/* ==========================================================================
   Keystone Building Supply LLC — Core styles
   Design system: variables, base, layout, header, footer, mobile nav.
   ========================================================================== */

:root {
    /* Palette */
    --primary-navy: #102A43;
    --secondary-navy: #243B53;
    --construction-orange: #F28C28;
    --construction-orange-dark: #D96F12;
    --warm-sand: #E8D9C5;
    --surface-light: #F5F7FA;
    --white: #FFFFFF;
    --text-dark: #1F2933;
    --text-muted: #52606D;
    --success: #2E7D32;
    --danger: #C62828;
    --border: #D9E2EC;

    /* Typography */
    --font-sans: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
    --fs-xs: 0.8125rem;
    --fs-sm: 0.9375rem;
    --fs-base: 1rem;
    --fs-md: 1.125rem;
    --fs-lg: 1.375rem;
    --fs-xl: 1.75rem;
    --fs-2xl: 2.25rem;
    --fs-3xl: clamp(2rem, 4vw + 0.5rem, 3.25rem);
    --lh-tight: 1.2;
    --lh-base: 1.65;

    /* Layout */
    --container-max: 1320px;
    --container-narrow: 860px;
    --gutter: clamp(1rem, 3vw, 2rem);

    /* Radius / shadows */
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 18px;
    --radius-pill: 999px;
    --shadow-sm: 0 1px 2px rgba(16, 42, 67, 0.06), 0 1px 3px rgba(16, 42, 67, 0.08);
    --shadow: 0 6px 18px rgba(16, 42, 67, 0.08);
    --shadow-md: 0 12px 32px rgba(16, 42, 67, 0.12);
    --shadow-lg: 0 24px 60px rgba(16, 42, 67, 0.18);

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-7: 3rem;
    --space-8: 4rem;
    --section-y: clamp(3rem, 6vw, 5.5rem);

    /* Chrome */
    --header-height: 104px;
    --header-height-scrolled: 72px;
    --mobile-header-height: 64px;
    --mobile-nav-height: 62px;

    /* Motion */
    --transition: 0.2s ease;
    --transition-slow: 0.35s ease;
}

/* --- Reset / base ------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    line-height: var(--lh-base);
    color: var(--text-dark);
    background: var(--white);
    overflow-x: hidden;
}

body.has-mobile-nav { padding-bottom: 0; }

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

a { color: var(--construction-orange-dark); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-navy); }

h1, h2, h3, h4 { line-height: var(--lh-tight); color: var(--primary-navy); font-weight: 700; margin: 0 0 var(--space-4); }
p { margin: 0 0 var(--space-4); }
ul, ol { margin: 0 0 var(--space-4); }

:focus-visible {
    outline: 3px solid var(--construction-orange);
    outline-offset: 2px;
    border-radius: 3px;
}

/* --- Skip link ---------------------------------------------------------- */
.skip-link {
    position: absolute;
    left: 50%;
    top: -60px;
    transform: translateX(-50%);
    background: var(--primary-navy);
    color: var(--white);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    z-index: 2000;
    transition: top var(--transition);
}
.skip-link:focus { top: 8px; color: var(--white); }

/* --- Layout ------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(1.5rem, 4vw, 2.5rem); }
.section--surface { background: var(--surface-light); }
.section--navy { background: var(--primary-navy); color: rgba(255, 255, 255, 0.92); }

.section-head { margin-bottom: var(--space-6); display: flex; justify-content: space-between; align-items: flex-end; gap: var(--space-4); flex-wrap: wrap; }
.section-head--center { display: block; text-align: center; max-width: 760px; margin-inline: auto; }
.section-title { font-size: var(--fs-2xl); margin-bottom: var(--space-3); }
.section-title--light { color: var(--white); }
.section-lead { font-size: var(--fs-md); color: var(--text-muted); margin-bottom: 0; }
.section-lead--light { color: rgba(255, 255, 255, 0.85); }
.section-foot { margin-top: var(--space-6); text-align: center; }

.eyebrow {
    display: inline-block;
    font-size: var(--fs-xs);
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--construction-orange-dark);
    margin-bottom: var(--space-3);
}
.eyebrow--light { color: var(--construction-orange); }

