/* --- 기본 스타일 및 변수 정의 --- */
:root {
    --text-color: #212529;
    --background-color: #FFFFFF;
    --section-bg-light: #F8F9FA;
    --border-color: #DEE2E6;
    --card-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
    --link-color: #0056b3;
    --highlight-bg: #F1F3F5;
    --quote-border: #0056b3;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
    font-size: 17px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4 {
    font-weight: 600;
    margin-top: 0;
    line-height: 1.3;
}

h1 { font-size: 2.2rem; }
h2 { font-size: 1.8rem; margin-bottom: 20px; }
h3 { font-size: 1.3rem; margin-top: 40px; margin-bottom: 15px;}
h4 { font-size: 1.1rem; }

section {
    padding: 60px 0;
}

.bg-light {
    background-color: var(--section-bg-light);
}

/* --- Hero Section --- */
.hero-section {
    background-color: var(--background-color);
    text-align: center;
    padding: 80px 0 40px;
}

.hero-section h1 {
    margin-bottom: 15px;
}

.hero-section p {
    font-size: 1.15rem;
    color: #495057;
    max-width: 650px;
    margin: 0 auto 25px;
}

.hero-section .reassurance {
    display: inline-block;
    background-color: #F8F9FA;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: #6C757D;
    margin-top: 20px;
    border: 1px solid #E9ECEF;
}

/* --- 광고 영역 --- */
.ad-section {
    padding: 30px 0;
}

.ad-space {
    border: 1px dashed var(--border-color);
    background-color: var(--section-bg-light);
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6C757D;
    font-size: 0.9rem;
    border-radius: 8px;
}


/* --- 콘텐츠 섹션 공통 --- */
.content-section .container {
    max-width: 720px;
}

.content-section h2 {
    text-align: left;
    margin-bottom: 25px;
}

.content-section p {
    margin-bottom: 1.2rem; /* 문단 간격 추가 */
}

/* --- Problem Awareness 섹션 스타일 --- */
.reason-list {
    list-style: none;
    padding-left: 0;
    margin-top: 30px;
    margin-bottom: 30px;
}

.reason-list li {
    padding-left: 25px;
    position: relative;
    margin-bottom: 12px;
}

.reason-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--link-color);
    font-weight: bold;
}

.highlight-quote {
    margin: 40px 0;
    padding: 25px;
    background-color: var(--highlight-bg);
    border-left: 5px solid var(--quote-border);
    border-radius: 4px;
}

.highlight-quote p {
    font-size: 1.1rem;
    font-weight: 500;
    color: #343A40;
    margin: 0;
}

/* --- 가치 제안 목록 (What It Is) --- */
.value-prop-list {
    list-style: none;
    padding: 0;
    margin-top: 20px;
}

.value-prop-list li {
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
    position: relative;
    padding-left: 50px;
    box-shadow: var(--card-shadow);
}

.value-prop-list li::before {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    font-weight: bold;
}

.value-prop-list li:nth-child(1)::before { content: '💬'; }
.value-prop-list li:nth-child(2)::before { content: '🏗️'; }
.value-prop-list li:nth-child(3)::before { content: '❓'; }

.value-prop-list li strong {
    display: block;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 3px;
}


/* --- Agenda 섹션 --- */
.agenda-grid {
    display: grid;
    grid-template-columns: 1fr; /* 모바일에서는 1열 */
    gap: 25px;
    margin-top: 40px;
}

.agenda-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    display: flex;
    flex-direction: column;
}

.agenda-number {
    font-size: 1rem;
    font-weight: bold;
    color: var(--link-color);
    margin-bottom: 10px;
}

.agenda-item h3 {
    font-size: 1.2rem;
    margin: 0 0 10px 0;
}

.agenda-item p {
    font-size: 1rem;
    color: #495057;
    margin: 0;
    line-height: 1.6;
}


/* --- 카드 그리드 (Misconceptions) --- */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 25px;
}

.card {
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    box-shadow: none;
    transition: border-color 0.2s ease;
}

.card:hover {
    border-color: #999;
}

.card h3 {
    margin-bottom: 10px;
}

/* --- FAQ --- */
.faq-section {
    padding-top: 60px;
    padding-bottom: 60px;
}

.faq-section .container {
    max-width: 720px;
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 40px;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 18px 0;
}

.faq-item:first-of-type {
    border-top: 1px solid var(--border-color);
}

.faq-question {
    cursor: pointer;
    margin: 0;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: #6C757D;
    transition: transform 0.2s ease;
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

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

.faq-answer p {
    margin: 15px 0 0 0;
    color: #495057;
    font-size: 1rem;
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 40px 0;
    font-size: 0.9rem;
    color: #6C757D;
    background-color: var(--section-bg-light);
    border-top: 1px solid var(--border-color);
}

/* --- Guide Page Styles --- */
.guide-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--background-color);
}

.guide-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.guide-header .logo a {
    text-decoration: none;
    font-weight: bold;
    color: var(--text-color);
    font-size: 1.2rem;
}

.guide-container {
    max-width: 720px;
    margin: 40px auto;
    padding: 0 20px;
}

.guide-article h1 {
    font-size: 2.4rem;
    margin-bottom: 25px;
}

.guide-article .ad-space {
    margin: 30px 0;
}

.guide-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.guide-content h3 {
    font-size: 1.5rem;
    margin-top: 50px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

/* --- 반응형 (태블릿 이상) --- */
@media (min-width: 768px) {
    .agenda-grid {
        grid-template-columns: repeat(2, 1fr); /* 2열 */
    }
}

/* --- 반응형 (모바일) --- */
@media (max-width: 768px) {
    body { font-size: 16px; }
    h1 { font-size: 1.9rem; }
    h2 { font-size: 1.6rem; }

    section {
        padding: 50px 0;
    }

    .guide-article h1 {
        font-size: 2.1rem;
    }
}