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

:root {
    /* Premium Color Palette */
    --clr-bg: #FFFFFF;
    --clr-bg-surface: #FAFAFA;
    --clr-border: rgba(0, 0, 0, 0.06);
    --clr-border-focus: rgba(0, 0, 0, 0.15);
    
    /* Text Colors */
    --clr-text-main: #111827;
    --clr-text-muted: #6B7280;
    --clr-text-light: #9CA3AF;
    
    /* Accents */
    --clr-primary: #111827; /* Dark charcoal/black for primary buttons (Apple/Linear style) */
    --clr-primary-hover: #000000;
    --clr-accent: #F59E0B; /* Subtle Amber for highlights/icons */
    --clr-white: #FFFFFF;

    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Spacing Map */
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-5: 1.5rem;   /* 24px */
    --space-6: 2rem;     /* 32px */
    --space-8: 3rem;     /* 48px */
    --space-10: 4rem;    /* 64px */
    --space-12: 6rem;    /* 96px */
    --space-16: 8rem;    /* 128px */
    --space-20: 10rem;   /* 160px */
    
    /* Shadows - Stripe/Vercel style */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.04), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    --shadow-hover: 0 20px 40px -4px rgba(0, 0, 0, 0.08);
    
    /* Borders & Radii */
    --radius-sm: 0.375rem; /* 6px */
    --radius-md: 0.5rem;   /* 8px */
    --radius-lg: 1rem;     /* 16px */
    --radius-xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout Constraints */
    --max-width: 1200px;
}

/* Base Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--clr-text-main);
    background-color: var(--clr-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--clr-text-main);
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(2rem, 4.5vw, 3rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }

p {
    color: var(--clr-text-muted);
    font-size: 1.125rem; /* 18px standard body */
    line-height: 1.7;
}

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

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

/* Layout Utilities */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--space-5);
}

.section {
    padding-block: var(--space-16);
}
.section-sm {
    padding-block: var(--space-10);
}
.section-lg {
    padding-block: var(--space-20);
}

.bg-surface { background-color: var(--clr-bg-surface); }
.bg-dark { background-color: var(--clr-primary); color: var(--clr-white); }
.bg-dark h2, .bg-dark h3, .bg-dark p { color: inherit; }
.bg-dark p { color: var(--clr-text-light); }

.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 992px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .section { padding-block: var(--space-10); }
    .section-sm { padding-block: var(--space-6); }
    .section-lg { padding-block: var(--space-12); }
}

.text-center { text-align: center; }
.highlight { color: var(--clr-accent); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    line-height: 1.5;
    text-align: center;
}

.btn-primary {
    background-color: var(--clr-primary);
    color: var(--clr-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--clr-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--clr-text-main);
    border-color: var(--clr-border-focus);
}

.btn-outline:hover {
    background-color: var(--clr-bg-surface);
    border-color: var(--clr-text-main);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: 1.125rem;
}

/* Accessibility Focus */
*:focus-visible {
    outline: 2px solid var(--clr-accent);
    outline-offset: 2px;
}

/* Glass Header Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    border-bottom: 1px solid var(--clr-border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.logo-dot {
    width: 6px;
    height: 6px;
    background-color: var(--clr-accent);
    border-radius: var(--radius-full);
    display: inline-block;
    vertical-align: middle;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--clr-text-muted);
}

.nav-link:hover, .nav-link.active {
    color: var(--clr-text-main);
}

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--clr-text-main);
    cursor: pointer;
    padding: var(--space-2);
}

@media (max-width: 768px) {
    .menu-toggle { display: block; }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--clr-white);
        border-bottom: 1px solid var(--clr-border);
        flex-direction: column;
        padding: var(--space-6) var(--space-5);
        gap: var(--space-4);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all var(--transition-base);
        box-shadow: var(--shadow-md);
    }
    
    .nav-links.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-links .btn {
        width: 100%;
        margin-top: var(--space-2);
    }
}

/* Hero Generic Styling */
.hero-subtitle {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--clr-accent);
    margin-bottom: var(--space-4);
}

/* Premium Card (Linear/Apple style) */
.card {
    background-color: var(--clr-white);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    transition: all var(--transition-base);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--clr-border-focus);
    transform: translateY(-2px);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--clr-bg-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-5);
    color: var(--clr-text-main);
}
.card-icon svg { width: 24px; height: 24px; }

.card h3 {
    margin-bottom: var(--space-3);
    font-size: 1.25rem;
}

.card p {
    font-size: 1rem;
    margin-bottom: 0;
    flex-grow: 1;
}

/* Image Utilities */
.img-rounded {
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--clr-border);
}

/* Forms */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: inherit;
    font-size: 1rem;
    color: var(--clr-text-main);
    background-color: var(--clr-bg-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    background-color: var(--clr-white);
    border-color: var(--clr-text-main);
    box-shadow: inset 0 0 0 1px var(--clr-text-main);
}

/* Footer Global */
.footer {
    background-color: var(--clr-bg-surface);
    border-top: 1px solid var(--clr-border);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-nav {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-10);
    margin-bottom: var(--space-12);
}

.footer-brand p {
    margin-top: var(--space-4);
    font-size: 0.95rem;
    max-width: 320px;
}

.footer-heading {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-6);
    color: var(--clr-text-main);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-links a {
    color: var(--clr-text-muted);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--clr-text-main);
}

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--clr-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
}

@media (max-width: 992px) {
    .footer-nav { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 576px) {
    .footer-nav { grid-template-columns: 1fr; }
}

/* Micro Animations - Scroll Reveal */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.animate-on-scroll.fade-in-up-visible {
    opacity: 1;
    transform: translateY(0);
}