/* ============================================
   Sentinel Holdings I LLC — Corporate Site
   Premium Visual Revision
   ============================================ */

:root {
    --navy: #0b1a2e;
    --navy-deep: #06101f;
    --charcoal: #1c2a3a;
    --steel: #64748b;
    --steel-light: #94a3b8;
    --silver: #cbd5e1;
    --off-white: #f1f5f9;
    --white: #ffffff;
    --border: #e2e8f0;
    --text-dark: #0f172a;
    --text-body: #334155;
    --text-muted: #64748b;
    --accent: #3b82f6;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-body);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5 {
    color: var(--text-dark);
    font-weight: 700;
    line-height: 1.25;
}
h1 { font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; }
p { margin-bottom: 1rem; }
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--navy); }

/* ---- Layout ---- */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}
.section {
    padding: 96px 0;
    position: relative;
}
.section-alt {
    background: var(--off-white);
}
.section-dark {
    background: var(--navy);
    color: var(--silver);
}
.section-dark h2, .section-dark h3 {
    color: var(--white);
}
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-sm { font-size: 0.9rem; }

.section-header {
    max-width: 680px;
    margin: 0 auto 56px;
    text-align: center;
}
.section-header p {
    color: var(--text-muted);
    margin-top: 12px;
    font-size: 1.05rem;
}
.label {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--accent);
    margin-bottom: 12px;
    padding: 4px 12px;
    background: rgba(59,130,246,0.08);
    border-radius: 4px;
}
.section-dark .label {
    color: #93bbfc;
    background: rgba(59,130,246,0.15);
}

/* ---- Header / Nav ---- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(6, 16, 31, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    transition: background 0.3s;
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.logo {
    text-decoration: none;
    display: flex;
    align-items: center;
}
.logo img {
    height: 36px;
    width: auto;
}
.footer-brand .logo img {
    height: 42px;
}
.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}
.nav-links a {
    color: var(--steel-light);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
}
.nav-links a:hover, .nav-links a.active {
    color: var(--white);
}
.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
}

/* Mobile nav */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--white);
    margin: 5px 0;
    transition: 0.3s;
}

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(6, 16, 31, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .nav-links.open { display: flex; }
}

/* ---- Hero (Homepage) ---- */
.hero {
    position: relative;
    min-height: 700px;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center 30%;
    background-repeat: no-repeat;
}
.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg,
        rgba(6,16,31,0.92) 0%,
        rgba(11,26,46,0.85) 40%,
        rgba(28,42,58,0.75) 100%
    );
}
.hero-inner {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    padding: 140px 0 100px;
    width: 100%;
}
.hero-content {
    position: relative;
}
.hero h1 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: clamp(2.2rem, 4.5vw, 3.4rem);
}
.hero p {
    color: var(--steel-light);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 32px;
}
.hero .label {
    color: #93bbfc;
    background: rgba(59,130,246,0.15);
}

/* Hero visual panel (right side) */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-visual-card {
    background: rgba(255,255,255,0.04);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 36px;
    width: 100%;
    max-width: 400px;
}
.hero-visual-card .stat-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.hero-visual-card .stat-row:last-child { border-bottom: none; }
.hero-visual-card .stat-icon {
    width: 40px;
    height: 40px;
    background: rgba(59,130,246,0.12);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    flex-shrink: 0;
}
.hero-visual-card .stat-label {
    font-size: 0.78rem;
    color: var(--steel-light);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.hero-visual-card .stat-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-top: 2px;
}

@media (max-width: 900px) {
    .hero-inner { grid-template-columns: 1fr; }
    .hero-visual { display: none; }
}

/* ---- Buttons ---- */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: all 0.25s;
    text-decoration: none;
}
.btn-primary {
    background: var(--accent);
    color: var(--white);
    box-shadow: 0 2px 8px rgba(59,130,246,0.2);
}
.btn-primary:hover {
    background: #2563eb;
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(59,130,246,0.35);
}
.btn-outline {
    background: rgba(255,255,255,0.06);
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.2);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.4);
    color: var(--white);
}

