:root {
    --primary: #1A429B;
    --primary-hover: #13337A;
    --primary-light: #EEF3FA;
    --primary-glow: rgba(26, 66, 155, 0.12);
    --secondary: #00974A;
    --secondary-light: #EBF8F1;
    --accent: #F58220;
    --accent-hover: #E06F12;
    --accent-light: #FFF9F3;
    --danger: #E31E24;
    --danger-light: #FDEDED;
    --bg: #FFF9F3;
    --card-bg: #FFFFFF;
    --text: #101828;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --font-heading: 'Lexend Deca', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    background-size: 44px 44px;
    background-image: radial-gradient(circle, rgba(26, 66, 155, 0.08) 1.2px, transparent 1.2px);
    color: var(--text);
    line-height: 1.65;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .card-title, .hero-title {
    font-family: var(--font-heading);
    letter-spacing: -0.025em;
    font-weight: 700;
}

.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 24px 20px 60px;
}

/* Hero Section (Clean Sovereign BRICS Aesthetic) */
.calculator-hero {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 20px 20px;
    position: relative;
}

.hero-pill-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 9999px;
    background: #FFFFFF;
    color: var(--primary);
    border: 1px solid rgba(26, 66, 155, 0.2);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    box-shadow: 0 1px 3px rgba(16, 24, 40, 0.05);
    margin-bottom: 20px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--secondary);
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
    font-size: 38px;
    font-weight: 800;
    color: #101828;
    line-height: 1.2;
    margin-bottom: 14px;
}

.hero-title-gradient {
    background: linear-gradient(135deg, #1A429B 0%, #2563EB 50%, #F58220 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 16px;
    color: #475569;
    max-width: 720px;
    margin: 0 auto;
    line-height: 1.6;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    align-items: start;
}

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

.card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 32px;
    border: 1px solid rgba(226, 232, 240, 0.9);
    box-shadow: 0 4px 20px -4px rgba(16, 24, 40, 0.05);
    transition: all 0.25s ease;
}

.card:hover {
    box-shadow: 0 12px 30px -6px rgba(16, 24, 40, 0.08);
    border-color: rgba(26, 66, 155, 0.25);
}

.card-title {
    font-size: 20px;
    font-weight: 700;
    color: #101828;
    margin-bottom: 24px;
    padding-bottom: 14px;
    border-bottom: 1px solid #F1F5F9;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-title-badge {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--primary-light);
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.form-section {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px dashed #E2E8F0;
}

.form-section:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.section-label {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #64748B;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 16px;
}

.form-row:last-child {
    margin-bottom: 0;
}

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

.form-group.full-width {
    grid-column: 1 / -1;
}

label {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: #334155;
}

input[type="number"],
select {
    padding: 10px 14px;
    border: 1px solid #CBD5E1;
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    color: #101828;
    transition: all 0.2s ease;
    background: #FFFFFF;
}

.radio-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    background: #FAF8F5;
    padding: 8px 16px;
    border-radius: 9999px;
    border: 1px solid #E2E8F0;
    transition: all 0.2s ease;
}

.radio-option:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.radio-option input[type="radio"] {
    accent-color: var(--primary);
    width: 15px;
    height: 15px;
}

.radio-option span {
    font-size: 13px;
    font-weight: 600;
    color: #334155;
}

.calculate-btn {
    width: 100%;
    padding: 16px 28px;
    background: var(--primary);
    color: #FFFFFF;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    font-family: var(--font-heading);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 12px;
    box-shadow: 0 4px 14px rgba(26, 66, 155, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.calculate-btn:hover {
    background: var(--primary-hover);
    box-shadow: 0 8px 22px rgba(26, 66, 155, 0.35);
    transform: translateY(-1px);
}

.calculate-btn:active {
    transform: scale(0.99);
}

.results-panel {
    display: none;
}

.results-panel.active {
    display: block;
}

.traffic-light {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 20px 24px;
    background: #FAF8F5;
    border-radius: 16px;
    margin-bottom: 24px;
    border: 1px solid rgba(226, 232, 240, 0.9);
}

.light-indicator {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
    transition: transform 0.3s;
    flex-shrink: 0;
}

.light-indicator.green {
    background: var(--secondary);
    color: white;
    box-shadow: 0 4px 16px rgba(0, 151, 74, 0.35);
}

.light-indicator.yellow {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 16px rgba(245, 130, 32, 0.35);
}

