:root {
    --bg-dark: #111111;
    --bg-sidebar: #0a0a0a;
    --bg-card: #1e1e1e;
    --bg-input: #2a2a2a;
    --border-color: #333;
    --primary: #3b82f6;
    --text-main: #eeeeee;
    --text-muted: #888888;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --sidebar-width: 260px;
    --sidebar-width-collapsed: 60px;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    overflow: hidden;
    /* App-like feel */
}

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

/* Buttons */
.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    /* Pill shape for primary actions */
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary:hover {
    background: #2563eb;
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: #555;
}

.btn-xs {
    padding: 4px 10px;
    font-size: 0.75rem;
    border-radius: 4px;
    background: #333;
    border: none;
    color: white;
    cursor: pointer;
}

/* Icon Buttons (Material Style) */
.btn-icon-group {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.btn-icon.edit:hover {
    color: var(--primary);
    background: rgba(59, 130, 246, 0.1);
}

.btn-icon.delete:hover {
    color: var(--accent-red);
    background: rgba(239, 68, 68, 0.1);
}

.icon-svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* Auth */
#auth-container {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #222 0%, #000 100%);
}

.auth-card {
    text-align: center;
    background: var(--bg-card);
    padding: 3rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

/* Dashboard Layout */
#dashboard-layout {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease;
}

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

.sidebar-header {
    height: 60px;
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    font-weight: 700;
    font-size: 1.2rem;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
    overflow: hidden;
}

.sidebar.collapsed .sidebar-header {
    padding: 0 1rem;
}

.logo-icon {
    color: var(--primary);
    margin-right: 0.75rem;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
}

.nav-section {
    margin-bottom: 2rem;
}

.nav-label {
    display: block;
    padding: 0.5rem 1.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.sidebar.collapsed .nav-label {
    display: none;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: all 0.2s;
    white-space: nowrap;
}

.nav-item:hover,
.nav-item.active {
    color: white;
    background: rgba(255, 255, 255, 0.05);
    border-right: 3px solid var(--primary);
}

.nav-item .icon {
    margin-right: 1rem;
    min-width: 20px;
    text-align: center;
}

.nav-item .text {
    opacity: 1;
    transition: opacity 0.2s;
}

.sidebar.collapsed .nav-item .text {
    opacity: 0;
    width: 0;
}

/* Main Wrapper */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    background: var(--bg-dark);
}

/* Top Header */
.top-header {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border-color);
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.2rem;
    cursor: pointer;
}

/* Content Area */
#content-area {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

/* Sections & Typography */
.section-title {
    font-size: 1rem;
    margin: 2rem 0 1rem 0;
    display: flex;
    align-items: center;
    color: var(--text-main);
}

.dot {
    height: 8px;
    width: 8px;
    border-radius: 50%;
    margin-right: 10px;
}

.dot.blue {
    background: var(--primary);
}

.dot.green {
    background: var(--accent-green);
}

.dot.purple {
    background: #8b5cf6;
}

.dot.orange {
    background: #f97316;
}

/* KPI Cards */
.kpi-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.kpi-card {
    background: rgba(30, 30, 30, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(800px circle at var(--mouse-x, 0) var(--mouse-y, 0), rgba(255, 255, 255, 0.06), transparent 40%);
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
    z-index: 1;
}

.kpi-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.15);
}

.kpi-card:hover::before {
    opacity: 1;
}

/* Color Glows */
.kpi-card.blue:hover {
    border-color: rgba(59, 130, 246, 0.5);
    box-shadow: 0 10px 40px -10px rgba(59, 130, 246, 0.2), inset 0 0 20px rgba(59, 130, 246, 0.05);
}

.kpi-card.green:hover {
    border-color: rgba(16, 185, 129, 0.5);
    box-shadow: 0 10px 40px -10px rgba(16, 185, 129, 0.2), inset 0 0 20px rgba(16, 185, 129, 0.05);
}

.kpi-card.purple:hover {
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: 0 10px 40px -10px rgba(139, 92, 246, 0.2), inset 0 0 20px rgba(139, 92, 246, 0.05);
}

.kpi-card.orange:hover {
    border-color: rgba(249, 115, 22, 0.5);
    box-shadow: 0 10px 40px -10px rgba(249, 115, 22, 0.2), inset 0 0 20px rgba(249, 115, 22, 0.05);
}

.kpi-card>* {
    position: relative;
    z-index: 2;
}

.kpi-header {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.kpi-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.kpi-trend {
    font-size: 0.875rem;
    font-weight: 500;
}

.kpi-trend.positive {
    color: var(--accent-green);
}

.kpi-trend.negative {
    color: var(--accent-red);
}

/* Config / Calculator Styles */
.config-container {
    max-width: 1200px;
    margin: 0 auto;
    color: var(--text-main);
}

.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 900px) {
    .split-layout {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: white;
    padding: 0.75rem;
    border-radius: 6px;
    box-sizing: border-box;
}

input:focus {
    outline: none;
    border-color: var(--primary);
}

.results-panel {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    justify-content: space-around;
    background: rgba(59, 130, 246, 0.1);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.metric-mini span {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.metric-mini strong {
    font-size: 1.2rem;
    color: var(--primary);
}

/* Table */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th,
td {
    text-align: left;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

th {
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
}

.edit-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
}

.edit-btn:hover {
    color: white;
    border-color: white;
}

/* LLM Chat */
.llm-chat {
    position: fixed;
    bottom: 0;
    right: 2rem;
    width: 350px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-bottom: none;
    border-radius: 12px 12px 0 0;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    z-index: 100;
}

.llm-chat.collapsed {
    transform: translateY(calc(100% - 40px));
}

.chat-header {
    height: 40px;
    background: linear-gradient(90deg, #2b2b2b, var(--bg-card));
    padding: 0 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
}

.chat-body {
    height: 400px;
    display: flex;
    flex-direction: column;
}

.messages-area {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    font-size: 0.9rem;
}

.msg {
    margin-bottom: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    max-width: 85%;
}

.msg.bot {
    background: #2a2a2a;
    align-self: flex-start;
}

.msg.user {
    background: var(--primary);
    align-self: flex-end;
    margin-left: auto;
}

.chat-input-area {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

#chat-input {
    padding: 0.5rem;
    border-radius: 20px;
}

#send-chat {
    background: var(--primary);
    border: none;
    color: white;
    padding: 0 1rem;
    border-radius: 20px;
    cursor: pointer;
}