/* DESIGN SYSTEM & VARIABLES */
:root {
    --bg-main: #0b0f19;
    --bg-card: rgba(17, 24, 39, 0.75);
    --bg-card-hover: rgba(31, 41, 55, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(14, 165, 233, 0.3);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    /* Voltages and Wires */
    --color-r: #ef4444; /* 24V Red Hot */
    --color-c: #0284c7; /* 24V Common Blue */
    --color-l1: #1e293b; /* Line Black Hot */
    --color-l2: #e2e8f0; /* Line White Neutral */
    
    --color-energized: #22c55e; /* Glowing green for active path */
    --color-tripped: #f43f5e; /* Warning pink-red */
    --color-inactive: #334155; /* Dim grey-blue for dead paths */
    
    /* Accents */
    --accent-primary: #0ea5e9;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    
    /* Shadows and Glows */
    --glow-energized: 0 0 10px rgba(34, 197, 94, 0.6), 0 0 20px rgba(34, 197, 94, 0.3);
    --glow-danger: 0 0 10px rgba(239, 68, 68, 0.6), 0 0 20px rgba(239, 68, 68, 0.3);
    --glow-blue: 0 0 10px rgba(14, 165, 233, 0.5);
    --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;
    
    --border-radius-sm: 6px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    line-height: 1.5;
}

/* APP CONTAINER & SCROLLBARS */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 16px;
    gap: 16px;
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* HEADER STYLE */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 16px 24px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-card);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 0 10px rgba(14, 165, 233, 0.45));
}

.technical-logo {
    width: 42px;
    height: 42px;
    overflow: visible;
}

.logo-board {
    fill: rgba(15, 23, 42, 0.95);
    stroke: rgba(148, 163, 184, 0.5);
    stroke-width: 1.4;
}

.logo-wire {
    fill: none;
    stroke-linecap: square;
    stroke-linejoin: round;
    stroke-width: 3.2;
}

.logo-wire.primary {
    stroke: #38bdf8;
    filter: drop-shadow(0 0 3px rgba(56, 189, 248, 0.75));
}

.logo-wire.secondary {
    stroke: #22c55e;
    filter: drop-shadow(0 0 3px rgba(34, 197, 94, 0.65));
}

.logo-wire.tertiary {
    stroke: #f59e0b;
    stroke-dasharray: 4 3;
    opacity: 0.85;
}

.logo-node {
    stroke: #0f172a;
    stroke-width: 2;
}

.logo-node.input {
    fill: #38bdf8;
}

.logo-node.relay {
    fill: #22c55e;
}

.logo-node.sensor {
    fill: #f59e0b;
}

.logo-node.output {
    fill: #f8fafc;
}

.logo-symbol {
    fill: none;
    stroke: #e2e8f0;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.logo-text h1 {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 1.5px;
    color: #fff;
    background: linear-gradient(135deg, #fff 0%, var(--accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text span {
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 600;
}

.controls-group {
    display: flex;
    align-items: center;
    gap: 16px;
}

.level-selector-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.btn-select {
    background: #111827;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 32px 8px 12px;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 240px;
    max-width: min(320px, 40vw);
    appearance: auto;
    -webkit-appearance: menulist;
}
.btn-select:hover {
    background: #1f2937;
    border-color: var(--accent-primary);
}
.btn-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.25);
}
.btn-select option {
    background-color: #ffffff;
    color: #111827;
}
.btn-select option:checked,
.btn-select option:hover {
    background-color: #e0f2fe;
    color: #0c4a6e;
}

/* BUTTONS */
.btn {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    outline: none;
}

.btn-primary {
    background: var(--accent-primary);
    color: #fff;
    box-shadow: 0 4px 14px 0 rgba(14, 165, 233, 0.3);
}
.btn-primary:hover {
    background: #0284c7;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px 0 rgba(14, 165, 233, 0.4);
}
.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.10);
    color: #fff;
    border-color: var(--text-secondary);
}

.btn-success {
    background: var(--accent-success);
    color: #fff;
    box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.3);
}
.btn-success:hover {
    background: #059669;
    transform: translateY(-1px);
}

