/* ============================================================
   YieldLens — Commercial Lending Portfolio Yield Analysis
   Dark theme with green/teal accents
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2333;
    --bg-card-hover: #222d3f;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent-primary: #2dd4a8;
    --accent-secondary: #0ea5e9;
    --accent-gradient: linear-gradient(135deg, #2dd4a8, #0ea5e9);
    --accent-gradient-hover: linear-gradient(135deg, #34eabc, #38bdf8);
    --negative: #f87171;
    --positive: #34d399;
    --warning: #fbbf24;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --nav-height: 64px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ---------- Utility ---------- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.negative { color: var(--negative) !important; }
.positive { color: var(--positive) !important; }

/* ---------- Navbar ---------- */
.navbar {
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--nav-height);
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background 0.3s;
}
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
    height: 100%;
}
.nav-logo {
    display: flex; align-items: center; gap: 10px;
    font-weight: 700; font-size: 1.25rem;
    color: var(--text-primary); text-decoration: none;
}
.nav-logo i { color: var(--accent-primary); font-size: 1.4rem; }
.nav-links {
    display: flex; list-style: none; gap: 8px;
}
.nav-links a {
    color: var(--text-secondary); text-decoration: none;
    padding: 8px 14px; border-radius: var(--radius-sm);
    font-size: 0.875rem; font-weight: 500;
    transition: all 0.2s;
}
.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
    background: rgba(45, 212, 168, 0.1);
}
.nav-toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-toggle span {
    display: block; width: 24px; height: 2px;
    background: var(--text-primary); transition: 0.3s;
}

/* ---------- Hero ---------- */
.hero {
    position: relative; padding: calc(var(--nav-height) + 80px) 0 60px;
    text-align: center; overflow: hidden;
}
.hero-bg-pattern {
    position: absolute; inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(45, 212, 168, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.06) 0%, transparent 50%);
}
.hero-badge {
    display: inline-block;
    padding: 6px 16px; margin-bottom: 24px;
    background: rgba(45, 212, 168, 0.1);
    border: 1px solid rgba(45, 212, 168, 0.3);
    border-radius: 100px;
    font-size: 0.8rem; font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.5px; text-transform: uppercase;
}
.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800; line-height: 1.15;
    margin-bottom: 20px;
}
.hero-subtitle {
    max-width: 720px; margin: 0 auto 28px;
    font-size: 1.1rem; color: var(--text-secondary);
    line-height: 1.7;
}
.hero-tags { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 32px; }
.tag {
    padding: 5px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.8rem; font-weight: 500;
    color: var(--text-secondary);
}
.hero-cta { display: flex; gap: 16px; justify-content: center; margin-bottom: 60px; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px; border-radius: var(--radius-sm);
    font-size: 0.95rem; font-weight: 600;
    text-decoration: none; cursor: pointer;
    transition: all 0.25s; border: none;
}
.btn-primary {
    background: var(--accent-gradient);
    color: #0d1117;
}
.btn-primary:hover {
    background: var(--accent-gradient-hover);
    box-shadow: 0 4px 20px rgba(45, 212, 168, 0.3);
    transform: translateY(-1px);
}
.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}
.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Metric Cards */
.metric-cards {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 20px; margin-bottom: 60px;
}
.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    transition: all 0.3s;
    opacity: 0; transform: translateY(20px);
}
.metric-card.visible { opacity: 1; transform: translateY(0); }
.metric-card:hover {
    border-color: rgba(45, 212, 168, 0.3);
    box-shadow: 0 0 24px rgba(45, 212, 168, 0.08);
}
.metric-icon {
    font-size: 1.5rem; margin-bottom: 12px;
    color: var(--accent-primary);
}
.metric-value {
    font-size: 2.2rem; font-weight: 800;
    font-family: var(--font-mono);
    color: var(--text-primary);
    margin-bottom: 6px;
}
.metric-value small { font-size: 1rem; font-weight: 600; }
.metric-label {
    font-size: 0.85rem; color: var(--text-secondary);
    font-weight: 500;
}

