:root {
    --bg-gradient: linear-gradient(135deg, #bb86fc 0%, #6200ea 100%);
    --card-bg: #fff;
    --card-bg-dark: #232323;
    --card-shadow: 0 8px 24px rgba(0,0,0,0.12);
    --accent: #ffb300;
    --loader-color: #6200ea;
    --button-bg: #6200ea;
    --button-hover-bg: #bb86fc;
    --button-text: #fff;
    --text-color: #222;
}

@media (prefers-color-scheme: dark) {
    :root {
        --card-bg: #232323;
        --text-color: #fff;
        --button-bg: #bb86fc;
        --button-text: #232323;
        --button-hover-bg: #6200ea;
    }
}

body {
    font-family: 'Inter', Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
    color: var(--text-color);
    background: var(--bg-gradient);
    transition: background 0.3s, color 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    width: 100%;
    padding: 0;
}

.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem 0 1.5rem 0;
    color: var(--text-color);
}

.hero-icon {
    font-size: 3.5rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
    display: block;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin: 0.5rem 0 0 0;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #555;
    margin-top: 0.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: 18px;
    box-shadow: var(--card-shadow);
    padding: 2.5rem 3rem;
    margin: 2.5rem 0;
    min-width: 380px;
    max-width: 650px;
    min-height: 180px;
    transition: background 0.3s, box-shadow 0.3s;
    position: relative;
}

@media (prefers-color-scheme: dark) {
    .card {
        background: var(--card-bg-dark);
    }
    .hero-subtitle {
        color: #bbb;
    }
}

#fact {
    font-size: 1.5rem;
    line-height: 1.6;
    margin: 0;
    opacity: 1;
    transform: scale(1);
    transition: opacity 0.3s, transform 0.3s;
}

#fact.fade-out {
    opacity: 0;
    transform: scale(0.95);
}

#fact.fade-in {
    opacity: 1;
    transform: scale(1.04);
    transition: opacity 0.3s, transform 0.3s;
}

button {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 0.85rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 0.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background-color 0.3s, transform 0.2s;
}

button:hover {
    background-color: var(--button-hover-bg);
    transform: scale(1.07);
}

.loader {
    border: 4px solid #eee;
    border-top: 4px solid var(--loader-color);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem auto;
    display: block;
}

.hidden {
    display: none;
}

@keyframes spin {
    0% { transform: rotate(0deg);}
    100% { transform: rotate(360deg);}
}

footer {
    margin-top: 2rem;
    font-size: 1rem;
    color: var(--text-color);
    text-align: center;
    padding-bottom: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

footer a {
    color: var(--button-bg);
    text-decoration: none;
    margin: 0 0.3rem;
    font-size: 1.1rem;
}

footer a:hover {
    text-decoration: underline;
}

.footer-social {
    margin-top: 0.3rem;
    font-size: 1.3rem;
}

@media (max-width: 600px) {
    .card {
        padding: 1.2rem 1rem;
        min-width: 0;
        max-width: 95vw;
    }
    .hero h1 {
        font-size: 2.1rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
}

#fact-container {
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: var(--container-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--container-shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
}

#fact {
    font-size: 1.5rem;
    line-height: 1.6;
}

button {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

button:hover {
    background-color: var(--button-hover-bg);
    transform: scale(1.05);
}

footer {
    margin-top: 2rem;
    font-size: 0.9rem;
}

footer a {
    color: var(--button-bg);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}