/* =============================================
   StrataStack Solutions - Website Styles
   ============================================= */

/* CSS Custom Properties */
:root {
    --ink: #102a43;
    --ink-2: #1f4668;
    --accent: #2c6ea5;
    --accent-2: #5c8cb6;
    --bg: #edf3f8;
    --surface: #f7fafc;
    --card: #ffffff;
    --line: #d4dfeb;
    --line-strong: #c3d3e3;
    --muted: #4f6478;
    --radius: 14px;
    --shadow: 0 2px 10px rgba(16, 42, 67, 0.06);
}
/* Base Styles */
html,
body {
    height: 100%;
}

/* Smooth scroll for anchor links (respects reduced motion below) */
html {
    scroll-behavior: smooth;
}

section[id],
main[id] {
    scroll-margin-top: 88px;
}

body {
    margin: 0;
    font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Inter, "Helvetica Neue", Arial, sans-serif;
    color: var(--ink);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

.container {
    max-width: 1080px;
    margin-inline: auto;
    padding: 24px;
}
/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    background: linear-gradient(180deg, rgba(245, 250, 255, 0.96) 0%, rgba(237, 243, 248, 0.94) 100%);
    backdrop-filter: saturate(140%) blur(6px);
    border-bottom: 1px solid var(--line-strong);
    z-index: 50;
    box-shadow: 0 2px 8px rgba(16, 42, 67, 0.05);
    transition: background-color 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
    animation: headerEnter 420ms ease-out;
}

/* Slight elevation when page is scrolled */
header.scrolled {
    box-shadow: 0 10px 24px rgba(16, 42, 67, 0.11);
    background: linear-gradient(180deg, rgba(245, 250, 255, 0.98) 0%, rgba(236, 242, 248, 0.98) 100%);
}

.nav {
    display: flex;
    align-items: center;
    gap: 18px;
    justify-content: space-between;
    padding: 8px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    color: inherit;
    transition: transform 180ms ease;
}

.brand:hover {
    transform: translateY(-1px);
}

.brand img {
    height: 54px;
    width: auto;
    display: block;
    border-radius: 12px;
    background: transparent;
}

.brand .title {
    font-weight: 800;
    letter-spacing: 0.2px;
}

.brand small {
    display: block;
    color: var(--muted);
    font-weight: 500;
    margin-top: -4px;
}

nav a {
    color: var(--ink);
    text-decoration: none;
    font-weight: 600;
    opacity: 0.9;
}

nav a:hover {
    opacity: 1;
}

.nav-links {
    display: flex;
    gap: 22px;
    padding: 6px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.78);
}

.nav-links a {
    padding: 6px 10px;
    border-radius: 999px;
    border-bottom: 2px solid transparent;
    transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.nav-links a:hover {
    background: #e6f0fa;
    color: var(--ink-2);
    transform: translateY(-1px);
}

.nav-links a.active {
    border-bottom-color: transparent;
    color: #fff;
    background: linear-gradient(180deg, var(--accent) 0%, var(--ink-2) 100%);
    box-shadow: 0 5px 12px rgba(31, 70, 104, 0.28);
}

@keyframes headerEnter {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
/* Hero Section */
.hero {
    padding: 64px 0 40px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 28px;
    align-items: center;
}
/* Cards & Components */
.card {
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.card.pad {
    padding: 28px;
}
/* Typography */
h1 {
    font-size: clamp(28px, 4.2vw, 42px);
    line-height: 1.15;
    margin: 0 0 10px;
}

.lead {
    font-size: clamp(16px, 2.2vw, 19px);
    color: var(--muted);
    margin: 0 0 16px;
}

.credibility {
    margin: 0 0 10px;
    color: var(--ink-2);
    font-weight: 600;
}

.muted {
    color: var(--muted);
}
/* Tags & Buttons */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 14px 0 0;
}

.tag {
    padding: 6px 10px;
    border-radius: 999px;
    background: #dceaf7;
    color: #1d4466;
    border: 1px solid #c5d9eb;
    font-weight: 600;
    font-size: 13px;
}

.chip {
    padding: 6px 10px;
    border-radius: 999px;
    background: #e7f0f9;
    color: var(--ink-2);
    border: 1px solid #c9d9ea;
    font-weight: 600;
    font-size: 13px;
    transition: transform 120ms ease, box-shadow 200ms ease, background-color 200ms ease;
}

.chip:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(16, 42, 67, 0.06);
    background: #dceaf7;
}

.credentials,
.chip-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.credentials {
    margin: 12px 0;
}

