/* /css/main.css - ERP 포털 메인 스타일시트 (최종 검증된 버전) */

/* 기본 리셋 및 설정 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ======================
   헤더 스타일
   ====================== */
.main-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2c3e50;
    letter-spacing: -0.5px;
}

.main-nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #666;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: #667eea;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
    background: #667eea;
    color: white;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* ======================
   메인 콘텐츠
   ====================== */
.main-content {
    padding: 40px 0;
}

.hero {
    text-align: center;
    margin-bottom: 50px;
    color: white;
    padding: 40px 0;
}

.hero h2 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    font-weight: 300;
    letter-spacing: -1px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero p {
    font-size: 1.3rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* 로딩 플레이스홀더 스타일 */
.loading-placeholder {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    margin: 20px 0;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-placeholder p {
    color: #666;
    font-size: 1.1rem;
    margin: 0;
}

/* ======================
   5x4 모듈 그리드
   ====================== */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(6, 1fr);
    gap: 25px;
    margin-bottom: 60px;
    min-height: 700px;
}

.module-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.module-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.module-card:hover::before {
    opacity: 1;
}

.module-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.module-icon {
    margin-bottom: 15px;
    position: relative;
}

.module-icon .icon {
    font-size: 2.8rem;
    display: block;
    transition: transform 0.3s ease;
}

.module-card:hover .module-icon .icon {
    transform: scale(1.1) rotate(5deg);
}

.module-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 10px;
    line-height: 1.3;
}

.module-card p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 15px;
    flex: 1;
}

.module-status {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    justify-content: center;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #27ae60;
    animation: pulse 2s infinite;
    box-shadow: 0 0 8px rgba(39, 174, 96, 0.3);
}

.status-indicator.offline {
    background: #ff0000;
    animation: none;
    box-shadow: 0 0 8px rgba(231, 76, 60, 0.3);
}

.status-indicator.warning {
    background: #f1c40f;
    box-shadow: 0 0 8px rgba(241, 196, 15, 0.3);
}

.status-indicator.error {
    background: #ff00ff;
    animation: none;
    box-shadow: 0 0 8px rgba(255, 107, 53, 0.3);
}

.status-indicator.developing {
    background: #9b59b6;
    box-shadow: 0 0 8px rgba(155, 89, 182, 0.3);
}

@keyframes pulse {
    0% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.7; 
        transform: scale(1.1);
    }
    100% { 
        opacity: 1; 
        transform: scale(1);
    }
}

.status-text {
    font-size: 0.8rem;
    color: #666;
    font-weight: 500;
}

/* ======================
   버튼 컨테이너
   ====================== */
.module-button-container {
    margin-top: auto;
    padding-top: 15px;
}

/* ======================
   버튼 스타일
   ====================== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
    width: 100%;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-disabled {
    background: #bdc3c7;
    color: #7f8c8d;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-disabled:hover {
    transform: none;
}

.btn-coming-soon {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    color: white;
    box-shadow: 0 4px 15px rgba(243, 156, 18, 0.3);
}

.btn-coming-soon:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(243, 156, 18, 0.4);
}

.btn-developing {
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
    color: white;
    box-shadow: 0 4px 15px rgba(155, 89, 182, 0.3);
}

.btn-developing:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(155, 89, 182, 0.4);
}

/* ======================
   모듈 상태별 스타일
   ====================== */
.module-card.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.module-card.disabled:hover {
    transform: none;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.module-card.coming-soon {
    background: linear-gradient(135deg, #ffeaa7 0%, #fab1a0 100%);
    color: #2d3436;
}

.module-card.coming-soon h3 {
    color: #2d3436;
}

.module-card.coming-soon p {
    color: #636e72;
}

.module-card.coming-soon::before {
    background: linear-gradient(90deg, #e17055, #fd79a8);
}

.module-card.developing {
    background: linear-gradient(135deg, #f3e2f8 0%, #d3a5fb 100%);
    color: #2d3436;
}

.module-card.developing h3 {
    color: #2d3436;
}

.module-card.developing p {
    color: #636e72;
}

.module-card.developing::before {
    background: linear-gradient(90deg, #9b59b6, #8e44ad);
}

/* ======================
   시스템 정보
   ====================== */
.system-info {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    margin-bottom: 40px;
}

.system-info h3 {
    margin-bottom: 30px;
    color: #2c3e50;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.info-item {
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 10px;
    border: 1px solid #dee2e6;
    transition: all 0.3s ease;
}

.info-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, #ffffff, #f8f9fa);
}

.info-item strong {
    color: #495057;
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.info-item span {
    color: #667eea;
    font-weight: 600;
    font-size: 1.2rem;
}

/* ======================
   푸터
   ====================== */
.main-footer {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 30px 0;
    text-align: center;
    backdrop-filter: blur(5px);
}

