body {
    --bg-color: #f4f6f8;
    --text-color: #172033;
    --muted-color: #5b6472;
    --surface-color: #ffffff;
    --button-bg: #2563eb;
    --button-bg-hover: #1d4ed8;
    --button-text: #ffffff;
    --toggle-bg: #e5e7eb;
    --toggle-text: #111827;
    --border-color: #d7dde6;
    --input-bg: #ffffff;
    --accent-bg: #eef5ff;

    font-family: Arial, sans-serif;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.2s ease, color 0.2s ease;
}

body.dark-mode {
    --bg-color: #111827;
    --text-color: #f9fafb;
    --muted-color: #c4cad4;
    --surface-color: #1f2937;
    --button-bg: #38bdf8;
    --button-bg-hover: #0ea5e9;
    --button-text: #0f172a;
    --toggle-bg: #374151;
    --toggle-text: #f9fafb;
    --border-color: #4b5563;
    --input-bg: #111827;
    --accent-bg: #172033;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px max(20px, calc((100vw - 980px) / 2));
    border-bottom: 1px solid var(--border-color);
    background-color: var(--surface-color);
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
}

.site-nav a,
.comments-section a {
    color: var(--button-bg);
    text-decoration: none;
    font-weight: 700;
}

.site-nav a:hover,
.comments-section a:hover {
    text-decoration: underline;
}

.theme-toggle {
    flex: 0 0 auto;
    padding: 8px 14px;
    border: 0;
    border-radius: 999px;
    background-color: var(--toggle-bg);
    color: var(--toggle-text);
    font-size: 0.95em;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover,
#generate-btn:hover,
.submit-btn:hover,
.tab-button:hover {
    transform: translateY(-1px);
}

.page-shell {
    width: min(94vw, 980px);
    margin: 32px auto;
}

.hero,
.content-section,
.comments-section {
    border-radius: 8px;
    background-color: var(--surface-color);
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
}

body.dark-mode .hero,
body.dark-mode .content-section,
body.dark-mode .comments-section {
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
    gap: 28px;
    align-items: center;
    padding: 36px;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--button-bg);
    font-weight: 700;
}

h1,
h2,
h3,
p {
    overflow-wrap: anywhere;
}

h1 {
    margin: 0 0 14px;
    font-size: 2.4rem;
    line-height: 1.15;
}

h2 {
    margin: 0 0 16px;
    font-size: 1.45rem;
}

h3 {
    margin: 0 0 8px;
    font-size: 1.05rem;
}

p {
    color: var(--muted-color);
    line-height: 1.65;
}

.tool-panel {
    padding: 24px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--accent-bg);
    text-align: center;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    min-height: 56px;
    margin: 0 0 20px;
}

.number {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.15em;
    font-weight: 700;
    color: white;
}

#generate-btn,
.submit-btn {
    border: 0;
    border-radius: 6px;
    padding: 11px 20px;
    background-color: var(--button-bg);
    color: var(--button-text);
    font-size: 1em;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

#generate-btn:hover,
.submit-btn:hover {
    background-color: var(--button-bg-hover);
}

.tool-note {
    margin: 14px 0 0;
    font-size: 0.92rem;
}

.content-section,
.comments-section {
    margin-top: 22px;
    padding: 30px;
}

.section-heading {
    max-width: 760px;
    margin-bottom: 22px;
}

.content-tabs {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 20px;
}

.tab-button {
    min-height: 44px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--accent-bg);
    color: var(--text-color);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.tab-button.is-active {
    border-color: var(--button-bg);
    background-color: var(--button-bg);
    color: var(--button-text);
}

.test-panel {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(300px, 1.15fr);
    gap: 22px;
    align-items: start;
    padding: 22px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--accent-bg);
}

.test-panel[hidden] {
    display: none;
}

.test-copy p {
    margin-bottom: 0;
}

.mini-form {
    display: grid;
    gap: 12px;
}

.mini-form label,
.quiz-form legend {
    font-size: 0.92rem;
    font-weight: 700;
}

.quiz-form fieldset {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--surface-color);
}

.quiz-form label {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-weight: 400;
    line-height: 1.45;
}

.quiz-form input[type="radio"] {
    width: auto;
    margin-top: 3px;
}

.result-box {
    grid-column: 1 / -1;
    min-height: 54px;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--surface-color);
}

.result-box:empty {
    display: none;
}

.result-box strong {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-size: 1.08rem;
}

.result-box p {
    margin: 6px 0 0;
}

.result-note {
    font-size: 0.9rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.feature-grid article {
    min-height: 130px;
    padding: 18px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--accent-bg);
}

details {
    border-top: 1px solid var(--border-color);
    padding: 14px 0;
}

details:last-child {
    border-bottom: 1px solid var(--border-color);
}

summary {
    cursor: pointer;
    font-weight: 700;
}

.contact-form {
    display: grid;
    gap: 10px;
    text-align: left;
}

.contact-form h2,
.comments-section h2 {
    text-align: center;
}

.contact-form label {
    font-size: 0.9em;
    font-weight: 700;
}

.contact-form input,
.contact-form textarea,
.mini-form input,
.mini-form select {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px 12px;
    background-color: var(--input-bg);
    color: var(--text-color);
    font: inherit;
}

.contact-form textarea {
    resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus,
.mini-form input:focus,
.mini-form select:focus {
    outline: 2px solid var(--button-bg);
    outline-offset: 2px;
}

#disqus_thread {
    min-height: 220px;
}

.comment-guideline,
.comments-section noscript {
    text-align: center;
}

.comments-section noscript {
    display: block;
    line-height: 1.5;
}

.site-footer {
    width: min(94vw, 980px);
    margin: 0 auto 34px;
    text-align: center;
}

@media (max-width: 760px) {
    .site-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .hero {
        grid-template-columns: 1fr;
        padding: 26px;
    }

    h1 {
        font-size: 2rem;
    }

    .feature-grid,
    .content-tabs,
    .test-panel {
        grid-template-columns: 1fr;
    }

    .content-section,
    .comments-section {
        padding: 24px;
    }
}