.btn-icon {
    padding: 8px;
    font-size: 16px;
}

.btn-small {
    padding: 4px 8px;
    font-size: 12px;
}

.btn-large {
    padding: 14px 28px;
    font-size: 16px;
    border-radius: var(--border-radius-md);
    letter-spacing: 0.5px;
}

/* MAIN LAYOUT split styling */
.app-main {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 16px;
    flex: 1;
}

@media (max-width: 1024px) {
    .app-main {
        grid-template-columns: 1fr;
    }
}

/* LEFT PANEL CARDS */
.left-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.panel-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card-header {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge {
    background: rgba(14, 165, 233, 0.15);
    color: var(--accent-primary);
    border: 1px solid var(--border-highlight);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 30px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.description-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.equipment-illustration {
    border-bottom: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.25);
    padding: 8px 8px 0;
}

.equipment-illustration.hidden {
    display: none;
}

.equipment-svg {
    display: block;
    width: 100%;
    height: auto;
    max-height: 200px;
    border-radius: 0 0 8px 8px;
}

.tier-badge {
    margin-left: 6px;
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border-color: rgba(245, 158, 11, 0.35);
}

.tier-badge.hidden {
    display: none;
}

.tier-badge.expert {
    background: rgba(168, 85, 247, 0.15);
    color: #c084fc;
    border-color: rgba(168, 85, 247, 0.35);
}

#sim-controls-section {
    display: none;
}

#sim-controls-section.active {
    display: block;
}

.level-objectives h3,
.control-subsection h3 {
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    color: #fff;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    border-left: 2px solid var(--accent-primary);
    padding-left: 8px;
}

.checklist {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.checklist li {
    font-size: 13px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    color: var(--text-secondary);
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
}

.checklist li.checked {
    color: #fff;
    background: rgba(16, 185, 129, 0.06);
    border-color: rgba(16, 185, 129, 0.2);
}

.checklist li.checked .check-box {
    color: var(--accent-success);
    font-weight: bold;
}

.checklist li.failed {
    color: #fff;
    background: rgba(239, 68, 68, 0.06);
    border-color: rgba(239, 68, 68, 0.2);
}

.checklist li.failed .check-box {
    color: var(--accent-danger);
    font-weight: bold;
}

.check-box {
    flex-shrink: 0;
    font-size: 14px;
    line-height: 1;
}

/* SYSTEM CONTROL BOARD (Thermostat / Safeties) */
.control-subsection {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.section-hint {
    font-size: 12px;
    color: var(--text-muted);
}

.tstat-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.tstat-toggle {
    display: flex;
    align-items: center;
    position: relative;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    user-select: none;
    transition: all 0.2s ease;
}

.tstat-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-secondary);
}

.tstat-toggle input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.toggle-slider {
    position: relative;
    height: 18px;
    width: 32px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin-right: 10px;
    transition: .3s;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 12px;
    width: 12px;
    left: 2px;
    bottom: 2px;
    background-color: var(--text-secondary);
    transition: .3s;
    border-radius: 50%;
}

.tstat-toggle input:checked + .toggle-slider {
    background-color: var(--accent-success);
    border-color: rgba(16, 185, 129, 0.3);
}

.tstat-toggle input:checked + .toggle-slider:before {
    transform: translateX(14px);
    background-color: white;
}

.tstat-toggle input:checked ~ .toggle-label {
    color: #fff;
    font-weight: 600;
}

.toggle-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* FAULT GRID (Trip buttons) */
.fault-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.btn-fault {
    background: rgba(16, 185, 129, 0.05);
    color: var(--accent-success);
    border: 1px solid rgba(16, 185, 129, 0.2);
    font-size: 12px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}
.btn-fault:hover {
    background: rgba(16, 185, 129, 0.1);
}

.btn-fault.tripped {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-danger);
    border-color: rgba(239, 68, 68, 0.4);
    font-weight: 600;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.15);
    animation: pulse-border-red 1.5s infinite;
}

/* WORKSPACE: LADDER EDITOR */
.workspace-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.ladder-workspace {
    display: flex;
    flex-direction: column;
    gap: 20px;
    flex: 1;
}

