/* 기본 스타일 및 변수 */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #43e97b;
    --warning-color: #feca57;
    --danger-color: #ff6b6b;
    --info-color: #4facfe;
    --dark-bg: #1a1d29;
    --card-bg: #252836;
    --text-primary: #ffffff;
    --text-secondary: #b8b9c4;
    --border-color: #353849;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #1a1d29 0%, #2d3142 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* 헤더 */
.header {
    background: rgba(37, 40, 54, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--border-color);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo i {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav {
    display: flex;
    gap: 0.5rem;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(102, 126, 234, 0.1);
}

.nav-link.active {
    color: var(--text-primary);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
    border-bottom: 2px solid var(--primary-color);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--success-color);
    font-size: 0.9rem;
    font-weight: 500;
}

.status-indicator i {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.datetime {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 메인 컨텐츠 */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

/* 카드 공통 스타일 */
.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header i {
    color: var(--primary-color);
}

.card-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: rgba(102, 126, 234, 0.2);
    color: var(--text-primary);
    transform: scale(1.05);
}

.select-period {
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
}

.select-period:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 개요 카드 */
.overview-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.overview-card {
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.overview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: 1rem;
}

.card-content h3 {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.card-content .value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.card-content .unit {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-left: 0.25rem;
}

.card-trend {
    margin-top: 1rem;
    padding: 0.5rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.card-trend.positive {
    background: rgba(67, 233, 123, 0.1);
    color: var(--success-color);
}

.card-trend.negative {
    background: rgba(255, 107, 107, 0.1);
    color: var(--danger-color);
}

/* 차트 섹션 */
.charts-section {
    margin-bottom: 2rem;
}

.chart-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.chart-card {
    min-height: 400px;
}

.chart-card.full-width {
    grid-column: 1 / -1;
}

.card-body {
    position: relative;
}

/* 구성 요소 섹션 */
.components-section {
    margin-bottom: 2rem;
}

.section-header {
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-header i {
    color: var(--primary-color);
}

.components-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.component-card {
    background: var(--card-bg);
}

.component-header {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.component-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.component-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.component-icon.solar {
    color: #feca57;
}

.component-icon.wind {
    color: #4facfe;
}

.component-icon.ess {
    color: #43e97b;
}

.component-icon.grid {
    color: #667eea;
}

.status-badge {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge.active {
    background: rgba(67, 233, 123, 0.2);
    color: var(--success-color);
}

.status-badge.charging {
    background: rgba(79, 172, 254, 0.2);
    color: var(--info-color);
}

.component-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.component-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.component-stat .label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.component-stat .value {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    margin: 0.5rem 0;
}

.progress-fill {
    height: 100%;
    border-radius: 10px;
    transition: width 1s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-fill.solar {
    background: linear-gradient(90deg, #feca57, #ff9ff3);
}

.progress-fill.wind {
    background: linear-gradient(90deg, #4facfe, #00f2fe);
}

.progress-fill.ess {
    background: linear-gradient(90deg, #43e97b, #38f9d7);
}

.progress-fill.grid {
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.component-info {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.component-info span {
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.component-info i {
    color: var(--primary-color);
    font-size: 0.85rem;
}

/* 알림 섹션 */
.notifications-section {
    margin-bottom: 2rem;
}

.notification-card {
    max-width: 100%;
}

.notification-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.notification-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    border-left: 3px solid;
    transition: all 0.3s ease;
}

.notification-item:hover {
    background: rgba(255, 255, 255, 0.05);
    transform: translateX(5px);
}

.notification-item.info {
    border-left-color: var(--info-color);
}

.notification-item.warning {
    border-left-color: var(--warning-color);
}

.notification-item.danger {
    border-left-color: var(--danger-color);
}

.notification-item.success {
    border-left-color: var(--success-color);
}

.notification-item > i {
    font-size: 1.25rem;
    margin-top: 0.25rem;
}

.notification-item.info > i {
    color: var(--info-color);
}

.notification-item.warning > i {
    color: var(--warning-color);
}

.notification-item.danger > i {
    color: var(--danger-color);
}

.notification-item.success > i {
    color: var(--success-color);
}

.notification-content {
    flex: 1;
}

.notification-content p {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.notification-content .time {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* 푸터 */
.footer {
    background: var(--card-bg);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
}

.footer p {
    color: var(--text-secondary);
    margin: 0.25rem 0;
}

/* 반응형 디자인 */
@media (max-width: 1200px) {
    .chart-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav {
        width: 100%;
        justify-content: space-around;
    }

    .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }

    .header-right {
        width: 100%;
        justify-content: space-between;
    }

    .overview-cards {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .components-grid {
        grid-template-columns: 1fr;
    }

    .chart-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .overview-cards {
        grid-template-columns: 1fr;
    }

    .card-content .value {
        font-size: 1.75rem;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .nav-link {
        padding: 0.5rem;
        font-size: 0.85rem;
    }
}