/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-primary);
    font-size: 1rem;
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--color-accent-glow);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
    color: white;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.btn-outline:hover {
    border-color: var(--color-text-primary);
    background-color: var(--color-surface);
}

/* Cards / Expertise */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.expertise-card {
    background-color: var(--color-surface);
    padding: 3rem 2rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.expertise-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.1), transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.expertise-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.1);
}

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

.expertise-number {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: 1rem;
    display: block;
}

.expertise-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    position: relative;
}

.expertise-card p {
    position: relative;
}

/* Projects Grid */
.projects-filter {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 0.5rem 1.5rem;
    border-radius: 30px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
    color: var(--color-text-primary);
    border-color: var(--color-text-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 2.5rem;
}

.project-card {
    cursor: pointer;
    group: hover;
}

.project-img-wrapper {
    overflow: hidden;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    position: relative;
    aspect-ratio: 4/3;
}

.project-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-img-wrapper img {
    transform: scale(1.05);
}

.project-category {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    display: block;
}

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

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Forms */
.contact-form {
    display: grid;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group textarea {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 1rem;
    color: var(--color-text-primary);
    border-radius: 4px;
    font-family: var(--font-primary);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}