.ladder-section {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-card);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    overflow-x: auto;
}

.ladder-title-banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 8px;
}

.voltage-label {
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.control-voltage-section .voltage-label {
    color: var(--accent-primary);
}

.line-voltage-section .voltage-label {
    color: var(--accent-warning);
}

/* LADDER BOARD */
.ladder-board {
    display: flex;
    position: relative;
    padding: 10px 0;
    min-width: min(100%, 650px);
}

.ladder-workspace.layout-compact .ladder-board {
    min-width: min(100%, 480px);
}

/* Vertical Rails */
.rail {
    width: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border-radius: 4px;
    z-index: 10;
}

.rail::before {
    content: '';
    position: absolute;
    top: -10px;
    bottom: -10px;
    width: 6px;
    border-radius: 3px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
}

.rail-red::before {
    background-color: var(--color-r);
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.4);
}
.rail-blue::before {
    background-color: var(--color-c);
    box-shadow: 0 0 10px rgba(2, 132, 199, 0.4);
}
.rail-black::before {
    background-color: #475569;
    box-shadow: 0 0 10px rgba(71, 85, 105, 0.4);
}
.rail-white::before {
    background-color: #cbd5e1;
    box-shadow: 0 0 10px rgba(203, 213, 225, 0.4);
}

/* Active glows on Rails when simulating */
.simulating .rail-red::before {
    background-color: #ef4444;
    box-shadow: 0 0 15px #ef4444;
}
.simulating .rail-blue::before {
    background-color: #38bdf8;
    box-shadow: 0 0 15px #38bdf8;
}
.simulating .rail-black::before {
    background-color: #f8fafc;
    box-shadow: 0 0 15px #f8fafc;
}
.simulating .rail-white::before {
    background-color: #94a3b8;
    box-shadow: 0 0 10px #94a3b8;
}

.rail-label {
    position: absolute;
    top: -24px;
    font-size: 11px;
    font-weight: 700;
    white-space: nowrap;
}

.rail-left .rail-label {
    left: 0;
}
.rail-right .rail-label {
    right: 0;
}

/* Rungs container */
.rungs-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 32px;
    padding: 0 10px;
}

/* Horizontal Rung line */
.rung {
    display: flex;
    align-items: center;
    position: relative;
    height: 70px;
}

/* The actual wire line behind rungs */
.rung::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 3px;
    background-color: var(--color-inactive);
    z-index: 1;
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.rung.wire-energized::after {
    background-color: var(--color-energized);
    box-shadow: var(--glow-energized);
}

.rung-label-num {
    position: absolute;
    left: -32px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

/* Cells/Slots in rungs — line: [controls…] gap [load]  |  neutral: [controls…] [load] [N-side…] */
.rung-grid {
    position: relative;
    z-index: 5;
    display: grid;
    width: 100%;
    align-items: center;
    height: 100%;
    padding: 0 16px;
    grid-template-columns:
        repeat(var(--line-slot-count, 3), var(--slot-width, 110px))
        minmax(6px, 1fr)
        var(--load-width, 110px);
}

.rung-grid.has-neutral-slots {
    grid-template-columns:
        repeat(var(--line-slot-count, 2), var(--slot-width))
        var(--load-width)
        repeat(var(--neutral-slot-count, 1), var(--slot-width));
}

.control-voltage-section .rung-grid {
    --slot-width: 110px;
    --load-width: 110px;
}

.line-voltage-section .rung-grid {
    --slot-width: 130px;
    --load-width: 130px;
}

.ladder-workspace.layout-compact .rungs-container {
    gap: 18px;
}

.ladder-workspace.layout-compact .rung {
    height: 52px;
}

.ladder-workspace.layout-compact .control-voltage-section .rung-grid {
    --slot-width: 64px;
    --load-width: 72px;
    padding: 0 8px;
}

.ladder-workspace.layout-compact .line-voltage-section .rung-grid {
    --slot-width: 76px;
    --load-width: 84px;
    padding: 0 8px;
}

