/**
 * Industrial Control Panel Design System
 *
 * Dark-first design optimized for data-heavy dashboards on 1080p displays.
 * Google Fonts are imported automatically. No separate link tag needed.
 */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
    /* Backgrounds */
    --ds-bg-primary: #0f172a;
    --ds-bg-secondary: #1e293b;
    --ds-bg-tertiary: #334155;
    --ds-bg-input: #1e293b;
    --ds-bg-hover: #475569;

    /* Borders */
    --ds-border: #475569;
    --ds-border-light: #334155;

    /* Text */
    --ds-text-primary: #f1f5f9;
    --ds-text-secondary: #94a3b8;
    --ds-text-muted: #64748b;

    /* Accent - Electric Cyan */
    --ds-accent: #0ea5e9;
    --ds-accent-hover: #38bdf8;
    --ds-accent-muted: rgba(14, 165, 233, 0.15);

    /* Status Colors */
    --ds-success: #10b981;
    --ds-success-muted: rgba(16, 185, 129, 0.15);
    --ds-warning: #f59e0b;
    --ds-warning-muted: rgba(245, 158, 11, 0.15);
    --ds-danger: #ef4444;
    --ds-danger-muted: rgba(239, 68, 68, 0.15);
    --ds-info: #6366f1;
    --ds-info-muted: rgba(99, 102, 241, 0.15);

    /* Typography */
    --ds-font-mono: 'JetBrains Mono', monospace;
    --ds-font-sans: 'Inter', system-ui, sans-serif;

    /* Spacing */
    --ds-space-xs: 4px;
    --ds-space-sm: 8px;
    --ds-space-md: 16px;
    --ds-space-lg: 24px;
    --ds-space-xl: 32px;

    /* Border Radius */
    --ds-radius-sm: 4px;
    --ds-radius-md: 8px;
    --ds-radius-lg: 12px;

    /* Shadows */
    --ds-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --ds-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --ds-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --ds-shadow-accent: 0 4px 12px rgba(14, 165, 233, 0.3);

    /* ============================================
       BACKWARD COMPATIBILITY ALIASES (--oc-*)
       Legacy templates use --oc-* naming convention
       ============================================ */
    --oc-bg-primary: var(--ds-bg-primary);
    --oc-bg-secondary: var(--ds-bg-secondary);
    --oc-bg-tertiary: var(--ds-bg-tertiary);
    --oc-bg-input: var(--ds-bg-input);
    --oc-border: var(--ds-border);
    --oc-border-light: var(--ds-border-light);
    --oc-text-primary: var(--ds-text-primary);
    --oc-text-secondary: var(--ds-text-secondary);
    --oc-text-muted: var(--ds-text-muted);
    --oc-accent: var(--ds-accent);
    --oc-accent-hover: var(--ds-accent-hover);
    --oc-accent-muted: var(--ds-accent-muted);
    --oc-success: var(--ds-success);
    --oc-success-muted: var(--ds-success-muted);
    --oc-warning: var(--ds-warning);
    --oc-warning-muted: var(--ds-warning-muted);
    --oc-danger: var(--ds-danger);
    --oc-info: var(--ds-info);
    --oc-info-muted: var(--ds-info-muted);
    --oc-font-mono: var(--ds-font-mono);
    --oc-font-sans: var(--ds-font-sans);
}

/* Light mode overrides */
html:not(.dark) {
    --ds-bg-primary: #f8fafc;
    --ds-bg-secondary: #ffffff;
    --ds-bg-tertiary: #f1f5f9;
    --ds-bg-input: #ffffff;
    --ds-bg-hover: #e2e8f0;
    --ds-border: #e2e8f0;
    --ds-border-light: #f1f5f9;
    --ds-text-primary: #0f172a;
    --ds-text-secondary: #475569;
    --ds-text-muted: #94a3b8;
    --ds-accent: #0284c7;
    --ds-accent-hover: #0369a1;
    --ds-accent-muted: rgba(2, 132, 199, 0.1);
    --ds-success-muted: rgba(16, 185, 129, 0.1);
    --ds-warning-muted: rgba(245, 158, 11, 0.1);
    --ds-danger-muted: rgba(239, 68, 68, 0.1);
    --ds-info-muted: rgba(99, 102, 241, 0.1);
    --ds-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --ds-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --ds-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);
    --ds-shadow-accent: 0 4px 12px rgba(2, 132, 199, 0.2);

