:root {
    --bg-color: #020617;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-success: #22c55e;
    --accent-danger: #ef4444;
    --accent-warning: #f59e0b;
    --border-color: rgba(51, 65, 85, 0.5);
    --header-bg: rgba(15, 23, 42, 0.9);
    --table-stripe: rgba(30, 41, 59, 0.4);
    --table-header: rgba(51, 65, 85, 0.8);
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --font-main: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
}

body.dark-theme {
    background: radial-gradient(circle at top left, #0f172a, #020617);
    backdrop-filter: blur(10px);
}


.light-theme {
    --bg-color: #f1f5f9;
    --panel-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --accent-primary: #2563eb;
    --accent-success: #16a34a;
    --accent-danger: #dc2626;
    --accent-warning: #d97706;
    --border-color: #e2e8f0;
    --header-bg: #ffffff;
    --table-stripe: #f8fafc;
    --table-header: #f1f5f9;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    overflow-x: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
.app-header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--card-shadow);
    z-index: 10;
}

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

.logo-icon {
    font-size: 1.5rem;
}

.logo h1 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
}

.logo .version {
    font-size: 0.75rem;
    background: var(--accent-primary);
    color: white;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    margin-left: 5px;
    vertical-align: middle;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 0.5rem;
}

/* Main Container */
.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    padding: 1rem 1.5rem 2rem 1.5rem;
    /* Increased bottom padding for the whole app */
    padding-left: 2rem;
    gap: 2rem;
}


/* Side Panels */
.side-panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--card-shadow);
    width: 250px;
    flex-shrink: 0;
    backdrop-filter: blur(10px);
    height: 100%;
}

.panel-header {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(to bottom, var(--table-header), transparent);
}

.panel-header h2 {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.red-header h2 {
    color: var(--accent-danger);
}

.blue-header h2 {
    color: var(--accent-primary);
}

/* Pipe Table */
.table-container {
    flex: 1;
    overflow-y: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

th {
    position: sticky;
    top: 0;
    background-color: var(--accent-primary);
    color: white;
    text-align: center;
    padding: 0;
    height: 50px;
    /* Fixed header height */
    font-weight: 600;
    z-index: 1;
}

td {
    padding: 0 0.5rem;
    height: 32px;
    /* Fixed row height */
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}


tr:nth-child(even) {
    background-color: var(--table-stripe);
}

tr:hover {
    background-color: rgba(59, 130, 246, 0.2);
}

.row-highlighted {
    background-color: var(--accent-primary) !important;
    color: white !important;
}

/* Main Content: Groups */
.main-content {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.groups-container {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    height: 100%;
    /* padding-bottom removed to keep UK aligned with sidebars */
}

.calc-group {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 380px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    position: relative;
    height: 100%;
}

.close-group {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 24px;
    height: 24px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 5;
    border-radius: 50%;
}

.close-group:hover {
    color: var(--accent-danger);
    background: rgba(239, 68, 68, 0.1);
    transform: rotate(90deg);
}

.group-config {
    padding: 1rem;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 0.5rem;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    /* height is now managed dynamically via JS to keep sync */
}

.sync-spacer {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding: 1rem;
    /* height is now managed dynamically via JS to keep sync */
}

.sync-spacer h2 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-danger);
    margin-bottom: 2rem;
}

.recommendation-tool-compact {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-top: auto;
    margin-bottom: 1rem;
}

.input-row-minimal {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.input-row-minimal input {
    width: 80px;
    padding: 4px 8px;
}

.input-row-minimal label {
    white-space: nowrap;
    color: var(--text-muted);
}

.group-recommendation {
    grid-column: 1 / -1;
    background-color: var(--bg-color);
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px dashed var(--accent-primary);
    margin-top: 0.5rem;
}

.rec-result-text-small {
    margin-top: 0.5rem;
    color: var(--accent-success);
    font-weight: 700;
    font-size: 0.9rem;
    text-align: center;
}



.group-config .title {
    grid-column: 1 / -1;
    color: var(--accent-danger);
    font-weight: 700;
    font-size: 1rem;
}

.fluid-settings {
    grid-column: 1 / -1;
    background-color: var(--bg-color);
    padding: 0.75rem;
    border-radius: 8px;
    margin-top: 0.5rem;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.fluid-settings.expanded {
    border-color: var(--border-color);
}

.fluid-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.fluid-header:hover span {
    color: var(--accent-primary) !important;
}

.chevron {
    font-size: 0.6rem;
    color: var(--text-muted);
    transition: transform 0.2s;
}

.fluid-presets {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.input-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* Group Results Table */
.group-results {
    flex: 1;
    overflow-y: auto;
}

/* Group Results Table header colors handled by generic th now */
.group-results table td {
    text-align: center;
    font-weight: 500;
}

/* Inputs & Buttons */
input,
select {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    font-size: 0.9rem;
    width: 100%;
    outline: none;
    transition: border-color 0.2s;
}

input:focus {
    border-color: var(--accent-primary);
}

input[readonly] {
    background-color: var(--table-header);
    cursor: default;
}

.btn {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary:hover {
    background: #1d4ed8;
}

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

.btn-success:hover {
    background: #15803d;
}

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

.btn-danger:hover {
    background: #b91c1c;
}

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

.btn-secondary:hover {
    background: var(--table-header);
}

.db-btn {
    padding: 2px 8px;
    font-size: 0.7rem;
    background: var(--border-color);
    color: var(--text-muted);
    border-radius: 4px;
    border: none;
    cursor: pointer;
}

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

.input-with-btn {
    display: flex;
    gap: 4px;
}

/* Special Case Styling */
.special-inputs {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-group label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 2px;
}

.spec-results {
    margin-top: 1rem;
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
}

.result-item.highlight {
    color: var(--accent-primary);
    font-size: 1.1rem;
    font-weight: 700;
}

.mt-10 {
    margin-top: 1rem;
}

.full-width {
    width: 100%;
}

/* Recommendation Result styles cleaned up */

.hint {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
    display: block;
    margin-top: 4px;
}

/* Theme Toggle */
.switch-label {
    width: 44px;
    height: 22px;
    background: #333;
    display: block;
    border-radius: 100px;
    position: relative;
    cursor: pointer;
}

.switch-label::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: #fff;
    border-radius: 90px;
    transition: 0.3s;
}

#theme-switch:checked+.switch-label {
    background: var(--accent-primary);
}

#theme-switch:checked+.switch-label::after {
    left: calc(100% - 2px);
    transform: translateX(-100%);
}

#theme-switch {
    display: none;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--panel-bg);
    margin: 5% auto;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    width: 400px;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.close-modal {
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.close-modal:hover {
    color: var(--accent-danger);
}

.db-list {
    max-height: 400px;
    overflow-y: auto;
    margin-top: 1rem;
}

.db-item {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
}

.db-item:hover {
    background-color: var(--accent-primary);
    color: white;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Mobile Warning */
@media (max-width: 1000px) {
    /* Basic responsive adjustments if needed, though this is a desktop-first tool */
}