.ladder-workspace.layout-compact .slot {
    height: 46px;
    border-width: 1.5px;
}

.ladder-workspace.layout-compact .slot:hover {
    transform: none;
}

.ladder-workspace.layout-compact .symbol-svg {
    height: 26px;
    stroke-width: 1.8;
}

.ladder-workspace.layout-compact .symbol-label {
    font-size: 6px;
    margin-top: 1px;
    letter-spacing: 0;
}

.ladder-workspace.layout-compact .slot-placeholder {
    font-size: 7px;
    letter-spacing: 0;
    line-height: 1.2;
}

.ladder-workspace.layout-compact .slot-placeholder span {
    font-size: 14px;
    margin-bottom: 0;
}

.ladder-workspace.layout-compact .component-wrapper {
    padding: 2px;
}

.ladder-workspace.layout-compact .slot-clear-btn {
    width: 14px;
    height: 14px;
    font-size: 9px;
    top: -4px;
    right: -4px;
}

.ladder-workspace.layout-compact .rung-label-num {
    left: -28px;
    width: 16px;
    height: 16px;
    font-size: 9px;
}

.ladder-workspace.layout-dense .control-voltage-section .rung-grid {
    --slot-width: 54px;
    --load-width: 62px;
}

.ladder-workspace.layout-dense .line-voltage-section .rung-grid {
    --slot-width: 66px;
    --load-width: 74px;
}

.ladder-workspace.layout-dense .rung {
    height: 48px;
}

.ladder-workspace.layout-dense .slot {
    height: 42px;
}

.ladder-workspace.layout-dense .symbol-svg {
    height: 22px;
}

.ladder-workspace.layout-dense .symbol-label {
    display: none;
}

.load-slot {
    grid-column: auto;
}

.slot-neutral {
    border-color: rgba(148, 163, 184, 0.4);
    background: rgba(148, 163, 184, 0.08);
}

.slot-neutral:hover {
    border-color: #94a3b8;
    background: rgba(148, 163, 184, 0.12);
}

.slot-side-badge {
    position: absolute;
    bottom: 2px;
    right: 4px;
    font-size: 7px;
    font-weight: 800;
    color: #94a3b8;
    letter-spacing: 0.5px;
    pointer-events: none;
}

.ladder-workspace.layout-compact .slot-side-badge {
    font-size: 6px;
    bottom: 1px;
    right: 2px;
}

/* Individual Slot styling */
.slot {
    background: #0f172a;
    border: 2px dashed rgba(255, 255, 255, 0.15);
    height: 64px;
    width: 100%;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
}

.slot:hover {
    border-color: var(--accent-primary);
    background: rgba(14, 165, 233, 0.05);
    box-shadow: var(--glow-blue);
    transform: scale(1.02);
}

.slot.occupied {
    border-style: solid;
    border-color: rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.03);
}

.slot.occupied:hover {
    border-color: var(--accent-primary);
}

.slot-clear-btn {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 18px;
    height: 18px;
    background: var(--accent-danger);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: bold;
    border: 1px solid rgba(0, 0, 0, 0.2);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 10;
}

.slot:hover .slot-clear-btn {
    opacity: 1;
}

.slot-placeholder {
    font-size: 10px;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
    pointer-events: none;
}

.slot-placeholder span {
    display: block;
    font-size: 18px;
    margin-bottom: 2px;
}

/* Wire connection segments inside grid (to bridge elements visually) */
.wire-gap {
    position: relative;
    height: 100%;
    pointer-events: none;
}
.wire-gap::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 3px;
    background-color: inherit;
    z-index: 1;
}

/* COMPONENT SYMBOLS INSIDE SLOTS */
.component-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: 4px;
    position: relative;
}

.symbol-svg {
    width: 100%;
    height: 40px;
    stroke: var(--text-primary);
    stroke-width: 2.2;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: stroke 0.2s ease, filter 0.2s ease;
}

.symbol-label {
    font-size: 9px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 2px;
    text-align: center;
    max-width: 95%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Energized components */
.simulating .slot.energized {
    border-color: var(--accent-success);
    box-shadow: var(--glow-energized);
}