.light-indicator.red {
    background: var(--danger);
    color: white;
    box-shadow: 0 4px 16px rgba(227, 30, 36, 0.35);
}

.light-status h3 {
    font-size: 18px;
    font-weight: 700;
    color: #101828;
    margin-bottom: 4px;
}

.light-status p {
    font-size: 13px;
    color: var(--text-muted);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin-bottom: 24px;
}

@media (max-width: 600px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

.stat-card {
    background: #FAF8F5;
    padding: 16px;
    border-radius: 14px;
    text-align: center;
    border: 1px solid #E2E8F0;
    transition: all 0.2s ease;
}

.stat-card:hover {
    border-color: rgba(26, 66, 155, 0.3);
    background: #FFFFFF;
}

.stat-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-top: 4px;
}

.chart-container {
    margin-bottom: 24px;
    background: #FAF8F5;
    border-radius: 16px;
    padding: 18px;
    border: 1px solid #E2E8F0;
}

.chart-container canvas {
    max-height: 200px;
}

.wave-grid-container {
    margin-bottom: 24px;
    background: #FAF8F5;
    border-radius: 16px;
    padding: 18px;
    border: 1px solid #E2E8F0;
}

.wave-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
}

.wave-cell {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 700;
    color: white;
    transition: transform 0.2s;
}

.wave-cell:hover {
    transform: scale(1.12);
}

.wave-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.wave-label {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.config-output {
    background: #0F172A;
    border-radius: 16px;
    padding: 24px 20px 20px;
    margin-bottom: 24px;
    position: relative;
    border: 1px solid #1E293B;
    box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.3);
}

.config-output pre {
    font-family: var(--font-mono);
    font-size: 13px;
    color: #E2E8F0;
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.8;
}

.config-output .key {
    color: #60A5FA;
    font-weight: 600;
}

.config-output .value {
    color: #34D399;
}

.copy-btn {
    position: absolute;
    top: 14px;
    right: 14px;
    padding: 6px 14px;
    background: rgba(255,255,255,0.12);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
}

.warnings-container {
    margin-top: 16px;
}

.warning-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 10px;
    font-size: 13px;
    line-height: 1.5;
}

.warning-item:last-child {
    margin-bottom: 0;
}

.warning-item.info {
    background: var(--primary-light);
    border-left: 4px solid var(--primary);
    color: #1E3A8A;
}

.warning-item.warning {
    background: #FFFBEA;
    border-left: 4px solid var(--accent);
    color: #92400E;
}

.warning-item.danger {
    background: var(--danger-light);
    border-left: 4px solid var(--danger);
    color: #991B1B;
}

.warning-item.success {
    background: var(--secondary-light);
    border-left: 4px solid var(--secondary);
    color: #065F46;
}

.warning-icon {
    font-size: 16px;
    flex-shrink: 0;
}

.hidden {
    display: none !important;
}

.recommendation-section {
    background: linear-gradient(135deg, #1A429B 0%, #13337A 100%);
    color: white;
    margin-bottom: 24px;
    overflow: hidden;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 25px -5px rgba(26, 66, 155, 0.35);
}

.recommendation-section .card-title {
    color: white;
    border-bottom-color: rgba(255,255,255,0.15);
}

.rec-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

@media (max-width: 600px) {
    .rec-grid {
        grid-template-columns: 1fr;
    }
}

.rec-item {
    background: rgba(255,255,255,0.1);
    padding: 14px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.rec-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.8;
    margin-bottom: 4px;
    font-weight: 600;
}

.rec-value {
    font-size: 18px;
    font-weight: 700;
    color: #FFFFFF;
}

.rec-reason {
    font-size: 12px;
    opacity: 0.85;
    margin-top: 4px;
    line-height: 1.4;
}

.apply-rec-btn {
    margin-top: 18px;
    padding: 12px 24px;
    background: var(--secondary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 700;
    font-family: var(--font-heading);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(0, 151, 74, 0.3);
}

.apply-rec-btn:hover {
    background: #007D3E;
    transform: translateY(-1px);
}

#recommendationContainer {
    margin-top: 24px;
}

.rec-badge {
    background: rgba(255,255,255,0.15);
    padding: 6px 12px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    display: inline-block;
}

.rec-summary {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 16px;
    padding: 14px;
    background: rgba(255,255,255,0.1);
    border-radius: 12px;
    font-size: 13px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.rec-summary strong {
    color: #93C5FD;
}