/* --- WinUI 3 (Windows 11) Design System Variables --- */
:root {
    /* Fluent Typography */
    --font-family: "Segoe UI Variable Text", "Segoe UI Variable", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
    --font-display: "Segoe UI Variable Display", "Segoe UI Variable", "Segoe UI", -apple-system, sans-serif;

    /* Light Theme Colors (Default) */
    --layer-bg: #F3F3F3;
    /* Solid fallback for Mica */
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(0, 0, 0, 0.06);
    --text-primary: rgba(0, 0, 0, 0.895);
    --text-secondary: rgba(0, 0, 0, 0.605);
    --text-tertiary: rgba(0, 0, 0, 0.45);

    --accent-default: #005FB8;
    --accent-secondary: #0050A0;
    --accent-tertiary: #004285;

    --control-fill: rgba(255, 255, 255, 0.7);
    --control-stroke: rgba(0, 0, 0, 0.06);
    --control-stroke-bottom: rgba(0, 0, 0, 0.16);
    --control-hover: rgba(249, 249, 249, 0.5);
    --control-active: rgba(249, 249, 249, 0.3);

    --primary-btn-fg: #FFFFFF;
    --primary-btn-hover: rgba(255, 255, 255, 0.1);

    --track-fill: rgba(0, 0, 0, 0.2);
    --orb-bg-empty: rgba(255, 255, 255, 0.5);
    --orb-bg-filled: rgba(0, 95, 184, 0.06);

    --easing: cubic-bezier(0.1, 0.9, 0.2, 1);
    --duration-fast: 167ms;

    --dropdown-bg: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] {
    /* Dark Theme Colors */
    --layer-bg: #202020;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.78);
    --text-tertiary: rgba(255, 255, 255, 0.53);

    --accent-default: #60CDFF;
    --accent-secondary: #58BFED;
    --accent-tertiary: #50B0D9;

    --control-fill: rgba(255, 255, 255, 0.06);
    --control-stroke: rgba(255, 255, 255, 0.09);
    --control-stroke-bottom: rgba(255, 255, 255, 0.09);
    --control-hover: rgba(255, 255, 255, 0.08);
    --control-active: rgba(255, 255, 255, 0.03);

    --primary-btn-fg: #000000;
    --primary-btn-hover: rgba(0, 0, 0, 0.1);

    --track-fill: rgba(255, 255, 255, 0.2);
    --orb-bg-empty: rgba(0, 0, 0, 0.2);
    --orb-bg-filled: rgba(96, 205, 255, 0.1);

    --dropdown-bg: rgba(32, 32, 32, 0.95);
}

/* --- Base Resets & Layout --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--layer-bg);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--duration-fast), color var(--duration-fast);
}

/* --- WinUI Typography --- */
h1 {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 600;
    line-height: 36px;
}

h2 {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    line-height: 28px;
    margin-bottom: 16px;
}

.body-text {
    font-size: 14px;
    line-height: 20px;
    color: var(--text-secondary);
}

.caption-text {
    font-size: 12px;
    line-height: 16px;
    color: var(--text-tertiary);
    margin-top: 16px;
}

.accent-text {
    color: var(--accent-default);
    font-weight: 600;
}

/* --- App Header (Title Bar style) --- */
.fluent-header {
    padding: 32px 32px 12px 32px;
}

.header-content {
    max-width: 1920px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    padding-bottom: 16px;
}

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

.app-icon {
    width: 24px;
    height: 24px;
    color: var(--accent-default);
}

/* --- Main Layout --- */
.app-content {
    max-width: 1920px;
    width: 100%;
    margin: 0 auto;
    padding: 0 32px 32px 32px;
    display: grid;
    /* 3-Column setup! Utilizing max-screen width */
    grid-template-columns: 340px 1fr auto;
    gap: 24px;
    flex-grow: 1;
}