.simulating .slot.energized .symbol-svg {
    stroke: var(--color-energized);
    filter: drop-shadow(0 0 4px var(--accent-success));
}

.simulating .slot.energized .symbol-label {
    color: #fff;
    text-shadow: 0 0 5px rgba(34, 197, 94, 0.4);
}

/* Tripped/Faulty components */
.slot.tripped {
    border-color: var(--accent-danger) !important;
    background: rgba(239, 68, 68, 0.05) !important;
    animation: shake-small 0.5s ease;
}

.slot.tripped .symbol-svg {
    stroke: var(--color-tripped) !important;
    filter: drop-shadow(0 0 4px var(--accent-danger));
}

.slot.tripped .symbol-label {
    color: var(--color-tripped) !important;
}

/* ACTIONS BAR */
.simulation-actions-bar {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-card);
}

.simulation-status {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.badge-status {
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
    font-weight: 700;
    font-size: 12px;
    text-transform: uppercase;
    margin-left: 8px;
}

.badge-stopped {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.badge-running {
    background: rgba(34, 197, 94, 0.15);
    color: var(--accent-success);
    border: 1px solid rgba(34, 197, 94, 0.3);
    animation: pulse-border-green 1.5s infinite;
}

.badge-tripped {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* DIAGNOSTICS CONSOLE */
.console-panel {
    background: #090d16;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    height: 180px;
    overflow: hidden;
}

.console-header {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.console-header h3 {
    font-family: var(--font-heading);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.console-logs {
    padding: 12px 16px;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}

.console-line {
    border-bottom: 1px solid rgba(255, 255, 255, 0.01);
    padding-bottom: 4px;
    line-height: 1.4;
}

.system-line { color: var(--text-secondary); }
.info-line { color: var(--accent-primary); }
.success-line { color: var(--accent-success); }
.warning-line { color: var(--accent-warning); }
.danger-line { color: var(--color-tripped); font-weight: 500; }

/* SYMBOL PICKER POPOVER (MODAL) */
.symbol-picker {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.25s ease;
}

.symbol-picker.hidden {
    opacity: 0;
    pointer-events: none;
}

.picker-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.picker-content {
    background: #111827;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 520px;
    position: relative;
    z-index: 10;
    overflow: hidden;
    animation: scale-up 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.picker-header {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding: 14px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.picker-header h4 {
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s ease;
}
.close-btn:hover {
    color: #fff;
}

.picker-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 20px;
    max-height: 400px;
    overflow-y: auto;
}

.picker-option {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.picker-option:hover {
    background: rgba(14, 165, 233, 0.08);
    border-color: var(--accent-primary);
    box-shadow: var(--glow-blue);
    transform: translateY(-2px);
}

.picker-option .symbol-svg {
    height: 48px;
}

.picker-option-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.2;
    text-transform: uppercase;
}

.picker-option:hover .picker-option-label {
    color: #fff;
}

.picker-option-desc {
    font-size: 9px;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.3;
}

/* SUCCESS MODAL OVERLAY */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-card {
    background: #0f172a;
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 25px 60px -10px rgba(0, 0, 0, 0.8), 0 0 30px rgba(16, 185, 129, 0.1);
    width: 90%;
    max-width: 500px;
    padding: 36px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    animation: scale-up 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.success-check-icon {
    width: 64px;
    height: 64px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-success);
    border: 2px solid var(--accent-success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
    animation: scale-pulse 2s infinite ease-in-out;
}

.modal-card h2 {
    font-family: var(--font-heading);
    font-size: 26px;
    font-weight: 800;
    color: #fff;
}

.modal-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.educational-tip {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 16px;
    text-align: left;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.educational-tip strong {
    font-size: 12px;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.educational-tip p {
    font-size: 12.5px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.modal-buttons {
    margin-top: 8px;
    width: 100%;
}
.modal-buttons .btn {
    width: 100%;
}

/* KEYFRAMES & ANIMATIONS */
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

@keyframes scale-up {
    from { transform: scale(0.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

@keyframes scale-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.08); }
}

@keyframes shake-small {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-2px); }
    40%, 80% { transform: translateX(2px); }
}