    /* Backward compatibility aliases for legacy templates */
    --oc-bg-primary: var(--ds-bg-primary);
    --oc-bg-secondary: var(--ds-bg-secondary);
    --oc-bg-tertiary: var(--ds-bg-tertiary);
    --oc-bg-input: var(--ds-bg-input);
    --oc-border: var(--ds-border);
    --oc-border-light: var(--ds-border-light);
    --oc-text-primary: var(--ds-text-primary);
    --oc-text-secondary: var(--ds-text-secondary);
    --oc-text-muted: var(--ds-text-muted);
    --oc-accent: var(--ds-accent);
    --oc-accent-hover: var(--ds-accent-hover);
    --oc-accent-muted: var(--ds-accent-muted);
    --oc-success: var(--ds-success);
    --oc-success-muted: var(--ds-success-muted);
    --oc-warning: var(--ds-warning);
    --oc-warning-muted: var(--ds-warning-muted);
    --oc-danger: var(--ds-danger);
    --oc-info: var(--ds-info);
    --oc-info-muted: var(--ds-info-muted);
}

/* ============================================
   BASE COMPONENTS
   ============================================ */

/* Container */
.ds-container {
    font-family: var(--ds-font-sans);
    color: var(--ds-text-primary);
    max-width: 1400px;
    margin: 0 auto;
}

/* Page Header */
.ds-page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--ds-border);
}

.ds-page-header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ds-page-icon {
    width: 48px;
    height: 48px;
    background: var(--ds-accent-muted);
    border: 2px solid var(--ds-accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ds-page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ds-text-primary);
    margin: 0;
    letter-spacing: -0.025em;
}

.ds-page-subtitle {
    font-size: 0.875rem;
    color: var(--ds-text-secondary);
    margin: 4px 0 0 0;
}

.ds-help-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--ds-bg-tertiary);
    border: 1px solid var(--ds-border);
    border-radius: 8px;
    color: var(--ds-text-secondary);
    text-decoration: none;
    font-size: 0.8125rem;
    transition: all 0.2s;
    white-space: nowrap;
}

.ds-help-btn:hover {
    background: var(--ds-bg-secondary);
    border-color: var(--ds-accent);
    color: var(--ds-accent);
}

/* Two-column layout */
.ds-layout-2col {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: var(--ds-space-lg);
    align-items: start;
}

@media (max-width: 1200px) {
    .ds-layout-2col {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   PANELS / CARDS
   ============================================ */

.ds-panel {
    background: var(--ds-bg-secondary);
    border: 1px solid var(--ds-border);
    border-radius: var(--ds-radius-lg);
    overflow: hidden;
}

.ds-panel + .ds-panel {
    margin-top: var(--ds-space-lg);
}

.ds-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--ds-space-md) 20px;
    background: var(--ds-bg-tertiary);
    border-bottom: 1px solid var(--ds-border);
}

.ds-panel-title {
    font-family: var(--ds-font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--ds-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0;
}

.ds-panel-body {
    padding: 20px;
}

/* Collapsible panels */
.ds-panel.collapsible .ds-panel-header {
    cursor: pointer;
    user-select: none;
    transition: background 0.15s ease;
}

.ds-panel.collapsible .ds-panel-header:hover {
    background: var(--ds-bg-secondary);
}

.ds-panel-toggle {
    display: flex;
    align-items: center;
    color: var(--ds-text-muted);
}

.ds-panel-toggle svg {
    transition: transform 0.2s ease;
}

.ds-panel.collapsed .ds-panel-toggle svg {
    transform: rotate(-90deg);
}

.ds-panel.collapsed .ds-panel-body {
    display: none;
}

.ds-panel-summary {
    font-family: var(--ds-font-mono);
    font-size: 0.75rem;
    color: var(--ds-accent);
    margin-left: auto;
    margin-right: var(--ds-space-md);
}

.ds-panel:not(.collapsed) .ds-panel-summary {
    display: none;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

.ds-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ds-text-primary);
    margin: 0;
    letter-spacing: -0.025em;
}