.cta {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.btn {
    appearance: none;
    border: 0;
    border-radius: 12px;
    padding: 12px 16px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    transition: transform 120ms ease, box-shadow 200ms ease, background-color 200ms ease, color 200ms ease;
}

.btn.primary {
    background: var(--ink);
    color: #fff;
}

.btn.secondary {
    background: #dde9f5;
    color: var(--ink);
}

.btn.ghost {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--line-strong);
}

.btn.ghost:hover {
    background: #e5eef7;
}

.btn:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 12px rgba(16, 42, 67, 0.10);
}
/* Sections & Layout */
section {
    padding: 28px 0;
}

section > .container {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: calc(var(--radius) + 2px);
    box-shadow: 0 3px 12px rgba(16, 42, 67, 0.06);
}

section h2 {
    font-size: 22px;
    margin: 0 0 8px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.item {
    background: linear-gradient(180deg, #ffffff 0%, #fdfefe 100%);
    border-radius: var(--radius);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 18px;
}

.item h3 {
    margin: 4px 0 6px;
    font-size: 18px;
}

.approach-list {
    margin: 0;
    padding: 20px 20px 20px 38px;
}

.approach-list li {
    margin-bottom: 10px;
}

.capability-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.capability-card {
    background: linear-gradient(180deg, #ffffff 0%, #fcfeff 100%);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px;
    border: 1px solid var(--line);
}

.capability-card summary {
    font-weight: 700;
    cursor: pointer;
    list-style: none;
    margin-bottom: 10px;
}

.capability-card summary::-webkit-details-marker {
    display: none;
}

.capability-card summary::after {
    content: "+";
    float: right;
    color: var(--accent);
}

.capability-card[open] summary::after {
    content: "−";
}

.capability-card:focus-within,
.capability-card summary:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

.subhead {
    margin: 12px 0 6px;
    font-weight: 700;
    color: var(--ink-2);
}

.work-grid p {
    margin: 8px 0;
}

.disclosure {
    margin-top: 14px;
    font-size: 14px;
}

.contact-form {
    display: grid;
    gap: 10px;
}

.contact-form label {
    font-weight: 600;
    color: var(--ink-2);
}

.contact-form input,
.contact-form textarea {
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    padding: 10px 12px;
    font: inherit;
    color: inherit;
    background: #fbfdff;
}

.contact-form input:focus-visible,
.contact-form textarea:focus-visible,
.nav-links a:focus-visible,
a:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

.hp {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.response-time {
    margin-top: 8px;
}

dialog {
    border: none;
    border-radius: var(--radius);
    max-width: 740px;
    width: min(92vw, 740px);
    padding: 0;
    border: 1px solid var(--line);
    box-shadow: 0 10px 26px rgba(16, 42, 67, 0.18);
}

dialog::backdrop {
    background: rgba(16, 42, 67, 0.4);
}

.modal-content {
    padding: 22px;
}

.modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.modal-fallback {
    position: fixed;
    inset: 0;
    z-index: 100;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 44, 63, 0.45);
}

.modal-panel {
    position: relative;
    margin: 6vh auto;
    width: min(92vw, 740px);
    max-height: 88vh;
    overflow: auto;
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    box-shadow: 0 10px 26px rgba(16, 42, 67, 0.18);
}

.back-to-top {
    position: fixed;
    right: 18px;
    bottom: 18px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity 200ms ease, transform 200ms ease;
    z-index: 70;
}

.back-to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: none;
}

.hero-logo {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius);
    background: transparent;
}

/* Lists */
.list {
    margin: 0 0 4px 18px;
}

.hint {
    margin: 0.5rem 0 0;
}
/* Footer */
footer {
    margin-top: 40px;
    padding: 28px 0;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 14px;
}

footer a {
    color: inherit;
}

/* Motion: subtle reveal on scroll */
.reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 500ms ease, transform 500ms ease;
    will-change: opacity, transform;
}

.reveal.is-visible {
    opacity: 1;
    transform: none;
}

/* Responsive Design */
@media (max-width: 880px) {
    .hero-grid {
        grid-template-columns: 1fr;
    }
    
    .grid {
        grid-template-columns: 1fr;
    }
    
    .two-col {
        grid-template-columns: 1fr;
    }

    .capability-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        gap: 12px;
        flex-wrap: wrap;
        justify-content: flex-end;
        font-size: 14px;
    }

    .cta {
        flex-wrap: wrap;
    }
}

/* Respect user preferences: minimize 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;
        scroll-behavior: auto !important;
    }
    .reveal {
        opacity: 1 !important;
        transform: none !important;
    }

    .btn,
    .chip,
    .back-to-top {
        transition: none !important;
        transform: none !important;
    }
}