/* ========================================
   CSS Reset & Base Styles
   ======================================== */

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

:root {
    --color-text: #1a1a1a;
    --color-text-secondary: #666;
    --color-background: #ffffff;
    --color-accent: #0066cc;
    --color-border: #e5e5e5;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --max-width: 1200px;
    --border-radius: 8px;
    --transition-speed: 0.2s;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: opacity var(--transition-speed) ease;
}

a:hover {
    opacity: 0.7;
}

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

/* ========================================
   Navigation
   ======================================== */

.nav {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

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

.logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-speed) ease;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    padding: var(--spacing-xl) 0;
    animation: fadeIn 0.6s ease;
}

.hero-title {
    font-size: clamp(28px, 5vw, 48px);
    line-height: 1.2;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
    max-width: 900px;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    line-height: 1.6;
    color: var(--color-text-secondary);
    max-width: 800px;
}

/* ========================================
   Section Titles
   ======================================== */

.section-title {
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Case Studies Section
   ======================================== */

.case-studies {
    padding: var(--spacing-xl) 0;
}

.case-study {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin-bottom: var(--spacing-xl);
    animation: slideUp 0.6s ease;
}

.case-study:last-child {
    margin-bottom: 0;
}

.case-study-image {
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: transform var(--transition-speed) ease;
}

.case-study-image:hover {
    transform: scale(1.02);
}

.case-study-image img {
    width: 100%;
    height: auto;
}

.case-study-label {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.case-study-title {
    font-size: clamp(20px, 2.5vw, 28px);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-sm);
}

.case-study-meta {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.case-study-link {
    display: inline-flex;
    align-items: center;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-accent);
    transition: transform var(--transition-speed) ease;
}

.case-study-link:hover {
    transform: translateX(4px);
}

/* ========================================
   Design Approach Section
   ======================================== */

.approach {
    padding: var(--spacing-xl) 0;
    background-color: #fafafa;
}

.approach-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.approach-item {
    animation: fadeIn 0.6s ease;
}

.approach-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

.approach-description {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

/* ========================================
   Testimonials Section
   ======================================== */

.testimonials {
    padding: var(--spacing-xl) 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.testimonial {
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    animation: fadeIn 0.6s ease;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    cursor: pointer;
    position: relative;
}

.testimonial:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.read-more {
    display: block;
    margin-top: var(--spacing-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-accent);
    transition: transform var(--transition-speed) ease;
}

.testimonial:hover .read-more {
    transform: translateX(4px);
}

.testimonial-text {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.testimonial-author strong {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
}

.testimonial-author span {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ========================================
   Contact Section
   ======================================== */

.contact {
    padding: var(--spacing-xl) 0;
    background-color: #fafafa;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contact-link {
    font-size: 18px;
    font-weight: 500;
    color: var(--color-accent);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ========================================
   Modal
   ======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: white;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    animation: modalSlideIn 0.3s ease;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 32px;
    line-height: 1;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color var(--transition-speed) ease;
    padding: 0;
    width: 32px;
    height: 32px;
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-testimonial p {
    font-size: 18px;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.modal-testimonial footer {
    font-size: 16px;
    color: var(--color-text-secondary);
    font-style: normal;
}

.modal-testimonial footer strong {
    display: block;
    color: var(--color-text);
    font-size: 17px;
    margin-bottom: 4px;
}

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

/* ========================================
   Animations
   ======================================== */

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .nav-links {
        position: fixed;
        top: 65px;
        right: 0;
        width: 100%;
        background: var(--color-background);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .menu-toggle {
        display: flex;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .case-study {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

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

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

.cs-row {
    display: flex;
    gap: 24px;
}

.cs-row > * {
    flex: 1;
}

@media (max-width: 768px) {
    .cs-row {
        flex-direction: column;
    }
}