:root {
    --facts-bg: hsl(228, 38%, 9%);
    --facts-card: hsl(0, 0%, 100%);
    --facts-ink: hsl(228, 30%, 15%);
    --facts-muted: hsl(226, 18%, 42%);
    --facts-accent: hsl(266, 78%, 54%);
    --facts-accent-2: hsl(326, 78%, 58%);
    --facts-accent-soft: hsl(266, 80%, 97%);
    --facts-border: hsla(266, 55%, 55%, 0.25);
    --facts-gold: hsl(43, 92%, 60%);
    --facts-rad: 24px;
}

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

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Rubik", system-ui, sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: #fff;
    background: var(--facts-bg);
    display: grid;
    place-items: center;
    position: relative;
    overflow-x: hidden;
}

/* ---------- Animated starfield ---------- */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    background-image:
        radial-gradient(1px 1px at 20% 30%, rgba(255, 255, 255, 0.7), transparent 1px),
        radial-gradient(1px 1px at 70% 20%, rgba(255, 255, 255, 0.5), transparent 1px),
        radial-gradient(1.5px 1.5px at 40% 70%, rgba(255, 255, 255, 0.6), transparent 1.5px),
        radial-gradient(1px 1px at 85% 60%, rgba(255, 255, 255, 0.45), transparent 1px),
        radial-gradient(1px 1px at 55% 85%, rgba(255, 255, 255, 0.55), transparent 1px),
        radial-gradient(1.5px 1.5px at 15% 55%, rgba(255, 255, 255, 0.4), transparent 1.5px);
    pointer-events: none;
}

/* accent glows */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    background:
        radial-gradient(700px 400px at 80% -5%, hsla(266, 80%, 60%, 0.28), transparent 60%),
        radial-gradient(700px 400px at 8% 110%, hsla(326, 80%, 55%, 0.22), transparent 60%);
    pointer-events: none;
}

#facts-root {
    position: relative;
    z-index: 1;
    width: 100%;
    display: grid;
    place-items: center;
}

a {
    text-decoration: none;
}

/* ---------- Top bar ---------- */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 5;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(12, 14, 26, 0.55);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid hsla(266, 50%, 60%, 0.18);
}

.top-nav .back-link {
    font-size: 0.92rem;
    letter-spacing: 0.04em;
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.2s ease;
}

.top-nav .back-link:hover {
    color: #fff;
}

.top-nav .back-link::before {
    content: "←  ";
    font-weight: 600;
}

.top-nav .brand {
    font-family: "Fraunces", serif;
    font-style: italic;
    color: var(--facts-gold);
    letter-spacing: 0.02em;
}

/* ---------- Wrapper ---------- */
.card-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 620px;
    padding: 90px 20px 50px;
}

.page-kicker {
    text-transform: uppercase;
    letter-spacing: 0.28em;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--facts-accent);
    margin: 0 0 14px;
}

.page-title {
    font-family: "Fraunces", serif;
    font-weight: 600;
    font-size: clamp(2.2rem, 6vw, 3.2rem);
    line-height: 1.05;
    margin: 0 0 40px;
    text-align: center;
    background: linear-gradient(90deg, hsl(43, 92%, 62%), hsl(266, 80%, 70%));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ---------- Card ---------- */
.card {
    position: relative;
    width: 100%;
    padding: 44px 46px 38px;
    border-radius: var(--facts-rad);
    background: var(--facts-card);
    color: var(--facts-ink);
    border: 1px solid var(--facts-border);
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.02);
    text-align: center;
    overflow: hidden;
}

/* colorful accent bar on top of card */
.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--facts-accent), var(--facts-accent-2), var(--facts-gold));
}

/* soft inner glow */
.card::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(400px 200px at 50% -10%, hsla(266, 80%, 60%, 0.12), transparent 70%);
    pointer-events: none;
}

.card .card-body {
    position: relative;
    z-index: 1;
}

/* decorative quote mark */
.facts-quote {
    display: block;
    font-family: "Fraunces", serif;
    font-size: 4.5rem;
    line-height: 0.6;
    color: var(--facts-gold);
    margin-bottom: 18px;
    opacity: 0.9;
}

/* fact text - elegant serif */
.card p[data-fact-text] {
    margin: 0 0 20px;
    font-family: "Fraunces", serif;
    font-size: clamp(1.35rem, 3.5vw, 1.7rem);
    line-height: 1.5;
    font-weight: 400;
    overflow-wrap: break-word;
}

.card .fact-attribution {
    margin: 0;
    font-family: "Rubik", sans-serif;
    font-size: 0.82rem;
    color: var(--facts-muted);
    letter-spacing: 0.04em;
}

.card .fact-attribution::before {
    content: "— ";
}

/* ---------- Loading / error ---------- */
.state {
    width: 100%;
    text-align: center;
    padding: 60px 20px;
    color: rgba(255, 255, 255, 0.75);
    font-size: 1.05rem;
}

.state.is-hidden {
    display: none;
}

.is-hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 18px;
    border: 3px solid hsla(266, 80%, 60%, 0.25);
    border-top-color: var(--facts-gold);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- Button ---------- */
button {
    cursor: pointer;
    font-family: inherit;
    border: 0;
    outline: none;
}

button.new-fact {
    margin-top: 30px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 0.95rem;
    color: #fff;
    background: linear-gradient(120deg, var(--facts-accent), var(--facts-accent-2));
    padding: 15px 34px;
    border-radius: 40px;
    box-shadow: 0 10px 26px hsla(266, 64%, 42%, 0.45);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

button.new-fact .btn-icon {
    display: inline-flex;
    align-items: center;
    transition: transform 0.4s ease;
}

button.new-fact:hover {
    transform: translateY(-2px);
    filter: brightness(1.06);
    box-shadow: 0 14px 32px hsla(266, 64%, 42%, 0.55);
}

button.new-fact:hover .btn-icon {
    transform: rotate(180deg);
}

button.new-fact:active {
    transform: translateY(0);
}

button.new-fact:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ---------- Footer ---------- */
.card-footer {
    margin-top: 30px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.55);
    text-align: center;
}

@media (max-width: 520px) {
    .card { padding: 32px 24px 28px; }
    .card-container { padding-top: 100px; }
    .top-nav .brand { display: none; }
}