.ds-subtitle {
    font-size: 0.875rem;
    color: var(--ds-text-secondary);
    margin: var(--ds-space-xs) 0 0 0;
}

.ds-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--ds-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.ds-hint {
    font-size: 0.75rem;
    color: var(--ds-text-muted);
}

.ds-mono {
    font-family: var(--ds-font-mono);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */

.ds-input,
.ds-select,
.ds-textarea {
    font-family: var(--ds-font-mono);
    font-size: 0.875rem;
    padding: 10px 12px;
    background: var(--ds-bg-input);
    border: 1px solid var(--ds-border);
    border-radius: var(--ds-radius-md);
    color: var(--ds-text-primary);
    transition: all 0.15s ease;
    width: 100%;
}

.ds-input:focus,
.ds-select:focus,
.ds-textarea:focus {
    outline: none;
    border-color: var(--ds-accent);
    box-shadow: 0 0 0 3px var(--ds-accent-muted);
}

.ds-input::placeholder {
    color: var(--ds-text-muted);
}

.ds-input[readonly] {
    background: var(--ds-bg-tertiary);
    color: var(--ds-text-secondary);
    cursor: not-allowed;
}

.ds-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.ds-form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.ds-form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--ds-space-md);
}

.ds-form-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--ds-space-md);
}

/* ============================================
   BUTTONS
   ============================================ */

.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--ds-space-sm);
    padding: 10px 16px;
    font-family: var(--ds-font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--ds-radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
    border: none;
}

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

.ds-btn-primary:hover:not(:disabled) {
    background: var(--ds-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--ds-shadow-accent);
}

.ds-btn-secondary {
    background: var(--ds-bg-tertiary);
    color: var(--ds-text-secondary);
    border: 1px solid var(--ds-border);
}

.ds-btn-secondary:hover:not(:disabled) {
    background: var(--ds-bg-hover);
    color: var(--ds-text-primary);
    border-color: var(--ds-accent);
}

.ds-btn:disabled {
    background: var(--ds-bg-tertiary);
    color: var(--ds-text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.ds-btn-lg {
    padding: 14px 24px;
    font-size: 1rem;
    border-radius: var(--ds-radius-md);
}

.ds-btn-block {
    width: 100%;
}

/* ============================================
   BADGES
   ============================================ */

.ds-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: var(--ds-radius-sm);
    font-family: var(--ds-font-mono);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.ds-badge-success {
    background: var(--ds-success-muted);
    color: var(--ds-success);
}

.ds-badge-warning {
    background: var(--ds-warning-muted);
    color: var(--ds-warning);
}

.ds-badge-danger {
    background: var(--ds-danger-muted);
    color: var(--ds-danger);
}

.ds-badge-info {
    background: var(--ds-info-muted);
    color: var(--ds-info);
}

.ds-badge-accent {
    background: var(--ds-accent-muted);
    color: var(--ds-accent);
}

/* ============================================
   TABLES
   ============================================ */

.ds-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}

.ds-table th {
    background: var(--ds-bg-tertiary);
    font-family: var(--ds-font-mono);
    font-weight: 600;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ds-text-secondary);
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--ds-border);
}

.ds-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--ds-border-light);
    color: var(--ds-text-secondary);
}

.ds-table tr:hover td {
    background: var(--ds-bg-tertiary);
}

.ds-table-sticky th {
    position: sticky;
    top: 0;
    z-index: 10;
}

/* ============================================
   UTILITIES
   ============================================ */

.ds-text-accent { color: var(--ds-accent); }
.ds-text-success { color: var(--ds-success); }
.ds-text-warning { color: var(--ds-warning); }
.ds-text-danger { color: var(--ds-danger); }
.ds-text-muted { color: var(--ds-text-muted); }

.ds-bg-accent { background: var(--ds-accent-muted); }
.ds-bg-success { background: var(--ds-success-muted); }
.ds-bg-warning { background: var(--ds-warning-muted); }
.ds-bg-danger { background: var(--ds-danger-muted); }

.ds-mt-sm { margin-top: var(--ds-space-sm); }
.ds-mt-md { margin-top: var(--ds-space-md); }
.ds-mt-lg { margin-top: var(--ds-space-lg); }

