@font-face {
    font-family: 'Atkinson Hyperlegible';
    src: url('fonts/AtkinsonHyperlegibleNext-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Atkinson Hyperlegible';
    src: url('fonts/AtkinsonHyperlegibleNext-Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

:root {
    --color-background: #0d1117;
    --color-surface: #161b22;
    --color-border: #30363d;
    --color-text-primary: #e6edf3;
    --color-text-secondary: #8b949e;
    --color-accent: #58a6ff;
    --color-success: #3fb950;
    --color-error: #f85149;
    --font-primary: 'Atkinson Hyperlegible', system-ui, sans-serif;
    --border-radius: 8px;
    --shadow-elevated: 0 8px 24px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    line-height: 1.6;
}

.palindrome-checker {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-elevated);
    padding: 2.5rem;
    width: 100%;
    max-width: 480px;
    text-align: center;
}

.palindrome-checker__decoration {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    opacity: 0.4;
}

.palindrome-checker__decoration span:last-child {
    transform: scaleX(-1);
}

.palindrome-checker__title {
    font-family: var(--font-primary);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.palindrome-checker__description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.palindrome-checker__form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.palindrome-checker__input {
    font-family: var(--font-primary);
    font-size: 1rem;
    padding: 0.875rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.palindrome-checker__input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.palindrome-checker__input::placeholder {
    color: var(--color-text-secondary);
}

.palindrome-checker__submit {
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 700;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    background-color: var(--color-accent);
    color: var(--color-background);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.palindrome-checker__submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.3);
}

.palindrome-checker__submit:active {
    transform: translateY(0);
}

.palindrome-checker__result {
    font-size: 1.1rem;
    padding: 1rem;
    border-radius: var(--border-radius);
    min-height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.palindrome-checker__result:empty {
    background-color: transparent;
}

.palindrome-checker__result--success {
    background-color: rgba(63, 185, 80, 0.15);
    color: var(--color-success);
    border: 1px solid rgba(63, 185, 80, 0.3);
}

.palindrome-checker__result--failure {
    background-color: rgba(248, 81, 73, 0.15);
    color: var(--color-error);
    border: 1px solid rgba(248, 81, 73, 0.3);
}

@media (max-width: 500px) {
    .palindrome-checker {
        padding: 1.5rem;
    }

    .palindrome-checker__title {
        font-size: 1.75rem;
    }
}