/* ========================================
   계산기 공통 레이아웃 & SEO UI 표준
   모든 계산기 페이지에서 사용
======================================== */

:root {
    --section-gap: 28px;
    --card-radius: 16px;
    --card-padding: 18px 20px;
    --card-shadow: 0 6px 20px rgba(0,0,0,0.06);
    --card-border: 1px solid rgba(0,0,0,0.08);
}

/* ========================================
   [1] 공통 컨테이너: 결과/SEO 폭 통일
======================================== */

.calc-container {
    width: 100%;
    max-width: 920px;
    margin: 0 auto;
    padding: 0 16px;
    box-sizing: border-box;
}

/* ========================================
   [2] 섹션 간 여백 표준화
======================================== */

.calc-result {
    margin-top: var(--section-gap);
}

.calc-seo {
    margin-top: var(--section-gap);
    width: 100%;
    max-width: 100%;
    margin-left: 0;
    margin-right: 0;
    padding-left: 0;
    padding-right: 0;
}

/* ========================================
   [3] SEO 섹션 공통 스타일
======================================== */

.calc-seo {
    font-size: 16px;
    line-height: 1.8;
    color: #1f2937;
}

.calc-seo h2 {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 10px 0;
    color: #111827;
}

.calc-seo h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 10px 0;
    color: #1f2937;
}

.calc-seo h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 8px 0;
    color: #374151;
}

.calc-seo p {
    margin: 10px 0;
    line-height: 1.8;
}

/* ========================================
   [4] 카드 스타일 (SEO 블록 기본)
======================================== */

.seo-card {
    background: #fff;
    border: var(--card-border);
    border-radius: var(--card-radius);
    padding: var(--card-padding);
    box-shadow: var(--card-shadow);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.seo-card:hover {
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.seo-card + .seo-card {
    margin-top: 16px;
}

/* 헤더 카드 (특별 스타일) */
.seo-header-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    text-align: center;
    padding: 32px 24px;
    margin-bottom: 20px;
}

.seo-header-card h2 {
    color: white;
    margin-bottom: 8px;
}

.seo-subtitle {
    margin: 0;
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 400;
    color: white;
}

/* 경고 카드 */
.seo-warning-card {
    background: #fff9f0;
    border-left: 4px solid #f39c12;
}

/* ========================================
   [5] 계산식 박스
======================================== */

.seo-formula {
    display: inline-block;
    padding: 8px 10px;
    border-radius: 12px;
    background: rgba(0,0,0,0.04);
    border: 1px solid rgba(0,0,0,0.06);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 14px;
    color: #667eea;
    font-weight: 600;
    word-break: break-word;
}

/* ========================================
   [6] 리스트 스타일
======================================== */

.seo-simple-list {
    list-style: none;
    padding-left: 0;
    margin: 12px 0;
}

.seo-simple-list li {
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
    font-size: 0.95rem;
    color: #555;
    line-height: 1.6;
}

.seo-simple-list li:before {
    content: "▪";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

/* 체크리스트 */
.seo-checklist {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 14px;
    list-style: none;
    padding-left: 0;
    margin: 14px 0;
}

.seo-checklist li {
    padding-left: 24px;
    position: relative;
    font-size: 0.9rem;
    color: #555;
    line-height: 1.7;
}

.seo-checklist li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #27ae60;
    font-weight: bold;
    font-size: 1rem;
}

@media (max-width: 640px) {
    .seo-checklist {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   [7] 아코디언 스타일 (details/summary)
======================================== */

.seo-accordion {
    margin: 12px 0;
}

.seo-accordion details {
    border: var(--card-border);
    border-radius: 12px;
    padding: 10px 12px;
    background: #fff;
    cursor: pointer;
}

.seo-accordion details + details {
    margin-top: 10px;
}

.seo-accordion summary {
    font-weight: 600;
    list-style: none;
    padding: 6px 0;
    user-select: none;
    transition: color 0.3s ease;
}

.seo-accordion summary::-webkit-details-marker {
    display: none;
}

.seo-accordion summary::before {
    content: "▶ ";
    display: inline-block;
    margin-right: 8px;
    transition: transform 0.3s ease;
    color: #667eea;
    font-weight: bold;
    font-size: 0.9rem;
}

.seo-accordion details[open] summary::before {
    transform: rotate(90deg);
}

.seo-accordion details[open] summary {
    color: #667eea;
}

.seo-accordion .seo-accordion-content {
    padding: 12px 0 10px 20px;
    margin-top: 8px;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.seo-accordion .seo-accordion-content p {
    margin: 8px 0;
    font-size: 0.9rem;
    color: #555;
}

/* ========================================
   [8] 하이라이트 & 팁 박스
======================================== */

.seo-highlight {
    background: #f0f4ff;
    border-left: 3px solid #667eea;
    padding: 12px 14px;
    margin: 16px 0;
    border-radius: 6px;
    font-size: 0.9rem;
}

.seo-tip {
    background: #f5f5f5;
    border-left: 3px solid #8b5cf6;
    padding: 12px 14px;
    margin: 16px 0;
    border-radius: 6px;
    font-size: 0.9rem;
}

/* ========================================
   [9] 테이블 스타일
======================================== */

.seo-card table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
}

.seo-card table th,
.seo-card table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.seo-card table th {
    background: #f9f9f9;
    font-weight: 600;
    color: #374151;
}

.seo-card table tr:hover {
    background: #f9f9f9;
}

/* ========================================
   [10] 반응형 (모바일)
======================================== */

@media (max-width: 768px) {
    .seo-card {
        padding: 16px 18px;
        border-radius: 14px;
    }

    .seo-header-card {
        padding: 24px 18px;
        margin-bottom: 16px;
    }

    .seo-header-card h2 {
        font-size: 1.6rem;
    }

    .seo-subtitle {
        font-size: 1rem;
    }

    .calc-seo h2 {
        font-size: 1.4rem;
    }

    .calc-seo h3 {
        font-size: 1.1rem;
    }

    .calc-seo p {
        font-size: 0.95rem;
        line-height: 1.7;
    }

    .seo-checklist {
        gap: 8px 12px;
    }

    .seo-card table th,
    .seo-card table td {
        padding: 8px 10px;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .seo-card {
        padding: 14px 16px;
    }

    .seo-header-card {
        padding: 20px 16px;
    }

    .seo-header-card h2 {
        font-size: 1.4rem;
    }

    .calc-seo h3 {
        font-size: 1rem;
    }

    .calc-seo p {
        font-size: 0.9rem;
    }

    .seo-checklist {
        grid-template-columns: 1fr;
        gap: 8px 0;
    }
}