:root {
    color-scheme: dark;
    --bg-panel: rgba(10, 20, 38, 0.78);
    --bg-panel-strong: rgba(14, 27, 48, 0.96);
    --border-soft: rgba(255, 255, 255, 0.1);
    --text-main: #f8fbff;
    --text-muted: #9db2d1;
    --accent: #57a6ff;
    --shadow: 0 24px 80px rgba(2, 8, 23, 0.45);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text-main);
    background:
        radial-gradient(circle at top left, rgba(87, 166, 255, 0.22), transparent 28%),
        radial-gradient(circle at 85% 15%, rgba(158, 114, 255, 0.18), transparent 25%),
        radial-gradient(circle at bottom center, rgba(255, 92, 115, 0.12), transparent 30%),
        linear-gradient(135deg, #050b16 0%, #081322 45%, #0c1d35 100%);
    overflow-x: hidden;
}

body::before,
body::after {
    content: "";
    position: fixed;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.24;
    pointer-events: none;
    z-index: 0;
}

body::before {
    top: -80px;
    left: -120px;
    background: #2d6df6;
}

body::after {
    right: -120px;
    bottom: -80px;
    background: #7a39ff;
}

a {
    color: #8cc8ff;
    text-decoration: none;
}

a:hover {
    color: #c5e3ff;
}

.page-shell {
    position: relative;
    z-index: 1;
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 48px 0 36px;
}

.hero {
    position: relative;
    overflow: hidden;
    padding: 40px 48px;
    border-radius: 32px;
    background: linear-gradient(135deg, rgba(11, 24, 44, 0.9), rgba(14, 36, 69, 0.72));
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow);
    margin-bottom: 28px;
}

.hero::after {
    content: "";
    position: absolute;
    inset: auto -80px -120px auto;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(87, 166, 255, 0.28), transparent 68%);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: 10px 16px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #d7e9ff;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(12px);
}

.hero h1 {
    margin: 20px 0 0;
    font-size: clamp(34px, 6vw, 58px);
    line-height: 1.08;
    letter-spacing: -0.03em;
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.section {
    position: relative;
    overflow: hidden;
    padding: 28px;
    border-radius: 28px;
    background: var(--bg-panel);
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
}

.section::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent 28%);
    pointer-events: none;
}

.section-head {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: flex-start;
}

.eyebrow {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 14px;
    color: #e6f2ff;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

h2 {
    margin: 0;
    font-size: 30px;
    letter-spacing: -0.02em;
}

button {
    min-width: 132px;
    padding: 14px 22px;
    border: none;
    border-radius: 16px;
    background: linear-gradient(135deg, #63b3ff, #2d6df6 55%, #5f43ff);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 16px 32px rgba(45, 109, 246, 0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 38px rgba(45, 109, 246, 0.4);
    filter: brightness(1.05);
}

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

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.result-panel {
    position: relative;
    border-radius: 24px;
    padding: 24px 20px 20px;
    margin-top: 24px;
    background: var(--bg-panel-strong);
    border: 1px solid rgba(255, 255, 255, 0.06);
    min-height: 220px;
}

.status-text {
    margin: 0;
    font-size: 14px;
    color: var(--text-muted);
}

.balls {
    margin-top: 22px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
    min-height: 84px;
    position: relative;
}

.ball {
    position: relative;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    color: #fff;
    font-weight: 800;
    font-size: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: 0.04em;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.28);
    box-shadow:
        inset 0 1px 8px rgba(255, 255, 255, 0.28),
        0 14px 28px rgba(0, 0, 0, 0.26);
    z-index: 1;
}

.ball::before {
    content: "";
    position: absolute;
    inset: 7px 11px auto;
    height: 14px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    filter: blur(2px);
}

.red { background: radial-gradient(circle at 30% 30%, #ff9fa8, #ff5c73 48%, #b41036 100%); }
.blue { background: radial-gradient(circle at 30% 30%, #8ed4ff, #3e98ff 52%, #0d4fc4 100%); }
.orange { background: radial-gradient(circle at 30% 30%, #ffe29d, #ffaf47 48%, #d86b05 100%); }
.purple { background: radial-gradient(circle at 30% 30%, #d4bcff, #9e72ff 50%, #5a27c9 100%); }

.separator {
    width: 10px;
    height: 10px;
    align-self: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.18);
    box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.04);
}

.flash {
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(255, 255, 255, 0.65), rgba(255, 255, 255, 0.04));
    opacity: 0;
    z-index: 10;
    pointer-events: none;
}

.loader {
    width: 38px;
    height: 38px;
    border: 4px solid rgba(255, 255, 255, 0.14);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
    margin: 18px auto 0;
    display: none;
}

.footer {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
    padding: 20px 24px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-muted);
    font-size: 14px;
}

.footer p {
    margin: 0;
    line-height: 1.8;
}

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

@media (max-width: 860px) {
    .page-shell {
        width: min(100% - 20px, 1120px);
        padding-top: 20px;
    }

    .hero,
    .section {
        padding: 22px;
        border-radius: 24px;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .section-head {
        flex-direction: column;
    }

    button {
        width: 100%;
    }
}

@media (max-width: 520px) {
    .hero h1 {
        font-size: 34px;
    }

    h2 {
        font-size: 25px;
    }

    .ball {
        width: 56px;
        height: 56px;
        font-size: 20px;
    }
}