/* --- 1. 변수 & 전역 스타일 --- */
:root {
    --primary-color: #002855; /* 짙은 네이비 */
    --accent-color: #007bff;   /* 밝은 파랑 */
    --secondary-color: #f8f9fa; /* 매우 밝은 회색 (배경) */
    --text-color: #343a40;      /* 기본 텍스트 */
    --text-light: #6c757d;      /* 연한 텍스트 */
    --border-color: #dee2e6;    /* 테두리 */
    --white-color: #ffffff;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --danger-color: #dc3545;
    --box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    --border-radius: 12px;
}

body {
    margin: 0;
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.7;
    background-color: var(--secondary-color);
    color: var(--text-color);
    scroll-behavior: smooth;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}

.section {
    background-color: var(--white-color);
    padding: 40px;
    margin-bottom: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.section h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 15px;
    color: var(--primary-color);
    font-weight: 700;
}

.section-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px auto;
    color: var(--text-light);
    font-size: 1.1rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s;
}
a:hover {
    color: var(--primary-color);
}

/* --- 2. 헤더 & 네비게이션 --- */
header {
    background: var(--white-color);
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    height: 70px;
}

header h1 a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

header .desktop-nav { display: none; }
header .desktop-nav a {
    margin: 0 15px;
    padding: 5px 0;
    font-weight: 700;
    color: var(--text-color);
    border-bottom: 2px solid transparent;
    transition: color 0.3s, border-color 0.3s;
}
header .desktop-nav a:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

/* 관리자 메뉴 버튼 */
.admin-link {
    display: inline-flex;
    align-items: center;
    font-weight: bold;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--white-color) !important;
    transition: opacity 0.3s;
}
.admin-link:hover { opacity: 0.85; }
.admin-link i { margin-right: 6px; }
.admin-member { background-color: var(--success-color); }
.admin-schedule { 
    background-color: var(--warning-color); 
    color: var(--text-color) !important;
}
.admin-teacher { 
    background-color: var(--info-color); 
    color: var(--white-color) !important; 
}
.admin-logout { background-color: var(--danger-color); }
.admin-login-button {
    background-color: var(--primary-color);
    color: var(--white-color) !important;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 700;
    transition: background-color 0.3s;
}
.admin-login-button:hover {
    background-color: var(--accent-color);
}

/* 모바일 메뉴 버튼 (햄버거) */
.menu-btn {
    display: block;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    z-index: 1002;
}
.menu-btn .icon {
    display: block;
    width: 28px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 5px 0;
    transition: all 0.3s;
}
.menu-btn.active .icon:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-btn.active .icon:nth-child(2) { opacity: 0; }
.menu-btn.active .icon:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* 모바일 네비게이션 */
.mobile-nav {
    display: block;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--white-color);
    text-align: center;
    padding-top: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transform: translateY(-120%);
    transition: transform 0.4s ease-in-out;
    z-index: 999;
}
.mobile-nav.active {
    transform: translateY(0);
}
.mobile-nav a {
    display: block;
    color: var(--text-color);
    padding: 15px 0;
    text-decoration: none;
    font-weight: bold;
    border-bottom: 1px solid var(--border-color);
}
.mobile-nav .mobile-admin-menu {
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* --- 3. 히어로 섹션 --- */
.hero {
    position: relative;
    height: 70vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #333;
}
.hero-video {
    position: absolute;
    top: 50%; left: 50%;
    min-width: 100%; min-height: 100%;
    width: auto; height: auto;
    object-fit: cover;
    transform: translate(-50%, -50%);
    z-index: 1;
    filter: brightness(0.6);
}
.hero-text {
    position: relative;
    z-index: 2;
    color: white;
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    padding: 0 20px;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
}

