:root {
    --font-family: 'Inter', 'Segoe UI', Roboto, sans-sarif;
    --color-primary: #0d6efd;
    --color-text: #222;
    --color-bg: #f5f6f8;
    --color-footer-bg: #333;
    --color-footer-text: #fff;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --max-width: 1200px;
}

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

html, body {
    width: 100%;
    height: 100%;
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
}

body {
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
}

main {
    padding: var(--spacing-lg);
    max-width: var(--max-width);
    margin: 0 auto;
}

nav {
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    left: 0;
}

nav .upper {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: #fff;
    border-bottom: 1px solid #ddd;
}

nav .lower {
    background-color: #fff;
    padding: var(--spacing-sm);
}

nav .name {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

a {
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary);
}

footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: var(--spacing-lg);
    font-size: 0.9rem;
}

footer a {
    color: white;
}

main form {
    display: flex;
    flex-direction: column;
}

#toast {
    position: fixed;
    left: 50%;
    transform: translateX(-50%) translateY(0px);
    background-color: rgba(50, 50, 50, 0.9);
    color: #fff;
    padding: 12px 18px;
    border-radius: 8px;
    font-size: 0.95rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease, transform 0.4s ease;
    z-index: 1000;
}

#toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(30px);
    pointer-events: auto;
}

@media (min-width: 700px) {
    nav {
        position: relative;
    }
}