:root {
    --ink: #111;
    --gray-900: #1a1a1a;
    --gray-800: #2a2a2a;
    --gray-700: #404040;
    --gray-600: #525252;
    --gray-500: #6b6b6b;
    --gray-400: #8a8a8a;
    --gray-300: #d1d1d1;
    --gray-200: #d4d4d4;
    --gray-100: #f5f5f5;
    --white: #fff;
    --accent: #2563eb;
    --accent-light: #eff6ff;
    --accent-strong: #1d4ed8;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Inter", -apple-system, sans-serif;
    background: var(--white);
    color: var(--gray-900);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

.serif {
    font-family: "Newsreader", Georgia, serif;
}

.back-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--gray-100);
}

.back-nav-inner {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-link {
    text-decoration: none;
    color: var(--gray-500);
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--ink);
}

.back-link svg {
    width: 16px;
    height: 16px;
}

.nav-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--ink);
}

.hero {
    padding: 8rem 2rem 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.brand-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 0.45rem 0.75rem;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.brand-chip img {
    display: block;
    width: auto;
    max-width: 120px;
    height: 22px;
    object-fit: contain;
}

.hero-eyebrow-text {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
}

.hero h1 {
    font-family: "Newsreader", serif;
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-weight: 400;
    line-height: 1.15;
    color: var(--ink);
    max-width: 800px;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--gray-600);
    max-width: 620px;
    line-height: 1.7;
    margin-bottom: 3rem;
}

.hero-meta {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--gray-200);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    overflow: hidden;
    max-width: 720px;
}

.hero-meta-item {
    background: var(--white);
    padding: 1.25rem 1.5rem;
}

.hero-meta-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray-400);
    margin-bottom: 0.35rem;
    font-weight: 500;
}

.hero-meta-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--ink);
}

.metrics-banner {
    max-width: 1000px;
    margin: 3rem auto;
    padding: 0 2rem;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.metric-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.metric-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.metric-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent);
    opacity: 0;
    transition: opacity 0.3s;
}

.metric-card:hover::before {
    opacity: 1;
}

.metric-number {
    font-family: "Newsreader", serif;
    font-size: 2.8rem;
    font-weight: 500;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
}

.metric-label {
    font-size: 0.85rem;
    color: var(--gray-600);
    font-weight: 500;
}

.metric-sublabel {
    font-size: 0.75rem;
    color: var(--gray-400);
    margin-top: 0.25rem;
}

.content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 4rem 0;
    border-top: 1px solid var(--gray-200);
}

.section:first-of-type {
    border-top: none;
}

.section-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 4rem;
    align-items: start;
}

.section-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--gray-400);
    font-weight: 600;
    padding-top: 0.35rem;
    position: sticky;
    top: 5rem;
}

.section-body h2 {
    font-family: "Newsreader", serif;
    font-size: 1.6rem;
    font-weight: 400;
    margin-bottom: 1.25rem;
    color: var(--ink);
    letter-spacing: -0.01em;
}

.section-body p {
    color: var(--gray-600);
    margin-bottom: 1.25rem;
    max-width: 600px;
}

.section-body p:last-child {
    margin-bottom: 0;
}

.result-highlight {
    background: var(--accent-light);
    border-left: 3px solid var(--accent);
    padding: 1.25rem 1.5rem;
    border-radius: 0 10px 10px 0;
    margin-top: 1.5rem;
}

.project-image {
    margin: 1.5rem 0;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.project-image img {
    width: 100%;
    display: block;
}

.image-caption {
    font-size: 0.8rem;
    color: var(--gray-400);
    margin-top: 0.5rem;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.case-hero {
    padding-top: 7rem;
    padding-bottom: 3rem;
}

.case-company {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.case-brand {
    display: inline-flex;
    margin-bottom: 1rem;
}

.case-brand .brand-chip img {
    max-width: 150px;
    height: 26px;
}

.case-hero h1 {
    font-family: "Newsreader", serif;
    font-size: 2.5rem;
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: 1rem;
    max-width: 700px;
    color: var(--ink);
}

.case-meta {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.meta-item {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.meta-item strong {
    color: var(--gray-900);
}

.case-metrics {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.case-metrics .metric-box {
    text-align: center;
    padding: 1rem 1.5rem;
    background: var(--accent-light);
    border-radius: 10px;
    min-width: 120px;
}

.case-metrics .metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
}

.case-metrics .metric-label {
    font-size: 0.7rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.case-content {
    padding-bottom: 4rem;
}

.case-section {
    margin-bottom: 3rem;
}

.case-section h2 {
    font-family: "Newsreader", serif;
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: var(--ink);
}

.case-section p {
    color: var(--gray-700);
    margin-bottom: 1rem;
    max-width: 700px;
}

.case-section ul {
    list-style: none;
    padding: 0;
    max-width: 700px;
}

.case-section li {
    font-size: 0.95rem;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    padding-left: 1.25rem;
    position: relative;
}

.case-section li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.case-footer {
    max-width: 1000px;
    margin: 0 auto;
    padding: 4rem 2rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left p {
    color: var(--gray-400);
    font-size: 0.85rem;
}

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

.footer-nav a {
    text-decoration: none;
    color: var(--gray-600);
    font-size: 0.85rem;
    font-weight: 500;
    transition: color 0.2s;
}

.footer-nav a:hover {
    color: var(--ink);
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeUp 0.6s ease forwards;
    opacity: 0;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

@media (max-width: 768px) {
    .hero {
        padding: 6rem 1.5rem 3rem;
    }

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

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

    .section-label {
        position: static;
    }

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

    .case-footer {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .back-nav-inner {
        padding: 0.75rem 1rem;
    }

    .container {
        padding: 0 1rem;
    }

    .hero,
    .content {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .case-hero {
        padding-top: 5.5rem;
        padding-bottom: 2rem;
    }

    .case-hero h1 {
        font-size: 1.5rem;
    }

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