:root {
    --color-speedons-blue: #0078D7;
    --color-speedons-dark-blue: #005A9E;
    --color-speedons-darker-blue: #004780;
    --color-speedons-orange: #FF9900;
    --color-speedons-light-orange: #FFB347;
    --color-speedons-pale-orange: #FFE8CC;
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-text: #333333;
    --color-text-dark: #1a1a1a;
    --spacing-sm: 10px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --spacing-xl: 40px;
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-monospace: 'Courier New', Consolas, monospace;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    --shadow-strong: 0 10px 30px rgba(0, 0, 0, 0.3);
    --shadow-button: 0 4px 12px rgba(255, 153, 0, 0.5);
    --shadow-button-hover: 0 6px 20px rgba(0, 0, 0, 0.4);
    --transition: 0.3s ease;
    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 16px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    position: relative;
    min-height: 100vh;
    font-family: var(--font-primary);
    line-height: 1.9;
    color: var(--color-text);
    background: var(--color-speedons-blue);
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 700;
    color: var(--color-white);
    background: var(--color-speedons-orange);
    border-radius: 0 0 var(--radius) 0;
    text-decoration: none;
    z-index: 100;
    transition: top var(--transition);
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--color-white);
    outline-offset: 2px;
}

#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    height: 100vh;
    padding: var(--spacing-xl) 25px;
    background-color: var(--color-speedons-dark-blue);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.4);
    overflow-y: auto;
}

#navbar header {
    margin-bottom: 35px;
    padding-bottom: 25px;
    font-size: 1.7rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--color-white);
    border-bottom: 4px solid var(--color-speedons-orange);
}

#navbar::-webkit-scrollbar {
    width: var(--spacing-sm);
}

#navbar::-webkit-scrollbar-track {
    background: var(--color-speedons-darker-blue);
    border-radius: 5px;
}

#navbar::-webkit-scrollbar-thumb {
    background: var(--color-speedons-orange);
    border-radius: 5px;
}

#navbar::-webkit-scrollbar-thumb:hover {
    background: var(--color-speedons-light-orange);
}

.navigation-link {
    display: block;
    margin-bottom: var(--spacing-sm);
    padding: 14px 18px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    border-left: 4px solid transparent;
    border-radius: var(--spacing-sm);
    text-decoration: none;
    transition: all var(--transition);
}

.navigation-link:hover,
.navigation-link:focus,
.navigation-link.active {
    color: var(--color-white);
    background-color: var(--color-speedons-orange);
    border-left-color: var(--color-white);
    box-shadow: var(--shadow-button);
    transform: translateX(8px);
    outline: none;
}

#main-doc {
    max-width: 1100px;
    margin-left: 300px;
    padding: 60px 80px 100px;
}

.main-section {
    margin-bottom: var(--spacing-xl);
    padding: 50px 55px;
    background-color: var(--color-white);
    border-top: 6px solid var(--color-speedons-orange);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-strong);
}

.main-section header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--color-speedons-blue);
    border-bottom: 4px solid var(--color-speedons-orange);
}

.main-section h3 {
    margin: var(--spacing-lg) 0 var(--spacing-md);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-speedons-dark-blue);
}

.main-section h3:first-of-type {
    margin-top: 0;
}

.main-section p {
    margin-bottom: var(--spacing-md);
    font-size: 1.08rem;
    line-height: 2;
    text-align: justify;
    color: var(--color-text);
}

.main-section p:first-of-type {
    font-size: 1.12rem;
    font-weight: 500;
    color: var(--color-text-dark);
}

code {
    padding: 3px 8px;
    font-family: var(--font-monospace);
    font-size: 0.95em;
    font-weight: 600;
    color: var(--color-speedons-dark-blue);
    background-color: var(--color-speedons-pale-orange);
    border: 2px solid var(--color-speedons-orange);
    border-radius: var(--radius-sm);
}

ul {
    margin: 25px 0 25px var(--spacing-lg);
    padding-left: var(--spacing-sm);
}

li {
    margin-bottom: 15px;
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--color-text);
}

li strong {
    font-weight: 700;
    color: var(--color-speedons-orange);
}

p + ul {
    margin-top: var(--spacing-md);
}

ul + p {
    margin-top: 25px;
}

.back-to-top-button {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-white);
    background-color: var(--color-speedons-orange);
    border-radius: 50%;
    box-shadow: var(--shadow);
    text-decoration: none;
    z-index: 50;
    transition: all var(--transition);
    will-change: transform;
}

.back-to-top-button:hover,
.back-to-top-button:focus {
    background-color: var(--color-speedons-light-orange);
    box-shadow: var(--shadow-button-hover);
    transform: translateY(-5px);
    outline: 3px solid var(--color-white);
    outline-offset: 2px;
}

*:focus-visible {
    outline: 3px solid var(--color-speedons-orange);
    outline-offset: 2px;
}

@media (max-width: 768px) {
    #navbar {
        position: relative;
        width: 100%;
        height: auto;
        padding: 25px var(--spacing-md);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    }
    #navbar header {
        margin-bottom: 25px;
        font-size: 1.5rem;
        text-align: center;
    }
    .navigation-link {
        font-size: 0.95rem;
        text-align: center;
    }
    .navigation-link:hover,
    .navigation-link:focus,
    .navigation-link.active {
        transform: translateX(0);
    }
    #main-doc {
        margin-left: 0;
        padding: var(--spacing-lg) var(--spacing-md) 80px;
    }
    .main-section {
        margin-bottom: var(--spacing-lg);
        padding: var(--spacing-lg) 25px;
    }
    .main-section header {
        font-size: 1.8rem;
    }
    .main-section h3 {
        font-size: 1.3rem;
    }
    .main-section p {
        font-size: 1.02rem;
        line-height: 1.8;
    }
    .main-section p:first-of-type {
        font-size: 1.05rem;
    }
    li {
        font-size: 1rem;
    }
    .back-to-top-button {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 45px;
        height: 45px;
        font-size: 1.5rem;
    }
    .skip-link {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
}

@media print {
    :root {
        --color-speedons-blue: #000;
        --color-speedons-orange: #000;
    }
    body {
        background: white;
        color: black;
    }
    #navbar,
    .back-to-top-button,
    .skip-link {
        display: none;
    }
    #main-doc {
        margin-left: 0;
        padding: 0;
        max-width: 100%;
    }
    .main-section {
        margin-bottom: var(--spacing-md);
        border: 1px solid #ccc;
        box-shadow: none;
        page-break-inside: avoid;
    }
    a {
        color: black;
        text-decoration: underline;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}