/* ---- Image Section (full-width band with text overlay) ---- */
.image-band {
    position: relative;
    padding: 120px 0;
    overflow: hidden;
}
.image-band-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}
.image-band-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(6,16,31,0.88) 0%, rgba(11,26,46,0.82) 50%, rgba(28,42,58,0.78) 100%);
}
.image-band .container {
    position: relative;
    z-index: 2;
}
.image-band h2 { color: var(--white); }
.image-band p { color: var(--steel-light); }
.image-band .label { color: #93bbfc; background: rgba(59,130,246,0.15); }

/* ---- Split image-text section ---- */
.split-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 480px;
}
.split-image {
    background-size: cover;
    background-position: center;
    position: relative;
}
.split-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 70%, var(--off-white) 100%);
}
.split-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 64px 56px;
    background: var(--off-white);
}
.split-content h2 { margin-bottom: 16px; }
.split-content p { color: var(--text-body); }
@media (max-width: 768px) {
    .split-section { grid-template-columns: 1fr; }
    .split-image { min-height: 280px; }
    .split-image::after { background: linear-gradient(180deg, transparent 60%, var(--off-white) 100%); }
    .split-content { padding: 40px 24px; }
}

/* ---- Cards / Grid ---- */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
@media (max-width: 900px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 36px 32px;
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
}
.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #1d4ed8);
    opacity: 0;
    transition: opacity 0.3s;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
}
.card:hover::before {
    opacity: 1;
}
.card-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(59,130,246,0.04));
    border: 1px solid rgba(59,130,246,0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 22px;
    color: var(--accent);
}
.card h3 { margin-bottom: 10px; }
.card p { color: var(--text-muted); font-size: 0.93rem; margin-bottom: 0; }

/* Dark cards */
.card-dark {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.07);
    backdrop-filter: blur(8px);
}
.card-dark::before {
    background: linear-gradient(90deg, rgba(59,130,246,0.4), rgba(59,130,246,0.1));
}
.card-dark:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(255,255,255,0.12);
    box-shadow: 0 12px 40px rgba(0,0,0,0.25);
}
.card-dark h3 { color: var(--white); }
.card-dark p { color: var(--steel-light); }
.card-dark .card-icon {
    background: linear-gradient(135deg, rgba(59,130,246,0.15), rgba(59,130,246,0.05));
    border-color: rgba(59,130,246,0.2);
    color: #93bbfc;
}

/* ---- Stat / Pillar Row ---- */
.pillars {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
}
.pillar {
    background: var(--white);
    padding: 40px 28px;
    text-align: center;
    position: relative;
}
.pillar::before {
    content: '';
    display: block;
    width: 32px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
    margin: 0 auto 20px;
    opacity: 0.6;
}
.pillar h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}
.pillar p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0;
}
@media (max-width: 768px) {
    .pillars { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .pillars { grid-template-columns: 1fr; }
}

/* ---- CTA Banner ---- */
.cta-banner {
    position: relative;
    border-radius: 16px;
    padding: 64px 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    overflow: hidden;
}
.cta-banner-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
}
.cta-banner-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(6,16,31,0.92) 0%, rgba(11,26,46,0.88) 50%, rgba(28,42,58,0.85) 100%);
}
.cta-banner > *:not(.cta-banner-bg) { position: relative; z-index: 2; }
.cta-banner h2 { color: var(--white); margin-bottom: 8px; font-size: 1.5rem; }
.cta-banner p { color: var(--steel-light); margin-bottom: 0; }
@media (max-width: 768px) {
    .cta-banner { flex-direction: column; text-align: center; padding: 48px 28px; }
}

/* ---- Page Hero (inner pages) ---- */
.page-hero {
    position: relative;
    padding: 150px 0 72px;
    overflow: hidden;
}
.page-hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center 30%;
}
.page-hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, rgba(6,16,31,0.94) 0%, rgba(11,26,46,0.9) 50%, rgba(28,42,58,0.85) 100%);
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { color: var(--white); margin-bottom: 12px; }
.page-hero p { color: var(--steel-light); font-size: 1.05rem; max-width: 600px; }
.page-hero .label { color: #93bbfc; background: rgba(59,130,246,0.15); }

