:root {
    --ku-crimson: #8B1F41;
    --ku-gold: #8F8F8F;
    --ku-light-gray: #f5f5f5;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
    min-height: 100vh;
}

.header {
    background: linear-gradient(to right, var(--ku-crimson), #6b1731);
    color: white;
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    box-sizing: border-box;
}

.header h1 {
    font-size: 1.8em;
    margin: 0 0 0 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.ku-logo {
    width: 60px;
    height: auto;
    margin: 0;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3));
}

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

.contact-info {
    margin: 20px 0;
}

.contact-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    word-break: keep-all;
    overflow-wrap: break-word;
}

.contact-section:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.15);
}

.contact-section h2 {
    color: var(--ku-crimson);
    margin: 0 0 15px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--ku-crimson);
}

.contact-section p {
    margin: 10px 0;
    color: #333;
    line-height: 1.6;
    white-space: normal;
    max-width: 100%;
}

.contact-section a {
    color: var(--ku-crimson);
    text-decoration: none;
    transition: var(--transition);
}

.contact-section a:hover {
    color: var(--ku-gold);
}

.back-button {
    display: block;
    width: 200px;
    margin: 30px auto;
    padding: 12px;
    background: var(--ku-crimson);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    font-weight: 500;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
    background: #6b1731;
}

.update-toggle {
    cursor: pointer;
    user-select: none;
}

.toggle-icon {
    display: inline-block;
    transition: transform 0.3s ease;
}

.update-history {
    max-height: 300px;
    overflow-y: auto;
    padding-right: 10px;
    transition: max-height 0.3s ease-out;
}

.update-history.collapsed {
    display: none;
}

.update-toggle.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.click-guide {
    font-size: 0.7em;
    color: #666;
    font-weight: normal;
}

.update-item {
    border-bottom: 1px solid #eee;
    padding: 10px 0;
    margin-bottom: 10px;
}

.update-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.update-date {
    color: var(--ku-crimson);
    margin-bottom: 5px;
}

.update-history::-webkit-scrollbar {
    width: 8px;
}

.update-history::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.update-history::-webkit-scrollbar-thumb {
    background: var(--ku-crimson);
    border-radius: 4px;
}

.update-history::-webkit-scrollbar-thumb:hover {
    background: #6b1731;
}

.sub-section {
    margin: 15px 0;
    padding: 10px;
    border-left: 3px solid #8b1f41;
    background-color: rgba(139, 31, 65, 0.05);
}

.sub-section h3 {
    margin-top: 0;
    color: #8b1f41;
    font-size: 1.1em;
    margin-bottom: 10px;
}

.scroll-guide {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 15px;
    text-align: center;
    border-radius: 8px;
    animation: fadeIn 0.5s ease-in-out;
    z-index: 10;
    margin-bottom: 10px;
}

.update-items {
    position: relative;  /* 추가: 스크롤 가이드의 기준점 설정 */
}

.scroll-guide-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.scroll-icon {
    font-size: 1.2em;
    animation: scrollAnimation 1.5s infinite;
}

@keyframes scrollAnimation {
    0% { transform: translateY(-5px); }
    50% { transform: translateY(5px); }
    100% { transform: translateY(-5px); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@media (max-width: 768px) {
    .scroll-guide {
        display: none;
    }
}

@media (max-width: 1024px) {
    .container {
        padding: 15px;
        max-width: 90%;
    }

    .contact-section {
        padding: 20px;
    }

    .contact-section h2 {
        font-size: 1.4em;
    }

    .contact-section p {
        font-size: 1em;
        word-break: keep-all;
        line-height: 1.6;
    }

    .contact-section a {
        word-break: break-all;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 12px;
    }

    .header h1 {
        font-size: 1.3em;
    }

    .ku-logo {
        width: 35px;
    }

    .container {
        padding: 10px;
        max-width: 95%;
    }

    .contact-section {
        padding: 15px;
        margin-bottom: 15px;
    }

    .contact-section h2 {
        font-size: 1.1em;
        margin-bottom: 10px;
    }

    .contact-section p {
        font-size: 0.9em;
        margin: 8px 0;
        line-height: 1.4;
    }

    .contact-section a {
        font-size: 0.85em;
        word-break: break-all;
    }

    .back-button {
        width: 160px;
        padding: 10px;
        font-size: 0.9em;
        margin: 20px auto;
    }
}

@media (max-width: 375px) {
    .header h1 {
        font-size: 1.1em;
    }

    .ku-logo {
        width: 30px;
    }

    .contact-section h2 {
        font-size: 1em;
    }

    .contact-section p {
        font-size: 0.85em;
    }

    .back-button {
        width: 140px;
        font-size: 0.85em;
    }
}