.main-footer p {
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.main-footer small {
    opacity: 0.7;
    font-size: 0.8rem;
}

.main-footer a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s ease;
}

.main-footer a:hover {
    color: #5a6fd8;
    text-decoration: underline;
}

/* ======================
   반응형 디자인
   ====================== */

/* 큰 화면 (1200px 이하) */
@media (max-width: 1200px) {
    .modules-grid {
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: repeat(8, 1fr);
    }
    
    .container {
        max-width: 1100px;
    }
    
    .hero h2 {
        font-size: 2.4rem;
    }
}

/* 중간 화면 (968px 이하) */
@media (max-width: 968px) {
    .modules-grid {
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: repeat(10, 1fr);
        gap: 20px;
    }
    
    .hero h2 {
        font-size: 2.2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .module-card {
        padding: 20px;
    }
    
    .module-icon .icon {
        font-size: 2.4rem;
    }
    
    .module-card h3 {
        font-size: 1.1rem;
    }
    
    .module-card p {
        font-size: 0.85rem;
    }
}

/* 태블릿 (768px 이하) */
@media (max-width: 768px) {
    .modules-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(15, 1fr);
        gap: 15px;
    }
    
    .hero {
        padding: 20px 0;
        margin-bottom: 30px;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .main-header .container {
        flex-direction: column;
        gap: 20px;
        padding: 15px 20px;
    }
    
    .logo h1 {
        font-size: 1.3rem;
    }
    
    .main-nav {
        gap: 20px;
    }
    
    .nav-link {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    
    .module-card {
        padding: 15px;
    }
    
    .module-icon .icon {
        font-size: 2.2rem;
    }
    
    .module-card h3 {
        font-size: 1rem;
        margin-bottom: 8px;
    }
    
    .module-card p {
        font-size: 0.8rem;
        margin-bottom: 12px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.85rem;
    }
    
    .system-info {
        padding: 25px;
    }
    
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .info-item {
        padding: 15px;
    }
}

/* 모바일 (480px 이하) */
@media (max-width: 480px) {
    .modules-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(30, 1fr);
        gap: 12px;
        min-height: auto;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .hero h2 {
        font-size: 1.8rem;
        line-height: 1.2;
    }
    
    .hero p {
        font-size: 0.95rem;
    }
    
    .main-header .container {
        padding: 10px 15px;
    }
    
    .logo {
        gap: 10px;
    }
    
    .logo h1 {
        font-size: 1.1rem;
    }
    
    .main-nav {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-link {
        padding: 5px 10px;
        font-size: 0.85rem;
    }
    
    .module-card {
        padding: 20px 15px;
        border-radius: 12px;
    }
    
    .module-icon .icon {
        font-size: 2.5rem;
    }
    
    .module-card h3 {
        font-size: 1.1rem;
        margin-bottom: 10px;
    }
    
    .module-card p {
        font-size: 0.85rem;
        margin-bottom: 15px;
        line-height: 1.4;
    }
    
    .btn {
        width: 100%;
        padding: 12px;
        font-size: 0.9rem;
    }
    
    .system-info {
        padding: 20px;
        border-radius: 12px;
    }
    
    .system-info h3 {
        font-size: 1.3rem;
        margin-bottom: 20px;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .info-item {
        padding: 15px;
        border-radius: 8px;
    }
    
    .info-item strong {
        font-size: 0.85rem;
    }
    
    .info-item span {
        font-size: 1.1rem;
    }
    
    .main-footer {
        padding: 20px 0;
    }
    
    .main-footer p {
        font-size: 0.9rem;
    }
    
    .main-footer small {
        font-size: 0.75rem;
    }
}

/* 초소형 화면 (320px 이하) */
@media (max-width: 320px) {
    .hero h2 {
        font-size: 1.6rem;
    }
    
    .logo h1 {
        font-size: 1rem;
    }
    
    .module-card {
        padding: 15px 10px;
    }
    
    .module-icon .icon {
        font-size: 2.2rem;
    }
    
    .module-card h3 {
        font-size: 1rem;
    }
    
    .module-card p {
        font-size: 0.8rem;
    }
    
    .system-info {
        padding: 15px;
    }
    
    .info-item {
        padding: 12px;
    }
}

/* ======================
   애니메이션 개선
   ====================== */
@media (prefers-reduced-motion: reduce) {
    .module-card,
    .btn,
    .nav-link,
    .info-item {
        transition: none;
    }
    
    .status-indicator {
        animation: none;
    }
    
    .module-card:hover .module-icon .icon {
        transform: none;
    }
}

/* ======================
   프린트 스타일
   ====================== */
@media print {
    .main-header,
    .main-footer {
        display: none;
    }
    
    .hero {
        color: #333;
    }
    
    .modules-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .module-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .btn {
        display: none;
    }
}