:root {
    --primary: #0f766e;
    --primary-hover: #115e59;
    --primary-light: #f0fdfa;
    --primary-border: #99f6e4;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: #eff6ff;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    
    --bg-page: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-alt: #f1f5f9;
    --bg-card: #ffffff;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --border-focus: #0f766e;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
    --bg-page: #090d16;
    --bg-surface: #111827;
    --bg-surface-alt: #1f2937;
    --bg-card: #141e33;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #27354f;
    --border-focus: #14b8a6;
    
    --primary-light: #062f2d;
    --primary-border: #134e4a;
    --accent-light: #172554;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    text-decoration: underline;
}

.container {
    width: 100%;
    max-width: 1240px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

/* Header & Navigation */
.site-header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(12px);
    background-color: rgba(255, 255, 255, 0.92);
}

[data-theme="dark"] .site-header {
    background-color: rgba(17, 24, 39, 0.92);
}

.header-top-bar {
    background: linear-gradient(90deg, #042f2e, #0f766e, #0369a1);
    color: #ffffff;
    font-size: 0.8125rem;
    padding: 0.4rem 0;
    font-weight: 500;
}

.header-top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.top-bar-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.top-bar-contact {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.top-bar-contact a {
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    text-decoration: none;
    font-weight: 600;
}

.top-bar-contact a:hover {
    text-decoration: underline;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.9rem 0;
}

.brand-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.site-logo {
    height: 48px;
    width: auto;
    max-width: 175px;
    object-fit: contain;
    display: block;
    transition: transform 0.2s ease;
}

.brand-wrapper:hover .site-logo {
    transform: scale(1.02);
}

.logo-dark {
    display: none;
}

[data-theme="dark"] .logo-light {
    display: none;
}

[data-theme="dark"] .logo-dark {
    display: block;
}

.footer-logo {
    height: 44px;
    width: auto;
    max-width: 165px;
    object-fit: contain;
    display: block;
    margin-bottom: 0.75rem;
    transition: transform 0.2s ease;
}

.footer-logo:hover {
    transform: scale(1.02);
}

@media (max-width: 640px) {
    .site-logo {
        height: 38px;
        max-width: 135px;
    }
}

.brand-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #0f766e, #0ea5e9);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 1.35rem;
    font-weight: 800;
    box-shadow: 0 4px 10px rgba(15, 118, 110, 0.3);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.brand-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.75rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
    text-decoration: none;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-toggle-btn {
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle-btn:hover {
    background: var(--border-color);
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 2px 4px rgba(15, 118, 110, 0.2);
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: #ffffff;
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(15, 118, 110, 0.3);
}

.btn-secondary {
    background-color: var(--bg-surface-alt);
    color: var(--text-primary);
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    text-decoration: none;
}

.btn-secondary:hover {
    background-color: var(--border-color);
    text-decoration: none;
}

/* Hero Section */
.hero-section {
    padding: 3.5rem 0 2rem;
    background: radial-gradient(circle at 50% 0%, var(--primary-light) 0%, transparent 70%);
}

.hero-header {
    text-align: center;
    max-width: 860px;
    margin: 0 auto 2.5rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary-border);
    padding: 4px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.hero-title span {
    color: var(--primary);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Calculator Grid Layout */
.calculator-wrapper {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    margin-bottom: 3.5rem;
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

@media (max-width: 992px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

.calc-input-panel {
    padding: 2.25rem;
    border-right: 1px solid var(--border-color);
}

@media (max-width: 992px) {
    .calc-input-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 1.75rem;
    }
}

.calc-output-panel {
    padding: 2.25rem;
    background: var(--bg-surface-alt);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

@media (max-width: 992px) {
    .calc-output-panel {
        padding: 1.75rem;
    }
}

/* Mode Switcher Tabs */
.mode-toggle-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--bg-surface-alt);
    padding: 4px;
    border-radius: var(--radius-md);
    margin-bottom: 1.75rem;
    border: 1px solid var(--border-color);
}

.mode-tab-btn {
    background: transparent;
    border: none;
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.mode-tab-btn.active {
    background: var(--bg-surface);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Form Groups */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-label-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: normal;
}

.currency-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 1rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-muted);
    pointer-events: none;
}

.calc-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    outline: none;
    font-family: inherit;
}

.calc-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}

.amount-in-words {
    margin-top: 0.4rem;
    font-size: 0.8125rem;
    color: var(--primary);
    font-weight: 500;
    min-height: 1.2rem;
}

/* GST Slab Selector Buttons */
.slab-btn-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

