:root {
    --color-bg: #f5f3ef;
    --color-text: #2a2a2a;
    --color-text-light: #6a6a6a;
    --color-accent: #8b6f47;
    --color-accent-hover: #6d5637;
    --color-border: #d4cfc7;
    --color-white: #ffffff;
    --font-display: 'Cormorant Garamond', serif;
    --font-body: 'Work Sans', sans-serif;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    font-size: 1.05rem;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
}

.portfolio-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(245, 243, 239, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    animation: slideDown 0.6s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition);
}

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

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

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.hero {
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 8rem 2rem 6rem;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
}

.hero-content {
    max-width: 800px;
    text-align: center;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-light);
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.hero-stats {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 2rem;
    margin-top: 2rem;
}

.big-stat {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 600;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: 0.75rem;
}

.stat-description {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.5;
}

section {
    padding: 6rem 2rem;
}

section:nth-child(even) {
    background-color: var(--color-white);
}

section:nth-child(odd) {
    background-color: var(--color-bg);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 500;
    margin-bottom: 3rem;
    color: var(--color-text);
}

h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 500;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: 2rem;
    margin-top: 3rem;
}

h3 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 1.25rem;
    margin-top: 2rem;
}

h4 {
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 1rem;
    margin-top: 1.5rem;
}

p {
    margin-bottom: 1.5rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

strong {
    font-weight: 600;
    color: var(--color-text);
}

em {
    font-style: italic;
    color: var(--color-text);
}

.citation {
    position: relative;
    top: -0.5em;
    font-size: 0.7em;
    color: var(--color-accent);
    font-weight: 600;
    cursor: help;
    text-decoration: none;
    padding: 0 0.15em;
}

.citation:hover {
    color: var(--color-accent-hover);
}

.chart-placeholder {
    background-color: var(--color-white);
    border: 2px dashed var(--color-border);
    border-radius: 4px;
    padding: 3rem 2rem;
    margin: 2.5rem 0;
    text-align: center;
}

.chart-placeholder .icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    opacity: 0.4;
}

.chart-placeholder h4 {
    color: var(--color-accent);
    margin-bottom: 0.75rem;
    font-family: var(--font-display);
    font-size: 1.5rem;
}

.chart-placeholder p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

.tableau-viz {
    margin: 3rem 0;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.tableau-viz:has(> :not(.chart-placeholder)) .chart-placeholder {
    display: none;
}

.tableau-viz iframe {
    width: 100%;
    border: none;
}

.callout {
    background-color: var(--color-bg);
    border-left: 3px solid var(--color-accent);
    padding: 1.75rem;
    margin: 2rem 0;
    border-radius: 2px;
}

.callout.warning {
    border-left-color: #c2885b;
    background-color: #faf8f5;
}

.callout.info {
    border-left-color: #7a9c9e;
    background-color: #f7f9f9;
}

.callout h4 {
    margin-top: 0;
    color: var(--color-text);
}

.callout p {
    margin-bottom: 0;
}

.callout p:not(:last-child) {
    margin-bottom: 1rem;
}

.recommendation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin: 3rem 0;
}

.recommendation-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    padding: 2.5rem;
    transition: var(--transition);
    position: relative;
}

.recommendation-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
    border-color: var(--color-accent);
}

.recommendation-card h4 {
    color: var(--color-accent);
    margin-top: 0;
    font-family: var(--font-display);
    font-size: 1.5rem;
}

.recommendation-card p {
    color: var(--color-text-light);
    line-height: 1.7;
}

ul, ol {
    margin-left: 1.75rem;
    margin-bottom: 1.5rem;
}

li {
    margin-bottom: 0.75rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

.collapsible-section {
    margin: 3rem 0;
}

.collapsible-toggle {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 2px;
    padding: 1.5rem 2rem;
    width: 100%;
    text-align: left;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-accent);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.collapsible-toggle:hover {
    background-color: var(--color-bg);
    border-color: var(--color-accent);
}

.collapsible-toggle::after {
    content: '▼';
    font-size: 0.9rem;
    transition: transform 0.3s;
    font-family: var(--font-body);
}

.collapsible-toggle.active::after {
    transform: rotate(180deg);
}

.collapsible-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.collapsible-content.active {
    max-height: 6000px;
    transition: max-height 0.5s ease-in;
}

.collapsible-inner {
    padding: 2.5rem 2rem;
    border: 1px solid var(--color-border);
    border-top: none;
    background-color: var(--color-white);
}

.sources-list {
    margin-left: 0;
    list-style: none;
}

.sources-list li {
    margin-bottom: 2rem;
    padding-left: 2.75rem;
    position: relative;
}

.sources-list li::before {
    content: attr(data-number);
    position: absolute;
    left: 0;
    top: 0;
    font-weight: 600;
    color: var(--color-accent);
    font-family: var(--font-display);
    font-size: 1.1rem;
}

.sources-list a {
    color: var(--color-accent);
    text-decoration: none;
    word-wrap: break-word;
    transition: var(--transition);
}

.sources-list a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

footer {
    background-color: var(--color-text);
    color: var(--color-bg);
    padding: 4rem 2rem;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

footer p {
    color: var(--color-bg);
    margin-bottom: 0.75rem;
    opacity: 0.9;
}

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

footer a:hover {
    color: #a88d63;
    text-decoration: underline;
}

@media (max-width: 768px) {
    body {
        font-size: 1rem;
    }

    .nav-container {
        padding: 1rem 1.5rem;
    }

    .nav-links {
        gap: 1.25rem;
    }

    .nav-link {
        font-size: 0.85rem;
    }

    .hero {
        padding: 6rem 1.5rem 4rem;
        min-height: 60vh;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.05rem;
    }

    .big-stat {
        font-size: 2.25rem;
    }

    section {
        padding: 4rem 1.5rem;
    }

    .container {
        padding: 0 1.5rem;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 2rem;
    }

    h2 {
        font-size: 2rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    .recommendation-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .recommendation-card {
        padding: 2rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero {
        padding: 5rem 1rem 3rem;
    }

    .hero-title {
        font-size: 1.85rem;
    }

    .big-stat {
        font-size: 2rem;
    }
}