/* === IMPORTS === */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700;900&display=swap');

/* === CSS CUSTOM PROPERTIES === */
:root {
    /* Color Palette */
    --color-dark: #1C0F13;
    --color-slate: #6E7E85;
    --color-ash: #B7CECE;
    --color-pale: #BBBAC6;
    --color-lightest: #E2E2E2;
    
    /* Semantic Colors */
    --color-text-primary: #2a2a2a;
    --color-text-secondary: #6E7E85;
    --color-text-muted: #6E7E85;
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #E2E2E2;
    --color-bg-tertiary: #BBBAC6;
    
    /* Typography Scale */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;
    
    /* Font Weights */
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-black: 900;
    
    /* Spacing Scale (8px base) */
    --space-1: 0.5rem;
    --space-2: 1rem;
    --space-3: 1.5rem;
    --space-4: 2rem;
    --space-5: 2.5rem;
    --space-6: 3rem;
    --space-8: 4rem;
    --space-10: 5rem;
    --space-12: 6rem;
    --space-16: 8rem;
    --space-20: 10rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(28, 15, 19, 0.05);
    --shadow-md: 0 4px 6px rgba(28, 15, 19, 0.07);
    --shadow-lg: 0 8px 24px rgba(28, 15, 19, 0.08);
    --shadow-xl: 0 12px 40px rgba(28, 15, 19, 0.12);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-smooth: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index Scale */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-popover: 500;
    --z-tooltip: 600;
    
    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 2rem;
}

/* === RESET & BASE STYLES === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-bold);
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-6xl); }
h2 { font-size: var(--font-size-5xl); }
h3 { font-size: var(--font-size-2xl); }

p {
    line-height: 1.7;
    color: var(--color-text-secondary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
}

/* === LAYOUT === */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

section {
    position: relative;
    overflow: hidden;
}

/* === NAVIGATION === */
.nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    padding: var(--space-4) 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-lightest);
    transition: all var(--transition-base);
}

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

.logo {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-bold);
    color: var(--color-text-primary);
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: translateX(-2px);
}

.nav-links {
    display: flex;
    gap: var(--space-4);
    align-items: center;
}

.nav-links a {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    font-weight: var(--font-medium);
    position: relative;
    padding: var(--space-1) 0;
}

.nav-links a.btn {
    color: white;
    padding: var(--space-2) var(--space-4);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-slate);
    transition: width var(--transition-base);
}

.nav-links a.btn::after {
    display: none;
}

.nav-links a:hover::after {
    width: 100%;
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-base);
    font-weight: var(--font-medium);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--color-slate);
    color: white;
    position: relative;
    z-index: 1;
}

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

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

.btn-secondary:hover {
    background: var(--color-lightest);
    border-color: var(--color-slate);
}

.btn-large {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-lg);
}

.btn-small {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-sm);
}

/* === HERO SECTION === */
.hero {
    padding: var(--space-20) 0;
    text-align: center;
    background: linear-gradient(180deg, 
        var(--color-bg-primary) 0%, 
        var(--color-lightest) 100%
    );
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 20%, rgba(183, 206, 206, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: var(--z-base);
}

.hero h1 {
    margin-bottom: var(--space-3);
    animation: fadeInUp 0.8s ease;
}

.hero p {
    font-size: var(--font-size-xl);
    max-width: 700px;
    margin: 0 auto var(--space-6);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-cta {
    display: flex;
    gap: var(--space-2);
    justify-content: center;
    align-items: center;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-note {
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    animation: fadeInUp 0.8s ease 0.6s both;
}

/* === SECTION HEADERS === */
.section-header {
    text-align: center;
    margin-bottom: var(--space-10);
}

.section-header h2 {
    margin-bottom: var(--space-3);
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--color-slate);
}

.section-header p {
    font-size: var(--font-size-xl);
    max-width: 700px;
    margin: var(--space-4) auto 0;
}

/* === FEATURE CARDS === */
.features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

.feature {
    background: var(--color-bg-primary);
    padding: var(--space-5);
    border: 1px solid var(--color-lightest);
    position: relative;
    transition: all var(--transition-smooth);
    overflow: hidden;
}

.feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--color-slate);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.feature::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--color-slate), var(--color-ash));
    opacity: 0;
    z-index: -1;
    transition: opacity var(--transition-smooth);
}

.feature:hover {
    border-color: transparent;
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.feature:hover::before {
    opacity: 1;
}

.feature:hover::after {
    opacity: 0.1;
}

.feature-number {
    font-size: var(--font-size-sm);
    font-weight: var(--font-semibold);
    color: var(--color-slate);
    margin-bottom: var(--space-2);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.feature h3 {
    margin-bottom: var(--space-2);
    transition: color var(--transition-base);
}

.feature:hover h3 {
    color: var(--color-slate);
}

.feature p {
    font-size: var(--font-size-base);
    line-height: 1.7;
}

/* === GRID LAYOUTS === */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

/* === CTA SECTION === */
.cta-section {
    background: var(--color-dark);
    padding: var(--space-16) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(110, 126, 133, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.cta-section h2 {
    color: white;
    margin-bottom: var(--space-2);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto var(--space-4);
}

.cta-section .btn-primary {
    background: white;
    color: var(--color-dark);
}

.cta-section .btn-primary:hover {
    background: var(--color-lightest);
    transform: translateY(-3px);
}

.cta-note {
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

/* === FOOTER === */
.footer {
    padding: var(--space-8) 0;
    border-top: 1px solid var(--color-lightest);
    text-align: center;
    background: var(--color-bg-primary);
}

.footer p {
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
}

/* === ANIMATIONS === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* === UTILITIES === */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }

.bg-light { background: var(--color-lightest); }
.bg-pale { background: var(--color-pale); }
.bg-dark { background: var(--color-dark); }

.section-padding { padding: var(--space-16) 0; }
.section-padding-sm { padding: var(--space-12) 0; }
.section-padding-lg { padding: var(--space-20) 0; }

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
    :root {
        --container-padding: 1.5rem;
    }
    
    .features,
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
    
    .hero {
        padding: var(--space-16) 0;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --space-16: 4rem;
        --space-20: 6rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .hero {
        padding: var(--space-12) 0;
    }
    
    .hero h1 {
        font-size: var(--font-size-4xl);
    }
    
    .hero p {
        font-size: var(--font-size-lg);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .feature {
        padding: var(--space-4);
    }
    
    .section-header h2 {
        font-size: var(--font-size-4xl);
    }
    
    .section-header p {
        font-size: var(--font-size-base);
    }
    
    .cta-section {
        padding: var(--space-12) 0;
    }
    
    .cta-section h2 {
        font-size: var(--font-size-4xl);
    }
    
    .section-padding {
        padding: var(--space-8) 0;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }
    
    .btn {
        width: 100%;
    }
    
    .hero-cta {
        width: 100%;
    }
}

/* === PRINT STYLES === */
@media print {
    .nav,
    .cta-section,
    .footer {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
}