@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --color-background: #0A0A0A; /* Slightly darker than #111 for deeper black */
    --color-surface: #1A1A1A; /* For cards or distinct sections */
    --color-text-primary: #F5F5F7;
    --color-text-secondary: #A1A1A6;
    --color-text-muted: #6E6E73;
    --color-accent: #007AFF; /* Apple's classic blue */
    --color-accent-hover: #0056b3;
    --color-border: #333333; /* Subtle borders */

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    
    --border-radius-small: 4px;
    --border-radius-medium: 8px;
    --border-radius-large: 16px;

    --spacing-unit: 8px;
    --container-max-width: 1100px;
    --section-padding-y: calc(var(--spacing-unit) * 10); /* 80px */
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden; /* Prevent horizontal scroll */
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-primary);
    font-weight: 700;
    letter-spacing: -0.02em; /* Subtle tightening for headings */
    margin-bottom: calc(var(--spacing-unit) * 2);
}

h1 {
    font-size: 3.5rem; /* 56px */
    font-weight: 800;
    line-height: 1.1;
}

h2 {
    font-size: 2.5rem; /* 40px */
    line-height: 1.2;
    margin-bottom: calc(var(--spacing-unit) * 4);
}

h3 {
    font-size: 1.75rem; /* 28px */
    line-height: 1.3;
}

p {
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-text-secondary);
    font-size: 1.125rem; /* 18px */
    max-width: 70ch; /* Optimal line length for readability */
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

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

/* Utility Classes */
.container {
    width: 90%;
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: calc(var(--spacing-unit) * 2);
    padding-right: calc(var(--spacing-unit) * 2);
}

.section {
    padding-top: var(--section-padding-y);
    padding-bottom: var(--section-padding-y);
    position: relative; /* For potential pseudo-elements or absolute positioning */
}

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

.text-accent {
    color: var(--color-accent);
}

.sr-only { /* For accessibility */
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Button Styling (Inspired by Apple/Shadcn) */
.btn {
    display: inline-block;
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-background);
    background-color: var(--color-accent);
    border: 1px solid var(--color-accent);
    border-radius: var(--border-radius-medium);
    text-align: center;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out, transform 0.1s ease-in-out;
    text-decoration: none;
}

.btn:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    text-decoration: none;
    color: var(--color-background);
}

.btn:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
    background-color: rgba(0, 122, 255, 0.1); /* Subtle hover for secondary */
    color: var(--color-accent);
}

/* Header Styling */
.site-header {
    padding: calc(var(--spacing-unit) * 2.5) 0; /* 20px */
    background-color: var(--color-background); /* Or slightly transparent: rgba(10, 10, 10, 0.8); */
    position: sticky;
    top: 0;
    z-index: 1000;
    /* backdrop-filter: blur(10px); */ /* For frosted glass, if browser supports well */
    border-bottom: 1px solid var(--color-border); /* Subtle separator */
}

.header-content {
    display: flex;
    justify-content: space-between; /* Changed to space-between for potential nav items */
    align-items: center;
}

.logo {
    font-size: 1.75rem; /* 28px */
    font-weight: 700;
    color: var(--color-text-primary);
    text-decoration: none;
    letter-spacing: -0.03em;
}

.logo:hover {
    color: var(--color-accent);
    text-decoration: none;
}

/* If navigation links were added */
/*
.site-header nav {
    display: flex;
    gap: calc(var(--spacing-unit) * 3);
}

.site-header nav a {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    transition: color 0.2s ease;
}

.site-header nav a:hover,
.site-header nav a.active {
    color: var(--color-text-primary);
}
*/

/* Hero Section Styling */
.hero-section {
    min-height: 85vh; /* Make it tall, but not full viewport height to encourage scrolling */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    overflow: hidden; /* Important for background effects */
    position: relative; /* For the background pattern */
    background: linear-gradient(135deg, #0D0D0D 25%, #1A1A1A 100%); /* Darker, subtle gradient */
}

.hero-title {
    font-size: 4.5rem; /* 72px */
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 2);
    line-height: 1.1;
    letter-spacing: -0.04em; /* Even tighter for very large text */
    animation: fadeInDown 1s ease-out forwards;
}

.hero-subtitle {
    font-size: 1.5rem; /* 24px */
    color: var(--color-text-secondary);
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: calc(var(--spacing-unit) * 4); /* More space before a potential CTA */
    animation: fadeInUp 1s ease-out 0.5s forwards;
    opacity: 0; /* Start hidden for animation */
}

.desktop-only { display: none; } /* Hide by default */
@media (min-width: 768px) {
    .desktop-only { display: block; } /* Show on larger screens */
    .hero-title { font-size: 5.5rem; } /* Larger on desktop */
    .hero-subtitle { font-size: 1.75rem; }
}


.hero-cta {
    margin-top: calc(var(--spacing-unit) * 3);
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
    font-size: 1.125rem;
    animation: fadeInUp 1s ease-out 1s forwards;
    opacity: 0; /* Start hidden for animation */
}

