:root {
    --bg-color: #0d0d0d;
    --card-bg: #161616;
    --text-color: #f5f5f5;
    --text-muted: #a3a3a3;
    --accent-color: #e0e0e0;
    --border-color: #262626;
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --container-width: 1200px;
    --spacing-xs: 1rem;
    --spacing-sm: 2rem;
    --spacing-md: 4rem;
    --spacing-lg: 8rem;
}

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

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

h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    font-weight: 500;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

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

.subtext {
    font-size: 1.25rem;
    max-width: 600px;
    margin-bottom: 0;
}

.overline {
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
    display: block;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

section {
    padding: var(--spacing-lg) 0;
}

/* Hero */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    min-height: 90vh;
    padding: 0 var(--spacing-sm);
    max-width: 1400px;
    margin: 0 auto;
    gap: var(--spacing-md);
}

.hero-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: var(--spacing-sm);
    border: 2px solid var(--border-color);
}

.hero-visual img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    opacity: 0.9;
}

@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        min-height: auto;
        padding-top: var(--spacing-md);
    }

    .hero-content {
        order: 1;
    }

    .hero-visual {
        order: 2;
    }

    .subtext {
        margin: 0 auto;
    }
}

/* Credibility */
.credibility {
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2.5rem;
    font-family: var(--font-heading);
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

@media (max-width: 600px) {
    .stat-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* Services */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-sm);
}

.service-card {
    background: var(--card-bg);
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: transform 0.2s ease;
}

.service-card:hover {
    transform: translateY(-5px);
    border-color: #404040;
}

/* Case Studies */
.case-study-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    align-items: center;
}

.case-study-card.reverse {
    direction: rtl;
    /* simple way to reverse visual order */
}

.case-study-card.reverse>* {
    direction: ltr;
    /* reset content direction */
}

.case-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: #262626;
    border-radius: 100px;
    font-size: 0.75rem;
    margin-bottom: var(--spacing-xs);
    color: var(--white);
    text-transform: uppercase;
}

.case-visual img {
    width: 100%;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.case-details {
    margin-top: var(--spacing-sm);
    display: grid;
    gap: var(--spacing-sm);
}

.detail-block h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.detail-block p {
    color: var(--text-color);
}

@media (max-width: 768px) {

    .case-study-card,
    .case-study-card.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
        gap: var(--spacing-sm);
    }
}

/* Process */
.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    position: relative;
}

.process-steps::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, var(--border-color) 0%, transparent 100%);
    display: none;
    /* simple design choice */
}

.step {
    padding-top: var(--spacing-sm);
    position: relative;
}

.step-number {
    font-size: 3rem;
    font-weight: 700;
    color: #1a1a1a;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.step h4 {
    margin-bottom: 0.5rem;
}

@media (max-width: 600px) {
    .process-steps {
        grid-template-columns: 1fr;
    }

    .step-number {
        font-size: 2rem;
    }
}

/* Tech Stack */
.tech-stack {
    background: #111;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
}

.tech-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.tech-grid span {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Feedback */
.feedback-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.feedback-card {
    background: var(--card-bg);
    padding: var(--spacing-sm);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.feedback-card p {
    font-size: 1.125rem;
    font-style: italic;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.client-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
}

@media (max-width: 600px) {
    .feedback-grid {
        grid-template-columns: 1fr;
    }
}

/* Footer */
footer {
    padding: var(--spacing-md) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-muted);
    font-size: 0.875rem;
}