@view-transition {
    navigation: auto;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100%;
    height: 100%;
}

/* Header & navigation */

.header {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(5, 150, 105, 0.15);
}

.header-inner {
    position: relative;
}

.logo-link {
    text-decoration: none;
}

.main-logo {
    height: 40px;
    width: auto;
    display: block;
}

.site-title {
    text-decoration: none;
}

/* Desktop center nav */
.desktop-center-nav {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

/* Top-level nav links */
.nav-link {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
}

.nav-link:hover {
    color: #e5e7eb;
    transform: scale(1.05);
}

/* Dropdown */

.dropdown {
    position: relative;
}

.dropdown-toggle {
    background: none;
    border: none;
    cursor: pointer;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    min-width: 220px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    border-radius: 12px;
    margin-top: 8px;
    overflow: hidden;
    animation: fadeInDown 0.3s ease;
    z-index: 20;
}

.dropdown.open .dropdown-content {
    display: block;
}

.dropdown-content a {
    color: #4a5568;
    padding: 12px 20px;
    text-decoration: none;
    display: block;
    transition: all 0.3s ease;
    font-size: 14px;
}

.dropdown-content a:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: #ffffff;
    padding-left: 28px;
}

/* Mobile menu */

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 24px;
    cursor: pointer;
    z-index: 30;
}

.mobile-menu {
    display: none;
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    border-radius: 12px;
    margin-top: 12px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
    overflow: hidden;
}

.mobile-menu.open {
    display: block;
    animation: slideDown 0.25s ease-out;
}

.mobile-menu a {
    display: block;
    padding: 12px 18px;
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.mobile-menu a:last-child {
    border-bottom: none;
}

.mobile-menu a:hover {
    background: rgba(255, 255, 255, 0.08);
}

/* Page header */

.page-header {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: white;
    padding: 80px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120"><path d="M0,0 Q300,60 600,30 T1200,0 L1200,120 L0,120 Z" fill="rgba(255,255,255,0.05)"/></svg>') repeat-x bottom;
    background-size: 1200px 120px;
    opacity: 0.3;
}

.page-header h1 {
    font-size: 42px;
    font-weight: 900;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    animation: slideInDown 0.6s ease;
}

.page-header p {
    font-size: 20px;
    opacity: 0.95;
    position: relative;
    z-index: 1;
    animation: slideInUp 0.6s ease;
}

/* Calculator layout */

.calculator-container {
    max-width: 1400px;
    margin: -60px auto 60px;
    padding: 0 20px;
    position: relative;
    z-index: 10;
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.calculator-card {
    background: #ffffff;
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    animation: slideUp 0.6s ease;
}

.card-title {
    font-size: 28px;
    font-weight: 800;
    color: #8b5cf6;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.input-section {
    margin-bottom: 28px;
}

.input-label {
    display: block;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 10px;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-wrapper {
    position: relative;
}

.input-field {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid #cbd5e0;
    border-radius: 12px;
    font-size: 18px;
    transition: all 0.3s ease;
    font-weight: 600;
}

.input-field:focus {
    outline: none;
    border-color: #8b5cf6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.input-prefix {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #4a5568;
    font-weight: 600;
    font-size: 18px;
    pointer-events: none;
}

.input-suffix {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #4a5568;
    font-weight: 600;
    font-size: 18px;
    pointer-events: none;
}

.input-field.with-prefix {
    padding-left: 50px;
}

.input-field.with-suffix {
    padding-right: 80px;
}

.slider-container {
    margin-top: 12px;
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: linear-gradient(to right, #8b5cf6 0%, #7c3aed 100%);
    outline: none;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.slider:hover {
    opacity: 1;
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #8b5cf6;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.4);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #8b5cf6;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.4);
    border: none;
}

/* Buttons */

.calculate-btn {
    width: 100%;
    padding: 20px;
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 32px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.calculate-btn:active {
    transform: scale(0.98);
}

/* Results */

.results-section {
    display: none;
}

.results-section.show {
    display: block;
}

.result-summary {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}

.result-box {
    background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%);
    padding: 24px;
    border-radius: 16px;
    border-left: 4px solid #8b5cf6;
    transition: all 0.3s ease;
}

.result-box:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.15);
}

.result-box.highlight {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    border: none;
    grid-column: 1 / -1;
}

.result-box.highlight .result-label {
    color: rgba(255, 255, 255, 0.9);
}

.result-box.highlight .result-value {
    color: #ffffff;
    font-size: 48px;
}

.result-box.highlight .result-subtext {
    color: rgba(255, 255, 255, 0.8);
}

.result-label {
    font-weight: 600;
    color: #4a5568;
    font-size: 14px;
    margin-bottom: 8px;
}