@media (max-width: 480px) {
    .slab-btn-group {
        grid-template-columns: repeat(2, 1fr);
    }
}

.slab-btn {
    background: var(--bg-surface);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.65rem 0.5rem;
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.slab-btn span.slab-subtitle {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-top: 2px;
}

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

.slab-btn.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: 0 0 0 2px rgba(15, 118, 110, 0.2);
}

.custom-slab-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.custom-slab-input {
    width: 90px;
    padding: 0.5rem 0.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    color: var(--text-primary);
    outline: none;
}

.custom-slab-input:focus {
    border-color: var(--border-focus);
}

/* Transaction Type Radio Options */
.tx-type-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.tx-option {
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    cursor: pointer;
    background: var(--bg-surface);
    transition: var(--transition);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.tx-option:hover {
    border-color: var(--primary);
}

.tx-option.active {
    border-color: var(--primary);
    background: var(--primary-light);
}

.tx-option input[type="radio"] {
    margin-top: 0.2rem;
    accent-color: var(--primary);
}

.tx-option-content {
    display: flex;
    flex-direction: column;
}

.tx-option-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
}

.tx-option-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Output Panel Elements */
.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.output-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

.output-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.summary-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0;
    border-bottom: 1px dashed var(--border-color);
    font-size: 0.9375rem;
}

.summary-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.summary-row:first-child {
    padding-top: 0;
}

.summary-row.highlight {
    background: var(--primary-light);
    margin: 0.5rem -1.25rem -1.25rem;
    padding: 1rem 1.25rem;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    border-top: 2px solid var(--primary-border);
    border-bottom: none;
}

.summary-label {
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.summary-val {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.05rem;
}

.summary-row.highlight .summary-label {
    color: var(--primary-hover);
    font-size: 1rem;
    font-weight: 700;
}

.summary-row.highlight .summary-val {
    color: var(--primary);
    font-size: 1.5rem;
    font-weight: 800;
}

/* Split Tax Breakdown Pills */
.tax-split-box {
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.tax-split-header {
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.tax-split-items {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.tax-split-items.full-width {
    grid-template-columns: 1fr;
}

.split-pill {
    background: var(--bg-surface-alt);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border-color);
}

.split-pill-top {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
}

.split-pill-val {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 2px;
}

/* Action Buttons */
.calc-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.btn-action {
    padding: 0.75rem;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.btn-copy {
    background: var(--primary);
    color: #ffffff;
}

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

.btn-print {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1.5px solid var(--border-color);
}

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

/* Dynamic Live Formula Box */
.formula-breakdown-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 3.5rem;
    box-shadow: var(--shadow-sm);
}

.formula-card-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.formula-card-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.formula-math-display {
    background: var(--bg-surface-alt);
    border-left: 4px solid var(--primary);
    padding: 1rem 1.25rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.9375rem;
    color: var(--text-primary);
    line-height: 1.8;
}

.formula-math-display strong {
    color: var(--primary);
}

/* All Slabs Comparison Table */
.all-slabs-section {
    margin-bottom: 4rem;
}

.section-head {
    margin-bottom: 1.75rem;
    text-align: center;
}

.section-tag {
    display: inline-block;
    color: var(--primary);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.section-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto;
}

.table-responsive {
    overflow-x: auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.styled-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9375rem;
}

.styled-table th, .styled-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.styled-table th {
    background: var(--bg-surface-alt);
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.styled-table tbody tr:hover {
    background-color: var(--primary-light);
}

.styled-table tr:last-child td {
    border-bottom: none;
}

.slab-badge {
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.8125rem;
    display: inline-block;
}

.badge-0 { background: #e2e8f0; color: #475569; }
.badge-3 { background: #fef3c7; color: #92400e; }
.badge-5 { background: #dbeafe; color: #1e40af; }
.badge-12 { background: #e0e7ff; color: #4338ca; }
.badge-18 { background: #ccfbf1; color: #0f766e; }
.badge-28 { background: #fee2e2; color: #991b1b; }

/* HSN SAC Finder Section */
.hsn-finder-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 4rem;
}

.hsn-search-bar {
    position: relative;
    max-width: 600px;
    margin: 0 auto 1.5rem;
}

.hsn-search-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition);
}

.hsn-search-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}

.hsn-search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.hsn-results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.hsn-item-card {
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    transition: var(--transition);
}

.hsn-item-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary-border);
    box-shadow: var(--shadow-sm);
}

.hsn-item-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
}

.hsn-code {
    font-family: monospace;
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-light);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.hsn-name {
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.hsn-desc {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* Comprehensive Guide / Content Sections (SEO, GEO, AIO, AEO) */
.content-hub {
    margin-bottom: 4rem;
}