.grid { display: grid; gap: var(--space-5); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-services { grid-template-columns: repeat(4, 1fr); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-7); }

.prose { font-size: var(--fs-md); color: var(--text-dark); }
.prose h2 { font-size: var(--fs-xl); margin-top: var(--space-6); }
.prose .lead { font-size: var(--fs-lg); color: var(--secondary-navy); font-weight: 500; }
.lead { font-size: var(--fs-lg); color: var(--secondary-navy); }

/* Reveal-on-scroll (progressive enhancement; visible without JS) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--transition-slow), transform var(--transition-slow); }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* Utilities */
.d-none-mobile { display: inline-flex; }
.d-mobile-only { display: none; }
.text-center { text-align: center; }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    --btn-bg: var(--primary-navy);
    --btn-fg: var(--white);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 46px;
    padding: 0.7rem 1.4rem;
    font-size: var(--fs-sm);
    font-weight: 600;
    line-height: 1.1;
    text-align: center;
    color: var(--btn-fg);
    background: var(--btn-bg);
    border: 2px solid var(--btn-bg);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
}
.btn:hover { color: var(--btn-fg); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); }
.btn i { font-size: 1.05em; }

.btn-primary { --btn-bg: var(--construction-orange); --btn-fg: #2a1a05; border-color: var(--construction-orange); }
.btn-primary:hover { --btn-bg: var(--construction-orange-dark); border-color: var(--construction-orange-dark); color: var(--white); }

.btn-outline { --btn-bg: transparent; --btn-fg: var(--primary-navy); border-color: var(--border); }
.btn-outline:hover { --btn-fg: var(--primary-navy); background: var(--surface-light); border-color: var(--primary-navy); }

.btn-light { --btn-bg: var(--white); --btn-fg: var(--primary-navy); border-color: var(--white); }
.btn-light:hover { --btn-fg: var(--primary-navy); background: var(--warm-sand); border-color: var(--warm-sand); }

.btn-sm { min-height: 40px; padding: 0.5rem 1rem; font-size: var(--fs-xs); }
.btn-lg { min-height: 54px; padding: 0.9rem 1.8rem; font-size: var(--fs-md); }
.btn-block { display: flex; width: 100%; }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header { position: sticky; top: 0; z-index: 1000; background: var(--white); box-shadow: var(--shadow-sm); }

.topbar { background: var(--primary-navy); color: rgba(255, 255, 255, 0.86); font-size: var(--fs-sm); }
.topbar-inner { display: flex; gap: var(--space-6); align-items: center; justify-content: flex-end; min-height: 40px; flex-wrap: wrap; }
.topbar-item { display: inline-flex; align-items: center; gap: 0.4rem; color: rgba(255, 255, 255, 0.86); }
.topbar-item:hover { color: var(--construction-orange); }
.topbar-item i { color: var(--construction-orange); }

.header-main { transition: padding var(--transition); }
.header-inner { display: flex; align-items: center; gap: var(--space-5); min-height: 64px; padding-block: 0.6rem; }

.brand { display: inline-flex; align-items: center; flex-shrink: 0; }
.brand-logo { transition: height var(--transition); }
.brand-logo--full { height: 46px; width: auto; }
.brand-logo--icon { display: none; height: 44px; width: 44px; }

.primary-nav { margin-left: auto; }
.primary-nav-list { display: flex; align-items: center; gap: 0.35rem; list-style: none; margin: 0; padding: 0; }
.primary-nav-list > li > a,
.nav-dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.6rem 0.85rem;
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--secondary-navy);
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    white-space: nowrap;
}
.primary-nav-list > li > a:hover,
.nav-dropdown-toggle:hover { color: var(--construction-orange-dark); background: var(--surface-light); }
.primary-nav-list > li > a.is-active,
.nav-dropdown-toggle.is-active { color: var(--construction-orange-dark); }
.primary-nav-list > li > a.is-active::after {
    content: ""; display: block; position: absolute;
}
.primary-nav-list > li { position: relative; }
.primary-nav-list > li > a.is-active { box-shadow: inset 0 -3px 0 var(--construction-orange); }

