/* ===========================
   Energy Optimization Platform
   Main Stylesheet
   =========================== */

:root {
    /* Light Theme Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --danger-color: #dc2626;

    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-hover: #e2e8f0;

    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    /* Border Colors */
    --border-color: #e2e8f0;
    --border-dark: #cbd5e1;

    /* Industrial/SCADA Colors */
    --status-on: #10b981;
    --status-standby: #f59e0b;
    --status-off: #6b7280;
    --industrial-accent: #3b82f6;

    /* Layout */
    --header-height: 60px;
    --sidebar-width: 240px;
    --sidebar-collapsed-width: 60px;
    --log-height: 200px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===========================
   Global Layout
   =========================== */

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--industrial-accent));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 1.25rem;
}

.app-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.language-switcher {
    display: flex;
    gap: 0.5rem;
}

.lang-btn {
    padding: 0.5rem 0.75rem;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.lang-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.lang-btn:hover:not(.active) {
    background-color: var(--bg-hover);
}

/* Sidebar */
.app-sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height) - var(--log-height));
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    transition: width var(--transition-normal);
    z-index: 900;
    overflow: hidden;
}

.app-sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar-toggle {
    position: absolute;
    top: 1rem;
    right: -12px;
    width: 24px;
    height: 24px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 10;
}

.sidebar-toggle:hover {
    background-color: var(--primary-color);
    color: white;
}

.sidebar-nav {
    padding: 1.5rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.875rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border-left: 3px solid transparent;
    white-space: nowrap;
}

.nav-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    font-weight: 500;
}

.nav-icon {
    width: 20px;
    height: 20px;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.nav-label {
    opacity: 1;
    transition: opacity var(--transition-fast);
}

.app-sidebar.collapsed .nav-label {
    opacity: 0;
}

/* Main Content */
.app-main {
    margin-top: var(--header-height);
    margin-left: var(--sidebar-width);
    margin-bottom: var(--log-height);
    padding: 2rem;
    transition: margin-left var(--transition-normal);
    min-height: calc(100vh - var(--header-height) - var(--log-height));
}

.app-sidebar.collapsed ~ .app-main {
    margin-left: var(--sidebar-collapsed-width);
}

/* Emergency Stop Button */
.emergency-stop {
    position: fixed;
    bottom: calc(var(--log-height) + 1rem);
    left: 1rem;
    z-index: 1000;
}

.emergency-btn {
    padding: 1rem 1.5rem;
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.emergency-btn:hover {
    background-color: #b91c1c;
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(220, 38, 38, 0.3);
}

.emergency-btn:active {
    transform: translateY(0);
}

/* Log Window */
.log-window {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--log-height);
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    z-index: 800;
    display: flex;
    flex-direction: column;
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
}

.log-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.log-clear-btn {
    padding: 0.375rem 0.75rem;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.log-clear-btn:hover {
    background-color: var(--bg-hover);
}

.log-content {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem 1.5rem;
    font-family: 'Courier New', monospace;
    font-size: 0.813rem;
}

.log-entry {
    display: flex;
    gap: 1rem;
    padding: 0.25rem 0;
    border-bottom: 1px solid var(--bg-tertiary);
}

.log-timestamp {
    color: var(--text-muted);
    flex-shrink: 0;
}

.log-level {
    font-weight: 600;
    flex-shrink: 0;
    width: 70px;
}

.log-level.info {
    color: var(--primary-color);
}

.log-level.warning {
    color: var(--warning-color);
}

.log-level.error {
    color: var(--error-color);
}

.log-message {
    color: var(--text-primary);
}

/* ===========================
   Common Components
   =========================== */

/* Cards */
.card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-dark);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: var(--bg-hover);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal {
    background-color: var(--bg-primary);
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    margin-bottom: 1rem;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-body {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.modal-footer {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* Status Indicators */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    border-radius: 20px;
    font-size: 0.813rem;
    font-weight: 500;
}

.status-indicator::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-indicator.on {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--status-on);
}

.status-indicator.on::before {
    background-color: var(--status-on);
}

.status-indicator.standby {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--status-standby);
}

.status-indicator.standby::before {
    background-color: var(--status-standby);
}

.status-indicator.off {
    background-color: rgba(107, 114, 128, 0.1);
    color: var(--status-off);
}

.status-indicator.off::before {
    background-color: var(--status-off);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .app-sidebar {
        transform: translateX(-100%);
    }

    .app-main {
        margin-left: 0;
        padding: 1rem;
    }
}