@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:wght@400;500;600;700&display=swap');

:root {
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary-color: #64748b;
    --accent-color: #06b6d4;
    --accent-light: #22d3ee;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --light-bg: #fefefe;
    --card-bg: #ffffff;
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --light-text: #1e293b;
    --dark-text: #f8fafc;
    --muted-text: #64748b;
    --border-color: #e2e8f0;
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --box-shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --transition-speed: 0.3s;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #10b981 100%);
    --gradient-bg: linear-gradient(135deg, #fefefe 0%, #f8fafc 50%, #f1f5f9 100%);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--gradient-bg);
    color: var(--light-text);
    transition: all var(--transition-speed) ease;
    line-height: 1.7;
    font-weight: 400;
    min-height: 100vh;
}

body.dark-mode {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    color: var(--dark-text);
}

header {
    background: var(--gradient-primary);
    color: white;
    padding: 3rem 1rem 3rem;
    text-align: center;
    box-shadow: var(--box-shadow-lg);
    position: relative;
    overflow: hidden;
}

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 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    opacity: 0.3;
}

header h1 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    font-size: 3rem;
    margin-bottom: 0.75rem;
    color: white;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3);
    position: relative;
    z-index: 1;
}

header p {
    font-weight: 500;
    color: white;
    margin-bottom: 2rem;
    font-size: 1.1rem;
    position: relative;
    z-index: 1;
    text-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.form-check-input {
    width: 3rem;
    height: 1.5rem;
    background-color: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.form-check-input:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.fas {
    color: white;
    transition: all var(--transition-speed) ease;
}

.form-check:hover .fas {
    color: white;
    transform: scale(1.1);
}

.sticky-top {
    backdrop-filter: saturate(180%) blur(20px);
    background: var(--gradient-primary) !important;
}

body.dark-mode .sticky-top {
    background: var(--gradient-primary) !important;
}

.exporting * {
    animation: none !important;
    transition: none !important;
}
.exporting .sticky-top {
    backdrop-filter: none !important;
}

.nav-tabs {
    border: none;
    gap: 0.5rem;
}

.nav-tabs .nav-link {
    color: rgba(255, 255, 255, 0.8);
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 1rem 2rem;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin: 0.5rem 0.5rem;
    position: relative;
    z-index: 1;
}

.nav-tabs .nav-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.nav-tabs .nav-link.active {
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
    font-weight: 600;
    border-color: rgba(255, 255, 255, 0.3);
}

body.dark-mode .nav-tabs .nav-link.active {
    background: var(--dark-card);
    color: var(--primary-light);
}

.calculator-panel {
    display: none;
    animation: fadeIn 0.6s ease;
}

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

.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    padding: 3rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    margin: 2.5rem 0;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.calculator-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

body.dark-mode .calculator-container {
    background: var(--dark-card);
    border-color: #334155;
}

.input-section h2 {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2.5rem;
    color: var(--primary-color);
    position: relative;
}

.input-section h2::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 0;
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.form-label {
    font-weight: 500;
    color: var(--light-text);
    margin-bottom: 0.75rem;
}

body.dark-mode .form-label {
    color: var(--dark-text);
}

.form-control {
    border-radius: var(--border-radius-sm);
    border: 2px solid var(--border-color);
    padding: 1rem 1.25rem;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    background: white;
    transform: translateY(-1px);
}

body.dark-mode .form-control {
    background: #334155;
    border-color: #475569;
    color: var(--dark-text);
}

.input-group-text {
    background: var(--gradient-primary);
    border: 2px solid var(--primary-color);
    color: white;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    padding: 1rem 1.25rem;
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 1.25rem 2.5rem;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition-speed) ease;
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-lg);
}

.btn-outline-secondary {
    border: 2px solid var(--border-color);
    color: var(--muted-text);
    border-radius: var(--border-radius-sm);
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
}

.btn-outline-secondary:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.results-section {
    animation: slideInUp 0.6s ease;
}

canvas {
    width: 100% !important;
    max-height: 420px;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--box-shadow);
}

.results-highlight {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.highlight-box {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
}

.highlight-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: transform var(--transition-speed) ease;
}

.highlight-box:hover::before {
    transform: scaleX(1);
}

.highlight-box:hover {
    transform: translateY(-6px);
    box-shadow: var(--box-shadow-lg);
}

body.dark-mode .highlight-box {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    border-color: #475569;
}

.highlight-box h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
}

.highlight-box h3.future-value-existing {
    font-size: 0.8rem;
}

.highlight-box p {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
    font-family: 'Inter', sans-serif;
}

.educational-content {
    margin-top: 3rem;
    padding: 2.5rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
    border-radius: var(--border-radius);
    border-left: 5px solid var(--primary-color);
    box-shadow: var(--box-shadow);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(99, 102, 241, 0.1);
}

.educational-content .text-muted {
    color: var(--muted-text) !important;
}

body.dark-mode .educational-content {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

body.dark-mode .educational-content .text-muted {
    color: #94a3b8 !important;
}

/* Enhanced AdSense Placeholder Styles */
.adsense-placeholder {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
    border: 2px dashed rgba(99, 102, 241, 0.3);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    margin: 2.5rem 0;
    color: var(--muted-text);
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.adsense-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.6s ease;
}

.adsense-placeholder:hover::before {
    left: 100%;
}

.adsense-placeholder:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    transform: translateY(-3px);
    box-shadow: var(--box-shadow);
}

body.dark-mode .adsense-placeholder {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    border-color: rgba(129, 140, 248, 0.3);
    color: #94a3b8;
}

body.dark-mode .adsense-placeholder:hover {
    border-color: var(--primary-light);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
}

.adsense-banner {
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 500;
}

.adsense-sidebar {
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    /* Make sidebar ad sticky by default on larger viewports. JS-free sticky behavior. */
    position: -webkit-sticky;
    position: sticky;
    top: 140px;
    font-weight: 500;
}

/* Clean top area when header hero ad is moved */
#header-hero-ad {
    display: none; /* moved to bottom for cleaner top */
}

.content-inline-ad {
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
}

/* Bottom full-width banner (headerHero moved to bottom) */
.bottom-banner-ad {
    width: 100%;
    display: block;
    margin-top: 3rem;
    margin-bottom: 3rem;
}

.adsense-large {
    min-height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 600;
}

.adsense-placeholder .fas {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

body.dark-mode .adsense-placeholder .fas {
    color: var(--primary-light);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

@media (max-width: 992px) {
    .calculator-container {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        padding: 2.5rem;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    header {
        padding: 2.5rem 1rem 2rem;
    }
}

@media (max-width: 576px) {
    .results-highlight {
        grid-template-columns: 1fr;
    }
    
    header {
        padding: 2rem 1rem 1.5rem;
    }
    
    header h1 {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
    
    .calculator-container {
        padding: 2rem;
        margin: 1.5rem 0;
    }
    
    .nav-tabs .nav-link {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }
    
    .input-section h2 {
        font-size: 1.75rem;
    }
}