/* --- Layout Responsiveness (Desktop to Mobile) --- */
@media (max-width: 1400px) {
    .app-content {
        grid-template-columns: 340px 1fr;
    }

    .panel-right {
        grid-column: 1 / -1;
    }

    .atom-card {
        min-height: 350px;
    }
}

@media (max-width: 950px) {
    .app-content {
        grid-template-columns: 1fr;
    }

    .fluent-header {
        padding: 24px 24px 8px 24px;
    }

    .app-content {
        padding: 0 24px 24px 24px;
    }
}

.panel-left,
.panel-middle,
.panel-right {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.panel-middle {
    min-width: 250px;
}

/* --- Fluent Cards (Layering) --- */
.fluent-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
    backdrop-filter: blur(10px);
    transition: background var(--duration-fast) var(--easing), border var(--duration-fast) var(--easing);
}

.grid-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100%;
    overflow-x: auto;
}

/* --- Bohr Model Visualizer --- */
.atom-card {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    height: 100%;
    min-height: 400px;
}

#canvas-container {
    flex-grow: 1;
    width: 100%;
    height: 100%;
    min-height: 300px;
    position: relative;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

/* --- Element Info --- */
.element-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.element-symbol {
    width: 64px;
    height: 64px;
    background: var(--accent-default);
    color: var(--primary-btn-fg);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 600;
    font-family: var(--font-display);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.element-name {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.element-atomic {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* --- Controls: Fluent Slider --- */
.slider-container {
    margin-bottom: 24px;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.fluent-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 24px;
    background: transparent;
    outline: none;
    cursor: pointer;
    --slider-fill: 0%;
}

.fluent-slider::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    background: linear-gradient(to right, var(--accent-default) var(--slider-fill), var(--track-fill) var(--slider-fill));
    border-radius: 2px;
}

.fluent-slider::-moz-range-track {
    width: 100%;
    height: 4px;
    background: var(--track-fill);
    border-radius: 2px;
}

.fluent-slider::-moz-range-progress {
    background: var(--accent-default);
    height: 4px;
    border-radius: 2px;
}

.fluent-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: var(--accent-default);
    border: 4px solid rgb(55, 55, 55);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    margin-top: -8px;
    transition: transform var(--duration-fast) var(--easing), border-width 0.1s;
}

.fluent-slider:hover::-webkit-slider-thumb {
    transform: scale(1.1);
}

.fluent-slider:active::-webkit-slider-thumb {
    transform: scale(0.9);
    border-width: 6px;
}

/* --- Controls: Fluent Buttons --- */
.button-group {
    display: flex;
    gap: 8px;
}

.fluent-btn {
    font-family: var(--font-family);
    font-size: 14px;
    font-weight: 500;
    height: 32px;
    padding: 0 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--duration-fast) var(--easing);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.fluent-btn.standard {
    background: var(--control-fill);
    color: var(--text-primary);
    border: 1px solid var(--control-stroke);
    border-bottom-color: var(--control-stroke-bottom);
}

.fluent-btn.standard:hover {
    background: var(--control-hover);
}

.fluent-btn.standard:active {
    background: var(--control-active);
    color: var(--text-secondary);
    border-bottom-color: var(--control-stroke);
}

.fluent-btn.primary {
    background: var(--accent-default);
    color: var(--primary-btn-fg);
    border: 1px solid transparent;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15);
    flex-grow: 1;
}

.fluent-btn.primary:hover {
    background: var(--accent-secondary);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.fluent-btn.primary:active {
    background: var(--accent-tertiary);
    color: rgba(255, 255, 255, 0.7);
    box-shadow: none;
}

/* --- Controls: Fluent Toggle Switch --- */
.fluent-toggle {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    user-select: none;
    outline: none;
}

.toggle-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.toggle-switch {
    width: 40px;
    height: 20px;
    border-radius: 10px;
    background: var(--control-fill);
    border: 1px solid var(--text-secondary);
    position: relative;
    transition: background var(--duration-fast), border var(--duration-fast);
}

