/* ==================================================================
   FACTYN — stylesheet
   ------------------------------------------------------------------
   Display type : Spectral   (serif — carries the brand)
   Body type    : Geist      (grotesk — quiet, supporting)
   Palette      : black / warm off-white / greys — no accent colour
   Rhythm       : the page breathes between dark and light sections

   Structure
     1.  Fonts
     2.  Tokens (:root)
     3.  Reset & base
     4.  Layout shell
     5.  Header & language switch
     6.  Hero          (home only)
     7.  Page header   (inner pages)
     8.  Sections & headings
     9.  Layers (Truth / Style)
    10.  Definition rows
    11.  Audience list
    12.  Contrast rows
    13.  Links & CTA
    14.  Contact line
    15.  Footer
    16.  Responsive
    17.  Entrance animation
   ================================================================== */

/* 1. FONTS ========================================================= */

@import url("https://fonts.googleapis.com/css2?family=Spectral:ital,wght@0,300;0,400;0,500;1,300;1,400&display=swap");

@font-face {
    font-family: "FactynSans";
    font-weight: 400;
    font-display: swap;
    src: url("https://cdn.jsdelivr.net/npm/geist@1.3.1/dist/fonts/geist-sans/Geist-Regular.woff2")
        format("woff2");
}
@font-face {
    font-family: "FactynSans";
    font-weight: 500;
    font-display: swap;
    src: url("https://cdn.jsdelivr.net/npm/geist@1.3.1/dist/fonts/geist-sans/Geist-Medium.woff2")
        format("woff2");
}

/* 2. TOKENS ======================================================== */

:root {
    /* dark (default) */
    --black: #16161a;
    --ash: #9a9a9f; /* secondary text on dark   */
    --ash-dim: #6b6b70; /* tertiary on dark         */
    --line: #2c2c32; /* hairline on dark         */

    /* light section */
    --paper: #f4f3f0; /* warm off-white           */
    --ink: #16161a;
    --ink-soft: #55555b;
    --ink-dim: #8a8a8f;
    --line-light: #d9d8d3;

    /* type */
    --serif: "Spectral", Georgia, serif;
    --sans: "FactynSans", system-ui, sans-serif;

    /* metrics */
    --measure: 38rem;
    --shell: 60rem;
    --pad: clamp(1.5rem, 5vw, 3.5rem);
    --gap: clamp(7rem, 13vw, 12rem);
}

/* 3. RESET & BASE ================================================== */

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--sans);
    font-weight: 400;
    font-size: 1.0625rem;
    line-height: 1.72;
    color: var(--ash);
    background: var(--black);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* 4. LAYOUT SHELL ================================================== */

.wrap {
    max-width: var(--shell);
    margin: 0 auto;
    padding: 0 var(--pad);
}

/* 5. HEADER & LANGUAGE SWITCH ====================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--black);
    border-bottom: 1px solid var(--line);
}

.site-header__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.6rem 0;
}

.wordmark {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.45rem;
    letter-spacing: 0.01em;
    color: var(--paper);
    text-decoration: none;
}

.nav-group {
    display: flex;
    align-items: center;
    gap: 2.25rem;
}

.site-nav {
    display: flex;
    gap: 2.25rem;
}
.site-nav a {
    font-family: var(--sans);
    font-size: 0.9375rem;
    color: var(--ash);
    text-decoration: none;
    transition: color 0.15s ease;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
    color: var(--paper);
}

/* language switch — set apart from the page nav, lighter */
.lang-switch {
    font-family: var(--sans);
    font-size: 0.8125rem;
    letter-spacing: 0.06em;
    color: var(--ash-dim);
    text-decoration: none;
    padding-left: 2.25rem;
    border-left: 1px solid var(--line);
    transition: color 0.15s ease;
}
.lang-switch:hover {
    color: var(--paper);
}

/* 6. HERO  (home only) ============================================= */

.hero {
    padding: clamp(7rem, 16vw, 13rem) 0 clamp(6.5rem, 14vw, 11rem);
}
.hero__tagline {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 400;
    font-size: 1.3rem;
    color: var(--ash);
    margin-bottom: 2.5rem;
}
.hero h1 {
    font-family: var(--serif);
    font-weight: 300;
    font-size: clamp(2.9rem, 7.5vw, 5.5rem);
    line-height: 1.05;
    letter-spacing: -0.018em;
    color: var(--paper);
    max-width: 15ch;
    margin-bottom: 2.5rem;
}
.hero__sub {
    font-family: var(--sans);
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--ash);
    max-width: var(--measure);
}

