:root[data-theme="light"] {
    --bg: #f5f5f5;
    --surface: #ffffff;
    --text: #1a1a1a;
    --text-secondary: #555;
    --primary: #4a6cf7;
    --primary-hover: #3a5ce5;
    --shadow: rgba(0, 0, 0, 0.1);
    --ball-shadow: rgba(0, 0, 0, 0.15);
    --toggle-bg: #e0e0e0;
    --border: #e0e0e0;
    --header-bg: rgba(255, 255, 255, 0.95);
}

:root[data-theme="dark"] {
    --bg: #1a1a2e;
    --surface: #16213e;
    --text: #eaeaea;
    --text-secondary: #aaa;
    --primary: #4a6cf7;
    --primary-hover: #6b8cff;
    --shadow: rgba(0, 0, 0, 0.3);
    --ball-shadow: rgba(0, 0, 0, 0.4);
    --toggle-bg: #2a2a4a;
    --border: #2a2a4a;
    --header-bg: rgba(22, 33, 62, 0.95);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.7;
    transition: background-color 0.3s, color 0.3s;
}

/* Header & Navigation */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    transition: background 0.3s, border-color 0.3s;
}

.header-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.site-logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    flex-shrink: 0;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 8px;
    transition: color 0.2s, background 0.2s;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: rgba(74, 108, 247, 0.1);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

#theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--toggle-bg);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s, transform 0.2s;
    box-shadow: 0 2px 8px var(--shadow);
    flex-shrink: 0;
}

#theme-toggle:hover {
    transform: scale(1.1);
}

/* Main Content */
main {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 20px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
}

.container {
    width: 100%;
    text-align: center;
    background: var(--surface);
    padding: 40px 32px;
    border-radius: 16px;
    box-shadow: 0 4px 24px var(--shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 12px;
    color: var(--text);
}

h2 {
    font-size: 1.4rem;
    margin-bottom: 16px;
    color: var(--text);
}

.section-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

/* Generator Section */
.generator-section {
    padding: 48px 32px;
}

.set-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 28px;
}

.set-selector label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.set-buttons {
    display: flex;
    gap: 6px;
}

.set-btn {
    width: 40px;
    height: 36px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s, color 0.2s;
    font-family: inherit;
}

.set-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.set-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

#lotto-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-height: 64px;
    margin-bottom: 32px;
    align-items: center;
}

.lotto-row {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    justify-content: center;
}

.row-label {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    background: var(--bg);
    border-radius: 6px;
    flex-shrink: 0;
}

.lotto-balls {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.ball {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 4px 12px var(--ball-shadow);
    animation: popIn 0.3s ease-out;
}

.ball.yellow { background: linear-gradient(135deg, #fbc531, #e1b12c); }
.ball.blue { background: linear-gradient(135deg, #0097e6, #0984e3); }
.ball.red { background: linear-gradient(135deg, #e84118, #c23616); }
.ball.gray { background: linear-gradient(135deg, #7f8fa6, #718093); }
.ball.green { background: linear-gradient(135deg, #44bd32, #4cd137); }

.ball-sm {
    display: inline-flex;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    margin-right: 8px;
    vertical-align: middle;
    flex-shrink: 0;
}

.ball-sm.yellow { background: linear-gradient(135deg, #fbc531, #e1b12c); }
.ball-sm.blue { background: linear-gradient(135deg, #0097e6, #0984e3); }
.ball-sm.red { background: linear-gradient(135deg, #e84118, #c23616); }
.ball-sm.gray { background: linear-gradient(135deg, #7f8fa6, #718093); }
.ball-sm.green { background: linear-gradient(135deg, #44bd32, #4cd137); }

.bonus-separator {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}

@keyframes popIn {
    0% { transform: scale(0); opacity: 0; }
    70% { transform: scale(1.15); }
    100% { transform: scale(1); opacity: 1; }
}

#generate-btn {
    padding: 14px 36px;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

#generate-btn:hover {
    background: var(--primary-hover);
}

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

/* Content Sections */
.content-section {
    text-align: left;
}

.content-section h2 {
    text-align: center;
    margin-bottom: 20px;
}

.content-section p {
    margin-bottom: 16px;
    color: var(--text);
    font-size: 0.95rem;
    line-height: 1.8;
}

