/* Global Variables */
:root {
    /* Colors */
    --color-1: #00171F;
    --color-2: #003459;
    --color-3: #007EA7;
    --color-4: #00A8E8;
    --color-white: #FFFFFF;
    
    /* Functional Colors */
    --primary-color: var(--color-3);
    --secondary-color: var(--color-2);
    --text-color: var(--color-1);
    --bg-color: var(--color-white);
    --gray-light: #f3f4f6;
    --gray-dark: var(--color-2);
    
    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.4rem;
    --spacing-sm: 0.8rem;
    --spacing-md: 1.6rem;
    --spacing-lg: 2.4rem;
    --spacing-xl: 3.2rem;
    
    /* Container */
    --container-width: 120rem;
    --container-padding: 2rem;
}

html, body {
    height: 100%;
}

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

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 4.8rem;
}

h2 {
    font-size: 3.6rem;
}

h3 {
    font-size: 2.4rem;
}

p {
    margin-bottom: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1.2rem 2.5rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    letter-spacing: 0.5px;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-4), var(--color-3));
    color: var(--color-white);
    box-shadow: 0 4px 15px rgba(0, 168, 232, 0.3);
}

.btn--primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 168, 232, 0.4);
}

.btn--secondary {
    background: transparent;
    color: var(--color-4);
    border: 2px solid var(--color-4);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn--secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(135deg, var(--color-4), var(--color-3));
    transition: width 0.3s ease;
    z-index: -1;
}

.btn--secondary:hover {
    color: var(--color-white);
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 168, 232, 0.4);
}

.btn--secondary:hover::before {
    width: 100%;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

/* Flexbox Utilities */
.flex {
    display: flex;
}

.flex-center {
    justify-content: center;
    align-items: center;
}

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

/* Margin Utilities */
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* Padding Utilities */
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

/* Scroll to Top Button */
.scroll-top {
    position: fixed;
    bottom: 3rem;
    right: 3rem;
    width: 4.5rem;
    height: 4.5rem;
    background-color: var(--color-4);
    color: var(--color-1);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(1rem);
    transition: all 0.3s ease;
    z-index: 1000;
}

.scroll-top.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    background-color: var(--color-3);
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
    .scroll-top {
        bottom: 2rem;
        right: 2rem;
        width: 4rem;
        height: 4rem;
        font-size: 1.8rem;
    }
}