
    font-weight: 600;
    color: var(--nf-navy);
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: .05em;
}

.nf-footer__col ul {
    display: flex;
    flex-direction: column;
    gap: .75rem;
}

.nf-footer__col a {
    color: var(--nf-text-secondary);
    font-size: .9375rem;
}

.nf-footer__col a:hover {
    color: var(--nf-navy);
}

.nf-footer__col p {
    color: var(--nf-text-secondary);
    font-size: .9375rem;
    margin-bottom: .5rem;
}

.nf-footer__bottom {
    border-top: 1px solid var(--nf-border);
    padding-top: 2rem;
    text-align: center;
    font-size: .8125rem;
    color: var(--nf-text-secondary);
}


/* =============================================================
   MEDIA QUERIES
   ============================================================= */
@media (min-width: 768px) {
    .nf-hero__inner {
        flex-direction: row;
        align-items: center;
    }
    .nf-hero__content {
        flex: 1;
    }
    .nf-hero__media {
        flex: 1;
    }
    .nf-hero__img {
        height: 500px;
    }

    .nf-trust__grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .nf-trust__item {
        border-right: 1px solid var(--nf-border);
        padding: 0 1rem;
    }
    .nf-trust__item:last-child {
        border-right: none;
    }

    .nf-services__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .nf-about__inner {
        flex-direction: row;
        align-items: center;
        gap: 4rem;
    }
    .nf-about__img-wrapper {
        flex: 1;
    }
    .nf-about__content {
        flex: 1;
    }

    .nf-why__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .nf-industries__grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .nf-insights__grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .nf-article {
        border-bottom: none;
        padding-bottom: 0;
    }

    .nf-testimonials__grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .nf-footer__grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
    .nf-footer__bottom {
        text-align: left;
    }
}

@media (min-width: 1024px) {
    .nf-hamburger {
        display: none;
    }
    .nf-nav, .nf-header__actions {
        display: flex;
    }
    .nf-hero {
        padding-top: 160px;
        padding-bottom: 6rem;
    }
    .nf-hero__img {
        height: 600px;
    }
}