:root {
    --sapphire: #1553C7;
    --powder-blue: #A1C6EA;
    --columbia-blue: #BBD1EA;
    --rich-black: #07020D;
    --arylide-yellow: #F0DD5F;
    --text-color: #000000;
    --background-light: #F5F8FF;
    --card-border: rgba(17, 24, 39, 0.08);
    --nav-height: 72px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background: #FFFFFF;
}

img {
    display: block;
    width: 100%;
    height: auto;
}

main {
    overflow-x: clip;
    overflow-y: visible;
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(17, 24, 39, 0.05);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 72px;
}

.nav-logo a {
    text-decoration: none;
    color: var(--sapphire);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 0.03em;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 24px;
}

.nav-link {
    text-decoration: none;
    color: var(--rich-black);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--sapphire);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--rich-black);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.section {
    padding: 120px 0;
}

.section:first-of-type {
    padding-top: 160px;
}

.section-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    margin-bottom: 48px;
}

.hero .section-header {
    text-align: center;
    margin-bottom: 56px;
}

.hero-title {
    font-size: clamp(2.5rem, 4vw + 1rem, 4.5rem);
    color: var(--sapphire);
    font-weight: 700;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 2vw + 0.8rem, 2.3rem);
    color: var(--columbia-blue);
    font-weight: 500;
}

.section-title {
    font-size: clamp(2rem, 2.4vw + 1rem, 3rem);
    color: var(--rich-black);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.section-subtitle {
    margin-top: 4px;
    font-size: clamp(1.2rem, 1.3vw + 0.9rem, 1.7rem);
    color: var(--columbia-blue);
    font-weight: 600;
}

.section-content {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.two-column {
    flex-direction: row;
    align-items: flex-start;
    gap: 60px;
    flex-wrap: nowrap;
}

.two-column .section-copy {
    flex: 1 1 55%;
}

.two-column .section-media {
    flex: 1 1 40%;
    max-width: 480px;
}

.single-column {
    flex-direction: column;
}

.section-copy h3,
.section-copy h4,
.highlight-list h3 {
    color: var(--sapphire);
    font-weight: 600;
    margin-bottom: 16px;
}

.section-copy ul,
.section-copy ol {
    padding-left: 20px;
    display: grid;
    gap: 12px;
}

.section-copy ul + h4 {
    margin-top: 32px;
}

.section-copy p {
    margin-bottom: 20px;
    font-size: 1.05rem;
}

.section-copy strong {
    color: var(--rich-black);
    font-weight: 600;
}

.feature-list {
    margin-top: 32px;
}

.section-copy ul li,
.section-copy ol li {
    font-size: 1.05rem;
}

.highlight-list ol {
    list-style: decimal;
}

.section-media {
    max-width: 520px;
    margin: 0;
}

.single-column .section-media {
    margin: 0 auto;
}

.section-media.sticky {
    position: sticky;
    top: calc(var(--nav-height) + 48px);
    align-self: flex-start;
}

.section-media figure {
    display: grid;
    gap: 16px;
}

.section-media img {
    border-radius: 20px;
}

.section-media figcaption {
    font-size: 0.9rem;
    color: var(--powder-blue);
    text-align: center;
}

.section-media.full-width {
    max-width: none;
    margin-top: 40px;
}

.section-media.full-width img {
    border-radius: 16px;
}

.section-media.full-width figcaption {
    margin-top: 12px;
}

.section-copy ul li::marker {
    color: var(--sapphire);
}

.section-copy ol li::marker {
    color: var(--arylide-yellow);
    font-weight: 600;
}

.section:nth-of-type(odd) {
    background: #FFFFFF;
}

.section:nth-of-type(even) {
    background: var(--background-light);
}

.section.hero {
    background: linear-gradient(160deg, rgba(21, 83, 199, 0.08) 0%, rgba(161, 198, 234, 0.12) 40%, rgba(255, 255, 255, 0.8) 100%);
}

ul + p:last-child {
    margin-top: 1.5em;
}

ul + p {
    margin-top: 1em;
}

.site-footer {
    background: var(--sapphire);
    color: var(--arylide-yellow);
    padding: 16px 0;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
    font-size: 0.9rem;
    line-height: 1.4;
}

.mobile-only {
    display: none;
}

@media (max-width: 1024px) {
    .two-column {
        flex-direction: column;
    }

    .two-column .section-media {
        max-width: 520px;
        margin: 0 auto;
    }

    .section-media.sticky > * {
        position: static;
    }
}

@media (max-width: 1150px) {
    .nav-menu {
        position: fixed;
        inset: 72px 0 auto 0;
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        box-shadow: 0 30px 60px rgba(17, 24, 39, 0.08);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: translateY(6px) rotate(45deg);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
    }
}

@media (max-width: 768px) {
    .mobile-only {
        display: inline;
    }
    
    .section {
        padding: 96px 0;
    }

    .section:first-of-type {
        padding-top: 140px;
    }
}

@media (max-width: 480px) {
    .mobile-only {
        display: inline;
    }

    .section {
        padding: 80px 0;
    }

    .section-inner {
        padding: 0 18px;
    }

    .section-copy p,
    .section-copy ul li,
    .section-copy ol li {
        font-size: 1rem;
    }

    .section-media img {
        border-radius: 16px;
    }
}