@keyframes pulse-border-red {
    0%, 100% { border-color: rgba(239, 68, 68, 0.4); box-shadow: 0 0 10px rgba(239, 68, 68, 0.15); }
    50% { border-color: rgba(239, 68, 68, 0.8); box-shadow: 0 0 15px rgba(239, 68, 68, 0.35); }
}

@keyframes pulse-border-green {
    0%, 100% { border-color: rgba(34, 197, 94, 0.3); box-shadow: 0 0 10px rgba(34, 197, 94, 0.1); }
    50% { border-color: rgba(34, 197, 94, 0.7); box-shadow: 0 0 15px rgba(34, 197, 94, 0.25); }
}

/* Dynamic Animation States (applied to specific SVGs when active) */

/* Fan Motor Spinning */
.spinning .motor-fan {
    transform-origin: 50% 45%;
    animation: rotate-fan 1s infinite linear;
}
@keyframes rotate-fan {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Compressor Rumbling */
.rumbling .comp-body {
    animation: rumble-body 0.15s infinite linear;
}
@keyframes rumble-body {
    0% { transform: translate(0px, 0px); }
    25% { transform: translate(-0.8px, 0.8px); }
    50% { transform: translate(0.8px, -0.8px); }
    75% { transform: translate(-0.8px, -0.8px); }
    100% { transform: translate(0.8px, 0.8px); }
}

/* Flame flickering for Gas Valve */
.flaming .flame-path {
    fill: #f97316;
    stroke: #ef4444;
    animation: flame-flicker 0.25s infinite ease-in-out;
}
@keyframes flame-flicker {
    0%, 100% { transform: scale(1); opacity: 0.9; }
    50% { transform: scale(1.1) translateY(-1px); opacity: 1; }
}

/* Heater Element glowing orange/red */
.heating .heater-coils {
    stroke: #f97316 !important;
    filter: drop-shadow(0 0 3px #ef4444);
    animation: glow-pulse-heater 1s infinite ease-in-out;
}
@keyframes glow-pulse-heater {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

/* USER AUTHENTICATION & PROFILE SYSTEM */
.user-profile-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
}

.profile-avatar {
    font-size: 14px;
}

.profile-email {
    font-weight: 600;
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: #fff;
}

.auth-card {
    background: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 25px 60px -10px rgba(0, 0, 0, 0.8), 0 0 30px rgba(14, 165, 233, 0.15);
    width: 90%;
    max-width: 420px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    animation: scale-up 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 100;
}

.auth-brand {
    justify-content: center;
    border-bottom: none !important;
    padding-bottom: 0 !important;
}

.auth-tabs {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    padding: 4px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}

.auth-tab {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    padding: 8px 12px;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.auth-tab:hover {
    color: #fff;
}

.auth-tab.active {
    background: var(--accent-primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.3);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

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

.form-group label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    color: #fff;
    font-family: var(--font-body);
    font-size: 14px;
    padding: 10px 14px;
    border-radius: var(--border-radius-sm);
    outline: none;
    transition: all 0.2s ease;
}

.form-group input:focus {
    border-color: var(--accent-primary);
    box-shadow: var(--glow-blue);
    background: rgba(0, 0, 0, 0.4);
}

.pin-input-wrapper {
    position: relative;
    display: flex;
    width: 100%;
}

.pin-input-wrapper input {
    flex: 1;
    padding-right: 40px;
    letter-spacing: 6px;
}

.toggle-pin-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 16px;
    outline: none;
    padding: 4px;
    user-select: none;
}

.toggle-pin-btn:hover {
    color: #fff;
}

.input-hint {
    font-size: 11px;
    color: var(--text-muted);
}

.auth-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--color-tripped);
    padding: 10px 12px;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-mono);
    font-size: 11.5px;
    line-height: 1.45;
    max-height: 220px;
    overflow: auto;
    text-align: left;
    white-space: pre-wrap;
    word-break: break-word;
    animation: shake-small 0.4s ease;
}

.auth-submit {
    margin-top: 8px;
    width: 100%;
}

.hidden {
    display: none !important;
}