.toggle-thumb {
    width: 12px;
    height: 12px;
    background: var(--text-secondary);
    border-radius: 50%;
    position: absolute;
    top: 3px;
    left: 3px;
    transition: all var(--duration-fast) var(--easing);
}

.fluent-toggle:hover .toggle-thumb {
    width: 14px;
    height: 14px;
    top: 2px;
    left: 2px;
    background: var(--text-primary);
}

.fluent-toggle[aria-checked="true"] .toggle-switch {
    background: var(--accent-default);
    border-color: var(--accent-default);
}

.fluent-toggle[aria-checked="true"] .toggle-thumb {
    background: var(--primary-btn-fg);
    left: calc(100% - 15px);
}

.fluent-toggle[aria-checked="true"]:hover .toggle-thumb {
    left: calc(100% - 16px);
}

/* --- Electron Configuration Tags --- */
.config-text {
    font-family: var(--font-family);
    font-size: 14px;
    line-height: 1.5;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.placeholder-text {
    color: var(--text-tertiary);
    font-style: italic;
}

.config-tag {
    background: var(--control-fill);
    border: 1px solid var(--control-stroke);
    color: var(--text-primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
    animation: fluentFadeIn 0.2s var(--easing) forwards;
}

.config-tag.active {
    background: var(--accent-default);
    color: var(--primary-btn-fg);
    border-color: transparent;
}

/* --- Grid Diagram --- */
.diagram {
    display: grid;
    grid-template-columns: 40px repeat(4, 72px);
    grid-template-rows: 30px repeat(7, 72px);
    gap: 8px;
    position: relative;
}

@media (min-width: 1100px) {
    .diagram {
        grid-template-columns: 50px repeat(4, 80px);
        grid-template-rows: 40px repeat(7, 80px);
        gap: 12px;
    }
}

.grid-header {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
}

.row-header {
    justify-content: flex-end;
    padding-right: 12px;
}

/* Orbital Items (WinUI Grid Items) */
.orbital {
    background: var(--orb-bg-empty);
    border: 1px solid transparent;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.1, 0.9, 0.2, 1);
}

.order-badge {
    position: absolute;
    top: 4px;
    left: 6px;
    font-size: 10px;
    color: var(--text-tertiary);
    font-weight: 600;
}

.orb-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 4px;
}

.orb-count {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* Fluent Inner Progress Bar */
.progress-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: transparent;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background-color: var(--accent-default);
    border-radius: 0 4px 0 0;
    transition: width var(--duration-fast) ease-out;
}

/* Orbital States */
.orbital.filling {
    border-color: var(--accent-default);
    background: var(--orb-bg-empty);
    transform: scale(1.02);
}

.orbital.filled {
    border-color: transparent;
    background: var(--orb-bg-filled);
}

.orbital.filled .orb-name {
    color: var(--accent-default);
}

.orbital.filled .progress-bar {
    border-radius: 0;
}

/* Animations */
@keyframes fluentFadeIn {
    0% {
        opacity: 0;
        transform: translateY(4px);
    }

    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Controls: Manual Input Field --- */
.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.fluent-input {
    width: 60px;
    height: 32px;
    padding: 4px 8px;
    font-family: var(--font-family);
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    border: 1px solid var(--control-stroke);
    border-bottom-color: var(--control-stroke-bottom);
    background: var(--control-fill);
    color: var(--text-primary);
    outline: none;
    transition: all var(--duration-fast) var(--easing);
    text-align: center;
}

.fluent-input:focus {
    border-bottom-color: var(--accent-default);
    border-bottom-width: 2px;
    padding-bottom: 3px;
}

.fluent-input::-webkit-outer-spin-button,
.fluent-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.fluent-input[type=number] {
    -moz-appearance: textfield;
}

