:root {
    /* Color Palette - Sober Blue & Green */
    --color-primary: #1B365D; /* Navy Blue */
    --color-primary-light: #2C5282;
    --color-primary-dark: #0F1E36;
    
    --color-accent: #0D9488; /* Teal / Green Accent */
    --color-accent-light: #14B8A6;
    --color-accent-dark: #0F766E;

    --color-text-main: #1E293B; /* Slate 800 */
    --color-text-muted: #475569; /* Slate 600 */
    --color-text-light: #F8FAFC; /* Slate 50 */
    
    --color-bg-body: #F8FAFC;
    --color-bg-white: #FFFFFF;
    --color-bg-gray: #F1F5F9;
    --color-bg-dark: #0F172A;

    --font-family-base: 'Inter', system-ui, -apple-system, sans-serif;
    
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --container-width: 1100px;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family-base);
    color: var(--color-text-main);
    background-color: var(--color-bg-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    color: var(--color-primary-dark);
    margin-bottom: 0.5em;
    font-weight: 700;
}

p {
    margin-bottom: 1rem;
    color: var(--color-text-muted);
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Utilities */
.text-highlight {
    color: var(--color-accent);
}

.icon-accent {
    color: var(--color-accent);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-bg-white);
}

.btn-primary:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-bg-white);
}

.btn-large {
    padding: 0.8rem 1.8rem;
    font-size: 1.1rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-bg-gray);
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary-dark);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-accent);
}

/* Hero Section */
.hero {
    padding: 8rem 0 5rem 0;
    background: linear-gradient(to right bottom, var(--color-bg-white), var(--color-bg-gray));
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-text p {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: flex-end;
}

.image-wrapper {
    position: relative;
    width: 100%;
    max-width: 500px;
}

.image-wrapper img {
    width: 100%;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    object-fit: cover;
    height: 500px;
}

.badge {
    position: absolute;
    bottom: -20px;
    left: -20px;
    background-color: var(--color-bg-white);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    font-weight: 600;
    color: var(--color-accent-dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-left: 4px solid var(--color-accent);
}

/* Standard Sections */
.section {
    padding: 6rem 0;
}

.section-light {
    background-color: var(--color-bg-white);
}

.section-dark {
    background-color: var(--color-primary-dark);
    color: var(--color-text-light);
}

.section-dark h2, .section-dark .subtitle {
    color: var(--color-text-light);
}

.section-dark h4 {
    color: var(--color-bg-white);
}

.section-dark p {
    color: var(--color-text-muted);
}

.section-gray {
    background-color: var(--color-bg-gray);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
}

/* Grids */
.grid {
    display: grid;
    gap: 2rem;
}

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

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

/* Info Cards */
.info-card {
    background-color: var(--color-bg-gray);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    transition: transform var(--transition-medium);
}

.info-card:hover {
    transform: translateY(-5px);
}

.icon-wrapper {
    background-color: var(--color-accent-light);
    color: var(--color-bg-white);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

/* Features */
.feature {
    text-align: center;
    padding: 2rem;
    background-color: rgba(255,255,255,0.05);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255,255,255,0.1);
}

.feature svg {
    color: var(--color-accent);
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
}

/* Comparison */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: stretch;
}

.card {
    background-color: var(--color-bg-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    height: 100%;
}

.card-header {
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--color-bg-white);
}

.card-header h3 {
    color: inherit;
    margin-bottom: 0;
}

.card-benefit .card-header {
    background-color: var(--color-accent);
}

.card-risk .card-header {
    background-color: var(--color-primary-light);
}

.check-list {
    padding: 2rem;
}

.check-list li {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: flex-start;
}

.check-list svg {
    flex-shrink: 0;
    color: var(--color-accent);
    margin-top: 2px;
    min-width: 24px;
    height: 24px;
}

/* Evidence Cards */
.evidence-grid {
    gap: 2rem;
}

.evidence-card {
    background-color: var(--color-bg-white);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    border-top: 4px solid var(--color-primary-light);
    transition: transform var(--transition-medium);
    display: flex;
    flex-direction: column;
}

.evidence-card:hover {
    transform: translateY(-5px);
}

.evidence-highlight {
    border-top-color: var(--color-accent);
}

.evidence-icon {
    width: 50px;
    height: 50px;
    background-color: var(--color-bg-gray);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
}

.evidence-highlight .evidence-icon {
    color: var(--color-accent);
    background-color: rgba(13, 148, 136, 0.1);
}

.evidence-card p {
    flex-grow: 1;
}

.evidence-source {
    display: block;
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--color-accent-dark);
    font-weight: 600;
}

/* Accordion */
.accordion {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.accordion-item {
    background-color: var(--color-bg-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.accordion-header {
    width: 100%;
    text-align: left;
    padding: 1.5rem;
    background: none;
    border: none;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.accordion-header:hover {
    background-color: var(--color-bg-gray);
}

.accordion-header svg {
    transition: transform var(--transition-fast);
}

.accordion-item.active .accordion-header svg {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-medium);
}

.accordion-item.active .accordion-content {
    max-height: 500px; /* arbitrary large value */
}

.accordion-content p {
    padding: 0 1.5rem 1.5rem 1.5rem;
    margin: 0;
}

/* Footer */
.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-muted);
    padding: 4rem 0 2rem 0;
}

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

.footer .logo {
    color: var(--color-bg-white);
    margin-bottom: 1rem;
}

.footer h4 {
    color: var(--color-bg-white);
    margin-bottom: 1.5rem;
}

.footer-links ul li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-disclaimer p {
    font-size: 0.9rem;
    background-color: rgba(255,255,255,0.05);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 3px solid var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 992px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-text h1 {
        font-size: 2.8rem;
    }

    .hero-buttons {
        justify-content: center;
    }
    
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple mobile handling */
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero {
        padding-top: 6rem;
    }
}