/* =============================================================================
   ENV Water Chemistry Solutions — Global Styles
   -----------------------------------------------------------------------------
   Imports the canonical design system tokens (colors, type, spacing, easing)
   from tokens.css — that file mirrors Design System/colors_and_type.css.
   This file owns: reset, global nav, global footer, generic page scaffold,
   prose styling, buttons, utilities.
   Page-specific layouts live in homepage.css / blog.css / subpage.css.
   ============================================================================= */

@import url("tokens.css");

/* -------- Local scaffolding tokens (spacing + layout only) ----------------- */
:root {
    --s-1: 0.25rem;
    --s-2: 0.5rem;
    --s-3: 0.75rem;
    --s-4: 1rem;
    --s-5: 1.5rem;
    --s-6: 2rem;
    --s-7: 3rem;
    --s-8: 4rem;
    --s-9: 6rem;

    --nav-h: 96px;
    --content-max: 1200px;
    --prose-max: 720px;
}

/* -------- Reset ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }

body {
    font-family: var(--font-sans);
    background-color: var(--surface-base);
    color: var(--fg-1);
    line-height: var(--body-lh);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* -------- Top Nav (global) ------------------------------------------------- */
.site-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-h);
    z-index: 100;
    background: rgba(2, 6, 23, 0.75);
    backdrop-filter: var(--blur-strong);
    -webkit-backdrop-filter: var(--blur-strong);
    border-bottom: 1px solid var(--overlay-border-weak);
    display: flex;
    align-items: center;
    padding: 0 var(--s-6);
}
.site-nav__inner {
    width: 100%;
    max-width: var(--content-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s-5);
}
/* Brand is now the env-stacked logo image. Text is preserved in the DOM
   for screen readers + SEO but visually replaced by the logo. */
.site-nav__brand {
    display: inline-block;
    width: 188px;
    height: 80px;
    text-indent: -9999px;
    overflow: hidden;
    background-image: url("../images/logos/env-logo.png");
    background-repeat: no-repeat;
    background-position: left center;
    background-size: contain;
    color: transparent;
    flex-shrink: 0;
}
.site-nav__links {
    display: flex;
    gap: 0;
    list-style: none;
    padding: 0; margin: 0;
}
.site-nav__links a {
    position: relative;
    display: inline-block;
    padding: 0 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--fg-3);
    line-height: var(--nav-h);
    letter-spacing: 0.01em;
    transition: color var(--duration-fast) var(--ease-standard);
}
.site-nav__links a:hover { color: var(--fg-1); }
.site-nav__links a[aria-current="page"] {
    color: var(--fg-1);
}
.site-nav__links a[aria-current="page"]::after {
    content: "";
    position: absolute;
    left: 1.5rem;
    right: 1.5rem;
    bottom: 12px;
    height: 2px;
    background: var(--brand-blue-light);
}

/* Mobile nav */
.site-nav__toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--overlay-border-strong);
    color: var(--fg-1);
    padding: var(--s-2) var(--s-3);
    border-radius: var(--radius-xs);
    font-size: var(--body-sm-size);
}

@media (max-width: 768px) {
    .site-nav { padding: 0 var(--s-4); height: 72px; }
    .site-nav__brand { width: 132px; height: 56px; }
    .site-nav__toggle { display: inline-flex; }
    .site-nav__links {
        position: fixed;
        top: 72px;
        left: 0; right: 0;
        background: var(--surface-base);
        flex-direction: column;
        border-bottom: 1px solid var(--overlay-border-weak);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--duration-base) var(--ease-standard);
    }
    .site-nav__links.is-open { max-height: 80vh; }
    .site-nav__links a {
        line-height: 1;
        padding: var(--s-4) var(--s-5);
        width: 100%;
        border-bottom: 1px solid var(--overlay-border-weak);
    }
}

