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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --bg-color: #fff;
    --section-bg: #f8f9fa;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

nav h1 {
    font-size: 1.5rem;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--secondary-color);
}

/* Sections */
.section {
    min-height: 100vh;
    padding: 100px 20px 60px;
    display: flex;
    align-items: center;
}

.section:nth-child(even) {
    background-color: var(--section-bg);
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.section p {
    font-size: 1.1rem;
    max-width: 800px;
}

/* Numeronym Diagram */
.numeronym-diagram {
    margin: 2rem 0;
    padding: 2rem;
    background-color: var(--bg-color);
    border-radius: 8px;
    border: 2px solid var(--secondary-color);
    max-width: 400px;
    font-family: 'Courier New', monospace;
}

.diagram-line {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
}

.letter-start,
.letter-end {
    color: var(--secondary-color);
    font-size: 2rem;
    padding: 0 0.5rem;
}

.letter-middle {
    color: #7f8c8d;
    margin: 0 0.5rem;
    letter-spacing: 0.2rem;
}

.diagram-arrows {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 1rem;
    color: var(--secondary-color);
}

.arrow-start,
.arrow-end {
    width: 3rem;
    text-align: center;
}

.arrow-middle {
    font-size: 0.9rem;
    padding: 0 0.5rem;
}

.diagram-result {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.result-text {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    background-color: var(--section-bg);
    padding: 0.5rem 1.5rem;
    border-radius: 4px;
}

/* Word Examples */
.word-example {
    white-space: nowrap;
}

.word-example .letter-start,
.word-example .letter-end {
    padding: 0;
    font-size: inherit;
}

.word-example .letter-middle {
    margin: 0;
    letter-spacing: normal;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1rem;
    }

    .section h2 {
        font-size: 2rem;
    }
}