.result-value {
    font-weight: 800;
    color: #8b5cf6;
    font-size: 32px;
}

.result-subtext {
    font-size: 13px;
    color: #64748b;
    margin-top: 4px;
}

/* Charts / stats */

.chart-container {
    background: white;
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    margin-bottom: 32px;
}

.chart-title {
    font-size: 20px;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.progress-bar-container {
    background: #e2e8f0;
    border-radius: 12px;
    height: 40px;
    overflow: hidden;
    position: relative;
    margin: 24px 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #10b981 0%, #059669 100%);
    border-radius: 12px;
    transition: width 1s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 16px;
}

.progress-bar.warning {
    background: linear-gradient(90deg, #f59e0b 0%, #d97706 100%);
}

.progress-bar.danger {
    background: linear-gradient(90deg, #ef4444 0%, #dc2626 100%);
}

/* Timeline */

.timeline-container {
    position: relative;
    padding: 20px 0;
}

.timeline-line {
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, #8b5cf6 0%, #7c3aed 100%);
}

.timeline-item {
    position: relative;
    padding-left: 70px;
    margin-bottom: 32px;
}

.timeline-dot {
    position: absolute;
    left: 20px;
    top: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #8b5cf6;
    border: 4px solid white;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.timeline-content {
    background: #f8fafc;
    padding: 16px 20px;
    border-radius: 12px;
    border-left: 3px solid #8b5cf6;
}

.timeline-year {
    font-weight: 700;
    color: #8b5cf6;
    font-size: 18px;
    margin-bottom: 8px;
}

.timeline-text {
    color: #4a5568;
    font-size: 14px;
    line-height: 1.6;
}

/* Stats grid */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 24px;
}

.stat-item {
    background: #f8fafc;
    padding: 16px;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
}

.stat-label {
    font-size: 13px;
    color: #64748b;
    margin-bottom: 6px;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
    color: #8b5cf6;
}

/* Download buttons */

.download-buttons {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.download-btn {
    flex: 1;
    padding: 14px 24px;
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Info cards */

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 40px;
    margin-bottom: 40px;
}

.info-card {
    background: white;
    padding: 28px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid #8b5cf6;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(139, 92, 246, 0.2);
}

.info-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-card p {
    color: #4a5568;
    line-height: 1.7;
    font-size: 15px;
}

.info-badge {
    display: inline-block;
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    margin-top: 12px;
}

/* Blog / SEO section */

.blog-section {
    max-width: 900px;
    margin: 40px auto 80px;
    padding: 0 20px;
}

.blog-content {
    background: white;
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    line-height: 1.8;
}

.blog-content h2 {
    font-size: 32px;
    font-weight: 900;
    color: #1a202c;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-content h3 {
    font-size: 24px;
    font-weight: 700;
    color: #2d3748;
    margin-top: 30px;
    margin-bottom: 14px;
}

.blog-content h4 {
    font-size: 20px;
    font-weight: 600;
    color: #4a5568;
    margin-top: 22px;
    margin-bottom: 10px;
}

.blog-content p {
    color: #4a5568;
    font-size: 16px;
    margin-bottom: 18px;
    line-height: 1.9;
}

.blog-content a {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
}

.blog-content a:hover {
    text-decoration: underline;
}

.blog-content ul,
.blog-content ol {
    color: #4a5568;
    margin-left: 24px;
    margin-bottom: 18px;
}

.blog-content li {
    margin-bottom: 8px;
    line-height: 1.8;
}

.blog-content strong {
    color: #8b5cf6;
    font-weight: 700;
}

/* Footer */

.footer {
    background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
    color: white;
    padding: 60px 0 20px;
    margin-top: 20px;
}

.footer-column h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #a0aec0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column ul li a {
    color: #cbd5e0;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer-column ul li a:hover {
    color: #14b8a6;
    transform: translateX(5px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 40px;
    padding-top: 30px;
    text-align: center;
    color: #a0aec0;
}

/* Animations */

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

.float-animation {
    animation: float 3s ease-in-out infinite;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */

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

    .result-summary {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    /* Hide desktop nav + dropdown on mobile */
    .nav-links {
        display: none !important;
    }

    .mobile-menu-btn {
        display: block;
    }

    .desktop-center-nav {
        position: static;
        transform: none;
    }
}

    .page-header h1 {
        font-size: 30px;
    }

    .page-header p {
        font-size: 16px;
    }

    .calculator-card {
        padding: 24px;
    }

    .blog-content {
        padding: 24px;
    }

    .blog-content h2 {
        font-size: 26px;
    }

    .blog-content h3 {
        font-size: 20px;
    }

    .download-buttons {
        flex-direction: column;
    }

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

@media (min-width: 769px) {
    .nav-links {
        display: flex;
    }

    .mobile-menu {
        display: none;
    }

    .mobile-menu-btn {
        display: none;
    }
}