/* ═══════════════════════════════════════════════════════════════
   IIInfrastructure Design System
   Professional B2B Authority · Light Theme · Blue Palette
   ═══════════════════════════════════════════════════════════════ */

/* ─── Google Fonts ─── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ─── Design Tokens ─── */
:root {
    /* Primary Blues */
    --navy:       #0f172a;
    --navy-90:    #1e293b;
    --slate:      #334155;
    --slate-light:#64748b;
    --royal:      #2563eb;
    --royal-dark: #1d4ed8;
    --royal-light:#3b82f6;
    --sky:        #0ea5e9;
    --sky-light:  #38bdf8;

    /* Neutrals */
    --white:      #ffffff;
    --off-white:  #f8fafc;
    --gray-50:    #f1f5f9;
    --gray-100:   #e2e8f0;
    --gray-200:   #cbd5e1;
    --gray-300:   #94a3b8;
    --gray-400:   #64748b;
    --gray-500:   #475569;

    /* Accent */
    --emerald:    #059669;
    --emerald-bg: #ecfdf5;
    --amber:      #d97706;
    --amber-bg:   #fffbeb;
    --red:        #dc2626;
    --red-bg:     #fef2f2;

    /* Typography */
    --font-main:  'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono:  'JetBrains Mono', monospace;

    /* Shadows */
    --shadow-sm:  0 1px 2px rgba(0,0,0,0.05);
    --shadow-md:  0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
    --shadow-card:0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-hover:0 10px 25px rgba(37,99,235,0.12), 0 4px 10px rgba(0,0,0,0.06);

    /* Layout */
    --max-w:      1200px;
    --max-w-narrow: 800px;
    --radius:     12px;
    --radius-sm:  8px;
    --radius-lg:  16px;
}

/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    color: var(--slate);
    background: var(--white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--royal); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--royal-dark); }

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

/* ─── Container ─── */
.container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 2rem;
}

.container-narrow {
    max-width: var(--max-w-narrow);
    margin: 0 auto;
    padding: 0 2rem;
}

/* ═══════════════════════════════════════════
   NAVIGATION
   ═══════════════════════════════════════════ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-100);
    transition: all 0.3s;
}

.nav.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.nav-logo img {
    height: 36px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--slate);
    font-size: 0.88rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--royal);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--royal);
    color: var(--white) !important;
    padding: 0.55rem 1.35rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.nav-cta:hover {
    background: var(--royal-dark);
    color: var(--white) !important;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Mobile nav */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--slate);
    border-radius: 2px;
    transition: all 0.3s;
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 1.5rem 2rem 2rem;
        border-bottom: 1px solid var(--gray-100);
        box-shadow: var(--shadow-lg);
        gap: 1rem;
    }
    .nav-links.open { display: flex; }
}


/* ═══════════════════════════════════════════
   HERO SECTION
   ═══════════════════════════════════════════ */
.hero {
    padding: 10rem 0 5rem;
    background: linear-gradient(180deg, var(--off-white) 0%, var(--white) 100%);
    text-align: center;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 900;
    line-height: 1.15;
    color: var(--navy);
    max-width: 800px;
    margin: 0 auto 1.5rem;
    letter-spacing: -0.03em;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, var(--royal), var(--sky));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 1.15rem;
    color: var(--slate-light);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    line-height: 1.75;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--royal);
    color: var(--white);
    padding: 0.9rem 2.2rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 700;
    transition: all 0.25s;
    box-shadow: 0 4px 14px rgba(37,99,235,0.3);
    border: none;
    cursor: pointer;
}

.hero-cta:hover {
    background: var(--royal-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37,99,235,0.35);
}

.hero-cta-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--royal);
    padding: 0.9rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.2s;
    margin-left: 0.75rem;
}

.hero-cta-secondary:hover {
    color: var(--royal-dark);
}

.trust-strip {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    margin-top: 3.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--gray-100);
    flex-wrap: wrap;
}

.trust-item {
    text-align: center;
}

.trust-val {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--navy);
}

.trust-label {
    font-size: 0.75rem;
    color: var(--gray-400);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 0.15rem;
}

@media (max-width: 768px) {
    .hero { padding: 8rem 0 3.5rem; }
    .hero h1 { font-size: 2.1rem; }
    .hero-sub { font-size: 1rem; }
    .trust-strip { gap: 1.5rem; }
}


/* ═══════════════════════════════════════════
   SECTION SYSTEM
   ═══════════════════════════════════════════ */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--off-white);
}