/* -------- Global Footer ---------------------------------------------------- */
.site-footer {
    background: var(--surface-base);
    border-top: 1px solid var(--overlay-border-weak);
    padding: var(--s-8) var(--s-6) var(--s-6);
    margin-top: var(--s-9);
}
.site-footer__inner {
    max-width: var(--content-max);
    margin: 0 auto;
    display: grid;
    gap: var(--s-6);
}
.site-footer__logo {
    display: block;
    width: 220px;
    max-width: 60%;
    height: auto;
    margin-bottom: var(--s-5);
}
.site-footer__brand {
    /* Text hidden — the logo image (::before) already includes the wordmark.
       Kept in the DOM for screen readers and SEO. */
    font-size: 0;
    line-height: 0;
    color: transparent;
    margin: 0;
}
/* CSS-only logo injection — appears above the wordmark in every footer
   without needing to edit 40 HTML files. The ENV+droplet/leaf reads
   beautifully on dark navy; the wordmark text in the asset is dark gray
   so the typed wordmark below provides the legible name. */
.site-footer__brand::before {
    content: "";
    display: block;
    width: 240px;
    height: 120px;
    margin-bottom: var(--s-4);
    background-image: url("../images/logos/env-logo.png");
    background-repeat: no-repeat;
    background-position: left center;
    background-size: contain;
}
.site-footer__tagline {
    color: var(--fg-3);
    font-size: 0.95rem;
    max-width: 540px;
    line-height: 1.6;
    margin-top: 0;
}
.site-footer__nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--s-6);
    list-style: none;
    padding: 0; margin: 0;
}
.site-footer__nav a {
    color: var(--fg-3);
    font-size: 0.9rem;
    transition: color var(--duration-fast) var(--ease-standard);
}
.site-footer__nav a:hover { color: var(--fg-1); }
.site-footer__cwh {
    color: var(--fg-4);
    font-size: 0.85rem;
    line-height: 1.6;
    border-top: 1px solid var(--overlay-border-weak);
    padding-top: var(--s-6);
    display: flex;
    align-items: center;
    gap: var(--s-5);
    flex-wrap: wrap;
}
.site-footer__cwh-text {
    margin: 0;
    flex: 1 1 420px;
    max-width: 700px;
}
.site-footer__cwh-logo {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    transition: opacity var(--duration-fast) var(--ease-standard);
}
.site-footer__cwh-logo:hover { opacity: 0.85; }
.site-footer__cwh-logo img {
    height: 72px;
    width: auto;
    display: block;
}
.site-footer__copy {
    color: var(--fg-6);
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* -------- Generic page scaffold (used by non-homepage pages) --------------- */
.page {
    padding-top: var(--nav-h);
    min-height: 100vh;
}
.page__hero {
    padding: var(--s-9) var(--s-6) var(--s-7);
    background:
      linear-gradient(180deg, rgba(2,6,23,0.4), rgba(2,6,23,0.9)),
      var(--surface-base);
    border-bottom: 1px solid var(--overlay-border-weak);
}
/* Photographic hero variant — set the image via inline background-image. */
.page__hero--photo {
    background-size: cover;
    background-position: center;
    padding-top: calc(var(--s-9) + var(--s-7));
}
.page__hero--photo .page__title { text-shadow: var(--shadow-text-hero); }
.page__hero--photo .page__lede { text-shadow: 0 2px 12px rgba(0,0,0,0.6); }
.page__hero-inner {
    max-width: var(--content-max);
    margin: 0 auto;
}
.page__eyebrow {
    color: var(--fg-4);
    font-size: var(--label-size);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: var(--label-weight);
    margin-bottom: var(--s-3);
}
.page__title {
    font-size: clamp(2rem, 4vw, var(--display-1-size));
    font-weight: var(--display-1-weight);
    line-height: var(--display-1-lh);
    letter-spacing: var(--display-1-tracking);
    margin: 0 0 var(--s-4);
    color: var(--fg-1);
}
.page__lede {
    font-size: 1.1rem;
    color: var(--fg-3);
    max-width: 720px;
    line-height: 1.6;
}

.page__section {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: var(--s-8) var(--s-6);
}
.page__section--prose {
    max-width: calc(var(--prose-max) + var(--s-6) * 2);
}

/* -------- Prose styling (used in About, Insight bodies) -------------------- */
.prose {
    color: var(--fg-3);
    font-size: var(--body-lg-size);
    line-height: var(--body-lg-lh);
}
.prose h2 {
    color: var(--fg-1);
    font-size: 1.8rem;
    font-weight: 700;
    margin: var(--s-8) 0 var(--s-4);
    letter-spacing: -0.01em;
}
.prose h3 {
    color: var(--fg-1);
    font-size: var(--h3-size);
    font-weight: var(--h3-weight);
    margin: var(--s-6) 0 var(--s-3);
}
.prose h4 {
    color: var(--fg-1);
    font-size: var(--h4-size);
    font-weight: var(--h4-weight);
    margin: var(--s-5) 0 var(--s-3);
}
.prose p { margin: 0 0 1.25rem; text-wrap: pretty; }
.prose strong { color: var(--fg-2); font-weight: 600; }
.prose em { font-style: italic; }
.prose a {
    color: var(--brand-blue-light);
    border-bottom: 1px solid rgba(59, 130, 246, 0.4);
    transition: color var(--duration-fast) var(--ease-standard),
                border-color var(--duration-fast) var(--ease-standard);
}
.prose a:hover { color: var(--fg-1); border-bottom-color: var(--fg-1); }
.prose ul, .prose ol {
    margin: 0 0 var(--s-4);
    padding-left: var(--s-5);
}
.prose li { margin-bottom: var(--s-2); }
.prose blockquote {
    border-left: 3px solid var(--brand-blue-light);
    padding: var(--s-2) 0 var(--s-2) var(--s-5);
    margin: var(--s-5) 0;
    color: var(--fg-3);
    font-style: italic;
}
.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--s-5) 0;
    font-size: 0.95rem;
}
.prose th, .prose td {
    text-align: left;
    padding: var(--s-3) var(--s-4);
    border-bottom: 1px solid var(--overlay-border-weak);
}
.prose th {
    color: var(--fg-1);
    font-weight: 600;
    background: var(--overlay-weak);
}
.prose code {
    background: var(--overlay-weak);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: var(--font-mono);
}