/* 7. PAGE HEADER  (inner pages) ==================================== */

.page-header {
    padding: clamp(5rem, 11vw, 9rem) 0 clamp(3.5rem, 7vw, 5.5rem);
}
.page-header__kicker {
    font-family: var(--sans);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ash-dim);
    margin-bottom: 1.5rem;
}
.page-header h1 {
    font-family: var(--serif);
    font-weight: 300;
    font-size: clamp(2.4rem, 6vw, 4rem);
    line-height: 1.1;
    letter-spacing: -0.015em;
    color: var(--paper);
    max-width: 18ch;
}

/* 8. SECTIONS & HEADINGS =========================================== */

.section {
    padding: var(--gap) 0;
}

/* first section after a page header sits closer to it */
.page-header + .section {
    padding-top: clamp(2rem, 4vw, 3.5rem);
}

/* dark is default; --light inverts to the warm paper */
.section--light {
    background: var(--paper);
    color: var(--ink-soft);
}

.eyebrow {
    font-family: var(--sans);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ash-dim);
    padding-bottom: 1rem;
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--line);
}
.section--light .eyebrow {
    color: var(--ink-dim);
    border-color: var(--line-light);
}

h2 {
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(1.8rem, 3.4vw, 2.5rem);
    line-height: 1.22;
    letter-spacing: -0.008em;
    color: var(--paper);
    max-width: 20ch;
    margin-bottom: 1.75rem;
}
.section--light h2 {
    color: var(--ink);
}

.lede {
    font-family: var(--sans);
    max-width: var(--measure);
    color: var(--ash);
    margin-bottom: 1.35rem;
}
.lede:last-child {
    margin-bottom: 0;
}
.lede strong {
    color: var(--paper);
    font-weight: 500;
}
.section--light .lede {
    color: var(--ink-soft);
}
.section--light .lede strong {
    color: var(--ink);
}

/* spacing modifier — replaces former inline margin-top overrides */
.lede--spaced {
    margin-top: 2.5rem;
}

/* large serif statement — typography as image, distinct from h2 */
.statement {
    font-family: var(--serif);
    font-weight: 300;
    font-size: clamp(1.9rem, 3.8vw, 2.8rem);
    line-height: 1.36;
    color: var(--paper);
    max-width: 26rem;
    margin-top: 3rem;
}
.statement--lead {
    /* opening statement directly under a page header */
    margin-top: 0;
    max-width: 34rem;
}
.section--light .statement {
    color: var(--ink);
}

/* 9. LAYERS  (Truth / Style) ======================================= */

.layers {
    margin-top: 3.5rem;
}
.layer {
    padding: 2.75rem 0;
    border-top: 1px solid var(--line);
}
.layer:last-child {
    border-bottom: 1px solid var(--line);
}
.section--light .layer {
    border-color: var(--line-light);
}

.layer__name {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.5rem;
    color: var(--paper);
    margin-bottom: 0.35rem;
}
.section--light .layer__name {
    color: var(--ink);
}

.layer__role {
    font-family: var(--sans);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--ash-dim);
    margin-bottom: 1.35rem;
}
.layer p {
    font-family: var(--sans);
    color: var(--ash);
    max-width: var(--measure);
    margin-bottom: 1rem;
}
.layer p:last-child {
    margin-bottom: 0;
}
.section--light .layer p {
    color: var(--ink-soft);
}

/* 10. DEFINITION ROWS ============================================== */

.defs {
    margin-top: 2.5rem;
}
.def {
    display: grid;
    grid-template-columns: 14rem 1fr;
    gap: 0.3rem 2rem;
    padding: 1.6rem 0;
    border-top: 1px solid var(--line);
}
.def:last-child {
    border-bottom: 1px solid var(--line);
}
.section--light .def {
    border-color: var(--line-light);
}

.def__term {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.1rem;
    color: var(--paper);
}
.section--light .def__term {
    color: var(--ink);
}

