:root {
    color-scheme: light;
    --bg: #eef2f6;
    --bg-accent: #ffffff;
    --panel: #ffffff;
    --text: #1b1e25;
    --muted: #4b5668;
    --border: #e2e8f0;
    --shadow: 0 18px 45px rgba(18, 38, 63, 0.12);
    --primary: #2563eb;
    --primary-soft: rgba(37, 99, 235, 0.18);
    --button-secondary: #f2f5f9;
    --ball-base: #f1f4f8;
}

[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0f172a;
    --bg-accent: #101b31;
    --panel: #111827;
    --text: #eef2ff;
    --muted: #b0bdd2;
    --border: #253047;
    --shadow: 0 18px 45px rgba(2, 6, 23, 0.45);
    --primary: #60a5fa;
    --primary-soft: rgba(96, 165, 250, 0.25);
    --button-secondary: #1f2937;
    --ball-base: #1f2937;
}

* {
    box-sizing: border-box;
}

body {
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: radial-gradient(circle at top, var(--bg-accent), var(--bg));
    margin: 0;
    color: var(--text);
}

.container {
    width: min(720px, 92vw);
    text-align: center;
    padding: 28px 22px 32px;
    background: var(--panel);
    border-radius: 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

h1 {
    margin: 0 0 8px;
    font-size: 28px;
    letter-spacing: -0.5px;
}

p {
    margin: 0 0 18px;
    color: var(--muted);
    font-size: 14px;
}

.controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

label {
    font-size: 14px;
    color: var(--muted);
}

input[type="number"] {
    width: 80px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: transparent;
    color: var(--text);
}

input[type="number"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-soft);
}

button {
    padding: 10px 16px;
    font-size: 14px;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.1s ease, box-shadow 0.2s ease, background 0.2s ease;
}

#generate-btn {
    background: linear-gradient(135deg, var(--primary), #1d4ed8);
    color: #ffffff;
    box-shadow: 0 8px 16px rgba(47, 128, 237, 0.25);
}

#clear-btn {
    background: var(--button-secondary);
    color: var(--text);
}

#theme-btn {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

button:hover {
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

.lotto-numbers {
    display: grid;
    gap: 10px;
}

.lotto-row {
    padding: 10px 14px;
    background: rgba(148, 163, 184, 0.12);
    border-radius: 10px;
    font-weight: 600;
    color: var(--text);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.lotto-label {
    min-width: 64px;
    font-size: 14px;
    color: var(--muted);
}

.lotto-balls {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.lotto-ball {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: var(--text);
    background: var(--ball-base);
    box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.08);
}

.lotto-ball[data-range="1"] {
    background: #fde68a;
}

.lotto-ball[data-range="2"] {
    background: #bfdbfe;
}

.lotto-ball[data-range="3"] {
    background: #bbf7d0;
}

.lotto-ball[data-range="4"] {
    background: #fecaca;
}

.lotto-ball[data-range="5"] {
    background: #e9d5ff;
}

@media (max-width: 480px) {
    h1 {
        font-size: 24px;
    }

    .controls {
        gap: 8px;
    }

    .lotto-row {
        font-size: 14px;
    }
}