/* Two Column */
.two-col-section {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.col-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
}
.col-card h3 {
    font-size: 1.15rem; margin-bottom: 12px;
    display: flex; align-items: center; gap: 10px;
}
.col-card h3 i { color: var(--accent-primary); }
.col-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }
.col-card em { color: var(--accent-primary); font-style: italic; }

/* ---------- Sections ---------- */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-secondary); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-label {
    display: inline-block; padding: 4px 14px;
    background: rgba(45, 212, 168, 0.1);
    border: 1px solid rgba(45, 212, 168, 0.2);
    border-radius: 100px;
    font-size: 0.75rem; font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase; letter-spacing: 0.5px;
    margin-bottom: 16px;
}
.section-header h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 800; margin-bottom: 12px;
}
.section-header p {
    color: var(--text-secondary); font-size: 1.05rem;
    max-width: 600px; margin: 0 auto;
}

/* ---------- Discovery ---------- */
.discovery-grid {
    display: grid; grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}
.discovery-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: all 0.3s;
}
.discovery-card:hover {
    border-color: rgba(45, 212, 168, 0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.discovery-icon {
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(45, 212, 168, 0.1);
    border-radius: var(--radius-sm);
    color: var(--accent-primary);
    font-size: 1.1rem; margin-bottom: 16px;
}
.discovery-card h4 { font-size: 1.05rem; margin-bottom: 12px; }
.discovery-card ul { list-style: none; }
.discovery-card li {
    position: relative; padding-left: 18px;
    color: var(--text-secondary); font-size: 0.9rem;
    margin-bottom: 8px; line-height: 1.5;
}
.discovery-card li::before {
    content: ''; position: absolute; left: 0; top: 9px;
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--accent-primary);
}

/* ---------- Approach Steps ---------- */
.approach-steps { max-width: 700px; margin: 0 auto; }
.approach-step {
    display: flex; gap: 24px; align-items: flex-start;
    margin-bottom: 32px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.3s;
}
.approach-step:hover {
    border-color: rgba(45, 212, 168, 0.3);
}
.step-number {
    font-size: 2rem; font-weight: 800;
    font-family: var(--font-mono);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 50px;
}
.step-content h4 { font-size: 1.05rem; margin-bottom: 6px; }
.step-content p { color: var(--text-secondary); font-size: 0.9rem; }

/* ---------- Chart Panels ---------- */
.chart-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 32px;
    overflow: hidden;
}
.chart-header {
    padding: 24px 28px 0;
}
.chart-header h3 {
    font-size: 1.1rem; margin-bottom: 6px;
    display: flex; align-items: center; gap: 10px;
}
.chart-header h3 i { color: var(--accent-primary); font-size: 1rem; }
.chart-header p { color: var(--text-secondary); font-size: 0.875rem; }
.chart-container {
    width: 100%; height: 420px;
    padding: 8px 16px 8px;
}
.chart-insight {
    display: flex; gap: 12px; align-items: flex-start;
    padding: 16px 28px 20px;
    border-top: 1px solid var(--border-color);
    background: rgba(45, 212, 168, 0.03);
}
.chart-insight i {
    color: var(--accent-primary); margin-top: 2px;
    flex-shrink: 0;
}
.chart-insight span { color: var(--text-secondary); font-size: 0.875rem; line-height: 1.5; }

/* ---------- Executive Summary ---------- */
.exec-table-wrapper {
    overflow-x: auto; margin-bottom: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}
.exec-table {
    width: 100%; border-collapse: collapse;
    font-size: 0.95rem;
}
.exec-table th {
    background: var(--bg-card);
    padding: 14px 20px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-color);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.exec-table td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}
.exec-table tr:last-child td {
    font-weight: 700;
    border-bottom: none;
    background: rgba(45, 212, 168, 0.05);
}
.exec-table tr:hover td {
    background: rgba(45, 212, 168, 0.03);
}