.section-accent {
    background: linear-gradient(135deg, #eef2ff, #f0f9ff);
}

.section-dark {
    background: var(--navy);
    color: var(--white);
}

.section-dark h2,
.section-dark h3 {
    color: var(--white);
}

.section-dark p,
.section-dark li {
    color: var(--gray-200);
}

.section-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--royal);
    margin-bottom: 0.75rem;
}

.section-dark .section-tag {
    color: var(--sky-light);
}

.section h2 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--navy);
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 0.6rem;
}

.section-lead {
    font-size: 1.05rem;
    color: var(--slate-light);
    max-width: 650px;
    line-height: 1.75;
    margin-bottom: 2.5rem;
}

@media (max-width: 768px) {
    .section { padding: 3.5rem 0; }
    .section h2 { font-size: 1.7rem; }
}


/* ═══════════════════════════════════════════
   CARDS
   ═══════════════════════════════════════════ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.card-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
    .card-grid-2,
    .card-grid-3 { grid-template-columns: 1fr; }
}

.card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius);
    padding: 2rem;
    transition: all 0.3s;
}

.card:hover {
    border-color: var(--gray-200);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #eef2ff, #dbeafe);
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 0.5rem;
}

.card p {
    font-size: 0.88rem;
    color: var(--slate-light);
    line-height: 1.65;
}

/* Numbered cards */
.card-numbered {
    position: relative;
    padding-left: 4.5rem;
}

.card-num {
    position: absolute;
    left: 2rem;
    top: 2rem;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--royal);
    opacity: 0.15;
    font-family: var(--font-mono);
}


/* ═══════════════════════════════════════════
   COMPARISON / SPLIT
   ═══════════════════════════════════════════ */
.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .split { grid-template-columns: 1fr; }
}

.split-bad {
    background: var(--red-bg);
    border: 1px solid #fecaca;
    border-radius: var(--radius);
    padding: 2rem;
}

.split-bad h3 { color: var(--red); }

.split-good {
    background: var(--emerald-bg);
    border: 1px solid #a7f3d0;
    border-radius: var(--radius);
    padding: 2rem;
}

.split-good h3 { color: var(--emerald); }

.split-bad ul,
.split-good ul {
    list-style: none;
    padding: 0;
    margin-top: 1rem;
}

.split-bad li,
.split-good li {
    font-size: 0.88rem;
    padding: 0.35rem 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.55;
}

.split-bad li::before {
    content: '✕';
    position: absolute;
    left: 0;
    color: var(--red);
    font-weight: 700;
    font-size: 0.8rem;
}

.split-good li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--emerald);
    font-weight: 700;
    font-size: 0.8rem;
}


/* ═══════════════════════════════════════════
   PULL QUOTE / CALLOUT
   ═══════════════════════════════════════════ */
.callout {
    background: linear-gradient(135deg, #eef2ff, #f0f9ff);
    border-left: 4px solid var(--royal);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 2rem 2.5rem;
    margin: 2.5rem 0;
}

.callout p {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--navy);
    line-height: 1.7;
    font-style: italic;
}

.callout-source {
    font-size: 0.8rem;
    color: var(--slate-light);
    font-style: normal;
    margin-top: 0.75rem;
    font-weight: 600;
}

/* Highlight box */
.highlight-box {
    background: var(--amber-bg);
    border: 1px solid #fde68a;
    border-radius: var(--radius);
    padding: 1.5rem 2rem;
    margin: 1.5rem 0;
}

.highlight-box h4 {
    color: var(--amber);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.5rem;
}

.highlight-box p {
    font-size: 0.9rem;
    color: var(--slate);
    line-height: 1.6;
}


/* ═══════════════════════════════════════════
   CTA SECTION
   ═══════════════════════════════════════════ */
.cta-section {
    text-align: center;
    padding: 5rem 0;
    background: var(--navy);
    color: var(--white);
}

.cta-section h2 {
    color: var(--white);
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.cta-section p {
    color: var(--gray-200);
    font-size: 1rem;
    max-width: 550px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--white);
    color: var(--navy);
    padding: 1rem 2.5rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 700;
    transition: all 0.25s;
    box-shadow: var(--shadow-lg);
    border: none;
    cursor: pointer;
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    color: var(--royal);
}

.cta-list {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.cta-list-item {
    font-size: 0.85rem;
    color: var(--gray-300);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.cta-list-item::before {
    content: '✓';
    color: var(--sky-light);
    font-weight: 700;
}


/* ═══════════════════════════════════════════
   FEATURE LIST (inline bullets)
   ═══════════════════════════════════════════ */
.feature-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}

