:root {
    --bg-color: #f5f7fa;
    --surface-color: #ffffff;
    --text-color: #2d3748;
    --text-muted: #718096;
    --header-bg: #ffffff;
    --border-color: #e2e8f0;
    --btn-bg: #4f46e5;
    --btn-hover: #4338ca;
    --accent: #10b981;
    --pb-color: #dc2626;
}

body.dark {
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --header-bg: #1e293b;
    --border-color: #334155;
    --btn-bg: #6366f1;
    --btn-hover: #4f46e5;
    --accent: #10b981;
    --pb-color: #ef4444;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    transition: background-color 0.3s;
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--btn-bg);
}

nav { display: flex; gap: 1.5rem; flex: 1; }

nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

nav a:hover { color: var(--btn-bg); }

#theme-toggle {
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
    background-color: var(--btn-bg);
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color 0.3s;
    white-space: nowrap;
}

#theme-toggle:hover { background-color: var(--btn-hover); }

/* Main */
main {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem;
}

/* Hero */
.hero {
    text-align: center;
    padding: 3rem 1rem 2rem;
}

.hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.hero-desc { color: var(--text-muted); font-size: 1.05rem; }

/* Card */
.card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: background-color 0.3s, border-color 0.3s;
}

.card h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--btn-bg);
    display: inline-block;
}

.card h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; }
.card p { color: var(--text-muted); margin-bottom: 0.5rem; }

/* Generator */
#generator { text-align: center; }

#generator-btn {
    padding: 0.9rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    background-color: var(--btn-bg);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(79,70,229,0.35);
    transition: background-color 0.3s, transform 0.1s, box-shadow 0.3s;
    margin-top: 1rem;
}

#generator-btn:hover {
    background-color: var(--btn-hover);
    box-shadow: 0 6px 20px rgba(79,70,229,0.45);
}

#generator-btn:active { transform: scale(0.97); }

/* Sets */
#sets-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.75rem;
    text-align: left;
}

.set-row {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    background-color: var(--bg-color);
    border-radius: 12px;
    padding: 0.85rem 1.25rem;
    transition: background-color 0.3s;
}

.set-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 42px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.balls-group {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.ball {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 800;
    color: #fff;
    box-shadow: 0 3px 8px rgba(0,0,0,0.2);
    animation: pop 0.35s ease both;
}

.powerball {
    background: var(--pb-color) !important;
    box-shadow: 0 3px 10px rgba(220,38,38,0.4);
}

@keyframes pop {
    0% { transform: scale(0); opacity: 0; }
    75% { transform: scale(1.15); }
    100% { transform: scale(1); opacity: 1; }
}

.pb-divider {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-muted);
    padding: 0 0.2rem;
}

.tip-text {
    margin-top: 1.25rem;
    font-size: 0.9rem;
    color: var(--accent);
    text-align: center;
}

/* Steps */
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.step {
    background-color: var(--bg-color);
    border-radius: 10px;
    padding: 1.25rem;
    text-align: center;
    transition: background-color 0.3s;
}

.step-num {
    display: inline-flex;
    width: 36px;
    height: 36px;
    background-color: var(--btn-bg);
    color: white;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.step h3 { font-size: 1rem; margin: 0.5rem 0 0.4rem; }
.step p { font-size: 0.88rem; color: var(--text-muted); }

/* Stats */
.section-desc { color: var(--text-muted); margin-bottom: 1.5rem; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-item {
    background-color: var(--bg-color);
    border-radius: 10px;
    padding: 1.25rem;
    text-align: center;
    transition: background-color 0.3s;
}

.stat-number {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--btn-bg);
    margin-bottom: 0.4rem;
}

.stat-label { font-size: 0.85rem; color: var(--text-muted); }

.strategy-list { padding-left: 1.2rem; color: var(--text-muted); }
.strategy-list li { margin-bottom: 0.6rem; }
.strategy-list strong { color: var(--text-color); }

.notice {
    background-color: #fef3c7;
    color: #92400e;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1.5rem;
    font-size: 0.9rem;
}

body.dark .notice { background-color: #451a03; color: #fcd34d; }

/* Prize Table */
.prize-table-wrapper { overflow-x: auto; margin-top: 1rem; }

.prize-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.prize-table th, .prize-table td {
    padding: 0.65rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.prize-table th {
    background-color: var(--btn-bg);
    color: white;
    font-weight: 600;
}

.prize-table tr:hover td { background-color: var(--bg-color); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 1rem; }

.faq-item {
    background-color: var(--bg-color);
    border-radius: 10px;
    padding: 1.25rem;
    transition: background-color 0.3s;
}

.faq-item h3 { font-size: 1rem; margin: 0 0 0.5rem; color: var(--text-color); }
.faq-item p { font-size: 0.92rem; color: var(--text-muted); margin: 0; }

code {
    background-color: var(--border-color);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-size: 0.85rem;
}

/* Ads */
.ad-container { max-width: 960px; margin: 1.5rem auto; }

/* Contact */
#contact-section p { margin-bottom: 1.25rem; }
.form-group { margin-bottom: 1rem; }

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 0.95rem;
    transition: border-color 0.2s, background-color 0.3s;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--btn-bg);
}

.form-group textarea { height: 120px; resize: vertical; }

#submit-btn {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
    width: 100%;
}

#submit-btn:hover { background-color: #059669; }

/* Disqus */
#disqus-section { margin-bottom: 2rem; }

#disqus-section h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--btn-bg);
    display: inline-block;
}

/* Footer */
footer {
    background-color: var(--header-bg);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    margin-top: 2rem;
    transition: background-color 0.3s;
}

.footer-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-links { display: flex; gap: 1.5rem; }

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover { color: var(--btn-bg); }

@media (max-width: 600px) {
    .hero h1 { font-size: 1.6rem; }
    .header-inner { gap: 0.75rem; }
    nav { gap: 0.75rem; font-size: 0.82rem; }
    .ball { width: 42px; height: 42px; font-size: 1rem; }
}