:root {
    --bg: #f0f2f5;
    --text: #1f2937;
    --muted: #4b5563;
    --container-bg: #ffffff;
    --primary: #007bff;
    --primary-soft: #e7f1ff;
    --secondary: #6c757d;
    --submit: #28a745;
    --submit-hover: #218838;
    --question-bg: #f8f9fa;
    --result-bg: #e9ecef;
    --border: #d9dee5;
    --shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

body[data-theme='dark'] {
    --bg: #111827;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --container-bg: #1f2937;
    --primary: #60a5fa;
    --primary-soft: #1e3a5f;
    --secondary: #9ca3af;
    --submit: #22c55e;
    --submit-hover: #16a34a;
    --question-bg: #111827;
    --result-bg: #0f172a;
    --border: #374151;
    --shadow: 0 8px 16px rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Helvetica Neue', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.site-header {
    background: var(--container-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 30;
}

.header-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.brand {
    font-weight: 800;
    font-size: 20px;
    color: var(--text);
}

.site-nav {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.site-nav a {
    color: var(--muted);
    font-weight: 600;
}

.page {
    max-width: 1080px;
    margin: 0 auto;
    padding: 22px 16px 40px;
}

.hero {
    background: linear-gradient(130deg, var(--primary-soft), var(--container-bg));
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 26px;
    margin-bottom: 22px;
}

.hero h1 {
    margin: 0 0 8px;
    color: var(--text);
}

.hero p {
    margin: 0;
    color: var(--muted);
}

.hero-meta {
    margin-top: 14px;
    font-size: 14px;
    color: var(--muted);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 22px;
}

.info-card {
    background: var(--container-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
}

.info-card h3 {
    margin: 0 0 6px;
    font-size: 17px;
}

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

.section {
    background: var(--container-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 16px;
}

.section h2 {
    margin-top: 0;
    margin-bottom: 10px;
}

.section h3 {
    margin-bottom: 8px;
}

.section p,
.section li {
    color: var(--muted);
}

.list-tight {
    margin: 0;
    padding-left: 20px;
}

.container {
    position: relative;
    max-width: 900px;
    margin: 20px auto 0;
    background: var(--container-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    text-align: center;
}

h1 {
    color: var(--primary);
}

.hidden {
    display: none;
}

.top-controls {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 8px;
}

#theme-toggle-btn {
    border: 1px solid var(--border);
    background: var(--question-bg);
    color: var(--text);
    border-radius: 6px;
    padding: 8px 12px;
    cursor: pointer;
}

#mode-selection {
    margin-top: 20px;
}

.mode-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.mode-btn {
    border: 2px solid var(--primary);
    background: transparent;
    color: var(--primary);
    padding: 10px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
}

.mode-btn.selected {
    background: var(--primary);
    color: #ffffff;
}

#test-selection {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.test-type-btn {
    background-color: var(--container-bg);
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 20px 30px;
    font-size: 18px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.test-type-btn:hover {
    background-color: var(--primary);
    color: #ffffff;
    transform: translateY(-3px);
}

#home-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    background: var(--secondary);
    color: #ffffff;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
}

#questions-container {
    text-align: left;
    margin-top: 20px;
}

.question {
    margin-bottom: 20px;
    padding: 15px;
    border-left: 5px solid var(--primary);
    background-color: var(--question-bg);
    border-radius: 5px;
}

.options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.option {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.25s, color 0.25s, border-color 0.25s;
    text-align: center;
}

.option.selected {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

#submit-btn {
    background-color: var(--submit);
    color: #ffffff;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 20px;
}

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

#result-container {
    margin-top: 30px;
    padding: 30px;
    background: var(--result-bg);
    border-radius: 8px;
    text-align: center;
    animation: fadeIn 0.6s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

#mbti-type {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 15px;
}

#mbti-description {
    font-size: 18px;
    margin-top: 10px;
    line-height: 1.6;
}

.question-progress {
    margin: 0 0 10px;
    font-weight: 700;
    color: var(--primary);
}

.site-footer {
    max-width: 1080px;
    margin: 0 auto;
    padding: 22px 16px 30px;
    color: var(--muted);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 6px;
}

.legal-page {
    max-width: 880px;
    margin: 0 auto;
}

@media (max-width: 860px) {
    .info-grid {
        grid-template-columns: 1fr;
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 640px) {
    .page {
        padding-top: 16px;
    }

    .hero {
        padding: 18px;
    }

    .container {
        margin-top: 16px;
        padding: 14px;
    }

    #home-btn {
        position: static;
        margin-bottom: 10px;
    }

    .test-type-btn {
        width: 100%;
        font-size: 16px;
        padding: 14px;
    }
}