/* --- 4. 섹션별 스타일 --- */
/* 센터 소개 (About) */
.feature-list { margin: 45px 0; }
.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 25px;
    margin-bottom: 30px;
}
.feature-icon {
    font-size: 2.2rem;
    color: var(--accent-color);
    width: 50px;
    text-align: center;
    margin-top: 5px;
}
.feature-text h3 {
    margin: 0 0 8px 0;
    color: var(--primary-color);
    font-size: 1.25rem;
}
.feature-text p { margin: 0; }
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 40px;
}
.photo-grid img {
    width: 100%; height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
}
.photo-grid img:hover { transform: scale(1.05); }

/* 정보 박스 (무료체험, 위치안내 등) */
.info-box {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    margin-top: 40px;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 1.1rem;
}
.info-box i { font-size: 1.5rem; }
.trial-box {
    background-color: #fff3cd;
    color: #664d03;
    border: 1px solid #ffecb5;
}

/* 프로그램 카드 */
.program-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}
.program-card {
    background: var(--white-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 25px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}
.program-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}
.program-card h3 {
    margin: 0 0 5px 0;
    color: var(--primary-color);
    font-size: 1.4rem;
}
.program-card .instructor {
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 15px;
}
.program-card p {
    flex-grow: 1;
    margin: 0 0 20px 0;
    color: var(--text-light);
}
.apply-btn {
    display: inline-block;
    background-color: var(--success-color);
    color: white !important;
    padding: 12px 20px;
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
    transition: background-color 0.2s;
}
.apply-btn:hover {
    background-color: #218838;
}

/* 강사 카드 */
.trainer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 25px;
}
.trainer-card {
    background: var(--white-color);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    color: var(--text-color);
}
.trainer-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}
.trainer-card img {
    border-radius: 50%;
    width: 120px; height: 120px;
    object-fit: cover;
    margin-bottom: 15px;
    border: 4px solid #e0f0ff;
}
.trainer-info strong {
    display: block;
    font-size: 1.1rem;
}
.trainer-info span {
    font-size: 0.9em;
    color: var(--text-light);
}

/* 시간표 */
.timetable-wrapper {
    overflow-x: auto;
    text-align: center;
}
.gx-timetable {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}
.gx-timetable th, .gx-timetable td {
    border: 1px solid var(--border-color);
    padding: 12px;
    text-align: center;
    min-width: 100px;
    vertical-align: middle;
}
.gx-timetable th {
    background-color: var(--primary-color);
    color: var(--white-color);
}
.gx-timetable .time-slot {
    font-weight: 700;
    background-color: var(--secondary-color);
}
.class-cell {
    position: relative;
    background-color: #e9f5ff;
}
.class-cell.clickable {
    cursor: pointer;
    transition: background-color 0.3s;
}
.class-cell.clickable:hover {
    background-color: #d0eaff;
}
.class-link {
    color: inherit;
    display: block;
    padding: 5px;
}
.class-link .class-name { font-weight: 700; }
.class-link .teacher-name { font-size: 0.9em; color: var(--text-light); }
.student-count-badge {
    position: absolute;
    top: 5px; right: 5px;
    background-color: var(--accent-color);
    color: white;
    width: 24px; height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8em;
    font-weight: 700;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* 대관 안내 */
.special-offer-box {
    background: linear-gradient(135deg, #ffc107, #ff9800);
    color: #333;
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    margin: 40px 0;
}
.special-offer-box .icon { font-size: 2.5rem; margin-bottom: 10px; }
.special-offer-box h3 { margin: 0; font-size: 1.8rem; }
.rental-guide-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.guide-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    background-color: var(--secondary-color);
    padding: 20px;
    border-radius: var(--border-radius);
}
.guide-icon { font-size: 1.5rem; color: var(--accent-color); width: 30px; margin-top: 5px; }
.guide-text h4 { margin: 0 0 5px 0; font-size: 1.1rem; color: var(--primary-color); }
.guide-text p { margin: 0; }
.guide-contact {
    grid-column: 1 / -1;
    text-align: center;
    margin-top: 20px;
}