/* Desktop dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 260px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 0.5rem;
    display: none;
    z-index: 1100;
}
.nav-dropdown.is-open .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
    display: flex; align-items: center; gap: 0.6rem;
    padding: 0.6rem 0.7rem;
    font-size: var(--fs-sm); font-weight: 500;
    color: var(--secondary-navy); border-radius: var(--radius-sm);
}
.nav-dropdown-menu a:hover { background: var(--surface-light); color: var(--construction-orange-dark); }
.nav-dropdown-menu a i { color: var(--construction-orange-dark); width: 1.2em; text-align: center; }
.nav-dropdown-all { border-bottom: 1px solid var(--border); border-radius: 0; margin-bottom: 0.35rem; font-weight: 700 !important; }
.nav-dropdown-toggle .bi-chevron-down { font-size: 0.75em; transition: transform var(--transition); }
.nav-dropdown.is-open .bi-chevron-down { transform: rotate(180deg); }

.header-actions { flex-shrink: 0; }

/* Scrolled state */
.site-header.is-scrolled { box-shadow: var(--shadow); }
.site-header.is-scrolled .header-inner { min-height: 56px; }
.site-header.is-scrolled .brand-logo--full { height: 40px; }

/* Mobile-only header controls (hidden on desktop) */
.mobile-actions { display: none; align-items: center; gap: 0.5rem; margin-left: auto; }
.mobile-call, .mobile-more-toggle {
    display: inline-flex; flex-direction: column; align-items: center; justify-content: center;
    min-width: 46px; min-height: 46px; gap: 2px;
    font-size: 0.7rem; font-weight: 600;
    color: var(--primary-navy); background: var(--surface-light);
    border: 1px solid var(--border); border-radius: var(--radius-sm); cursor: pointer;
}
.mobile-call { color: var(--white); background: var(--construction-orange); border-color: var(--construction-orange); }
.mobile-call i, .mobile-more-toggle i { font-size: 1.2rem; }
.mobile-more-toggle[aria-expanded="true"] { color: var(--construction-orange-dark); }

/* Mobile "More" slide-down menu */
.mobile-menu { display: none; border-top: 1px solid var(--border); background: var(--white); padding: var(--space-4) var(--gutter) var(--space-5); }
.mobile-menu[hidden] { display: none; }
.mobile-menu.is-open { display: block; }
.mobile-menu-list { list-style: none; margin: 0 0 var(--space-4); padding: 0; }
.mobile-menu-list a {
    display: flex; align-items: center; gap: 0.75rem;
    padding: 0.85rem 0.5rem; min-height: 48px;
    font-size: var(--fs-md); font-weight: 600; color: var(--secondary-navy);
    border-bottom: 1px solid var(--border);
}
.mobile-menu-list a.is-active { color: var(--construction-orange-dark); }
.mobile-menu-list a i { color: var(--construction-orange-dark); width: 1.4em; text-align: center; }
.mobile-menu-contact { display: grid; gap: 0.5rem; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { background: var(--primary-navy); color: rgba(255, 255, 255, 0.78); padding-top: var(--space-8); font-size: var(--fs-sm); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--space-5) var(--space-6); padding-bottom: var(--space-7); }
/* Allow columns to shrink so long content wraps instead of overflowing into the next column. */
.footer-col { min-width: 0; }
.footer-brand { grid-column: span 1; }
.footer-logo { height: 42px; width: auto; margin-bottom: var(--space-4); }
.footer-tagline { color: var(--white); font-weight: 600; font-size: var(--fs-base); }
.footer-note { color: rgba(255, 255, 255, 0.7); }
.footer-heading { color: var(--white); font-size: var(--fs-base); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-4); }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.55rem; }
.footer-links a { color: rgba(255, 255, 255, 0.78); }
.footer-links a:hover { color: var(--construction-orange); }
.footer-address { font-style: normal; color: rgba(255, 255, 255, 0.78); margin-bottom: var(--space-4); overflow-wrap: anywhere; }
.footer-address strong { color: var(--white); }
.footer-contact-list { list-style: none; margin: 0 0 var(--space-4); padding: 0; display: grid; gap: 0.6rem; }
.footer-contact-list li { display: flex; align-items: flex-start; gap: 0.6rem; min-width: 0; }
.footer-contact-list i { color: var(--construction-orange); margin-top: 0.2rem; flex-shrink: 0; }
.footer-contact-list a, .footer-contact-list span { color: rgba(255, 255, 255, 0.85); min-width: 0; overflow-wrap: anywhere; }
.footer-contact-list a:hover { color: var(--construction-orange); }
.footer-directions { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--construction-orange); font-weight: 600; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: var(--space-4); flex-wrap: wrap; padding-block: var(--space-5); border-top: 1px solid rgba(255, 255, 255, 0.12); }
.footer-copyright { margin: 0; color: rgba(255, 255, 255, 0.6); }
.footer-legal { list-style: none; display: flex; gap: var(--space-5); margin: 0; padding: 0; }
.footer-legal a { color: rgba(255, 255, 255, 0.78); }
.footer-legal a:hover { color: var(--construction-orange); }