.content-block {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
    .content-block {
        padding: 1.5rem;
    }
}

.content-block h2 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.content-block h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 1.75rem 0 0.75rem;
}

.content-block p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.content-block ul, .content-block ol {
    margin-left: 1.5rem;
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

.content-block li {
    margin-bottom: 0.5rem;
}

.geo-definition-card {
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    border: 1px solid var(--primary-border);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
}

.geo-definition-title {
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.geo-definition-text {
    font-size: 0.9375rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 0 !important;
}

/* Step by Step Cards */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin: 1.5rem 0;
}

@media (max-width: 768px) {
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

.step-card {
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    position: relative;
}

.step-number {
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: #ffffff;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.step-title {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.step-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* EEAT Author / Agency Box */
.eeat-box {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-surface-alt));
    border: 2px solid var(--primary-border);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    margin-bottom: 3.5rem;
    box-shadow: var(--shadow-md);
}

.eeat-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 2rem;
    align-items: center;
}

@media (max-width: 900px) {
    .eeat-grid {
        grid-template-columns: 1fr;
    }
}

.author-profile {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
}

.author-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #0f766e, #2563eb);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 2rem;
    font-weight: 800;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(15, 118, 110, 0.25);
}

.author-meta-name {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

.author-meta-title {
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.author-bio {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.eeat-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.eeat-pill {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.eeat-contact-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.contact-card-title {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.contact-card-desc {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.contact-phone-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    margin-bottom: 0.75rem;
    padding: 0.5rem;
    background: var(--primary-light);
    border-radius: var(--radius-md);
}

.contact-phone-link:hover {
    text-decoration: none;
    background: #ccfbf1;
}

.contact-whatsapp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    background: #25d366;
    color: #ffffff;
    font-weight: 600;
    padding: 0.65rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    text-decoration: none;
    transition: var(--transition);
}

.contact-whatsapp-btn:hover {
    background: #1ebc59;
    color: #ffffff;
    text-decoration: none;
}

/* FAQ Accordion */
.faq-section {
    margin-bottom: 4rem;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active {
    border-color: var(--primary);
}

.faq-question {
    width: 100%;
    padding: 1.25rem 1.5rem;
    text-align: left;
    background: none;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
}

.faq-icon {
    font-size: 1.25rem;
    color: var(--text-muted);
    transition: transform 0.2s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-answer {
    padding: 0 1.5rem 1.25rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

/* Consultation / Callback Modal or Banner */
.consultation-banner {
    background: linear-gradient(135deg, #042f2e, #0f766e, #1e3a8a);
    color: #ffffff;
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    margin-bottom: 4rem;
}

.consultation-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.consultation-subtitle {
    font-size: 1.05rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 1.75rem;
}

.consultation-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Footer */
.site-footer {
    background: #090d16;
    color: #94a3b8;
    padding: 4rem 0 2rem;
    font-size: 0.875rem;
    border-top: 1px solid #1e293b;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

@media (max-width: 900px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
}

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

.footer-col h4 {
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.6rem;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
}

.footer-links a:hover {
    color: #ffffff;
    text-decoration: underline;
}

.footer-contact-info p {
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-contact-info strong {
    color: #ffffff;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid #1e293b;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-disclaimer {
    font-size: 0.75rem;
    color: #64748b;
    line-height: 1.5;
    margin-top: 1rem;
}

/* Print Stylesheet for Tax Invoices */
@media print {
    body {
        background: #ffffff !important;
        color: #000000 !important;
    }
    .site-header, .header-top-bar, .hero-section, .calc-actions, .theme-toggle-btn, .all-slabs-section, .hsn-finder-card, .content-hub, .faq-section, .consultation-banner, .site-footer {
        display: none !important;
    }
    .calculator-wrapper {
        border: 2px solid #000000 !important;
        box-shadow: none !important;
    }
    .calc-input-panel {
        display: none !important;
    }
    .calculator-grid {
        grid-template-columns: 1fr !important;
    }
    .calc-output-panel {
        background: #ffffff !important;
        padding: 2rem !important;
    }
    .invoice-print-header {
        display: block !important;
        margin-bottom: 2rem;
        border-bottom: 2px solid #000;
        padding-bottom: 1rem;
    }
}
.invoice-print-header {
    display: none;
}

/* Diagram & Quick TOC Navigation */
.tax-diagram-wrapper {
    margin: 2rem 0;
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.diagram-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: var(--radius-md);
}

.quick-toc {
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin: 1.75rem 0;
}

