:root {
    --clr-background: #f4f6fb;
    --clr-surface: #ffffff;
    --clr-surface-subtle: #f9faff;
    --clr-accent: #355dff;
    --clr-accent-soft: #e4e9ff;
    --clr-text: #1d2433;
    --clr-text-muted: #5a6577;
    --radius-lg: 20px;
    --radius-md: 14px;
    --radius-sm: 10px;
    --shadow-soft: 0 20px 45px rgba(32, 56, 117, 0.08);
    --shadow-hover: 0 28px 60px rgba(25, 45, 120, 0.14);
}

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

html {
    font-size: 100%;
}

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
    line-height: 1.6;
    color: var(--clr-text);
    background-color: var(--clr-background);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
}

body::selection {
    color: #fff;
    background-color: var(--clr-accent);
}

img {
    max-width: 100%;
    display: block;
}

.page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: min(1080px, 92%);
    margin: 0 auto;
}

.hero {
    background: linear-gradient(140deg, var(--clr-surface-subtle) 0%, #e7ecfb 100%);
    padding: clamp(4rem, 8vw, 6.5rem) 0 clamp(3rem, 6vw, 5rem);
    position: relative;
    transition: box-shadow 200ms ease;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top left, rgba(53, 93, 255, 0.12), transparent 55%);
    pointer-events: none;
    z-index: 0;
}

.hero > .container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: clamp(1.5rem, 3vw, 2rem);
    align-items: flex-start;
}

.eyebrow {
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.18em;
    color: var(--clr-text-muted);
    font-weight: 600;
}

.hero h1 {
    font-size: clamp(2.4rem, 4vw, 3.5rem);
    line-height: 1.15;
    max-width: 640px;
    margin: 0;
}

.lead {
    max-width: 600px;
    font-size: clamp(1.05rem, 1.4vw, 1.25rem);
    color: var(--clr-text-muted);
    margin: 0;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

a.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    border: 1px solid transparent;
    transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease, border-color 150ms ease;
}

.btn-primary {
    background-color: var(--clr-accent);
    color: #fff;
    box-shadow: 0 18px 35px rgba(53, 93, 255, 0.28);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background-color: var(--clr-accent-soft);
    color: var(--clr-accent);
    border-color: rgba(53, 93, 255, 0.26);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    background-color: rgba(53, 93, 255, 0.18);
}

main {
    flex: 1 0 auto;
}

.section {
    padding: clamp(3.5rem, 7vw, 6rem) 0;
}

.section-header {
    display: grid;
    gap: 0.75rem;
    max-width: 620px;
}

.section-heading {
    font-size: clamp(2rem, 3vw, 2.6rem);
    margin: 0;
}

.section-lead {
    margin: 0;
    font-size: 1.1rem;
    color: var(--clr-text-muted);
}

.feature-grid {
    margin-top: clamp(2.5rem, 5vw, 3.5rem);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: clamp(1.5rem, 4vw, 2.5rem);
}

.feature-card {
    background-color: var(--clr-surface);
    border-radius: var(--radius-lg);
    padding: clamp(2rem, 4vw, 2.5rem);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    border: 1px solid rgba(53, 93, 255, 0.08);
    transition: transform 150ms ease, box-shadow 150ms ease;
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.feature-card h3 {
    margin: 0;
    font-size: 1.5rem;
}

.feature-subhead {
    margin: 0;
    color: var(--clr-text-muted);
}

.feature-card h4 {
    margin: 0;
    font-size: 0.9rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--clr-text-muted);
}

.feature-card ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.65rem;
}

.feature-card li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--clr-text);
}

.feature-card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55rem;
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background-color: var(--clr-accent);
    box-shadow: 0 0 0 6px rgba(53, 93, 255, 0.18);
    transform: translateY(-50%);
}

.demo {
    background: linear-gradient(140deg, #f7f9ff 0%, #edf1ff 90%);
}

.demo-wrapper {
    display: grid;
    gap: clamp(2rem, 4vw, 3rem);
}

.demo-card {
    background-color: var(--clr-surface);
    border-radius: var(--radius-lg);
    padding: clamp(2rem, 4vw, 2.6rem);
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(53, 93, 255, 0.08);
    display: grid;
    gap: 1.5rem;
}

.demo-card h3 {
    margin: 0;
    font-size: 1.6rem;
}

.demo-card .title {
    margin: 0;
    color: var(--clr-text-muted);
    font-size: 1rem;
}

.contact-info {
    display: grid;
    gap: 0.5rem;
    font-size: 1.05rem;
}

.demo-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

footer {
    padding: clamp(2.5rem, 6vw, 3.5rem) 0;
    text-align: center;
    color: var(--clr-text-muted);
}

footer p {
    margin: 0.35rem 0;
}

body[data-scrolled="true"] .hero {
    box-shadow: 0 22px 60px rgba(32, 56, 117, 0.14);
}

body[data-scrolled="true"] .hero::after {
    opacity: 0.6;
}

@media (max-width: 720px) {
    .hero-actions {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }

    a.btn {
        width: 100%;
    }

    .feature-card {
        padding: clamp(1.75rem, 6vw, 2.2rem);
    }

    .demo-card {
        padding: clamp(1.75rem, 6vw, 2.25rem);
    }
}

@media (max-width: 480px) {
    .container {
        width: min(96%, 520px);
    }

    .hero h1 {
        font-size: clamp(2.1rem, 9vw, 2.6rem);
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}


/* Centered variant for demo card */
.demo-card.center { text-align: center; align-items: center; }
.demo-card.center .demo-links { justify-content: center; }