/* ==========================================================================
   DURANTIC LANDING - shared page chrome
   Used by index.html, /platform/, and every /solutions/<slug>/ page.
   Depends on durantic-design-system.css for tokens.

   Page-specific components (the hero, the platform lifecycle strip) stay
   inline in index.html; the platform page keeps its own inline components too.
   ========================================================================== */

body { background: var(--color-page); color: var(--color-black); font-family: 'Inter', var(--font-sans); }
::selection { background: var(--color-primary); color: var(--color-white); }

/* ---- Navigation (dark) ---- */
/* Solid, not translucent: over the light page background the old rgba nav
   composited to a lighter band that read as an overlay stripe. */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: var(--color-surface-dark); border-bottom: 1px solid rgba(255,255,255,0.07); }
.nav-container { max-width: var(--container-max); margin: 0 auto; padding: var(--space-4) var(--container-padding); display: flex; justify-content: space-between; align-items: center; }
/* The only logo asset is solid black artwork; force it white for the dark bar. */
.nav-logo img { height: 30px; display: block; filter: brightness(0) invert(1); }
.nav-menu { display: flex; align-items: center; gap: var(--space-7); }
.nav-link { color: var(--color-gray-300); text-decoration: none; font-size: var(--text-sm); font-weight: var(--font-medium); letter-spacing: var(--tracking-wide); text-transform: uppercase; transition: color var(--transition-fast); }
.nav-link:hover { color: var(--color-white); text-decoration: none; }

/* Nav buttons: a pair (Login + Get a demo), tighter and smaller than body
   buttons so they suit the compact navbar. */
.nav-cta { display: flex; align-items: center; gap: var(--space-3); }
.nav-menu .btn { padding: var(--space-2) var(--space-5); font-size: var(--text-sm); white-space: nowrap; }

/* ---- Navigation: Solutions dropdown (CSS only, no JS) ---- */
.nav-item { position: relative; display: flex; align-items: center; }
.nav-item > .nav-link { display: inline-flex; align-items: center; gap: 6px; }
.nav-item > .nav-link .caret { width: 9px; height: 9px; flex-shrink: 0; transition: transform var(--transition-fast); }
.nav-sub {
    position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
    min-width: 302px; padding: var(--space-2) 0; margin-top: var(--space-4);
    background: var(--color-white); border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 28px -8px rgba(15, 23, 42, 0.28);
    opacity: 0; visibility: hidden; pointer-events: none;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
}
/* Invisible bridge so the pointer can travel from trigger to panel. */
.nav-sub::before { content: ''; position: absolute; top: calc(-1 * var(--space-4) - 1px); left: 0; right: 0; height: var(--space-4); }
.nav-item:hover .nav-sub,
.nav-item:focus-within .nav-sub { opacity: 1; visibility: visible; pointer-events: auto; }
.nav-item:hover > .nav-link .caret,
.nav-item:focus-within > .nav-link .caret { transform: rotate(180deg); }
.nav-sub a {
    display: flex; align-items: center; gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    color: var(--color-black); text-decoration: none;
    font-size: var(--text-sm); font-weight: var(--font-medium); line-height: 1.3;
}
.nav-sub a:hover, .nav-sub a:focus-visible { background: var(--color-primary-light); color: var(--color-primary-dark); text-decoration: none; }
.nav-sub a[aria-current="page"] { background: var(--color-primary-light); box-shadow: inset 3px 0 0 var(--color-primary); }

/* Icon tile in each dropdown row. Same glyphs as the solution cards, stroke-only
   and thicker so they stay crisp at 18px. */
.nav-ic {
    flex: 0 0 28px; width: 28px; height: 28px;
    display: grid; place-items: center;
    background: var(--color-primary-light); border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}
.nav-ic svg { width: 18px; height: 18px; display: block; }
.nav-sub a:hover .nav-ic, .nav-sub a:focus-visible .nav-ic { background: #DCE7FB; }

/* ---- Section scaffolding ---- */
.section { padding: var(--space-24) 0; }
.section.dark { background: var(--color-surface-dark); color: var(--color-white); }
.section.dark .section-label, .section.dark .section-sub { color: var(--color-gray-400); }
.section.dark h2 { color: var(--color-white); }
.section-head { max-width: 760px; }
.section-head.center { margin: 0 auto; text-align: center; }
.section-label { font-family: var(--font-mono); font-size: var(--text-sm); font-weight: var(--font-medium); color: var(--color-gray-700); letter-spacing: var(--tracking-wider); text-transform: uppercase; margin-bottom: var(--space-4); }
.section-title { font-size: var(--text-5xl); font-weight: 700; letter-spacing: -0.03em; line-height: 1.05; margin-bottom: var(--space-4); }
.section-sub { font-size: var(--text-lg); color: var(--color-gray-700); line-height: var(--leading-relaxed); }

