:root {
    /* Premium Light Theme Color Palette */
    --c-primary:     #3B82F6;       /* Vibrant Blue */
    --c-primary-hover: #2563EB;
    --c-primary-light: rgba(59, 130, 246, 0.1);
    
    --c-success:     #10B981;       /* Emerald */
    --c-success-light: rgba(16, 185, 129, 0.1);
    
    --c-danger:      #EF4444;       /* Rose */
    --c-danger-light: rgba(239, 68, 68, 0.1);
    
    --c-bg:          #F1F5F9;       /* Slate 50 for depth */
    --c-card:        rgba(255, 255, 255, 0.95);
    --c-border:      rgba(15, 23, 42, 0.08);
    
    --c-text:        #0F172A;
    --c-text-muted:  #475569;
    --c-text-dim:    #94A3B8;

    --radius-sm:     0.75rem;
    --radius-md:     1rem;
    --radius-lg:     1.5rem;
    --radius-xl:     2rem;

    --shadow-card:   0 1px 3px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.07);
    --shadow-glow:   0 0 40px rgba(59, 130, 246, 0.12);
    --transition:    0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Base ──────────────────────────────────────────────────── */
body {
    background: var(--c-bg);
    font-family: 'Inter', sans-serif;
    color: var(--c-text);
    position: relative;
    overflow-x: hidden;
}

/* Soft mesh gradient background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 20%, rgba(59, 130, 246, 0.05) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 70%, rgba(16, 185, 129, 0.04) 0%, transparent 60%);
    pointer-events: none;
    z-index: -1;
}

.main-wrapper > * {
    position: relative;
}

/* ── Hero / Breadcrumb Bar ─────────────────────────────────── */
.calc-hero {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.06) 0%, rgba(16, 185, 129, 0.05) 100%);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    padding: calc(2rem + 79px) 0 2.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.calc-hero::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--c-primary), transparent);
}

.calc-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--c-primary-light);
    border: 1px solid rgba(59, 130, 246, 0.25);
    color: var(--c-primary);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.35rem 1rem;
    border-radius: 2rem;
    margin-bottom: 1.25rem;
}

.calc-hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--c-text);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.calc-hero h1 span {
    color: var(--c-primary);
}

/* ── Containers & Cards ────────────────────────────────────── */
.calculator-container {
    padding: 3rem 0 5rem;
}

.calc-card {
    background: var(--c-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-card);
    margin-bottom: 2rem;
    transition: var(--transition-slow);
}

.calc-card:hover {
    box-shadow: var(--shadow-card), var(--shadow-glow);
    border-color: rgba(59, 130, 246, 0.15);
}

/* ── Typography & Forms ────────────────────────────────────── */
.calc-label {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--c-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.75rem;
    display: block;
}

.calc-input, .calc-select {
    background: #ffffff;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-md);
    padding: 0.875rem 1.25rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--c-text);
    width: 100%;
    transition: var(--transition);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.calc-input:focus, .calc-select:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 4px var(--c-primary-light);
    outline: none;
}

/* Vehicle Type Selector */
.v-type-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.v-type-item {
    background: var(--c-bg);
    padding: 1rem;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--c-text-muted);
}

.v-type-item:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
}

.v-type-item i {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.v-type-item.active {
    background: var(--c-primary);
    border-color: var(--c-primary);
    color: white;
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

/* ── Value Display Section ─────────────────────────────────── */
.result-hero {
    background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.2);
}

.result-hero::before {
    content: '';
    position: absolute;
    top: -50%; right: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(59,130,246,0.1) 0%, transparent 60%);
    pointer-events: none;
}

.result-hero .stat-label {
    color: var(--c-text-dim);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result-hero .result-hero-value {
    color: #ffffff;
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin: 0.5rem 0;
    letter-spacing: -0.03em;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.stat-card {
    background: var(--c-bg);
    border: 1px solid var(--c-border);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    background: #ffffff;
    border-color: rgba(59,130,246,0.2);
    transform: translateY(-2px);
}

.stat-card .stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--c-text-muted);
    margin-bottom: 0.25rem;
}

.stat-card .stat-value {
    font-size: 1.25rem;
    font-weight: 800;
}

.chart-container {
    height: 300px;
    position: relative;
}

/* ── SEO Section Typography ────────────────────────────────── */
.seo-content .calc-card {
    padding: 3.5rem;
}

.seo-content h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--c-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.seo-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--c-text);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.seo-content h4 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--c-text);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.seo-content p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--c-text-muted);
    margin-bottom: 1.25rem;
}

.seo-content ul, .seo-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.seo-content li {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--c-text-muted);
    margin-bottom: 0.75rem;
}

.seo-content li strong {
    color: var(--c-text);
}

/* ── Related Tools ─────────────────────────────────────────── */
.tool-link-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--c-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    text-decoration: none;
    color: var(--c-text);
    transition: var(--transition);
    height: 100%;
}

.tool-link-card i {
    font-size: 2.5rem;
    color: var(--c-primary);
    margin-bottom: 1rem;
    transition: var(--transition);
}

.tool-link-card h6 {
    font-weight: 700;
    margin: 0;
}

.tool-link-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card);
    border-color: var(--c-primary-light);
    color: var(--c-primary);
}

.tool-link-card:hover i {
    transform: scale(1.1);
}

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

.animate-fade {
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 991.98px) {
    .calc-hero { padding: calc(1.5rem + 66px) 0 1.5rem; }
    .calculator-container { padding: 2rem 0; }
    .calc-card { padding: 1.5rem; }
    .seo-content .calc-card { padding: 1.5rem; }
    .result-hero { padding: 2rem 1.5rem; }
    .result-hero .result-hero-value { font-size: 2.5rem; }
    .v-type-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; }
}