/* ==========================================================================
   SentinelX — corporate design system
   ========================================================================== */

:root {
    --navy-950: #060B16;
    --navy-900: #0B1426;
    --navy-800: #12203A;
    --ink: #0F172A;
    --body: #475569;
    --muted: #64748B;
    --line: #E2E8F0;
    --bg: #FFFFFF;
    --surface: #FFFFFF;
    --border-strong: #CBD5E1;
    --header-bg: rgba(255, 255, 255, .88);
    --footer-bg: #111827;
    --bg-soft: #F7F9FC;
    --accent: #2563EB;
    --accent-strong: #1D4ED8;
    --accent-soft: #EFF4FF;
    --radius: 12px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
    --shadow-md: 0 12px 32px -12px rgba(15, 23, 42, .18);
}

[data-theme="dark"] {
    --ink: #EDF2FA;
    --body: #A9B6C9;
    --muted: #8595AC;
    --line: #263650;
    --bg: #0F172A;
    --surface: #16213A;
    --border-strong: #35496B;
    --header-bg: rgba(15, 23, 42, .86);
    --footer-bg: #0B1120;
    --bg-soft: #131D31;
    --accent: #4C8DFF;
    --accent-strong: #6BA1FF;
    --accent-soft: rgba(76, 141, 255, .14);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
    --shadow-md: 0 14px 34px -12px rgba(0, 0, 0, .55);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: var(--body);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    transition: background-color .2s ease, color .2s ease;
}

h1, h2, h3, h4 {
    color: var(--ink);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin: 0 0 16px;
    font-weight: 700;
}

h1 { font-size: clamp(2.1rem, 5vw, 3.25rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.25rem); }
h3 { font-size: 1.125rem; letter-spacing: -0.01em; }

p { margin: 0 0 16px; }

a { color: var(--accent); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent-strong); }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
    color: var(--ink);
}
.brand-mark img {
    display: block;
    width: auto;
    height: 21px;
}

.brand:hover { color: var(--ink); }
.brand-accent { color: var(--accent); }
.brand-light { color: #fff; }
.brand-light:hover { color: #fff; }
.brand-accent-light { color: #60A5FA; }

.site-nav { display: flex; align-items: center; gap: 32px; }

.site-nav a {
    color: var(--body);
    font-weight: 500;
    font-size: .925rem;
}
.site-nav a:hover { color: var(--ink); }

.site-nav .nav-cta {
    background: var(--accent);
    color: #fff;
    padding: 9px 18px;
    border-radius: 8px;
    font-weight: 600;
}
.site-nav .nav-cta:hover { background: var(--accent-strong); color: #fff; }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: 0;
    padding: 8px;
    cursor: pointer;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: transparent;
    color: var(--body);
    cursor: pointer;
    transition: color .15s ease, border-color .15s ease;
}

.theme-toggle:hover { color: var(--ink); border-color: var(--border-strong); }

.icon-sun { display: none; }

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform .2s ease, opacity .2s ease;
}

@media (max-width: 780px) {
    .nav-toggle { display: flex; }

    .site-nav {
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--surface);
        border-bottom: 1px solid var(--line);
        padding: 8px 24px 16px;
        display: none;
        box-shadow: var(--shadow-md);
    }
    .site-nav.open { display: flex; }
    .site-nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
    .site-nav a:last-child { border-bottom: 0; }
    .site-nav .nav-cta { text-align: center; margin-top: 8px; }

    body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
    body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
    display: inline-block;
    padding: 13px 26px;
    border-radius: 8px;
    font-weight: 600;
    font-size: .95rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background .15s ease, color .15s ease, border-color .15s ease;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); color: #fff; }

.btn-outline {
    background: transparent;
    color: var(--ink);
    border-color: var(--border-strong);
}
.btn-outline:hover { border-color: var(--ink); color: var(--ink); }

.btn-block { width: 100%; }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
    position: relative;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    color: var(--body);
    overflow: hidden;
}

.hero-inner {
    position: relative;
    padding: 96px 24px 80px;
    text-align: center;
    max-width: 880px;
    margin: 0 auto;
}

.hero-eyebrow {
    display: inline-block;
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 24px;
}

.hero h1 { color: var(--ink); margin-bottom: 22px; }

.hero-sub {
    font-size: 1.125rem;
    max-width: 620px;
    margin: 0 auto 34px;
    color: var(--muted);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 26px;
}

.hero-note {
    font-size: .86rem;
    color: var(--muted);
    margin: 0;
}

.hero-note::before, .hero-note::after {
    content: "";
    display: inline-block;
    width: 24px;
    height: 1px;
    background: var(--line);
    vertical-align: middle;
    margin: 0 12px;
}

@media (max-width: 780px) {
    .hero-inner { padding-top: 72px; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .desktop-br { display: none; }
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

.section { padding: 96px 0; }
.section-alt { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head { max-width: 640px; margin: 0 auto 56px; text-align: center; }