.quick-toc-title {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quick-toc-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.25rem;
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
}

.quick-toc-list li a {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.quick-toc-list li a:hover {
    text-decoration: underline;
}

/* Blog, Real Stats & Case Studies Styles */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
    margin: 2rem 0;
}

@media (max-width: 992px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 540px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-border);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.stat-number {
    font-size: 2.1rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.1;
    margin-bottom: 0.4rem;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}

.stat-source {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Case Study Cards */
.case-study-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin: 2rem 0;
}

.case-study-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    box-shadow: var(--shadow-sm);
    position: relative;
}

@media (max-width: 768px) {
    .case-study-card {
        padding: 1.5rem;
    }
}

.case-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.case-badge {
    background: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary-border);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.case-title {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0.5rem 0;
    line-height: 1.3;
}

.case-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.case-section-title {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 1rem 0 0.4rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.case-results-box {
    background: linear-gradient(135deg, var(--primary-light), var(--bg-surface-alt));
    border: 1.5px solid var(--primary-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-top: 1.25rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    text-align: center;
}

@media (max-width: 680px) {
    .case-results-box {
        grid-template-columns: 1fr;
    }
}

.case-stat-val {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.1;
}

.case-stat-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-top: 0.25rem;
}

.eeat-trust-seal {
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
}

.seal-icon {
    font-size: 2rem;
    color: var(--primary);
}

/* ============================================================
   BLOG SYSTEM & FEATURED BLOGS STYLES
   ============================================================ */
.featured-blogs-section {
    margin: 4.5rem auto;
    width: 100%;
}

.section-header-centered {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 2.5rem;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    background-color: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary-border);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.section-header-centered h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.25;
    margin-bottom: 0.75rem;
}

.section-header-centered p {
    font-size: 1rem;
    color: var(--text-secondary);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
}

/* Home Page Centered Alignment */
.featured-blogs-section .blog-grid {
    max-width: 1100px;
    margin: 0 auto;
    justify-content: center;
}

.featured-blogs-section .blog-card {
    text-align: center;
}

.featured-blogs-section .blog-card-body {
    text-align: center;
    align-items: center;
}

.featured-blogs-section .blog-card-meta {
    justify-content: center;
}

.featured-blogs-section .blog-card-title {
    text-align: center;
}

.featured-blogs-section .blog-card-excerpt {
    text-align: center;
    max-width: 95%;
    margin-left: auto;
    margin-right: auto;
}

.featured-blogs-section .blog-card-tags {
    justify-content: center;
}

.featured-blogs-section .blog-card-footer {
    width: 100%;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

@media (max-width: 900px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }
}

.blog-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.2s ease;
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.blog-card-media {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: #0f172a;
    overflow: hidden;
}

.blog-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.blog-card:hover .blog-card-img {
    transform: scale(1.03);
}

.blog-category-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(6px);
    color: #5eead4;
    border: 1px solid rgba(45, 212, 191, 0.4);
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-sm);
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    z-index: 2;
}

.blog-read-time {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(6px);
    color: #e2e8f0;
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-sm);
    font-size: 0.6875rem;
    font-weight: 600;
    z-index: 2;
}

.blog-card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.blog-card-title {
    font-size: 1.25rem;
    font-weight: 800;
    line-height: 1.35;
    margin-bottom: 0.75rem;
}

.blog-card-title a {
    color: var(--text-primary);
    text-decoration: none;
}

.blog-card-title a:hover {
    color: var(--primary);
}

.blog-card-excerpt {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.25rem;
    flex: 1;
}

.blog-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.25rem;
}

.blog-tag-chip {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-muted);
    background-color: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all 0.15s ease;
}

.blog-tag-chip:hover {
    color: var(--primary);
    border-color: var(--primary);
    text-decoration: none;
}

.blog-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.blog-author-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.blog-author-avatar {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

.blog-read-link {
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.blog-read-link:hover {
    text-decoration: underline;
}

/* Category Filter Bar */
.blog-filters-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.filter-btn {
    padding: 0.45rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: var(--bg-surface);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.filter-btn.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

/* Article Reader Page Styles */
.article-container {
    max-width: 900px;
    margin: 2rem auto 4rem;
}

.article-hero {
    margin-bottom: 2rem;
}

.article-meta-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.article-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.25;
    margin-bottom: 1.25rem;
}

.article-featured-banner {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 2.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    background-color: #0f172a;
}

.article-featured-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-body {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.article-body h2 {
    font-size: 1.5rem;
    font-weight: 800;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.article-body h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-footer-tags {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}