.findings-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.findings-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
}
.findings-section h3 {
    font-size: 1.05rem; margin-bottom: 18px;
    display: flex; align-items: center; gap: 10px;
}
.findings-section h3 i { color: var(--accent-primary); }
.finding-item, .recommendation-item {
    display: flex; gap: 12px; align-items: flex-start;
    margin-bottom: 14px;
}
.finding-item::before {
    content: '';
    flex-shrink: 0;
    width: 8px; height: 8px;
    margin-top: 7px;
    border-radius: 50%;
    background: var(--accent-primary);
}
.recommendation-item {
    padding: 12px 16px;
    background: rgba(45, 212, 168, 0.05);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-primary);
}
.finding-item span, .recommendation-item span {
    color: var(--text-secondary); font-size: 0.9rem; line-height: 1.5;
}

/* ---------- Explorer ---------- */
.explorer-controls {
    display: flex; gap: 16px; flex-wrap: wrap;
    margin-bottom: 24px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}
.control-group { flex: 1; min-width: 160px; }
.control-group label {
    display: block;
    font-size: 0.8rem; font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}
.control-group select {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.9rem;
    cursor: pointer;
}
.control-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.explorer-metrics {
    display: grid; grid-template-columns: repeat(5, 1fr);
    gap: 16px; margin-bottom: 24px;
}
.explorer-metric {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}
.explorer-metric-label {
    font-size: 0.75rem; font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}
.explorer-metric-value {
    font-size: 1.4rem; font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-primary);
}
.explorer-charts-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 20px; margin-bottom: 32px;
}
.chart-container-sm {
    height: 320px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
}

/* What-If */
.whatif-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
}
.whatif-panel h3 {
    font-size: 1.1rem; margin-bottom: 8px;
    display: flex; align-items: center; gap: 10px;
}
.whatif-panel h3 i { color: var(--accent-primary); }
.whatif-panel > p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 24px; }
.whatif-controls {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px; margin-bottom: 24px;
}
.whatif-slider label {
    display: block;
    font-size: 0.85rem; font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.whatif-slider label span {
    color: var(--accent-primary);
    font-weight: 700;
    font-family: var(--font-mono);
}
.whatif-slider input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
}
.whatif-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(45, 212, 168, 0.4);
}
.whatif-result {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding: 20px;
    background: rgba(45, 212, 168, 0.05);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(45, 212, 168, 0.15);
}
.whatif-metric { text-align: center; }
.whatif-metric-label {
    font-size: 0.75rem; font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}
.whatif-metric-value {
    font-size: 1.5rem; font-weight: 700;
    font-family: var(--font-mono);
}

/* ---------- Limitations ---------- */
.limitations-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.limitation-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: all 0.3s;
}
.limitation-card:hover {
    border-color: rgba(45, 212, 168, 0.3);
}
.limitation-icon {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(248, 113, 113, 0.1);
    border-radius: var(--radius-sm);
    color: var(--warning);
    font-size: 1rem; margin-bottom: 14px;
}
.limitation-card h4 { font-size: 0.95rem; margin-bottom: 8px; }
.limitation-card p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.6; }

/* ---------- Tech ---------- */
.tech-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.tech-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
}
.tech-card h4 {
    font-size: 1.05rem; margin-bottom: 10px;
    display: flex; align-items: center; gap: 10px;
}
.tech-card h4 i { color: var(--accent-primary); }
.tech-card p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 16px; }
.tech-badges { display: flex; gap: 8px; flex-wrap: wrap; }
.badge {
    padding: 4px 12px;
    background: rgba(45, 212, 168, 0.1);
    border: 1px solid rgba(45, 212, 168, 0.2);
    border-radius: 100px;
    font-size: 0.75rem; font-weight: 600;
    color: var(--accent-primary);
}

/* ---------- About ---------- */
.about-content { max-width: 700px; margin: 0 auto; text-align: center; }
.about-narrative {
    color: var(--text-secondary);
    font-size: 1.05rem; line-height: 1.8;
    margin-bottom: 20px;
}
.about-links {
    display: flex; gap: 16px; justify-content: center;
    margin-bottom: 32px;
}
.disclaimer {
    display: flex; gap: 10px; align-items: flex-start;
    text-align: left;
    padding: 16px 20px;
    background: rgba(251, 191, 36, 0.05);
    border: 1px solid rgba(251, 191, 36, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.85rem; color: var(--text-secondary);
    line-height: 1.6;
}
.disclaimer i { color: var(--warning); margin-top: 2px; flex-shrink: 0; }