/* FAQ 아코디언 */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}
.faq-item { border-bottom: 1px solid var(--border-color); }
.faq-item:last-child { border-bottom: none; }
.faq-question {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    padding: 20px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-color);
    transition: background-color 0.2s;
}
.faq-question:hover { background-color: var(--secondary-color); }
.faq-question i { transition: transform 0.3s ease; }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
    background-color: var(--secondary-color);
}
.faq-answer p {
    padding: 0 20px 20px 20px;
    margin: 0;
    color: var(--text-light);
}

/* ▼▼▼▼▼ '오시는 길' 섹션 추가 스타일 ▼▼▼▼▼ */
.parking-info-box {
    background-color: var(--secondary-color);
    border-radius: var(--border-radius);
    padding: 30px;
    margin: 40px 0;
}
.parking-info-box h3 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 25px;
    font-size: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}
.parking-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}
.parking-option {
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 8px;
    background-color: var(--white-color);
}
.parking-option h4 {
    margin: 0 0 10px 0;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.parking-label {
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 5px;
    color: white;
}
.parking-label.building { background-color: var(--accent-color); }
.parking-label.public { background-color: var(--success-color); }
.parking-option p {
    margin: 5px 0 0 0;
    color: var(--text-light);
    font-size: 0.95rem;
}
.parking-option .map-link-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 8px 15px;
    background-color: var(--text-light);
    color: var(--white-color);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    transition: background-color 0.3s;
}
/* ▼▼▼▼▼ 수정된 부분 ▼▼▼▼▼ */
.parking-option .map-link-btn:hover {
    background-color: var(--text-color); /* <-- --text-dark를 --text-color로 변경 */
}
/* ▲▲▲▲▲ 수정된 부분 ▲▲▲▲▲ */
.parking-option .map-link-btn i {
    margin-right: 6px;
}
.contact-details {
    text-align: center;
    margin-top: 40px;
    line-height: 1.8;
}
.map-container { text-align: center; margin-top: 20px; }
.map-container img {
    width: 100%; max-width: 800px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}
.map-container p { margin-top: 10px; font-size: 0.95rem; color: var(--text-light); }
/* ▲▲▲▲▲ '오시는 길' 섹션 추가 스타일 ▲▲▲▲▲ */


/* 로딩/에러 메시지 */
.loading-spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px; height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.timetable-wrapper p { text-align: center; }
.info-message, .error-message {
    padding: 20px;
    border-radius: var(--border-radius);
    font-weight: 700;
    text-align: center;
}
.error-message {
    color: var(--danger-color);
    background-color: #f8d7da;
}

/* --- 5. 푸터 --- */
footer {
    background: var(--primary-color);
    color: var(--white-color);
    padding: 40px 20px;
    text-align: center;
    font-size: 0.9rem;
    margin-top: 30px;
}

/* --- 6. 모달 --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0; top: 0;
    width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.6);
    justify-content: center;
    align-items: center;
}
.modal-content {
    background-color: var(--white-color);
    padding: 30px;
    width: 90%;
    max-width: 400px;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    position: relative;
}
.modal-content h2 { margin-top: 0; }
.close-btn {
    color: #aaa;
    position: absolute;
    top: 10px; right: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}
.close-btn:hover, .close-btn:focus { color: black; }
.modal-content input[type="text"], .modal-content input[type="password"] {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-sizing: border-box;
}
.modal-content button {
    background-color: var(--primary-color);
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: none;
    cursor: pointer;
    width: 100%;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
}
#login-error {
    color: var(--danger-color);
    font-size: 0.9rem;
    margin-top: 10px;
    text-align: center;
    min-height: 1.2em;
}

/* --- 7. 반응형 디자인 --- */
@media (min-width: 992px) {
    header { padding: 0 40px; }
    .menu-btn { display: none; }
    header .desktop-nav { display: flex; align-items: center; }
    .hero-text { font-size: 2.8rem; }
    .section { padding: 70px 40px; }
    .parking-grid { grid-template-columns: 1fr 1fr; }
}