.section-eyebrow,
.page-hero .section-eyebrow {
    display: inline-block;
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 14px;
}

.section-sub { color: var(--muted); font-size: 1.05rem; margin: 12px auto 0; }

/* --------------------------------------------------------------------------
   Service cards
   -------------------------------------------------------------------------- */

.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: #C7D6F5;
}

.card-featured { border-color: #C7D6F5; }

.card-icon {
    width: 46px;
    height: 46px;
    border-radius: 10px;
    background: var(--accent-soft);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.card p { font-size: .95rem; }

.card-list {
    list-style: none;
    margin: 0 0 26px;
    padding: 0;
    font-size: .92rem;
}

.card-list li { padding: 7px 0 7px 24px; position: relative; }

.card-list li::before {
    content: "";
    position: absolute;
    left: 2px;
    top: 14px;
    width: 12px;
    height: 6px;
    border-left: 2px solid var(--accent);
    border-bottom: 2px solid var(--accent);
    transform: rotate(-45deg);
}

.card-link {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: .95rem;
}

@media (max-width: 900px) {
    .cards { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
}

/* --------------------------------------------------------------------------
   Features
   -------------------------------------------------------------------------- */

.features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px 28px;
}

.feature-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: var(--surface);
    border: 1px solid var(--line);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.feature h3 { font-size: 1rem; }
.feature p { font-size: .92rem; margin: 0; }

@media (max-width: 900px) {
    .features { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
    .features { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   CTA band
   -------------------------------------------------------------------------- */

.cta-band {
    background: var(--bg-soft);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 84px 0;
}

.cta-band-compact { padding: 64px 0; }

.cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 36px;
    flex-wrap: wrap;
}

.cta-inner h2 { color: var(--ink); margin-bottom: 10px; }
.cta-inner p { color: var(--muted); margin: 0; }

.cta-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* --------------------------------------------------------------------------
   Page hero (subpages)
   -------------------------------------------------------------------------- */

.page-hero {
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    color: var(--muted);
    padding: 72px 0;
}

.page-hero h1 { color: var(--ink); margin-bottom: 12px; }
.page-hero-sub { max-width: 640px; font-size: 1.08rem; margin: 0; }

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

.contact-steps {
    counter-reset: step;
    list-style: none;
    margin: 0 0 32px;
    padding: 0;
}

.contact-steps li {
    counter-increment: step;
    position: relative;
    padding: 0 0 20px 52px;
}

.contact-steps li::before {
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: 1px;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 700;
    font-size: .82rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-channels p { font-size: .95rem; }

.card-form {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 36px 34px;
}

.form-row { margin-bottom: 20px; }

label {
    display: block;
    font-weight: 600;
    font-size: .88rem;
    color: var(--ink);
    margin-bottom: 7px;
}

input[type="text"],
input[type="email"],
select,
textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    font: inherit;
    font-size: .95rem;
    color: var(--ink);
    background: var(--surface);
    transition: border-color .15s ease, box-shadow .15s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .14);
}

textarea { resize: vertical; min-height: 140px; }

.field-error { color: #DC2626; font-size: .84rem; margin: 6px 0 0; }

.form-note { font-size: .82rem; color: var(--muted); margin: 14px 0 0; }

.alert { padding: 14px 16px; border-radius: 8px; font-size: .92rem; margin-bottom: 22px; }
.alert-success { background: #ECFDF5; color: #047857; border: 1px solid #A7F3D0; }
.alert-error { background: #FEF2F2; color: #B91C1C; border: 1px solid #FECACA; }

@media (max-width: 860px) {
    .contact-grid { grid-template-columns: 1fr; gap: 44px; }
}

/* --------------------------------------------------------------------------
   Prose / legal pages
   -------------------------------------------------------------------------- */

.prose { max-width: 760px; }

.prose h2 {
    font-size: 1.25rem;
    margin: 40px 0 12px;
}

.prose p { font-size: .98rem; }

.prose-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px 64px;
    max-width: 1020px;
}

.prose-block h2 { font-size: 1.3rem; margin-bottom: 12px; }
.prose-block p, .prose-block ul { font-size: .97rem; }
.prose-block ul, .prose ul { padding-left: 20px; margin: 0 0 16px; }
.prose-block li, .prose li { margin-bottom: 8px; }

@media (max-width: 760px) {
    .prose-grid { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   Documentation
   -------------------------------------------------------------------------- */

.page-hero-docs .section-eyebrow a { color: inherit; }
.page-hero-docs .section-eyebrow a:hover { color: var(--accent); }

.docs-meta {
    margin-top: 18px;
    font-size: .85rem;
    color: var(--muted);
}

.docs-group { margin-bottom: 44px; }
.docs-group:last-child { margin-bottom: 0; }

.docs-group-title {
    font-size: 1.05rem;
    letter-spacing: -.01em;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line);
}