/* --- Element Search Bar --- */
.card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
    position: relative;
    z-index: 10;
}

.card-header-row .card-title {
    margin-bottom: 0;
}

.search-box {
    flex-grow: 1;
    max-width: 200px;
    margin-left: auto;
    position: relative;
    z-index: 101;
}

.search-box .fluent-input {
    width: 100%;
    text-align: left;
}

.fluent-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--dropdown-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    max-height: 150px;
    overflow-y: auto;
    z-index: 999;
    list-style: none;
    padding: 4px;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.fluent-dropdown.hidden {
    display: none;
}

.dropdown-item {
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.dropdown-item:hover {
    background: var(--control-hover);
}

.dropdown-item:active {
    background: var(--control-active);
}

.dropdown-symbol {
    font-weight: 600;
    color: var(--accent-default);
    width: 24px;
}

.dropdown-name {
    color: var(--text-primary);
}

.fluent-dropdown::-webkit-scrollbar {
    width: 4px;
}

.fluent-dropdown::-webkit-scrollbar-track {
    background: transparent;
}

.fluent-dropdown::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 4px;
}

.fluent-checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
    margin: 10px 0;
}

/* Hide the actual input but keep it functional */
.fluent-checkbox-input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

/* The custom box */
.fluent-checkbox-box {
    height: 20px;
    width: 20px;
    background: var(--control-fill);
    border: 1px solid var(--control-stroke);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s var(--easing);
    margin-right: 10px;
}

/* The Checkmark (SVG) */
.fluent-checkmark {
    width: 12px;
    height: 12px;
    color: transparent;
    /* Hide by default */
    transition: color 0.2s ease;
}

/* Checkbox Hover State */
.fluent-checkbox-container:hover .fluent-checkbox-box {
    background: var(--control-hover);
    border-color: var(--text-secondary);
}

/* CHECKED STATE: Using your color-mix logic style */
.fluent-checkbox-input:checked+.fluent-checkbox-label .fluent-checkbox-box {
    background: var(--accent-default);
    border-color: var(--accent-default);
}

.fluent-checkbox-input:checked+.fluent-checkbox-label .fluent-checkmark {
    color: var(--primary-btn-fg);
    /* White check on blue box */
}

/* Focus state for accessibility */
.fluent-checkbox-input:focus-visible+.fluent-checkbox-label .fluent-checkbox-box {
    outline: 2px solid var(--accent-default);
    outline-offset: 2px;
}

.checkbox-text {
    font-size: 14px;
    color: var(--text-primary);
}


::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--text-tertiary);

    border: 3px solid transparent;
    background-clip: content-box;

    border-radius: 10px;
}


::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
    border: 3px solid transparent;
    background-clip: content-box;
}


* {
    scrollbar-width: thin;
    scrollbar-color: var(--text-tertiary) transparent;
}

@media (max-width: 480px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .header-titles h1 {
        font-size: 22px;
    }

    .fluent-header {
        padding: 16px 16px 8px 16px;
    }

    .app-content {
        padding: 0 16px 16px 16px;
        gap: 16px;
    }

    .fluent-card {
        padding: 16px;
    }

    .element-symbol {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }

    .card-header-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .search-box {
        max-width: 100%;
        width: 100%;
        margin-left: 0;
    }

    .element-name {
        font-size: 18px;
    }

    .slider-header {
        gap: 8px;
    }

    .atom-card {
        min-height: 300px;
    }

    #canvas-container {
        min-height: 250px;
    }

    .diagram {
        grid-template-columns: 24px repeat(4, 60px);
        grid-template-rows: 24px repeat(7, 60px);
        gap: 4px;
    }

    .grid-header {
        font-size: 12px;
    }

    .orb-name {
        font-size: 14px;
    }

    .orb-count {
        font-size: 10px;
    }

    .order-badge {
        font-size: 9px;
        top: 2px;
        left: 4px;
    }
}