/* Subtle background pattern - e.g., animated dots or lines */
.hero-background-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1; /* Behind content */
    /* Example: Subtle animated dot grid */
    background-image: 
        radial-gradient(circle at 1px 1px, rgba(255,255,255,0.05) 1px, transparent 0);
    background-size: 30px 30px; /* Adjust size of grid */
    animation: panBackground 120s linear infinite;
    opacity: 0.5; /* Make it very subtle */
}

@keyframes panBackground {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}

@keyframes fadeInDown {
    0% {
        opacity: 0;
        transform: translateY(-30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Introduction Section Styling */
.introduction-section {
    background-color: var(--color-background); /* Same as body or slightly different if needed */
    padding-top: calc(var(--section-padding-y) * 1.2);
    padding-bottom: calc(var(--section-padding-y) * 1.2);
}

.section-title { /* General class for section titles */
    margin-bottom: calc(var(--spacing-unit) * 1.5); /* Less space if there's a subtitle */
    font-size: 2.8rem; /* 44.8px */
    font-weight: 700;
}

.section-subtitle { /* General class for section subtitles or lead paragraphs */
    font-size: 1.25rem; /* 20px */
    color: var(--color-text-secondary);
    max-width: 800px; /* Wider for centered subtitles */
    margin-left: auto;
    margin-right: auto;
    margin-bottom: calc(var(--spacing-unit) * 5); /* More space after subtitle */
    line-height: 1.7;
}

.introduction-section .section-subtitle {
     max-width: 750px; /* Slightly narrower for this specific section */
}

.inventu-link {
    font-weight: 500;
    /* color: var(--color-accent); */ /* Already handled by general 'a' styling */
    /* text-decoration: underline; */
    /* text-decoration-thickness: 1px; */ /* Subtle underline */
    /* text-underline-offset: 3px; */
}

.inventu-link:hover {
    /* color: var(--color-accent-hover); */
    text-decoration-thickness: 2px;
}


/* Capabilities Section Styling */
.capabilities-section {
    background-color: var(--color-surface); /* Slightly different background for this section */
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 4); /* 32px */
    margin-top: calc(var(--spacing-unit) * 6); /* Space after subtitle */
}

.capability-card {
    background-color: var(--color-background); /* Cards on the surface color */
    padding: calc(var(--spacing-unit) * 3.5); /* 28px */
    border-radius: var(--border-radius-large); /* More pronounced rounding */
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); /* Softer, more diffused shadow */
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    display: flex;
    flex-direction: column;
}

.capability-card:hover {
    transform: translateY(-6px); /* Slightly more lift */
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2); /* Deeper shadow on hover */
    border-color: rgba(0, 122, 255, 0.4); /* Slightly stronger accent border */
}

/* Focus visible states for accessibility */
a:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.3); /* Subtle glow effect */
}
.capability-card:focus-within { /* If card itself could be focused or contains focusable elements */
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-color: rgba(0, 122, 255, 0.5);
}


/* Subtle glow on accent text hover/focus */
.text-accent:hover,
.text-accent:focus-visible {
    text-shadow: 0 0 8px rgba(0, 122, 255, 0.5);
}
.inventu-link:hover, .inventu-link:focus-visible {
    text-shadow: 0 0 6px rgba(0, 122, 255, 0.4);
}
.logo:hover, .logo:focus-visible {
    text-shadow: 0 0 8px rgba(0, 122, 255, 0.3);
}


/* Reduced motion preferences */
@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;
  }
  .hero-background-pattern {
    animation: none; /* Disable background pan */
  }
  .hero-title, .hero-subtitle, .hero-cta {
      animation: none; /* Disable fade in animations */
      opacity: 1; /* Ensure they are visible */
      transform: none;
  }
}

.card-icon {
    margin-bottom: calc(var(--spacing-unit) * 2.5); /* 20px */
    color: var(--color-accent);
}

.card-icon svg {
    width: 40px; /* Adjust icon size */
    height: 40px;
    stroke-width: 1.5; /* Thinner lines for icons often look more modern */
}

.capability-card .card-title { /* Specific h3 styling for cards */
    font-size: 1.375rem; /* 22px */
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 1.5); /* 12px */
    font-weight: 600;
}

.capability-card .card-description {
    font-size: 1rem; /* 16px */
    color: var(--color-text-secondary);
    line-height: 1.6;
    flex-grow: 1; /* Ensures cards in a row have similar perceived height if text length varies */
    margin-bottom: 0; /* Remove default p margin */
}


/* Vision Section Styling */
.vision-section {
    background: linear-gradient(rgba(10, 10, 10, 0.9), rgba(10, 10, 10, 0.95)), 
                url('https://images.unsplash.com/photo-1518770660439-4636190af475?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1770&q=80') no-repeat center center;
    background-size: cover;
    background-attachment: fixed; /* Parallax-like effect */
    color: var(--color-text-primary); /* Ensure text is light on dark bg */
    padding-top: calc(var(--section-padding-y) * 1.5);
    padding-bottom: calc(var(--section-padding-y) * 1.5);
}