.ds-mb-sm { margin-bottom: var(--ds-space-sm); }
.ds-mb-md { margin-bottom: var(--ds-space-md); }
.ds-mb-lg { margin-bottom: var(--ds-space-lg); }

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes ds-spin {
    to { transform: rotate(360deg); }
}

.ds-spinner {
    display: inline-block;
    width: 32px;
    height: 32px;
    border: 3px solid var(--ds-border);
    border-top-color: var(--ds-accent);
    border-radius: 50%;
    animation: ds-spin 0.8s linear infinite;
}

/* Loading Overlay - Covers parent with semi-transparent backdrop and spinner */
.ds-loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    border-radius: inherit;
    z-index: 5;
}

.ds-loading-text {
    font-family: var(--ds-font-mono);
    font-size: 0.75rem;
    color: var(--ds-text-secondary);
    margin-top: 8px;
}

/* Upload/submit button spinner - inline with button text */
.upload-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: ds-spin 0.8s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

@keyframes ds-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.ds-fade-in {
    animation: ds-fade-in 0.2s ease;
}

/* ============================================
   ADDITIONAL COMPONENTS (from reference implementation)
   ============================================ */

/* Dropzone - File upload area with hover states */
.ds-dropzone {
    border: 2px dashed var(--ds-border);
    border-radius: var(--ds-radius-md);
    padding: 32px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--ds-bg-tertiary);
}

.ds-dropzone:hover {
    border-color: var(--ds-accent);
    background: var(--ds-accent-muted);
}

.ds-dropzone.dragover {
    border-color: var(--ds-accent);
    background: var(--ds-accent-muted);
    transform: scale(1.01);
}

.ds-dropzone.file-selected {
    border-color: var(--ds-success);
    border-style: solid;
    background: var(--ds-success-muted);
}

.ds-dropzone-icon {
    margin-bottom: 12px;
    color: var(--ds-text-muted);
}

.ds-dropzone.file-selected .ds-dropzone-icon {
    color: var(--ds-success);
}

.ds-dropzone-text {
    font-size: 0.9375rem;
    color: var(--ds-text-secondary);
    margin: 0;
}

.ds-dropzone-hint {
    font-size: 0.75rem;
    color: var(--ds-text-muted);
    margin-top: 4px;
}

.ds-dropzone.file-selected .ds-dropzone-text {
    color: var(--ds-success);
    font-weight: 600;
}

/* Sidebar - Sticky positioning for preview panels */
.ds-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: sticky;
    top: 80px;
    max-width: 380px;
}

@media (max-width: 1200px) {
    .ds-sidebar {
        position: static;
        max-width: 100%;
    }
}

/* Preview Stat - Stat cards with icon, value, and label */
.ds-preview-stat {
    background: var(--ds-bg-secondary);
    padding: 16px;
    text-align: center;
}

.ds-preview-value {
    font-family: var(--ds-font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ds-accent);
    line-height: 1;
}

.ds-preview-label {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--ds-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    margin-top: 6px;
}

.ds-preview-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--ds-border-light);
}

/* Enhanced collapsible transitions */
.ds-panel.collapsible .ds-panel-body {
    max-height: 5000px;
    overflow: hidden;
    transition: max-height 0.3s ease-in-out;
}

.ds-panel.collapsible.collapsed .ds-panel-body {
    max-height: 0;
    transition: max-height 0.2s ease-in-out;
}

/* ============================================
   MOBILE RESPONSIVE UTILITIES
   ============================================ */

/* Form grid stacking */
@media (max-width: 768px) {
    .ds-form-grid {
        grid-template-columns: 1fr;
    }

    .ds-form-grid-3 {
        grid-template-columns: 1fr;
    }

    /* Touch target utility */
    .ds-touch-target {
        min-height: 44px;
        min-width: 44px;
        padding: 10px 14px;
    }

    /* Modal responsive */
    .modal-content,
    .modal-box {
        width: calc(100% - 16px);
        max-height: 85vh;
    }

    /* Page header stacking */
    .ds-page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    /* Stats grid utility */
    .ds-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Toast container mobile */
    .toast {
        right: 8px;
        left: 8px;
        max-width: none;
    }
}

@media (max-width: 375px) {
    .ds-stats-grid {
        grid-template-columns: 1fr;
    }
}