/* Color Scheme */
:root {
    --dark-purple: rgb(38, 33, 95);
    --bright-purple: rgb(138, 43, 226);
    --light-purple: rgba(138, 43, 226, 0.1);
    --lighter-purple: rgba(138, 43, 226, 0.05);
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #ffffff;
    --background: #f8f9fa;
    --card-background: #ffffff;
    --border-color: #e0e0e0;
    --success: #28a745;
    --warning: #ffc107;
    --error: #dc3545;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--dark-purple), var(--bright-purple));
    color: var(--text-light);
    padding: 40px 20px;
    text-align: center;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Navigation */
.nav-back {
    margin-bottom: 20px;
}

.nav-back a {
    color: var(--dark-purple);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.nav-back a:hover {
    color: var(--bright-purple);
}

/* Landing Page Cards */
.landing-page {
    padding: 40px 0;
}

.calculator-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.calculator-card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(138, 43, 226, 0.2);
}

.card-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--dark-purple), var(--bright-purple));
    color: var(--text-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 20px;
}

.calculator-card h2 {
    color: var(--dark-purple);
    margin-bottom: 15px;
    font-size: 1.8rem;
}

.calculator-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
    margin: 20px 0 30px 0;
}

.feature-list li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    color: var(--text-secondary);
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--bright-purple);
    font-weight: bold;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--bright-purple);
    color: var(--text-light);
}

.btn-primary:hover {
    background: var(--dark-purple);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(138, 43, 226, 0.3);
}

.btn-secondary {
    background: var(--dark-purple);
    color: var(--text-light);
}

.btn-secondary:hover {
    background: var(--bright-purple);
}

/* Dashboard Tiles */
.dashboard-tiles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.tile {
    background: var(--card-background);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border-left: 4px solid var(--bright-purple);
}

.tile-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tile-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--dark-purple);
}

.tile-unit {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-left: 5px;
}

.tile.positive .tile-value {
    color: var(--success);
}

/* Calculator Layout */
.calculator-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 30px;
    margin-top: 30px;
}

/* Controls Panel */
.controls-panel {
    background: var(--card-background);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    height: fit-content;
    position: sticky;
    top: 20px;
}

.controls-panel h3 {
    color: var(--dark-purple);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.control-group {
    margin-bottom: 25px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.control-value {
    color: var(--bright-purple);
    font-weight: bold;
    float: right;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--light-purple);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bright-purple);
    cursor: pointer;
    transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--dark-purple);
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bright-purple);
    cursor: pointer;
    border: none;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* Results Panel */
.results-panel {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.chart-container {
    background: var(--card-background);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.chart-container h3 {
    color: var(--dark-purple);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.chart-wrapper {
    position: relative;
    height: 400px;
}

.chart-wrapper canvas {
    max-height: 100%;
}

/* Chatbot */
.chatbot-container {
    background: var(--card-background);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    height: 500px;
}

.chatbot-container h3 {
    color: var(--dark-purple);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 15px;
    padding: 15px;
    background: var(--lighter-purple);
    border-radius: 8px;
}

.chat-message {
    margin-bottom: 15px;
    padding: 12px 16px;
    border-radius: 8px;
    max-width: 85%;
}

.chat-message.user {
    background: var(--bright-purple);
    color: var(--text-light);
    margin-left: auto;
}

.chat-message.assistant {
    background: var(--card-background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.chat-message.system {
    background: var(--warning);
    color: var(--text-primary);
    max-width: 100%;
    text-align: center;
    font-size: 0.9rem;
}

.chat-input-container {
    display: flex;
    gap: 10px;
}

.chat-input-container input {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    outline: none;
}

.chat-input-container input:focus {
    border-color: var(--bright-purple);
}

.chat-input-container button {
    padding: 12px 24px;
}

.chat-input-container button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Markdown formatting within chat messages */
.chat-message h1, .chat-message h2, .chat-message h3,
.chat-message h4, .chat-message h5, .chat-message h6 {
    margin-top: 12px;
    margin-bottom: 8px;
    font-weight: 600;
}

.chat-message h1 { font-size: 1.4rem; }
.chat-message h2 { font-size: 1.3rem; }
.chat-message h3 { font-size: 1.2rem; }

.chat-message p {
    margin-bottom: 10px;
}

.chat-message p:last-child {
    margin-bottom: 0;
}

.chat-message ul, .chat-message ol {
    margin: 8px 0;
    padding-left: 24px;
}

.chat-message li {
    margin-bottom: 4px;
}

.chat-message code {
    background: rgba(0, 0, 0, 0.08);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
}

.chat-message pre {
    background: rgba(0, 0, 0, 0.05);
    padding: 12px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 10px 0;
}

.chat-message pre code {
    background: transparent;
    padding: 0;
}

.chat-message strong {
    font-weight: 600;
}

.chat-message em {
    font-style: italic;
}

.chat-message a {
    color: var(--bright-purple);
    text-decoration: underline;
}

.chat-message a:hover {
    color: var(--dark-purple);
}

.chat-message blockquote {
    border-left: 3px solid var(--bright-purple);
    padding-left: 12px;
    margin: 10px 0;
    color: rgba(0, 0, 0, 0.7);
}

.chat-message hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 15px 0;
}

/* Special styling for user messages with dark background */
.chat-message.user code {
    background: rgba(255, 255, 255, 0.2);
}

.chat-message.user pre {
    background: rgba(255, 255, 255, 0.15);
}

.chat-message.user a {
    color: white;
    text-decoration: underline;
}

.chat-message.user blockquote {
    border-left-color: white;
    color: rgba(255, 255, 255, 0.9);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    margin-top: 50px;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .calculator-layout {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        position: relative;
        top: 0;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .calculator-cards {
        grid-template-columns: 1fr;
    }

    .dashboard-tiles {
        grid-template-columns: 1fr;
    }

    .tile-value {
        font-size: 1.5rem;
    }
}

/* Loading State */
.loading {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}