/* Prose links inside body copy. Uses primary-DARK, not primary: #3B82F6 on the
   page background is 3.52:1, under the 4.5:1 floor for text. #2563EB is 4.94:1.
   Without this rule these inherit the browser default and render purple once
   visited. */
.section-sub a, .c-lede a, .sol-block a {
    color: var(--color-primary-dark);
    text-decoration: underline;
    text-underline-offset: 2px;
    text-decoration-thickness: 1px;
}
.section-sub a:hover, .c-lede a:hover, .sol-block a:hover { text-decoration-thickness: 2px; }
/* On navy, small text needs the lighter tint. */
.section.dark .section-sub a { color: var(--color-accent); }

.img-slot { position: relative; overflow: hidden; }
.img-slot svg { width: 100%; height: 100%; display: block; }

.hero-actions { display: flex; gap: var(--space-4); flex-wrap: wrap; }
/* Larger CTA, for a page whose whole purpose is the one action. */
.btn-lg { padding: var(--space-4) var(--space-9); font-size: var(--text-lg); }

/* Split page hero: copy on the left, a single CTA in the empty right column.
   Used by /solutions/managed-service/, which has no diagram to fill the space. */
.page-hero--split .container { display: grid; grid-template-columns: 1fr auto; gap: var(--space-12); align-items: center; }
.page-hero--split .ph-aside { justify-self: end; }
@media (max-width: 900px) {
    .page-hero--split .container { grid-template-columns: 1fr; gap: var(--space-8); }
    .page-hero--split .ph-aside { justify-self: start; }
}

/* ==========================================================================
   SOLUTIONS - card grid (main page)
   8 cards in a 4-column grid: exactly two full rows, no card spans.
   ========================================================================== */

.sol-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5); margin-top: var(--space-12); }
.sol-card {
    display: flex; flex-direction: column; gap: var(--space-3);
    padding: var(--space-7); background: var(--color-white);
    border: 1px solid var(--color-gray-200); text-decoration: none; color: inherit;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
.sol-card:hover { transform: translateY(-3px); box-shadow: 0 12px 24px -10px rgba(15,23,42,0.22); border-color: var(--color-primary); }
.sol-card .s-ic { width: 44px; height: 44px; }
.sol-card .s-ic svg { width: 100%; height: 100%; }
.sol-card h3 { font-size: var(--text-xl); font-weight: 700; letter-spacing: -0.01em; line-height: 1.15; }
.sol-card p { font-size: var(--text-sm); color: var(--color-gray-700); line-height: 1.55; margin: 0; }
.sol-card .s-more { margin-top: auto; padding-top: var(--space-3); font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); text-transform: uppercase; color: var(--color-gray-700); }
.sol-card:hover .s-more { color: var(--color-primary-dark); }
.sol-card .s-more::after { content: ' →'; }

/* Lead card - wider, tinted, carries the flagship story. */
/* The lead card keeps a tint for emphasis but no longer spans two columns:
   8 cards fill the 4-column grid exactly, so a span would orphan the last row. */
.sol-card.lead { background: var(--color-primary-light); border-color: #C7D9FB; }

@media (max-width: 1180px) { .sol-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .sol-grid { grid-template-columns: 1fr; } }

/* ==========================================================================
   SOLUTION PAGE TEMPLATE
   ========================================================================== */

/* ---- Page hero ---- */
.page-hero { margin-top: 62px; padding: var(--space-20) 0 var(--space-16); background: linear-gradient(180deg, #FFFFFF 0%, #EEF2F8 100%); border-bottom: 1px solid var(--color-gray-200); }
.page-hero .crumb { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--color-gray-600); margin-bottom: var(--space-5); }
.page-hero .crumb a { color: var(--color-gray-600); text-decoration: none; }
.page-hero .crumb a:hover { color: var(--color-black); text-decoration: underline; }
.page-hero .crumb span { color: var(--color-black); }
.page-hero h1 { font-size: clamp(2.25rem, 4.4vw, 3.75rem); font-weight: 800; letter-spacing: -0.035em; line-height: 1.08; max-width: 900px; margin-bottom: var(--space-6); }
.page-hero h1 .accent { color: var(--color-primary); }
.page-hero .lede { font-size: var(--text-xl); color: var(--color-gray-700); line-height: 1.55; max-width: 720px; margin-bottom: var(--space-8); }

/* ---- Wide diagram band (dark) ---- */
.sol-figure { background: var(--color-surface-dark); padding: var(--space-16) 0; }
.sol-figure figure { margin: 0; }
.sol-figure .fig-scroll { max-width: 1000px; margin: 0 auto; }
.fig-hint { display: none; }

/* Below ~860px these wide diagrams would shrink until their sub-labels are
   unreadable, so pin a legible minimum and let the figure pan instead. */
@media (max-width: 860px) {
    .sol-figure .fig-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .sol-figure .fig-scroll .img-slot { min-width: 740px; }
    .fig-hint { display: block; margin-top: var(--space-4); text-align: center; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); text-transform: uppercase; color: var(--color-gray-400); }
    .fig-hint::after { content: ' →'; }
}