/* ==========================================================================
   Mobile bottom navigation (app-style)
   ========================================================================== */
.mobile-bottom-nav {
    display: none;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 1200;
    background: var(--white);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 16px rgba(16, 42, 67, 0.1);
    padding-bottom: env(safe-area-inset-bottom);
}
.mobile-bottom-nav-list { display: flex; list-style: none; margin: 0; padding: 0; }
.mobile-bottom-nav-list li { flex: 1; }
.mobile-bottom-nav-item {
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
    min-height: var(--mobile-nav-height);
    padding: 6px 2px;
    font-size: 0.68rem; font-weight: 600;
    color: var(--text-muted);
    text-align: center;
}
.mobile-bottom-nav-item i { font-size: 1.35rem; line-height: 1; }
.mobile-bottom-nav-item.is-active { color: var(--construction-orange-dark); }
.mobile-bottom-nav-item.is-active i { transform: translateY(-1px); }
.mobile-bottom-nav-item:active { background: var(--surface-light); }
.mobile-bottom-nav-item:focus-visible { outline-offset: -3px; }
.mobile-bottom-nav-label { line-height: 1; }

/* ==========================================================================
   Back-to-top
   ========================================================================== */
.back-to-top {
    position: fixed;
    right: 18px; bottom: 18px;
    z-index: 1100;
    width: 48px; height: 48px;
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--primary-navy); color: var(--white);
    border: none; border-radius: 50%;
    box-shadow: var(--shadow-md); cursor: pointer;
    opacity: 0; visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition), background var(--transition);
}
.back-to-top.is-visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--construction-orange-dark); }
.back-to-top i { font-size: 1.25rem; }

/* ==========================================================================
   Flash messages
   ========================================================================== */
.flash-container { padding-top: var(--space-5); }
.flash {
    display: flex; align-items: flex-start; gap: 0.75rem;
    padding: 1rem 1.1rem; margin-bottom: var(--space-4);
    border-radius: var(--radius); border: 1px solid var(--border);
    background: var(--white); box-shadow: var(--shadow-sm);
}
.flash p { margin: 0; flex: 1; }
.flash i:first-child { font-size: 1.25rem; margin-top: 0.1rem; }
.flash-success { border-color: rgba(46, 125, 50, 0.4); background: #f2f9f2; color: #1e5121; }
.flash-success i:first-child { color: var(--success); }
.flash-error { border-color: rgba(198, 40, 40, 0.4); background: #fdf3f3; color: #8f2020; }
.flash-error i:first-child { color: var(--danger); }
.flash-info { border-color: rgba(16, 42, 67, 0.25); background: var(--surface-light); color: var(--secondary-navy); }
.flash-info i:first-child { color: var(--secondary-navy); }
.flash-close { background: none; border: none; color: inherit; cursor: pointer; font-size: 0.95rem; padding: 0.2rem; opacity: 0.7; }
.flash-close:hover { opacity: 1; }

/* ==========================================================================
   Reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
    .js .reveal { opacity: 1 !important; transform: none !important; }
}