/* ═══════════════════════════════════════════════════════════════════════════
   CUSTOMER CHURN PREDICTOR - Styles
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --accent-blue: #00d4ff;
    --accent-green: #00ff88;
    --accent-purple: #8b5cf6;
    --accent-orange: #ff9f43;
    --accent-red: #ff4757;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --radius: 12px;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

.app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 2.5rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.accuracy-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid rgba(0, 255, 136, 0.3);
    border-radius: var(--radius);
}

.accuracy-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-green);
}

.accuracy-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

/* Form Section */
.form-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
}

.form-section h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.section-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-group input,
.form-group select {
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.checkbox-group {
    flex-direction: row;
    align-items: center;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-purple);
}

.btn-predict {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    border: none;
    border-radius: var(--radius);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-predict:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
}

/* Results Section */
.results-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.result-card,
.features-card,
.recommendations-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.result-card h2 {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

/* Risk Meter */
.risk-meter {
    margin-bottom: 1.5rem;
}

.meter-container {
    height: 12px;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-orange), var(--accent-red));
    border-radius: 6px;
    position: relative;
    margin-bottom: 0.5rem;
}

.meter-fill {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 6px;
    transform-origin: right;
    transition: transform 0.5s ease-out;
}

.meter-needle {
    position: absolute;
    top: -4px;
    width: 4px;
    height: 20px;
    background: white;
    border-radius: 2px;
    transition: left 0.5s ease-out;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.risk-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.risk-value {
    text-align: center;
    margin-bottom: 1rem;
}

.risk-percent {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.risk-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.risk-classification {
    text-align: center;
}

.risk-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.risk-badge.low {
    background: rgba(0, 255, 136, 0.15);
    color: var(--accent-green);
}

.risk-badge.medium {
    background: rgba(255, 159, 67, 0.15);
    color: var(--accent-orange);
}

.risk-badge.high {
    background: rgba(255, 71, 87, 0.15);
    color: var(--accent-red);
}

/* Features Card */
.features-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

#featureChart {
    max-height: 200px;
}

/* Recommendations */
.recommendations-card h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.recommendations-card ul {
    list-style: none;
}

.recommendations-card li {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-left: 3px solid var(--accent-purple);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer a {
    color: var(--accent-purple);
    text-decoration: none;
}

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

@media (max-width: 600px) {
    .header {
        flex-direction: column;
        gap: 1rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }
}