.content-section p:last-child {
    margin-bottom: 0;
}

/* Color Guide */
.color-guide {
    background: var(--bg);
    padding: 20px 24px;
    border-radius: 12px;
    margin-top: 20px;
}

.color-guide h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text);
}

.color-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.color-list li {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Info Table */
.table-wrap {
    overflow-x: auto;
    margin: 20px 0;
}

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

.info-table th,
.info-table td {
    padding: 12px 16px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.info-table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-table td {
    color: var(--text);
}

.info-table tbody tr:hover {
    background: var(--bg);
}

/* Tips */
.tips-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 20px;
}

.tip-item {
    background: var(--bg);
    padding: 20px 24px;
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

.tip-item h3 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text);
}

.tip-item p {
    margin-bottom: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* FAQ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.2s;
}

.faq-item.open {
    border-color: var(--primary);
}

.faq-question {
    width: 100%;
    padding: 16px 20px;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    text-align: left;
    gap: 12px;
    font-family: inherit;
}

.faq-question:hover {
    color: var(--primary);
}

.faq-icon {
    font-size: 1.3rem;
    font-weight: 300;
    transition: transform 0.3s;
    flex-shrink: 0;
    color: var(--text-secondary);
}

.faq-item.open .faq-icon {
    transform: rotate(45deg);
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding: 0 20px 16px;
}

.faq-answer p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

/* Contact Form */
.contact-section {
    width: 100%;
}

.contact-section h2 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.form-group {
    text-align: left;
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    font-size: 0.95rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    background: var(--bg);
    color: var(--text);
    outline: none;
    transition: border-color 0.2s, background 0.3s, color 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
}

.form-group textarea {
    resize: vertical;
}

.submit-btn {
    width: 100%;
    padding: 14px;
    font-size: 1.05rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    margin-top: 8px;
}

.submit-btn:hover {
    background: var(--primary-hover);
}

.submit-btn:active {
    transform: scale(0.97);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.form-status {
    margin-top: 16px;
    font-size: 0.95rem;
    font-weight: 500;
    min-height: 24px;
}

.form-status.success {
    color: #44bd32;
}

.form-status.error {
    color: #e84118;
}

/* Ad Container */
.ad-container {
    width: 100%;
    max-width: 800px;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 12px;
}

.ad-container ins {
    width: 100%;
}

/* Comments */
.comments-section {
    width: 100%;
}

.comments-section h2 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.comments-section .utterances {
    max-width: 100%;
}

/* Footer */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 32px 20px;
    margin-top: 32px;
    transition: background 0.3s, border-color 0.3s;
}

.footer-inner {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.footer-copy {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.footer-disclaimer {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Sub Pages (Privacy, Terms, About) */
.page-content {
    width: 100%;
    text-align: left;
}

.page-content h1 {
    text-align: center;
    margin-bottom: 32px;
}

.page-content h2 {
    font-size: 1.2rem;
    margin-top: 32px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border);
}

.page-content h3 {
    font-size: 1.05rem;
    margin-top: 20px;
    margin-bottom: 8px;
}

.page-content p {
    margin-bottom: 12px;
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text);
}

.page-content ul {
    margin: 12px 0;
    padding-left: 24px;
}

.page-content ul li {
    margin-bottom: 8px;
    font-size: 0.93rem;
    line-height: 1.7;
    color: var(--text);
}

.page-last-updated {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* Responsive */
@media (max-width: 640px) {
    .menu-toggle {
        display: flex;
    }

    .site-nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--header-bg);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 12px 20px;
        border-bottom: 1px solid var(--border);
        gap: 4px;
    }

    .site-nav.open {
        display: flex;
    }

    .nav-link {
        padding: 10px 12px;
        font-size: 0.95rem;
    }

    .container {
        padding: 28px 20px;
    }

    .generator-section {
        padding: 36px 20px;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .ball {
        width: 42px;
        height: 42px;
        font-size: 0.95rem;
    }

    .lotto-balls {
        gap: 6px;
    }

    .row-label {
        width: 24px;
        height: 24px;
        font-size: 0.7rem;
    }

    .color-list {
        flex-direction: column;
        gap: 8px;
    }

    .info-table th,
    .info-table td {
        padding: 10px 12px;
        font-size: 0.85rem;
    }
}