:root {
    color-scheme: light;
    --bg: #f4f3ef;
    --panel: #ffffff;
    --text: #1b1a17;
    --muted: #6b6b64;
    --accent: #e05d3a;
    --ring: #d8d5cf;
    --shadow: 0 16px 40px rgba(17, 17, 17, 0.12);
}

body.dark {
    color-scheme: dark;
    --bg: #0f1115;
    --panel: #171a21;
    --text: #f5f3ee;
    --muted: #a0a4ad;
    --accent: #f5b645;
    --ring: #2a2f3a;
    --shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

* {
    box-sizing: border-box;
}

body {
    font-family: "Space Grotesk", sans-serif;
    background: radial-gradient(circle at top, rgba(224, 93, 58, 0.12), transparent 45%),
        radial-gradient(circle at bottom, rgba(245, 182, 69, 0.12), transparent 50%),
        var(--bg);
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 24px;
}

.container {
    width: min(560px, 100%);
    background: var(--panel);
    border: 1px solid var(--ring);
    border-radius: 20px;
    padding: 28px 26px 30px;
    box-shadow: var(--shadow);
    text-align: center;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 18px;
}

h1 {
    font-size: 28px;
    margin: 0;
    letter-spacing: -0.5px;
}

.toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 999px;
    border: 1px solid var(--ring);
    background: transparent;
    color: var(--text);
    padding: 6px 12px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.toggle-btn:hover {
    transform: translateY(-1px);
    border-color: var(--accent);
}

.toggle-icon {
    font-size: 16px;
}

.lotto-numbers {
    display: grid;
    gap: 14px;
    margin: 20px 0 26px;
}

.lotto-set {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

.set-label {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.4px;
    color: var(--muted);
    text-transform: uppercase;
    margin-right: 8px;
}

.number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--panel);
    border: 2px solid var(--ring);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 22px;
    font-weight: 700;
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.04);
}

#generate-5-btn {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--ring);
    box-shadow: none;
}

.secondary-btn:hover {
    border-color: var(--accent);
}

.controls {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

#generate-btn {
    padding: 12px 22px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    border: none;
    background: var(--accent);
    color: #1a1305;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: 0 10px 20px rgba(224, 93, 58, 0.25);
}

#generate-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 26px rgba(224, 93, 58, 0.3);
}

#generate-btn:active {
    transform: translateY(0);
}

@media (max-width: 520px) {
    .header {
        flex-direction: column;
    }

    h1 {
        font-size: 24px;
    }

    .number {
        width: 50px;
        height: 50px;
    }
}