/* ---------- Chat Widget ---------- */
.chat-widget { position: fixed; bottom: 24px; right: 24px; z-index: 999; }
.chat-toggle {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: none;
    color: #0d1117;
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s;
    display: flex; align-items: center; justify-content: center;
}
.chat-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 32px rgba(45, 212, 168, 0.4);
}
.chat-panel {
    display: none; position: absolute;
    bottom: 70px; right: 0;
    width: 380px; max-height: 520px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    overflow: hidden;
}
.chat-panel.open { display: flex; }
.chat-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}
.chat-header h4 {
    font-size: 0.9rem;
    display: flex; align-items: center; gap: 8px;
}
.chat-header h4 i { color: var(--accent-primary); }
.chat-close {
    background: none; border: none;
    color: var(--text-secondary); cursor: pointer;
    font-size: 1.1rem; padding: 4px;
}
.chat-messages {
    flex: 1; overflow-y: auto;
    padding: 16px; min-height: 250px;
    max-height: 320px;
}
.chat-message {
    margin-bottom: 14px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem; line-height: 1.5;
}
.chat-message.bot {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}
.chat-message.user {
    background: rgba(45, 212, 168, 0.1);
    border: 1px solid rgba(45, 212, 168, 0.2);
    margin-left: 32px;
}
.chat-input-area {
    display: flex; gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid var(--border-color);
}
.chat-input-area input {
    flex: 1;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.875rem;
}
.chat-input-area input:focus {
    outline: none;
    border-color: var(--accent-primary);
}
.chat-input-area button {
    padding: 10px 14px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: #0d1117;
    cursor: pointer;
    font-size: 0.9rem;
}
.chat-api-note {
    padding: 8px 16px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    display: flex; align-items: center; justify-content: center; gap: 8px;
}
.chat-api-note small { color: var(--text-muted); font-size: 0.75rem; }
.chat-settings-btn {
    background: none; border: none;
    color: var(--text-muted); cursor: pointer;
    font-size: 0.85rem;
}
.chat-settings-btn:hover { color: var(--accent-primary); }
.chat-settings-modal {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 1001;
    align-items: center; justify-content: center;
}
.chat-settings-modal.open { display: flex; }
.chat-settings-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    width: 360px;
}
.chat-settings-content h4 { margin-bottom: 16px; }
.chat-settings-content label {
    display: block;
    font-size: 0.85rem; font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.chat-settings-content input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.9rem;
    margin-bottom: 16px;
}
.chat-settings-actions { display: flex; gap: 10px; }
.chat-settings-actions .btn { padding: 8px 20px; font-size: 0.875rem; }

/* ---------- Footer ---------- */
.footer {
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .metric-cards { grid-template-columns: repeat(2, 1fr); }
    .discovery-grid { grid-template-columns: 1fr; }
    .limitations-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: 1fr; }
    .findings-grid { grid-template-columns: 1fr; }
    .whatif-controls { grid-template-columns: 1fr; }
    .whatif-result { grid-template-columns: 1fr; }
    .explorer-metrics { grid-template-columns: repeat(3, 1fr); }
    .explorer-charts-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .nav-links {
        display: none; position: absolute;
        top: var(--nav-height); left: 0; right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 16px;
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }
    .two-col-section { grid-template-columns: 1fr; }
    .metric-cards { grid-template-columns: 1fr 1fr; }
    .hero-title { font-size: 1.75rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .hero-cta { flex-direction: column; align-items: center; }
    .explorer-controls { flex-direction: column; }
    .explorer-metrics { grid-template-columns: repeat(2, 1fr); }
    .limitations-grid { grid-template-columns: 1fr; }
    .chart-container { height: 320px; }
    .chat-panel { width: calc(100vw - 48px); right: -12px; }
}
@media (max-width: 480px) {
    .metric-cards { grid-template-columns: 1fr; }
    .explorer-metrics { grid-template-columns: 1fr; }
}