.def__desc {
    font-family: var(--sans);
    color: var(--ash);
    max-width: var(--measure);
}
.section--light .def__desc {
    color: var(--ink-soft);
}

/* 11. AUDIENCE LIST ================================================ */

.audience {
    margin-top: 3rem;
}
.audience li {
    list-style: none;
    font-family: var(--serif);
    font-size: clamp(1.3rem, 2.4vw, 1.65rem);
    color: var(--ink);
    padding: 1.35rem 0;
    border-bottom: 1px solid var(--line-light);
}
.audience li:first-child {
    border-top: 1px solid var(--line-light);
}

/* 12. CONTRAST ROWS  (what Factyn is not) ========================== */

.contrasts {
    margin-top: 2.5rem;
}
.contrast {
    padding: 1.6rem 0;
    border-top: 1px solid var(--line);
    font-family: var(--serif);
    font-size: 1.2rem;
    line-height: 1.5;
    color: var(--paper);
    max-width: 42rem;
}
.contrast:last-child {
    border-bottom: 1px solid var(--line);
}
.contrast .not {
    color: var(--ash-dim);
}

/* 13. LINKS & CTA ================================================== */

.cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 3rem;
    font-family: var(--sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--paper);
    text-decoration: none;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--ash-dim);
    transition:
        gap 0.15s ease,
        border-color 0.15s ease;
}
.cta:hover {
    gap: 0.85rem;
    border-color: var(--paper);
}
.section--light .cta {
    color: var(--ink);
    border-color: var(--ink-dim);
}
.section--light .cta:hover {
    border-color: var(--ink);
}

/* 14. CONTACT LINE ================================================= */

.contact-line {
    margin-top: 2.5rem;
}
.contact-line a {
    font-family: var(--serif);
    font-size: 1.7rem;
    color: var(--paper);
    text-decoration: none;
    border-bottom: 1px solid var(--ash-dim);
    transition: border-color 0.15s ease;
}
.contact-line a:hover {
    border-color: var(--paper);
}

/* 15. FOOTER ======================================================= */

.site-footer {
    border-top: 1px solid var(--line);
    padding: 3.25rem 0;
}
.site-footer__row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.5rem;
    justify-content: space-between;
    font-family: var(--sans);
    font-size: 0.9375rem;
    color: var(--ash-dim);
}
.site-footer__nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}
.site-footer__nav a,
.site-footer__row a {
    color: var(--ash-dim);
    text-decoration: none;
    transition: color 0.15s ease;
}
.site-footer__nav a:hover {
    color: var(--paper);
}

/* 16. RESPONSIVE =================================================== */

@media (max-width: 40rem) {
    .def {
        grid-template-columns: 1fr;
    }
    .def__desc {
        margin-top: 0.3rem;
    }

    /* header — wordmark and nav stack rather than crowd */
    .site-header__bar {
        flex-wrap: wrap;
        gap: 0.75rem 0;
        padding: 1.1rem 0;
    }
    .nav-group {
        width: 100%;
        gap: 1.4rem;
        justify-content: space-between;
    }
    .site-nav {
        gap: 1.4rem;
    }
    .site-nav a {
        font-size: 0.875rem;
    }
    .lang-switch {
        padding-left: 1.4rem;
    }

    /* hero — pull oversized type and padding in on phones */
    .hero {
        padding: clamp(3.5rem, 14vw, 5rem) 0 clamp(3rem, 12vw, 4rem);
    }
    .hero__tagline {
        font-size: 1.15rem;
        margin-bottom: 1.75rem;
    }
    .hero__sub {
        font-size: 1.1rem;
    }

    /* footer — stack the two rows */
    .site-footer__row {
        flex-direction: column;
        gap: 1.25rem;
    }

    /* contact line — keep the big serif address from overflowing */
    .contact-line a {
        font-size: 1.35rem;
        word-break: break-word;
    }
}

/* 17. ENTRANCE ANIMATION =========================================== */

@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(14px);
        animation: rise 0.8s cubic-bezier(0.2, 0.6, 0.2, 1) forwards;
    }
    .reveal:nth-child(1) {
        animation-delay: 0.05s;
    }
    .reveal:nth-child(2) {
        animation-delay: 0.16s;
    }
    .reveal:nth-child(3) {
        animation-delay: 0.27s;
    }

    @keyframes rise {
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}