.feature-list li {
    font-size: 0.92rem;
    color: var(--slate);
    padding: 0.55rem 0;
    padding-left: 2rem;
    position: relative;
    line-height: 1.6;
    border-bottom: 1px solid var(--gray-50);
}

.feature-list li:last-child { border-bottom: none; }

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.85rem;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--royal);
    opacity: 0.6;
}


/* ═══════════════════════════════════════════
   STEP / PROCESS FLOW
   ═══════════════════════════════════════════ */
.step-flow {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin: 2.5rem 0;
    counter-reset: step;
    position: relative;
}

@media (max-width: 768px) {
    .step-flow { grid-template-columns: 1fr; }
}

.step {
    padding: 2rem;
    text-align: center;
    position: relative;
    counter-increment: step;
}

.step::before {
    content: counter(step);
    display: flex;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--royal);
    color: var(--white);
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.9rem;
    margin: 0 auto 1rem;
}

.step h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 0.4rem;
}

.step p {
    font-size: 0.85rem;
    color: var(--slate-light);
    line-height: 1.5;
}


/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */
.footer {
    background: var(--navy-90);
    color: var(--gray-300);
    padding: 3rem 0 2rem;
}

.footer-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-logo img { height: 28px; opacity: 0.8; }

.footer-copy {
    font-size: 0.78rem;
    color: var(--gray-400);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--gray-400);
    transition: color 0.2s;
}

.footer-links a:hover { color: var(--white); }


/* ═══════════════════════════════════════════
   ARTICLE / CONTENT ENGINE COMPONENTS
   (Ready for future articles & resources)
   ═══════════════════════════════════════════ */

/* Prose styling for articles */
.prose {
    max-width: 720px;
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--slate);
}

.prose h1 { font-size: 2.5rem; color: var(--navy); margin: 2rem 0 1rem; font-weight: 800; }
.prose h2 { font-size: 1.7rem; color: var(--navy); margin: 2.5rem 0 0.75rem; font-weight: 700; }
.prose h3 { font-size: 1.3rem; color: var(--navy); margin: 2rem 0 0.5rem; font-weight: 700; }
.prose p  { margin-bottom: 1.25rem; }
.prose ul, .prose ol { margin-bottom: 1.25rem; padding-left: 1.5rem; }
.prose li { margin-bottom: 0.4rem; }
.prose blockquote {
    border-left: 3px solid var(--royal);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--slate-light);
    font-style: italic;
}
.prose img {
    border-radius: var(--radius);
    margin: 1.5rem 0;
    box-shadow: var(--shadow-md);
}
.prose figure {
    margin: 2rem 0;
}
.prose figcaption {
    font-size: 0.8rem;
    color: var(--gray-400);
    text-align: center;
    margin-top: 0.5rem;
}

/* Persona tags */
.persona-tag {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    margin-right: 0.35rem;
}

.persona-ceo  { background: #dbeafe; color: #1e40af; }
.persona-cfo  { background: #d1fae5; color: #065f46; }
.persona-cto  { background: #e0e7ff; color: #3730a3; }
.persona-vps  { background: #fef3c7; color: #92400e; }
.persona-mkt  { background: #fce7f3; color: #9d174d; }
.persona-ops  { background: #f3e8ff; color: #6b21a8; }

/* Journey stage badges */
.journey-badge {
    display: inline-block;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
}

.journey-awareness   { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }
.journey-consideration { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }
.journey-decision    { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }

/* Video container */
.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 */
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--navy);
    margin: 2rem 0;
    box-shadow: var(--shadow-lg);
}

.video-container video,
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Chart container */
.chart-container {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: var(--shadow-card);
}

.chart-container h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 1rem;
}

.chart-container .chart-source {
    font-size: 0.72rem;
    color: var(--gray-400);
    margin-top: 0.75rem;
    font-style: italic;
}

/* Article card (for resource grid) */
.article-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.3s;
    text-decoration: none;
    display: block;
}

.article-card:hover {
    border-color: var(--gray-200);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.article-card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--gray-50);
}

.article-card-body {
    padding: 1.5rem;
}

.article-card-meta {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.75rem;
}

.article-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 0.4rem;
    line-height: 1.3;
}

.article-card p {
    font-size: 0.82rem;
    color: var(--slate-light);
    line-height: 1.55;
}


/* ═══════════════════════════════════════════
   ANIMATIONS
   ═══════════════════════════════════════════ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Smooth bounce for CTA */
@keyframes gentle-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}