/* ---- Content blocks ---- */
.content-block {
    max-width: 760px;
}
.content-block h2 {
    margin-bottom: 16px;
    font-size: 1.5rem;
}
.content-block h3 {
    margin-top: 32px;
    margin-bottom: 12px;
}
.content-block p {
    color: var(--text-body);
}
.content-block ul {
    padding-left: 20px;
    margin-bottom: 16px;
}
.content-block li {
    margin-bottom: 8px;
    color: var(--text-body);
}

/* ---- Two-col layout ---- */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}
.two-col.align-center { align-items: center; }
@media (max-width: 768px) {
    .two-col { grid-template-columns: 1fr; gap: 40px; }
}

/* ---- Inline image block ---- */
.img-block {
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}
.img-block img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.img-block-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(11,26,46,0.3) 0%, rgba(28,42,58,0.1) 100%);
}

/* ---- Entity cards ---- */
.entity-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px 32px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s, box-shadow 0.3s;
}
.entity-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(0,0,0,0.06);
}
.entity-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(59,130,246,0.03));
    border: 1px solid rgba(59,130,246,0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    flex-shrink: 0;
}
.entity-card h3 { font-size: 1rem; margin-bottom: 4px; }
.entity-card p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0; }

/* ---- Contact Form ---- */
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text-dark);
    background: var(--white);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
@media (max-width: 600px) {
    .form-row { grid-template-columns: 1fr; }
}

/* Contact info sidebar */
.contact-info {
    padding: 36px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.04);
}
.contact-info h3 { margin-bottom: 20px; }
.contact-item {
    display: flex;
    gap: 14px;
    margin-bottom: 20px;
}
.contact-item-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(59,130,246,0.03));
    border: 1px solid rgba(59,130,246,0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    flex-shrink: 0;
}
.contact-item p { font-size: 0.9rem; margin-bottom: 0; }
.contact-item strong { display: block; font-size: 0.85rem; color: var(--text-dark); margin-bottom: 2px; }

/* ---- Footer ---- */
.site-footer {
    background: var(--navy-deep);
    color: var(--steel);
    padding: 72px 0 0;
    position: relative;
}
.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(59,130,246,0.2), transparent);
}
.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
@media (max-width: 768px) {
    .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}
.footer-brand p {
    font-size: 0.88rem;
    color: var(--steel);
    max-width: 320px;
    line-height: 1.7;
}
.footer-col h4 {
    color: var(--white);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 18px;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a {
    color: var(--steel);
    font-size: 0.88rem;
    transition: color 0.2s;
    text-decoration: none;
}
.footer-col a:hover { color: var(--white); }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 0.8rem;
    color: var(--steel);
}
.footer-bottom a { color: var(--steel); }
.footer-bottom a:hover { color: var(--steel-light); }
@media (max-width: 600px) {
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}

/* ---- Divider ---- */
.divider {
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #1d4ed8);
    border-radius: 2px;
    margin: 20px 0;
}
.section-header .divider { margin: 16px auto; }

/* ---- Legal content ---- */
.legal-content {
    max-width: 760px;
}
.legal-content h2 {
    font-size: 1.3rem;
    margin-top: 40px;
    margin-bottom: 12px;
}
.legal-content h2:first-child { margin-top: 0; }
.legal-content p, .legal-content li {
    font-size: 0.93rem;
    color: var(--text-body);
}
.legal-content ul {
    padding-left: 20px;
    margin-bottom: 16px;
}
.legal-content li { margin-bottom: 6px; }

/* ---- Subtle geometric decoration ---- */
.geo-lines {
    position: absolute;
    top: 0;
    right: 0;
    width: 400px;
    height: 400px;
    opacity: 0.04;
    pointer-events: none;
    background:
        linear-gradient(45deg, transparent 48%, var(--accent) 49%, var(--accent) 51%, transparent 52%),
        linear-gradient(-45deg, transparent 48%, var(--accent) 49%, var(--accent) 51%, transparent 52%);
    background-size: 60px 60px;
}
.section-dark .geo-lines { opacity: 0.06; }

/* ---- Utility ---- */
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }

/* ---- Fade-in animations ---- */
.fade-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}
.fade-up-delay { transition-delay: 0.15s; }
.fade-up-delay-2 { transition-delay: 0.3s; }

/* ---- Subtle top-line accent on sections ---- */
.section-lined {
    position: relative;
}
.section-lined::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #1d4ed8);
    border-radius: 2px;
}