.docs-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.docs-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px 20px;
    color: inherit;
    box-shadow: var(--shadow-sm);
    transition: border-color .16s ease, transform .16s ease, box-shadow .16s ease;
}

.docs-item:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    color: inherit;
}

.docs-item-title { font-weight: 600; color: var(--ink); }

.docs-item-desc {
    font-size: .9rem;
    color: var(--muted);
    line-height: 1.55;
}

.docs-item-meta { margin-top: auto; padding-top: 8px; font-size: .78rem; color: var(--muted); }

.docs-body { max-width: 760px; }
.docs-body h2 { font-size: 1.3rem; margin: 40px 0 12px; letter-spacing: -.01em; }
.docs-body h2:first-child { margin-top: 0; }
.docs-body h3 { font-size: 1.08rem; margin: 28px 0 10px; }
.docs-body p { font-size: .98rem; line-height: 1.7; margin: 0 0 14px; }
.docs-body ul, .docs-body ol { font-size: .97rem; padding-left: 22px; margin: 0 0 16px; }
.docs-body li { margin-bottom: 8px; line-height: 1.65; }
.docs-body strong { font-weight: 600; }
.docs-body code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: .88em;
    background: var(--bg-soft);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 1px 5px;
}
.docs-body pre {
    background: var(--bg-soft);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px 18px;
    overflow-x: auto;
    margin: 0 0 18px;
}
.docs-body pre code {
    background: none;
    border: 0;
    padding: 0;
    font-size: .86rem;
    line-height: 1.6;
    white-space: pre;
}
.docs-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 0 18px;
    font-size: .9rem;
}
.docs-body th, .docs-body td {
    border: 1px solid var(--line);
    padding: 9px 12px;
    text-align: left;
    vertical-align: top;
}
.docs-body th { background: var(--bg-soft); font-weight: 600; color: var(--ink); }

.docs-pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 48px;
    padding-top: 28px;
    border-top: 1px solid var(--line);
}
.docs-pager-link {
    display: flex;
    flex-direction: column;
    gap: 3px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px 18px;
    background: var(--surface);
    color: inherit;
    transition: border-color .16s ease;
}
.docs-pager-link:hover { border-color: var(--accent); color: inherit; }
.docs-pager-next { text-align: right; }
.docs-pager-label { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.docs-pager-title { font-weight: 600; font-size: .95rem; }

.docs-footnote {
    max-width: 760px;
    margin-top: 32px;
    padding: 20px 22px;
    background: var(--bg-soft);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}
.docs-footnote p { font-size: .88rem; color: var(--muted); margin: 0 0 10px; }
.docs-footnote p:last-child { margin-bottom: 0; }
.docs-footnote strong { color: var(--ink); }

.docs-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    max-width: 1020px;
}
.docs-cta h2 { font-size: 1.3rem; margin-bottom: 8px; }
.docs-cta p { font-size: .95rem; color: var(--muted); margin: 0; max-width: 60ch; }

@media (max-width: 760px) {
    .docs-list { grid-template-columns: 1fr; }
    .docs-pager { grid-template-columns: 1fr; }
    .docs-pager-next { text-align: left; }
    .docs-cta { flex-direction: column; align-items: flex-start; }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
    background: var(--footer-bg);
    color: #9CA3AF;
    padding: 72px 0 0;
    border-top: 1px solid var(--line);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 56px;
}

.footer-brand p { font-size: .93rem; max-width: 300px; margin: 16px 0 0; }

.footer-col h4 {
    color: #F3F4F6;
    font-size: .82rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    margin-bottom: 18px;
}

.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 11px; }
.footer-col a { color: #9CA3AF; font-size: .93rem; }
.footer-col a:hover { color: #fff; }

.footer-bottom {
    border-top: 1px solid #1F2937;
    padding: 22px 24px;
}

.footer-bottom p { margin: 0; font-size: .84rem; }

@media (max-width: 780px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   Misc
   -------------------------------------------------------------------------- */

::selection { background: rgba(37, 99, 235, .22); }

/* --------------------------------------------------------------------------
   Dark theme refinements
   -------------------------------------------------------------------------- */

html[data-theme="dark"] { color-scheme: dark; }

[data-theme="dark"] .card:hover,
[data-theme="dark"] .docs-item:hover,
[data-theme="dark"] .docs-pager-link:hover { border-color: #31508A; }

[data-theme="dark"] .alert-success {
    background: rgba(16, 185, 129, .12);
    color: #6EE7B7;
    border-color: rgba(110, 231, 183, .3);
}

[data-theme="dark"] .alert-error {
    background: rgba(239, 68, 68, .12);
    color: #FCA5A5;
    border-color: rgba(252, 165, 165, .3);
}

[data-theme="dark"] .field-error { color: #F87171; }

[data-theme="dark"] ::selection { background: rgba(76, 141, 255, .35); }