/* -------- Buttons ---------------------------------------------------------- */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-weight: 600;
    font-size: 1rem;
    font-family: inherit;
    border-radius: var(--radius-md);
    transition: transform var(--duration-base) var(--ease-standard),
                box-shadow var(--duration-base) var(--ease-standard),
                background var(--duration-fast) var(--ease-standard);
    border: none;
    text-align: center;
}
/* Primary CTA: the gradient + pill — the brand's "one piece of jewelry". */
.btn--primary {
    background: linear-gradient(135deg, var(--brand-blue), var(--brand-blue-deep));
    color: var(--fg-1);
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-cta);
}
.btn--primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-cta-hover);
    color: var(--fg-1);
}
.btn--ghost {
    background: transparent;
    color: var(--fg-3);
    border: 1px solid rgba(148, 163, 184, 0.30);
}
.btn--ghost:hover {
    color: var(--fg-1);
    border-color: rgba(148, 163, 184, 0.5);
    background: var(--overlay-weak);
}

/* -------- Utility ---------------------------------------------------------- */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}

.eyebrow {
    font-size: var(--label-size);
    font-weight: var(--label-weight);
    letter-spacing: var(--label-tracking);
    text-transform: var(--label-transform);
    color: var(--fg-5);
}

/* =============================================================================
   Responsive refinements (laptop / tablet / mobile)
   ============================================================================= */

/* Tablet & small laptop: tighten nav so 5 links + logo never collide */
@media (max-width: 1024px) and (min-width: 769px) {
    .site-nav__links a { padding: 0 1.05rem; font-size: 0.95rem; }
    .site-nav__brand { width: 168px; }
}

/* Long-form prose: keep wide comparison tables usable on phones */
@media (max-width: 640px) {
    .prose table {
        display: block;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
    }
    .prose h2 { font-size: 1.5rem; }
    .page__section { padding: var(--s-6) var(--s-4); }
}

/* Footer: stack the CWH row cleanly on small screens */
@media (max-width: 640px) {
    .site-footer { padding: var(--s-7) var(--s-4) var(--s-5); }
    .site-footer__cwh { gap: var(--s-3); }
    .site-footer__brand::before { width: 200px; height: 92px; }
}

/* -------- Brand-blue compact page hero (About / Innovation / Insights) ---- */
.page__hero--brand {
    background:
      linear-gradient(135deg, rgba(37, 99, 235, 0.28), rgba(37, 99, 235, 0.10)),
      var(--surface-elevated);
    border-bottom: 1px solid var(--overlay-border-weak);
    padding: var(--s-6) var(--s-6) var(--s-5);
}
.page__hero--brand .page__eyebrow { color: rgba(255,255,255,0.82); }
.page__hero--brand .page__title { color: #ffffff; text-shadow: none; }
.page__hero--brand .page__lede { color: rgba(255,255,255,0.92); text-shadow: none; }
@media (max-width: 640px) {
    .page__hero--brand { padding: var(--s-5) var(--s-4) var(--s-4); }
}

/* -------- Floating "Discuss Your Project" + CWH (injected by main.js) ----- */
.float-cta {
    position: fixed;
    right: 1.25rem;
    bottom: 1.25rem;
    z-index: 200;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}
.float-cta__btn {
    display: inline-block;
    padding: 0.9rem 1.7rem;
    background: linear-gradient(135deg, var(--brand-blue), var(--brand-blue-deep));
    color: #fff;
    font-weight: 700;
    font-size: 0.95rem;
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-cta);
    white-space: nowrap;
    transition: transform var(--duration-base) var(--ease-standard),
                box-shadow var(--duration-base) var(--ease-standard);
}
.float-cta__btn:hover { transform: translateY(-3px); box-shadow: var(--shadow-cta-hover); color: #fff; }
.float-cta__cwh {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    text-decoration: none;
    opacity: 0.9;
    transition: opacity var(--duration-fast) var(--ease-standard);
}
.float-cta__cwh:hover { opacity: 1; }
.float-cta__cwh span {
    font-size: 0.62rem;
    font-weight: 700;
    color: var(--fg-2);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}
.float-cta__cwh img { height: 51px; width: auto; display: block; }
@media (max-width: 600px) {
    .float-cta { right: 0.75rem; bottom: 0.75rem; gap: 1.1rem; }
    .float-cta__btn { padding: 0.7rem 1.2rem; font-size: 0.82rem; }
    .float-cta__cwh img { height: 39px; }
    .float-cta__cwh span { font-size: 0.56rem; }
}