/* ---- Three prose blocks ---- */
.sol-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-10); margin-top: var(--space-12); }
.sol-block .b-num { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-wider); color: var(--color-gray-500); margin-bottom: var(--space-3); padding-bottom: var(--space-3); border-bottom: 1px solid var(--color-gray-200); }
.sol-block h2 { font-size: var(--text-2xl); font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: var(--space-3); }
.sol-block p { font-size: var(--text-base); color: var(--color-gray-700); line-height: var(--leading-relaxed); margin: 0 0 var(--space-3); }
.sol-block p:last-child { margin-bottom: 0; }
.sol-block b { color: var(--color-black); font-weight: 600; }
@media (max-width: 980px) { .sol-cols { grid-template-columns: 1fr; gap: var(--space-8); } }

/* ---- Related cards: solution pages ("Related solutions") and /platform/ ("Go deeper") ---- */
.related { padding: var(--space-16) 0; background: var(--color-secondary-light); border-top: 1px solid var(--color-gray-200); }
.related .r-label { font-family: var(--font-mono); font-size: var(--text-sm); font-weight: var(--font-medium); color: var(--color-gray-700); letter-spacing: var(--tracking-wider); text-transform: uppercase; margin-bottom: var(--space-6); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.related-card { display: flex; flex-direction: column; gap: var(--space-2); padding: var(--space-6); background: var(--color-white); border: 1px solid var(--color-gray-200); text-decoration: none; color: inherit; transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base); }
.related-card:hover { transform: translateY(-3px); box-shadow: 0 12px 24px -10px rgba(15,23,42,0.22); border-color: var(--color-primary); }
.related-card strong { font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.01em; }
.related-card span { font-size: var(--text-sm); color: var(--color-gray-700); line-height: 1.5; }
.related-card em { margin-top: auto; padding-top: var(--space-3); font-family: var(--font-mono); font-size: var(--text-xs); font-style: normal; letter-spacing: var(--tracking-wide); text-transform: uppercase; color: var(--color-gray-600); }
.related-card em::after { content: ' →'; }
@media (max-width: 900px) { .related-grid { grid-template-columns: 1fr; } }

/* ==========================================================================
   CTA
   ========================================================================== */

.cta { background: var(--color-surface-dark); color: var(--color-white); padding: var(--space-24) 0; }
.cta h2 { color: var(--color-white); font-size: var(--text-5xl); letter-spacing: -0.03em; margin-bottom: var(--space-4); max-width: 720px; }
.cta p { color: var(--color-gray-400); font-size: var(--text-lg); margin-bottom: var(--space-8); max-width: 620px; }

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer { padding: var(--space-12) 0; border-top: 1px solid var(--color-gray-200); background: var(--color-white); }

/* Footer nav - also the only route to solution pages on mobile, where the
   header links are hidden. Keep every solution linked here. */
.footer-nav { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--space-10); padding-bottom: var(--space-10); margin-bottom: var(--space-10); border-bottom: 1px solid var(--color-gray-200); }
.footer-col h4 { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: var(--font-medium); color: var(--color-gray-600); letter-spacing: var(--tracking-wider); text-transform: uppercase; margin-bottom: var(--space-4); }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: var(--space-2); }
.footer-col a { font-size: var(--text-sm); color: var(--color-gray-700); text-decoration: none; }
.footer-col a:hover { color: var(--color-black); text-decoration: underline; }
.footer-col.wide ul { columns: 2; column-gap: var(--space-8); }
@media (max-width: 900px) { .footer-nav { grid-template-columns: 1fr 1fr; } .footer-col.wide { grid-column: span 2; } }
@media (max-width: 560px) { .footer-nav { grid-template-columns: 1fr; } .footer-col.wide { grid-column: span 1; } .footer-col.wide ul { columns: 1; } }

.footer-trademarks { font-size: var(--text-xs); color: var(--color-gray-500); line-height: 1.6; max-width: 920px; margin: 0 auto var(--space-8); text-align: center; }
.footer-content { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: var(--space-8); }
.footer-left p { font-size: var(--text-sm); color: var(--color-gray-600); margin: 0; }
.footer-social { display: flex; gap: var(--space-4); justify-content: center; align-items: center; }
.footer-social a { color: var(--color-gray-600); }
.footer-social a:hover { color: var(--color-black); }

@media (max-width: 480px) {
    /* Logo + both buttons overflow below ~470px. Keep the primary action
       (Login); "Get a demo" is still offered by the CTA at the page foot. */
    .nav-cta .btn-light { display: none; }
}

@media (max-width: 768px) {
    /* Header links collapse on mobile; the footer nav carries navigation. */
    .nav-menu .nav-link, .nav-menu .nav-item { display: none; }
    .footer-content { grid-template-columns: 1fr; text-align: center; gap: var(--space-5); }
}