:root {
    --bg-color: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #f3f4f6;
    --accent-color: #2563eb;
    --hover-bg: #f9fafb;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    word-break: keep-all;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Simple Navigation Header */
.nav-simple {
    padding: 16px 0;
    display: flex;
    justify-content: flex-start;
}

.logo {
    font-size: 20px;
    font-weight: 800;
    color: var(--text-main);
    text-decoration: none;
    letter-spacing: -0.02em;
}

/* Main Header Section */
.main-header {
    text-align: center;
    padding: 30px 0 40px;
}

.label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 8px;
}

.ip-container {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.ip-container:hover {
    background-color: var(--hover-bg);
    transform: translateY(-2px);
}

.ip-container:active {
    transform: translateY(0);
}

.ip-address {
    font-size: clamp(2rem, 8vw, 4rem);
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.04em;
    line-height: 1;
}

.copy-hint {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 8px;
    opacity: 0;
    transition: opacity 0.2s;
}

.ip-container:hover .copy-hint {
    opacity: 1;
}

.copy-hint.copied {
    color: #059669;
    font-weight: 600;
    opacity: 1 !important;
}

/* Detailed Information Section */
.info-section {
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
}

.section-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-main);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 12px;
    margin-bottom: 40px;
}

.info-item {
    background: #fcfcfd;
    padding: 16px 20px;
    border-radius: 12px;
    border: 1px solid #f3f4f6;
    transition: border-color 0.2s;
}

.info-item:hover {
    border-color: #e5e7eb;
}

.info-label {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 4px;
    font-weight: 600;
}

.info-value {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
}

/* Ad Section */
.ad-section {
    padding: 20px 0 40px;
    text-align: center;
}

/* SEO Content Section */
.content-section {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 32px;
    margin-bottom: 40px;
}

.content-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.content-block {
    background-color: #f9fafb;
    padding: 32px;
    border-radius: 20px;
    border: 1px solid #f3f4f6;
}

.content-block h3, .faq-title {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.content-block p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.8;
}

/* FAQ Grid Layout */
.faq-wrap {
    padding-top: 20px;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.faq-item {
    background: #ffffff;
    padding: 24px;
    border-radius: 16px;
    border: 1px solid #f3f4f6;
}

.faq-item h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}

.q-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background-color: var(--accent-color);
    color: white;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 800;
    flex-shrink: 0;
}

.faq-item p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

.ad-label {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: block;
    letter-spacing: 0.2em;
}

.ad-banner {
    width: 100%;
    height: 90px;
    background: #f9fafb;
    border: 1px solid #f3f4f6;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-text {
    font-size: 13px;
    color: #d1d5db;
    font-weight: 500;
}

footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    background-color: #fafafa;
}

.footer-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

footer p {
    font-size: 14px;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .main-header {
        padding: 30px 0 40px;
    }
    .info-grid {
        grid-template-columns: 1fr;
    }
    .ad-banner {
        height: 60px;
    }
}