.vision-section .section-title {
    color: var(--color-text-primary); /* Override if needed */
    font-size: 3rem; /* Slightly larger for emphasis */
}

.vision-section .vision-subtitle {
    font-size: 1.35rem; /* 21.6px */
    color: var(--color-text-secondary); /* Light gray on dark */
    max-width: 850px;
    margin-bottom: calc(var(--spacing-unit) * 5);
}

.vision-section .vision-subtitle .text-accent {
    font-weight: 600;
}

.vision-highlight {
    margin-top: calc(var(--spacing-unit) * 5);
    padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 2);
    background-color: rgba(30, 30, 30, 0.5); /* Semi-transparent dark background */
    border-left: 4px solid var(--color-accent);
    border-radius: var(--border-radius-medium);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.vision-highlight p {
    font-size: 1.25rem; /* 20px */
    font-style: italic;
    color: var(--color-text-primary);
    margin-bottom: 0;
    line-height: 1.6;
}

/* Footer Styling */
.site-footer-main {
    background-color: var(--color-background); /* Consistent with body or header */
    padding: calc(var(--spacing-unit) * 5) 0; /* 40px */
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.site-footer-main .footer-text {
    font-size: 0.95rem; /* 15.2px */
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-unit);
}

.site-footer-main .footer-text .inventu-link {
    color: var(--color-text-secondary); /* Slightly more prominent than muted text */
    font-weight: 500;
}

.site-footer-main .footer-text .inventu-link:hover {
    color: var(--color-accent);
}

.site-footer-main .footer-tagline {
    font-size: 0.875rem; /* 14px */
    color: var(--color-text-muted);
    margin-bottom: 0;
}

/* Responsive Design Adjustments */
@media (max-width: 1024px) {
    :root {
        --section-padding-y: calc(var(--spacing-unit) * 8); /* 64px */
    }

    h1 { font-size: 3rem; } /* 48px */
    .hero-title { font-size: 3.5rem; } /* Adjust hero specifically */
    h2, .section-title { font-size: 2.25rem; } /* 36px */
    h3 { font-size: 1.5rem; } /* 24px */
    p, .section-subtitle { font-size: 1.05rem; } /* ~17px */
    .hero-subtitle { font-size: 1.3rem; } /* Adjust hero specifically */

    .capabilities-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: calc(var(--spacing-unit) * 3); /* 24px */
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding-y: calc(var(--spacing-unit) * 7); /* 56px */
    }
    
    .site-header .container {
        /* Allow logo and potential nav to stack if needed, though current design is simple */
        /* flex-direction: column; 
           align-items: flex-start; 
           gap: var(--spacing-unit); */
    }

    .hero-section {
        min-height: 75vh;
    }

    .hero-title {
        font-size: 2.8rem; /* Further reduce for mobile */
    }
    .hero-subtitle {
        font-size: 1.2rem; /* Further reduce for mobile */
    }

    h1 { font-size: 2.5rem; } /* 40px */
    h2, .section-title { font-size: 2rem; } /* 32px */
    h3, .capability-card .card-title { font-size: 1.25rem; } /* 20px */
    p, .section-subtitle { font-size: 1rem; } /* 16px */

    .section-subtitle {
        max-width: 90%; /* Allow more width on smaller screens */
    }

    .capabilities-grid {
        grid-template-columns: 1fr; /* Stack cards on mobile */
        gap: calc(var(--spacing-unit) * 3); /* 24px */
    }

    .capability-card {
        padding: calc(var(--spacing-unit) * 3); /* 24px */
    }
    
    .vision-section {
      background-attachment: scroll; /* Parallax can be jerky on mobile */
    }

    .vision-section .section-title { font-size: 2.25rem; }
    .vision-section .vision-subtitle { font-size: 1.1rem; }
    .vision-highlight p { font-size: 1.1rem; }

    .btn {
        padding: calc(var(--spacing-unit) * 1.25) calc(var(--spacing-unit) * 2.5);
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding-y: calc(var(--spacing-unit) * 6); /* 48px */
    }
    
    .hero-title {
        font-size: 2.2rem;
        letter-spacing: -0.03em;
    }
    .hero-subtitle {
        font-size: 1.1rem;
    }

    h1 { font-size: 2rem; }
    h2, .section-title { font-size: 1.75rem; }
    h3, .capability-card .card-title { font-size: 1.15rem; }
    p { font-size: 0.95rem; } /* ~15px */
    .section-subtitle { font-size: 1rem; }

    .container {
        width: 95%; /* More screen real-estate on very small devices */
    }
}

/* End of file marker for safety, can be removed */

</style.css>