:root {
    /* Colors & Tonal Architecture */
    --background: #FFFFFF;
    --surface: #FAF9FE;
    --surface-container-low: #F4F3F8;
    --surface-container-highest: #E3E2E7;
    --surface-container-lowest: #FFFFFF;
    
    --primary-text: #000000;
    --secondary-text: #4B4B4B;
    --neutral-400: #A3A3A3;
    --neutral-500: #737373;
    
    --interactive-action: #000000;
    --outline-variant: rgba(207, 196, 197, 0.15); /* Ghost Border */
    
    /* Typography Scales */
    --font-family: 'Inter', sans-serif;
    
    --display-lg: 3.5rem;
    --headline-lg: 2rem;
    --body-lg: 1rem;
    --label-md: 0.75rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-massive: 8rem;
    
    /* Effects */
    --glass-blur: blur(20px);
    --glass-fill: rgba(255, 255, 255, 0.8);
    --ambient-shadow: 0px 24px 48px rgba(26, 27, 31, 0.06);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family);
    background-color: var(--background);
    color: var(--primary-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography Styles */
.display-lg {
    font-size: var(--display-lg);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.headline-lg {
    font-size: var(--headline-lg);
    font-weight: 700;
    letter-spacing: -0.01em;
}

.body-lg {
    font-size: var(--body-lg);
    color: var(--secondary-text);
}

.label-md {
    font-size: var(--label-md);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--neutral-400);
}

/* Layout Primitives */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.editorial-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-md);
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.problem-intro {
    grid-column: span 5;
}

.problem-grid {
    grid-column: span 7;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.problem-item {
    background: var(--surface);
    padding: 2rem;
    border-radius: 1rem;
}

.massive-margin {
    margin-bottom: var(--spacing-massive);
}

.section-padding {
    padding: var(--spacing-xl) 0;
}

/* Tonal Layering Utilities */
.bg-surface { background-color: var(--surface); }
.bg-surface-low { background-color: var(--surface-container-low); }
.bg-surface-lowest { background-color: var(--surface-container-lowest); }
.bg-dark { background-color: #000000; color: #FFFFFF; }

/* Components */
.nav-glass {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: var(--glass-fill);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--outline-variant);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1280px;
    margin: 0 auto;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    text-decoration: none;
    color: var(--primary-text);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary-text);
}

.nav-link {
    text-decoration: none;
    color: var(--secondary-text);
    font-size: 0.875rem;
    font-weight: 500;
    transition: opacity 0.2s;
}

.nav-link:hover {
    opacity: 0.7;
}

/* Hero Section */
.hero-section {
    padding-top: var(--spacing-massive);
    text-align: center;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-content {
    max-width: 850px;
    margin: 0 auto;
}

.hero-title {
    margin-top: 2rem;
    margin-bottom: 3rem;
}

.hero-subtitle {
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.hero-footer {
    margin-top: 6rem;
    padding-top: 2rem;
    border-top: 1px solid var(--surface-container-low);
}

/* Solution Section */
.solution-container {
    text-align: center;
}

.solution-title {
    font-size: 3rem;
    margin-bottom: 4rem;
}

.solution-list {
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
}

.solution-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.solution-icon {
    color: var(--primary-text);
    font-variation-settings: 'FILL' 1;
}

.solution-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

/* Bento Grid Items */
.bento-item {
    background: #111111;
    padding: 3rem;
    border-radius: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 320px;
    transition: transform 0.3s ease;
}

.bento-item:hover {
    transform: translateY(-5px);
}

.bento-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* Form Section */
.form-container {
    max-width: 600px;
    margin: 0 auto;
}

.form-header {
    text-align: center;
    margin-bottom: 4rem;
}

.form-glass {
    padding: 3rem;
    border-radius: 1.5rem;
}

.form-group {
    margin-bottom: 2.5rem;
}

.form-input {
    width: 100%;
    border: none;
    border-bottom: 2px solid var(--surface-container-highest);
    background: transparent;
    padding: 0.75rem 0;
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.form-input:focus {
    border-bottom-color: var(--primary-text);
}

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid var(--surface-container-low);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Buttons */
.btn-primary {
    background-color: var(--interactive-action);
    color: #FFFFFF;
    padding: 0.875rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 1s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }

.hero-reveal {
    animation: heroReveal 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes heroReveal {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive Overrides */
@media screen and (max-width: 1024px) {
    :root {
        --display-lg: 3rem;
        --spacing-massive: 6rem;
    }
    
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 768px) {
    :root {
        --display-lg: 2.5rem;
        --headline-lg: 1.75rem;
        --spacing-xl: 4rem;
        --spacing-massive: 5rem;
    }

    .editorial-grid {
        grid-template-columns: 1fr;
    }

    .problem-intro {
        grid-column: span 1;
        margin-bottom: 2rem;
    }

    .problem-grid {
        grid-column: span 1;
        grid-template-columns: 1fr; /* Stack to 1 column at tablet/mobile */
        gap: 2rem;
    }

    .bento-grid {
        grid-template-columns: 1fr; /* Stack to 1 column at tablet/mobile */
        gap: 2rem;
    }

    .solution-title {
        font-size: 2.25rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--glass-fill);
        backdrop-filter: var(--glass-blur);
        -webkit-backdrop-filter: var(--glass-blur);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--outline-variant);
        animation: slideDown 0.3s ease-out forwards;
    }

    .nav-links.active {
        display: flex;
    }
    
    @keyframes slideDown {
        from { opacity: 0; transform: translateY(-10px); }
        to { opacity: 1; transform: translateY(0); }
    }
    
    .mobile-menu-toggle {
        display: block;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn-large {
        width: 100%;
        justify-content: center;
    }

    .form-glass {
        padding: 1.5rem;
    }
    
    .hero-title br {
        display: none;
    }
    
    .bento-item {
        padding: 2rem;
        min-height: auto;
    }
}

@media screen and (max-width: 480px) {
    :root {
        --display-lg: 2rem;
        --headline-lg: 1.5rem;
        --spacing-md: 1.5rem;
    }
    
    .solution-title {
        font-size: 2rem;
    }
}